@article {Ahmed2024DualBandWLANMIMO,
	title = {Dual-Band WLAN MIMO Antennas},
	journal = {Wireless Personal Communications},
	volume = {138},
	number = {2},
	year = {2024},
	month = {Oct},
	pages = {2489{\textendash}2521},
	publisher = {Springer Nature},
	doi = {10.1007/s11277-024-11611-4},
	url = {https://doi.org/10.1007/s11277-024-11611-4},
	author = {Bazil Taha Ahmed}
}
@article {PhysRevApplied.19.044014,
	title = {Diffraction Phenomena in Time-Varying Metal-Based Metasurfaces},
	journal = {Phys. Rev. Appl.},
	volume = {19},
	year = {2023},
	month = {Apr},
	pages = {044014},
	publisher = {American Physical Society},
	doi = {10.1103/PhysRevApplied.19.044014},
	url = {https://link.aps.org/doi/10.1103/PhysRevApplied.19.044014},
	author = {Alex-Amor, Antonio and Moreno-Rodr{\'\i}guez, Salvador and Padilla, Pablo and Valenzuela-Vald{\'e}s, Juan F. and Molero, Carlos}
}
@article {20_EDUARDO_MONOPULSE_DIFUSSION,
	title = {Diffusion-bonded W-band monopulse array antenna for space debris radar},
	journal = {AEU - International Journal of Electronics and Communications},
	volume = {116},
	year = {2020},
	pages = {153061},
	abstract = {In this letter, the design and fabrication of a W-band high-gain monopulse array antenna are presented. The antenna is conceived as a proof of concept for a space debris detection project to develop an on-board radar for a satellite system. The antenna array consists of 16 by 16 circularly polarized radiating cavities fed by a corporate waveguide network with an amplitude taper. An underlying monopulse beamforming network is implemented in waveguide technology as well, providing monopulse capability in both main radiating planes. By means of diffusion bonding, the antenna has been fabricated in a single piece, despite its intricate, multilayer topology. Moreover, the experimental performance shows high agreement with simulations, which is remarkable due to the high sensitivity to manufacturing tolerances at this frequency. Over a 10\% bandwidth is experimentally achieved for efficiency over a 75\%, axial ratio under 3~dB and impedance matching under -10~dB.},
	keywords = {millimeter wave technology, Planar arrays, radar antennas},
	issn = {1434-8411},
	doi = {https://doi.org/10.1016/j.aeue.2019.153061},
	url = {http://www.sciencedirect.com/science/article/pii/S1434841119320436},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@article {20_EDU_PABLO_ARRAY_GUIA_CUADRADA,
	title = {Dual Circularly Polarized Array Antenna based on Corporate Feeding Network in Square Waveguide Technology},
	journal = {IEEE Transactions on Antennas and Propagation},
	year = {2020},
	pages = {1-1},
	keywords = {Antenna arrays, omnidirectional antennas, Slot antennas},
	issn = {1558-2221},
	doi = {10.1109/TAP.2020.3019355},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares and J A Ruiz-Cruz}
}
@conference {20_EUCAP2020_ARRAY_DUAL_BOWTIE_EDUARDO,
	title = {Dual Circularly Polarized Waveguide Array Antenna Formed by Full-Metallic Bow-tie Radiating Cavities},
	booktitle = {2020 14th European Conference on Antennas and Propagation (EuCAP)},
	year = {2020},
	month = {March},
	pages = {1-5},
	abstract = {A full-metallic dual circularly polarized antenna based on an array of bow-tie shaped radiating elements is presented in this contribution. The radiating element, formed by a bow-tie shaped cavity, can generate dual circular polarization. It is fed by a square waveguide path that supports the two degenerate modes TE10 and TE01. The excitation of the TE10 mode in the input port generates left-hand circular polarization while the TE01 mode generates right-hand circular polarization. Furthermore, a dual circularly polarized array antenna formed by bow-tie radiating elements has been designed. The two degenerate modes TE10 and TE01 are supported by a four-way feeding network implemented in square waveguide technology. Both the single radiating element and the dual circularly polarized array have been fabricated by CNC milling techniques. A pure circular polarization performance, high gain or high efficiency have been obtained, experimentally validating the dual circularly polarized bow-tie element in an array configuration.},
	keywords = {antenna diversity, Aperture antennas, Dual-polarized antennas, waveguide arrays},
	doi = {10.23919/EuCAP48036.2020.9135228},
	author = {E Garcia-Marin and P Sanchez-Olivares and J L Masa-Campos and J A Ruiz-Cruz and J Herranz-Alpanseque}
}
@article {20_ANTENA_ARRAY_DUAL_SLOT_BOMBARDERO_KUMAR,
	title = {Dual-linearly polarized travelling-wave array antenna based on triple plus slots fed by square waveguide},
	journal = {AEU - International Journal of Electronics and Communications},
	volume = {119},
	year = {2020},
	pages = {153176},
	abstract = {A dual-linearly polarized travelling-wave array antenna design at Ku-band composed by a novel single element named as triple plus slot is presented. It is formed by a plus slot with an additional pair of short auxiliary slots. The generation of the dual polarization is based on the two degenerated modes TE10 and TE01 supported by a square waveguide following a series feeding topology. Following the operation principle of the conventional plus slot, the transversal slot is only excited by the TE10 mode to generate vertical polarization while the longitudinal slot is only excited by the TE01 mode to generate horizontal polarization. The auxiliary slots provide new degrees of freedom to the antenna design process that allow to accomplish some strict requirements and overcome some design issues. Thus, the proposed triple plus slot has been experimentally validated in a dual-linearly polarized travelling-wave array configuration. The antenna has been fabricated and measured, providing some features such as high efficiency (>80\%), high gain (>13~dB) with a 1~dB-gain bandwidth higher than 10\%, grating lobe mitigation, high isolation between orthogonal polarizations (>25~dB) as well as a fractional impedance bandwidth (S11~<~-14~dB) higher than 11.7\% (from 16 to 18~GHz).},
	keywords = {Antenna arrays, Dual-polarized antennas, Slot antennas},
	issn = {1434-8411},
	doi = {https://doi.org/10.1016/j.aeue.2020.153176},
	url = {http://www.sciencedirect.com/science/article/pii/S1434841119332042},
	author = {P Sanchez-Olivares and J L Masa-Campos and E Garcia-Marin and D Barrio-Tejedor and P Kumar}
}
@conference {19_URSI_EDUARDO_MONOPULSO_DIF_BONDING,
	title = {Diffusion-bonded circularly polarized W-band monopulse array antenna},
	booktitle = {Simposium Nacional URSI 2019},
	year = {2019},
	month = {September},
	abstract = {A W-band circularly polarized antenna array with monopulse capability has been designed and fabricated by diffusion bonding of copper plates. The antenna is presented as a proof of concept for a space debris radar project. A waveguide monopulse beamforming network provides monopulse operation in the two main radiation planes. The feeding network is implemented in waveguide technology as well, with corporate topology and amplitude tapering to ensure adequate radiation patterns for the monopulse system. Circular polarization is straightforwardly achieved by hexagonal-shaped radiating cavities. Experimental results validate diffusion bonding for complex multilayer antenna fabrication at W-band, providing a bandwidth over 10\% for axial ratio under 3 dB, impedance matching under -10 dB and total efficiency over 75\%.},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {19_EUCAP_PABLO_ANTENA_BOMBARDERO,
	title = {Dual Polarized Travelling-Wave Array Antenna Formed by Printed Cross Slots},
	booktitle = {2019 13th European Conference on Antennas and Propagation (EuCAP)},
	year = {2019},
	month = {March},
	pages = {1-5},
	keywords = {Antenna arrays, Antenna measurements, Arrayed waveguide gratings, Couplings, dual linear polarization, dual polarization, dual polarized array antenna, dual polarized travelling-wave array antenna, electromagnetic wave polarisation, linear antenna arrays, linear orthogonal polarizations, longitudinal slots, microstrip antenna arrays, mutual coupling effects, printed cross slots, rectangular waveguides, slot antenna arrays, Slot antennas, square waveguide feeding, transversal slots},
	issn = {null},
	url = {https://ieeexplore.ieee.org/document/8740194},
	author = {P Sanchez-Olivares and J L Masa-Campos and P Kumar and E Garcia-Marin}
}
@article {18_COMM_MAG_EDUARDO_DIFF_BONDING1,
	title = {Diffusion Bonding Manufacturing of High Gain W-Band Antennas for 5G Applications},
	journal = {IEEE Communications Magazine},
	volume = {56},
	number = {7},
	year = {2018},
	month = {July},
	pages = {21-27},
	abstract = {The incoming 5G systems propose unprecedented communication capabilities that require a maximization of the channel and spectrum exploitation. Waveguide antenna arrays can play an important role in 5G environments due to their high performance in terms of efficiency and bandwidth. Moreover, higher frequencies appear necessary in order to achieve the requirements of channel capacity and spectrum bandwidth. At millimeter-wave frequencies, new challenges for the design and fabrication of the communication devices are encountered. The feasibility of traditional manufacturing techniques and conventional additive manufacturing processes severely decreases, since part tolerances, assembly, and alignment become critical for the antenna performance. In order to illustrate the possibilities of the diffusion bonding technique applied to waveguide antennas operating in the W-band of 5G systems, a circularly polarized cavity array has been successfully manufactured. This manufacturing process provides the advantages of both traditional and additive manufacturing. A 5.6 percent effective bandwidth at 90 GHz has been experimentally obtained with reflected power under 10 percent, axial ratio below 3 dB, and antenna efficiency over 50 percent.},
	keywords = {5G mobile communication, Antenna arrays, Diffusion bonding, Three-dimensional printing},
	issn = {0163-6804},
	doi = {10.1109/MCOM.2018.1700986},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {17_URSI_EDUARDO-GARCIA_diffusionbonding_antenna,
	title = {Diffusion-bonded Circularly Polarized Corporate-Fed Cavity Array for W-band},
	booktitle = {Simposium Nacional URSI 2017},
	year = {2017},
	month = {September},
	abstract = {A circularly polarized radiating cavity array has been designed at 94 GHz and manufactured by the innovative technique of diffusion bonding of thin metallic layers, introduced to the European research community for the first time. The array is composed of 16x16 radiating elements, fed by a two-level waveguide corporate feeding network with uniform distribution. A 5.5 \% bandwidth has been experimentally achieved with matching under -10 dB and axial ratio below 3 dB. At 90 GHz, 30.6 dBi gain and 0.4 dB axial ratio have been measured. The experimental results are considered successful and further improvements in the manufacturing process are expected to refine the performance of the antenna in future prototypes.},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {moran2017direct,
	title = {Direct computation of parabolic waveguide modes via a bivariate root-finding algorithm},
	booktitle = {Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO), 2017 IEEE MTT-S International Conference on},
	year = {2017},
	pages = {152{\textendash}154},
	publisher = {IEEE},
	organization = {IEEE},
	author = {Mor{\'a}n-L{\'o}pez, Ana and J C{\'o}rcoles and Ruiz-Cruz, Jorge A and Montejo-Garai, Jos{\'e} R and Rebollar, Jes{\'u}s M}
}
@conference {Moran-Lopez20171192,
	title = {Dual-mode filters in equilateral triangular waveguides with wide spurious-free response},
	booktitle = {IEEE MTT-S International Microwave Symposium Digest},
	year = {2017},
	note = {cited By 4},
	pages = {1192-1195},
	doi = {10.1109/MWSYM.2017.8058816},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032469925\&doi=10.1109\%2fMWSYM.2017.8058816\&partnerID=40\&md5=9a25dd6727f443bd4d44ecf5bed76d99},
	author = {Mor{\'a}n-L{\'o}pez, A. and J C{\'o}rcoles and Ruiz-Cruz, J.A. and Montejo-Garai, J.R. and Rebollar, J.M.}
}
@conference {16_URSI_RAUL-HARO_radial_divider,
	title = {Desarrollo de Redes Divisoras de Potencia con N-puertos},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {Power division/combination is a very important function for achieving high-performance power amplification in microwave and millimeter-wave systems. This function allows the use of simpler individual amplifiers to provide microwave/millimeter wave high power signals. In this paper we address the development of divider/combiners in waveguide technology for large number of ports. Radial waveguide dividers will be studied, starting from the S-parameters representing the N-port waveguide junction, and ending with the full-wave simulations. Two different designs in this technology are studied, radial divider and conical radial divider. The experimental evaluation will come from a prototype at Ku-band, fabricated and tested in order to validate the design.},
	author = {R V Haro-Baez and J L Masa-Campos and J A Ruiz Cruz and P Sanchez-Olivares and E V Carrera}
}
@conference {16_URSI_JESUS-RUBIO_dao_slotted_array,
	title = {Dise{\~n}o Automatizado por Ordenador de una Agrupaci{\'o}n de Ranuras con Alimentaci{\'o}n en Gu{\'\i}a de Onda},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {A Computer Automated Design method based on the generalized-scattering matrix and spherical wave expansion analysis is used to configure a linearly polarized 24-element slotted array antenna at Ku band. The mutual coupling effects between slots have been considered in the proposed methodology. Therefore, it is possible to remove the typical compensation step in the design process. The computing costs of the whole antenna optimization process is significantly reduced using the proposed method compared to the commercial full-wave simulation tools. An antenna prototype has been manufactured in order to experimentally validate the antenna performance. A realized gain and efficiency values of 15.9 dB and 97\% have been measured at the design frequency (17 GHz), respectively.},
	author = {J C{\'o}rcoles and P Sanchez-Olivares and J Rubio and J L Masa-Campos and J. Zapata}
}
@conference {16_URSI_ANA-MORAN_comblineS,
	title = {Dise{\~n}o de un filtro combline en banda S por subdivisi{\'o}n y optimizaci{\'o}n en etapas},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {Microwave filter design can be done using different approaches. These types of filters are typically found in the frontend of high-frequency transceivers of very diverse systems such as radar, satellite TV or microwave links. This paper addresses the strategy of subdividing the design process of a combline filter into minor stages, each of which takes into account less degrees of freedom (i.e. parameters of design) than in a direct global design. This work evidences how optimization divided into simpler stages becomes an excellent approach to accomplish this task, making it possible to achieve the level of refinement that the physical design parameters require to reach the desired partial responses.},
	author = {A Mor{\'a}n-L{\'o}pez and J A Ruiz-Cruz}
}
@article {16_AE_JL_PRADEEP_DUAL_UWB,
	title = {Dual Polarized Monopole Patch Antennas for UWB Applications with Elimination of WLAN Signals},
	journal = {Advanced Electromagnetic},
	volume = {5},
	year = {2016},
	pages = {46-52},
	abstract = {This paper presents the design, fabrication and measurement of dual polarized microstrip patch antennas for ultra wideband (UWB) applications with notch at 5-6 GHz band. The proposed antenna rejects the wireless local area network (WLAN) signals and work properly in the entire remaining ultra-wideband. Two antennas are designed for two different frequency bands of ultra wideband and both antennas together produce the entire ultra wideband with notch at 5-6 GHz band. The antennas are fed by a 50 {\textohm} coaxial probe and the entire design is optimized using CST Microwave Studio. The bandwidth of 3.1-5 GHz is achieved by the optimized design of Antenna-1 and the bandwidth of 6 -10.6 GHz is achieved by the optimized design of Antenna-2. The bandwidth of the optimized combined antenna is 3.1-10.6 GHz with elimination of the 5-6 GHz band. Both antennas are simulated, developed and measured. The simulated and measured results are presented. The two designed dual polarized antennas i.e. Antenna-1 and Antenna-2 can be used for 3.1-5 GHz band and 6-10.6 GHz band dual polarized applications, respectively, and the combined antenna structure can be used for UWB dual polarized applications with elimination of 5-6 GHz band signals.},
	keywords = {Antennas, UWB, WLAN},
	issn = {2119-0275},
	doi = {10.7716/aem.v5i1.305},
	url = {http://www.aemjournal.org/index.php/AEM/article/view/305},
	author = {P Kumar and J L Masa-Campos}
}
@conference {15_URSI_JORGE_INVITADA,
	title = {Desarrollo de componentes pasivos con divisi{\'o}n/combinaci{\'o}n de potencia para sistemas de comunicaciones},
	booktitle = {Simposium Nacional URSI 2015},
	year = {2015},
	month = {September},
	abstract = {This paper addresses the development of passive devices for communication systems working at the microwave frequency band, but also at millimeter-wave and terahertz frequencies. A brief review of different types of passive devices that the authors have been developed for different applications will be made. The paper will be focused on the devices for the last stage of the transmitter/receiver chain in communications systems, where the antennas and other components such as filters, multiplexers, polarizers, dividers/combiners, etc are an essential part. The application of these devices to power combination techniques will be also outlined, which can be used in high-power amplification, but also in other problems as antenna arrays.},
	author = {B Taha-Ahmed and J C{\'o}rcoles-Ortega and R V Haro-Baez and C A Leal-Sevillano and J L Masa-Campos and J R Montejo-Garai and E Garcia-Marin and A Mor{\'a}n-L{\'o}pez and L Polo-Lopez and J M Rebollar-Machain and J A Ruiz-Cruz and P Sanchez-Olivares}
}
@conference {15_APCASE_RAULHARO_divradial,
	title = {Development of Radial Waveguide Dividers with Large Number of Ports},
	booktitle = {Computer Aided System Engineering (APCASE), 2015 Asia-Pacific Conference on},
	year = {2015},
	month = {July},
	pages = {58-62},
	abstract = {Power division/combination is a very important function for achieving high-performance power amplification in microwave and millimeter-wave systems, allowing the use of simpler individual amplifiers to provide microwave/millimeter wave high power signals. In this paper we address the development of divider/combiners in waveguide technology for large number of ports. Radial waveguide dividers will be studied, starting from the S-parameters representing the N-port waveguide junction, and ending with the full-wave simulations. Two different designs in this technology are studied. The experimental evaluation will come from a prototype at Ku-band, fabricated and tested in order to validate the design.},
	keywords = {antenna, array, corporate feed, linear polarization., SIW, stacked patch},
	author = {R V Haro-Baez and J L Masa-Campos and J A Ruiz-Cruz and P Sanchez-Olivares and E V Carrera}
}
@article {14_IET_SERGIO-CASAS_rwpatcharray,
	title = {Design and characterisation model for a linearly polarised patch array fed by serial rectangular waveguide network},
	journal = {IET Microwaves, Antennas \& Propagation},
	volume = {8},
	number = {14},
	year = {2014},
	month = {November},
	pages = {1204-1210},
	abstract = {A novel method for considering radiating structures independently to their feeding networks is presented. The integration of both parts separately designed suffers a critical misalignment with the theoretical behaviour caused by the mutual coupling effects between adjacent elements. This method analyses radiated near E-field monitors to adjust the whole antenna after joining both independently designed parts. A linearly polarised patch array fed by a rectangular waveguide with internal coupling patches for X band (11{\textendash}12 GHz) has been designed to validate the method performance. A double stacked microstrip patch structure with an integrated phase compensation microstrip line has been used as radiating element. The coupling patches inside the waveguide are connected to the external radiating patches by means of metallic probes. The presented method requires changes in the feeding structure as in the radiating elements. Several prototypes have been manufactured and measured: the feeding waveguide structure connectorised, the radiating patches connectorised, the union of both with SMA transitions and the final integration into the complete antenna. 18.5 dBi gain and 85\% efficiency peak values, as well as 6\% usable bandwidth have been experimentally achieved.},
	issn = {1751-8725},
	doi = {10.1049/iet-map.2013.0379},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6955144},
	author = {S Casas-Olmedo and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {14_URSI_SERGIO-CASAS_rwpatcharray,
	title = {Design Method of Linear Patch Arrays Fed by Waveguide Feeding Networks},
	booktitle = {Simposium Nacional URSI 2014},
	year = {2014},
	month = {September},
	abstract = {A novel method for considering radiating structures independently to their feeding networks is presented. The integration of both parts separately designed suffers a critical misalignment with the theoretical behavior caused by the mutual coupling effects between adjacent elements. This method analyses radiated near E-field monitors to adjust the whole antenna after joining both independently designed parts. A Linearly Polarized Patch Array fed by a Rectangular Waveguide with internal coupling patches for X band (11 GHz - 12 GHz) has been designed to validate the method performance. A double stacked microstrip patch structure with an integrated phase compensation microstrip line has been used as radiating element. The coupling patches inside the waveguide are connected to the external radiating patches by means of metallic probes. The presented method requires changes in the feeding structure as in the radiating elements. Several prototypes have been manufactured and measured: the feeding waveguide structure connectorized, the radiating patches connectorized, the union of both with SMA transitions, and the final integration into the complete antenna. 18.5 dBi gain and 85\% efficiency peak values have been experimentally achieved.},
	author = {S Casas-Olmedo and J L Masa-Campos and P Sanchez-Olivares}
}
@article {26_UWB_Pradeep_MOTL,
	title = {Dual polarized microstrip patch antennas for ultra-wideband applications},
	journal = {Microwave and Optical Technology Letters},
	volume = {56},
	number = {9},
	year = {2014},
	month = {Sep.},
	pages = {2174 - 2179},
	abstract = {This article presents a novel design of dual polarized microstrip patch antennas for ultra-wideband (UWB) applications. Two antennas are designed for different frequency band of UWB. Both antennas are loaded together and the combined antenna is designed for the entire UWB. The designed antenna is optimized using CST Microwave Studio simulator. The antennas are fed by a 50-? coaxial probe. Both antennas are fabricated and measurement of return loss and radiation pattern is performed. The VSWR 2:1 bandwidth of individual designed Antenna I and Antenna II is 3.1{\textendash}5.2 GHz and 4.9{\textendash}11.5 GHz, respectively. The comparison between simulated results and measured results shows good agreement},
	keywords = {dual polarization, microstrip antenna, reflection coefficient, ultra wideband},
	issn = {0895-2477},
	doi = {10.1002/mop.28504},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.28504/pdf},
	author = {P Kumar and J L Masa-Campos}
}
@conference {13_CSTUGM_Montejo-GaraiRuiz-CruzLeal-SevillanoEtAl_DesignofDual-PolarizationDiplexers,
	title = {Design of Dual-Polarization Diplexers Based on Enhanced Turnstile Junctions},
	booktitle = {2013 CST European User Group Meetings},
	year = {2013},
	month = {May},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and C A Leal-Sevillano and Rebollar, J M}
}
@conference {13_Montejo-GaraiRuiz-CruzLeal-SevillanoEtAl_DesignofDual-PolarizationwithFreqDsicrimi,
	title = {Design of Dual-Polarization Waveguide Devices with Frequency Discrimination},
	booktitle = {2013 IEEE MTT-S International Microwave Symposium Digest},
	year = {2013},
	month = {June},
	pages = {1-4},
	abstract = {The goal of this workshop is to introduce the main topologies for devices handling both the frequency discrimination and dual-polarization at the same time. The particular issues that have to be taken into account when addressing the dual-polarization operation along with frequency discrimination in waveguide components will be studied. Antenna feeders with simultaneous linear or circular polarization working at frequency bands with very large separation will be discussed.},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and C A Leal-Sevillano and Rebollar, J M}
}
@conference {13_EuMC_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_Dual-BandBi-PhasePolarizerNonOMT,
	title = {Dual-Band Bi-Phase Waveguide Polarizer for a Novel Feeder Network without Orthomode Transducer},
	booktitle = {Proc. 43rd European Microwave Conference},
	year = {2013},
	issn = {978-1-61284-235-6},
	author = {C A Leal-Sevillano and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {12_URSIUSA_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_DesignFiltersWband,
	title = {Design of waveguide filters at W-band by means of machining techniques},
	booktitle = {Proc. 2012 USNC/URSI National Radio Science Meeting},
	year = {2012},
	month = {July},
	pages = {1},
	abstract = {A common part of many microwave systems is the routing of the signal between the circuit devices performing the different functions of the system (frequency discrimination, power combining, frequency conversion, signal amplifying {\^a}{\texteuro}{\textbrokenbar}). The optimum configuration of these individual devices may lead to a system layout where the interfaces of the different blocks are not aligned or even are in different planes. Thus, the routing network must have waveguide transformers, bends, and twists to be able to accommodate the signal between the different blocks. These elements have a simple function, although a careful design may be required for broadband applications. Moreover, in satellite communications, mass and volume must be kept to a minimum and compactness is highly pursued. A possible solution in these cases is to integrate some of these functions in the routing network elements or even in the input/output of the components. In this work, several waveguide devices will be shown with integrated compact elements for waveguide matching and polarization rotation. Since different functions are integrated in the same device, transitions are avoided and the total length is reduced. Very compact structures for waveguide twists have been developed in Asao et al., "A compact 90-degree twist using novel ridged waveguide for integrated waveguide subsystems," Proc. 36th EuMC, 2006 and Kirilienko et al. {\^a}{\texteuro}{\oe}Compact 90{\^A}{\textordmasculine} Twist formed by a Double-Corner-cut Square Waveguide Section{\^a}{\texteuro}, IEEE TMTT, 2008). Other structures used here will be based on Ruiz-Cruz et al., {\^a}{\texteuro}{\oe}Multi-Section Bow-Tie Steps for Full-Band Waveguide Polarization Rotation{\^a}{\texteuro}, IEEE MWCL, July 2010. The design and evaluation of the different components will be addressed in the presentation, with devices in mixed E/H plane configuration, bends and transformers. When integrating different functions in the same device, some undesired resonances may appear in the structure. Therefore, accurate CAD tools are required for simulating the response and taking into account the mode excitations inside the structure. A precise fabrication is required for having good experimental results, which will be shown in the presentation.},
	author = {C A Leal-Sevillano and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {12_URSIESP_Leal-SevillanoMontejo-GaraiMaolongEtAl_DisenoWFilterSU8,
	title = {Dise{\~n}o de un Filtro de Respuesta El{\'\i}ptica en Banda W Fabricado Mediante la Tecnolog{\'\i}a de Foto Resina SU-8},
	booktitle = {Proc. 2012 Simposium Nacional URSI (in Spanish)},
	year = {2012},
	month = {Sept.},
	pages = {1-4},
	abstract = {Waveguide polarizers are essential devices in feeders for radio transmission systems with circular polarization. In this paper two different dual-band polarizers are designed and compared. The structure of both polarizers is based on the classical corrugated rectangular waveguide. This structure can be analyzed very efficiently like an H-plane and an E-plane problem. The Mode-Matching technique, in combination with global search algorithms, is used for the full-wave analysis and optimization of the polarizers. In the first polarizer, the height of the corrugations is designed according to a taper-type shape. For the second polarizer, no restrictions in the height of the corrugations are imposed and all the dimensions are optimized. The performance of both polarizers is compared, showing certain improvement in terms of polarization purity for the second one.},
	author = {C A Leal-Sevillano and Montejo-Garai, J R and Ke Maolong and Lancaster, M. J and J A Ruiz-Cruz and Rebollar, J M}
}
@conference {12_IMS_Ruiz-CruzFahmiMansour_Dual-ResonanceComblineResonator,
	title = {Dual-Resonance Combline Resonator for Dual-Band Filters},
	booktitle = {2009 IEEE MTT-S International Microwave Symposium Digest},
	year = {2012},
	month = {June},
	pages = {1-3},
	abstract = {A novel combline resonator is introduced in this paper for realizing compact microwave dual-band filters. The basic resonator is based on the well-known combline topology, where an additional metallic conductor is introduced for having two TEM modes. The resonant frequencies of the two asynchronous TEM resonant modes are controlled by the length of the two concentric conductors and their spacing. The proposed structure is employed to realize a dual-band filter, where each combline resonator provides one resonant mode per pass-band. The control of the filter parameters, such as pass-band bandwidths and band separation, is addressed. These filters harness the advantages of combline technology for dual-band filters, using the compactness provided by the proposed resonator. A complete design is introduced. Simulations as well as experimental results are presented showing excellent agreement, thus validating the proposed concept.},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2012.6259436},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6259436},
	author = {J A Ruiz-Cruz and Fahmi, M M and Mansour, R R}
}
@conference {11_EIEC_Montejo-GaraiLeal-SevillanoRuiz-CruzEtAl_DesignofContiguous-BandOMUX,
	title = {Design of Contiguous-Band Elliptic-Response Manifold Output Multiplexers by Efficient Cancellation of Reactive Impedance Parts},
	booktitle = {Proc. VIII Encuentro Ib{\'e}rico de Electromagnetismo Computacional (in Spanish)},
	year = {2011},
	month = {Nov.},
	pages = {1},
	abstract = {In recent years, there has been an increasing demand for satellite communication channels with a complex response, motivated by a most effective use of the radiofrequency spectrum. This means that more channels have to be combined in the output multiplexer (OMUX) after power amplification. In this paper, a synthesis technique based on the Cauer ladder development has been developed to design the singly terminated filters for manifold multiplexers. A procedure for the synthesis and design of contiguous band manifold output multiplexers based on singly terminated filters with elliptic response is considered. The zero shifting technique leads to the synthesis of a driving{\^a}{\texteuro}{\textquotedblleft}point impedance including transmission zeros at finite real frequencies. The synthesized canonical forms have different topologies, number of reactive constant elements and reactive part of the driving impedances with different frequency responses. These characteristics have been intensively analyzed to find the most suitable combination in the multiplexing process to match the channels to the manifold. Using the methodology presented in this work a four-channel multiplexer for Ku-band operation has been designed, manufactured and measured. The input{\^a}{\texteuro}{\textquotedblleft}output ports are standard WR75. The prototype has been manufactured in brass using low-cost milling technique and is formed in one block where all the cavities and irises have the same height. The unloaded Q for the brass cavities is 2500 and therefore the expected insertion losses at central frequency of the higher channel are approximately 2.5 dB. The final paper will show a comparison between the full-wave simulation using the mode-matching method (including losses) and the measurements of the input reflection coefficient and the transmission of the manufactured multiplexer.},
	author = {Montejo-Garai, J R and C A Leal-Sevillano and J A Ruiz-Cruz and Rebollar, J M and Rogla, L and Sobrino, S}
}
@conference {11_URSIESP_Montejo-GaraiLeal-SevillanoRuiz-CruzEtAl_DisenoOMUXCancelacion,
	title = {Dise{\~n}o de Multiplexores Manifold de Salida y Banda Contigua con Respuesta El{\'\i}ptica Mediante la Cancelaci{\'o}n Eficiente de la Parte Reactiva de la Impedancia},
	booktitle = {Proc. 2011 Simposium Nacional URSI (in Spanish)},
	year = {2011},
	month = {Sept.},
	pages = {1-4},
	abstract = {A procedure for the synthesis and design of contiguous band manifold output multiplexers based on singly terminated filters with elliptic response is presented. The zero-shifting technique leads to the synthesis of a driving-point impedance including transmission zeros at finite real frequencies. The synthesized canonical forms have different topologies, number of reactive constant elements and reactive part of the driving impedances with different frequency responses. These characteristics have been intensively analyzed to find the most suitable combination in the multiplexing process to match the channels to the manifold. A Ku-band four-channel elliptic-response multiplexer has been designed in H-plane rectangular waveguide, manufactured and measured in order to show the proposed approach.},
	author = {Montejo-Garai, J R and C A Leal-Sevillano and J A Ruiz-Cruz and Rebollar, J M and Rogla, L and Sobrino, S}
}
@conference {11_URSIESP_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_DisenoyOptimizacionPolariz,
	title = {Dise{\~n}o y Optimizaci{\'o}nn de Polarizadores Doble-Banda en Gu{\'\i}a Rectangular Corrugada},
	booktitle = {Proc. 2011 Simposium Nacional URSI (in Spanish)},
	year = {2011},
	month = {Sept.},
	pages = {1-4},
	abstract = {Waveguide polarizers are essential devices in feeders for radio transmission systems with circular polarization. In this paper two different dual-band polarizers are designed and compared. The structure of both polarizers is based on the classical corrugated rectangular waveguide. This structure can be analyzed very efficiently like an H-plane and an E-plane problem. The Mode-Matching technique, in combination with global search algorithms, is used for the full-wave analysis and optimization of the polarizers. In the first polarizer, the height of the corrugations is designed according to a taper-type shape. For the second polarizer, no restrictions in the height of the corrugations are imposed and all the dimensions are optimized. The performance of both polarizers is compared, showing certain improvement in terms of polarization purity for the second one.},
	author = {C A Leal-Sevillano and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {10_URSIUSA_Ruiz-CruzMontejo-GaraiRebollarEtAl_DesignandEvaluation,
	title = {Design and Evaluation of a Ka-band Antenna Feeder with Broadband Dual-Polarization Performance},
	booktitle = {Proc. 2010 USNC/URSI National Radio Science Meeting},
	year = {2010},
	month = {July},
	pages = {14},
	abstract = {New telecommunication satellite services have increased the demand on antenna feed systems with more stringent requirements in both the electrical and mechanical parts. In fact, one of the main goals for RF hardware onboard spacecrafts is the reduction of size and volume, at the expense of more complex design of the components. Thus, the use of a single antenna for several frequency bands is very common and the antenna feeder has to separate (or to combine, depending on the transmission/reception scheme) the different signals involved in the system. The frequency separation is carried out with multiplexers. Moreover, in many systems, dual polarization is used in order to have a more efficient use of the electromagnetic spectrum, using ortho-mode transducers (OMTs) for the polarization discrimination. In a very common scheme, the OMTs are attached by the common port to the antenna and by the other dedicated ports to the diplexers. This is the type of antenna feed network developed in this communication, for two Ka sub-bands centered in 21.7 and 28.7 GHz, respectively, with 4\% and 6\% fractional bandwidth, approximately. The developed OMT is based on a double symmetry junction (Boifot et al, "Simple and broadband orthomode transducer," IEE Proc. H Microw., Ant. and Prop., vol. 137, no. 6, pp. 396-400, Dec 1990.). In its simpler version, it has a metallic septum and full height vertical pins to match the vertical polarization. The effect of these pins will be studied. The routing network is another important part of the device, with a great impact on the size of the component and in the manufacturing method (see for instance Ruiz-Cruz et al. "Full-wave modeling and optimization of Boifot junction ortho-mode transducers," Int. J RFMiCAE, vol. 18, no. 4, pp. 303-313, July 2008). These different alternatives will be studied in the presentation. The diplexers are based on E-plane bifurcations with well-known low-pass and high-pass filters. The dimensions of the waveguides connecting the ortho-mode transducer and the waveguide diplexers are non-standard, in order to reduce the total feeder length, since transitions to standard waveguides are avoided. The diplexer is manufactured without any tuning element. Therefore, accurate CAD tools are required for the design, along with a precisely controlled fabrication.The design and evaluation of the different components will be addressed in the presentation, showing the experimental measurements, the expected simulated responses and the critical points found in the development of the antenna feeder.},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Mart{\i}n, M J and Garc{\'\i}a, V}
}
@conference {09_URSIUSA_Ruiz-CruzMontejo-GaraiRebollar_DesignDualBandOMTLargeSepBands,
	title = {Design of a Dual-Band Ortho-Mode Transducer for Satellite Communications with Large Separation between Bands},
	booktitle = {Proc. 2009 USNC/URSI National Radio Science Meeting},
	year = {2009},
	month = {June},
	pages = {1},
	abstract = {Ortho-Mode Transducers (OMTs) are devices used in satellite communication systems to discriminate the two orthogonal signals received or transmitted by a dual-polarization antenna. For linear polarization, they set a signal path between the vertical polarization in the common port and a monomode port dedicate for that polarization. The horizontal polarization, also found in the common port, follows a different path till another dedicated port. Thus, the OMT, usually implemented in waveguide technology in satellite applications, has three physical ports and four electrical ports (the common one hosts the two orthogonal polarizations). The advantage of using such devices is that they increase the capacity information of the satellite link, since the two polarizations can share the same frequency band. The main features to control in the design of an OMT are the return and insertion losses, the isolation between polarizations and the power handling capabilities. The bandwidth is a critical parameter and it is in close relation to the symmetry of the physical structure of the OMT (see for instance G. Pelosi, R Nesti, and G G Gentili, {\^a}{\texteuro}\~{}{\^a}{\texteuro}\~{}Orthomode transducers,{\^a}{\texteuro}{\texttrademark}{\^a}{\texteuro}{\texttrademark} Encyclopedia of RF and Microwave Eng., Wiley, New York, 2005). The Computer Aided Design (CAD) of the OMT is another aspect to take into account. In our work, the OMT is divided into building blocks which are designed individually. They are analyzed with a full-wave method which provides its Generalized Admittance Matrix (GAM) or Generalized Scattering Matrix (GSM). The interaction of the building blocks is considered in a second stage. This design procedure will be described in the presentation. The compactness of the mechanical structure can be also a very significant aspect of the OMT selection. Different alternatives using Boifot and Turnstile junctions have been compared. In addition, the OMT construction will be also discussed, since it is very important to reduce the number of parts to be connected. More waveguide flanges increase the losses, the risk of passive intermodulation and limit the maximum power to transmit. These different aspects will be seen in the presentation, with focus on an OMT in C-band with more than 40\% separation between bands. The experimental measurements of a manufactured prototype will be shown.},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@article {09-WT-B-WCDMADownlinkinLongTunnels,
	title = {Downlink capacity and interference statistics of wideband code division multiple access microcells for trains in long tunnels},
	journal = {IET Communications},
	volume = {3},
	number = {4},
	year = {2009},
	pages = {603-609},
	url = {http://dx.doi.org/10.1049/iet-com.2008.0356},
	author = {B Taha-Ahmed and Miguel Calvo-Ram{\'o}n}
}
@article {09-WT-B-WCDMADownlinkCapacity,
	title = {Downlink capacity and interference statistics of wideband code division multiple access microcells for trains in long tunnels},
	journal = {Communications, IET},
	volume = {3},
	number = {4},
	year = {2009},
	month = {April},
	pages = {603-609},
	keywords = {broadband networks, code division multiple access, downlink capacity, interference (signal), interference statistics, multipath interference, statistical analysis, tunnel cigar-shaped microcell, tunnels, underground communication, wideband code division multiple access},
	issn = {1751-8628},
	doi = {10.1049/iet-com.2008.0356},
	author = {Ahmed, B T and Ramon, M C}
}
@article {9_DualPolarizerPIER,
	title = {Dual Linear/Circular Polarized Plannar Antenna with Low Profile Double-Layer Polarizer of 45{\textpm} Tilted Metallic Strips for WIMAX Applications},
	journal = {PIER - Progress in Electromagnetics Research},
	volume = {98},
	year = {2009},
	month = {Oct.},
	pages = {221-231},
	abstract = {A low profile double-layer polarizer structure is presented for planar patch antennas to obtain circular polarization in 3.5 GHz WiMAX band (3.4-3.6 GHz?5.7\% bandwidth). Each polarizer layer is composed of 45{\textordmasculine} tilted metallic strips on a printed circuit. A bandwidth widening is obtained due to a significant reduction of the distance between polarizer and patches. The associated effects from the interaction of the two structures have been studied. A 2x2 array prototype has been implemented and measured, with a 8\% average bandwidth in reflection and dual linear/circular polarization.},
	issn = {1559-8985},
	doi = {10.2528/PIER09092406},
	url = {http://www.jpier.org/PIER/pier98/13.09092406.pdf},
	author = {J L Masa-Campos and Gonz{\'a}lez-Fern{\'a}ndez, F}
}
@conference {08_URSIUSA_Ruiz-CruzMontejo-GaraiRebollar_DesignandFull-Wave,
	title = {Design and Full-Wave Optimization of a Ku-Band Rectangular Waveguide Triplexer},
	booktitle = {Proc. 2008 USNC/URSI National Radio Science Meeting},
	year = {2008},
	month = {July},
	pages = {1},
	abstract = {Triplexers are devices widely used on communication systems for either splitting a signal into three different sub-bands associated to three different ports or combining three sub-bands into a signal with a broader frequency range. This frequency discrimination facility of the triplexers allows the use of the same antenna for different frequency bands, achieving an important reduction of mass and volume in the hardware equipment. Moreover, in satellite communication systems, the triplexer design is constrained to very stringent electrical requirements. The main features to control are the selectivity of the channels, the insertion losses and the power handling capability. In addition, a very accurate Computer-Aided Design (CAD) is necessary to reduce/avoid the need for tuning screws or any additional adjustments, which limit the maximum power to transmit, generate Passive InterModulation (PIM) products and increase the Multiplaction risk, raising the cost of the device in the design and experimental stages of the device. A triplexer consists of the following elements: a power divider and three channel filters. There are a wide variety of possibilities for these elements (see for instance J Uher et al., {\^a}{\texteuro}{\oe}Waveguide Components for antenna feed systems: Theory and CAD{\^a}{\texteuro}, Artech House, Chap.3). The selection of a particular topology is mainly determined by the channel bandwidths, frequency separation between channels, selectivity, return loss and off-band rejection. The physical configuration of the antenna feed system is another important aspect, since it usually must be very compact. In the presentation, different alternatives will be shown. One of them is the manifold configuration, with two filters in perpendicular to the manifold axis and one inline. Other option is to use an E-plane trifurcation with H-plane filters, with may provide lower insertion losses than E-plane filters. Another import asset when studying triplexer configurations is the possibility to address the CAD of the structure by means of Mode-Matching tools, since they are well-known for their accuracy and efficiency. A comparison between these different aspects will be given in the presentation, with focus on a triplexer with bands centered in 13.1, 14.12 and 18.25 GHz. The expected simulated results will be compared with the experimental measurements of a manufactured prototype for satellite applications.},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {08_URSIESP_Corcoles_DisenoAutomatizadoParches,
	title = {Dise{\~n}o automatizado de antenas de parches apilados en cavidad mediante descomposici{\'o}n de dominio en el MEF, redes neuronales y optimizaci{\'o}n global},
	booktitle = {Proc. 2008 Simposium Nacional URSI (in Spanish)},
	year = {2008},
	month = {Sep},
	pages = {1-4},
	abstract = {This work reports the development of a computeraided- design methodology consisting of three steps for probe-fed cavity-backed, stacked microstrip patch antennas. In the first step, the rigour of a numerical technique such as the finite element method (FEM) to describe the electromagnetic behaviour of these structures is incorporated. The application of the FEM is carried out on a highly efficient basis through a sophisticated domain decomposition approach. From these results, a neural network (NN) is trained to output the desired response of the antenna according to the value of design parameters. Thanks to the versatily of this NN, a global optimization through simulated annealing or genetic algorithms is lastly executed to obtain a final design. The proposed methodology is validated through a real design whose numerical results are compared with measurements with good agreement.},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Zapata, J}
}
@conference {08_URSIESP_Gonzalez-Fernandez_Disenodeantenas,
	title = {Dise{\~n}o de antenas impresas de banda ancha con polarizador para sistemas WiMAX a 3.5GHz y comunicaciones por sat{\'e}lite en banda {\^a}{\texteuro}\~{}X{\^a}{\texteuro}{\texttrademark}},
	booktitle = {Proc. 2008 Simposium Nacional URSI (in Spanish)},
	year = {2008},
	month = {Sept.},
	pages = {1-4},
	abstract = {Mobile communications terminals are strongly affected by multi-path reflection waves, so phase error can be quite important in this case. Circular polarization (CP) is used to avoid this problem, mainly caused by reflection on buildings and ground surface. The proposed antenna with parasitic strip elements as polarizer has the advantage to be robust, low cost and easy to fabricate with conventional materials and printed circuit technology. Two prototypes are exposed, WiMAX and X band, whose measures results verify the CP and show that good return loss and axial ratio characteristics have been obtained.},
	url = {http://w3.iec.csic.es/ursi/paginas/index_congresosreali.htm},
	author = {Gonz{\'a}lez-Fern{\'a}ndez, F and J L Masa-Campos and Castro, M T and J A Ruiz-Cruz}
}
@conference {08_URSIESP_Ruiz-CruzZhangMontejo-GaraiEtAl_Disenodefiltros,
	title = {Dise{\~n}o de filtros dual-mode longitudinales en gu{\'\i}a de onda rectangular},
	booktitle = {Proc. 2008 Simposium Nacional URSI (in Spanish)},
	year = {2008},
	month = {Sept.},
	pages = {1-4},
	abstract = {Dual-Mode filters are used in applications where low mass and volume are required. In this paper, the Computer Aided Design of a new rectangular waveguide filter structure is proposed for achieving the dual-mode operation. It preserves the longitudinal inline topology used in the classical circular waveguide configuration, which can provide quasi-elliptic function responses. However, it has no coupling or tuning screws and it is exclusively made up of sections of aligned rectangular waveguides. This leads to a very efficient full-wave analysis based on the Mode-Matching method. The proposed CAD is illustrated with a four order prototype, whose results are compared with other numerical technique.},
	url = {http://w3.iec.csic.es/ursi/paginas/index_congresosreali.htm},
	author = {J A Ruiz-Cruz and Zhang, Y and Montejo-Garai, J R and Rebollar, J M and Zaki, K A}
}
@conference {08_URSIESP_Izquierdo-MartinezRuiz-Cruz_DisenodeOMTs,
	title = {Dise{\~n}o de OMTs (Ortho-Mode Transducers) con la uni{\'o}n Turnstile},
	booktitle = {Proc. 2008 Simposium Nacional URSI (in Spanish)},
	year = {2008},
	month = {Sept.},
	pages = {1-4},
	abstract = {This paper presents the design of an orthomode transducer (OMT) based on the Turnstile junction with two main characteristics: a) the routing branches for each polarization are made in both E- and H-plane configuration, and b) the used Turnstile junction has an optimized internal profile inspired on mitered bends. These branches are made up of well-known waveguide elements, such as E- and H-plane bends and height transformers, which can be efficiently analyzed by specialized codes or available commercial software. The proposed structures are illustrated with the design of a complete OMT. The numerical simulations of the OMT elements and the performance of the overall structure in the band 13-19 GHz are presented in this communication, obtaining return losses better than 24dB in a 37\% fractional bandwidth for both polarizations.},
	url = {http://w3.iec.csic.es/ursi/paginas/index_congresosreali.htm},
	author = {Izquierdo-Martinez, I and J A Ruiz-Cruz}
}
@conference {07_APS_Ruiz-CruzMontejo-GaraiRebollarEtAl_DesignofRiblet-type,
	title = {Design of Riblet-type couplers for Ka band applications},
	booktitle = {Proc. 2007 IEEE Antennas and Propagation Society International Symposium},
	year = {2007},
	month = {June},
	pages = {4276-4279},
	abstract = {The full-wave modeling and design of short-slot Riblet waveguide couplers are addressed in this contribution. These types of directional couplers are commonly used by their compact size in comparison with other waveguide configurations. The main features of the Riblet coupler are discussed and its modeling with different input/output excitations is described. Two different designs are shown, with either rectangular waveguide input/output ports or coaxial interfaces. The expected simulated results of two manufactured prototypes operating at 19 GHz are compared with their experimental measurements.},
	keywords = {coaxial interfaces, directional couplers, directional couplersRiblet-type couplers, frequency 19 GHz, full-wave modeling, input/output excitations, rectangular waveguide input/output ports, short-slot Riblet waveguide couplers},
	issn = {1-4244-0878-4},
	doi = {10.1109/APS.2007.4396486},
	url = {http://ieeexplore.ieee.org/iel5/4395409/4395410/04396486.pdf?tp=\&isnumber=\&arnumber=4396486},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Daganzo, A I and Hidalgo-Carpintero, I}
}
@conference {07_URSIESP_Ruiz-CruzMontejo-GaraiRebollarEtAl_DisenodeAcopladores,
	title = {Dise{\~n}o de Acopladores Tipo Riblet en Banda Ka},
	booktitle = {Proc. 2007 Simposium Nacional URSI (in Spanish)},
	year = {2007},
	month = {Sept.},
	pages = {1-4},
	abstract = {The full-wave modelling and design of short-slot Riblet waveguide couplers are addressed in this contribution. These types of directional couplers are commonly used by their compact size in comparison with other waveguide configurations. The main features of the Riblet coupler are discussed and its modeling with different input/output excitations is described. Two different designs are shown, with either rectangular waveguide input/output ports or coaxial interfaces. The expected simulated results of two manufactured prototypes operating at 19 GHz are compared with their experimental measurements.},
	url = {http://w3.iec.csic.es/ursi/articulos_desde_2007/la_laguna_2007/PDF/p206.pdf},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Daganzo, A I and Hidalgo-Carpintero, I}
}
@conference {06_EuMC_Montejo-GaraiRuiz-CruzRebollarEtAl_DesignofSelf-Equalised,
	title = {Design of Self-Equalised Elliptic Filter Channels in Ka-Band Implemented in Rectangular H-Plane Waveguide},
	booktitle = {Proc. 36th European Microwave Conference},
	year = {2006},
	month = {Sept.},
	pages = {1087-1090},
	abstract = {In this article, a systematic design procedure for the design of self-equalised elliptic filters in H-plane configuration is presented. Such a configuration in tends to be an alternative to the classical dual-mode circular waveguide configuration in Ka band, with the aim in mind of reducing cost and computation time. In order to decrease the insertion loss the TE105 will be used. A sixth order filter with two transmission zeros at finite real frequencies and two zeros for equalisation has been designed, manufactured and measured. The results make clear the validity of the proposed configuration},
	keywords = {dual mode circular waveguide, elliptic filter channels, elliptic filters, Ka-band, microwave filters, Milling, mode matching, poles and zeros, rectangular waveguide, rectangular waveguides, self-equalised filter, systematic design procedure, waveguide filtersH-plane configuration},
	issn = {2-9600551-6-0},
	doi = {10.1109/EUMC.2006.281123},
	url = {http://ieeexplore.ieee.org/iel5/4057701/4057702/04058013.pdf?tp=\&isnumber=\&arnumber=4058013},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and Rebollar, J M and Onoro-Navarro, A. and Hidalgo-Carpintero, I and Padilla-Cruz, M J}
}
@conference {06_URSIESP_Montejo-GaraiRuiz-CruzRebollar_Disenodefiltros,
	title = {Dise{\~n}o de filtros de Canal El{\'\i}pticos y Autoecualizados en Banda Ka implementados en gu{\'\i}a rectangular plano H},
	booktitle = {Proc. 2006 Simposium Nacional URSI (in Spanish)},
	year = {2006},
	month = {Sept.},
	pages = {1-3},
	abstract = {In this article, a systematic design procedure for the design of self-equalized elliptic filters in H-plane configuration is presented. Such a configuration intends to be an alternative to the classical dual-mode circular wave guide configuration in Ka band, with the aim in mind of reducing cost and computation time. In order to decrease the insertion loss the TE105 will be used. A sixth order filter with two transmission zeros at finite real frequencies and two zeros for equalization has been designed, manufactured and measured. The results make clear the validity of the proposed configuration.},
	url = {http://w3.iec.csic.es/ursi/articulos_oviedo_2006/articulos/sesionMOP-III-13small.pdf},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and Rebollar, J M}
}
@conference {05_APS_ZhangZakiRuiz-Cruz_Dualmodebandpass,
	title = {Dual mode bandpass filter with asymmetric transfer function},
	booktitle = {Proc. 2005 IEEE Antennas and Propagation Society International Symposium},
	volume = {2B},
	year = {2005},
	month = {July},
	pages = {634-637},
	abstract = {We demonstrate the feasibility of dual mode implementation of an asymmetric elliptic filter. A filter which has four poles and one transmission zero is synthesized from the general Chebyshev transfer function. The ideal electrical network of the longitudinal form is then obtained through several "rotation" operations on the initial coupling matrix. Finally, the dual mode circular waveguides are adopted to realize the ideal network.},
	keywords = {asymmetric elliptic filter, asymmetric transfer function, band-pass filters, Chebyshev filters, circular waveguides, coupling matrix, dual mode bandpass filter, dual mode circular waveguides, elliptic filters, ideal network, microwave filters, poles, poles and zeros, rotation operations, transfer function matrices, transmission zero, waveguide filters Chebyshev transfer function},
	issn = {0-7803-8884-4},
	doi = {10.1109/APS.2005.1552092},
	url = {http://ieeexplore.ieee.org/iel5/10402/33057/01552092.pdf?tp=\&isnumber=\&arnumber=1552092},
	author = {Zhang, Y and Zaki, K A and J A Ruiz-Cruz}
}
@conference {04_URSIESP_Ruiz-CruzMontejo-GaraiRebollar_Disenoymedida,
	title = {Dise{\~n}o y medida de un filtro dual-mode en cavidad el{\'\i}ptica},
	booktitle = {Proc. 2004 Simposium Nacional URSI (in Spanish)},
	year = {2004},
	month = {Sept.},
	pages = {1-4},
	abstract = {This work presents the design and results of a Dual-Mode waveguide filter implemented with elliptic cavities and rectangular irises. A four-order elliptic filter responseis designed in X band, centered in 11.8 GHz and bandwidth of 100 MHz. The analysis is made by rigorous Mode-Matching with a basic building block based on the discontinuity between an elliptic and a rectangular waveguide. An experimental prototype is built and measured. Good agreement is obtained between theory and experimental data.},
	url = {http://w3.iec.csic.es/ursi/articulos_barcelona_2004/articulos/ursi0115.pdf},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {04-WT-B-FDSS_GSMOverlay,
	title = {Down-link analysis of a FDSS-GSM overlay system},
	booktitle = {Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th},
	volume = {5},
	year = {2004},
	month = {May},
	pages = {2502-2506},
	keywords = {Base stations, cellular radio, channel capacity, diversity reception, Downlink, downlink analysis, downlink capacity, FDSS-GSM overlay system, Frequency diversity, frequency diversity spread spectrum system, GSM, Interference, mobile system capacity limit, Multiaccess communication, Performance analysis, Power system modeling, spread spectrum communication, System performance},
	issn = {1550-2252},
	doi = {10.1109/VETECS.2004.1391373},
	author = {Taha-Ahmed, B and Calvo-Ramon, M and de Haro-Ariet, L}
}
