@article {20_IEEE ACCESS_LUCAS POLO_ARRAY DESFASADORES TORNILLOS,
	title = {Mechanically Reconfigurable Linear Phased Array Antenna Based on Single-Block Waveguide Reflective Phase Shifters With Tuning Screws},
	journal = {IEEE Access},
	volume = {8},
	year = {2020},
	pages = {113487-113497},
	abstract = {This work presents the design and prototyping of a reconfigurable phased array in Ku band (16 to 18 GHz) implemented in waveguide technology. The design is based on the use of a novel seamless waveguide module integrating four reconfigurable phase shifters to adjust the relative phase shift between the unitary elements of a linear array, which are illuminated uniformly by a corporate waveguide feeding network. The phase shifters are implemented by a 90{\textdegree} hybrid coupler in waveguide technology where two of its ports are loaded with a tunable reactive load, implemented in this proof of concept with a tuning screw. The four phase shifters have been manufactured in a single part using direct metal laser sintering, avoiding the losses related to bad electric contacts and misalignments associated to multipart devices. This also simplifies the assembly of the full phased array, leading to a modular approach with three parts whose design can be addressed separately. The experimental results for the complete array antenna show great performance and demonstrate that the main-lobe of the radiation pattern can be effectively scanned continuously between the angles -25{\textdegree} and 25{\textdegree}, with a high efficiency in the whole design band thanks to the proposed waveguide implementation.},
	keywords = {antenna radiation patterns, Beam steering, Couplers, Fasteners, linear antenna arrays, phase shifters, Phased arrays},
	issn = {2169-3536},
	doi = {10.1109/ACCESS.2020.3003193},
	author = {L Polo-Lopez and J L Masa-Campos and A T Muriel-Barrado and P Sanchez-Olivares and E Garcia-Marin and J C{\'o}rcoles and J A Ruiz-Cruz}
}
@article {Polo-Lopez20208203,
	title = {Modal Field Synthesis of Monopulse Difference Patterns for Radiating Aperture},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {68},
	number = {12},
	year = {2020},
	note = {cited By 0},
	pages = {8203-8208},
	doi = {10.1109/TAP.2020.2997477},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098141132\&doi=10.1109\%2fTAP.2020.2997477\&partnerID=40\&md5=382b64c436a29c18c5bb3a1eb34aca2a},
	author = {Polo-Lopez, L. and J C{\'o}rcoles and Ruiz-Cruz, J.A.}
}
@article {18_TAP_PABLO-SANCHEZ_WG-SLOT-ARRAY-TUNING-SCREWS,
	title = {Mechanical Technique to Customize a Waveguide-Slot Radiating Performance},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {66},
	year = {2018},
	pages = {426-431},
	abstract = {A mechanical technique to tune the radiating performance of a waveguide-fed slot is presented. Three metallic tuning screws are introduced through the bottom wall of the feeding waveguide. The field radiated by the slot is mechanically controlled with the insertion length of the tuning screws and a good input matching response is also maintained. One of the tuning screws modifies the slot coupling parameter as well as the phase of the transmitted signal, while the other pair of screws compensates the impedance mismatch introduced by the first one. A five-element traveling-wave (TW) linear array antenna has been designed and manufactured as a proof of concept to validate the performance of the tuning screws. Several improvements such as a main beam steering range of 17{\textdegree}, an enhancement of the antenna efficiency, the mitigation of the undesirable grating lobe appearance typical of TW air-waveguide-fed arrays, as well as the compensation of the mutual coupling effects or manufacturing tolerance errors could be experimentally achieved by using the proposed mechanism based on tuning screws.},
	keywords = {linear arrays, Slot antennas, waveguide arrays},
	issn = {0018-926X},
	doi = {10.1109/TAP.2017.2772078},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=8103014},
	author = {P Sanchez-Olivares and J L Masa-Campos and J Hernandez-Ortega}
}
@article {18_AWPL_PABLO-SANCHEZ_CORPORATE-ARRAY-TUNING-SCREWS,
	title = {Mechanically Reconfigurable Linear Array Antenna Fed by a Tunable Corporate Waveguide Network With Tuning Screws},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {17},
	number = {8},
	year = {2018},
	month = {Aug},
	pages = {1430-1434},
	abstract = {A mechanical technique to provide beam-steering capabilities to a linear array antenna is presented. The methodology is based on the insertion of metallic tuning screws into power dividers in rectangular waveguide technology. These tuning screws establish a short circuit between the top and bottom plates of the waveguide, and a phase change in the transmitted signal is then generated. Therefore, the phase difference between the output ports of a conventional waveguide divider can be controlled with these tuning screws. A corporate waveguide feeding network with several tuning screws has been designed. This tunable waveguide network is used to feed an aperture stacked patch array, forming the final mechanically reconfigurable linear array. Seven different phase configurations have been synthetized by using the tuning screws, which provide a noncontinuous angular scanning. In particular, a main beam steering from -26{\textdegree} to +26{\textdegree} with 13 discrete radiation patterns has been obtained. The use of waveguide technology makes the proposed reconfigurable antenna suitable for low-loss and high-power applications. Total efficiency values higher than 90\% have been achieved for every configuration.},
	keywords = {Aperture-coupled antennas, Beam steering, Electromagnetic waveguides, Fasteners, linear antenna arrays, microwave antenna arrays, Tuning, waveguide arrays},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2018.2848911},
	url = {https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=8388289},
	author = {P Sanchez-Olivares and J L Masa-Campos and A T Muriel-Barrado and R Villena-Medina and G M Fernandez-Romero}
}
@article {17_TAP_PABLO-SANCHEZ_RECONF_RADIALWG_ARRAY,
	title = {Mechanically Reconfigurable Conformal Array Antenna Fed by Radial Waveguide Divider With Tuning Screws},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {65},
	year = {2017},
	pages = {4886-4890},
	abstract = {A conformal array antenna with a reconfigurable radiation pattern in the azimuth plane at Ku band is presented. An eight-faced prism has been set as 3-D antenna structure. The radiating element consists of a rectangular waveguide ended on a slotted cavity. A radial waveguide network (RWGN) fed by a symmetrically placed coaxial probe has been implemented to equally feed each radiating element obtaining an omnidirectional behavior in the azimuth plane. The insertion of several metallic tuning screws (TSs) provides a reconfiguration mechanism of the electric field distribution in the RWGN and modifies the conformal array antenna amplitude feeding. Eight different configurations generating directional radiation patterns can be tuned by means of the insertion of certain TSs. In addition, the symmetrical positioning of them allows performing a main beam scanning every 45{\textdegree} in the azimuth plane. Several prototypes have been manufactured and measured to experimentally validate the antenna performance. A total of 65 different radiation patterns have been experimentally obtained using the proposed TSs, which provides a simple, low-loss, and low-cost reconfigurability mechanism to the presented conformal array antenna.},
	keywords = {Conformal antenna, Slot antennas, waveguide arrays},
	issn = {0018-926X},
	doi = {10.1109/TAP.2017.2723918},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=7970137\&isnumber=8024125},
	author = {P Sanchez-Olivares and J L Masa-Campos}
}
@conference {17_EUCAP_PABLOSANCHEZ_SingleSlot_TuningScrews_eucap,
	title = {Mechanically reconfigurable waveguide-slot single element using tuning screws},
	booktitle = {Antennas and Propagation (EUCAP), 2017 11th European Conference on},
	year = {2017},
	month = {March},
	pages = {1962-1966},
	abstract = {A mechanically reconfigurable waveguide-slot single radiating element is presented. The tuning mechanism consists on three metallic screws introduced through the bottom wall of the feeding waveguide. The insertion length of the tuning screws and the distance to the slot are used to control the radiated signal as well as to maintain a good input matching response. Several prototypes with different slot lengths have been manufactured to experimentally validate the reconfigurable performance. The proposed triple tuning screw waveguide-slot radiator provides a low cost and simple mechanism to conform a reconfigurable array antenna.},
	keywords = {reconfigurable antenna, Slot antennas, waveguide antennas.},
	doi = {10.23919/EuCAP.2017.7928264},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=7928264},
	author = {P Sanchez-Olivares and J L Masa-Campos and J Hernandez-Ortega}
}
@article {15_TAP_RubioIzqdoCorcoles_ModalNetworkMIMO,
	title = {Mutual Coupling Compensation Matrices for Transmitting and Receiving Arrays},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {63},
	number = {2},
	year = {2015},
	month = {Feb},
	pages = {839-843},
	abstract = {A general method to obtain a matrix which allows the compensation of mutual coupling effects in transmitting arrays for the total field in all directions is introduced. This method is independent of the numerical method used in the analysis and it can include the effect of the antenna platform. The starting point can be the active element patterns or the spherical mode expansion from spherical near-field antenna measurements. Additionally, the spherical mode expansion is also used to find a matrix which allows the compensation of mutual coupling effects in receiving arrays. Through this theory, a simple relation between the compensation matrices of the transmitting and the receiving arrays is found. As a consequence, the scattering matrix of a circuit that allows the simultaneous compensation of mutual coupling effects for the transmission and the reception problem can be easily defined. Finally, it will be shown how the capabilities of the compensation in all directions depend strongly on the array element.},
	keywords = {Active element pattern, antenna array, Antenna arrays, Antenna measurements, antenna radiation patterns, finite element analysis, Mutual coupling, mutual coupling compensation, spherical mode expansion, transmitting antennas, Vectors},
	issn = {0018-926X},
	doi = {10.1109/TAP.2014.2382691},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6987253},
	author = {Rubio, J and Izquierdo, J F and J C{\'o}rcoles}
}
@conference {14_URSIESP_Corcoles_SintesisdeFourier,
	title = {Matriz de compensaci{\'o}n de acoplos mutuos para agrupaciones de antenas en problemas de radiaci{\'o}n},
	booktitle = {Proc. 2014 Simposium Nacional URSI (in Spanish)},
	year = {2014},
	month = {Sep},
	pages = {1-4},
	abstract = {In this work, a general method to obtain a matrix which allows compensating the mutual coupling effects in arrays for the total field in all directions is introduced. This method is independent of the numerical method used in the analysis and it can include the effect of the antenna platform. The starting point can be the active element patterns or spherical near-field antenna measurements. It will be shown how the capabilities of compensation depend strongly on the array element.},
	author = {Rubio, J and Izquierdo, J F and J C{\'o}rcoles}
}
@article {14_IEEETMTT_Leal-SevillanoYingaTaoLancasterEtAl_MicromachinedDual-BandOrthomode,
	title = {A Micromachined Dual-Band Orthomode Transducer},
	journal = {IEEE Transactions on Microwave Theory and Techniques},
	volume = {62},
	number = {1},
	year = {2014},
	month = {January},
	pages = {55-63},
	abstract = {In this paper, an orthomode transducer (OMT) for dual-band operation and optimized for stacked micromachined layers implementation is presented. The proposed design avoids the use of septums, irises, pins, or small features and minimizes the number of equal-thickness micromachined layers required. In this way, the micromachining fabrication is simplified, making the proposed design a very attractive candidate for high frequency applications and for low-cost batch production. A W-band dual-band design (one different polarization in each frequency band) with more than 10\% fractional bandwidth for each band and 30\% separation between bands is presented. In addition, proper routing and layered bends are designed for an optimum standard interfacing with the same orientation of the input/output ports. Two OMTs in a back-to-back configuration are fabricated using a thick SU-8 photo-resist micromachining process. A total of six stacked SU-8 layers, all of them with the same thickness of 635 micrometers, are used. The experimental results are coherent with the tolerance and misalignment of the process, validating the proposed novel OMT design.},
	issn = {0018-9480},
	doi = {10.1109/TMTT.2013.2292611},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6678791},
	author = {C A Leal-Sevillano and YingaTao, T and Lancaster, M J and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@article {22_materialsPIER-M,
	title = {Material{\textquoteright}s Insertion Loss at 2.4, 3.3 and 5.5 GHz Bands},
	journal = {PIER-M: Progress in Electromagnetics Research M},
	volume = {30},
	year = {2013},
	month = {Mar.},
	pages = {1-10},
	abstract = {The insertion loss of different materials is measured at 2.4, 3.3 and 5.5 GHz bands. Directive antennas with a nominal gain of 19 dB are used in the measurement campaign. The height of the antennas has been selected to have the minimum possible reflection from around surfaces. Metallic door with porthole window, metallic grid, glass window, human beings and tree{\textquoteright}s insertion loss are measured. The metallic grid presents a band pass filter function with a resonance frequency between 3.2 to 3.3 GHz. Other materials have an insertion loss that increases with the increment of the operating frequency.},
	issn = {1937-8726},
	doi = {10.2528/PIERM13022803},
	url = {http://www.jpier.org/PIERM/pierm30/01.13022803.pdf},
	author = {B Taha-Ahmed and I {\'A}lvarez-Calvo and J L Masa-Campos}
}
@article {23_materialsPIER-L,
	title = {Material{\textquoteright}s Insertion Loss in Three Frequency Bands},
	journal = {PIER-L: Progress in Electromagnetics Research Letters},
	volume = {39},
	year = {2013},
	month = {Apr.},
	pages = {199-205},
	abstract = {The insertion loss of different materials is measured at 2.4, 3.3 and 5.5 GHz bands. Directive antennas with a nominal gain of 19 dB are used in the measurement campaign. The height of the antennas has been selected to have the minimum possible reflection from around surfaces. Thick concrete wall, thick concrete column and tree{\textquoteright}s insertion loss are measured. It is noticed that the insertion loss increases with the increment of the operating frequency. For tress, the insertion loss for the leafless tress is 6 to 10 dB lower than the deciduous trees.},
	issn = {1937-6480},
	doi = {10.2528/PIERL13040906},
	url = {http://www.jpier.org/PIERL/pierl39/20.13040906.pdf},
	author = {B Taha-Ahmed and I {\'A}lvarez-Calvo and J L Masa-Campos}
}
@article {13_IETMAP_Montejo-GaraiRuiz-CruzLeal-SevillanoEtAl_ModelingofDual-PolarizationDiplexers,
	title = {Modeling of Dual-Polarization Diplexers Based on Enhanced Multiport Turnstile Junctions},
	journal = {IET Microwaves, Antennas and Propagation},
	volume = {7},
	number = {7},
	year = {2013},
	month = {May},
	pages = {485-492},
	abstract = {The modelling of waveguide diplexers working simultaneously with two dual-polarisation signals is presented in this study. The proposed network is an ortho-mode junction with six physical ports based on an enhanced multiport turnstile junction. This structure is excited at the common port coming from the antenna, by two signals at different frequency bands which are required to be discriminated into dedicated ports. The added functionality of the structure presented in this work is that each frequency band can also allocate two orthogonal polarisations (dual linear or dual circular) with a very large separation between bands (fractional bandwidth larger than 55\%), using two different waveguiding concepts. The first one is based on confining the high frequencies at the centre of the axial path. The second one is just the dual, diverting the high frequencies to the outer boundaries of the axial path. The proposed structures, whose modelling and design will be addressed, are suited for low insertion loss and high-power applications, since they do not use metallic pins, irises or small waveguide sections. Moreover, as consequence of the introduced waveguiding concepts, they are very compact and short in the axial direction, which is crucial for this type of feeders in satellite applications.},
	keywords = {antenna feeds, multifrequency antennas, multiplexing equipment, multiport networks, waveguide junctions},
	issn = {1751-8725},
	doi = {10.1049/iet-map.2012.0424},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6552358},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and C A Leal-Sevillano and Rebollar, J M}
}
@article {13-WT-B-WCDMAwithinCarsandBuses,
	title = {Multipath Effect on the WCDMA Uplink Capacity of Highways Cigar-Shaped Microcells with Users within Cars and Buses},
	journal = {Wireless Personal Communications},
	volume = {71},
	number = {3},
	year = {2013},
	pages = {1649-1662},
	url = {http://dx.doi.org/10.1007/s11277-012-0900-3},
	author = {B Taha-Ahmed}
}
@conference {12_IMS_DaneshmandA.FahmiEtAl_MEMSMultiportSwitches,
	title = {MEMS Multiport Switches and Switch Matrices for Satellite Applications},
	booktitle = {2012 IEEE MTT-S International Microwave Symposium Digest},
	year = {2012},
	month = {June},
	pages = {1-4},
	issn = {0149-645X},
	author = {Daneshmand, M and Fomani, A A and Fahmi, M M and J A Ruiz-Cruz and Mansour, R R}
}
@conference {12_CSTUGM_Montejo-GaraiLeal-SevillanoRuiz-CruzEtAl_MultipactionBreakdownPrediction,
	title = {Multipaction Breakdown Prediction of Passive Microwave Devices with CST Particle-Studio},
	booktitle = {2012 CST European User Group Meetings},
	year = {2012},
	month = {May},
	keywords = {CST},
	author = {Montejo-Garai, J R and C A Leal-Sevillano and J A Ruiz-Cruz and Rebollar, J M}
}
@article {12-WT-B-HAPsWCDMA,
	title = {Multiservice capacity and interference statistics of the uplink of high altitude platforms (HAPs) for asynchronous and synchronous WCDMA system},
	journal = {Annales des Telecommunications},
	volume = {67},
	number = {9-10},
	year = {2012},
	pages = {503-509},
	url = {http://dx.doi.org/10.1007/s12243-012-0286-y},
	author = {B Taha-Ahmed and Miguel Calvo-Ram{\'o}n}
}
@article {11_TAP_PontesCorcoles_ModalNetworkMIMO,
	title = {Modal Network Model for MIMO Antenna in-System Optimization},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {59},
	number = {2},
	year = {2011},
	month = {Feb},
	pages = {643-653},
	abstract = {The analysis of MIMO systems is described with the aid of a novel modal network model. For this purpose the capacity performance of typical base station and mobile station antennas in a simulated macro-cellular scenario with varying antenna inter element spacings and antenna rotation will be studied. The model is based on the modal description of typical receiving and transmitting antennas. In this manner a significant simulation time reduction is achieved which allows for faster analysis and optimization. To prove this the effects of both the mobile and base station antennas are investigated. Moreover, for the more restrictive case of base station antennas, a fully modal descriptive model is proven to yield very similar results as those from measured commercial antennas. It is found that the modal approach improves simulation speed without loss of accuracy or generality. Simulations are done for the city of Karlsruhe with a three-dimensional Ray-tracing tool.},
	keywords = {3D Ray-tracing tool, Antenna arrays, antenna inter element spacing, antenna optimization, antenna rotation, base station antenna, capacity performance, cellular radio, macro-cellular scenario, MIMO antenna, MIMO communication, MIMO network model, MIMO system, mobile antennas, mobile station antenna, modal network model, multiple-input multiple-output (MIMO), network theory, path-based channel models, receiving antenna, receiving antennas, spherical mode expansion, system optimization, transmitting antenna, transmitting antennas},
	issn = {0018-926X},
	doi = {10.1109/TAP.2010.2096179},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5654566},
	author = {Pontes, J and J C{\'o}rcoles and Gonz{\'a}lez, M A and Zwick, T}
}
@conference {11_MULCOPINN_Montejo-GaraiLeal-SevillanoRuiz-CruzEtAl_MultipactorpredictionBandStopFilters,
	title = {Multipactor prediction in waveguide band-stop filters with wideband spurious-free response},
	booktitle = {Proc. International workshop on Multipactor, Corona and Passive Intermodulation (MULCOPIM)},
	year = {2011},
	month = {Sep.},
	pages = {1-6},
	keywords = {corrugated waveguide, dual-band, mode-matching, optimization, Waveguide polarizers},
	url = {http://mulcopim.webs.upv.es/programme.html},
	author = {Montejo-Garai, J R and C A Leal-Sevillano and J A Ruiz-Cruz and Rebollar, J M and Estrada, T}
}
@article {10_IEEEMWCL_Ruiz-CruzMontejo-GaraiRebollar_MultiSectionBowTie,
	title = {Multi-Section Bow-Tie Steps for Full-Band Waveguide Polarization Rotation},
	journal = {IEEE Microwave and Wireless Components Letters},
	volume = {20},
	number = {7},
	year = {2010},
	month = {July},
	pages = {375-377},
	abstract = {A new compact multi-section structure for broadband waveguide polarization rotation is presented. The twist component is based on cascading multiple steps with bow-tie shape geometry, which are progressively rotated between the input and output rectangular waveguides. The twists show an excellent performance in the full operating frequency band, which is controlled with the number of sections and their shapes and can be designed for any rotation angle. Moreover, the bow-tie sections are very short and compact and can be easily manufactured, being well-suited for satellite applications. The proposed configuration is shown with design tables and curves for different rotation angles. Two 90{\^A}{\textdegree} twists in WR75 waveguide have been tested, showing measured return losses of 30 dB (one section) and 40 dB (two sections) from 10 to 15 GHz with a total length of 5.6 mm and 8.6 mm, respectively.},
	issn = {1531-1309},
	doi = {10.1109/LMWC.2010.2049428},
	url = {http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5481983},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@article {09_ELL_Corcoles_ModellingLOScoupledMIMO,
	title = {Modelling line-of-sight coupled MIMO systems with generalised scattering matrices and spherical wave translations},
	journal = {Electronics Letters},
	volume = {45},
	number = {12},
	year = {2009},
	month = {June},
	pages = {598-599},
	abstract = {A model to rigorously characterise line-of-sight MIMO systems is introduced. It is based on the generalised scattering matrix of each antenna, considered as isolated, and the rotation and translation coefficients of spherical modes. The resulting channel matrix rigorously includes the exact spherical vector nature of electromagnetic propagation (which may exert a significant influence over short-range links), mutual coupling effects and real antenna reflection, transmission, reception and scattering features. Numerical results are presented for MIMO systems made up of ideal dipoles.},
	keywords = {antenna reflection, channel matrix, electromagnetic coupling, electromagnetic propagation, electromagnetic wave propagation, generalised scattering matrix, line-of-sight coupled MIMO system, MIMO communication, multiple-input multiple-output system, mutual coupling effect, S-matrix theory, spherical wave translation scheme},
	issn = {0013-5194},
	doi = {10.1049/el.2009.0545},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5069759},
	author = {J C{\'o}rcoles and Pontes, J and Gonz{\'a}lez, M A and Zwick, T}
}
@article {7_Stacked_Patch_X_bandMOTL,
	title = {Monopulse beam-scanning planar array antenna in L band},
	journal = {Microwave and Optical Technology Letters},
	volume = {51},
	number = {6},
	year = {2009},
	month = {Jun.},
	pages = {1419-1424},
	abstract = {A planar antenna is presented as part of a Signal Identification System working at 1.06 GHz. The antenna presents a monopulse radiation pattern. Likewise, a scanning of the main beam direction is achieved in a {\textpm}45{\textdegree} azimuth coverage. A limited 3 dB amplitude drop of the received signal at the edges of the angular scanning area is only permitted. Furthermore, a broad beamwidth is required in the single element of the array. A rectangular linearly polarized double stacked patch has been then designed, with a significant size reduction in the nonresonant length, to increase the azimuth beamwidth of the array single element. The whole antenna structure is composed of 18 elements, which have been distributed in six columns of three patches per column. The feeding network of the array has been developed in microstrip technology, with small individual circuits connected by coaxial cables, to reduce the global losses of the system. The designed compact antenna and the transmitting and receiving equipments will be placed inside a POD on the top part of an airplane. A prototype antenna has been manufactured and measured in three different beam pointing directions. Satisfactory results have been achieved in the entire frequency band.},
	keywords = {beam-scanning array, monopulse system, stacked patch},
	issn = {0895-2477},
	doi = {10.1002/mop.23516},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.23516/abstract},
	author = {J L Masa-Campos and S{\'a}nchez-Sevilleja, S and Dom{\'\i}nguez-Grano-de-Oro, C and Sierra-P{\'e}rez, M and Fernandez-Jambrina, J L}
}
@conference {09_APS_Corcoles_MultibeamLP,
	title = {Multibeam synthesis with minimum SLL through linear programming from the GSM-analysis of an array},
	booktitle = {Antennas and Propagation Society International Symposium, 2009. APSURSI {\textquoteright}09. IEEE},
	year = {2009},
	month = {June},
	pages = {1-4},
	abstract = {The application of all sort of optimization techniques to different array pattern synthesis problems has been widely studied since the early days of antenna array design. Most of these works (generally having constraints on the array configuration) take for granted several assumptions, among which one can highlight considering isotropic sources and not taking into account coupling between array elements. Great advances have been achieved in the field of computational electromagnetics which allow complex radiating structures, including finite antenna arrays, to be analyzed from a full-wave approach inherently taking into account all electromagnetic effects. Recently, new techniques for the afore-mentioned pattern synthesis problems with the inclusion of this rigourous electromagentic (EM) analysis have been developed. In this work, the authors propose an EM-based design technique which yields the excitations of an arbitraty planar array to output a field pattern with minimum maximum sidelobe level (SLL) given the directions of various main beams with specified mainlobe widths and different relative amplitudes and phase differences. The array is characterized through a generalized scattering matrix (GSM) and its radiated field is expressed as a spherical mode expansion (SME). The accurate determination of the array GSM is needed to have it rigourously characterized, so the use of a full-wave technique is required in case complex antenna elements or arbitrary array configurations are considered. We develop the formulation to arrive at a standard linear programming (LP) problem. Numerical results of a linear array of dielectric resonator antennas (DRA{\textquoteright}s) are presented.},
	keywords = {Antenna arrays, array pattern synthesis, complex radiating structures, computational electromagnetics, Design optimization, dielectric resonator antennas, electromagentic analysis, Electromagnetic analysis, electromagnetic fields, Electromagnetic radiation, electromagnetic waves, generalized scattering matrix, GSM, linear antenna arrays, linear programming, minimum maximum sidelobe level, multibeam antennas, multibeam synthesis, optimization, S-matrix theory, SME, spherical mode expansion},
	issn = {1522-3965},
	doi = {10.1109/APS.2009.5171513},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5171513},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A}
}
@article {09_TAP_Corcoles_MultiobjectiveOptimization,
	title = {Multiobjective Optimization of Real and Coupled Antenna Array Excitations via Primal-Dual, Interior Point Filter Method From Spherical Mode Expansions},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {57},
	number = {1},
	year = {2009},
	month = {Jan},
	pages = {110-121},
	keywords = {antenna array, Antenna arrays, Apertures, dielectric resonator antennas, Filters, generalized scattering matrix, Hessian matrices, Jacobian matrices, Lighting, matrix-valued functions, maximum crosspolar level, microstrip antenna arrays, Microstrip antennas, microstrip patch array, minimum aperture illumination efficiency, multiobjective optimization, optimisation, Optimization methods, planar antenna arrays, planar array excitations, Planar arrays, primal-dual interior point method, spherical mode expansions, spherical wave expansion, Transmission line matrix methods},
	issn = {0018-926X},
	doi = {10.1109/TAP.2008.2009727},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=4797974},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Rubio, J}
}
@article {09_AWPL_Corcoles_MutualCouplingCompensation,
	title = {Mutual Coupling Compensation in Arrays Using a Spherical Wave Expansion of the Radiated Field},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {8},
	year = {2009},
	pages = {108-111},
	abstract = {This letter presents a flexible method to compensate the interelement mutual coupling (MC) effects that may degrade the field pattern of an array of real and coupled antennas. A closed-expression for a mutual coupling compensation matrix (MCCM) is derived. The MCCM is used to compensate the presence of the real individual elements{\textquoteright} patterns and the interelement MC effects for any excitations obtained with an isotropic-based pattern synthesis method. The MCCM is calculated from the generalized scattering matrix (GSM) of an antenna array and the spherical mode expansion (SME) of its radiated field. For a given array, this MCCM has to be calculated only once since it only depends on the radiating and scattering characteristics of the antenna elements as well as on their location in the array. Conditions regarding null field pattern directions can also be reinforced in the MCCM. To compute the GSM of the array and the SME of the radiated field, a validated full-wave hybrid and modular methodology is used. Numerical results of synthesized patterns where the MC effects have been compensated are presented for arrays made up of dielectric resonator antennas.},
	keywords = {antenna array, Antenna array mutual coupling, Antenna arrays, antenna radiation patterns, dielectric resonator antennas, electromagnetic coupling, field pattern, field radiation, generalized scattering matrix, interelement mutual coupling effect, isotropic-based pattern synthesis method, modular methodology, mutual coupling compensation matrix, Planar arrays, quadratic programming, S-matrix theory, scattering matrices, spherical wave expansion},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2008.2012276},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=4745777},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Rubio, J}
}
@conference {08_EIEC_Ruiz-CruzMontejo-GaraiRebollar_Modelosparala,
	title = {Modelos para la caracterizaci{\'o}n de l{\'\i}neas de transmisi{\'o}n en Terahercios},
	booktitle = {Proc. VI Encuentro Ib{\'e}rico de Electromagnetismo Computacional (in Spanish)},
	year = {2008},
	month = {Oct.},
	pages = {1-6},
	abstract = {Los medios de transmisi{\'o}n y en particular las l{\'\i}neas de transmisi{\'o}n presentan cada vez un mayor inter{\'e}s en frecuencias de las bandas de Terahercios, para su posible aplicaci{\'o}n en el dise{\~n}o de dispositivos. Para las bandas de frecuencia cl{\'a}sicas utilizadas en la ingenier{\'\i}a de radiofrecuencia (30 MHz - 300 GHz), el comportamiento de los materiales met{\'a}licos con los que se construyen las l{\'\i}neas de transmisi{\'o}n suele corresponderse con el de un buen conductor (corrientes de conducci{\'o}n mucho mayores que corrientes de desplazamiento), y la caracterizaci{\'o}n electromagn{\'e}tica de las mismas (constante de propagaci{\'o}n e impedancia caracter{\'\i}stica) utiliza en la mayor parte de las situaciones ciertas aproximaciones basadas en el cumplimiento de las condiciones de Leontovich (condici{\'o}n de impedancia superficial en la superficie del conductor). Siendo todo ello, de particular importancia para la caracterizaci{\'o}n de la constante de atenuaci{\'o}n. Sin embargo, a medida que la frecuencia de trabajo sube, el comportamiento de los materiales met{\'a}licos se aleja del modelo de conductor utilizado por la ingenier{\'\i}a de radiofrecuencia y dejan de poder realizarse las aproximaciones mencionadas. Estos cambios, adem{\'a}s de afectar a la configuraci{\'o}n del propio campo electromagn{\'e}tico, tambi{\'e}n pueden afectar de manera significativa la predicci{\'o}n de las p{\'e}rdidas en la l{\'\i}nea, caracter{\'\i}stica de primordial importancia en ingenier{\'\i}a de comunicaciones. El objetivo del presente trabajo es presentar un an{\'a}lisis riguroso de algunas geometr{\'\i}as de l{\'\i}nea de transmisi{\'o}n y comparar los resultados con los obtenidos por los modelos cl{\'a}sicos de la ingenier{\'\i}a de radiofrecuencia para intentar establecer algunos l{\'\i}mites de los mismos. Para ello se propone: 1) utilizar un modelo m{\'a}s preciso para la descripci{\'o}n de los materiales met{\'a}licos y en particular el modelo de Drude (Lectures on electrical properties of material, 1990, Oxford Science Pub) y 2) realizar un an{\'a}lisis electromagn{\'e}tico preciso, tanto para el modo fundamental como para los modos superiores, de geometr{\'\i}as cl{\'a}sicas de l{\'\i}neas de transmisi{\'o}n. La validez del modelo utilizado queda justificada por la precisi{\'o}n con la que predice en frecuencias de miles de terahercios los denominados "Surface Plasmon Polaritons" sobre superficies met{\'a}licas, recientemente publicados (M. Mansuripur et al., OPN April 2007, pp. 44-49). Esta estructura es dual de la l{\'\i}nea de transmisi{\'o}n de placas paralelas, que ser{\'a} utilizada en nuestros an{\'a}lisis. Se calculan la constante de propagaci{\'o}n del modo fundamental (TM00 {\'o} casi-TEM) y de los primeros modos superiores (TM01 y TE01) resolviendo la correspondiente ecuaci{\'o}n caracter{\'\i}stica del medio de transmisi{\'o}n (R E Collin, {\^a}{\texteuro}{\oe}Field theory of guided waves{\^a}{\texteuro} , 1991, IEEE Press). Se presentar{\'a} una comparaci{\'o}n entre los diagramas de dispersi{\'o}n obtenidos mediante la aproximaci{\'o}n de Leontovich y el an{\'a}lisis riguroso, para tratar de obtener los rangos de validez de las aproximaciones.},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@article {6_Monopulse_L_BandMOTL,
	title = {Monopulse beam-scanning planar array antenna in L band},
	journal = {Microwave and Optical Technology Letters},
	volume = {50},
	number = {7},
	year = {2008},
	month = {Jul.},
	pages = {1812-1819},
	abstract = {A planar antenna is presented as part of a Signal Identification System working at 1.06 GHz. The antenna presents a monopulse radiation pattern. Likewise, a scanning of the main beam direction is achieved in a {\textpm}45{\textdegree} azimuth coverage. A limited 3 dB amplitude drop of the received signal at the edges of the angular scanning area is only permitted. Furthermore, a broad beamwidth is required in the single element of the array. A rectangular linearly polarized double stacked patch has been then designed, with a significant size reduction in the nonresonant length, to increase the azimuth beamwidth of the array single element. The whole antenna structure is composed of 18 elements, which have been distributed in six columns of three patches per column. The feeding network of the array has been developed in microstrip technology, with small individual circuits connected by coaxial cables, to reduce the global losses of the system. The designed compact antenna and the transmitting and receiving equipments will be placed inside a POD on the top part of an airplane. A prototype antenna has been manufactured and measured in three different beam pointing directions. Satisfactory results have been achieved in the entire frequency band.},
	keywords = {beam-scanning array, monopulse system, stacked patch},
	issn = {0895-2477},
	doi = {10.1002/mop.23516},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.23516/abstract},
	author = {J L Masa-Campos and S{\'a}nchez-Sevilleja, S and Dom{\'\i}nguez-Grano-de-Oro, C and Sierra-P{\'e}rez, M and Fernandez-Jambrina, J L}
}
@conference {04_APS_Ruiz-CruzZakiRebollar_Mode-matchinganalysisof,
	title = {Mode-matching analysis of a coaxial-to-stripline discontinuity applied to the modeling of a coaxial probe},
	booktitle = {Proc. 2004 IEEE Antennas and Propagation Society International Symposium},
	volume = {2},
	year = {2004},
	month = {June},
	pages = {2139-2142},
	abstract = {The paper presents the analysis of the discontinuity between a coaxial and a generalized stripline waveguide and its application to the characterization of a probe inside a rectangular waveguide. The probe is modeled by a stripline whose inner conductor is stepped. For thin probes, just a reduced number of sections is needed and its characterization can be obtained very efficiently. The mode-matching technique is employed for analyzing the basic discontinuity, and the inner cross products between the modes are computed by means of the Bessel-Fourier series, reducing the computation time with respect to a pure numerical integration. The simulation results are compared with those obtained by other numerical techniques.},
	keywords = {coaxial probe modeling, coaxial waveguide, coaxial waveguides, coaxial-to-stripline discontinuity, computation time, Fourier series, mode matching, mode-matching analysis, numerical integration, rectangular waveguide, strip line discontinuities Bessel-Fourier series, stripline waveguide},
	issn = {0-7803-8302-8},
	doi = {10.1109/APS.2004.1330633},
	url = {http://ieeexplore.ieee.org/iel5/9253/29356/01330633.pdf?tp=\&isnumber=\&arnumber=1330633},
	author = {J A Ruiz-Cruz and Zaki, K A and Rebollar, J M}
}
@conference {01_EIEC_PageCrespo-ValeroRuiz-Cruz_Modeloscircuitalespara,
	title = {Modelos circuitales para discontinuidades en gu{\'\i}as de ondas: obtenci{\'o}n y uso en dise{\~n}o},
	booktitle = {Proc. II Encuentro Ib{\'e}rico de Electromagnetismo Computacional (in Spanish)},
	year = {2001},
	month = {Dec.},
	pages = {1},
	author = {Page, J E and Crespo-Valero, P and J A Ruiz-Cruz}
}
