@article {19_ANT_MAG_PABLO_PAULA_CONFORMADA_DIODOSPIN_3_5GHZ,
	title = {Circular Conformal Array Antenna With Omnidirectional and Beamsteering Capabilities for 5G Communications in the 3.5-GHz Range [Wireless Corner]},
	journal = {IEEE Antennas and Propagation Magazine},
	volume = {61},
	number = {4},
	year = {2019},
	month = {Aug},
	pages = {97-108},
	keywords = {5G communications, 5G mobile communication, 5G terrestrial communications, Antenna arrays, antenna radiation patterns, array elements, array signal processing, Beam steering, circular conformal array antenna, Conformal antenna, Conformal antennas, conformal structure, double-stacked microstrip patches, eight-way tunable feeding network, frequency 3.5 GHz, Frequency measurement, microstrip, microstrip antenna arrays, octagonal holding structure, omnidirectional antennas, omnidirectional radiation, P-i-n diodes, Power dividers, single radiating elements, T-junction operation modes, TFN network, tunable T-junctions},
	issn = {1558-4143},
	doi = {10.1109/MAP.2019.2920049},
	author = {P Sanchez-Olivares and P Sanchez-Dancausa and J L Masa-Campos and M Iglesias-Menendez-de-la-Vega and E Garcia-Marin}
}
@conference {19_URSI_PABLO_CONICAL_ARRAY_SLOTTED_ESCALONA,
	title = {Conical-beam travelling-wave array antenna based on slotted circular waveguide at Ku-band},
	booktitle = {Simposium Nacional URSI 2019},
	year = {2019},
	month = {September},
	abstract = {A high-gain conical-beam travelling-wave array antenna based on a slotted circular waveguide is designed at the higher part of Ku-band (16-18 GHz). The single radiating element is formed by a ring of equally spaced slots fed by a circular waveguide. The excitation of the TM01 mode provides a uniform feeding distribution to each slot, generating an omnidirectional radiation performance. Thus, an array antenna formed by 48 rings of slots is proposed following the conventional design rules of travelling-wave arrays. Every ring is optimized to achieve a uniform power distribution and consequently maximum directivity for the array antenna performance. The distance between elements is also adjusted to obtain the better input matching response and mitigate the grating lobe appearance, generating a high-gain conical-beam radiation performance suitable for satellite communications. The proposed design has been manufactured by using a 3D printing process. Input matching under -15 dB, high-gain values around 13.5 dB or total efficiency higher than 98\% have been achieved for the whole frequency band.},
	author = {P Sanchez-Olivares and J L Masa-Campos and D Escalona-Moreno and E Garcia-Marin}
}
@conference {Polo-Lopez2018424,
	title = {A Compact Lenslet as an Alternative to Corrugated Horns for Astronomy Applications},
	booktitle = {2018 48th European Microwave Conference, EuMC 2018},
	year = {2018},
	note = {cited By 0},
	pages = {424-427},
	doi = {10.23919/EuMC.2018.8541409},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059804919\&doi=10.23919\%2fEuMC.2018.8541409\&partnerID=40\&md5=eb57c7e053163f0fc1518ec052f0c4c5},
	author = {Polo-Lopez, L. and Pisano, G. and Ruiz-Cruz, J.A. and J C{\'o}rcoles}
}
@conference {18_URSI_PABLO_SANCHEZ,
	title = {Conformal Patch Array Antenna with Switchable Omnidirectional or Sectorial Coverage at 3.5 GHz},
	booktitle = {Simposium Nacional URSI 2018},
	year = {2018},
	month = {September},
	abstract = {A circularly conformal array antenna with beam steering capabilities as well as omnidirectional performance in S-band is presented. The single radiating elements are formed by double stacked microstrip patches placed on the planar faces of an octagonal supporting structure fabricated with a 3D printer. An eight-way tunable feeding network in microstrip technology is designed, manufactured and integrated into the conformal structure in order to excite the array elements. Novel tunable T-junctions based on PIN diodes are proposed to form the tunable feeding network. This novel T-junction allows a splitting configuration with uniform distribution to the two output ports, or a switching mode to deliver the signal to either output port. In all T-junction operation modes, a good input matching performance is achieved. The tunable feeding network is integrated into the conformal antenna and digitally controlled by a microcontroller Arduino UNO. A total of 29 states, grouped in 6 modes with a global matching bandwidth of 17.2\% can be selected. An omnidirectional radiation as well as beam steered directional patterns (covering 360 deg) can be electronically selected. The proposed antenna is able for future 5G terrestrial communications in the 3.5 GHz IMT range.},
	author = {P Sanchez-Olivares and P P Sanchez-Dancausa and J L Masa-Campos and M Iglesias-Menendez-de-la-Vega and E Garcia-Marin}
}
@article {17_IET_TFM-PAULA-SANCHEZ_CONF-ARRAY-SWITCHED,
	title = {Circularly conformal patch array antenna with omnidirectional or electronically switched directive beam},
	journal = {IET Microwaves, Antennas and Propagation},
	volume = {11},
	year = {2017},
	pages = {2253-2259},
	abstract = {A circularly conformal array antenna of double stacked microstrip patches is presented in two radiation versions: omnidirectional and electronically switched directive beam. Every single element is disposed on an eight-faced regular prism structure built in 3D print technology. The omnidirectional pattern is achieved in the azimuth plane by using a microstrip uniform power divider to equally excite the circular antenna. The switched directive beam coverage is obtained by replacing the uniform power divider with an electronically switched power divider. Four switched beams of 90{\textdegree} angular separation are digitally configured. A fractional matching bandwidth of 17.2\% has been measured for both omnidirectional and switched beam prototypes. The conformal antenna was entirely manufactured by using both printed circuit board and 3D printing technologies. Therefore, a very compact, low cost and light weight antenna design has been implemented, suitable to many applications such as Worldwide Interoperability for Microwave Access, wireless local area network, unmanned aerial vehicles or direction finding.},
	issn = {1751-8725},
	doi = {10.1049/iet-map.2017.0195},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=8221750},
	author = {P Sanchez-Olivares and P P Sanchez-Dancausa and J L Masa-Campos}
}
@article {17_AWPL_PABLO-SANCHEZ_RADIALWG_ARRAY_OMNI,
	title = {Compact Omnidirectional Conformal Array Antenna in Waveguide Technology},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {16},
	year = {2017},
	pages = {1102-1105},
	abstract = {A conformal array antenna has been designed in the waveguide technology in order to obtain an omnidirectional radiation pattern in the azimuth plane at the Ku-band. The antenna shape is a regular prism, where the single radiating elements, which consist of a rectangular waveguide ended on a cavity{\textendash}slot, are placed on the planar faces of the prism. The physical dimensions as well as the number of faces of the regular prism have been optimized following the conformal array formulation in order to achieve a minimum ripple omnidirectional pattern. An eight-faced regular prism with an apothem of 20.6 mm has been selected as the radiating structure. The single elements are fed by an eightway radial waveguide power divider symmetrically excited by a 50-Ω SMA input port. The use of waveguide technology to design the single elements and the feeding network makes the conformal array suitable for low losses and high-power applications. Several prototypes have been manufactured in order to experimentally validate the antenna performance. An omnidirectional pattern with a maximum ripple of 1.6 dB in the azimuth plane, 95.3\% efficiency, and 11.7\% input matching bandwidth has been measured..},
	keywords = {Conformal antennas, omnidirectional antennas, slot arrays},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2016.2622919},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=7725535},
	author = {P Sanchez-Olivares and R V Haro-Baez and P P Sanchez-Dancausa and J L Masa-Campos and J A Ruiz Cruz}
}
@article {16_AWPL_JUAN-CORCOLES_CAD_SLOTTED_ANTENNA,
	title = {Computer Automated Design of an Irregular Slotted Waveguide Array for Ku-Band},
	journal = {IEEE Antennas and Wireless Propagation Letters},
	volume = {15},
	year = {2016},
	pages = {1593-1597},
	abstract = {A computer automated design methodology to synthesize a progressive wave array antenna is presented. The proposed method is based on the generalized-scattering matrix and spherical wave expansion analysis of the array. Mutual coupling effects between radiating elements are inherently considered in the design process. A linearly polarized 24-element irregular slotted array antenna at Ku-band is presented to describe the proposed computer automated design methodology. A prototype has been manufactured to experimentally validate the antenna performance. At the design frequency (17 GHz), 15.9 dB realized gain and 97\% efficiency (excluding aluminum losses) values are achieved. Although the array is designed at a single frequency, it shows an overall experimental 7\% usable bandwidth.},
	keywords = {Array antenna, computer automated design, generalized scattering matrix, slot, spherical wave expansion},
	issn = {1536-1225},
	doi = {10.1109/LAWP.2016.2517928},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=7381600},
	author = {J C{\'o}rcoles and P Sanchez-Olivares and J Rubio and J L Masa-Campos and J. Zapata}
}
@conference {16_EUCAP_PABLOSANCHEZ_conformal_array_omni_eucap,
	title = {Conformal Array Antenna Fed by Radial-Waveguide Divider for Omnidirectional Coverage at Ku Band},
	booktitle = {Antennas and Propagation (EUCAP), 2016 10th European Conference on},
	year = {2016},
	month = {April},
	pages = {1-5},
	abstract = {A conformal array antenna for omnidirectional coverage in the azimuth plane at Ku band is presented. An eightfaced prism structure has been used to obtain the omnidirectional radiation pattern following a maximum theoretical ripple criterion. The radiating element consists of a rectangular waveguide ended on a cavity-slot. An equal power eight-way radial-waveguide divider has been designed to feed each radiating element. The use of waveguide technology minimizes the propagation losses and makes the structure suitable for high power applications with omnidirectional coverage requirements. The achieved simulation results show a maximum realized gain of 2.4 dB, a maximum ripple of 1.5 dB for the omnidirectional pattern and a matching bandwidth of 16.2\% around 17 GHz.},
	keywords = {antenna, conformal array, omnidirectional pattern., radial-waveguide},
	author = {P Sanchez-Olivares and R V Haro-Baez and P P Sanchez-Dancausa and J L Masa-Campos and J A Ruiz Cruz}
}
@conference {15_URSI_PAULA-SANCHEZ_conformalomniarray,
	title = {Conformal Patch Array Antenna at 3.5 GHz for Omnidirectional Coverage},
	booktitle = {Simposium Nacional URSI 2015},
	year = {2015},
	month = {September},
	abstract = {A conformal patch array antenna with an omnidirectional pattern in the azimuth plane at S band is presented. A theoretical study of the ripple generated in the omnidirectional radiation pattern according to the number of faces that conform the array has been analyzed. A six faced prism 3D structure has been chosen following a maximum 3 dB ripple criteria in the omnidirectional radiation pattern. A rectangular microstrip patch fed by a microstrip line has been designed as the single radiating element. To feed each radiating element an equal power division feeding network has been designed in microstrip technology. Several prototypes have been manufactured and measured. Finally, the entire conformal array has been assembled on a regular hexagonal prism fabricated in Polylactic acid material using a 3D printer to validate the theoretical and the simulation results. Higher field ripple than expected in the omnidirectional radiating pattern has been obtained in the experimental results, demonstrating that the 3 dB beamwidth of the single radiating element is a critical parameter to design for a good 3D array performance.},
	author = {P P Sanchez-Dancausa and J L Masa-Campos and P Sanchez-Olivares}
}
@article {15_PMB_ConvexImplant,
	title = {Convex optimization of MRI exposure for mitigation of RF-heating from active medical implants},
	journal = {Physics in Medicine and Biology},
	volume = {60},
	number = {18},
	year = {2015},
	pages = {7293},
	abstract = {Local RF-heating of elongated medical implants during magnetic resonance imaging (MRI) may pose a significant health risk to patients. The actual patient risk depends on various parameters including RF magnetic field strength and frequency, MR coil design, patient{\textquoteright}s anatomy, posture, and imaging position, implant location, RF coupling efficiency of the implant, and the bio-physiological responses associated with the induced local heating. We present three constrained convex optimization strategies that incorporate the implant{\textquoteright}s RF-heating characteristics, for the reduction of local heating of medical implants during MRI. The study emphasizes the complementary performances of the different formulations. The analysis demonstrates that RF-induced heating of elongated metallic medical implants can be carefully controlled and balanced against MRI quality. A reduction of heating of up to 25 dB can be achieved at the cost of reduced uniformity in the magnitude of the $\#$$\#$IMG$\#$$\#$ [http://ej.iop.org/images/0031-9155/60/18/7293/pmb516939ieqn001.gif] {$B_{1}^{+} $} field of less than 5\%. The current formulations incorporate a priori knowledge of clinically-specific parameters, which is assumed to be available. Before these techniques can be applied practically in the broader clinical context, further investigations are needed to determine whether reduced access to a priori knowledge regarding, e.g. the patient{\textquoteright}s anatomy, implant routing, RF-transmitter, and RF-implant coupling, can be accepted within reasonable levels of uncertainty.},
	url = {http://stacks.iop.org/0031-9155/60/i=18/a=7293},
	author = {J C{\'o}rcoles and E Zastrow and N. Kuster}
}
@conference {13_EuMC_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_CompactBroadbandCouplersMagicT,
	title = {Compact Broadband Couplers Based on the Waveguide Magic-T Junction},
	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 {11_EuMC_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_CADDual-BandPolarizersCorrugatedRectWg,
	title = {CAD for Dual-Band Polarizers in Corrugated Rectangular Waveguide},
	booktitle = {Proc. 41st European Microwave Conference},
	year = {2011},
	month = {Oct.},
	pages = {822-825},
	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.},
	keywords = {corrugated waveguide, dual-band, mode-matching, optimization, Waveguide polarizers},
	issn = {978-1-61284-235-6},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=224789},
	author = {C A Leal-Sevillano and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {11_IMS_Ruiz-CruzFahmiMansour_Compactfour-portRectWgSwitches,
	title = {Compact four-port rectangular waveguide switches based on simple short circuit loads},
	booktitle = {2011 IEEE MTT-S International Microwave Symposium Digest},
	year = {2011},
	month = {June},
	pages = {1-4},
	abstract = {Four-port rectangular waveguide switches presented in this paper are based on alternating simple short and open circuit loads in the waveguide path. The proposed concept eliminates the use of bulky rotary mechanisms to provide path switching. The device layout is very simple and compact and is presented for C-, R- and T-type switches. The experimental performance of a T-type switch shows a return loss better than 23 dB from 13 to 14.5 GHz, insertion loss of 0.3 $\#$x2013;0.4 dB and isolation of 28 dB.},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2011.5973154},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5973154},
	author = {J A Ruiz-Cruz and Fahmi, M M and Mansour, R R}
}
@conference {11_IMS_Ruiz-CruzFahmiDaneshmandEtAl_CompactreconfigurableWgCircularPol,
	title = {Compact reconfigurable waveguide circular polarizer},
	booktitle = {2011 IEEE MTT-S International Microwave Symposium Digest},
	year = {2011},
	month = {June},
	pages = {1-4},
	abstract = {A waveguide circular polarizer with reconfigurable polarization sense is proposed in this paper. The polarizer can be switched between right and left hand circular polarization. The polarization sense is controlled by RF MEMS switches, which commute between two states for allowing or blocking adequately two different signal paths inside the waveguide structure. The polarizer is made up of three building blocks, involving E-plane waveguide MEMS SP2T switch, ridge to waveguide transitions and a septum-orthomode transducer. A switchable Ku-band polarizer prototype is designed and tested as a proof of concept. The experimental performance shows acceptable return losses and axial ratio levels in the 12.7 to 14.8 GHz band (15.3\% fractional bandwidth). The proposed structure is compact and is useful for applications that require fast polarization switching.},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2011.5972872},
	url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5972872},
	author = {J A Ruiz-Cruz and Fahmi, M M and Daneshmand, M and Mansour, R. R}
}
@conference {10_IMS_FahmiRuiz-CruzMansourEtAl_CompactDualBandRidge,
	title = {Compact Wide-Band Ridge Waveguide Dual-Band Filters},
	booktitle = {2010 IEEE MTT-S International Microwave Symposium Digest},
	year = {2010},
	month = {May},
	pages = {888-891},
	abstract = {A compact wide-band, dual-band filter realized in air filled metallic ridge waveguides is proposed. Dual-band filters replace doubly multiplexed filters, thus simplifying the system architecture considerably. The filter is realized in a canonical folded structure layout. Coupling sections that realize strong coupling values required for the wide-band characteristics are achieved by means of transversal sections of ridges connecting the main ridge waveguide resonators. The filter is efficiently modeled using rigorous mode matching method. The filter response is further verified using a commercially available Finite Element Method software. In addition a prototype was built and tested for verification.},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2010.5517525},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05517629},
	author = {Fahmi, M M and J A Ruiz-Cruz and Mansour, R R and Zaki, K A}
}
@book {10_INTECHBook_Ruiz-CruzMontejo-GaraiRebollar_CADWgDevicesbyMM,
	title = {Computer Aided Design of Waveguide Devices by Mode-Matching Methods (in Microwave and Millimeter Wave Technologies (ISBN: 978-953-307-083-4))},
	year = {2010},
	month = {Oct 2009},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M},
	editor = {Zhurbenko, V}
}
@article {09_ELET_Ruiz-CruzMontejo-GaraiRebollarEtAl_C-BandOMT,
	title = {C-Band Orthomode Transducer for Compact and Broadband Antenna Feeders},
	journal = {Electronics Letters},
	volume = {45},
	number = {16},
	year = {2009},
	month = {July},
	pages = {813-814},
	abstract = {The design and evaluation of a compact C-band orthomode transducer for dual polarisation satellite communications is presented, covering the bands 3.7-4.2 GHz and 5.925-6.425 GHz (54\% of fractional bandwidth separation). Over such a broadband, the main difficulty is to obtain a compact structure able to fulfil the stringent satellite specifications with minimum longitudinal length. The proposed configuration, validated with a tested prototype, also reduces the number of connections and parts in the fabrication, decreasing the passive intermodulation risk and the mass and volume},
	issn = {0013-5194},
	doi = {10.1049/el.2009.1034},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5191333\&isnumber=5191328?tag=1},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Montero, J M}
}
@conference {09_IMS_FahmiRuiz-CruzZakiEtAl_CompactRidgeNRN,
	title = {Compact Ridge Waveguide Filters using Non-resonating Nodes},
	booktitle = {2009 IEEE MTT-S International Microwave Symposium Digest},
	year = {2009},
	month = {June},
	pages = {1337-1340},
	abstract = {A ridge waveguide filter based on the nonresonating node (NRN) concept is proposed. A new coupling mechanism, suitable for this realization is introduced. The proposed coupling mechanism alleviates the need to use other complicated structures and simplify the design process significantly. Rigorous mode matching method (MMM) is used to model the filter. The filter response is further verified using another numerical technique. A prototype was built and tested. Measurement results agree well with simulation.},
	issn = {0149-645X},
	doi = {0.1109/MWSYM.2009.5165952},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5165952\&isnumber=5165586},
	author = {Fahmi, M M and J A Ruiz-Cruz and Zaki, K A and Mansour, R R}
}
@article {09_IEEETMTT_FahmiRuiz-CruzMansourEtAl_CompactRidgeWaveguideTZNRN,
	title = {Compact Ridge Waveguide Filters With Arbitrarily Placed Transmission Zeros Using Nonresonating Nodes},
	journal = {IEEE Transactions on Microwave Theory and Techniques},
	volume = {57},
	number = {12},
	year = {2009},
	month = {Dec.},
	pages = {3354-3361},
	abstract = {Compact size ridge waveguide filters based on the nonresonating node concept are introduced to realize transfer functions with arbitrarily placed attenuation poles. Coupling mechanisms, suitable for the new realization are introduced in diverse $E$ -plane and $H$ -plane configurations and with different input-output interfaces. These coupling structures are studied and characterized in detail in order to simplify the design of the proposed filters. Rigorous mode-matching method is used to accelerate the full-wave design of the filter configurations, whose response is also verified using other numerical techniques and experimental data. To validate the proposed novel designs, a prototype has been built and tested. Measurement results agree well with the predicted theoretical simulations.},
	keywords = {Attenuation poles, microwave filters, mode-matching, ridge waveguides},
	issn = {0018-9480},
	doi = {10.1109/TMTT.2009.2034423},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5308444\&isnumber=5340253},
	author = {Fahmi, M M and J A Ruiz-Cruz and Mansour, R R and Zaki, K A}
}
@article {08_MOPT_CORCOLES_CADstackedpatches,
	title = {Cad of stacked patch antennas through multipurpose admittance matrices from FEM and neural networks},
	journal = {Microwave and Optical Technology Letters},
	volume = {50},
	number = {9},
	year = {2008},
	month = {Sep},
	pages = {2411-2416},
	abstract = {In this work, a novel computer-aided design methodology for probe-fed, cavity-backed, stacked microstrip patch antennas is proposed. The methodology incorporates the rigor of a numerical technique, such as finite element methods, which, in turn, makes use of a newly developed procedure (multipurpose admittance matrices) to carry out a full-wave analysis in a given structure in spite of certain physical shapes and dimensions not yet being established. With the aid of this technique, we form a training set for a neural network, whose output is the desired response of the antenna according to the value of design parameters. Last, taking advantage of this neural network, we perform a global optimization through a genetic algorithm or simulated annealing to obtain a final design. The proposed methodology is validated through a real design whose numerical results are compared with measurements with good agreement.},
	keywords = {computer-aided design, finite element methods, neural networks, optimization algorithms, stacked microstrip antennas},
	issn = {1098-2760},
	doi = {10.1002/mop.23670},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.23670/abstract},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Zapata, J}
}
@article {08_PIER_Ruiz-CruzMontejo-GaraiRebollar_CompactKuTriplexer,
	title = {Compact Full Ku-Band Triplexer With Improved E-Plane Power Divider},
	journal = {Progress in Electromagnetic Research},
	volume = {86},
	year = {2008},
	month = {October},
	pages = {39-51},
	abstract = {An improved E-plane power divider for compact waveguide triplexers with large separation between channels is presented. The configuration of the divider aims to exploit the different behavior of the device for frequency bands with large separation, leading to a very asymmetric E-plane junction. H-plane filters with inductive windows are used for each channel, in order to obtain reduced insertion losses and lower sensitivity than in metal-insert E-plane filters. The resultant triplexer configuration is very compact, and its design is analyzed and optimized by Mode-Matching. The experimental results of a full Ku-band prototype for communications satellite systems show a very good agreement with the expected simulated response.},
	issn = {1559-8985},
	doi = {10.2528/PIER08082803},
	url = {http://ceta.mit.edu/pier/pier86/03.08082803.pdf},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Sobrino, S.}
}
@conference {08_URSIUSA_Ruiz-CruzMontejo-GaraiRebollar_ComparisonofDifferent,
	title = {Comparison of Different Models to Obtain the Dispersion Diagrams of Transmission Lines at Terahertz Frequencies},
	booktitle = {Proc. 2008 USNC/URSI National Radio Science Meeting},
	year = {2008},
	month = {July},
	pages = {1},
	abstract = {Transmission lines for microwave through terahertz frequencies present an increasing interest for many research groups involved in the modelling of systems operating at these frequencies. In the theoretical characterization of waveguides at terahertz frequencies, the microwave engineering community must address two main challenges: a) the behaviour of metal conductors at this broad bandwidth requires a more evolved model than the constant conductivity model used at microwaves frequencies, and b) the Leontovich{\^A}{\textasciiacute}s conditions (surface impedance conductor model), widely used at lower frequencies to predict the conductor losses and the attenuation constant of the different waveguide modes, may not be accurate enough at frequencies in the terahertz range. In order to quantify the accuracy of the Leontovich{\^a}{\texteuro}{\texttrademark}s model, in this communication an analytic analysis for the parallel plate waveguide is proposed. It is based on a rigorous matching of the different field expressions at the interface between regions of the waveguide. For the conductor, it uses the model proposed in L Solymar classic book (Lectures on electrical properties of material, 1990, Oxford Science Pub). This model has shown its validity, for the authors, as far as a thousand of terahertzs, predicting very accurately the Surface Plasmon Polaritons on metallic surfaces (a dual structure of the parallel plate waveguide considered in this work, M Mansuripur et al., OPN April 2007, pp. 44-49). The propagation constant for fundamental (TM00 or quasi-TEM) and higher order modes (TM01 and TE01) are calculated by solving the corresponding characteristic equations (R E Collin, {\^a}{\texteuro}{\oe}Field theory of guided waves{\^a}{\texteuro} , 1991, IEEE Press), which provide the dispersion diagrams of the modes. The field pattern of the modes could be also obtained. A comparison between the dispersion diagrams obtained with the classical approach (Leontovich{\^a}{\texteuro}{\texttrademark}s approximation) and with the fullwave solution for different parallel plate dimensions will be presented. The errors for both phase and attenuation constants are quantified giving a precise idea on the validity of the different models from an engineering point of view. The results will be given for the fundamental and higher order modes.},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {07_URSIESP_Ruiz-CruzMontejo-GaraiRebollarEtAl_CADdeOMTs,
	title = {CAD de OMTs (Ortho-Mode Transducers) de Banda Ancha Basados en la Uni{\'o}n B{\o}ifot},
	booktitle = {Proc. 2007 Simposium Nacional URSI (in Spanish)},
	year = {2007},
	month = {Sept.},
	pages = {1-4},
	abstract = {This paper proposes a CAD tool for wideband OMTs based on the B{\o}ifot junction which has two interesting features. First, the OMT routing branches use well-known waveguide elements, such as truncated E-plane bends, which can be efficiently analyzed by Mode-Matching (MM) methods and can achieve wideband performance. Second, a MM technique is presented for the four-port Boifot junction, which provides its generalized multimode characterization. As a result, the whole OMT is segmented into different regions, yielding an efficient CAD tool for its optimum design. The analysis method and the designed OMT have been validated with other numerical methods and experimental results.},
	url = {http://w3.iec.csic.es/ursi/articulos_desde_2007/la_laguna_2007/PDF/p208.pdf},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Montesano, C E and Mart{\i}n, M J and Naranjo-Masi, M}
}
@article {4_Omni_antenna_parasiticstripsMOTL,
	title = {Circularly polarized omnidirectional millimeter wave monopole with parasitic strip elements},
	journal = {Microwave and Optical Technology Letters},
	volume = {49},
	number = {3},
	year = {2007},
	month = {Mar.},
	pages = {664-668},
	abstract = {A circularly polarized omnidirectional millimeter wave monopole with parasitic strip elements for a system of arrival signal direction detection in millimeter band is presented. As a consequence of the radiation pattern requirements, the proposed antenna consists of a conical skirt monopole with a polarizer radome. The polarizer converts a wave from linear to circular polarization. The proposed antenna has the advantage to be robust, low cost, and easy to fabricate with conventional materials and printed circuit technology. The study presents simulation and experimental results obtained with an antenna prototype that validate the design.},
	keywords = {arrival signal direction detection system, Circular polarization, millimeter antenna, omnidirectional antenna},
	issn = {0895-2477},
	doi = {10.1002/mop.22237},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/mop.22237/abstract},
	author = {Fern{\'a}ndez, J M and J L Masa-Campos and Sierra-P{\'e}rez, M}
}
@conference {06_CNES_Ruiz-CruzMontejo-GaraiRebollar_Comparisonofdifferent,
	title = {Comparison of different technologies to implement finite transmission zeros in cavity waveguide filters},
	booktitle = {Proc. 2006 Int. Workshop on Microwave Filters CNES-ESA},
	year = {2006},
	month = {Oct.},
	pages = {1-2},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {06_IMS_Ruiz-CruzMontejo-GaraiRebollarEtAl_ComputerAidedDesign,
	title = {Computer Aided Design of Wideband Orthomode Transducers based on the Boifot Junction},
	booktitle = {2006 IEEE MTT-S International Microwave Symposium Digest},
	year = {2006},
	month = {June},
	pages = {1173-1176},
	abstract = {A CAD tool based on the Boslashifot junction is proposed for the design of wideband orthomode transducers (OMTs). It has two interesting features. First, the OMT routing branches use well-known waveguide elements, such as truncated E-plane bends, which can be efficiently analyzed by mode-matching (MM) methods and can achieve wideband performance. Second, a MM technique is presented for the four-port Boslashifot junction, which provides its generalized multimode characterization. As a result, the whole OMT is segmented into different regions, yielding an efficient CAD tool for its optimum design. The analysis method and the designed OMT have been validated with other numerical methods and experimental results},
	keywords = {CAD, computer aided design, four-port junction, mode matching, mode-matching methods, OMT routing branches, transducers, waveguide componentsCAD tool, waveguide elements, wideband orthomode transducers},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2006.249400},
	url = {http://ieeexplore.ieee.org/iel5/4014788/4014789/04015130.pdf?tp=\&isnumber=\&arnumber=4015130},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M and Montesano, C E and Mart{\i}n, M J and Naranjo-Masi, M}
}
@article {05_IEEETMTT_Ruiz-CruzSabbaghZakiEtAl_Canonicalridgewaveguide,
	title = {Canonical ridge waveguide filters in LTCC or metallic resonators},
	journal = {IEEE Transactions on Microwave Theory and Techniques},
	volume = {53},
	number = {1},
	year = {2005},
	month = {Jan.},
	pages = {174-182},
	abstract = {A new physical realization of an elliptic function filter response is proposed for achieving compact size, wide bandwidth, wide spurious free stopband and high-selectivity performance. The filter configuration can be implemented in conventional waveguide technology or embedded in a multilayer low-temperature co-fired ceramic structure for integration with other circuitry in a chip module. The filter is analyzed using rigorous mode matching. To validate the concept, prototypes of four- and six-cavity elliptic filters are designed following a systematic procedure. Approximate synthesis is used to obtain initial dimensions of the filter and the desired optimum response is obtained by means of a final full-wave optimization. The results are verified with other numerical methods and with the measurements of a fourth-order waveguide filter.},
	keywords = {band-pass filters, canonical ridge waveguide filters, cavity resonator filters, ceramics, chip module, circuit optimisation, elliptic filters, elliptic function filter response, four cavity elliptic filters design, fourth order waveguide filter, full-wave optimization, metallic resonators, microwave filters, mode matching, multilayer low temperature cofired ceramic structure, multilayers, numerical methods, prototypes, resonators, ridge waveguides, six cavity elliptic filters design, spurious free stopband filter, waveguide filters band pass filters, waveguide technology},
	issn = {0018-9480},
	doi = {10.1109/TMTT.2004.839324},
	url = {http://ieeexplore.ieee.org/iel5/22/30125/01381687.pdf?tp=\&arnumber=1381687\&isnumber=30125},
	author = {J A Ruiz-Cruz and El Sabbagh, M A and Zaki, K A and Rebollar, J M and Zhang, Y}
}
@article {3_CouplingJMOEA,
	title = {Coupling Characterization and Compensation Model for Antenna Arrays},
	journal = {Journal of Microwaves, Optoelectronics and Electromagnetic Applications},
	volume = {4},
	number = {2},
	year = {2005},
	month = {Dec.},
	pages = {95-110},
	abstract = {Coupling is an important aspect to be considered in the design process of antenna arrays. The real feeding radiated coefficients can be quite different from the theoretical ones because of this effect. In this paper, a characterization and compensation model is presented. This procedure is capable of matching each element of the array. All the parameters of the array coupling model are obtained through the measurement of scattering parameters and radiation patterns of the individual elements. Some practical applications to linear patch arrays are presented.},
	issn = {1516-7399},
	url = {http://www.jmoe.org/site-number?id=3},
	author = {J L Masa-Campos and Fern{\'a}ndez, J M and Sierra-Casta{\~n}er, M and Sierra-P{\'e}rez, M}
}
@conference {03_URSIESP_Ruiz-CruzRebollar_Calculodemodos,
	title = {Calculo de modos en guias de onda mediante un metodo BCMM basado en el uso de la FFT},
	booktitle = {Proc. 2003 Simposium Nacional URSI (in Spanish)},
	year = {2003},
	month = {Sept.},
	pages = {1-4},
	abstract = {The TE and TM modes of a homogeneous cylindrical waveguide are calculated by an efficient Boundary Contour Mode-Matching Method (BCMM). The electromagnetic fields are described with a series of circular cylindrical waves whose cutoff wavenumber and amplitudes are obtained by imposing the boundary conditions. The field-matching procedure is facilitated by a new line integral extendedover the closed contour and the use of the transformation between plane and circular waves. The conversion betweenthe different field representations is carried out by means of a Fast Fourier Transform (FFT), resulting in a very efficient method.},
	url = {http://w3.iec.csic.es/ursi/articulos_coruna_2003/actas_pdf/SESION\%201/S1.\%20Aula\%202.2/1454\%20-\%20CALCULO.pdf},
	author = {J A Ruiz-Cruz and Rebollar, J M}
}
@conference {03-WT-B-StreetWCDMASystem,
	title = {On the capacity and interference statistics of street W-CDMA cross-shaped micro cells in Manhattan environment (uplink analysis)},
	booktitle = {Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual},
	volume = {1},
	year = {2003},
	month = {April},
	pages = {107-111 vol.1},
	keywords = {base station antenna pattern, Base stations, broadband networks, code division multiple access, cross-shaped microcells, Geometry, Interference, interference statistics, Manhattan environment, microcellular radio, mobile antennas, Multiaccess communication, Power control, radiofrequency interference, receiving antennas, sector capacity, sector ranges, side lobe level, statistical analysis, Statistics, Telecommunications, two slope propagation model, uplink analysis, WCDMA},
	issn = {1090-3038},
	doi = {10.1109/VETECS.2003.1207512},
	author = {Ahmed, B T and Ramon, M C and de Haro y Ariet, L}
}
@conference {03-WT-B-Air-GroundWCDMA,
	title = {On the capacity of air-ground W-CDMA system (downlink analysis)},
	booktitle = {Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual},
	volume = {1},
	year = {2003},
	month = {April},
	pages = {103-106 vol.1},
	keywords = {3-D cellular systems, aeronautical mobile radio communication, air-ground WCDMA system, Aircraft, aircraft communication, aircraft height, Base stations, broadband networks, cell radius, cellular like network, cellular radio, code division multiple access, Computer vision, Downlink, downlink capacity analysis, Interference, Land mobile radio, Mobile communication, Multiaccess communication, Propagation losses, radiofrequency interference, Telecommunication standards},
	issn = {1090-3038},
	doi = {10.1109/VETECS.2003.1207511},
	author = {Ahmed, B T and Ramon, M C and de Haro Ariet, L}
}
@article {03-WT-B-Propagation,
	title = {Comments on the hybrid model for propagation loss prediction in tunnels},
	journal = {Antennas and Propagation Magazine, IEEE},
	volume = {45},
	number = {5},
	year = {2003},
	month = {Oct},
	pages = {156-158},
	keywords = {Attenuation, Electromagnetic modeling, electromagnetic propagation, Electromagnetic waveguides, Electronic mail, Frequency, hybrid model, Microcell networks, microcellular radio, Predictive models, propagation loss prediction, Propagation losses, specific attenuation factor, Telecommunications, tunnels, UHF radio propagation, waveguide model, waveguide theory},
	issn = {1045-9243},
	doi = {10.1109/MAP.2003.1252819},
	author = {Ahmed, B T and Ramon, M C and de Haro Ariet, L}
}
@article {02-WT-B-WCDMAUplinkCapacity,
	title = {Capacity and interference statistics of highways W-CDMA cigar-shaped microcells (uplink analysis)},
	journal = {Communications Letters, IEEE},
	volume = {6},
	number = {5},
	year = {2002},
	month = {May},
	pages = {172-174},
	keywords = {Base stations, broadband networks, channel capacity, code division multiple access, highways W-CDMA cigar-shaped microcells, Interference, interference statistics, interference variance, Microcell networks, microcellular radio, mobile antennas, Multiaccess communication, multiuser channels, perfect power control, Power control, propagation exponent, radio links, radio networks, radiofrequency interference, radiowave propagation, Road transportation, rural zones, Shadow mapping, statistical analysis, Statistics, two-slope propagation model, uplink analysis},
	issn = {1089-7798},
	doi = {10.1109/4234.1001654},
	author = {Ahmed, B T and Calvo Ramon, M and de Haro Ariet, L}
}
@conference {02-WT-B-Capacityofair-groundW-CDMAsystem(uplinkanalysis,
	title = {The capacity of air-ground W-CDMA system (uplink analysis)},
	booktitle = {Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on},
	volume = {1},
	year = {2002},
	month = {Sept},
	pages = {335-338 vol.1},
	keywords = {air-ground W-CDMA system, Aircraft, Base stations, cell height, cell radius, cellular like network, cellular radio, channel capacity, code division multiple access, Computer networks, Computer vision, Electronic mail, Interference, Mobile communication, Multiaccess communication, multiuser channels, Propagation losses, radio links, Telecommunication standards, uplink analysis, uplink capacity, W-CDMA 3D air-to-ground network},
	doi = {10.1109/PIMRC.2002.1046717},
	author = {Ahmed, B T and Ramon, M C and de Haro y Ariet, L}
}
@conference {02_APS_Ruiz-CruzMontejo-GaraiRebollar_Characterisationofwaveguide,
	title = {Characterisation of waveguide discontinuities with finite wall conductivity},
	booktitle = {Proc. 2002 IEEE Antennas and Propagation Society International Symposium},
	volume = {4},
	year = {2002},
	month = {June},
	pages = {428-431},
	abstract = {In this paper, a procedure is proposed to evaluate the generalised scattering matrix of waveguide discontinuities with finite wall conductivity. This approach is applied to evaluate the insertion losses in several waveguide structures of Chebyshev bandpass filters. These numerical results are compared with those obtained with other numerical methods and with measurements, validating the proposed procedure.},
	keywords = {band-pass filters, Chebyshev filters, electromagnetic wave scattering, finite wall conductivity, generalised scattering matrix, insertion losses, numerical methods, S-matrix theory, waveguide discontinuities, waveguide filters, waveguide theory Chebyshev bandpass filters},
	issn = {0-7803-7330-8},
	doi = {10.1109/APS.2002.1017013},
	url = {http://ieeexplore.ieee.org/iel5/7931/21884/01017013.pdf?tp=\&isnumber=\&arnumber=1017013},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {01_ISS_Ruiz-CruzMontejo-GaraiRebollar_Somepropertiesof,
	title = {CAD of dual-mode filters with elliptical cavities},
	booktitle = {Proc. 11th International Travelling Summer School on Microwaves and Lightwaves},
	year = {2001},
	month = {July},
	pages = {11},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
@conference {01_EIEC_Montejo-GaraiRuiz-CruzRebollar_Comparacionentrediferentes,
	title = {Comparaci{\'o}n entre diferentes t{\'e}cnicas para el c{\'a}lculo de p{\'e}rdidas de inserci{\'o}n en filtros},
	booktitle = {Proc. II Encuentro Ib{\'e}rico de Electromagnetismo Computacional (in Spanish)},
	year = {2001},
	month = {Dec.},
	pages = {1},
	abstract = {El c{\'a}lculo de p{\'e}rdidas de inserci{\'o}n debido a la utilizaci{\'o}n de conductores reales para dispositivos pasivos de microondas en general y filtros en particular es una cuesti{\'o}n de gran importancia no s{\'o}lo te{\'o}rica, sino tambi{\'e}n pr{\'a}ctica. En particular para filtros de aplicaciones espaciales, esta especificaci{\'o}n puede llegar a ser una de las complicadas de satisfacer obligando en muchos casos a utilizar modos resonantes distintos del fundamental [1]. En este trabajo se presenta un estudio comparativo entre diferentes t{\'e}cnicas para determinar las p{\'e}rdidas y su comparaci{\'o}n con medidas experimentales. Las diferentes t{\'e}cnicas empleadas en este trabajo para su comparaci{\'o}n son: a) aproximaci{\'o}n circuital, en la que se considera simplemente la atenuaci{\'o}n del modo de resonancia del filtro [2], b) M{\'e}todo de Adaptaci{\'o}n Modal considerando las p{\'e}rdidas en los obst{\'a}culos- discontinuidades que constituyen la estructura real del filtro [3]. En esta t{\'e}cnica se considera que se satisfacen las condiciones de Leontovich en las paredes de la discontinuidad para realizar su posterior caracterizaci{\'o}n mediante GSM. c) M{\'e}todo Adaptaci{\'o}n Modal Multipuerta, propuesto en este trabajo y que considera el obst{\'a}culo-discontinuidad como nuevas gu{\'\i}as rellenas de material conductor. Se caracteriza el obst{\'a}culo mediante la Matriz de Dispersi{\'o}n Generalizada Multimodo Multipuerta y por {\'u}ltimo, d) M{\'e}todo de Elementos Finitos, haciendo uso de software comercial [4] Los resultados te{\'o}ricos de las t{\'e}cnicas enumeradas han sido comparados con medidas de diferentes filtros paso banda trabajando en las bandas X, K y Ka, y dise{\~n}ados para diferentes equipos embarcados en sat{\'e}lites. La comparaci{\'o}n realizada conduce a resultados calificables de entre curiosos y extra{\~n}os, y por el momento sin una explicaci{\'o}n que pueda considerarse satisfactoria. Todo ello, corrobora parcialmente los resultados de [3] para otras geometr{\'\i}as.},
	author = {Montejo-Garai, J R and J A Ruiz-Cruz and Rebollar, J M}
}
@conference {00_URSIESP_Ruiz-CruzRebollar_CADdeanalisis,
	title = {CAD de an{\'a}lisis de discontinuidades entre gu{\'\i}as el{\'\i}pticas y rectangulares},
	booktitle = {Proc. 2000 Simposium Nacional URSI (in Spanish)},
	year = {2000},
	month = {Sept.},
	pages = {91-92},
	abstract = {A software tool has been developed in order to analyse microwave devices in which elliptical waveguides are present. The numerical technique employed is the Mode-Matching method, which requires knowing the modal spectrum of the elliptical guide. A set of discontinuities between rectangular, circular, and elliptical waveguides is studied in order to validate the computer codes.},
	url = {http://w3.iec.csic.es/ursi/articulos_zaragoza_2000/ursi2000/trabajos/cm0267.pdf},
	author = {J A Ruiz-Cruz and Rebollar, J M}
}
