@article {15_TAP_Corcoles_RLAQCQP,
	title = {Reactively Loaded Array Pattern Synthesis as a Quadratically Constrained Quadratic Program},
	journal = {Antennas and Propagation, IEEE Transactions on},
	volume = {63},
	number = {11},
	year = {2015},
	month = {Nov},
	pages = {5219-5224},
	abstract = {The pattern synthesis problem of maximizing the gain at a scanning direction subject to a maximum sidelobe level for a reactively loaded antenna array is formulated as a quadratically constrained quadratic program (QCQP). This formulation is derived from the scattering matrix and the active element patterns of the array considering both fed and loaded antennas as ports. Since the resulting QCQP is nonconvex, the loads are computed from the solution of the semidefinite relaxation of the problem by forcing the feasibility of the constraints in a meaningful physical sense, i.e., by explicitly imposing passive or purely reactive loads. Numerical results of dipole arrays with various configurations are presented and compared to previous works.},
	keywords = {Antenna arrays, Antenna pattern synthesis, antenna radiation patterns, Arrays, dipole antenna arrays, dipole array, Gain, Loaded antennas, optimization, Optimization methods, Ports (Computers), QCQP, quadratic programming, quadratically constrained quadratic program, reactively loaded array pattern synthesis, reconfigurable antennas, S-matrix theory, scattering matrix, semidefinite (SD) programming, semidefinite programming, semidefinite relaxation, sidelobe level, sidelobe supression},
	issn = {0018-926X},
	doi = {10.1109/TAP.2015.2478487},
	author = {J C{\'o}rcoles}
}
@article {12_TAP_Corcoles_CombinedArrayThinning,
	title = {Efficient Combined Array Thinning and Weighting for Pattern Synthesis With a Nested Optimization Scheme},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {60},
	number = {11},
	year = {2012},
	month = {Nov},
	pages = {5107-5117},
	abstract = {A novel procedure to thin an antenna array which synthesizes a desired pattern with the minimum number of active elements is introduced. The proposed method yields both the active elements and their corresponding excitations of a thinned array having the minimum number of active elements needed to meet several prescribed design specifications of the radiated far-field pattern. Specifications such as achieving a minimum gain, obtaining a pattern with a maximum allowable sidelobe level or synthesizing a shaped beam pattern confined into a mask are considered. Null field directions can also be added. In order to carry out the thinning, a genetic algorithm is used, while computing the excitations is carried out through linear or quadratic programming. The procedure incorporates the generalized scattering matrix analysis of an array made up of elements whose radiated field can be expressed as a spherical mode expansion, thus taking all electromagnetic effects inherently into account. Therefore, since the presence of an element can substantially alter the array features because of mutual coupling, two types of thinning are considered: removing elements or turning them off. Numerical results of arrays made up of isotropic sources, dielectric resonator antennas and microstrip patch antennas are presented.},
	keywords = {Antenna arrays, Arrays, generalized scattering matrix, Genetic algorithms, genetic algorithms (GAs), GSM, linear programming, optimization, quadratic programming (QP), spherical wave expansion, thinned arrays, Transmission line matrix methods, Vectors},
	issn = {0018-926X},
	doi = {10.1109/TAP.2012.2207667},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=6236035},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A}
}
@conference {12_ICEAA_Montejo-GaraiLeal-SevillanoRuiz-CruzEtAl_SymmetricalResponseFilterBartlett,
	title = {Symmetrical Response Filter Design Applying the Bartlett{\^a}{\texteuro}{\texttrademark}s Theorem and Using Riblet{\^a}{\texteuro}{\texttrademark}s Couplers},
	booktitle = {Proc. International Conference on Electromagnetics in Advanced Applications (ICEAA)},
	year = {2012},
	month = {Sep.},
	pages = {1-4},
	keywords = {corrugated waveguide, dual-band, mode-matching, optimization, Waveguide polarizers},
	author = {Montejo-Garai, J R and C A Leal-Sevillano and J A Ruiz-Cruz 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_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}
}
@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 {08_IJRFMiCAE_FahmiRuiz-CruzZaki_EandH-plane,
	title = {E and H-plane wide-band ridge waveguide couplers},
	journal = {International Journal of RF and Microwave Computer-Aided Engineering},
	volume = {18},
	number = {4},
	year = {2008},
	month = {July},
	pages = {348-358},
	abstract = {A systematic synthesis procedure for ridge waveguide branch line couplers in both E-plane and H-plane configurations is presented. Ridge waveguides are chosen to benefit from their wide mono-mode band and compact size compared to rectangular waveguides. Equivalent circuit parameters are used to synthesize the coupler sections. Rigorous mode matching method is used for full-wave analysis and optimization of the couplers. Ridge couplers both in empty waveguide and Low Temperature Co-fired Ceramic "LTCC" technology are designed using the proposed method and the design is verified with another numerical method. A prototype is built and its response is measured to verify the approach},
	keywords = {full-wave, LTCC, mode matching, optimization, ridge waveguide},
	issn = {1096-4290},
	doi = {10.1002/mmce.20293},
	url = {http://www3.interscience.wiley.com/cgi-bin/fulltext/119140987/PDFSTART},
	author = {Fahmi, M M and J A Ruiz-Cruz and Zaki, K A}
}
@article {04_WSEAS_Ruiz-CruzMontejo-GaraiRebollar_Applicationofsimulated,
	title = {Application of the simulated annealing for waveguide filters with complicated frequency response},
	journal = {WSEAS Transactions on Mathematics},
	volume = {3},
	number = {4},
	year = {2004},
	note = {Acceptance Rate = (Number of Accepted Papers) / (Number of Submitted Papers) *100 = 13.45\%, SCImago: 0.039},
	month = {Oct.},
	pages = {807-812},
	abstract = {A design approach for microwave waveguide filters with complicated response is proposed. It uses a combination of analytical filter synthesis theory, a very efficient"fullwave" analysis method of the structure and the Simulated Annealing (SA) optimization algorithm. Instead of a single optimization of the whole structure, the knowledge of the analytical synthesis of the filter allows todivide the optimization into more straightforward partial problems. In this way, the filter is segmented into sections that are optimized to match the partial frequency responses obtained from the analytical synthesis procedure. These optimized sections are a very useful starting point to overcome the difficulties of the final optimization of the whole structure. These ideas areapplied to the design of two waveguide filters with sophisticated response. The obtained results show the efficiency of the presented approach.},
	keywords = {microwave waveguide filters, optimization, simulated annealing., synthesis theory},
	issn = {1109-2769},
	url = {http://www.worldses.org/journals/mathematics/mathematics-october2004.doc},
	author = {J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M}
}
