@conference {Corcoles2019,
	title = {Algorithmic Implementation of a Hybrid 2D Finite Element - Mode Matching Method Based on Nested Function Spaces},
	booktitle = {13th European Conference on Antennas and Propagation, EuCAP 2019},
	year = {2019},
	note = {cited By 0},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068440453\&partnerID=40\&md5=4166d8f9ade7f9b3b987f47673f5a9f1},
	author = {J C{\'o}rcoles and Ruiz-Cruz, J.A. and Haro-Baez, R.V.}
}
@article {Mor{\'a}n-L{\'o}pez2019944,
	title = {Analytical expressions of the Q-factor for the complete resonant mode spectrum of the equilateral triangular waveguide cavity},
	journal = {Electronics Letters},
	volume = {55},
	number = {17},
	year = {2019},
	note = {cited By 0},
	pages = {944-947},
	doi = {10.1049/el.2019.1420},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070995669\&doi=10.1049\%2fel.2019.1420\&partnerID=40\&md5=19090b75e53bc347286c215ec3e93256},
	author = {Mor{\'a}n-L{\'o}pez, A. and Ruiz-Cruz, J.A. and J C{\'o}rcoles and Montejo-Garai, J.R. and Rebollar, J.M.}
}
@article {Polo-Lopez20195668,
	title = {Analytical far-zone calculation of the field radiated from an equilateral triangular aperture},
	journal = {IEEE Transactions on Antennas and Propagation},
	volume = {67},
	number = {8},
	year = {2019},
	note = {cited By 0},
	pages = {5668-5672},
	doi = {10.1109/TAP.2019.2921201},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070602324\&doi=10.1109\%2fTAP.2019.2921201\&partnerID=40\&md5=7f430a825535a5277bb5c13267bcadf9},
	author = {Polo-Lopez, L. and J C{\'o}rcoles and Ruiz-Cruz, J.A.}
}
@article {Polo-L{\'o}pez2018,
	title = {Antenna design by means of the fruit fly optimization algorithm},
	journal = {Electronics (Switzerland)},
	volume = {7},
	number = {1},
	year = {2018},
	note = {cited By 7},
	doi = {10.3390/electronics7010003},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85040905992\&doi=10.3390\%2felectronics7010003\&partnerID=40\&md5=caefda0eb7b9eff97a553b194ea230b0},
	author = {Polo-Lopez, L. and J C{\'o}rcoles and Ruiz-Cruz, J.A.}
}
@conference {16_URSI_PABLO-SANCHEZ_conformalarray_omni,
	title = {Agrupaci{\'o}n Conformada con Alimentaci{\'o}n en Gu{\'\i}a de Onda Radial para Cobertura Omnidireccional en Banda Ku},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {A conformal array antenna fed by a radial waveguide divider has been designed in order to obtain an omnidirectional performance at Ku band. The single radiating elements consist on a waveguide ended on a cavity-slot and they have been placed on the regular prism faces conforming the final antenna shape. The array dimensions as well as the number of faces have been optimized to generate a maximum ripple in the omnidirectional pattern, obtaining an eight-faced regular prism antenna with an apothem of 20.6 mm. The single radiating elements are fed by an equal power eight-way radial waveguide divider. The use of waveguide technology makes the structure suitable for high power applications. The conformal array 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, a total efficiency of 98.8\% and an input matching bandwidth of 11.7\% has been measured.},
	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 {16_URSI_EDUARDO-GARCIA_4by4patcharray,
	title = {Agrupaci{\'o}n plana de parches apilados con alimentaci{\'o}n corporativa en tecnolog{\'\i}a mixta SIW-microstrip para banda Ku},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {A 4 x 4 linearly-polarized stacked-patch array with a fully corporate feeding network for Ku-band is presented in its work. Antenna replication in larger arrays is straightforward with this corporate approach, which in addition prevents unintended main beam steering. The feeding structure is divided in two levels, where the first power distribution is made in Substrate Integrated Waveguide and the second in microstrip technology. This procedure takes advantage of the strengths of each technology, combining waveguide low losses with microstrip versatility. A 18.6-dBi gain is attained in simulation with matching better than -14 dB in the entire bandwidth.},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {16_URSI_LUCAS-POLO_horn_PEW_PMW,
	title = {An{\'a}lisis de discontinuidades en gu{\'\i}a de onda con condiciones de contorno de pared magn{\'e}tica perfecta laterales y transversales},
	booktitle = {Simposium Nacional URSI 2016},
	year = {2016},
	month = {September},
	abstract = {This contribution presents the analysis of waveguide problems involving general boundary conditions of perfect magnetic wall. This type of boundary condition, when the waveguide device under analysis has physical symmetry, is used very commonly to speed up the computation time in general waveguide solvers by exploiting the symmetries of the excitation. This contribution is focused on extending its use in general problems having this type of boundary condition in the lateral and transverse walls, applying the mode-matching method. The formulation will be applied to classical waveguide devices surrounded by perfect magnetic walls, but also to simulate radiating problems. The simulation results will be compared with those obtained by other numerical techniques (based on different solvers) to test the validity of the presented formulation.},
	author = {L Polo-Lopez and J A Ruiz-Cruz and J R Montejo-Garai and J M Rebollar-Machain}
}
@conference {15_URSI_EDUARDO-GARCIA_patcharray2x2,
	title = {Agrupaci{\'o}n Plana de Doble Parche Apilado con Alimentaci{\'o}n Corporativa sobre SIW},
	booktitle = {Simposium Nacional URSI 2015},
	year = {2015},
	month = {September},
	abstract = {In this work, a planar stacked patch array for Ku band fed by a fully corporate Substrate Integrated Waveguide network is proposed. Corporate topology prevents an unintended main beam steering effect that reduces the antenna bandwidth in progressive wave structures. Nevertheless, an increase in the spacing between radiating elements occurs, worsening the Side- Lobe Level figure. A reduction in such spacing implies closer discontinuities, namely bends and power dividers, and thus reflection coefficient is degraded. Therefore, a tradeoff solution is presented, where a measured Side-Lobe Level better that -11 dB and 4.1\% reflection bandwidth are achieved, showing good agreement with the simulated results. A measured gain of 13.27 dBi is attained, corresponding to an 86\% radiation efficiency.},
	author = {E Garcia-Marin and J L Masa-Campos and P Sanchez-Olivares}
}
@conference {15_CNM_Polo_hornmodematching,
	title = {Analysis and design of horn antennas with arbitrary profile using mode-matching},
	booktitle = {Congress on Numerical Methods in Engineering, CMN 2015},
	year = {2015},
	month = {July},
	author = {L Polo-Lopez and J A Ruiz-Cruz and J C{\'o}rcoles and C A Leal-Sevillano}
}
@article {15_TAP_Rubio_ThinningOMP,
	title = {Array Thinning of Coupled Antennas Based on the Orthogonal Matching Pursuit Method and a Spherical-Wave Expansion for Far-Field Synthesis},
	journal = {Antennas and Propagation, IEEE Transactions on},
	volume = {63},
	number = {12},
	year = {2015},
	month = {Dec},
	pages = {5425-5432},
	abstract = {This work is focused on the array thinning problem in shaped beam far-field synthesis. The orthogonal matching pursuit algorithm, which allows finding sparse solutions in linear systems, is combined with a fast full-wave analysis method for antenna arrays based on a spherical wave expansion, thereby taking mutual coupling between real antennas into account in the thinning process. To this aim, the original iterative algorithm is modified so that the current residual is obtained for the selected real coupled antennas in each step of the algorithm. In this way, the remaining nonselected elements are effectively removed instead of turned off. Results for arrays made up of microstrip patch antennas and dielectric resonator antennas arranged in triangular and rectangular lattices are presented.},
	keywords = {Antenna arrays, array thinning problem, Arrays, coupled antennas, dielectric resonator antennas, far-field synthesis, fast full-wave analysis method, generalized scattering matrix, iterative algorithm, iterative methods, Layout, linear systems, Matching pursuit algorithms, microstrip antenna arrays, microstrip patch antennas, Mutual coupling, orthogonal matching pursuit method, pattern field synthesis, planar array, rectangular lattices, spherical wave expansion, spherical-wave expansion, translational addition theorems, Transmission line matrix methods, triangular lattices},
	issn = {0018-926X},
	doi = {10.1109/TAP.2015.2487506},
	author = {J Rubio and J C{\'o}rcoles and J F Izquierdo and R G{\'o}mez-Alcal{\'a}}
}
@conference {13_DESE_Masa-CamposRuiz-CruzCorcoles-OrtegaEtAl_AntenasplanasBajasPerdidas,
	title = {Antenas planas con redes de alimentaci{\'o}n de bajas p{\'e}rdidas y control de apuntamiento para aplicaciones de defensa y seguridad},
	booktitle = {Congreso Nacional de I+D en Defensa y Seguridad},
	year = {2013},
	month = {Nov},
	pages = {1-8},
	abstract = {En el presente art{\'\i}culo se presentan distintas opciones de antenas de bajo perfil, bajas p{\'e}rdidas y apuntamiento variable seg{\'u}n la banda de operaci{\'o}n de los sistemas de defensa y seguridad. Empezando por las antenas enteramente en tecnolog{\'\i}a impresa, pasando por las gu{\'\i}as de onda sobre sustrato y las gu{\'\i}as de ondas met{\'a}licas, los dise{\~n}os mostrados ofrecen un buen rendimiento en ganancia adecuado a la banda de frecuencias. Varios prototipos han sido implementados y testeados en banda S, X y Ku para validar las ideas planteadas.},
	author = {J L Masa-Campos and J A Ruiz-Cruz and J C{\'o}rcoles-Ortega and B Taha-Ahmed and P Sanchez-Olivares and P Pascual-Garcia}
}
@conference {09_EuCAP_Corcoles,
	title = {Array design for different SLL and null directions with an interior-point optimization method from the generalized-scattering-matrix and spherical modes},
	booktitle = {Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on},
	year = {2009},
	month = {March},
	pages = {1381-1385},
	abstract = {This paper presents a pattern synthesis technique for arbitrary planar arrays which can be characterized in terms of a generalized-scattering-matrix (GSM) and whose radiated field can be expressed as a spherical mode expansion (SME). The procedure yields the complex-valued excitations needed to achieve a pattern which fulfils the requirements of different sidelobe levels in different regions and several prescribed field nulls with a maximum directive gain. The formulation is based on matrix-valued functions which are computed from the GSM and the SME, so all interelement coupling effects coming from complex radiating structures used as array elements are inherently taken into account. To solve the resulting nonlinear optimization problem, a primal-dual interior-point filtering method specifically adapted to this formulation is developed. Numerical results are presented for arrays of microstrip patch antennas and dielectric resonator antennas.},
	keywords = {antenna pattern, antenna radiation patterns, antenna sidelobe level, dielectric resonator antenna, dielectric resonator antennas, electromagnetic coupling, Filtering, filtering theory, generalized scattering matrix, generalized-scattering-matrix, GSM, Hessian matrices, interelement coupling effect, interior-point optimization method, Jacobian matrices, microstrip antenna arrays, Microstrip antennas, microstrip patch antenna, Microstrip resonators, nonlinear optimization, optimisation, Optimization methods, pattern synthesis technique, planar antenna array, planar antenna arrays, Planar arrays, primal-dual interior-point filtering method, Resonator filters, S-matrix theory, spherical, spherical mode expansion, Transmission line matrix methods, wave expansion},
	url = {http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=\&arnumber=5067872},
	author = {J C{\'o}rcoles and Gonz{\'a}lez, M A and Rubio, J and Zapata, J}
}
@article {08_MwJournal_Ruiz-CruzWangZaki_AdvancesMicrowaveFilterDesign,
	title = {Advances in Microwave Filter Design Techniques},
	journal = {Microwave Journal},
	volume = {51},
	number = {11},
	year = {2008},
	month = {November},
	pages = {26-44},
	issn = {0192-6225},
	url = {http://www.mwjournal.com/Journal/article.asp?HH_ID=AR_6783},
	author = {J A Ruiz-Cruz and Wang, C and Zaki, K A}
}
@conference {07_IMS_ZhangZakiRuiz-CruzEtAl_AnalyticalSynthesisof,
	title = {Analytical Synthesis of Generalized Multi-band Microwave Filters},
	booktitle = {2007 IEEE MTT-S International Microwave Symposium Digest},
	year = {2007},
	month = {June},
	pages = {1273-1276},
	abstract = {An analytical procedure is presented for the synthesis of generalized multi-band filters. The procedure is applicable to both symmetric and asymmetric frequency responses and effective for any number of passbands and stopbands. An optimum equal-ripple performance is obtained in each passband and stopband. Prescribed real or complex transmission zeros can also be employed in the multi-band filtering function.},
	keywords = {band-pass filters, band-stop filters, generalized multiband microwave filters, microwave filtersfrequency responses, optimum equal-ripple performance, passbands, stopbands},
	issn = {0149-645X},
	doi = {10.1109/MWSYM.2007.380425},
	url = {http://ieeexplore.ieee.org/iel5/4263706/4263707/04264064.pdf?tp=\&isnumber=\&arnumber=4264064},
	author = {Zhang, Y and Zaki, K A and J A Ruiz-Cruz and Atia, A E}
}
@conference {05_URSIUSA_Ruiz-CruzGentiliRebollar_Analysisofwaveguide,
	title = {Analysis of waveguide junctions by the Boundary Contour Mode-Matching Method with segmented regions},
	booktitle = {Proc. 2005 USNC/URSI National Radio Science Meeting},
	year = {2005},
	month = {July},
	pages = {1},
	abstract = {The Boundary Contour Mode-Matching method (BCMM) allows the analysis of homogeneous waveguide junctions. The basic building block of this method is an E- or H-plane structure with arbitrary contour, excited by several rectangular waveguides (the ports). The electromagnetic field inside the junction is expanded in basic solutions of the Maxwell equations as, for instance, circular waves (J.M Reiter et al., IEEE TMTT, 796-801, April 1995). In the ports, a modal series is used. The boundary conditions are imposed by means of a Galerkin method that relates the two different field expansions and leads to the Generalized Scattering Matrix (GSM) of the junction. Different improvements have been made to the method as (R. H MacPhie et al., IEEE TMTT, 232-237, Feb. 1999) and (J A Ruiz-Cruz et. al, IEE Microw. Ant. and Prop., 332-338, Oct. 2003), oriented to speed up the computation of the Galerkin method matrices. The technique has been successfully applied to different types of structures as arbitrary bends (circular, mitered,..), cavities with rounded corners and Y-junctions. In comparison with other quasi-analytical methods, this technique does not require to characterize the eigenfunctions of the junction. However, when ridged zones appear in the contour of the problem (for instance a bend with a matching element), the BCMM linear system is not well conditioned and convergent results are difficult to achieve. The aim of this contribution is to overcome the limitations of the ridged zones by means of segmenting the junction under analysis in regions which can be successfully analyzed by the BCMM. The trivial case is when the problem can be divided in two or more basic building blocks linked by waveguide ports, which can be solved by cascading the GSM of each separate block. This contribution will focus on structures, like a T-junction with an inner ridge zone, where the trivial case can not be applied and the segmented regions must be considered all together in the field-matching procedure. The formulation will use three type of expansions: a) a dedicated expansion for representing the electromagnetic field in each segmented region, b) the modal series in the ports, c) a series to describe the electric field at the interface between regions. All the amplitudes of the expansions are linked by the boundary conditions at the interfaces. A Galerkin method will provide the GSM of the junction. The results of the investigated problems will be shown in the oral presentation.},
	author = {J A Ruiz-Cruz and Gentili, G G and Rebollar, J M}
}
@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}
}
@conference {03_URSIUSA_Ruiz-CruzRebollar_alternativeinterpretationof,
	title = {An alternative interpretation of resonance of two-aperture irises in rectangular waveguide},
	booktitle = {Proc. 2003 USNC/URSI National Radio Science Meeting},
	year = {2003},
	month = {June},
	pages = {226},
	abstract = {The multiple aperture irises present some interest for the design of low cost bandpass filters with some improved stopband attenuation. Approximate estimation of the rejection resonance position based on circuit theory modelling, joint to a circuital interpretation was proposed by (N G Paterson, Electron Lett, 592-594, 1976). An accurate electromagnetic estimation of such rejection resonance was presented at (R. Yang, IEEE Trans. MTT, 1369-1373, 1993). An interpretation of the nature of this resonance for two-aperture in terms of a pair of natural oscillations in the open-waveguide type structure was presented at (A A Kirilenko, IEEE Trans. MTT, 1419-1421, 2000). Application for a new type of bandstop filter with three-aperture irises was presented at (L. Mospan, VIII Int. Conf. MMET, 503-505, 2000). In this paper, we present and alternative interpretation of resonance of two-apertures iris in terms of the excitation of the TEM mode of the structure. The mentioned TEM mode considers the strip between the two irises as one conductor and the wide walls of rectangular waveguide as the second conductor of the transmission line. This transmission line is short-circuited at both ends and its total length is approximately the wide of the iris. An accurate fullwave electromagnetic simulation joint to a visualisation of the electric and magnetic field vectors in the structure are employed to discuss and validate this interpretation. We consider that this alternative interpretation is very simple and useful from the designer point of view, specially to prevent spurious resonance in a variety of devices that use the mentioned multi-aperture iris structure. Quantitative results of resonance frequency positions and field plots at these frequency points for different structures will be presented.},
	author = {J A Ruiz-Cruz and Rebollar, J M}
}
@conference {02_URSIESP_Ruiz-CruzRebollar_Analisisdeuniones,
	title = {An{\'a}lisis de uniones en gu{\'\i}a de onda plano E y H mediante el m{\'e}todo BCMM y el uso de la FFT},
	booktitle = {Proc. 2002 Simposium Nacional URSI (in Spanish)},
	year = {2002},
	month = {Sept.},
	pages = {519-520},
	abstract = {The Boundary Contour Mode-Matching Method (BCMM) is applied to the analysis of H- and E- plane junctions with planar and circular boundaries. The proposed approach is based on the use of the Fast Fourier Transform (FFT) to improve an analytical BCMM method, increasing notably the efficiency of the technique. The presented formulation is verified by comparing simulated results with those obtained by other numerical techniques.},
	url = {http://w3.iec.csic.es/ursi/articulos_alcalahenares_2002/sesiones/sesion6.pdf},
	author = {J A Ruiz-Cruz and Rebollar, J M}
}
