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Alex-Amor, A., G. Ptitcyn, ii, and N. Engheta,  "Kapitza-inspired stabilization of non-Foster circuits via time modulations",  \i Phys. Rev. Appl.\i0 , vol. 24: American Physical Society, pp. 024022, Aug, 2025.\par \par P\'e9rez-Escribano, M., S. Moreno-Rodr\'edguez, C. Molero, J. F. Valenzuela-Vald\'e9s, P. Padilla, and A. Alex-Amor,  "Analytical Framework to Model Reconfigurable Metasurfaces Including Lumped Elements",  \i IEEE Transactions on Circuits and Systems II: Express Briefs\i0 , vol. 71, no. 4, pp. 1784-1788, 2024.\par \par Ram\'edrez-Arroyo, A., A. Alex-Amor, R. Medina, P. Padilla, and J. F. Valenzuela-Vald\'e9s,  "Joint Ultra-Wideband Characterization of Azimuth, Elevation, and Time of Arrival With Toric Arrays",  \i IEEE Transactions on Wireless Communications\i0 , vol. 23, no. 9, pp. 10990-11000, 2024.\par \par Moreno-Rodr\'edguez, S., A. Alex-Amor, P. Padilla, J. F. Valenzuela-Vald\'e9s, and C. Molero,  "Space-time metallic metasurfaces for frequency conversion and beamforming",  \i Phys. Rev. Appl.\i0 , vol. 21: American Physical Society, pp. 064018, Jun, 2024.\par \par Alex-Amor, A., S. Moreno-Rodr\'edguez, P. Padilla, J. F. Valenzuela-Vald\'e9s, and C. Molero,  "Analytical equivalent circuits for three-dimensional metamaterials and metagratings",  \i Phys. Rev. Appl.\i0 , vol. 20: American Physical Society, pp. 044010, Oct, 2023.\par \par Alex-Amor, A., S. Moreno-Rodr\'edguez, P. Padilla, J. F. Valenzuela-Vald\'e9s, and C. Molero,  "Diffraction Phenomena in Time-Varying Metal-Based Metasurfaces",  \i Phys. Rev. Appl.\i0 , vol. 19: American Physical Society, pp. 044014, Apr, 2023.\par \par Ram\'edrez-Arroyo, A., A. Alex-Amor, P. Padilla, and J. F. Valenzuela-Vald\'e9s,  "Joint Direction-of-Arrival and Time-of-Arrival Estimation With Ultra-Wideband Elliptical Arrays",  \i IEEE Transactions on Wireless Communications\i0 , vol. 22, no. 12, pp. 9187-9200, 2023.\par \par Moreno-Rodr\'edguez, S., A. Alex-Amor, P. Padilla, J. F. Valenzuela-Vald\'e9s, and C. Molero,  "Time-Periodic Metallic Metamaterials Defined by Floquet Circuits",  \i IEEE Access\i0 , vol. 11, pp. 116665-116673, 2023.\par \par Polo-Lopez, L., J. L. Masa-Campos, A. T. Muriel-Barrado, P. Sanchez-Olivares, E. Garcia-Marin, J. C\'f3rcoles, and J. A. Ruiz-Cruz,  "Mechanically Reconfigurable Linear Phased Array Antenna Based on Single-Block Waveguide Reflective Phase Shifters With Tuning Screws",  \i IEEE Access\i0 , vol. 8, pp. 113487-113497, 2020.\par \par Polo-Lopez, L.., J. C\'f3rcoles, and J.A.. Ruiz-Cruz,  "Modal Field Synthesis of Monopulse Difference Patterns for Radiating Aperture",  \i IEEE Transactions on Antennas and Propagation\i0 , vol. 68, no. 12, pp. 8203-8208, 2020.\par \par Polo-Lopez, L.., J. C\'f3rcoles, and J.A.. Ruiz-Cruz,  "Analytical far-zone calculation of the field radiated from an equilateral triangular aperture",  \i IEEE Transactions on Antennas and Propagation\i0 , vol. 67, no. 8, pp. 5668-5672, 2019.\par \par Polo-Lopez, L., J. L. Masa-Campos, and J. A. Ruiz-Cruz,  "Reconfigurable H-plane waveguide phase shifters prototyping with additive manufacturing at K-band",  \i International Journal of RF and Microwave Computer-Aided Engineering\i0 , vol. 29, no. 12, pp. e21980, 2019.\par \par Polo-Lopez, L.., J. C\'f3rcoles, J.A.. Ruiz-Cruz, J.R.. Montejo-Garai, and J.M.. Rebollar,  "On the Theoretical Maximum Directivity of a Radiating Aperture from Modal Field Expansions",  \i IEEE Transactions on Antennas and Propagation\i0 , vol. 67, no. 4, pp. 2781-2786, 2019.\par \par Polo-Lopez, L.., J. C\'f3rcoles, and J.A.. Ruiz-Cruz,  "Antenna design by means of the fruit fly optimization algorithm",  \i Electronics (Switzerland)\i0 , vol. 7, no. 1, 2018.\par \par Polo-Lopez, L.., G.. Pisano, J.A.. Ruiz-Cruz, and J. C\'f3rcoles,  "A Compact Lenslet as an Alternative to Corrugated Horns for Astronomy Applications",  \i 2018 48th European Microwave Conference, EuMC 2018\i0 , pp. 424-427, 2018.\par \par Polo-L\'f3pez, L., J. C\'f3rcoles, and J. A. Ruiz-Cruz,  "Fruit fly optimization algorithm for passive waveguide devices",  \i Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO), 2017 IEEE MTT-S International Conference on\i0 : IEEE, pp. 43?45, 2017.\par \par Polo-Lopez, L., J. A. Ruiz-Cruz, J. R. Montejo-Garai, and J. M. Rebollar-Machain,  "An\'e1lisis de discontinuidades en gu\'eda de onda con condiciones de contorno de pared magn\'e9tica perfecta laterales y transversales",  \i Simposium Nacional URSI 2016\i0 , September, 2016.\par \par Polo-Lopez, L., J. A. Ruiz-Cruz, J. C\'f3rcoles, and C. A. Leal-Sevillano,  "Analysis and design of horn antennas with arbitrary profile using mode-matching",  \i Congress on Numerical Methods in Engineering, CMN 2015\i0 , July, 2015.\par \par Taha-Ahmed, B., J. C\'f3rcoles-Ortega, R. V. Haro-Baez, C. A. Leal-Sevillano, J. L. Masa-Campos, J. R. Montejo-Garai, E. Garcia-Marin, A. Mor\'e1n-L\'f3pez, L. Polo-Lopez, J. M. Rebollar-Machain, et al.,  "Desarrollo de componentes pasivos con divisi\'f3n/combinaci\'f3n de potencia para sistemas de comunicaciones",  \i Simposium Nacional URSI 2015\i0 , September, 2015.\par \par Masa-Campos, J. L., J. A. Ruiz-Cruz, J. C\'f3rcoles-Ortega, B. Taha-Ahmed, P. Sanchez-Olivares, and P. Pascual-Garcia,  "Antenas planas con redes de alimentaci\'f3n de bajas p\'e9rdidas y control de apuntamiento para aplicaciones de defensa y seguridad",  \i Congreso Nacional de I+D en Defensa y Seguridad\i0 , pp. 1-8, Nov, 2013.\par \par Pontes, J., J. C\'f3rcoles, M. A. Gonz\'e1lez, and T. Zwick,  "Modal Network Model for MIMO Antenna in-System Optimization",  \i IEEE Transactions on Antennas and Propagation\i0 , vol. 59, no. 2, pp. 643-653, Feb, 2011.\par \par Zhang, Y., J. A. Ruiz-Cruz, K. A. Zaki, and A. J. Piloto,  "A Waveguide to Microstrip Inline Transition With Very Simple Modular Assembly",  \i IEEE Microwave and Wireless Components Letters\i0 , vol. 20, no. 9, pp. 480-482, Sept., 2010.\par \par C\'f3rcoles, J., J. Pontes, M. A. Gonz\'e1lez, and T. Zwick,  "Modelling line-of-sight coupled MIMO systems with generalised scattering matrices and spherical wave translations",  \i Electronics Letters\i0 , vol. 45, no. 12, pp. 598-599, June, 2009.\par \par Ruiz-Cruz, J. A., Y. Zhang, J. M. Rebollar, K. A. Zaki, J. R. Montejo-Garai, and A. J. Piloto,  "TEM Mode-Matching Analysis of Multi-coupled Strip-line Filters",  \i 2007 IEEE MTT-S International Microwave Symposium Digest\i0 , pp. 541-544, June, 2007.\par \par Ruiz-Cruz, J. A., Y. Zhang, K. A. Zaki, A. J. Piloto, and J. Tallo,  "Ultra-Wideband LTCC Ridge Waveguide Filters",  \i IEEE Microwave and Wireless Components Letters\i0 , vol. 17, no. 2, pp. 115-117, Feb., 2007.\par \par Montejo-Garai, J. R., J. A. Ruiz-Cruz, J. M. Rebollar, A.. Onoro-Navarro, I. Hidalgo-Carpintero, and M. J. Padilla-Cruz,  "Design of Self-Equalised Elliptic Filter Channels in Ka-Band Implemented in Rectangular H-Plane Waveguide",  \i Proc. 36th European Microwave Conference\i0 , pp. 1087-1090, Sept., 2006.\par \par Fahmi, M. M., J. A. Ruiz-Cruz, K. A. Zaki, and A. J. Piloto,  "LTCC wide-band canonical ridge waveguide filters",  \i 2005 IEEE MTT-S International Microwave Symposium Digest\i0 , pp. 249-252, June, 2005.\par \par Ruiz-Cruz, J. A., Y. Zhang, K. A. Zaki, A. J. Piloto, and J. M. Rebollar,  "Ridge waveguide branch-line directional couplers for wideband applications and LTCC technology",  \i 2005 IEEE MTT-S International Microwave Symposium Digest\i0 , pp. 1219-1222, June, 2005.\par \par Montejo-Garai, J. R., J. A. Ruiz-Cruz, J. M. Rebollar, M. J. Padilla-Cruz, A. Onoro-Navarro, and I. Hidalgo-Carpintero,  "Synthesis and design of in-line N-order filters with N real transmission zeros by means of extracted poles implemented in low-cost rectangular H-plane waveguide",  \i IEEE Transactions on Microwave Theory and Techniques\i0 , vol. 53, no. 5, pp. 1636-1642, May, 2005.\par \par Montejo-Garai, J. R., J. A. Ruiz-Cruz, J. M. Rebollar, M. J. Padilla-Cruz, and O-N. A. I Hidalgo-Carpintero,  "High power-low loss band pass rectangular waveguide H-plane filters with finite real frequency transmission zeros",  \i Proc. 2004 Int. Workshop on Microwave Filters CNES-ESA\i0 , pp. 1-2, Sept., 2004.\par \par Page, J. E., P. Crespo-Valero, and J. A. Ruiz-Cruz,  "Modelos circuitales para discontinuidades en gu\'edas de ondas: obtenci\'f3n y uso en dise\'f1o",  \i Proc. II Encuentro Ib\'e9rico de Electromagnetismo Computacional (in Spanish)\i0 , pp. 1, Dec., 2001.\par \par }