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[EN] The objective of this paper is to describe the design of an innovative and low-cost diplexer for Ka-band multi-beam satellite applications. The device is based on the use of two quadruplets to implement a number of transmission zeros (TZs) thus obtaining high-selectivity quasi-elliptic transfer functions. The resulting diplexer structure is particularly flexible in terms of layout, does not require tuning and has an excellent high-power behavior. In addition to theory, we compare the results of our simulations with the measurements obtained with a manufactured breadboard. The comparison shows excellent agreement thereby fully validating both the design procedure, and the new diplexer structure. ; This work was supported in part by the MINECO (Spanish Government) through Research and Development Project under Grant TEC2016-75934-C4-1-R, and in part by the Research and Development Technicians under Grant PTA2015-10839-I. ; Ossorio García, J.; Melgarejo Lermas, JC.; Cogollos, S.; Boria Esbert, VE.; Guglielmi, M. (2020). Waveguide Quadruplet Diplexer for Multi-Beam Satellite Applications. IEEE Access. 8:110116-110128. https://doi.org/10.1109/ACCESS.2020.3002818 ; S ; 110116 ; 110128 ; 8

110116 110128 8 ; S ; [EN] The objective of this paper is to describe the design of an innovative and low-cost diplexer for Ka-band multi-beam satellite applications. The device is based on the use of two quadruplets to implement a number of transmission zeros (TZs) thus obtaining high-selectivity quasi-elliptic transfer functions. The resulting diplexer structure is particularly flexible in terms of layout, does not require tuning and has an excellent high-power behavior. In addition to theory, we compare the results of our simulations with the measurements obtained with a manufactured breadboard. The comparison shows excellent agreement thereby fully validating both the design procedure, and the new diplexer structure. This work was supported in part by the MINECO (Spanish Government) through Research and Development Project under Grant TEC2016-75934-C4-1-R, and in part by the Research and Development Technicians under Grant PTA2015-10839-I. ; Ossorio García, J.; Melgarejo Lermas, JC.; Cogollos, S.; Boria Esbert, VE.; Guglielmi, M. (2020). Waveguide Quadruplet Diplexer for Multi-Beam Satellite Applications. IEEE Access. 8:110116-110128. https://doi.org/10.1109/ACCESS.2020.3002818

© 2018 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. ; [EN] The objective of this paper is to advance the state of the art of aggressive space mapping (ASM) by demonstrating how, for resonant structures, and microwave filters in particular, an ASM-based optimization procedure may converge to the desired target performance in just one step. This behavior is first justifed in physical terms, using the electromagnetic cavity perturbation theory, and is then investigated numerically. Several practical filter design demonstrations are also presented. This paper is concluded with a conceptual definition of Space Alignment in the context of ASM. ; This work was supported by MINECO (Spanish Government) under R&D Project TEC2016-75934-C4-1-R and R&D Technicians Grant PTA2015-10839-I. ; Ossorio-García, J.; Melgarejo-Lermas, JC.; Boria Esbert, VE.; Guglielmi, M.; Bandler, J. (2018). On the Alignment of Low-Fidelity and High-Fidelity Simulation Spaces for the Design of Microwave Waveguide Filters. IEEE Transactions on Microwave Theory and Techniques. 66(12):5183-5196. https://doi.org/10.1109/TMTT.2018.2871022 ; S ; 5183 ; 5196 ; 66 ; 12

[EN] The objective of this paper is to advance the state of the art in the characterization of the multipactor effect in dielectric materials. The materials studied are the most commonly used dielectrics in space applications, namely, Alumina, Rexolite, Rogers RT5870, Rohacell, Teflon, and Ultem 1000. In this paper, a new family of coaxial waveguide components, covering the L- and S-bands, with a wideband, low-pass response has been designed, and six different prototypes have been specifically optimized and manufactured. The six prototypes have then been used to simulate and measure the multipactor breakdown susceptibility charts for the six dielectric materials investigated. Finally, the simulation results are compared with the results of the measurement campaign indicating good agreement. ; This work was supported in part by the European Space Agency through Research Project "Novel Investigation in Multipactor Effect in Ferrite and Other Dielectrics Used in High Power RF Space Hardware" under Grant AO 1-7551/13/NL/GLC and in part by MINECO (Spanish Government) through Research and Development Project under Grant TEC2016-75934-C4-1-R. This paper is an expanded version from the IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes IMWS-AMP 2017, Pavia, Italy, September 20-22, 2017. ; Vague Cardona, JJ.; Melgarejo-Lermas, JC.; Guglielmi, M.; Boria Esbert, VE.; Anza Hormigo, S.; Vicente Quiles, CP.; Moreno Cambroreno, MDR. (2018). Multipactor Effect Characterization of Dielectric Materials for Space Applications. IEEE Transactions on Microwave Theory and Techniques. 66(8):3644-3655. https://doi.org/10.1109/TMTT.2018.2845869 ; S ; 3644 ; 3655 ; 66 ; 8

[EN] This paper reports on the experimental measurement of power threshold levels for the multipactor effect between samples of ferrite material typically used in the practical implementation of L-and S-band circulators and isolators. For this purposes, a new family of wideband, nonreciprocal rectangular waveguide structures loaded with ferrites has been designed with a full-wave electromagnetic simulation tool. The design also includes the required magnetostatic field biasing circuits. The multipactor breakdown power levels have also been predicted with an accurate electron tracking code using measured values for the secondary electron yield (SEY) coefficient. The measured results agree well with simulations, thereby fully validating the experimental campaign. ; This work was supported in part by the European Space Agency (ESA) through the Research Project Novel Investigation in Multipactor Effect in Ferrite and Other Dielectrics Used in High Power RF Space Hardware under Contract AO 1-7551/13/NL/GLC, in part by the Ministerio de Economia y Competitividad (Spanish Government) through Research and Development under Project TEC2016-75934-C4-1-R and Project TEC2016-75934-C4-2-R, and in part by the European Regional Development Fund under Project TEC2014-55463-C3-3-P. ; Vague Cardona, JJ.; Melgarejo-Lermas, JC.; Boria Esbert, VE.; Guglielmi, M.; Moreno Cambroreno, MDR.; Reglero Mangada, MS.; Mata-Sanz, R. (2019). Experimental Validation of Multipactor Effect for Ferrite Materials Used in L- and S-Band Nonreciprocal Microwave Components. IEEE Transactions on Microwave Theory and Techniques. 67(6):2151-2161. https://doi.org/10.1109/TMTT.2019.2915546 ; S ; 2151 ; 2161 ; 67 ; 6

This paper reports on the experimental measurement of power threshold levels for the multipactor effect between samples of ferrite material typically used in the practical implementation of L- and S-band circulators and isolators. For this purposes, a new family of wideband, nonreciprocal rectangular waveguide structures loaded with ferrites has been designed with a full-wave electromagnetic simulation tool. The design also includes the required magnetostatic field biasing circuits. The multipactor breakdown power levels have also been predicted with an accurate electron tracking code using measured values for the secondary electron yield (SEY) coefficient. The measured results agree well with simulations, thereby fully validating the experimental campaign. ; This work was supported by European Space Agency (ESA) through research project "Novel Investigation in Multipactor Effect in Ferrite and other Dielectrics used in High Power RF Space Hardware" (ref. AO 1-7551/13/NL/GLC), and by MINECO (Spanish Government) under R&D projects TEC2016-75934-C4-1-R, TEC2016-75934-C4-2-R and the ERDF co-funded project TEC2014-55463-C3-3-P.