Low Loss Tunable Filters in Substrate Integrated Waveguide

[EN] In this work, the design and experimental results of compact low-loss filters, based on the extension of the classical coaxial waveguide resonator to Substrate Integrated Waveguide technology, are successfully demonstrated. The design, fabrication and measurement of a continuously tunable cavity resonator and a two-pole filter at S-band in single-layer SIW technology are presented. These structures keep the low-cost fabrication scheme of single-layer PCB processing, while requiring less than half the area compared to a conventional SIW design.The authors would like to thank Generalitat Valenciana and MICINN (Spanish Government) for its financial support under projects GV/2009/007 and TEC2010-21520-C04-01.Sirci, S.; Martínez Pérez, JD.; Taroncher Calduch, M.; Boria Esbert, VE. (2012). Low Loss Tunable Filters in Substrate Integrated Waveguide. Waves. 1(4):69-78. http://hdl.handle.net/10251/57922S69781

Compact CPW-fed combline filter in substrate integrated waveguide technology

“© © 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising 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.”In this letter, the design and experimental results of compact low loss combline filters, based on the extension of the classical coaxial waveguide resonator to Substrate Integrated Waveguide (SIW) technology, are succesfully demonstrated. A three-pole 5% FBW Chebyshev filter has been designed, fabricated and measured. The fabricated device shows an excellent agreement with simulated results. These structures keep the low-cost fabrication scheme of single-layer PCB processing, while requiring less than half the area compared to a conventional SIW design.Manuscript received September 07, 2011; accepted October 20, 2011. Date of publication December 16, 2011; date of current version January 11, 2012. This work was supported by Generalitat Valenciana and MICINN (Spanish Government) under projects GV/2009/007 and TEC2010-21520-C04-01.Martínez Pérez, JD.; Sirci, S.; Taroncher Calduch, M.; Boria Esbert, VE. (2012). Compact CPW-fed combline filter in substrate integrated waveguide technology. IEEE Microwave and Wireless Components Letters. 22(1):7-9. https://doi.org/10.1109/LMWC.2011.2174215S7922

Accurate consideration of metal losses at waveguide junctions using admittance and impedance integral equation formulations

[EN] At higher frequencies, metal loss effects in passive waveguide components become more pronounced and hazardous. In this paper, we propose two integral equation techniques, based on the generalized admittance and impedance matrices, for the accurate consideration of losses in the metal walls of waveguide junctions. Both techniques have been evaluated in terms of accuracy and numerical efficiency, and conclusions are drawn regarding the best properties of the admittance parameter formulation. Finally, combining such technique with a classical perturbative method for considering propagation losses, we have successfully predicted all loss effects in two real waveguide filters used for commercial applications.This work has been supported by research projects TIC2000-0591-C03-01 and TIC2000-0591-C03-03 and special action ESP2001-4547-PE.Taroncher Calduch, M.; Hueso, J.; Cogollos, S.; Gimeno. B.; Boria Esbert, VE.; Vidal Pantaleoni, A.; Esteban González, H.... (2005). Accurate consideration of metal losses at waveguide junctions using admittance and impedance integral equation formulations. Radio Science. 40(6):1-12. doi:10.1029/2004RS003225S11240

Optimized Multipactor-Resistant Wedge-Shaped Waveguide Bandpass Filters

[EN] Wedge-shaped waveguides present a certain advantage with respect to rectangular waveguides regarding their resistance to multipactor discharges. In this paper, the optimal configuration for the wedge geometry is investigated based on theoretical results, on a precise multipactor prediction tool, and on previous experience. In addition, design rules are presented, which allow us to achieve for wedge-shaped filters electrical performances comparable to the ones of rectangular waveguide filters, while at the same time improving the multipactor-free power range. As a proof of concept, two three-pole bandpass filters with equivalent electrical characteristic of 150-MHz bandwidth, centered at 12 GHz (Ku band), and the same Q factor have been designed, manufactured, and tested. The first design is based on conventional rectangular waveguide technology, while the second one has non-parallel broadside walls (wedge-shaped cross section). The multipactor power threshold and RF performance of the filters have been measured in order to validate the improvements achievable employing wedge-shaped resonators.This work was supported by the Ministerio de Ciencia e Innovacion, Spain, under Research Project TEC2010-21520-C04-01/TCM.Hueso González, J.; Raboso García-Baquero, D.; Ernst, C.; Schmitt, D.; Boria Esbert, VE.; Gimeno Martinez, B.; Taroncher Calduch, M.... (2013). Optimized Multipactor-Resistant Wedge-Shaped Waveguide Bandpass Filters. IEEE TRANSACTIONS ON PLASMA SCIENCE. 41(8):2135-2144. https://doi.org/10.1109/TPS.2013.2253134S2135214441

Multipactor Effect Characterization of Dielectric Materials for Space Applications

[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.2018.2845869S3644365566

Helical resonator filters with improved multipactor performance exploiting rigorous modelling and the large gap approach

[EN] The power handling capability of helical resonator filters is studied by means of the parallel plate model (employed in the European Cooperation for Space Standardisation) and more rigorous modelling techniques (like the one available in the commercial software tool SPARK3D (TM)) as well as through an experimental test campaign. The results indicate that the parallel plate model provides conservative power handling capabilities for this class of filters, while rigorous modelling can better capture the impact of the geometrical features on multipactor evolution. Although the accuracy of the estimated power handling depends on the knowledge of the practical secondary emission yield values, the use of such rigorous modelling tools enables the design of helical resonator filters with improved power handling capability by exploiting the large gap approach, therefore opening opportunities to avoid additional dielectric fillings.Salza, G.; Goussetis, G.; Vicente, C.; Kosmopoulos, S.; Reglero Mangada, MS.; Taroncher Calduch, M.; Boria Esbert, VE.... (2019). Helical resonator filters with improved multipactor performance exploiting rigorous modelling and the large gap approach. IET Microwaves Antennas & Propagation. 13(10):1756-1759. https://doi.org/10.1049/iet-map.2019.0245S175617591310Doumanis, E., Goussetis, G., Steffe, W., Maiarelli, D., & Kosmopoulos, S. A. (2010). Helical Resonator Filters With Improved Power Handling Capabilities for Space Applications. IEEE Microwave and Wireless Components Letters, 20(11), 598-600. doi:10.1109/lmwc.2010.2066962Salza G. Goussetis G. Doumanis E. et al.:‘Helical resonator with modulated radius for improvedmultipactor threshold: numerical and experimental results’.46 European Microwave Week London UK October2016Yu M. Dokas V.:‘High performance helical resonator filters’.Proc. European Microwave Conf. Amsterdam The Netherlands October2004 pp.989–992Clark K. Thamviriyakul C.:‘A possible explanation for the brief life‐span ofUoSAT‐4’.11th Amsat‐UK Conf. Guildford UK June1996Doumanis, E., Goussetis, G., & Kosmopoulos, S. A. (2011). Inline Interdigital Pseudo-Elliptic Helical Resonator Filters. IEEE Microwave and Wireless Components Letters, 21(8), 400-402. doi:10.1109/lmwc.2011.2160162ECSS multipactor tool. Available athttp://www.val‐space.com/highpowerlabrf/multipactor‐tool/ accessed 16 March 2016SPARK3D. Available atwww.fest3d.com/spark3d.php accessed 16 March 2016Vaughan, J. R. M. (1988). Multipactor. IEEE Transactions on Electron Devices, 35(7), 1172-1180. doi:10.1109/16.3387ESA‐ESTEC TRP AO/1‐4978/05/NL/GLC ‘SEY Database’ Final Report December 2011. Results are also reproduced inhttp://www.fest3d.com/Online_Help/SPARK3D/Multipactor%20practical%20considerations.html accessed 16 March 2016Hong, J.-S., & Lancaster, M. J. (2001). Microstrip Filters for RF/Microwave Applications. doi:10.1002/0471221619ESA/VSC RF Space High Power Laboratory Valencia Spain. Available atwww.val‐space.com accessed 16 March 2016Baglin V. Bojko1 J. Gröbner O. et al.: ‘The secondary electron yield of technical materials and its variation with surface treatments’.Proc. of European Particle Accelerator Conf. 2000 Vienna Austria September2000 pp.1–