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[EN] The characterization of communication devices in a certain frequency band can be accelerated if a fast frequency sweep technique is used instead of a discrete frequency sweep. Existing fast frequency sweep techniques are either complex or specific for a certain electromagnetic solver. In this work, a new fast frequency sweep method is proposed that consists in segmenting the device under analysis into simple building blocks. Each building block is characterized with a generalized (multimode) circuital matrix whose elements present a simple and flat frequency response that is interpolated using natural cubic splines with very few points. In this way, the response of each block along the whole frequency band is obtained efficiently and accurately with as many frequency points as desired. Then, the circuital matrices of all the blocks are cascaded and the circuital matrix of the whole device in obtained. The new fast frequency sweep was successfully applied to the analysis of different types of devices (all metallic rectangular waveguide filter, dielectric loaded rectangular waveguide filter, and substrate integrated waveguide filter). The computational times were reduced to 15% or 19%, depending on the device, when compared with a discrete frequency sweep using the same electromagnetic solver. ; This research was funded by Ministerio de Economia, Industria y Competitividad, Spanish Government, under Research Projects TEC2016-75934-C4-3-R and TEC2016-75934-C4-1-R. ; Martínez-Zamora, JÁ.; Belenguer Martínez, A.; Esteban González, H. (2019). Fast Frequency Sweep Technique Based on Segmentation for the Acceleration of the Electromagnetic Analysis of Microwave Devices. Applied Sciences. 9(6):1-16. https://doi.org/10.3390/app9061118 ; S ; 1 ; 16 ; 9 ; 6 ; Erdemli, Y. E., Reddy, C. J., & Volakis, J. L. (1999). Awe Technique in Frequency Domain Electromagnetics. Journal of Electromagnetic Waves and Applications, 13(3), 359-378. doi:10.1163/156939399x00961 ; Reddy, C. J., Deshpande, M. D., Cockrell, C. R., & ...

This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves Antennas and Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library ; In this study, a new segmentation strategy is presented for the full-wave analysis of directly coupled cavity filters in substrate integrated waveguide (SIW) technology. The whole SIW filter is enclosed inside an external fictitious rectangular waveguide, which does not affect the propagation inside the SIW assuming that the SIW is well designed and there is no significant power leakage. The external rectangular waveguide allows to easily segment the structure into building blocks that are composed of circular metallic vias inside a rectangular waveguide. The generalised scattering matrix of these building blocks is obtained with highly efficient techniques specifically suited for the analysis of H-plane rectangular waveguide devices. Some building blocks are repeated along the structure, and their scattering matrix has to be computed only once. The scattering matrices of all the building blocks are cascaded and the scattering matrix of the whole filter is obtained. A SIW filter of eight coupled cavities with a bandpass response centred at 11 GHz is analysed. Results from this analysis show that the computational time has been significantly reduced when compared with other specific SIW analysis methods or with commercial general purpose software, while maintaining a good accuracy. ; This work was funded by the Ministerio de Economia y Competitividad of the Spanish Government under the project number TEC2013-47037-C5-1-R. ; Martínez-Zamora, JÁ.; Belenguer, Á.; Esteban González, H.; Boria Esbert, VE. (2016). Segmentation strategy for the efficient analysis and design of substrate integrated waveguide directly coupled cavity filters. IET Microwaves Antennas and Propagation. 10(3):283-287. https://doi.org/10.1049/iet-map.2015.0284 ; S ; 283 ; 287 ; 10 ; 3

(c) 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works. ; [EN] Recently, Empty Substrate Integrated Waveguide (ESIW) technology was proposed for embedding empty waveguides into planar substrates in order to improve their performance. A low-loss and narrow-band transition from microstrip to an increased height ESIW with 4 layers was presented in a previous work, and used to implement a very high-quality factor bandpass filter at Q-band. With such a narrow-band transition, based on a quarter-wavelength transformer, a very narrow-band filter response with resonators having a quality factor of 1000 was achieved. In this paper, in order to overcome the narrow-band and the 4-layers output restrictions, and extend the practical use of such increased height ESIWs beyond narrow-band filters, we present a novel wideband transition from microstrip to an increased height ESIW with an arbitrary number of layers. A full suite of wideband transitions to increased height ESIWs, built with different number of substrate layers ranging from 3 to 8, has been designed in this work to operate at Ka-band, though they can be easily transferred to other bands if the dimensions of the transition are properly scaled. To illustrate this, the original Ka-band transitions have been mapped to Ku-band, with excellent results. In order to test the proposed design method, a prototype of a 4-layer structure has been fabricated at Ka-band, achieving a good performance in the whole useful bandwidth of the ESIW. ; This work was supported in part by the Ministerio de Economia y Competitividad, Spanish Government, under Project TEC2016-75934-C4-3-R and Project TEC2016-75934-C4-1-R, and in part by the Consejeria de Educacion, Cultura y Deportes, Autonomous ...

© 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] Recently, new methodologies for manufacturing empty waveguides completely integrated in a planar substrate have been proposed in order to improve the performance of substrate-integrated devices. One of these alternatives is the so-called empty substrate-integrated waveguide (ESIW). The height of high-frequency substrates, where ESIW devices are integrated, is very small. Then, the capacity of storing energy of ESIW resonators is drastically reduced, and as a result, their quality factor is not as high as it could be with a higher ESIW. In order to overcome this restriction, a novel integrated structure is proposed to embed very high-quality factor filters based on the ESIW with an increased height. As a result, we show, in this letter, for the first time, the successful integration of an increased-height ESIW filter in a printed circuit board of 0.305 mm height at Q-band, achieving a quality factor above 1000, which is a remarkable result for a completely substrate-integrated device operating in this frequency band. When compared with the same filter manufactured with an ESIW with the same height as the substrate, the novel filter shows a measured quality factor 85% higher. ; This work was supported by the Ministerio de Economia y Competitividad, Spanish Government, under Project TEC2016-75934-C4-3-R and Project TEC2016-75934-C4-1-R. ; Martínez-Zamora, JÁ.; De Dios, JJ.; Belenguer Martínez, Á.; Esteban González, H.; Boria Esbert, VE. (2018). Integration of a Very High Quality Factor Filter in Empty Substrate Integrated Waveguide at Q-band. IEEE Microwave and Wireless Components Letters. 28(6):503-505. ...

[EN] Substrate integrated waveguides are increasingly being used due to their capability of combining the advantages of planar circuits and traditional waveguides. The development of empty substrate integrated waveguides has substantially reduced the related insertion losses, since waves propagate through air instead of propagating through a lossy dielectric medium. Recently, a new empty coaxial structure, completely built with printed circuit boards and integrated in a substrate, has been proposed. It has been named empty substrate integrated coaxial Line (ESICL). The resulting coaxial line has low cost, easy manufacturing, low radiation, low losses, high-quality factor, and is non dispersive. A transition from grounded coplanar waveguide to ESICL already exists. In this work, a transition from microstrip to ESICL is presented for the first time. In order to demonstrate its feasibility, a back-to-back structure and a bandpass filter have been manufactured and measured. ; This work was supported by the Ministerio de Economia y Competitividad, Spanish Government, under Research Project TEC2016-75934-C4-3-R and Research Project TEC2016-75934-C4-1-R. ; Quiles, F.; Belenguer Martínez, Á.; Martínez-Zamora, JÁ.; Nova-Giménez, V.; Esteban González, H.; Boria Esbert, VE. (2018). Compact Microstrip to Empty Substrate Integrated Coaxial Line Transition. IEEE Microwave and Wireless Components Letters. 28(12):1080-1082. https://doi.org/10.1109/LMWC.2018.2874280 ; S ; 1080 ; 1082 ; 28 ; 12