Ejemplo práctico de diseño de un filtro en iris rectangular empleando tecnología SIW para laboratorios docentes

Comunicación presentada en el XXIX Simposium Nacional de la Unión Científica Internacional de Radio, URSI 2014, Valencia, Septiembre 2014.This paper presents the design and practical implementation of a waveguide-based microwave filter in Substrate Integrated Waveguide (SIW) technology. The use of SIW technology for implementing waveguide filters makes the presented design specially aimed for being used in undergraduate courses related to microwave engineering and filter designing. Their low cost and easiness from the filter fabrication point of view allows their use in microwave laboratory courses where students can implement their own theoretical filter designs and measure their frequency response

Design of compensated multiport waveguide junctions considering mechanization effects

tA new tool for the rigorous and efficient design of compensated multiport waveguide junctions, consider-ing the mechanization effects due to low-cost manufacture techniques, is presented. Several new designsfor a great variety of key components, present in modern microwave and millimetre-wave equipment, areproposed taking into account the introduction of rounded corners in the rectangular waveguide accessports. The new implemented tool permits to control and compensate for the potential degradation of thewide-band performance of such components prior to their fabrication, thus achieving an optimal design.All the presented results have been successfully validated by comparing the obtained simulated datawith the results provided by a commercial software based on the finite-element method.San Blas Oltra, ÁA.; Boria Esbert, VE.; Gimeno Martinez, B.; Cogollos Borras, S. (2015). Design of compensated multiport waveguide junctions considering mechanization effects. AEU - International Journal of Electronics and Communications. 69(1):328-331. doi:10.1016/j.aeue.2014.10.003S32833169

Low-cost Implementation of a Waveguide-based Microwave Filter in Substrate Integrated Waveguide (SIW) Technology

This paper presents the design and practical implementation of a waveguide-based microwave filter in Substrate Integrated Waveguide (SIW) technology. The use of SIW technology for implementing waveguide filters makes the presented design specially aimed for being used in undergraduate courses related to microwave engineering and filter designing. Their low cost and easiness from the filter fabrication point of view allows their use in microwave laboratory courses where students can implement their own theoretical filter designs and measure their frequency response. The requiring mechanics in the manufacturing of microwave filters in waveguide technology (both rectangular and circular) makes its use practically unfeasible in academic laboratories because of its cost. For this reason, a practical design example of a waveguide iris filter using the impedance inverter model is proposed in this paper for academic laboratories, using SIW technology. This is a low cost and easy to manufacture technology. The overall process includes the design of the ideal band-pass prototype filter using the impedance inverter and its implementation in an inductive iris-coupled waveguide filter, by using a developed electromagnetic simulator based on the mode-matching technique. Finally, the equivalent filter in SIW technology is obtained and optimized by using HFSS simulator, including a SIW to microstrip transition. A prototype of the designed filter has been fabricated and measured, showing a good agreement between measurements and simulations.Ministerio de Economía y Competitividad, TEC2013-47037-C5-4-R

A novel band-pass filter based on a periodically drilled SIW structure

The design and fabrication of a band-pass step impedance filter based on high and low dielectric constant sections has been realized on substrate integrated waveguide (SIW) technology. The overall process includes the design of the ideal band-pass prototype filter, where the implementation of the impedance inverters has been carried out by means of waveguide sections of lower permittivity. This can be practically achieved by implementing arrays of air holes along the waveguide. Several SIW structures with and without arrays of air holes have been simulated and fabricated in order to experimentally evaluate their relative permittivity. Additionally, the equivalent filter in SIW technology has been designed and optimized. Finally, a prototype of the designed filter has been fabricated and measured, showing a good agreement between measurements and simulations, which demonstrates the validity of the proposed design approach.This work was supported by the Ministerio de Economía y Competitividad, Spanish Government, under the Research Project TEC2013-47037-C5-4-R

Full-wave analysis and design of broadband turnstile junctions

The efficient design of broadband turnstile junctions compensated with piled-up cylindrical metallic posts is discussed in this contribution. Very high relative bandwidths can be obtained, while maintaining the diameter of the input circular access port lower than the width of the rectangular waveguide ports, thus reducing the number of excited higher order circular waveguide modes. A novel full-wave analysis tool has also been implemented in order to reduce the CPU effort related to the complete design process.San Blas Oltra, ÁA.; Pérez Soler, FJ.; Gil Raga, J.; Mira Pérez, FE.; Boria Esbert, VE.; Gimeno Martinez, B. (2011). Full-wave analysis and design of broadband turnstile junctions. Progress In Electromagnetics Research Letters. 24:149-158. doi:10.2528/PIERL11051703S1491582

Broad band analysis of arbitrarily shaped microwave filters using a novel singular value decomposition technique

A new full-wave electromagnetic analysis method based on the Boundary Integral Resonant Mode Expansion (BI-RME) is presented in this paper. The technique allows the computation of the broad band circuital response of arbitrarily shaped cavity filters. The coaxial excitation of this kind of filters is rigorously modeled by taking into account the high order modes on the coaxial aperture. A singular decomposition algebraic procedure has been implemented in order to obtain the solenoidal and non-solenoidal counterparts contributions of the electric current density inside the cavity needed by the BI-RME formulation. This method is simple and avoids some issues associated to star and loop based functions which are typically used for the same purpose.This work has been developed with financial support fromSENECA project Ref. 08833/PI/08, and CICYT project Ref.TEC2007-67630-C03

Highly efficient full-wave electromagnetic analysis of 3D arbitrarily-shaped waveguide microwave devices using an integral equation technique

A novel technique for the full-wave analysis of 3-D complex waveguide devices is presented. This new formulation, based on the Boundary Integral-Resonant Mode Expansion (BI-RME) method, allows the rigorous full-wave electromagnetic characterization of 3-D arbitrarily shaped metallic structures making use of extremely low CPU resources (both time and memory). The unknown electric current density on the surface of the metallic elements is represented by means of Rao-Wilton-Glisson basis functions, and an algebraic procedure based on a singular value decomposition is applied to transform such functions into the classical solenoidal and nonsolenoidal basis functions needed by the original BI-RME technique. The developed tool also provides an accurate computation of the electromagnetic fields at an arbitrary observation point of the considered device, so it can be used for predicting high-power breakdown phenomena. In order to validate the accuracy and efficiency of this novel approach, several new designs of band-pass waveguides filters are presented. The obtained results (S-parameters and electromagnetic fields) are successfully compared both to experimental data and to numerical simulations provided by a commercial software based on the finite element technique. The results obtained show that the new technique is specially suitable for the efficient full-wave analysis of complex waveguide devices considering an integrated coaxial excitation, where the coaxial probes may be in contact with the metallic insets of the component.This work was supported by the Ministerio de Economia y Competitividad, Spanish Government, under the Research Projects TEC2013-47037-C5-1-R and TEC2013-47037-C5-4-R.Vidal Pantaleoni, A.; San Blas Oltra, ÁA.; Quesada Pereira, FD.; Pérez Soler, FJ.; Gil Raga, J.; Vicente Quiles, CP.; Gimeno Martinez, B.... (2015). Highly efficient full-wave electromagnetic analysis of 3D arbitrarily-shaped waveguide microwave devices using an integral equation technique. Radio Science. 50(7):642-655. https://doi.org/10.1002/2015RS005685S64265550

Análisis y diseño de dispositivos pasivos de microondas y milimétricas en guía de ondas con excitación coaxial

Las guías coaxiales se emplean frecuentemente en la alimentación e interconexión de un elevado número de dispositivos de microondas y ondas milimétricas utilizados en numerosas aplicaciones prácticas (filtros, diplexores, multiplexores, etc.). Por ello, la caracterización rigurosa y eficiente de la excitación coaxial de dispositivos implementados en tecnología guiada es un tema de investigación muy importante que ha sido tratado ampliamente en la literatura técnica. Sin embargo, el número de contribuciones que se dedican a investigar este tema desde un punto de vista multimodal es realmente reducido. El objetivo fundamental de este trabajo consiste en la caracterización multimodal eficiente de la excitación coaxial de dispositivos implementados en guía rectangular utilizando el método BI-RME (Boundary Integral - Resonant Mode Expansion) 3D. En concreto, en este trabajo se caracterizan dos tipos de configuraciones ampliamente utilizadas en la práctica: la excitación coaxial clásica, y la excitación coaxial en configuración colineal. Este último tipo de excitación se emplea comúnmente en los denominados filtros en configuración comb-line, los cuales también son objeto de investigación en el presente trabajo. En particular, se ha desarrollado una herramienta de análisis y diseño muy eficiente desde un punto de vista computacional que permite caracterizar de forma precisa este tipo de filtros. Otro de los objetivos del presente trabajo es el análisis y el diseño de uniones en guía rectangular compensadas con postes conductores de geometría cilíndrica utilizando la técnica BI-RME 3D. Las uniones diseñadas (codos rectos, uniones en T, uniones T mágica y uniones turnstile) presentan una respuesta eléctrica óptima y, además, el trabajo desarrollado demuestra que la posición relativa del poste en la estructura es un parámetro de diseño muy importante que no se había considerado previamente en la literatura técnica dedicada a este tema.San Blas Oltra, ÁA. (2008). Análisis y diseño de dispositivos pasivos de microondas y milimétricas en guía de ondas con excitación coaxial [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/8308Palanci

Análisis multimodal eficiente de uniones planares entre guías arbitrarias: aplicación a la excitación coaxial de dispositivos

In this paper, a novel technique for the rigorous multimodal analysis of arbitrary planar waveguide junctions is presented. The proposed method, based on the resolution of a magnetic-type integral equation, turns out to be very efficient from the computational point of view, thus facilitating its integration in modern CAD tools oriented to the design and optimization of guided passive microwave devices. Different types of coaxial fed planar waveguide junctions have been analyzed thus fully validating the proposed technique