Segmentation strategy for the efficient analysis and design of substrate integrated waveguide directly coupled cavity filters

Abstract

Institution of Engineering and Technology (IET)Martínez-Zamora, JÁ.; Belenguer, Á.; Esteban González, H.; Boria Esbert, VE. (2016 AbstractIn this paper a new segmentation strategy is presented for the full-wave analysis of directly coupled cavity filters in substrate integrated waveguide 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 not 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 GSM of these building blocks are obtained with highly efficient techniques specifically suited for the analysis of H-plane rectangular waveguided devices. Some building blocks are repeated along the structure, and their scattering matrix has to be computed only once, thus improving the numerical efficiency. The scattering matrices of all the building blocks are cascaded using an appropriate method, and the scattering matrix of the whole SIW filter is finally obtained.In order to test the efficiency of this new method, a SIW filter of 8 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.

Fast Frequency Sweep Technique Based on Segmentation for the Acceleration of the Electromagnetic Analysis of Microwave Devices

“…Segmenting the structure into simple blocks is a common strategy used by many authors to speed up the analysis of complex microwave devices [13][14][15][16]. Each building block (i.e., inverters, resonant posts, empty transmission lines, etc.)…”