Compact Dual-Band and Wideband Filters With Resonant Apertures in Rectangular Waveguide

[EN] The objective of this article is to describe a new family of microwave bandpass filters in the rectangular waveguide based on resonant apertures, which can be used to implement both single- and dual-band transfer functions. The use of capacitive stubs and a staircase configuration is also discussed in order to enhance the out-of-band response and the selectivity of the filter with respect to the state of the art. Finally, simulations are compared with measured results, showing very good agreement, thereby fully validating both the new filter topologies and the design procedure.This work was supported in part by the Ministerio de Ciencia e Innovacion, Spanish Government, through the Research and Development Project PID2019-103982RB, under Grant MCIN/AEI/10.13039/501100011033; and in part by the Generalitat Valenciana under Santiago Grisolia Grant GRISOLIA/2017/073. This article is an expanded version from the IEEE MTT-S International Microwave Symposium (IMS 2021), Atlanta, GA, USA, June 20-25, 2021 [DOI: 10.1109/IMS19712.2021.9574801].Valencia Sullca, JF.; Cogollos, S.; Boria Esbert, VE.; Guglielmi, M. (2022). Compact Dual-Band and Wideband Filters With Resonant Apertures in Rectangular Waveguide. IEEE Transactions on Microwave Theory and Techniques. 70(6):3125-3140. https://doi.org/10.1109/TMTT.2022.31623073125314070