Practical Design of Filters Using EBG Waveguides Periodically Loaded with Metal Ridges

[EN] The dispersion diagram of infinite periodic structures is useful for the practical design of waveguide filters. Starting from the dispersion diagram of a unit cell, it is possible to generate a finite structure with very similar pass- and stop-bands (gaps). However, truncation of the infinite periodic structure degrades the pass-band performance. In this paper, these impairments are overcome by means of suitable waveguide tapers matching the impedance of the periodic structure to the access ports. As a result, the design of practical low-pass filters, derived from passive structures based on Electromagnetic Band-Gap (EBG) waveguides periodically loaded with metal ridges, is successfully addressed. According to this procedure, a five-order and an eight-order EBG low-pass filters are obtained after an optimization step. Measurements of a manufactured prototype fully validate the proposed approach.This work was supported by the Ministerio de Economía y Competitividad (MINECO), Spanish Government, under the R&D projects TEC2013-47037-C5-1-R and TEC2013-47037-C5-4-R. The authors would like to thank ITACA (Instituto de Aplicaciones de las Tecnologías y de las Comunicaciones Avanzadas), from Technical University of Valencia (Valencia, Spain), for their support in the accurate manufacturing of the low-pass filter prototypeMarini, S.; Soto Pacheco, P.; Coves, A.; Gimeno Martinez, B.; Boria Esbert, VE. (2016). Practical Design of Filters Using EBG Waveguides Periodically Loaded with Metal Ridges. Progress in ElectromagneticsResearch C. Pier C. 63:13-21. https://doi.org/10.2528/PIERC1511160313216