Compact Quasi-Elliptic-Type Inline Waveguide Bandpass Filters With Nonlinear Frequency-Variant Coupling Inverters

• DOI: 10.36227/techrxiv.19204854.v1
• Publication Date: 2022-02-23T03:58:34Z
• Authors: Roberto Gómez-García; Adam Lamecki; Michal Mrozowski; Muhammad Yameen S...
• Keywords: Stopband; Passband; Waveguide filter; Waveguide

This work presents the design techniques to synthesize a class of compact inline quasi-elliptic-type waveguide cavity bandpass filters based on novel nonlinear frequency-variant coupling (NFVC) inverters. These highly dispersive frequency variant couplings are realized by means pair partial height posts that placed at junctions between each two resonators. Each NFVC produces transmission pole in independently adjustable zeros (TZs). Whereas is added overall filtering function augment its order, TZs can be side filter passband attain sharp rejection capability and increase stopband attenuation levels. To these filters, coupling-routing-diagram (CRD) approaches for presented either consider (i) an arbitrary (AFVC) or (ii) resonating nodes interacting with zero-susceptance non-resonating node through constant An equivalent lumped-element circuit model associated both CRD provided. It demonstrated models exploited theoretical synthesis this type whereas provide deeper insight systematic dimensioning posts. For experimental validation purposes, three examples synthesized, 10-GHz proof-of concept prototypes them EM-simulated, fabricated, characterized. The measured results agree well simulations theory, thus verifying using NFVCs. <br>