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Coupled-Resonator Waveguide Filter in Quadruplet Topology With Frequency-Dependent Coupling – A Design Based on Coupling Matrix

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3 Author(s)
Lukasz Szydlowski ; Department of Electronics, Telecommunication and Informatics, WiComm Center of Excellence, The Gdańsk University of Technology, Gdańsk, Poland ; Adam Lamecki ; Michal Mrozowski

This letter presents an application of a recently developed coupling matrix synthesis technique to design of coupled-resonator filters with dispersive inter-resonator couplings. This technique is used to design a novel coupled-cavity bandpass filter. Measurements validate the design and confirm effectiveness of the synthesis method. The filter is a four-pole generalized Chebyshev filter with three transmission zeros. Resonators are arranged in a quadruplet configuration and employ a single dispersive cross coupling to produce an extra zero in comparison to classical approaches. Frequency-dependent coupling was realized via a rectangular waveguide iris with an incomplete height conducting post.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:22 ,  Issue: 11 )