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Two-pole digitally tunable evanescent-mode waveguide narrow-band filter with radio frequency micro-electromechanical systems switches

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6 Author(s)
A. L. Amadjikpe ; Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA ; D. J. Chung ; S. Courreges ; P. Eudeline
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A two-pole evanescent-mode waveguide narrow-band filter digitally tunable with micro-electromechanical system (MEMS) switches is demonstrated. A design approach for a prescribed frequency shift and tuning range is elaborated using a simple equivalent circuit model. The validity of the proposed frequency tuning concept is proved through simulation and measurement of a prototype. The measured tunable filter achieves three resonant states around 3 GHz, with an average frequency tuning of 20 MHz between each state, a fractional 1-dB bandwidth of 1.2-1.5% and better than 2.1 dB insertion loss. The measured unloaded quality factor (Q) of the filter varies from 315 to 460 over the frequency tuning range.

Published in:

IET Microwaves, Antennas & Propagation  (Volume:5 ,  Issue: 4 )