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

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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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Published

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.

Inspec keywords: equivalent circuits; waveguide filters; microswitches; UHF filters

Other keywords: frequency shift; radio frequency microelectromechanical systems switches; two-pole digitally tunable evanescent-mode waveguide narrow-band filter; gain 1 dB; resonant states; unloaded quality factor; bandwidth; frequency tuning range; insertion loss; equivalent circuit model

Subjects: MEMS and NEMS device technology; Filters and other networks; Relays and switches; Waveguide and microwave transmission line components

References

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      • Park, S.-J., Reines, I., Rebeiz, G.: `High-Q RF-MEMS tunable evanescent-mode cavity filter', 2009 IEEE MTT-S Int. Microwave Symp. Digest, 2009, p. 1145–1148.
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      • Amadjikpè, A., Papapolymerou, J.: `A high-Q electronically tunable evanescent-mode double-ridged rectangular waveguide resonator', 2008 IEEE MTT-S Int. Microwave Symp. Digest, 2008, p. 1019–1022.
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      • Hajela, S., Xun, G., Chappell, W.J.: `Widely tunable high-Q evanescent-mode resonators using flexible polymer substrates', 2005 IEEE MTT-S Int. Microwave Symp. Digest, 2005, p. 2139–2142.
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      • Xiaoguang, L., Katehi, L.P.B., Chappell, W.J., Peroulis, D.: `A 3.4–6.2 GHz continuously tunable electrostatic MEMS resonator with quality factor of 460–530', 2009 IEEE MTT-S Int. Microwave Symp. Digest, 2009, p. 1149–1152.
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