Jonathan H. Dang, R. C. Gough, Andy M. Morishita, A. Ohta, W. Shiroma
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A tunable x-band substrate integrated waveguide cavity filter using reconfigurable liquid-metal perturbing posts
A tunable bandpass filter based on reconfigurable liquid-metal perturbing posts in a substrate integrated waveguide (SIW) cavity is demonstrated. The design consists of four reconfigurable posts in a single cavity which provide five center frequencies from 10.13 GHz to 11.31 GHz. To enable frequency tuning, nontoxic liquid-metal Galinstan is hydraulically actuated to activate and deactivate posts. The five states have an average peak insertion loss of 1.35 dB with fractional bandwidths of 0.6% to 1% and unloaded quality factors of 96 to 154.
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