A novel design of a dual-mode resonator with double-ring structure for a band-pass filter is presented in this paper. Voltage/current couplings between the two rings are proposed based on a mode chart. Because each ring exhibits dual-mode responses, they determine the range of operation; that is, the inner/outer rings depict the upper/lower frequencies of the pass band, respectively. This is an alternative approach to improve the bandwidth of the conventional dual-mode ring resonator. Experimental results are presented and discussed.
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