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A novel tri-band bandpass filter (BPF) using a stepped-impedance square ring loaded resonator (SISRLR) is presented. The proposed resonator consists of a square ring with two open stubs and two short stubs. By tuning the impedance ratios of the SISRLR, the passbands can be adjusted and three pairs of transmission poles are produced for tri-band design. On the basis of the resonator, a miniaturised...
Two compact dual-band bandpass filters based on open complementary split-ring resonators (OCSRRs) with stub loaded are presented. Both of the stub-loaded open-loop resonators can achieve two resonant modes, and each of the resonators generate a passband. Thus, a small ratio of two passbands central frequencies can be obtained. Moreover, the two resonant modes of the outer ring are λ/4 resonators,...
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