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A novel tunable quad-band duplexer using short-ended stub-loaded stepped impedance resonator (SSSIR) is presented in this paper. The SSSIR is composed of a folded SIR and a short-ended stub with a varactor loaded at the center of SIR. As the bias voltage across the varactor increases, the equivalent length of the stub decreases, which leads to a tunable even-mode resonant frequency while a fixed odd-mode...
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