研究期間：10108~10207;Bandpass filters and multiplexers are important front-end components. They provide a small loss in the passband and a large attenuation in the stopband. Demands of multifunction and multifrequency keep changeling researchers and engineers with more and more stringent specifications. Recently, more and more research focus on reconfigurable bandpass filter and multiplexer designs. To this end, this project proposes several novel reconfigurable bandpass filters and multiplexers. They are switchable dual-band bandpass filter, switchable quad-band bandpass filter, switchable multiplexer and diplexer based on multi-mode resonator. These circuits will be fabricated using microstrip technology and PIN diodes. Initial simulation results have shown the possibility of the proposed circuits.