DUAL-BAND FILTERS USING COMPLEMENTARY SPLIT-RING RESONATOR AND CAPACITIVE LOADED HALF-MODE SUBSTRATE-INTEGRATED-WAVEGUIDE
David Senior, Xiaoyu Cheng and Yong-Kyu Yoon
Novel dual-band bandpass filters are implemented for 3.5GHz and 5.8GHz operation by using the half-mode substrate integrated-waveguide (HMSIW) loaded with a complementary split-ring resonator (CSRR) and a capacitive metal patch. Forward electromagnetic wave transmission below the characteristic waveguide cutoff frequency is achieved at two arbitrary frequency bands. Relatively independent control of the resonance frequencies, external Q factor and mutual coupling are possible. A dual band resonator and a two-pole miniaturized bandpass filter are demonstrated. The external and internal mutual coupling variations are fully investigated. Full wave structure simulation and measurement results are provided.
Keywords: Band pass filters, Dual band, Microwave filters, Q factor, Resonant frequency, Resonator filters and Substrates