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This article presents a dual‐band substrate integrated waveguide (SIW) band‐pass filter based on complementary split ring resonators (CSRRs) and multimode cavity resonator. The filter consists of a square SIW cavity, CSRRs and several perturbed metallic vias. The resonant frequencies of the CSRRs and TE102 mode form the first passband, and the resonant frequencies of the TE201 mode and TE202 mode...
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