Compact dual‐mode dual‐band HMSIW bandpass filters using source–load coupling with multiple transmission zeros

Abstract

Compact dual-mode dual-band bandpass filters (BPFs) with multiple transmission zeros (TZs) using over-mode half-mode substrate integrated waveguide (HMSIW) resonators are presented. Each passband built by TE001 or TE201 has three TZs introduced by source–load coupling and low-/high-order mode cross-coupling between TE001 and TE201 to improve the frequency-selectivity. The equations that determined the TZs are built. Perturbation slots realise the independent-control of frequency ratio. Dual-mode dual-band BPFs are designed, fabricated and measured, and the simulated results agree with the measured results well.