Wideband Half Mode Substrate Integrated Waveguide (HMSIW) Bandpass Filter

A higher-order wideband multimode filter is proposed in this paper. The proposed filter is designed using a half-mode substrate integrated waveguide (HMSIW) technology. A wideband frequency response is achieved by exciting multiple modes in the same cavity resonator. A U-shaped slot and hook-shaped open circuited stubs are added to the HMSIW resonator to generate the transmission zeros (TZs) and hence increase the selectivity. The filters with high-selectivity a realways desirable in highly-sensitive radio frequency (RF) circuits. The proposed filter shows wide passband (FBW = 69.31%), lower insertion loss (IL <; 0.9 dB) and good selectivity.