A Balanced Tri-Band Substrate Integrated Waveguide Bandpass Filter With High Selectivity

Summary: A new design of half-mode substrate integrated plasmonic waveguide (HMSIPW) is proposed to achieve the characteristics of bandpass filter (BPF) and miniaturization by combining with spoof surface plasmon polariton (SSPP) structure. The experimental prototypes of the filters and diplexer have shown good agreement with the simulation results. The proposed designs have great potential in integrated devices and circuits for wireless communication systems.

Summary: In this study, a 60 GHz third-order on-chip bandpass filter based on half-mode substrate integrated waveguide technology is synthesized using GaAs pHEMT. The HMSIW cavity is divided into three resonators using two coupling slots, and a third-order Chebyshev BPF is designed with predicted characteristics through the synthesis method. A fabricated BPF sample with a bandwidth of 29.2% shows good agreement between simulations and measurements.