SIW Multifunctional Device Integrated With Multi-State Diplexer and Multi-Channel Filtering Crossover
Lili Qu, Qun Li, Shuie Shi, Yonghong Zhang
Abstract
A multifunctional substrate integrated waveguide (SIW) device integrated with multi-state diplexer (MSD) and multi-channel filtering crossover (MCFC) is proposed in this brief. In addition, the MSD and MCFC functions can also coexist without mutual influence. The proposed device solves the problem that current multifunctional devices only share a single state, thereby being very suitable for frequency-hopping systems with high circuit utilization. In design, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{N}\times \text{M}$ </tex-math></inline-formula> SIW resonant cavities are cascaded, and three resonant modes, TE102, TE201, and TE301, are employed to realize three filtering channels. By properly arranging the feedlines and inductive coupling windows between the adjacent cavities, M+2-state diplexer and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{N}+\text{M}$ </tex-math></inline-formula> /2 crossed filtering channels are implemented. For validation, a prototype integrating with four-state diplexer (FSD) and two-channel filtering crossover (TCFC) is designed and fabricated, and the measured results show good agreement with the simulated ones.