基于慢波基片集成波导的X波段功分器设计

针对传统基片集成波导（substrate integrated waveguide，SIW）功分器设计中宽带化和小型化不易兼顾的问题，提出了一种基于慢波SIW（slow-wave SIW, SW-SIW）的功分器. 采用微带折线构成的慢波结构单元加载于SIW金属表面上，代替传统SIW连续的金属表面，与同尺寸的SIW相比，SW-SIW的截止频率下降了40%，能够实现横向尺寸的缩减，尤其当SW-SIW达到与SIW相同的相移量时，SW-SIW所需纵向尺寸更小. 所提出的基于SW-SIW的功分器在具有较宽带宽的同时实现了器件尺寸的减小. 通过测试结果可得，该功分器在8.25～12.8 GHz频带内的反射系数|S₁₁|

Design of X-band power divider based on slow-wave substrate integrated waveguide

To solve problem that it is not easy to account both broadband and miniaturization in the design of traditional substrate integrated waveguide (SIW) power divider, a power divider based on slow-wave substrate integrated waveguide (SW-SIW) is proposed in this paper. The slow-wave structure units composed of microstrip lines are loaded on the metal surface of SIW instead of the continuous metal surface of traditional SIW. Compared with SIW of the same size, the cut-off frequency of SW-SIW is decreased by 40%, which can reduce the lateral size of the substrate integrated waveguide. When SW-SIW and SIW have the same phase shift, the longitudinal dimension of SW-SIW is smaller than SIW. The proposed power divider based on SW-SIW is achieved a size reduction with a wide bandwidth. The measurements show that the power divider has a bandwidth of 43.2% from 8.25 GHz to 12.8 GHz with the reflection coefficient |S₁₁| less than ?10 dB. The phase consistency is good, and the miniaturization effect is obvious, so the proposed power divider is suitable for the application of compact microwave radio frequency front-end.