电感补偿高方向性的微带定向耦合器

定向耦合器作为一种重要的微波元件在微波电路与微波集成电路中有着广泛的应用。在传统的微带线定向耦合器设计中,奇偶模之间不同的相位速度导致了较低的隔离度。目前提高方向性的手段大多采用电容加载或者再注入的补偿手段,其实现方式均属于对相位速度的补偿。介绍了一种采用对称的电感加载结构进行相位速度补偿的微带线定向耦合器,为了提高微带定向耦合器的方向性,通过对微带线定向耦合器的4个端口进行感性加载,实现了微带定向耦合器窄带的低损耗和高方向性的电气指标,通过实物制作与测试,证明了方法可以实现。

High Directivity Microstrip Parallel Coupler Using New Inductive Compensation Technique

The microstrip directional coupler is a very important component of microwave system.Because of the imbalance of the even and odd mode effective phase velocities,conventional design of the microstrip directional coupler shows a poor directivity.Many means have been studied such as capacitive compensation or re-entrant mode method to improve the directivity.This paper presents an improved inductive compensation technique to enhance the directivity of a microstrip parallel coupler with low insertion loss.The validity of the improved inductive compensation technique for enhancing the directivity is demonstrated by the test result.