30～150 MHz宽带双定向耦合器设计

摘要

This paper introduces the principle of the dual directional couplers based on three wire transformer magic T, analyzes the mechanism of series coupling signal and parallel coupling signal being synthesis by magic T with same and reverse phase, analyzes its characteristics of impedance transformation by using the telegraph equation, and obtains the best transmission conditions of the twisted three line transformer magic T. A kind of broadband dual directional coupler with a 30dB coupling is designed, and the test results satisfies the design requirements, which provides a theoretical basis for the design and optimization of broadband dual directional coupler.%介绍了基于三线变压器魔T的双定向耦合器工作原理,分析了串联耦合信号与并联耦合信号通过魔T进行同相和反相合成的机理,应用电报方程分析它的阻抗变换特性,得到扭绞三线传输线变压器魔T的最佳传输条件.设计了一种耦合度为30 dB的宽带双定向耦合器,并对其参数进行了理论分析和测量,满足设计要求,为宽带双定向耦合器的设计和优化提供了理论基础.