一种高方向性弱耦合同轴耦合器的设计

Analysis and Design Method of a High-directivity Weak-coupling Coaxial Microwave Directional Coupler

从同轴定向耦合器的基本原理出发,提出了一种比较实用的高方向性弱耦合的同轴定向耦合器的模型。针对同轴定向耦合器端面的特性阻抗以及如何提高耦合器方向性或隔离度等问题进行了探讨。模拟与测试后的结果显示,此模型结构的同轴定向耦合器符合CDMA、W-CDMA和DCS等微波射频通信系统对于耦合度为35dB、隔离度大于65dB和驻波比小于1.05的同轴定向耦合器的指标要求。

This paper proposed a practical model for a high-direetivlty weak-coupling coaxial microwave coupler, based on the principle of coaxial directional coupler and a precise theoretical analyzing process. The characteristic impedances of the coupler＇ s end planes and the methods to improve the coupler＇s direetivity or isolation have also been discussed here. The simulations and test results show that the coaxial directional coupler with this model structure meets the requirements of microwave communication systems such as CDMA, W-CDMA, DCS for coaxial couplers having a coupling of 35 dB, a isolation of more than 65 dB and SWR less than 1.05.