定向耦合器的高功率小型化设计

Design of high-power small-size directional coupler

摘要:

利用奇偶模分析法对定向耦合器进行基本的描述与分析，利用HFSS软件辅助设计了一种三节3 dB定向耦合器。为解决此耦合器耐压低的问题，在耦合器的上下两板间引入了绝缘介质，设计了一种耦合为3 dB，最大输入功率不低于17 kW的定向耦合器。加入耦合介质，除了可以提高耦合器的输入功率外，还可缩减耦合器的尺寸，减小耦合器质量，并节约材料成本，从而实现了3 dB定向耦合器的高功率及小型化设计。

Abstract:

With the use of the even-odd mode analysis theory，a third-order 3 dB directional coupler is analyzed and designed by HFSS. On this basis，a ceramics chip is used as coupling medium，and a high-power third-order 3 dB directional coupler is analyzed and designed with the maximum input power above 17 kW. The adding of the ceramic chip can improve the coupler’s capability of voltage resistance and cut the size of the directional coupler, therefore high-power small-size coupling is achieved. This coupler can be applied to the high-power broadcasting transmitter system.