圆波导-矩形波导小孔耦合定向耦合器设计
Design of aperture-coupling directional coupler
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摘要: 设计了圆波导-矩形波导通过小孔耦合的定向耦合器装置，应用于高功率微波器件输出功率测量。利用弱耦合波理论分析了单孔耦合，对单孔耦合进行了理论分析和数值计算，并在HFSS中模拟了中心频率34 GHz、耦合度－40 dB的TE01TE10单孔耦合，将数值计算结果和模拟结果进行了对比，两者最大差值为0.4 dB, 相对误差近1%，从而证实理论分析和数值计算的正确性，证实了此种单孔耦合器不具备定向耦合的条件。在单孔耦合的基础上利用相位叠加原理详细分析了多孔定向耦合阵列原理，得出多孔耦合器且满足反向相位相消的条件才具备定向耦合；为设计此种定向耦合器提供了设计理论和参考依据。在实际加工中只要给出标定的耦合度和方向性系数就可以确定耦合孔尺寸。Abstract: A aperture-coupling directional coupler between rectangular waveguide and circular waveguide through small aperture was designed to measure the output power of high power microwave devices. The formulas of single-hole coupling degree were made out with loose-coupling theory. Numerical computation of aperture was made by MATLAB. The compared results show that the theory was reasonable. Based on the results of single hole coupling, some useful conclusions were derived about multi-hole coupling. Single hole coupler can not realize directional coupling, but even numbers of holes can.The results are ualuable for theoretical research and application as well．
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