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本文导出了多孔波导定向耦合器的精确分析方法,该方法用来研究用一般理论和新的综合技术设计的耦合器性能。这个分析是基于耦合器的等效四端口网络,耦合孔用集中电抗表示。这些电抗与表示波导的色散传输线串联、并联、或者串并联。孔的大小和公共壁厚度的影响已加以考虑。根据一阶松耦合近似法设计的许多耦合器都具有良好的方向性,甚至对于紧耦合(3dB)也是如此,但是,以前的理论没有给出予测方向性,并且常常偏离最佳设计值很远。基于分布于低通原型滤波器的新综合技术已经发明,同时,该技术给出的结果与予测的性能吻合。用这个理论设计的紧奏的多孔定向耦合器,在整个波导工作频段上,具有大于43dB 的方向性。
In this paper, we derive an accurate method to analyze the directional coupler with porous waveguide, which is used to study the performance of the coupler designed with the general theory and the new integrated technology. This analysis is based on the equivalent four-port coupler network and the coupling holes are represented by a centralized reactance. These reactances are in series, parallel, or series-parallel with the dispersive transmission lines that represent the waveguides. The effect of hole size and common wall thickness has been taken into account. Many couplers designed according to the first-order loosely-coupled approximation have good directivity, even for tight coupling (3dB), but previous theories did not give predictive directivity and often deviated from the optimal design value far. The new synthesis technique based on the low-pass prototype filter has been invented. At the same time, the result given by this technique is consistent with the predicted performance. The tightly-piloted, porous, directional coupler designed with this theory has directivity greater than 43 dB over the entire waveguide operating band.