新型基片集成波导三孔定向耦合器的设计

利用矩形波导多孔定向耦合器理论和基片集成波导与矩形波导的等效关系,设计了基片集成波导三孔定向耦合器。通过在耦合孔的上金属面开哑铃形槽来增加能量的耦合,从而提出一种新型的三孔定向耦合器。实验结果表明:该耦合器在8.6 GHz-10.6 GHz的频率范围内,输入端反射系数和隔离口的电压传输系数均小于-15 dB,相对带宽达到20％,通带内直通口与耦合口的电压传输系数均在-8.2 dB--3.3 dB之间,耦合度约为6 dB,隔离度大于15 dB,性能获得了较大提高。该耦合器设计方法简单,加工成本低廉,可以广泛用于微波毫米波系统中。

Design of A New Three Apertures Directional Coupler Based on Substrate Integrated Waveguides

In this paper. a SIW three apertures directional coupler is designed by the theory of rectangular waveguide multi-aperture directional coupler and the equivalent relation between SIW and rectangular waveguide. Then, a new three apertures directional coupler is proposed through opening a dumbbell-shaped slot on the metallic surface of coupling aperture. The experiment result shows that the performance of the directional coupler is greatly enhanced. Within the frequency range of 8.6 GHz-10.6 GHz, the reflection coefficient of the input and transmission coefficient of the isolated port are both below -15 dB, and the relative bandwidth is 20%. Transmissions of the straight port and coupled port in the pass-band are between -8.2 dB and -3.3 dB. This coupler''s coupling is about 6 dB, and the isolation is over 15 dB.