A complementary tunable method is proposed based on the Hybrid coupler. The odd-even mode analysis shows that the method can achieve continuously tunable power division ratio by changing two $50/\sqrt{2}\mathrm{\Omega }$ transmission lines in the circuit, and it can achieve larger tunable range by improving the complementary tunable method based on the cascaded Hybrid coupler. Using the improved method, a novel π-type reconfigurable coupler, which works at 2.45 GHz, is designed by replacing $50/\sqrt{2}\mathrm{\Omega }$ transmission lines with π-type circuit. The power division ratio of the fabricated reconfigurable coupler is changed in the range of −20.5–21.3 dB, with the bias voltage being 0∼6 V; meanwhile, the isolation and return loss are above 20 dB.

提出了一种基于混合耦合器的互补可调方法。奇偶模分析表明，该方法可以通过改变两个$50/\sqrt{2}\mathrm{\Omega }$通过改进基于级联混合耦合器的互补可调方法，可以实现更大的可调范围。采用改进方法，设计了一种工作频率为 2.45 GHz 的新型 π 型可重构耦合器。$50/\sqrt{2}\mathrm{\Omega }$传输线采用π型电路。制作的可重构耦合器的功分比在-20.5~21.3 dB范围内变化，偏置电压为0~6 V；同时，隔离度和回波损耗均在 20 dB 以上。