Π-type reconfigurable coupler based on a complementary tunable method

Hong Peng, Peng Lei, Hong Yang, Shiwei Zhao and Xiaolun Ding

Journal of Electromagnetic Waves and Applications, 2021, vol. 35, issue 12, 1611-1618

Abstract: 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 \,\Omega $ 50/2Ω 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 \,\Omega $ 50/2Ω 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.

Date: 2021
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DOI: 10.1080/09205071.2021.1911687

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