耦合度可切换的太赫兹分支波导定向耦合器

Terahertz Branching Waveguide Directional Coupler with Switchable Coupling Degree

提出了一种耦合度可切换的太赫兹分支波导定向耦合器,该耦合器的耦合度可在3和10 dB之间进行切换。通过控制前四条分支表面二氧化钒薄膜的电导率,实现耦合度的切换。仿真结果表明,在180~250 GHz的频率范围内,当二氧化钒电导率为2×10^(5)S/m时,耦合度为(3±0.6)dB,隔离度与回波损耗大于17 dB;当二氧化钒电导率为10 S/m时,耦合度为(10±0.7)dB,隔离度大于18 dB,回波损耗大于20 dB。耦合器在两种耦合状态下均表现出优异的性能,符合设计预期。

This study proposes a terahertz branching waveguide directional coupler with a switchable coupling degree.The coupling degree is switched by controlling the conductivity of the vanadium dioxide film on the surface of the first four branches.The simulation results demonstrate that within the frequency range of 180~250 GHz,the coupling degree is(3±0.6)dB.The isolation and return losses exceed 17 dB when the vanadium dioxide conductivity is 2×10^(5)S/m.Similarly,for a vanadium dioxide conductivity of 10 S/m,the coupling degree is(10±0.7)dB.The isolation and return losses are>18 and 20 dB,respectively.The coupler performs exceptionally well under both coupling states,satisfying the design expectations.