太赫兹波导固定衰减器的设计

Design and research of THz waveguide fixed attenuator

随着太赫兹技术的迅速发展,太赫兹系统中使用的波导衰减器也成为研究热点。波导衰减器可以对太赫兹信号实现精确衰减和控制功率传输,在解决损耗、辐射和干扰等一系列问题中,具有特殊意义和不可替代的地位。而目前的波导衰减器将衰减片平行于电场放置在矩形波导内,破坏矩形波导传输线,容易造成射频泄露。本文基于吸收式波导衰减器工作原理,提出了一种衰减片垂直于矩形波导电场的波导固定衰减器,通过将衰减片贴在波导内壁,保证传输线完整。使用高频电磁仿真软件HFSS,通过改变衰减片的形状、位置等参数,优化回波损耗、衰减精确度等指标,最终完成110~170GHz波导固定衰减器的研制。在110~170GHz频率范围内,衰减器的回波损耗小于-27.5 dB,在20 dB的衰减时,衰减精确度小于±2 dB。

With the rapid development of THz technology,the waveguide attenuator used in THz system has also become a hotspot.The THz waveguide attenuator can accurately attenuate and control the power transmission,which shows special significance and plays an irreplaceable role in solving the problems of loss,radiation and interference.The current waveguide attenuator would destroy the wave guide transmission line and result in the RF leakage because it places the attenuation plate paralleling to the electric field.Based on the principle of the absorbent waveguide attenuator,a waveguide attenuator with the attenuation plate perpendicular to the electric field is proposed.The attenuation plate is attached to the inner wall of the waveguide.The waveguide attenuator is realized and optimized by using the HFSS software and changing the shape,position and other parameters of the attenuation plate.The return loss is less than-27.5 dB in 110-170 GHz,and the attenuator accuracy is less than±2 dB in the attenuation of 20 dB.