Characters of frequency response of TM mode with the Tapered Double Sinusoidal Grooves structure operating at 0.35THz frequency

Xue-Yong Ding, Hong-rui Su, Lian-sheng Wang
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Abstract

In order to construct a cavity with a high-frequency and high-order single TM operating mode and also are favorable to the mode selectivity, the tapered double sinusoidal grooves structure is proposed. On the basis of ordinary sinusoidal grooves structure, the auxiliary sinusoidal distribution with smaller etching period is superimposed, and the taper is added on the inner and outer conductor walls to form the tapered double sinusoidal grooves coaxial Bragg structure. Through the FORTRAN software programming simulation experiments, we can see that it is different from the working mode TE mode. When the positive taper double sinusoidal grooves is adopted, the band gap overlap phenomenon deteriorates. The use of negative taper double sinusoidal grooves coaxial Bragg structure as the reflector can effectively suppress the band gap overlap phenomenon, the bandwidth gradually becomes wider as the increase of the taper angle, and the working mode TM62 and the competition mode TE61 can further separate. This provides a theoretical reference for the design of a coaxial Bragg reflector with a high-frequency and high-order single TM operating mode.
锥形双正弦沟槽结构在0.35THz频率下的TM模式频率响应特性
为了构建具有高频高阶单TM工作模式且有利于模式选择性的腔体,提出了锥形双正弦沟槽结构。在普通正弦沟槽结构的基础上,叠加蚀刻周期较小的辅助正弦分布,并在导体内外壁上增加锥度,形成锥形双正弦沟槽同轴布拉格结构。通过FORTRAN软件编程仿真实验,可以看出其工作模式不同于TE模式。当采用正锥度双正弦沟槽时,带隙重叠现象恶化。采用负锥度双正弦沟槽同轴布拉格结构作为反射器可以有效抑制带隙重叠现象,带宽随着锥度角的增大而逐渐变宽,工作模式TM62与竞争模式TE61可以进一步分离。这为设计高频高阶单TM工作模式的同轴布拉格反射器提供了理论参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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