射电天文用太赫兹三通带频率选择表面设计

发布时间：2018-04-18 17:02

本文选题：频率选择表面 + 太赫兹　；参考：《物理学报》2015年17期

【摘要】：本文设计一种基于单屏改进型开口谐振环(SRR)的太赫兹频率选择表面(FSS).改进型SRR谐振单元由具有开口缝的金属贴片组成,开口缝的物理尺寸会影响其阶跃特征阻抗特性.本文通过对改进型SRR单元结构建立LC等效电路模型,提取等效电路模型参数,并结合传输线理论,得到FSS的基频计算公式和谐波关系式.相比于传统均匀SRR,本文所提出的改进型SRR多频带传输的控制更为灵活.基于此特点,设计了一款中心频率依次为0.46 THz,0.86 THz和1.03 THz,可应用于射电天文的三通带太赫兹FSS.采用电磁仿真软件对影响该FSS传输特性的关键参数、周期间隔、小型化程度以及入射角敏感性等重要指标进行分析研究.结果表明,改进型SRR三通带FSS在三个通带内的反射系数分别为-37.6 dB,-13 dB和-19.6 dB,在0°-60°范围内均具有稳定的频率响应特性,且具有小型化程度高、损耗低等特点.这种三通带FSS在太赫兹频段射电天文方面有潜在的应用价值.
[Abstract]:In this paper, a terahertz frequency selective surface (THz FSS) based on a single screen modified open resonant ring (SRR) is designed.The improved SRR resonant element is composed of metal patch with opening seam, and the physical size of the opening seam will affect its step characteristic impedance.In this paper, the LC equivalent circuit model is established for the improved SRR cell structure, and the equivalent circuit model parameters are extracted. Combining with the transmission line theory, the fundamental frequency calculation formula and harmonic relation formula of FSS are obtained.Compared with the traditional uniform SRR, the improved SRR multi-band transmission control is more flexible.Based on the above characteristics, a central frequency of 0.46 THZ 0.86 THz and 1.03 THZ is designed, which can be used in radio astronomy with terahertz FSs.The key parameters, cycle interval, miniaturization degree and incident angle sensitivity of the FSS are analyzed and studied by electromagnetic simulation software.The results show that the reflection coefficients of the improved SRR three-way band FSS in the three passbands are -37.6 dB -13 dB and -19.6 dB, respectively. The improved FSS has stable frequency response in the range of 0 掳-60 掳, and has the characteristics of high miniaturization and low loss.This three-way band FSS has potential application value in terahertz radio astronomy.
【作者单位】：华东交通大学信息工程学院射频通信与传感器网络江西省重点实验室;中国人民解放军73681部队;
【基金】：国家自然科学基金(批准号:No.61461020和U1431110) 江西省国际合作基金(批准号:20133BDH80007和20132BDH80013)资助的课题~~
【分类号】：P161

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