Second-Order Terahertz Bandpass Frequency Selective Surface With Miniaturized Elements
Second-Order Terahertz Bandpass Frequency Selective Surface With Miniaturized Elements
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DOI：
10.1109/tthz.2015.2452813
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发表时间：
2015-09-01
影响因子：
3.2
通讯作者：
Abbott, Derek
中科院分区：
文献类型：
--
作者：
Ebrahimi, Amir;Nirantar, Shruti;Abbott, Derek
提出并设计了一种用于太赫兹波段的小型化二阶频率选择表面。FSS由两层金属阵列组成，两层金属阵列之间由聚合物介质间隔层隔开。前层和后层上的单位晶胞小于lambda（0/5），其中lambda（0）是自由空间波长。通过一个电路模型描述了所提出的频率选择表面的工作原理，并给出了一种设计所需滤波响应的综合方法。一个原型的频率选择表面合成工作在0.42太赫兹的中心频率与45%的分数带宽。采用微细加工工艺制作了所设计的FSS。性能评估，通过使用太赫兹时域光谱。测量结果表明，对于TE和TM偏振，FSS响应对斜入射角的敏感性较低。
In this paper, a second-order frequency selective surface (FSS) made of miniaturized elements is proposed and designed for terahertz applications. The FSS is composed of two layers of metallic arrays separated from each other by a polymer dielectric spacer. The unit cells on the front and back layers are smaller than lambda(0/5), where lambda(0) is the free space wavelength. The operation principle of the proposed FSS is described through a circuit model, and a synthesis procedure is presented for designing a desired filtering response. A prototype of the FSS is synthesized to operate at a center frequency of 0.42 THz with 45% fractional bandwidth. The designed FSS is fabricated by using microfabrication process. The performance is evaluated by using terahertz time-domain spectroscopy. Measurement results show a low sensitivity of the FSS response to oblique angles of incidence for both of the TE and TM polarizations.