太赫兹波段频率选择表面的设计与测试

Design and measurement of terahertz Frequency Selective Surface

讨论了太赫兹波段频率选择表面(FSS)在天文探测、遥感卫星以及航天器辐射计系统中的应用。对太赫兹波段频率选择表面的设计、加工及测试方法进行了研究。介绍了太赫兹波段频率选择表面的设计、分析方法及电磁仿真软件。由仿真及实测结果可知,太赫兹频段的频率选择表面由于受限于物理尺寸,造成了设计、加工及测试上的困难,其性能与其他频段相比更易于受到加工精确度的影响。在实际加工过程中,应尽量采用微纳加工技术进行加工。而在设计频率选择表面时,应当充分考虑器件厚度以及单元形状对加工造成的影响。测试过程中应当尽量避免反射回路造成的多次回波。

The applications of terahertz Frequency Selective Surface(FSS) in radioastronomy, satellite remote sensing, and air borne radiometers have been reviewed, with the focus placed on the design, fabrication and testing of terahertz FSS.Numerical methods and commercial electromagnetic software are discussed for FSS design and analysis. Due to the physical dimension of terahertz FSS, the performance is subjected to the fabrication precision compared to their counterparts in lower frequency range. In consequence, micro/nano-fabrication techniques are preferred in the fabrication. Fabrication precision should be included in the design phase. Multi-echo waves should be avoided in the testing.