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Optical Engineering

Effects of machining accuracy on frequency response properties of thick-screen frequency selective surface
Author(s): Chunyi Fang; Jinsong Gao; Chen Xin
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Paper Abstract

Electromagnetic theory shows that a thick-screen frequency selective surface (FSS) has many advantages in its frequency response characteristics. In addition, it can be used to make a stealth radome. Therefore, we research in detail how machining accuracy affects the frequency response properties of the FSS in the gigahertz range. Specifically, by using the least squares method applied to machining data, the effects of different machining precision in the samples can be calculated thus obtaining frequency response curves which were verified by testing in the near-field in a microwave dark room. The results show that decreasing roughness and flatness variation leads to an increase in the bandwidth and that an increase in spacing error leads to the center frequency drifting lower. Finally, an increase in aperture error leads to an increase in bandwidth. Therefore, the conclusion is that machining accuracy should be controlled and that a spatial error less than 0.05 mm is required in order to avoid unwanted center frequency drift and a transmittance decrease.

Paper Details

Date Published: 17 October 2012
PDF: 4 pages
Opt. Eng. 51(10) 103402 doi: 10.1117/1.OE.51.10.103402
Published in: Optical Engineering Volume 51, Issue 10
Show Author Affiliations
Chunyi Fang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jinsong Gao, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Chen Xin, Changchun Institute of Optics, Fine Mechanics and Physics (China)


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