碩士 / 逢甲大學 / 航太與系統工程學系 / 107 / In this study, ITO is used to fabricate frequency selective surfaces (FSS) and the PMMA and PET are incorporated to design an optically transparent radar absorbing structure (OT-RAS) which can be applied to stealth canopy. For X-band (8~12 GHz) and Ku-band (12~18 GHz), the optimal design of OT-RAS is carried out with Ansoft Designer from seven different FSS patterns. The results show that OT-RAS designed by Jerusalem Cross has the absorption bandwidth of −10 dB at 6.5~18 GHz and the maximum oblique incident angle with absorption for TE waves is 30°.
The RCS of a metal plate calculated by ANSYS HFSS-IE at 10 GHz decreases from 13.7 dBsm to -0.60 dBsm for the corresponding OT-RAS plate. The RCS of a metalic semi-cylindrical shell decreases from −2.26 dBsm to −16.2 dB for OT-RAS covered semi-cylindrical shell. FSS is fabricated by etching ITO film through laser lithography. The absorption and RCS of the OT-RAS panel measured in an anechoic chamber are consistent with the simulated results.
A scaled F-22 canopy is fabricated with the design OT-RAS with Jerusalem Cross FSS. The RCS measurement shows that the maximum peak values is −18.1 dBsm for the metal canopy and −25.6 dBsm for the OT-RAS canopy. The overall RCS reduction is great than 7.5 dBsm which shows low observability for the novel OT-RAS canopy.
Keywords: frequency selective surface, optically transparent radar absorbing structure, radar cross section, stealth canopy
| Identifer | oai:union.ndltd.org:TW/107FCU00295017 |
| Date | January 2019 |
| Creators | CHEN,HSU-MIN, 陳栩民 |
| Contributors | YANG,RUEY-BIN, 楊瑞彬 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 81 |
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