Development of Stealth Technology for Unmanned Aerial Vehicles Using Circuit-analog Radar Absorbing Structures

• Main Authors: HO, LING-CHANG, 何玲璋
• Other Authors: YANG, RUEY-BIN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/17799518951465877765

碩士 === 逢甲大學 === 航太與系統工程學系 === 105 === In this study, the radar cross section (RCS) of the entire unmanned aerial vehicle (UAV) at 10 GHz is calculated by the physical optics (PO) method and the method of moment (MoM) by using the high frequency electromagnetic simulation software ANSYS HFSS. This study uses MoM and the domain decomposition method to overcome the high frequency calculation problem. PO is also used to obtain the electric current distribution over the UAV and locate the bright returns of RCS. The radar absorbing structure (RAS) with dual functions of high-strength performance and broadband microwave absorption is designed with the incorporation of a frequency selective surface (FSS) with two-dimensional arrays and finite surface resistance. In this study, FSS is fabricated by a low-cost screen-printing technique with conductive carbon ink instead of the high-cost sputtering deposition method. The bright high scattering area is then further covered with a layer of RAS to reduce the RCS of the UAV. The results show that the UAV covered with 3-mm-thick RAS can maximally reduce the RCS from 11.71 dBsm to -6.33 dBsm at 10 GHz, i.e., from 14.82 m^2 to 0.232 m^2 which significantly improves the stealth capability of the UAV.