Analysis of Electrical and RCS Performance of a Cone-type Dual-band Bandpass Radome

This paper describes the manufacturing process and electrical performance test of a cone-type dual-band bandpass radome with a frequency selective surface (FSS) of a dual-ring structure. The radome has a base diameter of 500 mm, a vertical height of 321mm and a wall thickness of 2 mm. Use autoclave curing molding technology to produce samples. The experiment mainly tests the power transmission coefficient and aiming error of the radome in Ku frequency band (central frequency point f0 =13. 28 GHz) in horizontal polarization and vertical polarization. The final experimental results show that the minimum power coefficient of the radome is 75% at the design frequency point f0 in Ku band. More than 70% bandwidth reaches 1. 1 GHz or above; The maximum line-of-sight error at the design frequency point is 18. 87′, the maximum line of sight error under horizontal polarization is 11. 37′, less than 20′bandwidth is 0. 5 GHz and 1. 3 GHz, respectively. It shows that the radome has good transmission characteristics in the passband and cut-off characteristics outside the passband, and has good aiming ability. Meanwhile, the radar cross sections (RCS) of pure media surface samples and dual-frequency bandpass FSS surface samples are measured in the range of HH/ VV polarization and forward ±60°. The test results show that the mean RCS of point frequency is less than -10 dB, and the RCS reduction is not less than 10 dB.