Design and Analysis of Frequency Selective Surface for Airborne Radome Wall Application

In this paper, we present a frequency selective surface (FSS) working at X-band for application of airborne radome. A dipole unit cell FSS is designed and simulated. Further, the FSS is simulated into 3×3 dipole array and A-sandwich radome wall design to check the behavior of the EM wave after passing the FSS. The proposed FSS and FSS based radome wall is analyzed with different incident angles (0°, 10°, 20°, and 30°) for both the structures. The suggested band-pass dipole FSS structure has dimension of 10mm×10mm×1.54mm with two conducting rings (thickness 0.035mm) having a plus sign in the middle is embedded on either side of the core layer (ɛr = 3.5 and tanδ = 0.003). The -10 dB relative bandwidth (BW) of the suggested single element is from 9.6 - 10.7 GHz and with a very good insertion loss (IL) of 0.1 dB. Moreover, the single element A-sandwich radome wall structure has a dual band from 8.08 to 10.53 GHz and 10.56 to 12.35 GHz with better IL of 0.1dB and 0.05dB from the two bands respectively. The proposed system is designed and simulated on CST Microwave Studio.