Miniaturized UWB FSS for Space Shuttle Communication

An Ultra-wideband (UWB) Frequency selective surface (FSS) is proposed for Ku band space shuttle applications. A combination of circular loop (CL) on top layer and miniaturized square loop (MSL) on bottom layer of the substrate formed the proposed FSS. The FSS unit cell size is 5 mm x 5mm, which is designed on Fire-Retardant 4 (FR4) substrate with the thickness of 1.6 mm. The proposed FSS covers broad bandwidth range from 11.76GHz to 20.93GHz stop band frequency response. The FSS exhibits good angle of incidence and polarisation stability up to 60 degrees. The designed FSS is having a large fractional bandwidth of 9.17GHZ at -10 dB reference. We provide theoretical findings for both transverse Electric (TE) and transverse Magnetic (TM) polarisation at both normal and oblique incidence angles. For both straight-on and off-axis angles of incidence, theoretical results for TE and TM polarisation are presented.