Miniaturised frequency selective surface based on fractal arrays with square slots for enhanced bandwidth

• DOI: 10.1049/iet-map.2018.5224
• Publication Date: 2019-05-15T02:50:40Z
• Authors: Rana Sadaf Anwar; Yuan Wei; Lingfeng Mao; Huansheng Ning
• Keywords: Selective surface; Square (algebra); Fractional bandwidth; Fractal antenna

A novel approach is used to miniaturise the array size and broaden bandwidth (BW) of a multilayer antenna‐filter antenna‐ based frequency selective surface (FSS). Although such FSSs have broadly been investigated for higher selectivity less thickness, they still own high periodicity lower BW. The proposed fractal FSS with centre square slots consists three metallic layers, separated by two dielectric substrates unit cell sub‐wavelength order (0.2 λ ₒ). Central are added in external Minkowski patches increase capacitive effect whereas etched on ground placed middle enhanced coupling. It demonstrated through simulations that design can effectively minimise element enhance Owing minuscule symmetric geometry, presented structure insensitive incidence angles (up 30°) both polarisations. prototype also fabricated tested microwave anechoic chamber. An equivalent circuit model, full wave simulation measurement results agree well demonstrate stable response 3 dB fractional BW approaching 87.4 92%, respectively, at normal angle incidence.