Abstract
The authors report the design of an ultra-wideband (UWB), dual-polarised, tightly coupled dipole array (TCDA) with an integrated balun for wide-angle scanning. A dual-pol dipole design enables massive bandwidth, large scanning volume, and high polarisation purity, concurrently. To achieve wide-angle impedance matching without exciting surface waves, two types of superstrates are evaluated on a finite array: (i) dielectric superstrate and (ii) novel planar frequency-selective surface (FSS). The latter architecture is capable of scanning 70° in E- plane and 65° in H- plane and shows, on average, 5° scanning improvement to the former. The impedance bandwidth is 5.25:1 (0.8-4.2 GHz) at the broadside (voltage standing wave ratio (VSWR)<;2). The bandwidth reduces to 4.3:1 (0.9-3.9 GHz) when the maximum scanning angle or θ max increases to 65° for the H -plane and 70° for the E -plane (VSWR <; 3.2). The proposed array is a great candidate for wide-angle wideband scanning applications covering the entire L and S bands.
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