Ultrawideband, Dual-Linearly Polarized Tightly Coupled Dipole Array With Composite Wide-Angle Scanning Superstrate

We present an ultra-wideband (UWB) dual-linearly polarized tightly coupled dipole array (TCDA) with composite impedance matching superstrate for wide-angle scanning. The proposed design provides a superior performance of 10.6:1 bandwidth (1.8–19.1 GHz) with active voltage standing wave ratio (VSWR) less than 3 when scanning up to ±45° in both E and H planes, which is mainly due to use of double-layer composite frequency selective surface (FSS) impedance matching superstrate that contains two types of unit cells. Besides, the array achieves average efficiency of 80% by removing the resistive FSS layer between dipole and ground plane in conventional designs. The overall profile is 0.68λ
middle
, which makes the antenna suitable for the application of satellite communications.