High gain UWB antenna array of partial conductor backed-coplanar waveguide (PCB-CPW) with coaxial fed for microwave imaging

Abstract

In this paper, a partial conductor backed-coplanar waveguide (PCB-CPW) UWB antenna array is proposed, which consists of four identical circular patches appropriately connected using quarter wave transformer transmission line. Currently full CB-CPW technique is used in realizing UWB high gain antenna. However, the combination of partial conductor back and array technique with coaxial fed is yet to be explored for the same purpose. The novel proposed antenna is designed with PCB-CPW using circular array radiating element and coaxially fed in producing UWB antenna with higher and acceptable gain compared to full CB-CPW technique. This is proved by achieving excellent impedance matching (<-10 dB) across the band of 2.6 GHz up to 13.1 GHz. In addition, the gain obtained across the whole operated frequencies is ranging from 3.4 dB until 12.12 dB. Considering the compactness of 80 mm × 45 mm, the performance of proposed antenna with coaxially fed making it a suitable candidate for portable and efficient systems for microwave-based brain imaging as the scanning probe.