Dual-Wideband Antenna with Dual Polarization and Enhanced Front-to-Back Ratio for High-Speed Communication Applications

Abstract

The proposed antenna introduces a dual-wideband, dual-polarization design, employing Y-shaped bowtie radiators strategically positioned on both sides of an FR-4 substrate. This configuration aims to achieve polarization diversity, a crucial aspect in enhancing the performance and efficiency of wireless networks. To achieve this, improvements were made in radiation characteristics, particularly the front-to-back ratio (FBR), through the incorporation of a ring reflector and director. This led to an impressive average FBR enhancement of 7.38 dB at the lower band (LB), and 4.94 dB at the upper band (UB), respectively. Furthermore, the reflector and director height in relation to the radiator was meticulously adjusted to achieve a low-profile structure of dimensions 0.340λ0 × 0.340λ0 × 0.126λ0 (at 0.698 GHz). The antenna features both horizontally and vertically positioned radiators, each fed by two ports. It demonstrates an extensive overlapping impedance bandwidth (IBW) (S11 < -10dB) of 0.68-0.99 GHz (37.8%), and 1.62-2.99 GHz (61.9%) in the LB and UB for both radiators, with port isolation exceeding 18 dB. Alongside dual polarization and an enhanced FBR, the radiator exhibits a gain beyond 4.8 dBi and a radiation efficiency better than 70%, making it an exceptional choice for applications requiring high-speed wireless communication.