volume | PIER Journals

Abstract

In this paper, a compact and highly isolated ultra-wideband (UWB) four-port multiple-input-multiple-output (MIMO) antenna design is proposed, employing coplanar waveguide (CPW) feeding technology. The antenna system is meticulously arranged on a 0.787 mm thick RO5880 substrate, occupying a footprint of 56 mm × 56 mm (1.5λ × 1.5λ). The design comprises four identically modified antenna elements orthogonally positioned. Each element consists of an Olympic ring-shaped radiating patch within a slotted frame and two fin-shaped ground planes with E-shaped slots. Additionally, a windmill-like decoupling structure formed by rotating stubs is introduced to further enhance performance. This layout not only optimizes the isolation between antenna elements but also enhances overall performance through its unique structural design, ensuring better signal stability and wider bandwidth. The antenna system achieves an impedance bandwidth ranging from 3.65 GHz to 13.95 GHz. A thorough examination was performed on various essential MIMO performance indicators, such as envelope correlation coefficient (ECC) and total active reflection coefficient (TARC). The findings reveal that the antenna exhibits outstanding performance in these aspects, with an ECC value under 0.0012 and a TARC value under -30 dB. These results underscore the considerable potential and high performance of the proposed UWB-MIMO antenna for diverse UWB applications.

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Dr. Chang Li

Professor Zhonggen Wang

Professor Wenyan Nie

Dr. Ming Yang