Design and Packaging of an Eye-Shaped Multiple-Input–Multiple-Output Antenna With High Isolation for Wireless UWB Applications

This paper presents a bandwidth enhanced, compact, multiple-input-multiple-output (MIMO) antenna with high isolation for modern wireless ultrawideband (UWB) applications. The proposed antenna consists of two simple eye-shaped slot radiators, and in order to enhance isolation, the proposed antenna uses a rectangular-shaped ground plane with an extruded T-shaped stub. The antenna characteristics such as the S-parameters, realized gain, surface current distributions, and radiation patterns are investigated. Furthermore, the diversity performance of MIMO antenna in terms of envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and multiplexing efficiency is also studied. The designed antenna shows the impedance bandwidth of 17.2 GHz (from 2.8 to 20 GHz) with a compact size of 18 × 36 mm
²
. The antenna possesses a low mutual coupling of less than -20 dB over the operating band, the ECC and the DG are less than 0.02 and greater than 9.95 dB, respectively. The prototype is fabricated and tested for impedance and radiation characteristics. The proposed antenna when installed on a printed circuit board with a standard size, with USB connector, and device housing and various other types of housing show good performance. The proposed MIMO/diversity antenna can be a good candidate for portable UWB applications.