Design of a compact wearable ultrawideband MIMO antenna with improved port isolation

Abstract

This communication presents a compact dual element wearable ultrawideband (UWB) multi-in multi-out (MIMO) antenna with increased port isolation. The suggested design consists of a jeans substrate in which a tree fashioned stub comprising of 8(eight) branches is introduced in the middle position of the partially etched antenna ground for improving the characteristics of port isolation. The proposed design occupies the frequency spectrum operating from 1.71 to 12.63GHz (impedance bandwidth of around 152.3 percent) and satisfies the bandwidth demands for WiMAX (3.2-3.8 GHz), WLAN (5.15-5.35/5.72-4.85 GHz), the C Downlink-uplink bands (3.7-4.2/5.9-6.425GHz), ITU bands (8-8.5GHz) and the downlink defense band (7.2-7.5GHz). The antenna is able to maintain isolation between the ports of > 22dB across the entire UWB frequency spectrum. The coefficient of the envelope correlation for the whole operating band was observed to be < 0.012 along with a very high diversity gain > 9.9. The channel power loss of the proposed wearable UWB MIMO antenna is found to be < 0.27 bit/s/Hz. The suggested UWB MIMO antenna, fascinated with optimization, covers an area of 35 x 35 mm 2. The suggested design is also able to perform satisfactorily when attached on-body. Simulation and testing fairly identified the performance of the antenna and rendered it to be an upstanding choice for wearable UWB applications.

A Miniaturized Full-Ground Dual-Band MIMO Spiral Button Wearable Antenna for 5G and Sub-6 GHz Communications

“…Several MIMO antennas were designed to resolve some of the wearable MIMO antennas’ challenges mentioned above. For example, a partially ground was used to improve the isolation for a wearable UWB MIMO antenna [ 42 ], a novel low-profile 5G MIMO antenna was designed on a rigid substrate to exhibit dual-band frequencies for 5G NR-n2 band (1.9 GHz) and safety band (ITS-5.9 GHz) in vehicular communication [ 43 ], and a quad-port smart textile UWB MIMO antenna with dimensions of 50 mm 2 designed for biohealthcare applications [ 44 ] (A comparison of these recent works are given in Table 1 ).…”

A Novel Two Ports MIMO Antenna Having Dual Stopped-band Functionality and Enhanced Isolation

“…In study [14], a UWB MIMO antenna having wearable jeans substrate is introduced to increase port isolation. The 35 × 35 mm 2 size antenna achieves an operating bandwidth of 1.71-12.63 GHz.…”