Investigation on decoupling of wide band wearable multiple‐input multiple‐output antenna elements using microstrip neutralization line

Abstract

An investigation to enhance the decoupling between the elements of a compact wide band multiple-input multiple-output (MIMO) antenna is presented in this communication. A microstrip neutralization line (NL) is designed on the top of antenna surface to enhance the port isolation. The geometry is embedded on a jeans material to be apposite for the on-body wearable applications. The antenna covers the frequency spectra from 3.14 to 9.73 GHz (around 102.4%) and fulfills the bandwidth requirements of WiMAX (3.2-3.8 GHz), GHz), C band downlink-uplink (3.7-4.2/5.9-6.425 GHz), downlink defense (7.2-7.7 GHz), and ITU (8-8.5 GHz) bands. The port isolation is found to be more than 32 dB over the whole application bands. The antenna is appraised in a rich scattering environment with very minimal envelope correlation coefficient (ECC < 0.12) and great amount of diversity gain (DG > 9.8). The proposed MIMO antenna system is able to achieve the channel capacity loss (CCL) of less than 0.2 BPS/Hz throughout the whole operating band. The proposed structure is etched on an area of 30 × 50 mm 2 . The simulated and measured performances of the proposed antenna are in well-matched state.

Design of a wearable MIMO antenna deployed with an inverted U-shaped ground stub for diversity performance enhancement

“…To support the MIMO capability of the proposed antenna, important diversity parameters envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL) are analyzed as explained in [16, 18]. ECC signifies the correlation of antenna radiation pattern with another antenna when operated in closed proximity.…”

“…Very few literatures are available for wearable MIMO antenna structures. Dual-band textile MIMO antenna [14], ultra-wide band (UWB) MIMO antenna with a decoupling structure [15], and neutralization line-based UWB MIMO antenna [16] for wearable device have been investigated but [14–16] are designed using textile materials, possess large footprints, and their performance is also affected due to wrinkling, crumpling, and environmental effects. Ground radiation-based loop antenna with two inductive radiators [17], circular co-radiator antenna with high impedance surface [18], and four-element octagonal ring-shaped MIMO [19] are designed for wearable MIMO devices.…”

A CPW-Fed Dual-Band Mimo Antenna With Enhanced Isolation for 5g Application

“…The parameter of total active reflection coefficient (TARC) represents a characteristic curve of overall reflection coefficient. With regard to a MIMO antenna with two elements, the evaluation of TARC is calculated as [20]:…”

A Compact CPW-Fed Triple-Band Mimo Antenna With Neutralization Line Decoupling for Wlan/Wimax/5g Applications

“…Recently, many MIMO antennas with triple bands have been proposed [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The antennas with triple-band form without any isolation branches are reported in [3][4][5][6][7].…”