Circularly Polarized Wideband Fabric Stealth Multiple-Input Multiple-Output Antenna for Ultrawideband Applications Useful for Wireless Systems Wearable on Garments

Pillalamarri Laxman,Anuj Jain

doi:10.1155/2021/1426680

Abstract

Stealth wearable wireless devices are gaining much attention in the personal security and fashion designing industry. A multiple-input multiple-output wideband circularly polarized antenna wearable on a dress (textile-related), which is immune to bending, is described in this paper, where a wearable on fabric dress application uses the MIMO techniques. It consists of two multiple-input multiple-output types of antenna elements: the resonating elements are created resembling a beautiful peacock shape and the ground plane is appropriately designed. A voltage is applied to each antenna element; the ground plane contains a microstrip transmission line-fed and a rectangular upside-down L-shaped (vertically flipped) strip used for circular polarizing. The antenna covers a 3 dB axial-ratio-band-width (ARBW) value of 5.20–7.10 GHz and impedance bandwidth (S11 less than −10 dB) of 03.60–13.0 GHz. The proposed attachable wearable fabric (textile) multiple-input multiple-output wideband antenna exhibits envelope correlation coefficient (ECC) <0.02, diversity gain (DG) >9.96, channel capacity loss (CCL) <0.2 b/s/Hz, total active reflective coefficient (TARC) <−10 dB, mean effective gain (MEG) ratio within ±0.5 dB. There is dual-sense circular polarization in this antenna and high isolation between resonating elements (higher than 18). A specific absorption rate (SAR) of the proposed antenna for human tissues specimen is also discussed for different situations related to the human body. The overall size of the proposed CP textile MIMO antenna is 34 : 5 × 42 × 1 mm3. Because of its clothing layers (textile), practical performance, and miniature size, the designed MIMO antenna may be helpful for wearable on cloths on human body wireless devices and systems. The proposed antenna can be made unrecognizable because of the beautiful peacock design that can easily mix with the designs of fabric (in the fashion dress). The simulated antenna was fabricated with the help of conventional manual fabrication techniques and tested in real-time situations. The edge-to-edge distance amid the MIMO radiating antennas is 14.2 mm, and the achieved isolation is greater than 18 dB after optimization of the proposed antenna.

Highlights

Designers are paying considerable attention to wearable gadgets because of their numerous uses in hospital care, hobbies, map-reading, monitoring, and safety [1, 2]. e antenna element is a vital component of wearable on garment transceiver systems
The antenna’s ACBW varies drastically due to surface wave coupling. e multiple-input multiple-output (MIMO) antenna A is etched with a rectangular slot to improve its 3 dB axial ratio bandwidth (ARBW) as presented in Figure 7(b)
A two-port stealth circularly polarized (CP) textile MIMO antenna for wideband CP is proposed in this paper

Summary

Introduction

Designers are paying considerable attention to wearable gadgets because of their numerous uses in hospital care, hobbies, map-reading, monitoring, and safety [1, 2]. e antenna element is a vital component of wearable on garment transceiver systems. E antenna element is a vital component of wearable on garment transceiver systems. To radiate efficiently through bending, running, running, and movements, wearable/textile antennas are required. Antennas on textiles must be easy to integrate into minisized electronic gadgets or garments because they should be minisize, conformal, negligible in weight, bendable, tough, and miniature-sized [3]. Fabrication, antenna placement, and structural deformation are all factors to consider when designing textile antennas [4, 5]. In addition to their orientation suppleness, mobility, and invulnerability to multipath interference, wearable applications requiring wideband circularly polarized (CP) antennas are becoming increasingly attractive [6,7,8]. For establishing reliable channels and dealing with multipath fading, multielement antennas with polarization diversity are the best choice [9,10,11]

Methods

Results

Conclusion