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

A compact multiple input multiple output (MIMO) antenna operating at 2.45 GHz industrial scientific and medical band is presented for wearable devices. Open-end slotting is used to miniaturize the antenna dimensions. Inverted U-shaped ground stub is incorporated to reduce mutual coupling. On-body pe...

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Bibliographic Details
Published inInternational journal of microwave and wireless technologies Vol. 13; no. 1; pp. 76 - 86
Main Authors Gupta, Anupma, Kansal, Ankush, Chawla, Paras
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.02.2021
Subjects
Antenna Design, Modelling and Measurements
Antenna radiation patterns
Antennas
Bandwidths
Channel capacity
Computer simulation
Correlation analysis
Correlation coefficients
Design
Directivity
Distributed Ledger Technologies: Papers Arising from Three Australian Symposia
Electric properties
Human body
Mutual coupling
Performance enhancement
Wearable computers
Wearable technology
U-shaped ground stub
broadside radiation
wearable
MIMO
open-end slotting
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Summary:A compact multiple input multiple output (MIMO) antenna operating at 2.45 GHz industrial scientific and medical band is presented for wearable devices. Open-end slotting is used to miniaturize the antenna dimensions. Inverted U-shaped ground stub is incorporated to reduce mutual coupling. On-body performance is analyzed on a three-layered equivalent tissue phantom model. The wide bandwidth of 300 MHz and port isolation of 30 dB are obtained from measured results. The antenna shows the efficiency of 40% and directivity of 4.56 dBi when placed at a gap of “s” = 4 mm from the body. Broadside radiation pattern and low specific absorption rate make the antenna suitable for on-body communication. Further, diversity performance is measured in terms of envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss (CCL). The value of ECC is 0.025, DG is 9.98 dB, and CCL is 0.12 bits/s/Hz at 2.45 GHz. Antenna robustness is examined by bending the structure at different radii along the x-axis and y-axis. Performance of the proposed structure is reliable with structural deformation.
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ISSN:1759-0787
1759-0795
DOI:10.1017/S1759078720000471