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Design and Evaluation of a Button Sensor Antenna for On-Body Monitoring Activity in Healthcare Applications

Ali, Shahid Muhammad; Sovuthy, Cheab; Noghanian, Sima; Saeidi, Tale; Majeed, Muhammad Faran; Hussain, Amir; Masood, Faisal; Khan, Shariq Mahmood; Shah, Syed Aziz; Abbasi, Qammer H.

Authors

Shahid Muhammad Ali

Cheab Sovuthy

Sima Noghanian

Tale Saeidi

Muhammad Faran Majeed

Faisal Masood

Shariq Mahmood Khan

Syed Aziz Shah

Qammer H. Abbasi



Abstract

A button sensor antenna for on-body monitoring in wireless body area network (WBAN) systems is presented. Due to the close coupling between the sensor antenna and the human body, it is highly challenging to design sensor antenna devices. In this paper, a mechanically robust system is proposed that integrates a dual-band button antenna with a wireless sensor module designed on a printed circuit board (PCB). The system features a small footprint and has good radiation characteristics and efficiency. This was fabricated, and the measured and simulated results are in good agreement. The design offers a wide range of omnidirectional radiation patterns in free space, with a reflection coefficient (S11) of −29.30 (−30.97) dB, a maximum gain of 1.75 (5.65) dBi, and radiation efficiency of 71.91 (92.51)% in the lower and upper bands, respectively. S11 reaches −23.07 (−27.07) dB and −30.76 (−31.12) dB, respectively, with a gain of 2.09 (6.70) dBi and 2.16 (5.67) dBi, and radiation efficiency of 65.12 (81.63)% and 75.00 (85.00)%, when located on the body for the lower and upper bands, respectively. The performance is minimally affected by bending, movement, and fabrication tolerances. The specific absorption rate (SAR) values are below the regulatory limitations for the spatial average over 1 g (1.6 W/Kg) and 10 g of tissues (2.0 W/Kg). For both indoor and outdoor conditions, experimental results of the range tests confirm the coverage of up to 40 m.

Journal Article Type Article
Acceptance Date Mar 15, 2022
Online Publication Date Mar 20, 2022
Publication Date 2022
Deposit Date Mar 28, 2022
Publicly Available Date Mar 28, 2022
Journal Micromachines
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 13
Issue 3
Article Number 475
DOI https://doi.org/10.3390/mi13030475
Keywords button sensor antenna; body centric communication; specific absorption rate (SAR)
Public URL http://researchrepository.napier.ac.uk/Output/2858444

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