A bandwidth enhanced 915 MHz antenna for IoT wrist-watch applications

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A bandwidth enhanced 915 MHz antenna for IoT wrist-watch applications

Kumar, Sanjeev; Buckley, John; Barton, John; Newberry, Robert; Dunlop, Gary; Rodencal, Matthew; Webster, Carlo; O'Flynn, Brendan
Date: 2019
Copyright: © 2019, European Association on Antennas and Propagation (EurAAP). All rights reserved.
Related: https://www.eucap.org/
https://www.eucap.org/files/eucap-2019-final-programme-update
Citation: Kumar, S., Buckley, J. L., Barton, J., Newberry, R., Dunlop, G., Rodencal, M., Webster, C. and O’Flynn, B. (2019) 'A bandwidth enhanced 915 MHz antenna for IoT wrist-watch applications', 13th European Conference on Antennas and Propagation (EuCAP 2019), Krakow, Poland, 31 March-5 April.

Abstract:

This paper presents a 915 MHz planar inverted-F antenna (PIFA) topology for a wrist-worn wireless sensor application. When compared with a conventional PIFA implementation, an impedance bandwidth enhancement of more than 100% is achieved. The bandwidth enhancement is realized with inclusion of a parasitic element that excites an additional mode close to the resonant frequency. A parametric analysis of the key parameters is performed in order to optimize the antenna for 915 MHz operation. The measured results for the on-body prototype antenna show a -10 dB bandwidth of 26.4 MHz and a Peak Realized Gain of -0.57 dBi at 915 MHz. The simulated peak radiation efficiency of 46.8% is achieved. In addition, the design exhibits a low specific absorption rate (SAR) value of 0.004 W/kg.

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