Journal
IEEE ACCESS
Volume 8, Issue -, Pages 15687-15694Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2020.2967413
Keywords
On-body antenna; wideband antenna; wearable antenna; SAR; flexible antenna; biomedical antenna
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Funding
- Research Program through the National Research Foundation of Korea [NRF-2019R1A2C1005920]
- Deanship of Scienti~c Research at Majmaah University [1439-86]
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This paper presents a wideband, low-profile and semi-flexible antenna for wearable biomedical telemetry applications. The antenna is designed on a semi-flexible material of RT/duroid 5880 tex-math notation=LaTeX$\delta = 0.0004$ tex-math inline-formula) with an overall dimensions of 17 mm inline-formula tex-math notation=LaTeX>$\times25$ mm $\times0.787$ mm ( $0.2\lambda _{\circ }\times 0.29\lambda _{\circ }\times 0.009\lambda _{\circ }$ ). A conventional rectangular patch is modified by adding rectangular slots to lower the resonant frequency, and the partial ground plane is modified to enhance the operational bandwidth. The final antenna model operates at 2.4 GHz with a 10-dB bandwidth (fractional bandwidth) of 1380 MHz (59.7 & x0025; at the centre frequency of 2.4 GHz). The proposed antenna maintains high gain (2.50 dBi at 2.4 GHz) and efficiency (93 & x0025; at 2.4 GHz). It is proved from the simulations and experimental results that the antenna has negligible effects in terms of reflection coefficient, bandwidth, gain, and efficiency when it is bent. Moreover, the antenna is simulated and experimentally tested in proximity of the human body, which shows good performance. The proposed wideband antenna is a promising candidate for compact wearable biomedical devices.
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