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A Compact Broadband Antenna with Dual-Resonance for Implantable Devices
Open AccessArticle

A Miniaturized Circularly-Polarized Antenna for In-Body Wireless Communications

1
School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China
2
School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(1), 70; https://doi.org/10.3390/mi10010070
Received: 5 December 2018 / Revised: 10 January 2019 / Accepted: 16 January 2019 / Published: 19 January 2019
(This article belongs to the Special Issue Implantable Microdevices)
A novel miniaturized single-fed circularly-polarized (CP) microstrip patch antenna operating in the Industrial, Scientific, Medical (ISM) band of 2.40–2.48 GHz, is comprehensively proposed for implantable wireless communications. By employing reactive loading in the arrow-shaped slotted patch to form slow wave effect and embedding V-shaped slots into patch to lengthen the current path, the proposed implantable antenna is minimized with the overall dimensions of 9.2 mm × 9.2 mm × 1.27 mm. The radiation patterns of the proposed antenna illustrate the performance of left-handed circular polarization. The simulated results show that an impedance bandwidth of 7.2% (2.39–2.57 GHz) and an axial ratio bandwidth of 3.7% (2.39–2.48 GHz) at the ISM band are achieved, respectively. Ex vivo measured results are in good agreement with the corresponding simulated ones. View Full-Text
Keywords: circular polarization; implantable antenna; reactive loading; slow wave effect circular polarization; implantable antenna; reactive loading; slow wave effect
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MDPI and ACS Style

Fan, Y.; Liu, X.; Li, J.; Chang, T. A Miniaturized Circularly-Polarized Antenna for In-Body Wireless Communications. Micromachines 2019, 10, 70.

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