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Micromachines 2019, 10(1), 70;

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

School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China
School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510641, China
Author to whom correspondence should be addressed.
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)
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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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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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