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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 564092, 12 pages
http://dx.doi.org/10.1155/2012/564092
Application Article

Design of Novel S-Shaped Quad-Band Antenna for MedRadio/WMTS/ISM Implantable Biotelemetry Applications

1Department of Electrical Engineering, National Cheng Kung University, Tainan 701, Taiwan
2Department of Electrical Engineering, Southern Taiwan University, Tainan 710, Taiwan
3Department of Electrical Engineering and Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan 701, Taiwan

Received 8 April 2012; Revised 31 May 2012; Accepted 3 June 2012

Academic Editor: Hon Tat Hui

Copyright © 2012 Chih-Kuang Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel S-shaped quad-band planar inverted-F antenna (PIFA) is proposed for implantable biotelemetry in the Medical Device Radiocommunications Service (MedRadio) band (401–406 MHz), Wireless Medical Telemetry Service (WMTS) band (1427–1432 MHz), and industrial, scientific, and medical (ISM) bands (433-434 MHz and 2.4–2.4835 GHz). The proposed antenna reveals compact dimension of 254 mm3 (  mm3) and is composed of three substrates and a superstrate, which are constructed from an S-shaped radiator (layer 1) and two twin radiators of spiral structures (layer 2 and layer 3). The optimal antenna characteristics were measured in the ground pork skin, and the measured bandwidths are 150 MHz for the MedRadio and ISM bands (433 MHz), 52 MHz for the WMTS band, and 102 MHz for the ISM band (2.4 GHz), respectively. The characteristics of proposed antenna are enough to support the applications of implantable body area networks (BAN) for biotelemetry and can completely cover main available frequency bands of BAN for biotelemetry below 3 GHz.