An SRR based miniature implantable antenna with a slit loaded ground at MedRadio and ISM bands for biotelemetry applications


YAMAÇ Y. E., BAŞARAN S. C.

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, vol.30, no.11, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 11
  • Publication Date: 2020
  • Doi Number: 10.1002/mmce.22406
  • Journal Name: INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: biotelemetry, implantable antenna, MedRadio and ISM bands, split ring elements, MONOPOLE ANTENNA, DESIGN, COMPACT, SKIN, WLAN, MICS
  • Akdeniz University Affiliated: Yes

Abstract

A miniaturized implantable microstrip split-ring antenna (IMSRA) is proposed for wireless biotelemetry. The IMSRA takes up a miniaturized volume of 153.35 mm(3)(10.5 x 11.5 x 1.27) and provides a dual-band operation in 360 to 620 MHz and 2.32 to 2.54 GHz that covers The Medical Device Radiocommunications Service (MedRadio) (401-406 MHz) and Industrial, Scientific, and Medical (ISM) (433-434 MHz and 2.4-2.48 GHz) bands. The principal part of the radiator consists of three homocentric split-ring elements. In addition, three conductor paths located between the split rings are used for precise adjustment of the frequency. In order to reduce the antenna size, a shorting pin is appropriately inserted between one of the metallic rings and the ground plane. The impedance matching of the antenna is improved by the use of a hook-shaped slit placed on the ground plane. For verification of the in vivo operation, the proposed IMSRA was measured in two separate skin-mimicking gels for MedRadio and ISM bands. A prototype was also tested in the skin tissue sample of a donor rat. The proposed antenna offers 53% (360 similar to 620 MHz) bandwidth at 490 MHz and 9% (2.32 similar to 2.54 GHz) bandwidth at 2.43 GHz. The IMSRA exhibits well-behaved radiation patterns and SAR values at the respective bands.