4.7 Article

Circularly Polarized Miniaturized Implantable Antenna for Leadless Pacemaker Devices

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 8, 页码 6423-6432

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2022.3161370

关键词

Circular polarization; compact size; implantable antenna; U shaped structure

资金

  1. [PID2019109984RB-C41]
  2. [RTC-2017-6394-7]

向作者/读者索取更多资源

This article presents a compact circularly polarized implantable antenna operating at 915 MHz, achieving circular polarization by using a unique structure. The antenna has a small size and high gain.
A compact circularly polarized (CP) implantable antenna working at 915 MHz, at the industrial, scientific, and medical (ISM) band, is developed in this article. The proposed radiator is based on a fully planar and low-profile patch antenna with a ground plane and different slots but without any via holes, which makes the structure a good candidate for implantable devices. The circular polarization is achieved by means of introducing a surrounding and asymmetrical U-shaped structure. A meander line has been included in the inside of the U-shaped structure to increase the electrical length of the antenna without increasing its mechanical dimensions. An impedance bandwidth of 18.9% from 810 to 980 MHz and an axial ratio of 17.2% from 850 to 1010 MHz have been achieved. The proposed antenna has a compact size of 5.2 x 5.6 x 0.25 mm(3), which seems to be the smallest antenna over the recently reported implantable antennas. In addition, the proposed antenna achieves a relatively high gain value of -23 dBi.

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