A Miniaturized Circularly Polarized Implantable Annular-Ring Antenna

A novel miniaturized circularly polarized (CP) annular-ring microstrip antenna with a smooth profile is presented for Industrial, Scientific, and Medical (ISM) band (2.4-2.48 GHz) implantable applications. The radiating element of the antenna consists of an annular ring and a central circular patch....

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2017-01, Vol.16, p.2566-2569
Main Authors: Li, Rongqiang, Guo, Yong-Xin, Zhang, Bing, Du, Guohong
Format: Article
Language:English
Subjects:
and Medical (ISM) band
Antenna measurements
Antenna radiation patterns
Bandwidths
Circular polarization
Circularly polarized (CP) antenna
Dipole antennas
Impedance matching
implantable antenna
Industrial
Microstrip antennas
Polarization
Scientific
Slot antennas
Specific absorption rate
specific absorption rate (SAR)
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Summary:A novel miniaturized circularly polarized (CP) annular-ring microstrip antenna with a smooth profile is presented for Industrial, Scientific, and Medical (ISM) band (2.4-2.48 GHz) implantable applications. The radiating element of the antenna consists of an annular ring and a central circular patch. The CP radiation is generated by adding a pair of open stubs in the inner boundary of the annular ring. The antenna profile is minimized by properly cutting two kinds of rectangular slots onto the annular ring. Furthermore, the Z-shaped slot on a central circular patch is implemented for improved axial ratio (AR) and better impedance matching. The volume of the proposed antenna including substrate and superstrate is 120.69 mm 3 , which is smaller than the other CP implantable antennas with similar performance. Simulated and measured -10-dB impedance bandwidth are 8.3% and 11.4%, respectively. The simulated 3-dB AR bandwidth is 2.49%. In addition, the radiation and specific absorption rate performance of the antenna are also characterized. It is a capable candidate for implantable applications.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2017.2734246