Design of a Metasurface Inspired Circularly Polarized Dual-Band Compact Antenna for Biomedical Applications

In this communication, a compact metasurface-based circularly polarized antenna with inverted L-shaped slots engraved in the ground is proposed for biomedical applications. The prospective antenna operates in the two frequency bands covering Medical Device Radio Service (Med Radio) and Industrial, Scientific, and Medicine (ISM) bands with center frequencies of 2.45 GHz and 4.1 GHz, respectively. The impedance bandwidth of 14.4% and 42.5%, peak gain of 3.04 dB, and axial ratio (AR) bandwidth of 0.3 GHz and 1.1 GHz in the two frequency bands (2.31-2.67 GHz and 3.28-5.04 GHz) are obtained respectively on mounting antenna on a human body. For validating the prospective design, an antenna with the size of 0.264A0 x 0.264A0 x 0.014A0 was fabricated on a Rogers RT/Duroid 6002 substrate, and measurements were done in different scenarios. Link budget analysis of the device was also done for ensuring its communication ability.