Compact High-Gain Circularly Polarized Rx Antenna using G-Shape and Metamaterial-Loaded for Biomedical Implant Applications

This paper presents a high gain and compact circularly polarized implantable antenna that operates in the industrial, scientific, and medical (IMS) frequency band of 2.4 GHz. To do that, a meander line radiating patch that is assembled into a G-shape is proposed. Besides, a metasurface (MS) designed using genetic algorithm with the larger Epsilon value is employed to achieve higher performance and circular polarization property. As a result, the proposed CP antenna has a small overall size of 5.5 mm × 5.5 mm × 1.28 mm (38.72 mm
³
) with a broad impedance matching of 17 %, a peak gain of -20.6 dBi, and produces a wide axial ratio bandwidth (AR) of 14.1 %. The proposed antenna’s performances are tested via numerical simulations in a three-layer phantom model. Furthermore, the antenna provides low specific absorption rate (SAR) values that comply with IEEE safety guidelines.