**2.2 Circularly polarized antenna**

Implantable antennas can communicate wirelessly with an external device. This is currently a great approach to stored physiological and real-time monitoring systems for biomedical telemetry [42]. Due to the effect of multipath distortion, communication with the help of far-field radio frequency (RF) link telemetry is sometimes affected. Since circularly polarized antenna preferred to the reduction of multipath and improvement of bit-error-rates can be achieved by circular

