*3.1.4 High frequency*

As we know, a higher operating frequency will result in a shorter wavelength. Hence, an antenna that can be designed at a higher frequency will result in, small volume. In literature implantable antennas works in frequency bands like MedRadio 401–406 MHz [32, 72], MICS (Medical implants communication Service) 402– 405 MHz [7, 27, 29–31, 33, 35, 36, 54, 65, 70, 71, 73–80] and ISM (Industrial, Scientific and Medical) 2400–2480 MHz [32, 33]. In literature, it's reported that the MICS band is more preferably used for the design of the implantable antenna. In [56] an implantable antenna and capsule antenna were designed at wireless telemetry services (WMTS) band 1395–1400 MHz for performance evaluation and it is used for remote monitoring of patient's health.
