Miniaturized implantable circularly polarized patch antenna

A single-fed miniaturized circularly polarized (CP) microstrip patch antenna is designed and experimentally demonstrated for biomedical applications. The proposed antenna is designed utilizing the capacitive loading on the radiator. Compared with a square patch antenna, the proposed antenna has achieved a significant size-reduction of ~72%. The footprint of proposed antenna is 10×10×1.27 mm³. The simulated impedance, axial ratio (AR) and radiation pattern are studied and compared in different phantom model and a Gustav voxel human body. The effect of different body phantoms is discussed to evaluate the sensitivity of the proposed antenna. The simulated and measured impedance bandwidths in one-layer skin phantom are 7.7% and 10.2%, respectively.