Beam focused slot antenna for microchip implants

This paper proposes a beam focused transmitter implemented by four curved slot antennas and a 4-port feed network that synthesizes the optimal current distribution. We first examine the dominant current found for a receiver modeled as a magnetic dipole (i.e. small coil) and obtain a simplified current distribution. The simplified distribution is realized by a pair of slot antennas which is used to design an array that is robust to the horizontal orientation of the receiver coil.