Battery-less wireless communication system through human body for in-vivo healthcare chip

Abstract

This paper proposes a battery-less wireless communication system for in-vivo healthcare chip. We measured attenuation characteristics through a human body equivalent for six frequencies. Measured attenuation of 13.56 MHz is 47 dB through 15 cm thickness of human body equivalent. It is too difficult to use the usual modulations under such low power consumption. Then, we implemented the proposed system using the 13-56 MHz band with pulse interval modulation (PIM). In the simulated result, 16 mV of output voltage can be obtained at the outside receiver when coupling factor is 0.1. We also investigate antenna structure, and a tablet structure is suitable for the proposed system.