Study on 13.56‐MHz out‐to‐in body channel and its coexistence with human body communication for capsule endoscope

Abstract

AbstractA capsule endoscope transmits images of the digestive organs from the inside to the outside of the body. For in‐to‐out body transmission, a capsule endoscope can use human body communication (HBC) instead of radio frequency (RF). However, an HBC endoscope does not transmit in the opposite direction (i.e., out‐to‐in body transmission). In this study, out‐to‐in body transmission using HBC at 13.56 MHz was investigated, and the results are presented herein. The coexistence between the 13.56‐MHz out‐to‐in body transmission and HBC was investigated through channel measurement and bit error rate (BER) analysis. The use of 13.56 MHz is advantageous because out‐to‐in body transmission can be easily implemented using various existing chip solutions that have been developed for 13.56‐MHz radio‐frequency identification (RFID).