Research on Impedance Matching for Improving Gain in Conductive Intracardiac Communication

As an emerging method of intracardiac wireless communication, conductive intracardiac communication (CIC) has the advantages of low power consumption and high security of information transmission, and is suitable for synchronization between multiple leadless pacemakers (LCPs). However, the complicated intracardiac environment increases the measurement uncertainty of intracardiac channel parameters, and current research on intracardiac communication does not take into account impedance mismatch. These may lead to unreliable communication between LCPs. In this paper, an equivalent circuit model of the intracardiac channel is constructed based on the electrical characteristics of cardiac tissue. The intracardiac channel uses an L-type impedance matching circuit to improve the channel gain. The results show that the channel gain increases by more than 7 dB after adding the impedance matching circuit. Especially, the most significant increase is 8.33 dB at 10MHz. This proves the feasibility of the impedance matching method and provides an effective solution for the future design of intracardiac communication transceivers.