Coupling circuitary for impedance adaptation in power line communications using VCGIC

The access impedance of the power line channel is time variant. This feature of the power line channel is the main cause of impedance mismatching between the access impedance of the power line channel and the output impedance of the power line communication system and impedance mismatching lead to the problem of reducing the communication range. Therefore, it is very important to match between the access impedance of the power line channel and the output impedance of the power line communication system for the expansion of the communication range. The impedance matching can be achieved to change the output impedance of the line coupling circuitary. In this paper, the voltage controllable inductance circuit, which is composed of resistors, capacitors and OP-AMPs, is applied to the proposed line coupling circuitary. The proposed line coupling circuitary is smaller and more flexible than other existing line coupling circuitary for the adaptation to channel. Though, the proposed line coupling circuitary has the limited operation range, the maximum power transmission is achieved in the limited range. The proposed line coupling circuitary is simulated and measured to confirm its performances.