Efficient power transmission system using phase-conjugation of multiple inputs for 2D communication

The two-dimensional (2D) communication is a novel physical form of communication that utilizes the surface as a communication medium to provide both data and power transmission services. To efficiently transmit a relatively-large amount of electric power (several watts), we have developed a 2D communication system that concentrates the electric power on a specific spot by using phase control of multiple inputs. However, to find the optimal phases of the multiple inputs making the microwave converge on a specific spot in the 2D sheet, the prior knowledge of the device's position, and/or the pre-experiment measuring the output power, are needed. In wireless communication area, it is know that the retrodirective array scheme can efficiently transmit the power in a self-phasing manner, which uses the pilot signals sent by the devices. In this paper, we apply the retrodirective array scheme to the 2D communication system, and propose a power transmission scheme using the phase-conjugation of multiple inputs. To confirm the effectiveness of the proposal scheme, we evaluate its performance by computer simulation and realistic measurement. Both results show that the proposal scheme can achieve the retrodirectivity over the 2D communication system.