Selective proximity power transmission using low leakage ribbon waveguide and high-Q resonant coupler

In this paper we propose a one-dimensional (1-D) proximity power transmission system. The system can transfer the microwave power to the receiver device at an arbitrary position on a 1-D ribbon waveguide without electrical contacts. The power is selectively transferred only to special receivers and not to other objects. Such selectivity is needed for transferring higher-wattage power safely in a general environment. The selectivity is realized by using a low-leakage ribbon waveguide and a high-quality-factor (high-Q) resonant receiver coupler. We also propose a scheme to reduce the receiver position dependency of power transmission by attaching a reflection phase shifter at the end of the waveguide. A fabricated prototype system achieved 16% power transmission in the microwave form.