Frequency-division techniques for microwave power transfer and wireless communication system with closed waveguide

Microwave power transfer is expected to support various applications. However, there are strict regulations for radio emissions and leakage levels. We attempt to avoid the regulation and transmission loss in free space by employing a waveguide method for microwave power transfer. We experimentally investigated the frequency-division multiple access techniques as a method of microwave power and communication transmission. Results indicated that the communication quality did not deteriorate for a carrier frequency distance of 7-8 MHz between the microwave power carrier and each modulated signal. The experimental prototype of the microwave power transfer system comprising a batteryless and powerless ZigBee communication unit confirmed continuous operation and use of the waveguide wireless system.