Research On Microwave Power Transmission System For Micro Robot

With the rapid development of microelectronics and MEMS technology, micro mobile robots are considered to be of perspective in the fields of micro/nano manufacture, biomedical engineering, instrumentation, communication and military industry, etc. As dimension of a robot minimizes, short duration of battery life becomes a major barrier in field applications. Microwave power transmission (MPT), having the advantages such as unlimited supply duration, high energy conversion efficiency, high power density and compact structure, is the selected solution of this dissertation.By studying the models of both dipole antenna and Schottky Barrier Diode, a time domain model of the microwave rectifier has been developed. With the model, factors affecting the rectifying efficiency and output voltage have been estimated. Microstrip feed wires and reflection ground plane have been creatively and successfully integrated into the newly designed rectennas. A high voltage rectenna and a low voltage rectenna have been developed and fully tested.According to the requirements of both practical and experimental purposes, a microwave emitting system has been researched and developed. With phase lock loop, log amp and digital controlled attenuators, the emitting system can produce a microwave power around 10~20 Watts covering the full ISM band 2.40~2.50GHz with 500kHz step, and measures a high dynamic range of power at up to 87dB. Output power is guaranteed with high power amplifiers consisted of three stages.As a demonstration application, a microwave powered planar precision mobile robot based on Stick-slip driving principle is developed and tested. With the supply voltage excess 80V from the rectenna array, the robot can reach a moving resolutionμm grade. The stable working of microcontroller has also been realized. The performance of micro DC motors powered by microwave has also been tested and analyzed.