Development of Battery-less Sensor for Maintenance of Infrastructures with Microwave Power Transfer

Maintenance of infrastructures, e.g. road, tunnel, bridge, etc., is one of most important issues that must be solved for sustainable society. It is usually measured and checked by human, however, it is very hard to measure a lot of infrastructures. Recently, new sensors to measure the infrastructures are developed and it is easy and convenient for the maintenance of the infrastructures. It is requested to expand a life time of the sensors. So battery-less sensor is hopeful expected because life time is decided by battery time.