抄録
Power supply is one of the key challenges for perpetual operation of electrical devices in Internet of Things (IoT) era. Low power electrical devices used at home are usually powered by coin cell batteries. However, the battery charging for such devices result in significant increases in operation cost. In this paper, we discuss feasibility of harvesting and storing a small amount of energy from ambient electromagnetic waves. A combination of an antenna and rectifier can be used to collect a few hundreds of microwatts of energy from several energy sources such as TV towers and microwave ovens. By accumulating this energy over time by a capacitor, it is possible to provide power to low-power devices and realize perpetual operation of such devices.
