Conclusions

Abstract

Due to its ease of deployment, wireless sensors have been used in a wide range of applications, including security, green building technology, automotive and health care. Most of the state-of-the-art wireless sensors use batteries as a power source. It can be easily calculated that for a building with 1000 wireless sensors installed, which can be very common for a smart building, assuming a battery life of 3 years, on average, batteries need to be replaced every day. Therefore, from both cost and convenience points of view, there is a strong demand for battery-less wireless sensors. To overcome the limitations of state-of-the-art battery-less wireless sensors in size, cost, robustness, and range, we proposed a 60 GHz wireless sensor system with monolithic sensors in this book. In the PREMISS system, the wireless sensors consist of wireless power receiving, sensing and communication functions in a single chip. The sensors have no external components and hence avoid costly IC-interfaces that are sensitive to mechanical and thermal stress.