Towards an LC passive wireless sensor platform

Inductor-capacitor (LC) passive wireless sensors use a transformer with loose coupling between an external readout coil and an inductor that receives power through this inductive coupling. This paper presents the overview and development of the LC sensors. The configuration and operation principle are first introduced simply. Then the advantages of the LC sensors are illustrated to manifest the importance of further studies. Through decades of study, the LC sensors still face two problems: increasing the readout distance and expanding into multifunction platform. Around these two questions, recent efforts by our group are introduced and analyzed in detail. The development prospect of the LC sensors is finally outlined.