Towards an intelligent EM barcode

In this paper, a detail literature review on the research development of `wireless chipless RFID sensor platform´ has been presented. The review aims to highlight the future trend of chipless RFID technology and the realization of an intelligent Electromagnetic (EM) barcode by integrating sensing mechanism to this platform. Here, a chipless RFID sensor comprising of multiresonator spirals coupled with a microstrip line is proposed. Each spiral represents a single data bit and the number of cascaded spirals corresponds to the number of bits it can store. The integration of sensing is performed by utilizing the resonant frequency of a specific spiral of the tag. Unlike earlier reported works on chipless RFID sensor our proposed sensor does not require any external circuitry for sensing environment physical parameter such as temperature, gas, humidity etc. The most significant feature is the ability to combine multiple physical parameters sensing paradigm in the same chipless RFID platform for ubiquitous environment condition monitoring.