Chipless RFID Reader Architecture

This chapter first presents an overview of chipless radio‐frequency identification (RFID) sensor reader architecture. It then describes the operation and functionality of two primary sections of the reader, namely RF section and digital control section. The reader architecture uses continuous‐wave sinusoidal signals for interrogation and is termed as frequency‐modulated continuous‐wave (FMCW) reader. The digital module controls the overall operation of the reader and can be compared with human brain. The reader operates in three main steps to decode a tag sensor. These are reader calibration, real‐time sensor data decoding, and tag ID decoding. To calibrate the reader across the bandwidth, two standard tags are used. One of the tags having all resonance dips (data ID 0) and another tag having no resonance dips (data ID 1). The reader determines necessary amplitude and phase threshold for each data bit.