Inductive Coupling

Radio frequency identification (RFID) takes advantage of inductive links to not only power up the ultralow-power RFID tags, which cannot have batteries due to their size, weight, and lifetime limitations, but also read the tags, stored information through back telemetry. The main physical principle behind the operation of telemetry coils is Faraday's law, which states that when the total magnetic flux through a conductive loop. Power amplifiers are commonly utilized in wireless power transmission links to drive the primary coil by converting the DC power of an external source. Bidirectional wireless data transmission is essential for IMD and RFID systems to establish a short-range wireless communication between the Tx and Rx parts of the system. Inductive coupling as a viable technique to power up devices and also establish a wireless data communication link is widely used to remove direct electrical contact between the energy source and the target device.