Design and implement the antena and power amplifier for 13.56 MHz rfid reader

Abstract

Radio Frequency Identification (RFID) technology has become more and more popular in daily life in various areas including access control, animal tracking, logistics, payment, asset identification and manufacturing industry. Working frequencies for RFID are reserved in several bands: highfrequency (HF) (13.56 MHz), ultra-high-frequency (UHF) (860–915 MHz), and microwave bands (2.4

GHz). 13.56 MHz RFID systems have been widely deployed for a number of years. Most of transceivers for 13.56 MHz RFID in the market provide a low output power, for example: 200mW for TRF7960 transceiver from Texas Instrument, 250mW for MLX90121 from Melexis, or 200mW for EM4094 from EM Microelectronics…This level of power is envisaged for a typical reading range of several centimeters. In general, the reading range relates to the size of the reader's antenna, its associated magnetic field strength and the tag's antenna size. In order to extend this reading range, some parameters of the reader, which are the output power and the antenna size, should be enhanced. In this project, I focus on designing an antenna and a power amplifier in order to extend the reading range of a RFID reader. There are several kinds of power amplifiers that can be used for RFID, such as Class A, AB, C, D, and E amplifiers. Among them, Class-E is the best candidate in term of circuit simplicity, high frequency performance and suitability in driving a large inductive load such as a loop antenna. The purpose of this project is to design a Class-E power amplifier working at 13.56 MHz for integrating with the

TRF7960 transceiver from Texas Instrument. A full circuit of RFID reader and an antenna with large size will be implemented to validate the design.