Analysis and Synthesis of Passive UHF RFID using Embedded T-Match

Abstract

Radio frequency identification technology with its ability to being read at long ranges and have reliable performance, is at the pinnacle of technological advancement. With the number of applications for RFID increasing, designing RFID tag antennas effectively to work efficiently for the particular application is critical. Antenna characteristics if known, significantly help in antenna design. T-match structure is commonly used to design RFID tags as the structure helps in matching an RFID chips reactive impedance to a dipole. Models that describe T-match are known, but they are neither sufficiently accurate to model antennas nor to synthesize the antenna geometry. Here, we present a simple matching network known as embedded T-match. The characteristics of this antenna are studied and a model accurately analyzing the antenna is also presented. A synthesis process is also presented to effectively synthesize the antenna geometry for the given design constraint.