Impedance measurement of dipole antenna for EPC Global compliant RFID tag

Abstract

This paper presents the design, measurement methodology and results of a dipole antenna for a RFID tag compliant to EPC Global Gen2. The impedance of the proposed antenna is match at 915 MHz. The meander-line tag antenna dimensions were optimized and evaluated using the software CST Microwave Studio. S parameters of the fabricated antenna were measured using a two-port VNA. The impedance was computed and comparisons with the simulated values were done. It was observed that erroneous material specifications can cause a significant variation in the impedance results.