Impedence characterization of RFID tag antennas and application in conformal tag antenna

In the present work a method is proposed which enables accurate and effective reliability tests of impedance measurement of tag antenna directly by extracting S parameters from the double coaxial test device. The experimental and simulated impedance of tag antenna are presented in this paper, under the condition of UHF Passive tag and long-distance RFID system and the working frequency of the antenna is about 800MHz-IOOOMHz . Applied the established impedance simulated model to an anti-metal folded dipole tag antenna model the input impedance can be achieved which can verify the correctness of the impedance measurement model. Then an innovative application is applied to the anti-mental conformal tag antenna. The proposed method is available to it, for the impedance characteristics has been accurately characterized.