Title :
Measurement of UHF RFID tag antenna impedance
Author :
Qing, Xianming ; Goh, Chean Khan ; Chen, Zhi Ning
Author_Institution :
Inst. for Infocomm Res., Singapore
Abstract :
A methodology to measure UHF RFID tag antenna impedance using network approach is presented. The balanced UHF RFID tag antenna is considered as a two-port network and the impedance of the antenna is characterized by network parameters. In the measurement, the balanced antenna is connected to the two ports of a two-port vector network analyzer (VNA) through a test fixture. The influence of the test fixture is de-embedded by using a portextension technique and then the antenna impedance is extracted directly from the measured S-parameters. The proposed method is validated by comparing the measured and the simulated impedance of an asymmetrical dipole antenna and a symmetrical meander line dipole antenna both for UHF RFID tags.
Keywords :
S-parameters; UHF antennas; dipole antennas; electric impedance measurement; network analysers; radiofrequency identification; two-port networks; UHF RFID tag antenna; asymmetrical dipole antenna; iS-parameters; impedance measurement; network parameters; port- extension technique; symmetrical meander line dipole antenna; test fixture; two-port vector network analyzer; Antenna measurements; Circuit testing; Dipole antennas; Fixtures; Impedance measurement; Instruments; RFID tags; Scattering parameters; UHF antennas; UHF measurements;
Conference_Titel :
Antenna Technology, 2009. iWAT 2009. IEEE International Workshop on
Conference_Location :
Santa Monica, CA
Print_ISBN :
978-1-4244-4395-6
Electronic_ISBN :
978-1-4244-4396-3
DOI :
10.1109/IWAT.2009.4906968
