Summary
International Symposium on Antennas and Propagation
2008
Session Number:3C24
Session:
Number:3C24-3
Gain and Input Impedance Measurement for UHF Transponder Antennas
Lukas W. Mayer, Arpad L. Scholtz,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
It was shown by numerous authors that the characterization of RFID (radio-frequency identification) transponder antennas that are favored to be small, have low gain, and show a strongly reactive input impedance, is far from trivial. We propose a method that utilizes a small, highly-stable, battery-driven signal source to generate the transmit signal directly at the antenna. The signal source is equipped with a tunable matching network that allows to determine the antenna impedance by a source-pull measurement. Antenna gain can be measured by using the battery-powered oscillator as a calibrated transmitter