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To obtain the antenna impedance of antennas designed for UHF RFID applications by means of measurements, vector network analyzers are commonly applied. Such measurement devices are unbalanced by nature. In the present paper the influence of the needed test fixture and interconnection structures on the antenna impedance is investigated in terms of numerical field simulations.
Dipole antennas in UHF RFID tags are driven by differential signals; it is difficult to measure the antenna input impedance accurately using single-ended probes. Furthermore, the testing fixture used in the antenna measurement process also induces additional parasitic effects; accurate measurement cannot be achieved without taking the fixture impact into consideration. In this paper, we propose to...
In this paper, an impedance measurement method for UHF band RFID near field reader antenna (NFRA) by using coaxial line is proposed. The coaxial line is directly connected to the balanced output port of the NFRA, and then the S parameter is obtained including NFRA and the coaxial line. The impedance can be derived by using deembedding technique which removes the effect of cascading coaxial line. Therefore,...
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