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To evaluate the robustness of various RFID Tag antennas against close to metallic objects or liquid bottles, the concept of the antenna clearance, which shows the minimum distance from an obstacle with stable resonance, will be useful. We propose a new definition of the antenna clearance employing the variation of power reflection coefficient with the characteristic impedance of its feed line. A conducting...
This paper presented the definition for the antenna clearance using the ratio of input impedance variation caused by the disturbance conducting wire. The clearance was discussed for 2D plane in this paper. The 3D distributions are necessary to estimate an electrical volume of the antenna which is occupied for the stable antenna resonance. The antenna volume is a key index factor to compare different...
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