RFID Tag Capable of Efficient Free-Space and Near-Metal Operation
نویسندگان
چکیده
The great majority of commercial UHF RFID tags are based on dipole antennas, and it is well-known that the tag performance degrades significantly when placed near a conducting surface. The question we address in this paper is: is it necessarily so? In this paper, we present evidence that suggest that it is not, at least to the degree that it has been observed. We present two antennas: one that performs optimally in free-space and performs 15 dB better near metal than a comparable peer. The second antenna is nearly optimal near metal, but operates efficiently over a narrow frequency, and is “good” in free space. We present detailed simulated and measured results for these two tags.
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