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It is well-known that UHF RFID tag performance degrades when placed near metal. While the mechanisms for how dipole performance degrades near metal is known, it is generally not known how the parameters of the T-match change in the presence of metal, and what, if anything, can be done to improve near-metal performance. In this paper, we develop a set of expressions that describe the affect of antenna...
A small broadband patch antenna for RFID tags is proposed in this paper. Using inset-feed technique together with two asymmetrical slots embedded from two non-radiation edges deep into the center of the square patch, two resonances with similar radiation characteristics can be excited. It thus increases the bandwidth of the antenna. The two slots can also reduce the size of the patch, and the inset...
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