Design of a UHF RFID metal tag for long reading range using a cavity structure

A novel UHF RFID metal tag antenna using a cavity structure for long reading range is proposed. The size of the proposed tag is 176.0 x 61.0 x 31.0 (mm3) and it can be applied for large metal materials and heavy equipments. The measured reading range is about 1 lm in free space and 15 m when attached to a metal plate. The reading range of the tag at attached to a metal is 4m better than that of the tag in free space.

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