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A small rectangular loop antenna (RLA) for RFID tags has been designed and fabricated for the UHF band. As the structure of a meander line and a folded meander line is applied in a general RLA, the RLA is miniaturised. The size reduction rate of meander line RLA and folded meander line RLA are 85.4 and 92.2% compared with a general RLA, respectively. The radiation patterns are omnidirectional in the z–y plane (horizontal pol.). Also the gain of the meander line RLA and folded meander line RLA are −2.47 and −4.01 dBd, respectively.
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Ryu et al. (2007) studied this question.
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