Novel miniature monopole tag antenna for UHF RFID applications

  • Liu H
  • Yang C
  • Ku C
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Abstract

A novel miniature monopole tag antenna for passive UHF radio frequency identification (RFID) operation is presented. The antenna possesses a two-sided structure that is printed on an FR4 substrate and fed by a 50-?? microstrip line. By properly using helical strips and vias, the antenna size can be reduced to a small volume of 10 (L) ?? 9.5 (W) ?? 0.8 (H) mm3 to be easily integrated within various portable devices. A miniaturized quasi-lumped circuit is also designed to achieve a good impedance matching between the antenna and the tag chip. Experimental results demonstrate that the antenna has a suitable operating band about 914-939 MHz and also nearly omnidirectional radiation patterns with proper gain. Moreover, the proposed compact tag antenna, capable of achieving a maximum readable range about 5.6 m with an effective isotropic radiated power (EIRP) equal to 4 W, is well suitable for RFID applications.

Author-supplied keywords

  • Effective isotropic radiated power (EIRP)
  • Monopole
  • Quasi-lumped circuit
  • Radio frequency identification (RFID)
  • Tag antenna

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Authors

  • Hsien Wen Liu

  • Chang Fa Yang

  • Chia Hao Ku

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