ETRI Journal

  • 제30권4호
  • /
  • Pages.597-599
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  • 2008
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  • 1225-6463(pISSN)
  • /
  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
권호 표지

RFID Tag Antenna Coupled by Shorted Microstrip Line for Metallic Surfaces

  • Choi, Won-Kyu (IT Convergence Technology Research Laboratory, ETRI) ;
  • Kim, Jeong-Seok (IT Convergence Technology Research Laboratory, ETRI) ;
  • Bae, Ji-Hoon (IT Convergence Technology Research Laboratory, ETRI) ;
  • Choi, Gil-Young (IT Convergence Technology Research Laboratory, ETRI) ;
  • Pyo, Cheol-Sig (IT Convergence Technology Research Laboratory, ETRI) ;
  • Chae, Jong-Suk (IT Convergence Technology Research Laboratory, ETRI)
  • 투고 : 2008.02.25
  • 심사 : 2008.04.21
  • 발행 : 2008.08.30
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초록

This letter presents the design of a small and low-profile RFID tag antenna in the UHF band that can be mounted on metallic objects. The designed tag antenna, which uses a ceramic material as a substrate, consists of a radiating patch and a microstrip line with two shorting pins for a proximity-coupled feeding structure. Using this structure, impedance matching can be simply obtained between the antenna and tag chip without a matching network. The fractional impedance bandwidth for $S_{11}$ <3 dB and radiation efficiency are about 1.4% and 56% at 911 MHz, respectively. The read range is approximately from 5 m to 6 m when the tag antenna is mounted on a metallic surface.

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