Compact metallic RFID tag antennas with a loop-fed method

Peng H. Yang, Yan Li, Lijun Jiang, W. C. Chew, Terry Tao Ye

Research output: Contribution to journalArticlepeer-review


Several compact, low profile and metal-attachable RFID tag antennas with a loop-fed method are proposed for UHF RFID systems. The structure of the proposed antennas comprise of two parts: (1) The radiator part consists of two shorted patches, which can be treated as two quarter-wave patch antennas or a cavity. (2) A small loop printed on the paper serves as the feeding structure. The small loop provides the needed inductance for the tag and is connected to the RFID chip. The input impedance of the antenna can be easily adjusted by changing loop dimensions. The antenna has the compact size of 80 mm × 25 mm × 3.5 mm, and the realized gain about -3.6 dB. The measured results show that these antennas have good performance when attached onto metallic surfaces.

Original languageEnglish (US)
Article number5991909
Pages (from-to)4454-4462
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Issue number12
StatePublished - Dec 2011
Externally publishedYes


  • Compact antenna
  • RFID tag antenna
  • feeding network
  • low profile
  • metallic surface

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


Dive into the research topics of 'Compact metallic RFID tag antennas with a loop-fed method'. Together they form a unique fingerprint.

Cite this