RFID reader front-end having robust Tx leakage canceller for load variation

Won Gyu Lim, Seo Young Park, Wang Ik Son, Moon Que Lee, Jong Won Yu

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A novel front-end structure for ultra-high-frequency RF identification reader is proposed. The proposed front-end consists of a balanced coupler and four-port feed antenna system. The proposed balanced coupler structure has high transmit/receiver isolation feature and good insensitivity to load variations. The proposed four-port feed antenna system is applied for removing the coupling among antennas, which deteriorates the isolation. The proposed system is numerically analyzed and verified experimentally as well.

Original languageEnglish
Article number4811950
Pages (from-to)1348-1355
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
StatePublished - May 2009


  • Antenna isolation
  • Directional coupler
  • Load impedance variation
  • Ultra-high-frequency (UHF) RF identification (RFID)


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