Module integrated antenna with circular polarization for mobile UHF RFID reader

Wang Ik Son, Moon Que Lee, Jong Won Yu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A module integrated antenna with circular polarization for a mobile UHF radio frequency identification reader is presented. In the proposed design, a reader module using a hybrid assemble technique is directly integrated inside the antenna. In order to compensate the degraded radiation efficiency of the reader antenna due to the module integration, a quadruple inverted-f antenna (QIFA), a type of four-port antenna like QIFA, is used. For the compact four-port antenna, we analyze the optimum matching method considering both the reflection coefficient at each port and the mutual coupling among ports simultaneously to improve the performance of the proposed module integrated antenna. Experimental results show that the proposed module integrated antenna of size 80 × 80 × 11.2 mm3 with the shielded module is well matched, and has the peak gain of 3.3 dBic and the axial ratio under 2.5 dB.

Original languageEnglish
Article number5728890
Pages (from-to)1157-1165
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number4 PART 2
StatePublished - Apr 2011


  • Circular polarization
  • RF identification (RFID) reader antenna
  • four-port antenna matching method
  • module integrated antenna
  • quadrifilar antenna
  • quadruple inverted-f antenna (QIFA)


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