A UHF RFID Reader/Writer Antenna

WANG Zhong-bao;FANG Shao-jun;FU Shi-qiang

ACTA ELECTRONICA SINICA ›› 2011, Vol. 39 ›› Issue (8) : 1873-1877.

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ACTA ELECTRONICA SINICA ›› 2011, Vol. 39 ›› Issue (8) : 1873-1877.
学术论文

A UHF RFID Reader/Writer Antenna

  • WANG Zhong-bao, FANG Shao-jun, FU Shi-qiang
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Abstract

A novel broadband circularly polarized stacked patch antenna is proposed for Chinese UHF radio frequency identification (RFID) reader/writer applications.The antenna is composed of two corner truncated patches and an S-shaped horizontally meandered strip (HMS),all of which are printed on the upper side of the FR4 substrates.One end of the S-shaped HMS is connected to the main radiating patch by a probe,while the other end is connected to an SMA connector.Using the proposed S-shaped HMS feed technique,a good impedance matching and symmetrical broadside radiation patterns can be achieved.Simulation results are compared with the measurements,and a good agreement is obtained.The measurements show that the antenna has an impedance bandwidth (VSWR<1.5) of about 26.6% (722-944MHz),a 3dB axial ratio (AR) bandwidth of about 10.8% (838-934MHz),and a gain level of about 8.5dBi or larger within the 3dB AR bandwidth.Therefore,the proposed antenna can be a good candidate for UHF RFID readers/writers operating between 840 and 928MHz.

Key words

broadband / circularly polarized / patch antenna / S-shaped horizontally meandered strip / RFID reader/writer

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WANG Zhong-bao;FANG Shao-jun;FU Shi-qiang. A UHF RFID Reader/Writer Antenna[J]. Acta Electronica Sinica, 2011, 39(8): 1873-1877.
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