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http://dx.doi.org/10.5515/KJKIEES.2007.18.3.315

Compact Active Integrated Antenna with Rectagular Ring Structure for UHF RFID Reader  

Yun, Gi-Ho (Department of Mobile Radio Communication Engineering, Honam University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.3, 2007 , pp. 315-322 More about this Journal
Abstract
In this paper, active integrated antenna with left hand circular polarization(LHCP) for a transmitter of UHF RFID reader has been described. A novel rectangular ring patch as a radiator of the active antenna is proposed for easier impedance matching, smaller patch size, and LHCP characteristics. An amplification circuit is placed in the opening area of the radiator and is combined with it to work as oscillating circuit around 915 MHz. From the test results, impedance bandwidth of 29 MHz, 3 dB axial ratio bandwidth of 20 MHz, 3 dB beamwidth of 85 degree, and effective radiation power of 8.8 dBm have been obtained.
Keywords
Active Integrated Antenna; UHF RFID Reader; Ring Patch; Circular Polarization;
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