CPW-Fed Wideband Circular Polarized Antenna for UHF RFID Applications

We propose a wide bandwidth antenna with a circular polarization for universal Ultra High Frequency (UHF) radio-frequency identification (RFID) reader applications. To achieve a wide 3 dB axial ratio (AR) bandwidth, three T-shaped microstrip lines are inserted into the ground plane. The measured imp...

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Veröffentlicht in:	International journal of antennas and propagation 2017-01, Vol.2017 (2017), p.1-7
Hauptverfasser:	Kim, Sun-Woong, Choi, Dong-You, Kim, Guen-Sik
Format:	Artikel
Sprache:	eng
Schlagworte:	Antenna gain Antenna radiation patterns Antennas Bandwidths Broadband Circular polarization Circularity Engineering Fractals Ground plane Impedance Microstrip transmission lines Propagation Radio frequency identification T shape Ultrawideband Very high frequencies
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Beschreibung
Zusammenfassung:	We propose a wide bandwidth antenna with a circular polarization for universal Ultra High Frequency (UHF) radio-frequency identification (RFID) reader applications. To achieve a wide 3 dB axial ratio (AR) bandwidth, three T-shaped microstrip lines are inserted into the ground plane. The measured impedance bandwidth of the proposed antenna is 480 MHz and extends from 660 to 1080 MHz, and the 3 dB AR bandwidth is 350 MHz and extends from 800 to 1155 MHz. The radiation pattern is a bidirectional pattern with a maximum antenna gain of 3.67 dBi. The overall size of the proposed antenna is 114 × 114 × 0.8 mm3.
ISSN:	1687-5869 1687-5877
DOI:	10.1155/2017/3987263