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A broadband circularly polarized stacked probed-fed patch antenna has been proposed for ultra high-frequency Radio frequency identification applications

A Broadband Circularly Polarized Stacked Probe-Fed Patch Antenna For Uhf Rfid Applications

INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION, (2007): 1-9

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Abstract

A broadband circularly polarized stacked probe-fed antenna suitable for UHF RFID applications is presented and studied. The proposed antenna is fed by two probes which are connected to a hybrid coupler. Two parasitic patches are stacked above a primary probe-fed patch to enhance the bandwidth of the antenna. The optimized antenna prototyp...More

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Introduction
  • Radio frequency identification (RFID) technology has been rapidly developing in recent years and the applications have been found in many service industries, distribution logistics, manufacturing companies, and goods flow systems [1, 2].
  • The range and the scalability of RFID systems are strongly dependent on the operating radio frequency of the systems.
  • Due to the merits of high data transfer rate and long detection range, passive RFID systems at ultra high-frequency (UHF) band are preferred in many applications.
  • The frequency range for UHF RFID application is 902–928 MHz in North America (USA, Canada) and South America (Brazil, Argentina, etc.), and 865.5–867.6 MHz in Europe (Finland, Germany, France, Italy, Sweden, UK, etc.).
  • A reader antenna covering whole RFID UHF band is conducive to system configuration, system implementation, and cost reduction
Highlights
  • Radio frequency identification (RFID) technology has been rapidly developing in recent years and the applications have been found in many service industries, distribution logistics, manufacturing companies, and goods flow systems [1, 2]
  • This paper presents a broadband circularly polarized stacked probe-fed patch antenna for ultra high-frequency Radio frequency identification applications
  • A broadband circularly polarized stacked probed-fed patch antenna has been proposed for ultra high-frequency Radio frequency identification applications
  • The measurement has showed that the optimized antenna can cover the ultra high-frequency band of 820–980 MHz (17.7%) with gain of more than 6.5 dBic, axial ratio of less than 3.0 dB, and return loss of less than −15 dB
  • It is suitable for the ultra high-frequency Radio frequency identification reader antennas operating within the ultra high-frequency band of 840–960 MHz
Results
  • The challenges of the RFID reader antenna design lie in having a good impedance matching, low axial ratio, and high gain with the constraints of size and cost.
  • To achieve circularly polarized radiation, the patch antenna can be fed either with a single strip line, a coaxial line, or a power splitting network to excite two orthogonal patch modes in phase quadrature [3, 4].
  • In this proposed design, a hybrid coupler is used to form a feeding network for the circular polarization radiation.
Conclusion
  • A broadband circularly polarized stacked probed-fed patch antenna has been proposed for UHF RFID applications.
  • The measurement has showed that the optimized antenna can cover the UHF band of 820–980 MHz (17.7%) with gain of more than 6.5 dBic, axial ratio of less than 3.0 dB, and return loss of less than −15 dB
  • It is suitable for the UHF RFID reader antennas operating within the UHF band of 840–960 MHz. the parametric studies have addressed the effects of the height of the patches, the locations of the feeding probes, and the size of the ground plane on the performance of the antenna.
Reference
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  • F.-S. Chang, K.-L. Wong, and T.-W. Chiou, “Low-cost broadband circularly polarized patch antenna,” IEEE Transactions on Antennas and Propagation, vol. 51, no. 10, part 2, pp. 3006– 3009, 2003.
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