Low‐sidelobe circular‐polarized microstrip array for 2.45 GHz RFID readers

Sun, Zhenrong; Zhong, Shun‐Shi; Tang, Xiao-rong; Chen, Kuang-da

doi:10.1002/mop.23637

Cited by 10 publications

(1 citation statement)

References 4 publications

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“…CP for the reader antennas in transmission is preferred because the tag antenna (which is linearly polarized) will receive enough power from the transmitter irrespective of its orientation. A CP antenna with a low profile, small size, lightweight, high gain, and high front-to-back ratio is required in a portable RFID reader [5][6][7]. Recently, fixed-reader antennas are becoming more complex microstrip patch arrays with high gain, and a relatively narrow beam and low side lobe level [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

8×8 Near-Field Focused Circularly Polarized Cylindrical DRA Array for RFID Applications

Zainud-Deen¹,

Malhat²,

Awadalla³

2012

EEE

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The design of 8×8 near-field focused circularly polarized dielectric resonator antenna (DRA) array for fixed RFID reader applications at 5.8GHz is presented. The proposed antenna array consists of 64-element of circular dielectric resonator antennas (CDRA) with two orthogonal feeding probes located inside the CDRA element. A single element CDRA with supporting arms used as a building block of the array provide good impedance matching and circular polarization at 5.8GHz. The perforation technique is used for the supporting arms to reduce the manufacturing complexities in the DRA mounting over the ground plane. The sequential feeding technique is used to improve the gain and circular polarization bandwidth of the single element and the array. The characteristics of the near-field focused array are introduced compared to that of uniformly phased array. The finite integral technique and the finite element method are used to compute the array performance

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Section: Introductionmentioning

confidence: 99%

8×8 Near-Field Focused Circularly Polarized Cylindrical DRA Array for RFID Applications

Zainud-Deen¹,

Malhat²,

Awadalla³

2012

EEE

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Design of a novel dual ports antenna to enhance sensitivity of handheld RFID reader

Wang

Zhang

et al. 2015

Int. J. Microw. Wireless Technol.

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A compact dual ports antenna with high isolation is proposed for handheld radio frequency identification (RFID) reader which is rarely reported in open literatures. Different with conventional handheld RFID reader antennas with single port, the proposed antenna transmits and receives signal separately. The proposed antenna operating with full duplex mode can enhance effectively sensitivity of reader, since the strong transmitting signal of reader with single port is usually highly coupled with weak receiving backscatter signal of tag. The antenna utilizes E-shaped aperture-coupled patch structure that occupies less volume and provides further space-saving efficiency. The height of the proposed antenna is only 6.8 mm and the volume of that is 80 mm × 80 mm × 6.8 mm, which is easy to integrate in handheld RFID readers. The antenna uses two E-shaped coupling apertures to excite two orthogonal modes for dual-polarized operation. High isolation of around −30 dB is obtained by proper arrangement of the length of coupling apertures and the position of the stubs. The measured results show −10 dB matching band and −25 dB isolation band from 2.32 to 2.6 GHz and from 2.3 to 2.55 GHz, respectively. The antenna is suitable for applications in handheld RFID readers.

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