volume | PIER Journals

2018-07-14

First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader

Xiuhui Yang,

Dr. Xiuhui Yang

Institute of Microelectronics

Southwest Jiaotong University

China

Homepage

Quanyuan Feng,

Prof. Quanyuan Feng

School of Information Science and Technology

Southwest Jiaotong University

China

Homepage

Zongliang Zheng

Dr. Zongliang Zheng

School of Information Science and Technology

Southwest Jiaotong University

China

Homepage

Progress In Electromagnetics Research Letters, Vol. 77, 89-96, 2018

doi:10.2528/PIERL18052501

Abstract

A circularly polarized (CP) antenna with simple feeding network for ultra-high-frequency (UHF) radio-frequency identification (RFID) reader application is presented in this letter. The proposed antenna consists of a slot loop etched on the ground and a simple feeding network using bended microstrip lines. And the two parts of the antenna are printed on either sides of a thin substrate, thus a low-profile antenna is obtained. The slot loop is meandered based on the first-order Minkowski fractal technique for antenna size reduction. To generate circularly polarized radiation, two branches of the feeding network are designed to be orthorhombic with 90° phase difference. The antenna is simulated and practically fabricated with a compact size of 80×80×1.6 mm³. The 10-dB impedance bandwidth and 3-dB axial-ratio (AR) bandwidth are measured to be 50 MHz (0.896-0.946 GHz) and 12 MHz (0.916-0.928 GHz), respectively. The measured peak gain exhibits stable value of 3 dBi over the impedance bandwidth. Furthermore, a wide 3-dB beamwidth of 120° is achieved for the proposed antenna. Based on the above, this antenna is well suited for applications in UHF RFID handheld readers.

Citation

Copy Export

Xiuhui Yang, Quanyuan Feng, and Zongliang Zheng, "First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna with Simple Feeding Network for UHF RFID Reader," Progress In Electromagnetics Research Letters, Vol. 77, 89-96, 2018.
doi:10.2528/PIERL18052501

References

1. Hsu, H.-T. and T.-J. Huang, "A 1 × 2 dual-band antenna array for radio-frequency identification (RFID) handheld reader applications," IEEE Transactions on Antennas and Propagation, Vol. 62, 5260-5267, 2014.
doi:10.1109/TAP.2014.2340897

2. Raviteja, C., C. Varadhan, M. Kanagasabai, et al. "A fractal-based circularly polarized UHF RFID reader antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 499-502, 2014.
doi:10.1109/LAWP.2014.2308953

3. Nasimuddin, Z.-N. and C. X. Qing, "Asymmetric-circular shaped slotted microstrip antennas for circular polarization and RFID applications," IEEE Transactions on Antennas and Propagation, Vol. 58, 3821-3828, 2010.
doi:10.1109/TAP.2010.2078476

4. Lam, K.-Y., K.-M. Luk, K.-F. Lee, et al. "Small circularly polarized U-slot wideband patch antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 87-90, 2010.
doi:10.1109/LAWP.2011.2110631

5. Chen, Z.-N., X. Qing, and H.-L. Chung, "A universal UHF RFID reader antenna," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, 1275-1282, 2009.
doi:10.1109/TMTT.2009.2017290

6. Lin, Y.-F., H.-M. Chen, F.-H. Chu, et al. "Bidirectional radiated circularly polarised square-ring antenna for portable RFID reader," Electronics Letters, Vol. 44, 1383-1384, 2008.
doi:10.1049/el:20082579

7. Lai, X.-Z., Z.-M. Xie, Q.-Q. Xie, et al. "A dual circularly polarized RFID reader antenna with wideband isolation," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 1630-1633, 2013.
doi:10.1109/LAWP.2013.2294173

8. Hsu, H.-T. and T.-J. Huang, "Aperture-coupled dual-band circularly polarized antenna for RFID reader applications," 2012 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC), 52-55, 2012.
doi:10.1109/CSQRWC.2012.6294984

9. Chang, T.-N. and J.-M. Lin, "Serial aperture-coupled dual band circularly polarized antenna," IEEE Transactions on Antennas and Propagation, Vol. 59, 2419-2423, 2011.
doi:10.1109/TAP.2011.2144553

10. Dhar, S., R. Ghatak, B. Gupta, et al. "A wideband Minkowski fractal dielectric resonator antenna," IEEE Transactions on Antennas and Propagation, Vol. 61, 2895-2903, 2013.
doi:10.1109/TAP.2013.2251596

11. David, M.-P., Microwave Engineering, 3rd Ed., 315-317, Hamilton Printing, America, 2005.

12. Liu, Q., J.-Y. Shen, and H.-L. Liu, "Low-cost compact circularly polarized directional antenna for universal UHF RFID handheld reader applications," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 1326-1329, 2015.
doi:10.1109/LAWP.2015.2404033