Presenter: JYUN-NIAN LIN Adviser: Tsung-Fu Chien Date: 2014/3/19 1 Chen, Wen-Shan, and Yu-Che Huang. "A Novel CP Antenna for UHF RFID Handheld Reader." Antennas and Propagation Magazine, IEEE 55.4 (2013): A Novel CP Antenna for UHF RFID Handheld Reader

Outline  Introduction  Antenna Design  Results and Discussion  Conclusion  References 2

Introduction  RFID (Radio Frequency Identification)  Handheld readers  Circularly polarized (CP) 3

Antenna Design  Small size 4

Antenna Design  Circularly polarized 5

 HFSS  Return loss Results and Discussion 6

 Circularly polarized 7

Results and Discussion  Impedance match 8

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Results and Discussion 11

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Results and Discussion 13

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Conclusions  A novel circularly polarized antenna was designed for Japanese RFID readers.  Because of its compact size (60 mm × 60 mm × 0.8 mm), the proposed antenna is suitable for use in RFID handheld readers.  In addition, the optimized antenna operated in the desired performance band of 948 MHz to 954 MHz with an axial ratio of less than 3 dB, a return loss of more than 10 dB, and a 3 dB axial-ratio beamwidth larger than 80°, which meets the Japanese RFID system require ments. 15

References  1. J. Y. Sze, K. L. Wong, and C. C. Huang, “Coplanar Waveguide-Fed Square Slot Antenna for Broadband Circular Polarization Radiation,” IEEE Transactions on Antennas and Propagation, AP-51, 8, August, 2003, pp  2. K. L. Wong, C. C. Huang, and W. S. Chen, “Printed Ring Slot Antenna for Circular Polarization,” IEEE Transactions on Antennas and Propagation, AP-50, 1, January, 2002, pp  3. W. S. Chen, C. K. Wu, and K. L. Wong, “Single-Feed Square-Ring Microstrip Antenna with Truncated Corners for Compact Circular Polarization Operation,” Electronics Let ters, 34, 11, May, 1998, pp  4. K. P. Yang and K. L. Wong, “Dual-Band Circularly-Polar ized Square Microstrip Antenna,” IEEE Transactions on Antennas and Propagation, AP-49, 3, March, 2001, pp  5. C. F. Jou, J. W. Wei, and C. J. Wang, “Novel Broadband Monopole Antennas with Dual-Band Circular Polarization,” IEEE Transactions on Antennas and Propagation, AP-57, 4, April, 2009, pp

References  6. Y. Wang, Z. Shen, S. Aditya, and C. L. Law, “A MonopoleAntenna Fed by a Rectangular Waveguide,” IEEE Interna tional Symposium on Antennas and Propagation, July 3-8, 2005, pp  7. D. Z. Kim, H. S. Tae, K. S. Oh, M. Q. Lee, and J. W. Yu,“Helical Refl ector Antenna with a Wideband CP for RFID Reader,” IEEE Asia-Pacifi c Microwave Conference, Decem ber 7-10, 2009, pp  8. H. L. Chung, X. Qing, and Z. N. Chen, “Broadband Circularly Polarized Stacked Patch Antenna for UHF RFID Applications,” IEEE International Symposium on Antennas and Propagation, June 9-15, 2007, pp  9. H. W. Kwa, X. Qing, and Z. N. Chen, “Broadband Single-Fed Single-Patch Circularly Polarized Antenna for UHF RFID Applications,” IEEE International Symposium on Antennas and Propagation, pp. 1-4, July 5-11,  10. C. A. Balanis, Antenna Theory: Analysis and Design, Third 17

Thank You For Your Attention 18