Presenter: JYUN-NIAN LINAdviser: Tsung-Fu ChienDate: 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): 128-137.

A Novel CP Antenna forUHF 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

Results and Discussion Circularly polarized

7

Results and Discussion  Impedance match

8

9

10

Results and Discussion

11

12

Results and Discussion

13

14

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. 2141-2144.

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. 75-77.

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. 1045-1047.

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. 377-382.

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. 1027-1034.

16

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.728-731.

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. 1032-1035.

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. 1189-1192.

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, 2008.

10. C. A. Balanis, Antenna Theory: Analysis and Design, Third

17

Thank You For Your Attention

18