volume | PIER Journals

Abstract

This paper proposes a newly designed compact coplanar-waveguide-fed wideband circularly polarized (CP) printed square slot antenna (PSSA), in the square slot of which are a halberd-shaped feeding signal line and a square ring patch. By placing a specially designed metal reflector behind the bidirectional CP PSSA, one can obtain unidirectional CP patterns with a associated 3-dB axial-ratio bandwidth (ARBW) almost the same as that of the bidirectional antenna. The bidirectional L- and S-band PSSAs designed on FR4 substrates have 3-dB ARBWs as large as 25.3% and 29.1%, respectively. For the L-band antennas, the unidirectional design yields a 3-dB ARBW of 25.7% and a gain of about 3 dB higher than that of the bidirectional counterpart. In all these 3-dB axial-ratio bands, impedance matching with VSWR ≤ 2 is also achieved. Most importantly, the design concepts, procedures, and rules for the proposed antenna are presented in detail.

1. Samper, J. M., R. B. Pérez, and J. M. Lagunilla, GPS & Galileo: Dual RF Front-end Receiver And Design, Fabrication, and Test, McGraw-Hill, 2009.

2. Johnson, R. C. and H. Jasik, Antenna Engineering Handbook, McGraw-Hill, 1984.

3. Yang, S. S., K.-F. Lee, A. A. Kishk, and K.-M. Luk, "Design and study of wideband single feed circularly polarized microstrip antennas," Progress In Electromagnetics Research, Vol. 80, 45-61, 2008.
doi:10.2528/PIER07110604

4. Lai, C.-H., T.-R. Chen, and T.-Y. Han, "Circularly-polarized reconfigurable microstrip antenna," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 2--3, 195-201, 2009.
doi:10.1163/156939309787604373

5. Kasabegoudar, V. G. and K. J. Vinoy, "A broadband suspended microstrip antenna for circular polarization," Progress In Electromagnetics Research, Vol. 90, 353-368, 2009.
doi:10.2528/PIER09012901

6. Lin, C., F.-S. Zhang, Y. Zhu, and F. Zhang, "A novel three-fed microstrip antenna for circular polarization application," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 11--12, 1511-1520, 2010.
doi:10.1163/156939310792149731

7. Chen, X., G. Fu, S.-X. Gong, Y.-L. Yan, and J. Chen, "Parametric studies on the circularly polarized stacked annular-ring microstrip antenna," Progress In Electromagnetics Research C, Vol. 12, 65-77, 2010.
doi:10.2528/PIERC09121505

8. Tsai, C.-L., S.-M. Deng, C.-K. Yeh, and S.-S. Bor, "A novel shorted rectangular-loop antenna for circularly polarized wave operations," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 10, 1323-1334, 2009.
doi:10.1163/156939309789108633

9. Bai, X., X.-M. Zhang, L. Li, Q. Yang, and J. Li, "Double-sided printed four rhombic-loop antenna with parasitic loops for circular polarization," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 13, 1795-1802, 2009.
doi:10.1163/156939309789566860

10. Sze, J. Y., C.-I. G. Hsu, M. H. Ho, Y. H. Ou, and M. T. Wu, "Design of circularly polarized annular-ring slot antennas fed by a double-bent microstripline," IEEE Trans. Antennas Propagat., Vol. 55, No. 11, 3134-3139, Nov. 2007.
doi:10.1109/TAP.2007.908801

11. Kumar, C. K. and S. N. Sinha, "A patch-loaded ring-slot antenna for wide band circular polarization," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 17--18, 2409-2419, 2009.

12. Deng, S.-M., C.-L. Tsai, M.-F Chang, and S.-S. Bor, "A study on the non-uniform rectangular-ring slot antenna for broadband circular polarization operations," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 4, 543-555, 2010.

13. Tseng, L. Y. and T. Y. Han, "Microstrip-fed circular slot antenna for circular polarization," Microwave Opt. Technol. Lett., Vol. 50, No. 4, 1056-1058, Apr. 2008.
doi:10.1002/mop.23290

14. Han, T. Y., Y. Y. Chu, L. Y. Tseng, and J. S. Row, "Unidirectional circularly-polarized slot antennas with broadband operation," IEEE Trans. Antennas Proporgat., Vol. 56, 1777-1780, Jun. 2008.
doi:10.1109/TAP.2008.923380

15. Row, J. S. and S. W. Wu, "Circularly-polarized wide slot antenna loaded with a parasitic patch," IEEE Trans. Antennas Propagat., Vol. 56, 2826-2832, Sep. 2008.
doi:10.1109/TAP.2008.928769

16. Joseph, R., S. Nakao, and T. Fukusako, "Circular slot antennas using L-shaped probe for broadband circular polarization," Progress In Electromagnetics Research C, Vol. 18, 153-168, 2011.

17. Joseph, R. and T. Fukusako, "Bandwidth enhancement of circularly polarized square slot antenna," Progress In Electromagnetics Research B, Vol. 29, 233-250, 2011.

18. Sze, J. Y., J. C. Wang, and C. C. Chang, "Axial-ratio bandwidth enhancement of asymmetric-CPW-fed circularly-polarised square slot antenna," IEE Elect. Lett., Vol. 44, No. 18, 1048-1049, Aug. 2008.
doi:10.1049/el:20081858

19. Sze, J. Y. and C. C. Chang, "Circularly polarized square slot antenna with a pair of inverted-L grounded strips," IEEE Antenna and Wireless Propagat. Lett., Vol. 7, 149-151, 2008.
doi:10.1109/LAWP.2008.921341

20. Chu, Q. X. and S. Du, "A CPW-fed broadband circularly polarized square slot antenna," Microwave Opt. Technol. Lett., Vol. 52, 409-412, Feb. 2010.
doi:10.1002/mop.24904

21. Sze, J. Y., C. I. G. Hsu, Z. W. Chen, and C. C. Chang, "Broadband CPW-fed circularly polarized square slot antenna with lightening-shaped feedline and inverted-L grounded strips," IEEE Trans. Antennas Propagat., Vol. 58, 973-977, Mar. 2010.
doi:10.1109/TAP.2009.2039335

22. Liao, W. and Q.-X. Chu, "CPW-fed square slot antenna with lightening-shaped feedline for broadband circularly polarized radiation," Progress In Electromagnetics Research Letters, Vol. 18, 61-69, 2010.
doi:10.2528/PIERL10080101

Prof. Jia-Yi Sze

Mr. Shien-Piao Pan