A novel coplanar waveguide (CPW) fed wide slot antenna for broadband circular polarization (CP) operation is proposed in this letter. Utilizing an asymmetrical ground plane and an open slot, broadband axial ratio and good impedance characteristics can be obtained in the middle and low bands. The perturbation patch on the right side of the wide slot excites the upper-band CP mode. By adjusting the upper-part feedline and the wide slot structure, the axial ratio performance can be optimized to a wideband axial ratio bandwidth (ARBW). Compared with wide slot antennas of similar size, the proposed antenna has a simpler structure while achieving a wider ARBW. The proposed antenna has been fabricated and tested. The measured results show that the -10 dB impedance bandwidth (ZBW) is 2.40-7.55 GHz (103.5%); 3-dB ARBW is 2.47-6.2 GHz (86.0%); and the peak gain is about 4 dBic. Right-hand circular polarization (RHCP) radiation pattern is achieved in +z direction. The proposed antenna can be used in WLAN/WiMAX applications and various wireless communication systems which require broadband ZBW and ARBW.
2. Ghobadi, A. and M. Dehmollaian, "A printed circularly polarized Y-shaped monopole antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 22-25, 2012.
doi:10.1109/LAWP.2011.2181314
3. Deng, I.-C., Q.-X. Ke, R.-J. Lin, and Y.-T. King, "A circular CPW-fed slot antenna resonated by the circular loop for broadband circularly polarized radiation," Microwave and Optical Technology Letters, Vol. 50, No. 5, 1423-1426, 2008.
doi:10.1002/mop.23359
4. Deng, I.-C., J.-B. Chen, Q.-X. Ke, J.-R. Chang, W.-F. Chang, and Y.-T. King, "A circular CPWfed slot antenna for broadband circularly polarized radiation," Microwave and Optical Technology Letters, Vol. 49, No. 11, 2728-2733, 2007.
doi:10.1002/mop.22881
5. Cao, R. and S. Yu, "Wideband compact CPW-fed circularly polarized antenna for universal UHF RFID reader," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 9, 4148-4151, Sept. 2015.
doi:10.1109/TAP.2015.2443156
6. Majidzadeh, M., J. Nourinia, and Ch. Ghobadi, "Compact CPW-fed antenna with circular polarization characteristics in WLAN frequency band," ACES Journal, Vol. 28, No. 10, Oct. 2013.
7. Jan, J., C. Pan, K. Chiu, and H. Chen, "Broadband CPW-fed circularly-polarized slot antenna with an open slot," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 3, 1418-1422, Mar. 2013.
doi:10.1109/TAP.2012.2231926
8. Zhou, S., P. Li, Y.Wang, W. Feng, and Z. Liu, "A CPW-fed broadband circularly polarized regularhexagonal slot antenna with L-shape monopole," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 1182-1185, 2011.
doi:10.1109/LAWP.2011.2172570
9. Li, G., H. Zhai, T. Li, L. Li, and C. Liang, "CPW-fed S-shaped slot antenna for broadband circular polarization," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 619-622, 2013.
doi:10.1109/LAWP.2013.2261652
10. Ojaroudi, M., N. Ojaroudi, and N. Ghadimi, "Enhanced bandwidth small square slot antenna with circular polarization characteristics for WLAN/WIMAX and C-bnad applications," ACES Journal, Vol. 28, No. 2, 156-161, 2013.
11. Ullah, U. and S. Koziel, "Design and optimization of a novel miniaturized low-profile circularly polarized wide-slot antenna," Journal of Electromagnetic Waves and Applications, Vol. 32, No. 16, 2099-2109, 2018.
doi:10.1080/09205071.2018.1496039
12. Rasool, N., K. Huang, A. B. Muhammad, and Y. Liu, "A wideband circularly polarized slot antenna with antipodal strips for WLAN and C-band applications," Int. J. RF Microw. Comput. Aided Eng., Vol. 29, e21945, 2019.
13. Liu, W.-W., Z.-H. Cao, and Z. Wang, "New broadband circularly polarized antenna with an inverted F-shaped feedline," Int. J. RF Microw. Comput. Aided Eng., Vol. 30, e22313, 2020.
14. Sze, J., C. G. Hsu, Z. Chen, and C. Chang, "Broadband CPW-fed circularly polarized square slot antenna with lightening-shaped feedline and inverted-L grounded strips," IEEE Transactions on Antennas and Propagation, Vol. 58, No. 3, 973-977, Mar. 2010.
doi:10.1109/TAP.2009.2039335
15. Li, G., H. Zhai, L. Li, and C. Liang, "A nesting-L slot antenna with enhanced circularly polarized bandwidth and radiation," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 225-228, 2014.
doi:10.1109/LAWP.2014.2301844
16. Mousazedeh, A., M. Naser-Moghaddasi, F. Geran, S. Mohammadi, and P. Zibadoost, "Broadband CPW-fed circularly polarized square slot antenna with arc-shaped and inverted-L grounded strips," ACES Journal, Vol. 28, No. 4, 314-320, 2013.
17. Arshad, S., F. A. Tahir, A. Rashid, M. M. S. Missen, and J. A. Flint, "Co-planar-waveguide fed circularly polarized antenna for wireless WLAN/LTE applications," Electromagnetics, Vol. 40, No. 5, 354-363, Jul. 3, 2020.
doi:10.1080/02726343.2020.1780379
18. Ullah, U., S. Koziel, and I. B.Mabrouk, "A simple-topology compact broadband circularly polarized antenna with unidirectional radiation pattern," IEEE Antennas and Wireless Propagation Letters, Vol. 18, No. 12, 2612-2616, Dec. 2019.
doi:10.1109/LAWP.2019.2945543
19. Jiang, L., C. Lu, W. Cao, and L. Sun, "A broadband CPW-fed dual circularly polarized slot antenna with modified L-shaped monopoles," IEICE Electronics Express, Vol. 15, No. 16, art. No. 20180645, 2018.
20. Xu, R., J. Li, J. Yang, K. Wei, and Y. Qi, "A design of U-shaped slot antenna with broadband dual circularly polarized radiation," IEEE Transactions on Antennas and Propagation, Vol. 65, No. 6, 3217-3220, Jun. 2017.
doi:10.1109/TAP.2017.2689069
21. Liu, H., Y. Liu, and S. Gong, "Broadband microstrip-CPW fed circularly polarised slot antenna with inverted configuration for L-band applications," IET Microwaves, Antennas and Propagation, Vol. 11, No. 6, 880-885, 2017.
doi:10.1049/iet-map.2016.0880
Submit
