A simple broadband circularly polarized (CP) aperture antenna is proposed in this letter. The antenna is composed of an L-shaped feed line and a circular aperture. With the newly introduced perturbation slots, a new resonant mode TE31 is generated, which can widen the CP bandwidth without increasing the antenna size. Measured results of the fabricated antenna shows 93.5% (2.9-8 GHz) impedance bandwidth (|S11|<-10 dB) and 66.6% (3-6 GHz) 3 dB axial-ratio bandwidth. The overlapped CP working band covers the entire WiMAX, WLAN and lower frequency 5G bands. Its peak gain is 4.9 dBic at 3.5 GHz, and its gain variation is less than 1 dBic within 3-5.8 GHz band. Design considerations, empirical formulas and surface current analysis are also presented and discussed.
2. Mohammadi, P. and V. Rafii, "High gain and broadband circularly polarized square slot antenna array," Progress In Electromagnetics Research Letters, Vol. 43, 105-113, 2013.
doi:10.2528/PIERL13080701
3. Xu, P., Z.-H. Yan, T.-L. Zhang, and X.-Q. Yang, "Broadband circularly polarized slot antenna array with Fan-shaped feed line and L-shaped grounded strips," Progress In Electromagnetics Research Letters, Vol. 44, 125-131, 2014.
doi:10.2528/PIERL13121102
4. Row, J.-S. and S.-W. Wu, "Circularly-polarized wide slot antenna loaded with a parasitic patch," IEEE Trans. Antennas Propag., Vol. 56, No. 9, 2826-2832, 2008.
doi:10.1109/TAP.2008.928769
5. Zhang, H., Y.-C. Jiao, L. Lu, and C. Zhang, "Broadband circularly polarized square-ring-loaded slot Antenna with flat gains," Antennas Wireless Propag. Lett., Vol. 16, 29-32, 2017.
doi:10.1109/LAWP.2016.2553109
6. Le, T. T. and H. C. Park, "Very simple circularly polarised printed patch antenna with enhanced bandwidth," Electron Lett., Vol. 50, 1896-1898, 2014.
doi:10.1049/el.2014.2963
7. Le, T. T., V. H. The, and H. C. Park, "Simple and compact slot-patch antenna with broadband circularly polarized radiation," Microwave Opt. Technol. Lett., Vol. 58, No. 7, 1634-1641, 2016.
doi:10.1002/mop.29868
8. Yeung, S. H., K. F. Man, and W. S. Chan, "A bandwidth improved circular polarized slot antenna using a slot composed of multiple circular sectors," IEEE Trans. Antennas Propag., Vol. 59, No. 8, 3065-3070, 2011.
doi:10.1109/TAP.2011.2158953
9. Yang, W. and J. Zhou, "Wideband circularly polarized cavity-backed aperture antenna with a parasitic square patch," Antennas Wireless Propag. Lett., Vol. 13, 197-200, 2014.
doi:10.1109/LAWP.2014.2298252
10. 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, 2008.
doi:10.1002/mop.23290
11. Panahi, A., X. L. Bao, G. Ruvio, and M. J. Ammann, "A printed triangular monopole with wideband circular polarization," IEEE Trans. Antennas Propag., Vol. 63, No. 1, 415-418, 2014.
doi:10.1109/TAP.2014.2365828
12. Zhang, L., Y. C. Jiao, Y. Ding, B. Chen, and Z. B.Weng, "CPW-fed broadband circularly polarized planar monopole antenna with improved ground-plane structure," IEEE Trans. Antennas Propag., Vol. 61, No. 9, 4824-4828, 2013.
doi:10.1109/TAP.2013.2267719
13. Li, G., H. Zhai, T. Li, L. Li, and C. Liang, "CPW-fed S-shaped slot antenna for broadband circular polarization," Antennas Wireless Propag. Lett., Vol. 12, 619-622, 2013.
doi:10.1109/LAWP.2013.2261652
14. Simruni, M. and S. Jam, "A circularly-polarized compact wideband patch antenna loaded by metamaterial structures," Progress In Electromagnetics Research C, Vol. 78, 93-104, 2017.
doi:10.2528/PIERC17070702
15. Deng, J., L. Guo, T. Fan, Z. Wu, Y. Hu, and J. Yang, "Wideband circularly polarized suspended patch antenna with indented edge and gapcoupled feed," Progress In Electromagnetics Research, Vol. 135, 151-159, 2013.
doi:10.2528/PIER12111601
16. Zhang, L., Y.-C. Jiao, and Z.-B. Weng, "Wideband circularly polarized dielectric resonator antenna with a square spiral microstrip feedline," Progress In Electromagnetics Research Letters, Vol. 41, 11-20, 2013.
doi:10.2528/PIERL13042802
17. Chen, Q., H.-L. Zheng, T. Quan, and X. Li, "Broadband CPW-fed circularly polarized antenna with equiangular tapered-shaped feedline for ultra-wideband applications," Progress In Electromagnetics Research C, Vol. 26, 83-95, 2012.
doi:10.2528/PIERC11110603
18. Lin, F. H., Z. N. Chen, and W. Liu, "A metamaterial-based broadband circularly polarized aperture-fed grid-slotted patch antenna," Proc. IEEE Asia-Pacific Conf. Antennas Propag. (APCAP), 353-354, Kuta, Indonesia, 2015.
19. Ellis, M. S., J. J. Kponyo, and A.-R. Ahmed, "A compact wideband circularly polarized L-slot antenna edge-fed by a microstrip feedline for C-band applications," Progress In Electromagnetics Research Letters, Vol. 65, 95-102, 2017.
doi:10.2528/PIERL16111105
Submit
