A novel dual-broadband circularly polarized folded slot antenna with single-feed is presented. The proposed antenna consists of two folded annular slots. By adjusting the asymmetric widths of the two slots, circularly polarized radiation can be achieved in two different bands. By optimizing the parameters of the proposed antenna, two wide impedance bandwidths of 35.0% (1.91-2.72 GHz) and 46.5% (4.36-7.00 GHz) can be obtained, and two axial ratio bandwidths are 2.36-2.56 GHz and 5.68-6.04 GHz, respectively. The antenna with simple structure is fabricated and measured. Good agreement between the simulated and measured results is also achieved.
2. Sze, J.-Y., T.-H. Hu, and T.-J. Chen, "Compact dual-band annular-ring slot antenna with meandered grounded strip," Progress In Electromagnetics Research, Vol. 95, 299-308, 2009.
3. Lee, Y.-C. and J.-S. Sun, "Compact printed slot antennas for wireless dual- and multi-band operations," Progress In Electromagnetics Research, Vol. 88, 289-305, 2008.
4. Eldek, A.-A., A.-Z. Elsherbeni, and C.-E. Smith, "Dual-wideband square slot antenna with a u-shaped printed tuning stub for personal wireless communication systems," Progress In Electromagnetics Research, Vol. 53, 319-333, 2005.
5. Tiang, J.-J., M.-T. Islam, N. Misran, and J.-S. Mandeep, "Circular microstrip slot antenna for dual-frequency RFID application," Progress In Electromagnetics Research, Vol. 120, 499-512, 2011.
6. 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.
7. Deng, J.-Y., L.-X. Guo, T.-Q. Fan, Z.-S. Wu, Y.-J. Hu, and J.-H. Yang, "Wideband circularly polarized suspended patch antenna with indented edge and gap-coupled feed," Progress In Electromagnetics Research, Vol. 135, 151-159, 2013.
8. Sun, L., Y.-H. Huang, J.-Y. Li, and Q.-Z. Liu, "A wideband circularly polarized candy-like patch antenna," Journal of Electromagnetic Waves and Applications, Vol. 25, No. 8-9, 1113-1121, 2011.
9. Sze, J.-Y. and S.-P. Pan, "Design of broadband circularly polarized square slot antenna with a compact size," Progress In Electromagnetics Research, Vol. 120, 513-533, 2011.
10. Lin, Y.-F., Y.-K. Wang, H.-M. Chen, and Z.-Z. Yang, "Circularly polarized crossed dipole antenna with phase delay lines for RFID handheld reader," IEEE Trans. on Antennas and Propag., Vol. 60, No. 3, 1221-1227, Mar. 2012.
11. Nayeri, P. and K.-F. Lee, "Dual-band circularly polarized antennas using stacked patches with asymmetric U-slots," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 492-495, 2011.
12. Hsieh, W.-T., T.-H. Chang, and J.-F. Kiang, "Dual-band circularly polarized cavity-backed annular slot antenna for GPS receiver," IEEE Trans. on Antennas and Propagat., Vol. 60, No. 4, 2076-2080, Apr. 2012.
13. Bao, X.-L. and M.-J. Ammann, "Monofilar spiral slot antenna for dual-frequency dual-sense circular polarization," IEEE Trans. on Antennas Propagat., Vol. 59, No. 8, 3061-3065, Aug. 2011.
14. Chen, Q., H.-L. Zheng, J.-H. Hu, and S.-G. Jiang, "Design of CPW-fed dual-band circularly-polarized annular slot antenna with two perturbation strips," Progress In Electromagnetics Research C, Vol. 28, 195-207, 2012.
15. Heidari, A.-A., M. Heyrani, and M. Nakhkash, "A dual-band circularly polarized stub loaded microstrip patch antenna for GPS applications," Progress In Electromagnetics Research, Vol. 92, 195-208, 2009.