1. Chen, L., X. S. Ren, Y. Z. Yin, and Z. D. Wang, "Broadband CPW-fed circularly polarized antenna with an irregular slot for 2.45 GHz RFID reader," Progress In Electromagnetics Research Letters, Vol. 41, 77-86, 2013.
doi:10.2528/PIERL13052020

2. Chen, H. M., Y. K. Wang, Y. F. Lin, C. Y. Lin, and S. C. Pan, "Microstrip-fed circularly polarized square-ring patch antenna for GPS applications," IEEE Transactions on Antennas and Propagation, Vol. 57, No. 4, Apr. 2009.
doi:10.1109/TAP.2009.2015855

3. Prajapati, P. R., G. G. K. Murthy, A. Patnaik, and M. V. Kartikeyan, "Design and testing of a compact circularly polarised microstrip antenna with fractal defected ground structure for l-band applications," IET Microwaves, Antennas & Propagation, Vol. 9, No. 11, 1179-1185, 2015.
doi:10.1049/iet-map.2014.0596

4. Lo, W. K., J.-L. Hu, C. H. Chan, and K. M. Luk, "Circularly polarized patch antenna with an L-shaped probe fed by a microstrip line," Microwave and Optical Technology Letters, Vol. 51, Oct. 2000.

5. Khalily, M., M. K. A. Rahim, and A. A. Kishk, "Planar wideband circularly polarized antenna design with rectangular ring dielectric resonator and parasitic printed loops," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 905-908, 2012.
doi:10.1109/LAWP.2012.2211853

6. Ismail, M. F., M. K. A. Rahim, M. R. Hamid, and H. A. Majid, "Miniature dual-fed circularly polarized antenna with slotted ground plane," 2012 Asia Pacific Microwave Conference Proceedings, 1187-1189, Dec. 4-7, 2012.

7. Sabran, M. I., S. K. A. Rahim, M. S. A. Rani, and M. Z. M. Nor, "A single band dual-fed circular polarization microstrip antenna for RFID application," RF and Microwave Conference (RFM), 2011 IEEE International, 137-140, Dec. 12-14, 2011.

8. Song, C. Y., Y. Huang, Q. Xu, and U. U. Hussine, "A broadband circularly polarized cross-dipole antenna for GNSS applications," Loughborough Antennas & Propagation Conference, 2015.

9. Baik, J. W., T. H. Lee, S. Pyo, S. M. Han, J. Jeong, and Y. S. Kim, "Broadband circula polarized crossed dipole with parasitic loop resonators and its arrays," IEEE Trans. Antennas Propagat., Vol. 59, No. 1, 80-88, 2011.
doi:10.1109/TAP.2010.2090463

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 Transactions on Antennas and Propagation, Vol. 60, No. 3, 1221-1227, 2012.
doi:10.1109/TAP.2011.2180319

11. Yang, X. J., J. D. Yuan, and G. D. Han, "Compact circularly polarized crossed dipole antenna with chip inductors and square rings loading for GPS applications," Progress In Electromagnetics Research Letters, Vol. 58, 29-35, 2016.
doi:10.2528/PIERL15111909

12. Zuo, S. L., Q. Q. Liu, and Z. Y. Zhang, "Wideband dual-polarized crossed-dipole antenna with parasitical crossed-strip for base station applications," Progress In Electromagnetics Research C, Vol. 48, 159-166, 2014.
doi:10.2528/PIERC14021101

13. He, Y. J., W. He, and H. Wong, "A wideband circularly polarized cross-dipole antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 67-70, 2014.

14. Valagiannopoulos, C. A., "Semi-analytic solution to a cylindrical microstrip with inhomogeneous substrate," Electromagnetics, Vol. 27, 527-544, 2007.
doi:10.1080/02726340701669524

15. Valagiannopoulos, C. A., "Electromagnetic propagation into parallel-plate waveguide in the presence of a skew metallic surface," Electromagnetics, Vol. 31, 593-605, 2011.
doi:10.1080/02726343.2011.621111

16. Sabran, M. I., S. K. A. Rahim, M. S. A. Rani, and M. Z. M. Nor, "A single band dual-fed circular polarization microstrip antenna for RFID application," IEEE International RF and Microwave Conference (RFM 2011), 137-140, Dec. 12-14, 2011.

17. Bao, X. L. and M. J. Ammann, "A printed dipole antenna for wideband circular polarization operation," 2009 3rd European Conference on Antennas and Propagation, 2367-2370, Mar. 23-27, 2009.