1. Kumar, G. and K. P. Ray, Broadband Microstrip Antennas, Artech House, 2003.

2. Wong, K. L., Compact and Broadband Microstrip Antennas, John Wiley and Sons, 2002.
doi:10.1002/0471221112

3. Lu, J.-H. and K.-L. Wong, "Single-feed circularly polarized equilateral-triangular microstrip antenna with a tuning stub," IEEE Transaction on Antennas and Propagation, Vol. 48, No. 12, 1869-1872, 2000.
doi:10.1109/8.901277

4. Bernard Loo, B. K., Nasimuddin, and A. Alphones, "An E-shaped slotted-circular patch antenna for circularly polarized radiation and radiofrequency energy harvesting," Microwave and Optical Technology Letters, Vol. 58, No. 5, 868-875, 2016.
doi:10.1002/mop.29689

5. Wu, Q.-S., X. Zhang, and L. Zhu, "Co-design of a wideband circularly polarized filtering patch antenna with three minima in axial ratio response," IEEE Transaction on Antennas and Propagation, Vol. 66, No. 10, 5022 -5030, 2018.
doi:10.1109/TAP.2018.2856104

6. Zhao, Z., F. Liu, J. Ren, Y. Liu, and Y. Yin, "Dual-sense circularly polarized antenna with a dual-coupled line," IEEE Antennas and Wireless Propagation Letters, Vol. 19, No. 8, 1415-1419, 2020.
doi:10.1109/LAWP.2020.3003943

7. Zhang, X. and L. Zhu, "High-gain circularly polarized microstrip patch antenna with loading of shorting pins," IEEE Transaction on Antennas and Propagation, Vol. 64, No. 6, 2172-2178, 2016.
doi:10.1109/TAP.2016.2552544

8. Xiao, Z., L. Zhu, and N.-W. Liu, "Pin-loaded circularly-polarized patch antennas with wide 3-dB axial ratio bandwidth," IEEE Transaction on Antennas and Propagation, Vol. 65, No. 2, 521-528, 2017.
doi:10.1109/TAP.2016.2632728

9. Yang, H. and X. Liu, "Wearable dual-band and dual-polarized textile antenna for on and off body communications," IEEE Antennas and Wireless Propagation Letters, Vol. 19, No. 12, 2324-2328, 2020.
doi:10.1109/LAWP.2020.3032540

10. Liang, C.-F., Y.-P. Lyu, D. Chen, W. Zhang, and C.-H. Cheng, "A low-profile and wideband circularly polarized patch antenna based on TM11 and TM21," IEEE Transactions on Antennas and Propagation, Vol. 69, No. 8, 4439-4446, 2021.
doi:10.1109/TAP.2020.3049007

11. Lin, J.-F. and Q.-X. Chu, "Enhancing bandwidth of CP microstrip antenna by using parasitic patches in annular sector shapes to control electric field components," IEEE Antennas and Wireless Propagation Letters, Vol. 17, No. 5, 924-927, 2018.
doi:10.1109/LAWP.2018.2825236

12. Shi, Y. and J. Liu, "A circularly polarized octagon-star-shaped microstrip patch antenna with conical radiation pattern," IEEE Transactions on Antennas and Propagation, Vol. 66, No. 4, 2073-2078, 2018.
doi:10.1109/TAP.2018.2800801

13. Kovitz, J. M., H. Rajagopalan, and Y. Rahmat-Samii, "Circularly polarised half E-shaped patch antenna: A compact and fabrication-friendly design," IET Microwave Antennas and Propagation, Vol. 10, No. 9, 932-938, 2016.
doi:10.1049/iet-map.2015.0550

14. Deshmukh Amit, A. and A. A. Odhekar, "Dual band circularly polarized modified ψ-shape microstrip antenna," Progress In Electromagnetics Research C, Vol. 115, 161-174, 2021.
doi:10.2528/PIERC21062803

15. Tu, L. T., H. H. Tran, and H. C. Park, "Simple-structured dual-slot broadband circularly polarized antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 17, No. 3, 476-479, 2018.
doi:10.1109/LAWP.2018.2796608

16. Wei, K., J. Y. Li, L. Wang, R. Xu, and Z. J. Xing, "A new technique to design circularly polarized microstrip antenna by fractal defected ground structure," IEEE Transaction on Antennas and Propagation, Vol. 65, No. 7, 3721-3725, 2017.
doi:10.1109/TAP.2017.2700226

17. Chen, J., C. Jin, B. Zhang, and Z. Shen, "Combined triangle quarter-wavelength patches and their application to high-gain CP antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 19, No. 1, 104-108, 2019.
doi:10.1109/LAWP.2019.2954583

18. Chen, Q., J. Li, G. Yang, B. Cao, and Z. Zhang, "A polarization-reconfigurable high-gain microstrip antenna," IEEE Transaction on Antennas and Propagation, Vol. 67, No. 5, 3461-3466, 2019.
doi:10.1109/TAP.2019.2902750

19. Ta, S. X., V. C. Nguyen, B.-T. Nguyen-Thi, T. B. Hoang, A. N. Nguyen, K. K. Nguyen, and C. Dao- Ngoc, "Wideband dual-circularly polarized antennas using aperture-coupled stacked patches and single-section hybrid coupler," IEEE Access, Vol. 10, 21883-21891, 2022.
doi:10.1109/ACCESS.2022.3155120

20. Liang, C.-F., Y.-P. Lyu, D. Chen, and C.-H. Cheng, "Wideband circularly polarized stacked patch antenna based on TM11 and TM10," IEEE Transaction on Antennas and Propagation, Vol. 70, No. 4, 2459-2467, 2022.
doi:10.1109/TAP.2021.3118795

21. Wu, Q.-S., X.-Y. Tang, X. Zhang, L. Zhu, G. Zhang, and C.-B. Guo, "Circularly-polarized patch antennas with enhanced bandwidth based on capacitively coupled orthogonal patch radiators," IEEE Open Journal of Antennas and Propagation, Vol. 4, 472-483, 2023.
doi:10.1109/OJAP.2023.3270939

22. Yang, W.-J., Y.-M. Pan, and X.-Y. Zhang, "A single-layer low-profile circularly polarized filtering patch antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 20, No. 4, 602-606, 2021.
doi:10.1109/LAWP.2021.3058790

23. Cheng, G., B. Huang, Z. Huang, and L. Yang, "A high-gain circularly polarized filtering stacked patch antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 22, No. 5, 995-999, 2023.
doi:10.1109/LAWP.2022.3229951

24. Wei, H., Y. He, Y. Li, S.-W. Wong, and L. Zhu, "A compact ultra wideband circularly polarized antenna array with shared partial patches," IEEE Antennas and Wireless Propagation Letters, Vol. 20, No. 12, 2280-2284, 2021.
doi:10.1109/LAWP.2021.3107218

25. Anamika, V., M. Arrawatia, and G. Kumar, "High gain wideband circularly polarized microstrip antenna array," IEEE Transaction on Antennas and Propagation, Vol. 70, No. 11, 11183-11187, 2022.
doi:10.1109/TAP.2022.3209191

26. Deshmukh Amit, A., A. V. Doshi, and A. Odhekar, "Gap coupled design star shape microstrip antenna for dual band and wide band circular polarized response," International Journal of RF & Microwave, Computer Aided Engineering, Vol. 29, No. 5, 664-674, 2019.

27. IE3D Version 12, , , Zeland Software.