1. 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 Trans. Antennas Propagat., Vol. 57, No. 4, 1264-1267, 2009.
doi:10.1109/TAP.2009.2015855
2. Waterhouse, R., Printed Antennas for Wireless Communications, Wiley, Hoboken, NJ, 2007.
3. Wong, K. L., Planar Antennas for Wireless Communications, Wiley, Hoboken, NJ, 2003.
4. Pozar, D. M. and D. H. Schaubert, Microstrip Antennas: The Analysis and Design of Microstrip Antennas and Arrays, IEEE Press, Piscataway, NJ, 1995.
5. Chiu, C.-N. and C.-C. Yang, "A new board-integrated single microstrip-fed circularly polarized monopole antenna for global positioning satellite receivers," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 7, 903-909, 2010.
doi:10.1163/156939310791285209