D. H. Schaubert, D. M. Pozar and A. Adrian, “Effect of Microstrip Antenna Substrate Thickness and Permittivity: Comparison of Theories with experiment,” IEEE Transactions on Antennas and Propagation, Vol. 31, No. 6, 1989, pp. 83-90.
 A. Dalli, L. Zenkouar and S. Bri, “Study of Circular Sector Patch Array Antenna with Two and Four Elements for C and X Band,” European Journal of Scientific Research, Vol. 81, No. 2, 2012, pp.150-159.
 Z. Noroozi and F. Hojjat-Kashani, “Three-Dimensional FDTD Analysis of the Dual-Band Implantable Antenna for Continuous Glucose Monitoring,” Progress in Electromagnetic Research Letters, Vol. 28 No. 9, 2012, pp. 9-21. doi:10.2528/PIERL11070113
 S. C. Basaran and Y. E. Erdemli, “A Dual-Band SplitRing Monopole Antenna for Wlan Applications,” Microwave and Optical Technology letters, Vol. 51, No. 11, 2009, pp. 2685-2690. doi:10.1002/mop.24708
 S. Maddio, A. Cidronali and G. Manes, “A New Design Method for Single-Feed Circular Polarization Microstrip Antenna With an Arbitrary Impedance Matching Condition,” IEEE Transactions on Antennas and Prograpation, Vol. 59, No. 2, 2011, pp. 293-302.
 J. Sze and W. Chen, “Axial-Ratio-Bandwidth Enhancement of a Microstrip-Line-Fed Circularly Polarized Annular-Ring Slot Antenna,” IEEE Transactions on Antennas and Prograpation, Vol. 59, No. 7, 2011, pp. 23-33.
 HFSS. www.ansys.com
 A. Kaur and A. Singh “Comparison between the Radiation Pattern of Uniform Circular Array and Uniform Planar Array,” International Journal of Computer Networks and Wireless Communications, Vol. 2, No. 2, 2012, pp. 191193.