Ismail, F. F. ., M. A. . El-Aasser, and N. H. . Gad. “A Parasitic Hat for Microstrip Antenna Design Based on Defected Structures for Multiband Applications”. Applied Computational Electromagnetics Society Journal (ACES), vol. 37, no. 05, May 2022, pp. 568-75, doi:10.13052/2022.ACES.J.370506.