Yusop, S. H., N. Misran, M. T. Islam, and M. Y. Ismail. “Analysis of Concentric Split Ring Square Element for Broadband Reflectarray Antenna”. International Journal of Integrated Engineering, Vol. 1, no. 3, 1, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/100.