J. Vijayalakshmi., S B Vinay Kumar, Radhika Baskar, Prasad Jones Christydass. “Design of Circular Antenna With Codirectional CSRR For Penta Band Applications ”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Apr. 2020, pp. 9063 -72, https://sersc.org/journals/index.php/IJAST/article/view/12383.