Dr. K. Gouthami, Dr. Sakhamuri Suryanarayana. “A Novel Inter Digital Filtenna Structure With Dumb Bell Shaped and CSRR Defects in Ground for S-Band and ISM 2.4 GHz Band Applications”. Design Engineering, Dec. 2019, pp. 13 -26, http://www.thedesignengineering.com/index.php/DE/article/view/6185.