Chamath Kalanaka Vithanawasam, Su Hieng Tiong, Then Yi Lung, Antonio L. Cricenti. “COMPACT ULTRA-WIDEBAND MICROSTRIP ANTENNA WITH GROUND PLANE EXTENSIONS FOR TELEVISION WHITE SPACE (TVWS) APPLICATIONS”. International Journal of Advanced Science and Technology, Vol. 29, no. 6s, Apr. 2020, pp. 777 -82, http://sersc.org/journals/index.php/IJAST/article/view/8905.