Premathilake, Tharanga, Jeevani Jayasinghe, Omar Saraereh, Karu Esselle, and Rajas Khokle. “High Directivity Broadband Hexagonal Fractal Ring Antenna with Modified Ground”. ECTI Transactions on Electrical Engineering, Electronics, and Communications 18, no. 1 (February 28, 2020): 1–8. accessed August 28, 2026. https://ph02.tci-thaijo.org/index.php/ECTI-EEC/article/view/239914.