M. . Muhsin, K. . Kamardin, and Y. . Yamada, “Focal Region Ray Tracing of Conventional and Shaped Lens Antenna”, IJIE, vol. 15, no. 3, pp. 131–139, Aug. 2023, Accessed: Apr. 08, 2026. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/12882