Mohamad Fadhil, Nurul Husna, et al. “Gain Enhancement of E-Shaped Microstrip Patch Antenna for Underground RFID Reader Application”. International Journal of Integrated Engineering, vol. 17, no. 2, July 2025, pp. 196-07, https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/17152.