Shamsudin, Nur Azura, and Shaharil Mohd Shah. “Miniaturized Dual-Band Dual-Mode Microstrip Patch Antenna With Defected Ground Structure for Wearable Applications”. Journal of Electronic Voltage and Application, vol. 2, no. 2, Dec. 2021, pp. 120-8, https://penerbit.uthm.edu.my/ojs/index.php/jeva/article/view/9361.