Yudi Barnadi. 2021. “The Influence of Changes in the Dielectric Constant on Return Loss, Vswr, Isolation and Phase Difference Microstrip Hybrid Coupler For Coastal Radar Applications”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12 (8):1104-11. https://turcomat.org/index.php/turkbilmat/article/view/2999.