Bharath Kumar, K., and T. Shanmuganantham. “Investigation of SIW Directional Coupler for 60ghz Mm-Wave Applications”. International Journal of Engineering and Technology 7, no. 1.8 (February 9, 2018): 1–5. Accessed May 18, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/9440.