Nuangpirom, Pinit, Kitchar Chaitanu, Nuttapong Sidtigun, Thanawat Panhang, and Somsak Akatimagool. “The Study of Characteristics of the Waveguide Iris by Using Printed Circuit Board”. RMUTL Engineering Journal 5, no. 1 (June 30, 2020): 35–40. Accessed May 3, 2024. https://ph01.tci-thaijo.org/index.php/RMUTLEngJ/article/view/241498.