Nuangpirom, P. ., Chaitanu, K. ., Sidtigun, N. ., Panhang, T. . and Akatimagool, S. . (2020) “The Study of Characteristics of the Waveguide Iris by using Printed Circuit Board”, RMUTL Engineering Journal, 5(1), pp. 35–40. doi: 10.14456/rmutlengj.2020.5.