Yeap, Kim Ho, Zhi Ying Goh, Koon Chun Lai, Humaira Nisar, Peh Chiong Teh, and Zairi Ismael Rizman. 2018. “Analysis of Hammerhead Probes in a Rectangular Waveguide”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 10 (1-4):115-18. https://jtec.utem.edu.my/jtec/article/view/3602.