The Department of Electrical Engineering at the University of Technology grants PHD to its student Mohammed Fadhel Hassan for his thesis (Design aspects of the multi-frequency multiplexing frequency filter for modern communication systems) on Dijlah hall in the department.In this work, the researcher presented several aspects of the design of a multi-beam transmission filter used in wireless communication applications. The research methodology in the design of the proposed filters is the gradual step-by-step design, which means adopting the first design step followed by the second for a multi-beam transponder. The advantage of this method lies in the freedom of design in terms of control of each ring packet separately.Prof.Dr. Raad Sami headed the discussion commission, with the membrane of Asst. Prof.Dr. Thamer Rasheed,Asst.Prof.Dr. Hadi Taresh,Asst.Prof.Dr.Adeed Hassan and Asst.Prof.dr.Jamal Rasool, and supervised by Asst.Prof.Dr.Ali Sadiq and Asst.Prof.Dr.Emad Shihab.