Tahreer Mahmood, Omar Abdulkareem Mahmood, Hayder Khaleel AL-Qaysi. “An Improvement the Channel Characteristics Performance of Ultra-Wideband (UWB) by Controlling the Main Channel Parameters”. Design Engineering, June 2021, pp. 1329 -40, http://www.thedesignengineering.com/index.php/DE/article/view/1827.