Pulses with sub-nanoseconds / nanoseconds rise time are used in high power radar, sterilization, testing the effect on electronic systems, food irradiation, electromagnetic welding, forming, wastewater processing, defence, medical electronics, etc. There are various methods for obtaining the mentioned low rise time pulses. In this book, a Marx generator, peaking capacitor and peaking switch are used to obtain high amplitude low rise time pulse. A radiating antenna is then connected to the output of peaking stage. Such a system is known as the high-power electromagnetic (EM) impulse radiator. Two such EM radiators were mathematically analysed, simulated, designed, fabricated and the experiments have been conducted in this book.