Linear lumped reactance parameter networks loaded by resistors can be used to form pulses of different shapes. The most known applications require the networks that form pulses of the so-called quasi-rectangular shape. The network excitation is usually a step voltage, and it is required that the network output response is a pulse of finite duration. In a realizable network, the fronts of this pulse should have “rounded” corners, and the slopes of the fronts should also be finite. The chapter considers all procedures required in the synthesis of pulse-forming networks. Wideband amplifiers with a monotonic step response are frequently used for amplification of pulse signals. Most of the industrial emphasis in ultra-wideband technology (UWB) has focused on the short range, high-data-rate applications. Comparing the complexities of the network forming pulses of different shapes gives additional information for UWB system design.