Multi-Path Networks : A Novel Approach to Linear-Phase Filtering and Shaping

The paper presents a novel approach to the design of filtering and shaping networks having perfectly linear phase response and good input match at all frequencies, albeit with appreciable transmission loss. The method involves the provision of several transmission paths between the input and the output : about half the signal power passes through a main path, while the remainder is diverted through pairs of side-paths obeying certain requirements. Interference at the recombining points cause pass-and stop-bands or amplitude-shaped transmission, the unwanted power being taken up in resistive loading rather than reflected at the input.