Delay line device having symmetrical delay path

Claim 1

A delay line device which comprises a substrate made of an electrically insulating material, a transmission path formed by a thin film containing copper on one surface of the substrate, said transmission path including at least two parts arranged in a symmetrical manner, and a ground electrode formed on another opposing surface of the substrate, each of said parts being of a zig-zag configuration comprising a plurality of generally straight sections connected by a plurality of bent sections, said parts being adjacent each other and symmetrical about an axis intermediate said parts and extending in a direction perpendicular to said generally straight sections, the uppermost straight sections of said parts being contiguous and electrically connected, first connecting electrodes formed adjacent the lower most straight sections on said one surface of the substrate and respective ones of said first electrodes being connected with a respective end of the transmission path, and second connecting electrodes formed on said another opposing surface of the substrate and connected with portions of the ground electrode, said second connecting electrodes being spaced from each other.