3671885 is referenced by 26 patents and cites 4 patents.

Passive devices for signal routing such as directional couplers, hybrid splitters and power inserters, for use in CATV or similar signal distribution systems having improved operating characteristics are obtained by the incorporation of pi-section high-pass filters into such devices. Conventional splitters and directional couplers are modified by the addition of inductances and capacitances so that the required pi-section high-pass filters are formed, with one inductive element of such a filter being constituted by an inductive deviation, for example, a leakage inductance of an existing component of such a device. Improved radiofrequency signal return losses and inter-tap isolation are provided over a much greater frequency range than was heretofore possible.

Title
High frequency signal routing devices for use in catv systems
Application Number
05/094,230
Publication Number
3671885
Application Date
December 2, 1970
Publication Date
June 20, 1972
Inventor
Frank C Pennypacker Lindsay
Agent
Frank I Piper
Arne I Fors
Assignee
Lindsay Specialty Products
IPC
H03h 07/48
H04N 07/10
H03H 07/48
H03H 07/00
View Original Source