CATV filter assembly with improved electrical grounding
US6794957B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Dec 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H1/0007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A filter assembly for use in the CATV industry includes a circuit formed by components mounted upon at least one circuit board with a plurality of paths or traces on the board connecting each section of the circuit to a member at ground potential. The grounding member may be a grounding bus on the circuit board which is in contact with a housing wherein the circuit board is mounted, or the paths may extend from a circuit component to contact the housing directly. The paths are kept to a very short length, preferably not more than 2.5 millimeters and in no case longer than 5 millimeters. This avoids the presence of inductive and/or resistive parasitics in the paths, thereby avoiding the degradation of performance typical in comparable prior art filter circuits, particularly at higher frequencies, e.g., above about 300 MHz. In the preferred embodiment grounding buses in the form of elongated strips extend along opposite edge portions of the board. The housing is in two, cylindrical, telescopingly engaged portions. A pair of open slots extend from one end of the inner portion on opposite sides thereof for a portion of its length and edge portions of the circuit board which include the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.