Notch filter using helical transmission line and coaxial capacitor
US5032807A · kind A · utility
7Cited by
11References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Jul 10, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/0115
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A notch filter comprises a helical transmission line enclosed in a conductive activity, and a high Q capacitor coupled to form a series-resonant circuit. The capacitor is fabricated from a portion of coaxial cable having an outer conductor forming a first plate of the capacitor and an inner conductor forming the second plate of the capacitor. The notch filter is particularly suited for rejecting terrestrial interference in a C-band tuner at an intermediate frequency of about 400 MHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.