Tunable ultra-high frequency filter with variable capacitance tuning devices
US4380747A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1981 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Feb 25, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P7/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention relates to ultra-high frequency filters with variable capacitance tuning devices tunable in a wide frequency range. Each tuning device comprises two coaxial fingers, namely a fixed finger and a finger movable in the filter body. One of these fingers is hollow and the other has a tuning plunger, whose end is cylindrical and which is displaceable, e.g. by screwing in the body of the finger. The minimum capacitance obtained with a minimum penetration of the plunger, its end being level in the vicinity of the end of the corresponding finger, is adjustable by displacing the movable finger relative to the fixed finger. The supplementary variable capacitance is obtained by plunging the tuning plunger into the hollow finger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.