Tunable fiberglass whip antenna
US4214247A · kind A · utility
9Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1978 |
| Grant date | Jul 22, 1980 |
| Priority date | — |
| Expiry date | Oct 13, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A tunable fiberglass whip antenna comprises an elongated fiberglass core having a conductive wire coiled around the core and serving as the antenna. The uppermost extremity of the wire is tightly coiled around an axial bore within the fiberglass. A metal insert, fixed within the fiberglass bore is in threaded engagement with a set screw accessible from the top of the antenna. By adjusting the longitudinal position of the set screw relative to the tightly wound wire at the end of the antenna, the inductive coupling between the coil and screw is varied to thereby change the effective length of the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.