Vandalism-resistant UHF antenna
US4661821A · kind A · utility
63Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1985 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Mar 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/065
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A vandalism-resistant antenna for the UHF band comprises a ring-shaped radiator printed on a dielectric board or disc mounted within a shallow enclosure of insulating material having high impact strength. The radiator is approximately 1/4 wavelength long at the operating frequency and is located at a constant spacing above a ground plane. A coaxial RF connector fastens the radiator-board assembly to a mounting surface serving as the ground plane, and couples the antenna to a transmitter or receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.