Four wire dual mode spiral antenna
US4498084A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Dec 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dual mode broadband antenna especially designed to provide an omni-directional low angle or high angle radiation pattern which is predominately horizontally polarized is disclosed herein. This antenna utilizes four wire radiators in the form of an inverted conical log-spiral supported in a vertically extending fashion a predetermined distance above the horizontal ground plane. In order to alternatively operate the antenna in its high and low angle modes, first and second oppositely phased AC currents are applied to the radiators in two different ways using a simple switching device rather than a more complicated network of four hybrid circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.