Three-element antenna formed of orthogonal loops mounted on a monopole
US4433336A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1982 |
| Grant date | Feb 21, 1984 |
| Priority date | — |
| Expiry date | Feb 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/29
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A three-element directional/omnidirectional antenna adapted for use in both transmitting and receiving modes. Crossed loop antennas are mounted on top of a monopole whip antenna and are electrically coupled thereto. Each of the loop antennas consists of an outer larger primary loop and an inner secondary loop joined at its base to the primary loop. Both the primary and secondary loops are interrupted at their top ends opposite the point where they join the monopole antenna. A tuning capacitor is coupled between the two halves of each of the primary loops, while a coaxial antenna feeds the two secondary loops. The coaxial cables feeding the secondary loops pass through a dual ferrite choke disposed within the monopole antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.