Interference rejection antenna system
US4051474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1975 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Feb 18, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Interference from polarized signals is minimized by controlling the polarization of antennas having orthogonal dipole radiating elements. The antenna system utilizes microwave hybrids and phase shifters in a coaxial cable feed circuit that divides the power between horizontal and vertical dipole radiating elements. The circuit provides a variable antenna polarization that can be controlled to discriminate against interfering signals having any given polarization characteristics. Coaxial double folded baluns connect feed circuits to the dipole radiating elements and provide proper phasing and impedance transformation for efficient dipole operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.