Microwave antenna
US4792810A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1986 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jul 22, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A planar antenna for circular polarized microwaves incorporates a substrate sandwiched between conductive layers having a plurality of openings arranged in a rectangular array, with a pair of perpendicular excitation probes supported on the substrate in alignment with each opening, and a feed circuit for interconnecting the excitation probes in a predetermined phase relationship. Two additional conductive elements may be supported on the substrate in alignment with the excitation probes to provide improved impedance matching. The feed circuit may incorporate a pair of quarter wavelength feed lines connected to the excitation probes, with a resistance element interconnected between the feed lines. The feed point of the antenna may be located near the center of the array, occupying a position normally occupied by one of the pairs of excitation probes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.