Patch antenna with polarization uniformity control
US5006859A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1990 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Mar 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/245
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A patch antenna is formed of one or more flat disc-shaped radiators disposed parallel to and spaced apart from a common ground-plane element. At each radiator, there is a feed assembly of two feeds positioned to one side of a center of the radiator in space quadrature and excited in phase quadrature for generating circularly polarized radiation from the radiator. Each of the feeds, in a preferred embodiment of the invention, is formed as a post extending through an aperture in the ground-plane element partway to the radiator for capacitive coupling with the radiator. At each radiator, a reactance element on the form of a capacitive block extends from the ground-plane element partway to the radiator at a location diametrically opposite the feed assembly. Capacitive reactance of the reactance element is approximately one order of magnitude less than the sum of the capacitive reactance of the two feeds at each radiator to reduce mutual coupling between the feeds of each radiator to counteract any elliptical polarization to produce accurately a circular polarization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.