Patch antenna
US4821041A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Dec 17, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/0442
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microwave patch antenna, comprising a substrate of high dielectric constant, an aperture in the substrate, a patch conductor positioned on one side of the conductor and juxtaposed over said aperture, a ground plane on the other side of the substrate and having an aperture juxtaposed to at least a substantial proportion of the patch conductor. A conductive cavity is RF-coupled to the ground plane at the aperture, the cavity extending away from the substrate and being short-circuited at its end remote therefrom; in the operating frequency range of the antenna, the cavity forms a waveguide constituting an inductance. The length of the cavity may be adjustable to tune the antenna, the length of the cavity being sufficient for the resonant frequency of the antenna to decrease with increasing cavity length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.