Multidirectional feed and flush-mounted surface wave antenna
US4682180A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1985 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q13/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a multidirectional feed which can be used by itself or preferably incorporated within a surface wave structure to form a flush-mounted antenna on, for example, a mobile unit. The feed arrangement comprises a ground plane including an annular cavity with a smaller annular slot. The annular slot is connected by multiple, spaced-apart, leads to an associated transceiver. The annular cavity is also formed to prevent both a shorting of the radio waves therein and the radio waves from propagating away from the cavity in a direction opposite the slot. A surface wave structure is disposed preferably with the feed centrally mounted and can comprise any suitable structure including annular corrugations and/or a dielectric layer to provide a flush-mounted antenna arrangement which provides radiation in azimuth in all directions with moderate elevation gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.