Annular slot antenna
US4994817A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jul 24, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/0006
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An inexpensive, efficient, broadband, slot-type antenna with unidirectional sensitivity includes a slot-forming means defining a plurality of substantially concentric and generally coplanar annular slots and a non-resonant antenna connection means for transmitting electromagnetic energy to and from the plurality of annular slots. The antenna connection means forms a plurality of non-resonant, radially-extending cavities that are adapted to combine electromagnetic energy received at the plurality of concentric, annular slots substantially in phase and to divide electromagnetic energy between the plurality of concentric, annular slots for transmission from the slots generally in phase and along the central slot axis that lies perpendicular to the two concentric, annular, coplanar slots. The antenna may also include a plurality of polarizing antenna elements carried by the slot-forming means adjacent at least one or two of the substantially concentric, annular slots to enhance the unidirectional sensitivity of the antenna. Such a plurality of polarizers may be carried by the slot-forming means in a plurality of locations spaced above and over at least one or two of the concentric annu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.