Claims
- 1. An antenna element including:
a reflective element having a reflecting surface; a feed rotatable about an axis; rotating means for rotating the feed about the axis, the rotating means being coupled to the feed, wherein the reflecting surface faces the feed and rotation of the feed changes a polarisation signal emanating from the antenna element or being received by the antenna element.
- 2. An antenna element including:
a reflective element having a reflecting surface; a non-metallic drive cord or belt; a feed rotatable about an axis; a drive motor located outside or behind the radiating aperture; wherein the reflecting surface faces the feed and rotation of the feed changes a polarisation signal emanating from the antenna element or being received by the antenna element, and rotation of the motor shaft moves the drive cord or belt causing the feed to rotate.
- 3. An antenna element as in claim 2 wherein the reflecting surface is concave.
- 4. An antenna element as in claim 3 wherein the axis is common to the feed and the reflective element.
- 5. An antenna element as in claim 2 wherein the reflective element is parabolic in shape.
- 6. An antenna element as in claim 2 wherein the antenna element is adjacent to other further antenna elements, and a common drive cord or belt is used to rotate the feed or each of the elements.
- 7. An antenna element as in claim 2 further including a sub-reflector having a reflector, the feed being placed between the sub-reflector and the reflective element with the reflector facing the reflecting surface.
- 8. An array of at least two antenna elements, each antenna element including:
a reflective element having a reflecting surface; a feed rotatable about an axis; the array including a common rotating means for rotating each feed of each antenna element, the common rotating means being coupled to each feed, wherein each reflecting surface faces a corresponding feed and activation of the common rotating means rotates each feed simultaneously.
- 9. An array as in claim 8 wherein each reflecting surface is concave.
- 10. An array as in claim 9 wherein each reflective element is parabolic in shape.
- 11. An array as in claim 8 wherein each antenna element further includes a sub-reflector having a reflector, the feed being placed between the sub-reflector and the reflective element and the reflector faces the reflecting surface.
- 12. An array as in claim 8 wherein the common rotating means includes a drive motor and a drive means, the drive means being coupled to the drive motor and to each feed such that activation of the motor rotates each feed.
- 13. An array as in claim 12 wherein each feed is mounted on a pulley.
- 14. An array as in claim 13 wherein the drive means is a drive cord wrapped around each pulley.
- 15. An array as in claim 13 wherein the drive means is a chain and each pulley has outwardly extending teeth for engaging the chain.
Parent Case Info
[0001] This application relates to U.S. Provisional Patent Application No. 60/256,937 filed Dec. 21, 2000.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60256937 |
Dec 2000 |
US |