Spherical lens array based multi-beam antennae
A radio frequency antenna uses an array of spherical lens and mechanically movable radio frequency (RF) elements along the surface of the spherical lens to provide cellular coverage for a narrow geographical area. The antenna includes at least two spherical lens, where each spherical lens has an associated element assembly. Each element assembly has a track that curves along the contour of the exterior surface of the spherical lens and along which a radio frequency (RF) element can move. The antenna also includes a phase shifter configured to adjust a phase of the signals produced by the RF elements. The antenna includes a control mechanism configured to enable a user to move the RF elements along their respective tracks, and automatically configure the phase shifter to modify a phase of the output signals from the elements based on the relative positions between the RF elements.
1. An antenna comprising:
a first and a second spherical lens;
a first element assembly disposed along the external surface of the first spherical lens, the first element assembly comprising a first track and a first RF element movable along the first track and configured to provide a first output signal;
a second element assembly disposed along the exterior surface of the second spherical lens, the second element assembly comprising a second track and a second RF element movable along the second track and configured to provide a second output signal;
a phase shifter connected to the first and second RF elements; and
a control mechanism connected to the phase shifter, first RF element, and second RF element to:
enable a user to move the first element to a first position on the first track;
enable the user to move the second element to a second position on the second track; and
automatically modify a phase of the first output signal and a phase of the second output signal according to the relative positions between the first and second elements on the first and second tracks, respectively, wherein the control mechanism comprises a mechanical module that mechanically moves the first and second RF elements along the first and second tracks, respectively.
2. The antenna of claim 1 , wherein the control mechanism moves the first RF element to the first position, moves the second RF element to the second position, and automatically modifies the phase of the first output signal and the phase of the second output signal based on a single input.
3. The antenna of claim 1 , wherein the control mechanism comprises at least a processor and a memory and communicatively coupled with the phase shifter, the first RF element, and the second RF element.
4. The antenna of claim 1 , wherein the first and second tracks are shaped according to the contour of the surface of the first and second spherical lens, respectively.
5. The antenna of claim 1 , wherein the first and second spherical lens are stacked against each other along an axis.
6. The antenna of claim 5 , wherein the first and second tracks enable the first and second RF elements to move in a direction that is parallel to the axis.
7. The antenna of claim 5 , wherein the first and second tracks enable the first and second RF elements to move in a direction that is perpendicular to the axis.
8. The antenna of claim 1 , wherein the first element assembly further comprises a third RF element movable along the first track that provides a third output signal.
9. The antenna of claim 8 , wherein the second element assembly further comprises a fourth RF element movable along the second track that provides a fourth output signal.
10. The antenna of claim 9 , wherein the control mechanism is further programmed to:
enable the user to move the third RF element to a third position on the first track;
enable the user to move the fourth RF element to a fourth position on the second track; and
automatically modifies a phase of the third output signal and a phase of the fourth output signal according to the relative positions of the third and fourth RF elements on the first and second tracks, respectively.
11. The antenna of claim 1 , wherein the first and second spherical lenses are identical.
12. A method of adjusting an antenna's coverage area, wherein the antenna has a first radio frequency (RF) element associated with a first spherical lens, a second RF element associated with a second spherical lens, and a phase shifter communicatively coupled with the first and second RF elements, the method comprising the steps of:
moving, with a mechanical module, the first RF element to a first position along a surface of the first spherical lens, wherein the first RF element transmits a first output signal;
moving, with the mechanical module, the second RF element to a second position along a surface of the second spherical lens, wherein the second RF element transmits a second output signal; and
automatically modifying a phase of the first output signal and a phase of the second output signal according to the first and second positions of the first and second RF elements relative to their respective associated spherical lenses.
13. The method of claim 12 , wherein the first and second spherical lenses are stacked against each other along an axis.
14. The method of claim 13 , wherein moving the first RF element comprises moving the first RF element in a direction that is parallel to the axis.
15. The method of claim 13 , wherein moving the second RF element comprises moving the second RF element in a direction that is parallel to the axis.
16. The method of claim 13 , wherein moving the first RF element comprises moving the first RF element in a direction that is perpendicular to the axis.
17. The method of claim 12 , further comprising using a single input to move the first RF element, move the second RF element, and automatically modify the phase shifter.
18. The method of claim 12 , wherein the first and second spherical lenses are identical.