Variable capacitor with wobble motor disc selector

• US 6,147,856 A
• Filed: 03/31/1999
• Issued: 11/14/2000
• Est. Priority Date: 03/31/1999
• Status: Expired due to Fees

• Current Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Original Assignee: International Business Machines Corporation
• Inventors: Karidis, John P.
• Primary Examiner(s): Dinkins, Anthony
• Application Number:
  US09/282,575
• Time in Patent Office: 594 Days
• Field of Search: 361/277, 361/278, 361/287, 361/289-280, 361/292, 361/293, 361/298.2, 361/297, 361/298.1
• US Class Current: 361/277
• CPC Class Codes: H01G 5/18 due to change in inclination, e.g. by flexing, by spiral wrapping

Abstract

Devices for use in highly integrated radio frequency transceivers utilize micro-electro-mechanical systems, or wobble motors, to form superior switches and to select and vary components that determine different frequencies of operation. Each device has a substrate with concentric rings of electrodes and contacts. A circular rotor is centrally pivoted or wobbled to engage the contacts along its circumferential edge. The rotor may be mechanically or materially modified to create symmetric or asymmetric forms which interact with one or more stationary capacitor electrodes on the substrate. The positioning of the rotor forms in terms of rotation, overlap and separation, relative to the capacitor electrodes, varies the capacitance.

Claims

1. A wobble disc capacitor, comprising:

a substantially planar stator having a substrate with a central pivot;

an annular contact mounted on the substrate of the stator substantially concentric with the central pivot;

an annular array of drive elements mounted on the substrate of the stator substantially concentric between the central pivot and the contact;

at least one stationary capacitor electrode mounted to the substrate of the stator radially inward of the contact;

a circular, substantially planar, electrically conductive rotor mounted to the central pivot such that a center point of the rotor is axially spaced-apart from a center point of the stator, the rotor having an outer perimeter and being substantially concentric with the stator, the rotor also being tilted about the central pivot relative to the stator such that the perimeter is aligned and touches the contact at all times; and

wherein

in response to the activation of at least one drive element, the rotor is movable to a plurality of positions about the stator to define a gap between the rotor and the capacitor electrode to establish a variable capacitance value therewith for circuit application.

2. The wobble disc capacitor of claim 1, further comprising a formation on the rotor;

and wherein

an amount of overlap between the formation and the capacitor electrode is manipulated by cycling the rotor between the positions to further vary the capacitive value therewith for circuit application.

3. The wobble disc capacitor of claim 2 wherein the formation is a conductive capacitor coupling surface.

4. The wobble disc capacitor of claim 3 wherein the capacitor electrode on the substrate comprises two capacitor electrodes.

5. The wobble disc capacitor of claim 4 wherein the two capacitor electrodes are located adjacent to each other.

6. The wobble disc capacitor of claim 4 wherein the two capacitor electrodes are spaced apart from each other on opposite sides of the central pivot.

7. The wobble disc capacitor of claim 2 wherein the formation is a hole in an underside of the rotor.

8. The wobble disc capacitor of claim 2 wherein the formation is a pair of holes in an underside of the rotor.

9. The wobble disc capacitor of claim 8 wherein the pair of holes are spaced apart from each other on opposite sides of the central pivot.

10. The wobble disc capacitor of claim 1 wherein the rotor rotates about the central pivot with respect to the stator.

11. The wobble disc capacitor of claim 1 wherein the capacitor electrode is located radially inward of the drive elements.

12. The wobble disc capacitor of claim 1, further comprising at least one electrical component associated with one of the stator and the rotor for at least one of said drive elements.

13. The wobble disc capacitor of claim 12, wherein said electrical component is frequency determinative.

14. A wobble disc variable capacitor, comprising:

a substantially planar stator having a substrate with a central pivot;

an annular contact mounted on the substrate of the stator substantially concentric with the central pivot;

an annular array of drive elements mounted on the substrate of the stator substantially concentric between the central pivot and the contact;

at least one stationary capacitor electrode mounted to the substrate of the stator radially inward of the contact;

a circular, substantially planar, electrically conductive rotor mounted to the central pivot such that a center point of the rotor is axially spaced-apart from a center point of the stator, the rotor having an outer perimeter and being substantially concentric with the stator, the rotor also being tilted about the central pivot relative to the stator such that the perimeter is aligned and touches the contact at all times;

a conductive capacitor coupling surface on the rotor; and

wherein

in response to the activation of at least one drive element, the rotor is movable to a plurality of positions about the stator to define a gap between the rotor and the capacitor electrode to establish a variable capacitance value therewith for circuit application; and

wherein

an amount of overlap between the capacitor coupling surface and the capacitor electrode is manipulated by cycling the rotor between the positions to further vary the capacitive value therewith for circuit application.

15. The wobble disc variable capacitor of claim 14 wherein the capacitor electrode on the substrate comprises two capacitor electrodes.

16. The wobble disc variable capacitor of claim 15 wherein the two capacitor electrodes are located adjacent to each other.

17. The wobble disc variable capacitor of claim 15 wherein the two capacitor electrodes are spaced apart from each other on opposite sides of the central pivot.

18. The wobble disc variable capacitor of claim 14 wherein the rotor rotates about the central pivot with respect to the stator.

19. The wobble disc variable capacitor of claim 14 wherein the capacitor electrode is located radially inward of the drive elements.

20. The wobble disc variable capacitor of claim 14, further comprising at least one electrical component associated with one of the stator and the rotor for at least one of said drive elements.

21. The wobble disc capacitor of claim 20, wherein said electrical component is frequency determinative.

22. A wobble disc variable capacitor, comprising:

a substantially planar stator having a substrate with a central pivot;

an annular contact mounted on the substrate of the stator substantially concentric with the central pivot;

an annular array of drive elements mounted on the substrate of the stator substantially concentric between the central pivot and the contact;

at least one stationary capacitor electrode mounted to the substrate of the stator radially inward of the contact;

a circular, substantially planar, electrically conductive rotor mounted to the central pivot such that a center point of the rotor is axially spaced-apart from a center point of the stator, the rotor having an outer perimeter and being substantially concentric with the stator, the rotor also being tilted about the central pivot relative to the stator such that the perimeter is aligned and touches the contact at all times;

a hole in an underside of the rotor; and

wherein

in response to the activation of at least one drive element, the rotor is movable to a plurality of positions about the stator to define a gap between the rotor and the capacitor electrode to establish a variable capacitance value therewith for circuit application; and

wherein

an amount of overlap between the hole in the rotor and the capacitor electrode is manipulated by cycling the rotor between the positions to further vary the capacitive value therewith for circuit application.

23. The wobble disc variable capacitor of claim 22 wherein the hole is a pair of holes in an underside of the rotor.

24. The wobble disc variable capacitor of claim 23 wherein the pair of holes are spaced apart from each other on opposite sides of the central pivot.

25. The wobble disc capacitor of claim 22 wherein the rotor rotates about the central pivot with respect to the stator.

26. The wobble disc variable capacitor of claim 22 wherein the capacitor electrode is located radially inward of the drive elements.

27. The wobble disc variable capacitor of claim 22, further comprising at least one frequency determinative electrical component associated with one of the stator and the rotor for each of said drive elements.