MEMS device with large out-of-plane actuation and low-resistance interconnect and methods of use
The present application is directed to a MEMS device. The MEMS device includes a substrate having a first end and a second end extending along a longitudinal axis, the substrate including an electrostatic actuator. The device also includes a movable plate having a first end and a second end. The device also includes a thermal actuator having a first end coupled to the first end of the substrate and a second end coupled to the first end of the plate. The actuator moves the plate in relation to the substrate. Further, the device includes a power source electrically coupled to the thermal actuator and the substrate. The application is also directed to a method for operating a MEMS device.
1. A MEMS device comprising:
a substrate having a first end and a second end extending along a longitudinal axis, the substrate including an electrostatic actuator;
a movable plate having a first end and a second end, the plate configured to move in relation to the substrate;
a thermal actuator having a first end coupled to the first end of the substrate and a second end coupled to the first end of the plate, the thermal actuator moving the plate in relation to the substrate; and
a power source electrically coupled to the thermal actuator and the substrate.
2. The device of claim 1 , further comprising:
a strap having a first end and a second end, the second end of the strap being coupled to the first end of the plate.
3. The device of claim 2 , wherein the strap and the plate are formed as a unitary structure.
4. The device of claim 2 , wherein the strap is separated from the thermal actuator by a predetermined distance perpendicular to the longitudinal axis.
5. The device of claim 2 , wherein the thermal actuator extends substantially parallel to the strap in the longitudinal axis.
6. The device of claim 5 wherein the predetermined distance is substantially uniform between the first and second ends of the thermal actuator and the strap.
7. The device of claim 1 , wherein the electrostatic actuator includes a transition metal selected from gold, chromium, platinum and combinations thereof.
8. The device of claim 1 , wherein the thermal actuator includes a bimorph.
9. The device of claim 2 , wherein the strap is positioned between two thermal actuators.
10. The device of claim 1 , further comprising:
a detector for measuring temperature change of the substrate or for measuring gap separation.
11. The device of claim 1 , further comprising:
one or more connectors extending from the first and second ends of the plate configured to couple the plate to one or more thermal actuators.
12. A radio product comprising the device of claim 1 .
13. A method for operating a MEMS device comprising:
providing a MEMS device including a substrate having an electrostatic actuator, movable plate, and a thermal actuator, the MEMs device positioned inside a resonator cavity, where the substrate is located within a recessed portion of a surface of the resonator cavity;
actuating the plate between a first position and a second position by applying electrical current to the thermal actuator; and
subsequently actuating the plate between the first position and the second position by applying electrical current to the substrate located within the recessed portion.
14. The method of claim 13 , wherein the plate moves up to 2 mm between the first position and the second position.
15. The method of claim 13 , wherein a first end of the substrate is connected to a second end of a strap.
16. The method of claim 15 , wherein the strap and the plate are formed as a unitary structure.
17. The method of claim 15 , wherein the strap is separated from the thermal actuator by a predetermined distance perpendicular to the longitudinal axis.
18. The method of claim 17 , wherein the predetermined distance is substantially uniform between the first and second ends of the thermal actuator and the strap.
19. The method of claim 15 , wherein
the thermal actuator extends substantially parallel to the strap in the longitudinal axis.
20. The method of claim 15 , wherein the strap is positioned between two thermal actuators.