Metal contact RF MEMS single pole double throw latching switch
First Claim
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1. A switch comprisinga substrate;
- a first substrate bias electrode disposed on the substrate;
a second substrate bias electrode disposed on the substrate; and
a cantilever structure comprising;
a cantilever anchor disposed on the substrate;
a first cantilever arm projecting from the cantilever anchor and over the first substrate bias electrode, wherein the first cantilever arm has a first armature electrode layer;
a second cantilever arm projecting from the cantilever anchor and over the second substrate bias electrode, wherein the second cantilever arm hits a second armature electrode layer,wherein the first cantilever arm has at least one first cantilever arm structure adapted to mechanically hold the first cantilever arm against the first substrate bias electrode after a first voltage or current is applied to the first substrate bias electrode and/or the second cantilever arm has at least one second cantilever arm structure adapted to mechanically hold the second cantilever arm against the second substrate bias electrode after a second voltage or current is applied to the second substrate bias electrode.
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Abstract
Apparatus for a micro-electro-mechanical switch that provides single pole, double throw switching action. The switch has two input lines and two output lines. The switch has a seesaw cantilever arm with contacts at each end that electrically connect the input lines with the output lines. The cantilever arm is latched into position by frictional forces between structures on the cantilever arm and structures on the substrate in which the cantilever arm is disposed. The state of the switch is changed by applying an electrostatic force at one end of the cantilever arm to overcome the mechanical force holding the other end of the cantilever arm in place.
23 Citations
18 Claims
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1. A switch comprising
a substrate; -
a first substrate bias electrode disposed on the substrate; a second substrate bias electrode disposed on the substrate; and a cantilever structure comprising; a cantilever anchor disposed on the substrate; a first cantilever arm projecting from the cantilever anchor and over the first substrate bias electrode, wherein the first cantilever arm has a first armature electrode layer; a second cantilever arm projecting from the cantilever anchor and over the second substrate bias electrode, wherein the second cantilever arm hits a second armature electrode layer, wherein the first cantilever arm has at least one first cantilever arm structure adapted to mechanically hold the first cantilever arm against the first substrate bias electrode after a first voltage or current is applied to the first substrate bias electrode and/or the second cantilever arm has at least one second cantilever arm structure adapted to mechanically hold the second cantilever arm against the second substrate bias electrode after a second voltage or current is applied to the second substrate bias electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
wherein the armature electrode layer is disposed between the first beam structural layer and the second beam structural layer.
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7. The switch according to claim 6, wherein the first beam structural layer and/or the second beam structural layer comprise silicon nitride.
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8. A method of single pole double throw switching comprising:
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providing a seesaw cantilever structure on a substrate, the seesaw cantilever structure being disposed above the substrate and said seesaw cantilever structure comprising; a beam structural layer having a first end and a second end; an armature electrode layer disposed above said beam structural layer; a first contact disposed at or near the first end of the beam structural layer and electrically isolated from the arm electrode layer; a second contact disposed at or near the second end of the beam structural layer and electrically isolated from the arm electrode layer a flexible portion anchoring the beam structural layer to the substrate at or around a midpoint of the beam structural layer, selectably applying a first voltage or current to a first substrate electrode or a second voltage or current to a second substrate electrode, wherein the first substrate electrode is disposed beneath the seesaw cantilever structure at a point between the midpoint and the first end of the beam structural layer and the second substrate electrode is disposed beneath the seesaw cantilever structure at a point between the midpoint and the second end of the beam structural layer, wherein when the first voltage or current is selectably applied, the method comprises; attracting the first end of the beam structural layer towards the substrate; and mechanically holding the beam structural layer on the first substrate electrode with one or more structures disposed on the beam structural layer providing an electrical contact between a first input line and a first output line with the first contact, and wherein when the second voltage or current is selectably applied, the method comprises; attracting the second end of the beam structural layer towards the substrate; and mechanically holding the beam structural layer on the second substrate electrode with one or more structures disposed on the beam structural layer; and providing an electrical contact between a second input line and a second output line with the second contact. - View Dependent Claims (9, 10, 11, 12)
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13. A switch comprising:
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a substrate; a seesaw cantilever structure having a first end and a second end; means for attracting a first end of the seesaw cantilever structure towards the substrate; means for mechanically holding the first end of the seesaw cantilever structure on the substrate; means for attracting a second end of the seesaw cantilever structure towards the substrate; and
,means for mechanically holding the second end of the seesaw cantilever structure on the substrate. - View Dependent Claims (14, 15, 16, 17)
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18. A switch comprising:
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a substrate; a seesaw cantilever structure having a first end and a second end; means for attracting a first end of the seesaw cantilever structure towards the substrate; means for mechanically holding the first end of the seesaw cantilever structure on or above the substrate; means for attracting a second end of the seesaw cantilever structure towards the substrate; and
,means for mechanically holding the second end of the seesaw cantilever structure on or above the substrate, wherein the means for attracting a first end of the seesaw cantilever structure comprises means for providing a first electrostatic attractive force between the substrate and the first end of the seesaw cantilever structure and the means for attracting a second end of the seesaw cantilever structure comprises means for providing a second electrostatic attractive force between the substrate and the second end of the seesaw cantilever structure, and wherein the means for providing a first electrostatic attractive force comprises; a first bias substrate electrode disposed on the substrate; and a first armature electrode layer disposed in the seesaw cantilever structure, and the means for providing a second electrostatic attractive force comprises; a second bias substrate electrode disposed on the substrate; and a second armature electrode layer disposed in the seesaw cantilever structure, and wherein the means for mechanically holding the first end of the seesaw cantilever structure comprises a first recess disposed at or near the first end of the seesaw cantilever structure, wherein the first recess fits around at least a portion of an outer perimeter of the first bias substrate electrode, and the means for mechanically holding the second end of the seesaw cantilever structure comprises a second recess disposed at or near the second end of the seesaw cantilever structure, wherein the second recess fits around at least a portion of an outer perimeter of the second bias substrate electrode.
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Specification