Use of micro-structured plate for controlling capacitance of mechanical capacitor switches
First Claim
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1. A capacitance switch comprisinga first plate including a magnet,a second plate, anda plurality of micro-posts extending from the first plate and having uniform dimensions,the plurality of micro-posts having a dielectric coating deposited thereon,wherein during an “
- off”
state the plurality of micro-posts are in spaced relation with the second plate, andwherein radio frequency power is transmitted between the first and second plates through the plurality of micro-posts when in an “
on state”
, and wherein during the “
on”
state the plurality of micro-posts contact the second plate creating a homogeneous capacitive contact with the second plate across the plurality of micro-posts and capacitively coupling the first plate with the second plate,wherein a capacitive value of the homogeneous capacitive contact is a function of the number of individual micro-posts in contact with the second plate.
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Abstract
Micro capacitive switches and methods of manufacturing micro capacitive switches at variable nominal capacitance value using micro-structures on the contact plates of the same dimension. In a preferred embodiment, a separately manufactured contact plate can be mounted to a movable magnet in order to be actuated to “on” and “off” state of the capacitive switch. Depending on the contact plate'"'"'s surface condition, variable contact capacitance at “on” state can be precisely specified by geometrical properties of the micro-structures on the surface, such as the density, size and depth.
27 Citations
17 Claims
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1. A capacitance switch comprising
a first plate including a magnet, a second plate, and a plurality of micro-posts extending from the first plate and having uniform dimensions, the plurality of micro-posts having a dielectric coating deposited thereon, wherein during an “ - off”
state the plurality of micro-posts are in spaced relation with the second plate, andwherein radio frequency power is transmitted between the first and second plates through the plurality of micro-posts when in an “
on state”
, and wherein during the “
on”
state the plurality of micro-posts contact the second plate creating a homogeneous capacitive contact with the second plate across the plurality of micro-posts and capacitively coupling the first plate with the second plate,wherein a capacitive value of the homogeneous capacitive contact is a function of the number of individual micro-posts in contact with the second plate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- off”
-
8. A capacitance switch comprising
a first plate including a magnet, a second plate, and a plurality of micro-posts extending from the first plate and having uniform dimensions, the plurality of micro-posts having a dielectric coating deposited thereon, wherein during an “ - off”
state the plurality of micro-posts are in spaced relation with the second plate, and wherein radio frequency power is transmitted between the first and second plates through the plurality of micro-posts when in an “
on state”
, and wherein during the and during an “
on”
state the plurality of micro-posts contact the second plate creating a homogeneous capacitive contact with the second plate across the plurality of micro-posts and capacitively coupling the first plate with the second plate, wherein a capacitive value of the homogeneous capacitive contact is a function of a periodic pattern of the plurality of micro-posts.
- off”
-
9. A micro-post capacitance switch comprising
a top plate including a magnet, a plurality of micro-posts coupled to the top plate and having uniform dimensions, the plurality of micro-posts having a dielectric coating deposited thereon, and a pair of parallel bottom plates, the bottom plates being laterally spaced from one another, wherein radio frequency power is transmitted between the top and bottom plates through the plurality of micro-posts when in an “ - on”
state, wherein the plurality of micro-posts capacitively and homogeneously couple the top and bottom plates in the “
on”
state, wherein during an “
off”
state the plurality of micro-posts are in spaced relation with the bottom plates. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- on”
-
17. A micro-post capacitance switch comprising
a top plate including a magnet, a plurality of micro-posts coupled to the top plate and having uniform dimensions, the plurality of micro-posts having a dielectric coating deposited thereon, and a pair of parallel bottom plates, the bottom plates being laterally spaced from one another, wherein radio frequency power is transmitted between the top and bottom plates through the plurality of micro-posts when in an “ - on”
state, wherein the plurality of micro-posts capacitively and homogeneously couple the top and bottom plates in the “
on”
state, wherein during an “
off”
state the plurality of micro-posts are in spaced relation with the bottom plates, and wherein the capacitance of the capacitive coupling has a value that is a function of a periodic pattern of the plurality of micro-posts.
- on”
Specification
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Current AssigneeRegents of the University of California (University of California)
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Original AssigneeRegents of the University of California (University of California)
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InventorsBachman, Mark, Li, Guann-Pyng, Zhang, Yang, Chang, Ruisheng, Wang, Minfeng, Kim, Sungjun
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Primary Examiner(s)Ismail, Shawki S
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Assistant Examiner(s)HOMZA, LISA NHUNG
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Application NumberUS13/444,753Publication NumberTime in Patent Office1,847 DaysField of Search335 78US Class CurrentCPC Class CodesH03K 17/975 using a capacitive movable ...
