Vertical MEMS Switch Beam Segmentation for Compact Footprint
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Solution Overview
Problem
Existing vertical electromechanical switch devices face challenges in reducing footprint and improving connection reliability, with existing proposals still presenting additional connection problems.
Innovation Solution
The design features a vertical electromechanical device with a first and second electrode stack spaced apart by a gap, a third electrode stack with a beam extending down towards the substrate, and a connector portion that overlaps the first and second electrode stacks, allowing the beam to move and connect with either stack independently, with at least one electrode stack comprising a top electrode over a bottom electrode separated by an insulator, enabling independent control of resistance and actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If horizontal beam connector arrangement is used, then connection reliability is improved, but footprint area becomes very large
Solution Approach 1:
The patent transitions from a horizontal beam connector arrangement to a vertical arrangement, changing the spatial dimension of the switch device. The beam connector extends vertically from the substrate surface toward the electrodes, allowing the device to achieve high connection reliability while minimizing footprint area to approximately 12-18F^2 by utilizing the vertical dimension instead of horizontal spread.
2Area of stationary object
If vertical electrode and beam arrangement is used, then footprint area is reduced, but connection problems arise
Solution Approach 1:
The patent segments the vertical beam connector into distinct functional regions: a first portion extending from the substrate through an opening, and a second portion extending from the first electrode pattern to the first end of the first portion. This segmentation allows independent optimization of each segment's properties, ensuring reliable electrical connection while maintaining compact vertical geometry.
Solution Approach 2:
The patent introduces an insulating layer pattern that selectively covers portions of the beam connector and electrode patterns. This intermediary insulating structure prevents unwanted electrical contact in certain regions while allowing controlled connection in others, resolving the connection problems associated with vertical arrangements by providing spatially selective electrical isolation.
3Adaptability or versatility
If electrode stacks with insulators are used, then independent control of resistance and actuation is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functional elements into integrated electrode stacks, where control electrodes and bottom electrodes are stacked vertically with insulating layers between them. This merging of control and contact functions into compact vertical stacks enables independent control of resistance and actuation while minimizing the horizontal space required, effectively managing device complexity through three-dimensional integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances device operation and reliability, allowing for integration in dense grids suitable for memory, power, multiplexing, sensor, or actuation circuitry, with a reduced footprint as small as 12 or 18F^2, improving connection control and actuation efficiency.
Implementation Method 1
the beam is movable in a first direction so as to electrically connect with the first electrode stack or in a second direction so as to electrically connect with the second electrode stack
Data Source
Figure 1
Figure 2A~2B
Figure 3A1~3B3
AI summary
The invention relates to an electromechanical device (100) comprising: a first electrode stack (ST1) and a second electrode stack (ST2), both electrode stacks (ST1, ST2) extending in a vertical direction relative to a substrate (110) and being spaced apart by a gap (G); and a third electrode stack (S, B) comprising a beam (B) extending in a vertical direction in the electrode gap (G) and being spaced apart from the first electrode stack (ST1) by a first gap (G1), from the second electrode stack (ST2) by a second gap (G2), and from the substrate (110) by a third gap (G3); and a connector portion (S) overlapping the first and second electrode stacks (ST1, ST2), wherein, in operation, the beam (B) is movable in a first direction (A1) so as to electrically connect with the first electrode stack (ST1) or in a second direction (A2) so as to electrically connect with the second electrode stack (ST2), and, in a rest position, the beam (B) is isolated from the first and the second electrode stacks (ST1, ST2); wherein at least one of the electrode stacks (ST1, ST2) comprises two electrodes, a top electrode (EG1, EG2) stacked over a bottom electrode (ED1, ED2) and separated by an electrical insulator (L2). The invention also relates to a method for manufacturing an electromechanical device (100).