MEMS Switch Segmented Electrodes Symmetric Actuation
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Solution Overview
Problem
Existing MEMS switches face challenges with elongated RF electrodes causing unwanted series resistance and the need for multiple switches to implement complex switching functionality, while also having limitations in actuation voltage range and contact force.
Innovation Solution
A MEMS switch design featuring multiple signal lines with a single movable electrode and segmented actuation electrodes, allowing for symmetric actuation force and versatile switch functions, including n-pole m-throw capabilities, without requiring elongated signal lines or electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elongated RF electrodes are used to connect signal lines, then the switch can make contact between signal lines, but unwanted series resistance increases
Solution Approach 1:
The movable contact electrode is segmented into multiple independent contact regions (first contact region, second contact region, third contact region) that can independently contact different signal lines. This segmentation eliminates the need for elongated continuous electrodes, reducing series resistance while maintaining switching capability between multiple signal lines.
2Adaptability or versatility
If multiple switches are used to implement complex switching functionality, then switching versatility is achieved, but device complexity increases
Solution Approach 1:
A single movable contact electrode with multiple contact regions can perform multiple switching functions by selectively contacting different signal lines (first signal line, second signal line, third signal line). This multi-functional design eliminates the need for multiple separate switches, reducing device complexity while maintaining switching versatility.
Solution Approach 2:
The patent combines multiple switching functions into a single integrated device by merging the contact regions and actuation mechanisms. The movable contact electrode integrates first, second, and third contact regions that can independently switch between different signal line pairs, consolidating what would traditionally require multiple separate switches.
3Force
If actuation voltage is increased to achieve higher contact force, then contact force improves, but actuation voltage range decreases
Solution Approach 1:
The segmented movable contact electrode with multiple independent contact regions allows for more efficient force distribution. Each contact region can be actuated with optimized voltage, achieving high contact force without requiring excessively high overall actuation voltage, thus preserving the actuation voltage range.
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
The design achieves a lower actuation voltage, increased working range, and higher maximum contact force while maintaining symmetric deformation, enhancing the switch's versatility and performance compared to conventional designs.
Implementation Method 1
The movable element is movable towards the substrate between a first and a second position by application of an actuation voltage, providing electrostatic attraction
Implementation Method 2
An alternative type uses piezoelectric actuation, in which drive signals cause deformation of a piezoelectric beam
Data Source
AI summary
A MEMS switch in which at least first, second and third signal lines are provided over the substrate, which each terminate at a connection region. A lower actuation electrode arrangement is over the substrate. A movable contact electrode is suspended over the connection regions for making or breaking electrical contact between at least two of the three connection regions and an upper actuation electrode provided over the lower actuation electrode. The use of three of more signal lines enables a symmetrical actuation force to be achieved or enables multiple switch functions to be implemented by the single movable electrode, or both.