MEMS Hybrid Wiring System for mm-Wave Signal Loss Reduction
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Solution Overview
Problem
Current MEMS-switches face challenges with high electrical losses and limited robustness due to radiation into silicon substrates in mm-wave frequency ranges, particularly with micro-strip line concepts, and signal reflection issues with coplanar waveguide concepts during in-plane actuation.
Innovation Solution
A hybrid wiring system combining micro-strip line and coplanar waveguide concepts along different longitudinal portions of a signal line, where the contact material forms a defined distance between layers, reducing electric losses and enhancing robustness by optimizing signal line configurations and actuation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a micro-strip line concept with ground plane inserted beyond the signal line is used, then the signal line can be connected with fixed contact elements, but radiation loss into the silicon substrate increases in the mm-wave frequency range
Solution Approach 1:
The patent transitions from a two-dimensional micro-strip line configuration to a three-dimensional waveguide structure by creating a enclosed or partially enclosed signal path between top and bottom layers, effectively adding a vertical dimension to confine electromagnetic fields and prevent substrate radiation
Solution Approach 2:
The patent applies different structural configurations to different portions of the signal line - using waveguide structures in regions prone to radiation and transitioning to other configurations where appropriate, optimizing performance for specific functional requirements
2Loss of energy
If a coplanar waveguide concept is used to reduce radiation loss, then electric field penetration into substrate is reduced, but signal reflection and insertion loss increase during in-plane actuation
Solution Approach 1:
The patent divides the signal line into multiple segments with different configurations - using coplanar waveguide portions where radiation protection is needed while incorporating transition sections and alternative structures in actuation regions to minimize signal reflection and insertion loss
Solution Approach 2:
The patent designs the signal line structure to adapt to the actuation state, using movable elements and reconfigurable connections that maintain optimal signal characteristics during in-plane actuation while preserving radiation shielding when static
3Loss of energy
If the thickness of the dielectric layer is increased to separate ground plane and signal line, then radiation loss is reduced, but layer stress increases and fabrication becomes more complicated
Solution Approach 1:
Instead of increasing dielectric layer thickness in the vertical direction, the patent uses three-dimensional waveguide structures that achieve radiation shielding through lateral confinement and enclosed geometries, maintaining standard layer thicknesses and simplifying fabrication
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 hybrid system achieves low electrical losses and high efficiency with reduced signal reflection, enabling robust and efficient switching of high-frequency signals while maintaining mechanical integrity and low actuation voltage.
Implementation Method 1
The contact material forms a distance between the sides of the first and the second layer
Implementation Method 2
allowing for an application of an electrostatic force between the electrodes 122 and 124 such that the movable electrodes 124 are moved towards the static electrodes 122
Implementation Method 3
The micro-actuator 120 comprises a restoring spring 132 configured for restoring a situation of the contact electrodes 112a and 112b when the electrostatic force between the electrodes 122 and 124 is reduced or removed
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A MEMS comprises a stack comprising a first layer and a second layer having sides facing each other. The first layer and the second layer are attached to each other by a contact material at opposing contact regions of the sides of the first and the second layer. The contact material forms a distance between the sides of the first and the second layer. A first signal line is arranged at the side of the first layer. A second signal line is arranged at the side of the second layer. The first signal line, at a first longitudinal portion of the first signal line, laterally extends through the contact region of the first side of the first layer. The second signal line comprises a void in a void region at a location in the corresponding contact region of the side of the second layer and opposing the first signal line, The first signal line, at a second longitudinal portion of the first signal line, faces the second signal line spaced apart from the second signal line.