MEMS Sensor Conductive Cage for Stray Radiation Suppression
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Solution Overview
Problem
Existing shielding structures for MEMS sensors are inadequate in suppressing stray electromagnetic radiation, leading to insufficient signal-to-noise ratio, especially in sensitive Micro-ElectroMechanical System (MEMS) devices like sound transducers or microphones, due to insufficient reduction of electrical and electromagnetic interference.
Innovation Solution
A device comprising a MEMS sensor module enclosed by a conductive cage structure with integrated capacitive elements, which acts as a Faraday cage to suppress stray electromagnetic radiation and is thermally insulated to reduce thermal interference, using a capacitive element to shield connecting lines and prevent radiation penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional shielding structures are used, then device complexity is reduced, but electromagnetic shielding effectiveness deteriorates
Solution Approach 1:
The conductive cage structure is nested within the housing, creating a multi-layer shielding configuration where the cage encloses the MEMS sensor module. This nested arrangement provides enhanced electromagnetic shielding without requiring a complete redesign of the housing structure, effectively reducing harmful electromagnetic factors while maintaining reasonable device complexity.
Solution Approach 2:
The shielding solution combines conductive materials (for the cage structure) with capacitive elements (for filtering), creating a composite shielding system. This composite approach leverages the strengths of different materials and mechanisms to achieve superior electromagnetic shielding effectiveness compared to single-material solutions.
2Object-affected harmful factors
If conductive cage structure is added, then electromagnetic shielding effectiveness is improved, but thermal insulation performance deteriorates
Solution Approach 1:
The shielding system is segmented into distinct functional components: the conductive cage structure for electromagnetic shielding and the capacitive elements for both electromagnetic filtering and thermal management. This segmentation allows each component to be optimized for its specific function, enabling the cage to provide shielding while the capacitive elements help manage thermal interference.
Solution Approach 2:
The capacitive elements serve as intermediaries between the conductive cage structure and the MEMS sensor module. They provide electromagnetic filtering while also acting as thermal barriers, mediating the thermal interaction between the cage and the sensitive sensor, thus reducing thermal interference while maintaining shielding effectiveness.
3Object-affected harmful factors
If connecting lines are shielded with capacitive elements, then electrical interference reduction is improved, but device complexity increases
Solution Approach 1:
The capacitive elements are designed to serve multiple functions: they act as electromagnetic shields for the connecting lines, provide filtering for stray radiation, and contribute to the overall shielding effectiveness of the cage structure. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving improved electrical interference reduction.
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 solution effectively enhances the signal-to-noise ratio for MEMS sensors by reducing both electrical and thermal interference, improving the detection accuracy of ambient parameters while maintaining acoustic wave transmission with minimal attenuation.
Implementation Method 1
The conductive cage structure may enclose the MEMS sensor module in order to suppress penetration of stray electromagnetic radiation with a stray wavelength λo into the conductive cage structure
Implementation Method 2
The at least one connecting line may be connected to the MEMS sensor module and fed through the conductive cage structure by means of a capacitive element
Implementation Method 3
The conductive cage structure may be arranged thermally insulated from the MEMS sensor module
Data Source
AI summary
A device for suppressing stray radiation includes a Micro-ElectroMechanical System (MEMS) sensor module and a conductive cage structure. The conductive cage structure may enclose the MEMS sensor module in order to suppress penetration of stray electromagnetic radiation with a stray wavelength λo into the conductive cage structure, and the conductive cage structure may be arranged to be thermally insulated from the MEMS sensor module. The device may also include a connecting line. The connecting line may be connected to the MEMS sensor module and fed through the conductive cage structure by a capacitive element.