MEMS Microphone Dual Electromagnetic Shielding

The patent implements a nested shielding structure where an inner electromagnetic shielding can is placed inside an outer electromagnetic shielding can. The inner can shields the MEMS microphone diaphragm and associated circuitry, while the outer can provides additional shielding layers. This multi-layer nested configuration creates progressively better electromagnetic isolation while maintaining the compact form factor required for portable devices.

The electromagnetic shielding cans act as intermediary structures between the MEMS microphone and the external electromagnetic environment. These shielding cans, made of conductive materials and connected to ground, serve as mediators that intercept and redirect electromagnetic waves away from the sensitive microphone components, thereby protecting the small lightweight device without requiring significant size increase.

The patent combines the electromagnetic shielding function with the structural housing of the MEMS microphone module. The shielding cans are integrated into the existing device architecture, serving dual purposes as both protective structures and electromagnetic barriers. This merging approach provides comprehensive shielding against electromagnetic interference while avoiding the need for separate, additional shielding components that would increase overall device complexity.

The patent optimizes the shielding effectiveness by adjusting parameters such as the thickness, material composition, and grounding configuration of the shielding cans. By carefully controlling these parameters, the design achieves high sound reception quality and electromagnetic protection without requiring overly complex structures. The inner and outer cans use different grounding arrangements (inner can grounded at one end, outer can at both ends) to maximize shielding efficiency with minimal structural complexity.