Shielding Gasket for Electrical Connector EMI Leakage
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Solution Overview
Problem
Board-mounted electrical connectors often have gaps in electrical shielding due to elevated ground pads and lifted outer conductors, which compromise the integrity of the shielding interface.
Innovation Solution
A coaxial electrical connector design featuring a separate shielding gasket and a biasing spring to ensure perimeter shielding around the inner conductor, with compressible components to maintain contact and fill gaps between the outer conductor and the board interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the outer conductor is mounted directly to the board interface, then the structure is simple, but gaps form in the electrical shielding due to lifted outer conductors and elevated ground pads
Solution Approach 1:
A shielding gasket is introduced as an intermediary component between the outer conductor and the board interface. The gasket fills gaps and ensures continuous electrical shielding by conforming to the board surface and maintaining contact with the outer conductor, preventing EMI leakage while preserving structural simplicity.
Solution Approach 2:
The shielding gasket is implemented as a flexible, compressible component that can deform to fill irregular gaps between the rigid outer conductor and the board interface. This flexibility ensures continuous shielding coverage even when ground pads are elevated or the board surface is uneven, resolving the contradiction between simple structure and reliable shielding.
2Ease of manufacture
If ground pads are elevated to accommodate protrusions, then manufacturing is easier, but gaps form in the shielding interface
Solution Approach 1:
The compressible shielding gasket deforms to bridge gaps created by elevated ground pads, maintaining continuous shielding coverage without requiring changes to the ground pad fabrication process. This allows easy manufacturing while preserving shielding integrity.
Solution Approach 2:
The shielding gasket is designed to compress and fill potential gaps before final assembly, proactively compensating for manufacturing tolerances and elevated ground pads. This beforehand cushioning ensures shielding continuity is maintained despite variations in ground pad height.
3Stability of the object's composition
If the outer conductor is rigidly fixed, then structural stability is high, but gaps remain due to inability to conform to board interface variations
Solution Approach 1:
The shielding gasket serves as a mediator between the rigid outer conductor and the variable board interface. It absorbs positioning variations and maintains continuous contact, ensuring both structural stability of the outer conductor and reliable shielding interface contact.
Solution Approach 2:
The flexible, compressible nature of the shielding gasket allows it to conform to board interface variations while the outer conductor remains rigidly positioned. This combination maintains both structural stability and shielding reliability by decoupling the rigidity requirement from the conformance requirement.
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 provides complete and effective electrical shielding, preventing EMI leakage and ensuring reliable connectivity by compressing the shielding gasket between the connector and the circuit board, thereby enhancing the mating interface and reducing gaps in the shielding.
Implementation Method 1
A biasing spring is coupled to the outer conductor to bias the first mating end away from the second mating end
Data Source
AI summary
A electrical connector includes an inner conductor having a first mating end configured to be coupled to an electrical component and a second mating end and an outer conductor having a first mating end configured to be coupled to the electrical component and a second mating end. The outer conductor has a bore receiving the inner conductor. The inner conductor is coaxial with the outer conductor. A shielding gasket is separate and discrete from the outer conductor and coupled to the first mating end of the outer conductor. The shielding gasket has an outer surface facing the electrical component and configured to interface with the electrical component. The shielding gasket provides perimeter shielding around the first mating end of the inner conductor.