Ungrounded Lossy Magnetic Shield for Connector EMR
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Solution Overview
Problem
Electrical connectors emit significant electromagnetic radiation (EMR) and radio frequency radiation (RFR), causing performance degradation and failure in electronic devices, and existing solutions like faraday cages are difficult to implement and require grounding points, leading to signal routing issues and increased RF noise emission.
Innovation Solution
A removable snap-on connector shield made of lossy magnetic material that does not require grounding points, using a combination of a shield portion with high magnetic loss properties and a support portion to secure the shield over the connector, effectively attenuating EMR without forming a faraday cage and interfering with signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a faraday cage is used to shield electromagnetic radiation from connectors, then EMR shielding is improved, but device complexity increases and grounding points are required causing signal routing issues
Solution Approach 1:
The patent changes the fundamental parameter of shielding mechanism from conductive grounding-based Faraday cage to magnetic loss-based absorption. The shield portion uses materials with high magnetic loss properties to attenuate EMR through magnetic hysteresis and eddy current losses, eliminating the need for grounding points and complex conductive structures.
Solution Approach 2:
The shield portion employs composite materials combining ferromagnetic particles (for magnetic loss) with conductive matrix material. This composite structure provides both magnetic shielding through hysteresis losses and electrical shielding through eddy current losses, achieving effective EMR attenuation without requiring traditional Faraday cage grounding infrastructure.
2Object-affected harmful factors
If grounding points are added to implement EMR shielding, then shielding effectiveness is improved, but signal routing problems and RF noise emission increase
Solution Approach 1:
The patent extracts and eliminates the grounding requirement from the shielding solution. By using magnetic loss materials, the shield achieves EMR attenuation without needing connection to ground planes, thereby removing the source of grounding-related RF noise and signal routing interference.
Solution Approach 2:
The patent converts the harmful effect of EMR into a beneficial shielding mechanism by utilizing magnetic hysteresis losses. The magnetic material absorbs and dissipates EMR energy through internal friction and eddy currents, transforming the problematic radiation into harmless heat within the shield material itself, without generating additional RF noise.
3Ease of operation
If a removable snap-on shield is used, then ease of installation is improved, but shielding effectiveness may be reduced compared to permanent solutions
Solution Approach 1:
The shield portion is pre-formed with an integrated snap-fit structure during manufacturing, allowing for tool-free installation. The elastic support portions are pre-configured to engage with the connector housing, enabling users to install the shield simply by snapping it into place without requiring additional tools or complex assembly procedures.
Solution Approach 2:
The shield portion employs curved and contoured surfaces that conform to the connector geometry, with snap-fit features designed with appropriate radii and compliance. This curvature allows the rigid shield portion to flex slightly during installation while maintaining intimate contact with the connector surface, ensuring effective shielding without compromising the removable nature of the design.
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 suppresses EMR and RFR without the need for grounding points, reducing interference and performance degradation in electronic devices, and can be applied at any stage of product development without modifying the board, making it suitable for various connector types.
Implementation Method 1
a shield portion (102), at least partially over the connector, to shield the electromagnetic radiation. In an embodiment, the shield portion can include lossy material.
Data Source
AI summary
Particular embodiments described herein provide for a connector shield that can include a main body, a shield portion to shield electromagnetic radiation from a connector, and a support portion. The main body can be removably secured to the connector. The shield portion includes lossy material and the shield portion is not grounded. The connector can include connection lines and the connection lines are at least partially inside a cavity of the shield portion.