Connector Housing Shield Structure for Leakage EM Wave Attenuation
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Solution Overview
Problem
Existing electronic control devices with shield cases fail to effectively suppress leakage electromagnetic waves between the circuit substrate and connector, leading to radiation of these waves outside the device.
Innovation Solution
An electronic control device design featuring a circuit substrate with signal and ground wiring, a connector with signal and ground conductors, and a housing with a leakage electromagnetic wave attenuating structure comprising conductors arrayed along the propagation path to attenuate leakage electromagnetic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield case structure is used to provide electromagnetic shielding, then shielding effect is improved, but leakage electromagnetic waves still propagate through the space between connector and housing
Solution Approach 1:
The patent divides the continuous space between the connector and housing into multiple segmented regions by inserting a ground electrode array. This segmentation creates multiple small gaps instead of one large continuous space, preventing the formation of an effective waveguide path for leakage electromagnetic waves.
Solution Approach 2:
The patent introduces a ground electrode array as an intermediary structure between the connector and housing. These ground electrodes act as a mediator that intercepts and redirects leakage electromagnetic waves to ground, preventing them from propagating through the housing opening.
2Object-affected harmful factors
If the space between housing and connector is reduced to suppress waveguide effect, then electromagnetic compatibility is improved, but manufacturing and assembly become more difficult
Solution Approach 1:
Instead of requiring a uniformly small gap between housing and connector, the patent segments this space using ground electrodes. This allows larger overall spacing while maintaining electromagnetic compatibility, significantly easing manufacturing and assembly requirements.
3Object-affected harmful factors
If a leakage electromagnetic wave attenuating structure is added between housing and connector, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent uses thin ground electrode structures that can be flexibly positioned and connected to ground. These thin-film-like ground electrodes provide effective electromagnetic attenuation while adding minimal structural complexity and maintaining design flexibility.
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 leakage electromagnetic waves between the housing and connector, reducing radiation and improving the device's electromagnetic compatibility.
Implementation Method 1
a plurality of conductors that are arrayed along a direction in which the leakage electromagnetic wave propagates from the one end of the at least one connector, and attenuate the leakage electromagnetic wave propagating through the radio wave path
Data Source
AI summary
An electronic control device including a circuit substrate having a signal wiring and a ground wiring; at least one connector having a signal conductor and a ground conductor respectively connected to the signal wiring and the ground wiring of the circuit substrate on one end side and extending on the other end side; a housing including an accommodating portion that accommodates the circuit substrate and the at least one connector, in which a radio wave path through which a leakage electromagnetic wave propagates from one end on the circuit substrate side toward the other end on the side opposite to the circuit substrate side of the at least one connector is formed in an internal space at the periphery of the at least one connector; and a leakage electromagnetic wave attenuating structure provided between the housing and the at least one connector; where the leakage electromagnetic wave attenuating structure includes a plurality of conductors that are arrayed along a direction in which the leakage electromagnetic wave propagates from the one end of the at least one connector, and attenuate the leakage electromagnetic wave propagating through the radio wave path.