Board-Mounted Shielded Connector Grounding Segmentation
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Solution Overview
Problem
Board-mounting type shield connectors experience degradation in frequency characteristics due to noise interference, particularly in noisy environments, as the ground pattern acts as a noise-receiving antenna, affecting high-frequency signals.
Innovation Solution
The shield connector design includes a ground member with both a first and second board connection portion to the circuit board, which reduces the length of the ground pattern acting as an antenna, shifting noise interference to higher frequencies and improving high-frequency characteristics by connecting the shield shell and mating connector to the ground pattern via these portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a ground pattern is spread on the board under the shield connector, then the shield connector can be mounted on the board, but the ground pattern acts as a noise-receiving antenna and degrades high frequency characteristics
Solution Approach 1:
The ground connection is segmented into multiple points: the first board connection portion connects the rear end of the shield shell to the ground pattern, while the second board connection portion connects the front end of the ground member to the ground pattern. This segmentation prevents the entire ground pattern from acting as a single noise-receiving antenna, thereby improving high frequency characteristics while maintaining board mounting capability
Solution Approach 2:
A ground member is introduced as an intermediary element between the shield shell and the ground pattern. This ground member with specific length and board connection portions acts as a mediator to control the electromagnetic field distribution, preventing the ground pattern from functioning as a noise-receiving antenna while maintaining proper grounding
2Adaptability or versatility
If the shield connector is placed in a noisy environment, then it can operate in motor vehicles and other applications, but noise affects the shield connector and degrades frequency characteristics
Solution Approach 1:
The shield shell and ground member are pre-configured with specific lengths and board connection portions that create a shielding effect before noise interference occurs. This preliminary anti-action structure prevents external noise from effectively coupling with the circuit board, allowing the connector to operate reliably in noisy environments like motor vehicles
Data Source
AI summary
A board-mounting type shield connector includes a contact, a housing supporting the contact and having a mating opening, a shield shell surrounding the housing and having a first board connection portion in a vicinity of a rear end portion of the shield shell, an enclosure having a plugging passage for plugging of a mating connector, and a ground member supported on the enclosure in a vicinity of a front end portion of the enclosure. The plugging passage opens in a frontward direction and communicates with the mating opening. The first board connection portion is connected to a ground pattern on a circuit board. The ground member has a second board connection portion connected to the ground pattern.