Substrate Connector Terminal Layout for Stable High-Frequency Impedance
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Solution Overview
Problem
Existing substrate connectors face challenges in impedance matching, particularly during high-frequency transmission, due to design features that increase impedance fluctuations.
Innovation Solution
The substrate connector design includes a terminal with a bridge portion that features a first extending portion loosely fitted into an insertion hole, eliminating the need for a wide portion with press-fit projections. This configuration reduces impedance fluctuations and facilitates easier impedance matching for high-frequency transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wide portion with press-fit projection portions is provided in the first extending portion, then the terminal can be firmly fixed to the housing, but the impedance decreases and impedance matching becomes difficult
Solution Approach 1:
The patent divides the fixing function and the impedance control function into separate parts: the second extending portion provides fixing strength through press-fit projection portions, while the first extending portion maintains proper impedance without wide portions or projection portions. This segmentation resolves the contradiction by allowing each part to optimize for its specific function.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the terminal: the first extending portion has a uniform cross-section without wide portions to maintain impedance, while the second extending portion has press-fit projection portions for fixing. This local differentiation resolves the contradiction by giving each region the quality it needs for its specific purpose.
2Reliability
If the first extending portion is press-fitted into the insertion hole, then the terminal is securely fixed, but the impedance fluctuates due to the need for wide portions and projection portions
Solution Approach 1:
The patent segments the fixing function to the second extending portion only, while the first extending portion is loosely fitted to maintain impedance consistency. This segmentation allows the first extending portion to provide stable impedance for high-frequency signals while the second extending portion provides secure fixing.
Solution Approach 2:
Instead of press-fitting the first extending portion as in conventional designs, the patent inverts the approach by loosely fitting it and providing press-fit projection portions in the second extending portion instead. This inversion resolves the contradiction by eliminating impedance-fluctuating features from the signal transmission path while maintaining fixing reliability elsewhere.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A substrate connector (1) includes a terminal (2) and an inner housing (3). The terminal (2) includes a first connecting portion (21) extending in a first direction (X1), a second connecting portion (22) extending in a second direction (X2), and a bridge portion (60). The bridge portion (60) includes a first extending portion (61) extending in the first direction (X1) from the first connecting portion (21), a second extending portion (62) extending in the second direction (X2) from the second connecting portion (22), and a curved portion (63) connecting the first extending portion (61) and the second extending portion (62). The second extending portion (62) includes a pair of press-fit protrusions (65) protruding in directions opposite to each other in the third direction. The second extending portion (62) and the curved portion (63) are accommodated in an accommodation groove (34) provided in an end surface (33) of the inner housing (3) in the first direction (X1). A pair of press-fit protrusions (65) are press-fitted and fixed in a pair of inner side surfaces (34a) of the accommodation groove (34). The first extending portion (61) is loosely fitted to the inner peripheral surface of the insertion hole (35) that opens in the groove bottom surface (34b) of the accommodation groove (34) .