Differential Pair Connector Layout for Accurate Impedance Matching
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Solution Overview
Problem
Existing connectors struggle to reliably match impedance between main and branch lines in communication circuits due to increased interval between differential pairs caused by locking lances, limiting the degree of freedom in setting impedance.
Innovation Solution
A connector design featuring a housing with terminal accommodation chambers arranged in two rows, shorting members forming a differential pair, and locking lances positioned only in regions different from the interval between the terminal accommodation chambers, allowing for a narrowed interval and enhanced impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking lances are arranged between two metal pieces when the metal pieces constitute a differential pair, then the male terminal and female terminal can be reliably connected, but the interval of the differential pair increases and impedance matching becomes difficult
Solution Approach 1:
The locking lances are repositioned from the space between differential pairs (lateral dimension) to the rear end region of the connector (depth dimension). This dimensional relocation allows locking lances to be strategically placed only at specific chambers (e.g., chambers 11a and 11d) without interfering with the interval between differential pairs, thus maintaining both connection reliability and impedance matching
Solution Approach 2:
Instead of uniformly distributing locking lances across all terminal accommodation chambers, the invention applies locking lances selectively only at specific chambers (e.g., first and fourth chambers in the second row) where they are most needed for reliable connection. This localized approach minimizes the impact on differential pair intervals while ensuring adequate locking at critical connection points
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 matches impedance within the connector and between the main and branch lines outside the connector, achieving high accuracy in impedance matching by narrowing the interval of the differential pair.
Implementation Method 1
The male terminal and the female terminal are held in a connected state only by friction resistance between the both terminals
Data Source
AI summary
A connector is provided with a housing including terminal accommodation chambers arranged in two rows, two shorting members to be mounted into a plurality of the terminal accommodation chambers arranged in one row and a plurality of the terminal accommodation chambers arranged in the other row and constituting a differential pair, a plurality of terminal fittings to be individually fixed to a main line constituting a differential pair and a branch line constituting a differential pair and connected to the shorting members by being inserted into the terminal accommodation chambers, and a plurality of locking lances formed in the housing and configured to retain the terminal fittings inserted into the terminal accommodation chambers. The locking lances are disposed only in regions different from a region between the plurality of terminal accommodation chambers arranged in the one row and the plurality of terminal accommodation chambers arranged in the other row.