Multipolar Connector Row Conversion Impedance Matching
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Solution Overview
Problem
Conventional multipolar connectors face limitations in miniaturization and terminal increase due to pitch constraints of through holes, leading to impedance mismatch issues when dividing terminal rows for high-speed differential signal transmission.
Innovation Solution
The multipolar connector divides one terminal row into multiple rows with specific terminals having wider widths in the plural-row portion to match impedance, reducing impedance mismatch by increasing capacitance and resistance, allowing for efficient high-frequency transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If one terminal row is divided into two rows to reduce terminal pitch and enable miniaturization, then the terminal pitch can be further reduced and terminal number increased, but the gap in terminal pairs increases and electrical coupling state is impaired causing impedance mismatch
Solution Approach 1:
The patent applies local quality by differentiating terminal structures into two types: ordinary terminals with uniform width and specific terminals with widened portions. The specific terminals are strategically positioned at locations where row conversion occurs (dividing one terminal row into two). This local structural modification increases capacitance at critical points, compensating for the increased gap distance caused by row division, thereby maintaining electrical coupling state and reducing impedance mismatch while enabling reduced terminal pitch overall.
Solution Approach 2:
The patent changes the geometric parameter of terminal width at specific locations. By widening the terminal width of specific terminals in the plural-row portion compared to the contact portion, the capacitance is increased. This parameter change compensates for the increased distance between terminals in divided pairs, maintaining impedance matching despite the row conversion that reduces overall terminal pitch.
2Reliability
If terminal width is increased in plural-row portion to maintain impedance matching, then capacitance increases and impedance mismatch reduces, but terminal size increases
Solution Approach 1:
Instead of uniformly increasing all terminal dimensions, the patent applies local quality by widening only specific terminals at critical locations where row conversion occurs. This localized width increase minimizes the overall terminal area growth while concentrating the capacitance enhancement exactly where needed to maintain impedance matching in divided terminal pairs.
Solution Approach 2:
The patent segments the terminal group into ordinary terminals and specific terminals with different width characteristics. This segmentation allows the system to achieve impedance matching through targeted modifications rather than global dimensional increases, thereby reducing the overall terminal area increase while maintaining reliability.
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
This configuration enables effective miniaturization and terminal increase while maintaining efficient high-speed signal transmission by reducing impedance mismatch and achieving impedance matching.
Implementation Method 1
the capacitance is increased by increasing the terminal widths of the specific terminals in the plural-row portion
Data Source
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AI summary
The invention provides a multipolar connector in which one terminal row can be divided into a plurality of rows (row conversion) while reducing an impedance mismatch. A multipolar connector (1) which is to be insert-mounted on a printed circuit board (100) includes a terminal group (40) in which a plurality of terminals (4) are arranged in one row in contact portions (4a) with respect to terminals of a counter connector, and, while being then passed through a row converting portion (45), one terminal row (41) is divided into a plural-row portion (44) consisting of two rows (42, 43) and functioning as a connecting portion that is opposite to the counter connector, and row-converted to a substantially zigzag arrangement. The terminal group (40) includes two specific terminals (46, 47) in which, in the plural-row portion (44), the terminal width (L1) is wider than the terminal width (L2) of the contact portions (4a). The two specific terminals (46, 47) constitute a terminal pair for transmitting differential signals.