Z-Directed PCB Components With Conductive Channels
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Solution Overview
Problem
High-frequency circuits face challenges with transmission line impedance discontinuities and electromagnetic interference (EMI) due to loop area, which existing Z-directed components have not adequately addressed, particularly in densely packed printed circuit boards (PCBs).
Innovation Solution
The development of Z-directed components with conductive channels and side channels that minimize transmission line impedance variations and reduce loop area by using conductive channels next to the signal path and strategically positioning side channels to control impedance and reduce EMI, incorporating materials with varying dielectric constants and configurations such as power-signal-ground or ground-signal-ground configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Z-directed components are used in high-frequency circuits, then component density is improved, but transmission line impedance discontinuities occur
Solution Approach 1:
The patent applies local quality by providing a conductive channel specifically adjacent to the signal path within the Z-directed component, while other portions of the component may have different structures. This localized conductive feature maintains consistent transmission line impedance at the critical signal path without requiring the entire component to be redesigned, thus resolving the impedance discontinuity problem while preserving high component density
2Productivity
If conventional Z-directed components are used in high-frequency circuits, then component density is improved, but electromagnetic interference (EMI) increases due to larger loop area
Solution Approach 1:
The patent converts the potentially harmful large loop area into a beneficial configuration by strategically positioning side channels and conductive features to minimize the effective current loop area. The side channels are positioned to provide return paths that are as close as possible to the signal path, transforming what would be a large EMI-generating loop into a compact controlled-impedance structure that reduces electromagnetic interference
3Reliability
If side channels are strategically positioned to control impedance, then transmission line impedance consistency is improved, but device complexity increases
Solution Approach 1:
The patent segments the Z-directed component into distinct functional regions: a signal path region with an adjacent conductive channel for impedance control, and side channel regions positioned at specific locations. This segmentation allows each region to be optimized for its specific function while maintaining overall manufacturing feasibility through standardized construction methods
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 approach allows for consistent transmission line impedance and reduced EMI, enhancing high-speed performance and minimizing unwanted signal interference in densely packed PCBs by controlling impedance and loop area effectively.
Implementation Method 1
conductive channels for controlling transmission line impedance
Implementation Method 2
incorporating materials with varying dielectric constants
Data Source
Figure 1~3F
Figure 4A~5H
Figure 6
AI summary
A Z-directed component for mounting in a mounting hole in a printed circuit board according to one example embodiment includes a body having a top surface, a bottom surface and a side surface. The body has a cross-sectional shape that is insertable into the mounting hole in the printed circuit board. A portion of the body is composed of an insulator. A first conductive channel extends through an interior portion of the body along the length of the body from the top surface to the bottom surface. The first conductive channel forms a signal path through the body. A second conductive channel and a third conductive channel each extends through the interior portion of the body along the length of the body. The second and third conductive channels are positioned next to and on opposite sides of the first conductive channel.