Circuit Board Plating Bar Dielectric Opening Signal Integrity
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Solution Overview
Problem
Conventional circuit boards with plating bars experience signal transmission issues due to open stub effects, leading to impedance mismatch and noise during high-frequency applications, which degrade signal quality and occupy valuable circuit layout space.
Innovation Solution
Incorporating openings in the dielectric layers adjacent to plating bars to reduce dielectric permittivity, thereby raising the resonance frequency and improving signal transmission quality by eliminating the need for the plating bars in the signal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plating bars are disposed on the circuit board for electrically connecting pads with cathode, then the electroplating process can be performed, but the layout for plating bars occupies available area for circuit layout and causes open stub effect leading to impedance mismatch and noise during high frequency signal transmission
Solution Approach 1:
The patent extracts the harmful function of the plating bar from the signal transmission path while preserving its necessary function for electroplating. The plating bar is designed to be electrically isolated from the signal transmitting structure, removing it as a source of impedance mismatch and noise during high-frequency operations.
Solution Approach 2:
The patent introduces an intermediary approach by using a dedicated plating bar configuration that serves as a mediator between the electroplating requirement and signal integrity. The plating bar is positioned and configured to facilitate plating without becoming part of the signal path, thus mediating between manufacturing needs and performance requirements.
2Adaptability or versatility
If plating bars are extended to the edge of the circuit board for electroplating, then the plating process can access all pads, but the redundant plating bars cause open stub effect that lowers signal transmitting quality
Solution Approach 1:
The patent segments the functions of the plating bar from the signal transmission function. The plating bar is configured to serve only the electroplating function while being electrically isolated from signal paths, effectively segmenting the harmful electromagnetic effects from the necessary manufacturing function.
Solution Approach 2:
The patent applies local quality by creating specific zones around the plating bar where signal transmission is separated from plating function. The plating bar is positioned and configured with specific electrical isolation characteristics in local areas to prevent harmful effects while maintaining plating accessibility.
3Ease of manufacture
If conventional circuit board layout is used with plating bars, then electroplating can be performed, but the signal transmitting path experiences impedance mismatch during high frequency applications
Solution Approach 1:
The patent extracts the plating bar from the signal transmission path, removing it as a source of impedance variation. This allows conventional plating processes to be used while eliminating the impedance mismatch problem that would otherwise require complex impedance control measures.
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 introduction of openings in the dielectric layers adjacent to plating bars enhances signal transmission by increasing the resonance frequency, reducing noise, and maintaining signal quality, while allowing for flexible design and reduced production costs.
Implementation Method 1
The dielectric layer has at least one opening adjacent to at least one side of the plating bar
Implementation Method 2
raising the resonance frequency and improving signal transmission quality
Data Source
AI summary
A circuit board includes a pad, a transmitting trace and a plating bar. The plating bar is used for forming an electroplating metallic layer on the pad, the pad and the transmitting trace are used for the signal transmission. Due to the plating bar causes a noise during the signal transmission, a dielectric layer having at least one opening is adjacent to at least one side of the plating bar to reduce the equivalent dielectric permittivity thereof and to maintain signal transmitting quality.