Connection Plate Impedance Control via Ground Part Spacing
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Solution Overview
Problem
Conventional connection plates in multilayer printed circuit board architectures face challenges in controlling characteristic impedance, leading to discontinuous signal transmission and significant insertion loss, especially for radio frequency signals, making it difficult to debug and converge Smith charts.
Innovation Solution
A connection plate design with a signal transmission part and a ground part, where the ground part surrounds the signal transmission part and has a controlled radius to adjust characteristic impedance, ensuring continuity and reducing insertion loss by shielding signal radiation, with the ground holes and signal transmission holes sharing the same extension path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional connection plate structure is used to connect two printed circuit boards, then the structure is simple and easy to manufacture, but the characteristic impedance of the wire cannot be controlled, resulting in discontinuous signal transmission and great insertion loss
Solution Approach 1:
The connection plate structure is optimized locally by adding ground holes surrounding the signal transmission hole and adjusting their spacing. This local structural enhancement enables precise characteristic impedance control without requiring complete redesign of the entire connection plate, thus resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The characteristic impedance is controlled by adjusting physical parameters of the connection plate structure, specifically the spacing between the signal transmission hole and ground holes, and the radius of the ground holes. By changing these parameters, the desired impedance control is achieved while maintaining a relatively simple overall structure.
2Reliability
If the ground part surrounds the signal transmission part with controlled spacing, then the characteristic impedance can be precisely controlled and signal continuity improved, but the manufacturing process becomes more complex
Solution Approach 1:
The connection plate is segmented into distinct functional regions: signal transmission holes for RF signals and surrounding ground holes for impedance reference and shielding. This segmentation allows each region to be optimized independently while maintaining overall manufacturing feasibility through standardized hole patterns.
Solution Approach 2:
The ground holes are nested around the signal transmission hole in a concentric arrangement. This nested structure efficiently utilizes space, provides effective electromagnetic shielding, and maintains controlled impedance without requiring excessive manufacturing complexity, as the pattern can be implemented through standard drilling and plating processes.
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 design allows for precise control of characteristic impedance, reducing insertion loss and improving signal continuity, while also shielding radiation, resulting in better matching performance and overall signal quality.
Implementation Method 1
the ground part can be connected to ground of each of the two circuit boards, to implement continuity of grounding between each of the two circuit boards and the connection plate... the ground part surrounds the signal transmission part and is disposed with a spacing between the ground part and the signal transmission part... the ground part can further shield signal radiation
Data Source
AI summary
An circuit board assembly includes a first circuit board, a second circuit board stacked with the first circuit board, and a connection plate connected between the first circuit board and the second circuit board. The connection plate includes a signal transmission part and at least one ground part at a spacing to the signal transmission part. The ground part can be used as a reference ground for a signal transmitted by the signal transmission part, so that the characteristic impedance of the signal transmission part is controllable, and the signal transmitted by the signal transmission part has strong continuity, thereby maintaining good matching performance and reducing an insertion loss caused by characteristic impedance mismatch.