Laminated Transmission Line Layout for Stable Mounting Electrode Flatness
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Solution Overview
Problem
Conventional signal transmission lines face issues with maintaining the flatness of mounting electrodes, which can lead to deviations in characteristic impedance.
Innovation Solution
A transmission line design that includes a substrate with insulator layers, a mounting electrode, a signal conductor, a first ground conductor, a first connecting electrode, and inter-layer connecting conductors, where the first ground conductor does not overlap with the first connecting electrode, and the second inter-layer connecting conductor is bonded to the first connecting electrode without overlapping with the first inter-layer connecting conductor, maintaining flatness and reducing characteristic impedance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inter-layer connecting conductors are arranged in series below a mounting electrode, then electrical connection is achieved, but flatness of the mounting electrode is degraded
Solution Approach 1:
The patent transitions from a single-layer arrangement to a multi-layer stacked configuration. Inter-layer connecting conductors are distributed across multiple insulator layers, with each layer containing some connecting conductors. This dimensional distribution prevents concentration of mass in one location, thereby maintaining the flatness of the mounting electrode while achieving the required electrical connections through the stacked layers.
2Shape
If a conductor pattern is used for maintaining flatness of mounting electrodes, then flatness is improved, but deviation of characteristic impedance occurs
Solution Approach 1:
The patent introduces insulator layers as intermediary elements between the mounting electrode and the inter-layer connecting conductors. These insulator layers act as mediators that support the connecting conductors at controlled positions without allowing them to directly contact or deform the mounting electrode. This intermediary structure maintains the flatness required for good electrical connections while preventing the connecting conductors from causing characteristic impedance deviations.
Data Source
AI summary
A transmission line includes a substrate including insulator layers, a mounting electrode on a front layer of the substrate, a signal conductor, a first ground conductor, a first connecting electrode that electrically connects the mounting electrode and the signal conductor and is between the signal conductor and the first ground conductor in a laminating direction, a first inter-layer connecting conductor that is electrically connected between the mounting electrode and the first connecting electrode and is bonded to the first connecting electrode, and a second inter-layer connecting conductor that is electrically connected between the signal conductor and the first connecting electrode, is bonded to the first connecting electrode, and does not overlap with the first inter-layer connecting conductor when viewed in the laminating direction. The first ground conductor does not overlap with at least a portion of the first connecting electrode when viewed in the laminating direction.