3D Electronic Module Layout for Stable High-Frequency Impedance
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Solution Overview
Problem
Existing electronic modules face challenges in optimizing high-frequency characteristics due to difficulties in machining and design restrictions when using Molded Interconnect Devices (MID) techniques, particularly in adjusting characteristic impedance and forming multilayer wires.
Innovation Solution
The solution involves using a GND layer on a three-dimensional structure with spacers to maintain a consistent distance from wires, optimizing characteristic impedance, and filling the gap with a dielectric material to enhance high-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If MID technique is used to integrate housing and wiring board, then device complexity is reduced and cost is lowered, but manufacturing precision and design flexibility for optimizing high-frequency characteristics are restricted
Solution Approach 1:
The patent transitions from traditional two-dimensional planar wiring boards to three-dimensional spatial structures. The wiring board is formed with raised portions and grooves that create vertical layering, allowing wires to be arranged in multiple levels and directions. This dimensional change enables optimized signal paths and impedance control while maintaining the integrated housing-wiring board structure of MID technique.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the wiring board. Raised portions provide elevated mounting surfaces for components requiring specific impedance control, while grooves create isolated channels for signal routing. This local differentiation allows precise control of characteristic impedance in high-frequency signal paths while maintaining structural integration.
2Adaptability or versatility
If wiring board is made three-dimensional with inclined and curved surfaces, then wire routing flexibility is improved, but manufacturing difficulty increases
Solution Approach 1:
The complex three-dimensional wiring board structure is segmented into standardized raised portions and grooves with uniform cross-sections. Each segment can be manufactured using identical molding or machining parameters, reducing the complexity of manufacturing inclined and curved surfaces. The segmented approach allows modular assembly and simplifies quality control.
Solution Approach 2:
The raised portions and grooves are pre-formed as integral features of the wiring board structure before component mounting and wire routing. This preliminary formation of three-dimensional features enables subsequent wire routing to follow predetermined paths with controlled impedance, avoiding the need for complex post-processing machining operations.
3Reliability
If spacer members are used to maintain equal dielectric thickness, then high-frequency characteristics are optimized, but device complexity increases
Solution Approach 1:
The spacer members are merged with the housing structure, forming an integrated assembly where the housing and spacers constitute a unified support framework. This combination reduces the number of discrete components while maintaining the equal dielectric thickness function. The housing itself becomes part of the impedance control mechanism rather than merely a protective enclosure.
Data Source
AI summary
An electronic module includes a first structure including a flat mounting surface on which an integrated circuit is mounted and a wiring surface including a surface including a portion that changes in a direction perpendicular to the mounting surface, a wire connected to the integrated circuit being extended on the wiring surface, a second structure disposed with a dielectric region interposed with respect to the wiring surface of the first structure, a metal pattern being provided on the second structure, and at least one spacer member that equalizes thickness of the dielectric region between the wire and the metal pattern in an entire range between the mounting surface and the wiring surface including the surface including the portion that changes in the direction perpendicular to the mounting surface.