High-Frequency Module Substrate Stacking for RF Isolation
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Solution Overview
Problem
Conventional high-frequency modules experience deteriorated isolation characteristics between switch units and amplifying units, leading to signal oscillation when outputs are interconnected, which affects the performance of mobile communication devices.
Innovation Solution
A radio frequency module design where the switch unit and amplifying unit are placed on different layers or main surfaces of a substrate, with a matching circuit element on one surface and a filter on the other, and a semiconductor chip component partially overlapping the matching circuit element, enhancing isolation by increasing the distance between these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the switch unit and amplifying unit are placed on the same substrate surface, then the device complexity is reduced, but the isolation characteristics deteriorate leading to signal oscillation
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional planar arrangement to a three-dimensional stacked arrangement. The matching circuit element is positioned on the first main surface of the substrate while the amplifying unit is positioned on the second main surface, utilizing the vertical dimension to achieve spatial separation. This resolves the contradiction by maintaining structural integration while improving isolation characteristics through increased distance between the switch unit and amplifying unit.
2Reliability
If the distance between switch unit and amplifying unit is increased, then isolation characteristics improve, but the area occupied on the substrate increases
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension (thickness direction of substrate) to increase the distance between the switch unit and amplifying unit. By placing the matching circuit element on the first main surface and the amplifying unit on the second main surface, the isolation distance is maximized without expanding the substrate footprint, thus maintaining compact device area while achieving superior isolation characteristics.
Solution Approach 2:
The patent applies nesting by stacking functional units vertically on different surfaces of the substrate. The matching circuit element and amplifying unit are nested in a three-dimensional configuration where one is on the first main surface and the other on the second main surface, allowing compact integration while maintaining adequate isolation distance.
3Device complexity
If the switch unit and amplifying unit are integrated in one semiconductor chip component, then the device complexity is reduced, but the isolation characteristics deteriorate
Solution Approach 1:
The patent resolves this contradiction by using three-dimensional spatial separation within the integrated component. The matching circuit element and amplifying unit are positioned on opposite main surfaces of the substrate, achieving physical isolation through vertical separation while maintaining integration within a single component structure. This eliminates signal oscillation issues while preserving component integration benefits.
Data Source
AI summary
A radio frequency module includes a substrate having first and second main surfaces; a first filter; third and fourth switches connected to the filter; an amplifier; and/or a matching circuit element connected to the first filter. In various embodiments, the matching circuit element may be on the first main surface while the amplifier may be on the second main surface; the matching circuit element may be on the first main surface while the third switch may be on the second main surface; and/or the filter may be on the first main surface while the fourth switch may be on the second main surface.