RF Module Filter Layout for Compact Multi-Band Reliability
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Solution Overview
Problem
Existing radio frequency modules experience deterioration of characteristics when active elements are disposed on multiple passive components, particularly in multi-band technology applications.
Innovation Solution
A radio frequency module design that includes a module substrate with passive components and a first filter component comprising series and parallel arm resonators, where the region of the second series arm resonator does not overlap the passive components, while other regions of the filter component partially overlap the passive components, improving structural integrity and reducing characteristic deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If active elements are disposed on multiple passive components to miniaturize the radio frequency module, then the module size is reduced, but the characteristics of the elements are deteriorated
Solution Approach 1:
The filter component is segmented into distinct resonator regions (first, second, and third series arm resonators) with specific spatial arrangements. The second series arm resonator is positioned in a region that does not overlap with passive components, while other regions of the filter component overlap with passive components, creating differentiated zones for optimal performance
Solution Approach 2:
Different regions of the filter component have different overlap characteristics with passive components. Specifically, the region with the second series arm resonator has no overlap with passive components to preserve its characteristics, while other regions have controlled overlap to achieve miniaturization without significantly impacting overall performance
2Area of stationary object
If the filter component is disposed over passive components to reduce area, then the module area is reduced, but the characteristics deteriorate due to overlap
Solution Approach 1:
Instead of completely avoiding overlap between the filter component and passive components (which would require larger area), the design accepts partial overlap in certain regions while maintaining non-overlap in critical regions. This partial application of the non-overlap principle achieves a balance between miniaturization and characteristic preservation
Solution Approach 2:
The patent utilizes vertical stacking (disposing the filter component over passive components in the vertical dimension) to reduce the horizontal footprint of the module. By transitioning from a two-dimensional layout to a three-dimensional arrangement, the module achieves compactness while managing overlap effects through strategic positioning of resonators
Data Source
AI summary
A radio frequency module includes a module substrate, a plurality of passive components disposed on a main surface of the module substrate, and a filter component disposed over the plurality of passive components, wherein the filter component includes series arm resonators that constitute an acoustic wave filter, the series arm resonator is connected between the series arm resonators, and a region of the filter component formed with the series arm resonator does not overlap the plurality of passive components and at least a part of the other region of the filter component overlaps at least a part of each of the plurality of passive components in a plan view of the module substrate.