RF Module Board Layout for LNA Isolation Across Communication Bands
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Solution Overview
Problem
In compact radio frequency front-end circuits of mobile communication devices, close proximity of low-noise amplifiers for different communication bands leads to mutual interference and reduced reception sensitivity due to signal superimposition.
Innovation Solution
The radio frequency module is configured with low-noise amplifiers for different communication bands mounted on opposite surfaces of a module board, separating them to prevent interference and improve isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple low-noise amplifiers for different communication bands are mounted on the same module board in close proximity, then the device complexity is reduced and integration is improved, but mutual interference and signal superimposition occur between the amplifiers, deteriorating reception sensitivity
Solution Approach 1:
The patent applies dimensionality change by mounting low-noise amplifiers for different communication bands on opposite surfaces of the module board instead of placing them close together on the same surface. This spatial separation in the vertical dimension eliminates mutual interference and signal superimposition while maintaining integration, thereby resolving the contradiction between reduced device complexity and maintained reception sensitivity.
2Volume of moving object
If low-noise amplifiers are placed close together to achieve compact design, then the module size is reduced, but isolation between reception paths deteriorates due to mutual interference
Solution Approach 1:
The patent resolves the contradiction between compact module size and reduced mutual interference by utilizing the vertical dimension through opposite surfaces of the module board. This arrangement maintains a compact footprint while achieving sufficient isolation between amplifiers for different communication bands, preventing harmful signal superimposition.
3Productivity
If multiple reception paths are integrated in a single module, then productivity and integration are improved, but signal superimposition occurs reducing reception sensitivity
Solution Approach 1:
The patent maintains high integration efficiency by incorporating multiple reception paths in a single module while preventing signal quality degradation through vertical separation. By mounting amplifiers on opposite surfaces, the design achieves both high productivity through integration and preserved reception signal quality without mutual interference.
Data Source
AI summary
A radio frequency module includes a first reception low-noise amplifier that amplifies a radio frequency reception signal of a first communication band, a second reception low-noise amplifier configured to amplify a radio frequency reception signal of a second communication band different from the first communication band, and a module board which includes a first principal surface and a second principal surface on opposite sides of the module board, and on which the first reception low-noise amplifier and the second reception low-noise amplifier are mounted. The first reception low-noise amplifier is disposed on the first principal surface, and the second reception low-noise amplifier is disposed on the second principal surface.