RF Module Substrate Layout to Block Harmonic Reception Interference
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Solution Overview
Problem
Conventional radio-frequency modules in mobile communication devices face issues with harmonic waves entering the reception path, leading to degradation of reception sensitivity.
Innovation Solution
A radio-frequency module design incorporating multiple substrates with specific electronic components and connections to minimize harmonic interference, including filters and switches, is employed to prevent harmonic waves from entering the reception path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two module substrates are used to reduce the size of the radio-frequency module, then the module size is reduced, but harmonic waves can enter the reception path causing degradation of reception sensitivity
Solution Approach 1:
The radio-frequency module is divided into two separate module substrates: a first module substrate for transmission path components and a second module substrate for reception path components. This segmentation physically separates the transmission and reception paths, preventing harmonic waves from the transmission path from interfering with the reception path while maintaining a compact overall module size.
Solution Approach 2:
A ground electrode pattern is introduced as an intermediary element between the first and second module substrates. This ground electrode acts as a shielding barrier that blocks electromagnetic interference, particularly harmonic waves, from coupling between the transmission and reception paths. The ground electrode pattern serves as a mediator that maintains electrical isolation while allowing the compact two-substrate design.
2Device complexity
If transmission and reception components are integrated on the same substrate, then the device complexity is reduced, but harmonic interference occurs between transmission and reception paths
Solution Approach 1:
The module is segmented into two substrates with clear functional separation: the first substrate contains transmission components (transmission line, power amplifier, transmission filter) and the second substrate contains reception components (reception line, low-noise amplifier, reception filter). This segmentation eliminates the harmful harmonic interference that would occur if all components were integrated on a single substrate, while keeping the overall structure relatively simple through the use of standardized substrate and component arrangements.
Solution Approach 2:
The reception path components are extracted from the transmission substrate and placed on a separate second substrate. This extraction removes the reception components from the high-interference transmission environment, eliminating the harmful harmonic wave interference while maintaining manageable device complexity through modular construction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design effectively reduces the risk of reception sensitivity degradation by managing harmonic waves, enhancing the performance of radio-frequency modules.
Implementation Method 1
a first filter whose passband includes a first band
Implementation Method 2
an inductor connected a path that forms a connection between the first low-noise amplifier and the second antenna connection terminal
Data Source
AI summary
A radio-frequency module includes one or more first electronic components disposed on one main surface and one or more second electronic components disposed on another main surface. The one or more first electronic components include at least one of a filter whose passband includes a first band, a switch connected to the filter, a power amplifier connected to the filter, and a switch connected to the filter. The one or more second electronic components include at least one of a filter whose passband includes a second band in which the frequency of a harmonic wave of a signal in the first band is included, a switch connected to the filter, a low-noise amplifier connected to the filter, and an inductor connected to a path that forms a connection between the first low-noise amplifier and an antenna connection terminal.