RF Module Layout Shielding Between PA and LNA
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Solution Overview
Problem
In mobile communication devices, the proximity of high-power transmission power amplifiers and low noise amplifiers in radio frequency modules leads to harmonic interference and intermodulation distortion, causing deterioration of reception sensitivity.
Innovation Solution
A radio frequency module design where a conductive member, such as a duplexer or filter, is physically positioned between the downstream amplifying elements of the transmission power amplifier and the low noise amplifier to prevent harmonic and intermodulation distortion components from flowing into the reception path, thereby reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power amplifier and low noise amplifier are adjacent to each other in a single module, then the device complexity is reduced and integration is improved, but the reception sensitivity deteriorates due to harmonic interference and intermodulation distortion
Solution Approach 1:
The patent segments the radio frequency module into distinct transmission and reception regions. The power amplifier is positioned in a transmission region while the low noise amplifier is positioned in a reception region, physically separating high-power and low-power signal paths to prevent interference while maintaining module integration.
Solution Approach 2:
The patent introduces a conductive member (such as a ground shield or conductive partition) as an intermediary element between the power amplifier and low noise amplifier. This conductive member acts as a barrier to block harmonic components and intermodulation distortion from the power amplifier from flowing into the low noise amplifier, while allowing both amplifiers to remain in the same module.
2Power
If cascaded amplifying elements are used in the power amplifier, then the transmission power is increased, but the harmonic components and intermodulation distortion increase and interfere with the low noise amplifier
Solution Approach 1:
The patent extracts and removes the harmful harmonic components and intermodulation distortion generated by the cascaded amplifying elements through the use of a conductive member barrier. This allows the power amplifier to maintain high transmission power while preventing the extracted harmful factors from affecting the low noise amplifier.
Solution Approach 2:
The patent converts the harmful harmonic components and intermodulation distortion into a controllable electromagnetic field that can be directed and contained by the conductive member. The conductive member reflects and contains these harmful emissions, redirecting them away from the low noise amplifier path, thus turning a potential interference problem into a manageable electromagnetic containment solution.
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
This configuration effectively reduces the deterioration of reception sensitivity by preventing high-power radio frequency signals and their harmonics from interfering with the low noise amplifier, enhancing the overall performance of the radio frequency module.
Implementation Method 1
a conductive member is physically disposed between the first amplifying element and the first reception low noise amplifier
Data Source
AI summary
A radio frequency module includes: a transmission power amplifier that includes a plurality of amplifying elements that are cascaded; a reception low noise amplifier; and a module board on which the transmission power amplifier and the reception low noise amplifier are mounted. The plurality of amplifying elements include: an amplifying element disposed most downstream; and an amplifying element disposed upstream of the amplifying element, and in a plan view of the module board, a conductive member is physically disposed between the amplifying element and the reception low noise amplifier.