RF Module Layout With Separated Matching and Power Amplifier
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Solution Overview
Problem
Integrating matching elements and power amplifiers into a single component in radio-frequency modules degrades electrical characteristics and worsens heat dissipation, hindering size reduction in mobile communication devices.
Innovation Solution
A radio-frequency module design featuring a first base made of high thermal conductivity silicon and a second base made of lower thermal conductivity gallium arsenide, with a matching element outside both bases, allowing for reduced size while maintaining electrical characteristics and improving heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If matching elements and power amplifiers are integrated into a single component, then the size of the radio-frequency module is reduced, but the electrical characteristics (Q value) of the matching element degrades and the noise factor increases
Solution Approach 1:
The patent divides the radio-frequency module into separate components: a first base containing the matching element and a second base containing the power amplifier circuit. This segmentation allows each component to be optimized independently, preventing the degradation of matching element electrical characteristics while still achieving overall size reduction through integrated packaging.
Solution Approach 2:
The patent employs a nested structure where the first base and second base are overlapped in a plan view, with the second base arranged between the module substrate and the first base in a sectional view. This nesting approach allows compact arrangement of separate components, reducing the overall module size while maintaining their independence.
2Volume of moving object
If matching elements and power amplifiers are integrated into a single component, then the size of the radio-frequency module is reduced, but the heat dissipation effect of the power amplifier worsens
Solution Approach 1:
By separating the power amplifier circuit into its own second base with dedicated thermal management structures (heat dissipation fins, thermal vias), the patent enables effective heat dissipation independent of the matching element base, preventing thermal interference while achieving compact integration.
Solution Approach 2:
The patent extracts the heat dissipation function from the integrated component structure and implements it as a dedicated thermal management system in the second base, including heat dissipation fins extending from the power amplifier circuit substrate, thereby addressing thermal issues separately from the RF performance considerations.
3Loss of energy
If matching elements are placed outside both bases, then wiring losses and mismatching losses are reduced, but the device complexity increases
Solution Approach 1:
The patent reduces wiring losses by placing the matching element outside both bases and connecting it through optimized inter-base wiring structures. The nested arrangement of bases with overlapping footprints minimizes the length of connection paths while maintaining the benefit of separate component placement.
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 design achieves size reduction while preserving electrical performance and heat dissipation efficiency by separating matching elements and power amplifiers, reducing wiring losses and mismatching losses.
Implementation Method 1
a first base at least part of which is made of a first semiconductor material... a second base at least part of which is made of a second semiconductor material having thermal conductivity lower than that of the first semiconductor material
Implementation Method 2
The first matching element includes at least one of an inductor and a capacitor
Implementation Method 3
The first matching element includes at least one of an inductor and a capacitor
Data Source
AI summary
A radio-frequency module includes a first base including electrical circuits, a second base including a power amplifier circuit, a matching component that is arranged outside the first base and the second base and that includes a first matching element connected to the power amplifier circuit, and a module substrate having a main surface on which the first base, the second base, and the matching component are arranged. The first base is joined to the main surface via an electrode. The second base is arranged between the module substrate and the first base in a sectional view and is joined to the main surface via an electrode. At least part of the first base is overlapped with at least part of the second base in a plan view.