RF Matching Circuit Switching for Harmonic Suppression in Compact Modules
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Solution Overview
Problem
Radio frequency modules face challenges in size reduction while effectively suppressing harmonic wave noise, as existing solutions often require additional circuits that increase module size.
Innovation Solution
A radio frequency module design incorporating a first and second power amplifier, with a matching circuit that includes capacitors, inductors, and a selection switch, allowing switching between impedance matching and harmonic wave suppression functions to reduce noise without increasing module size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an open stub is added to reduce unnecessary signals from the second power amplifier, then harmonic wave noise is suppressed, but the module size increases
Solution Approach 1:
The matching circuit is designed to perform multiple functions: impedance matching for the second power amplifier and harmonic wave suppression for the first power amplifier. By integrating both functions into a single circuit block, the patent eliminates the need for separate open stub structures, thereby suppressing harmonic wave noise without increasing module size.
Solution Approach 2:
The patent combines the impedance matching function and harmonic wave suppression function into a single matching circuit. The circuit merges the roles of what would traditionally be separate components (impedance matching network and harmonic suppression stub), achieving both objectives within one integrated structure.
2Object-generated harmful factors
If a matching circuit with fixed configuration is used, then impedance matching is achieved, but harmonic wave noise cannot be suppressed
Solution Approach 1:
The matching circuit incorporates switching elements that allow it to dynamically change its configuration based on operational requirements. The circuit can switch between different states to perform either impedance matching or harmonic wave suppression, making the system adaptable rather than fixed.
Solution Approach 2:
The matching circuit is designed as a universal circuit that can perform multiple functions (impedance matching and harmonic wave suppression) depending on the switching state. This multi-functional design allows the same circuit structure to adapt to different operational needs without requiring separate dedicated circuits.
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 effectively suppressing harmonic wave noise, enhancing the module's performance and efficiency.
Implementation Method 1
The matching circuit switches between an impedance matching function and a harmonic wave suppression function
Implementation Method 2
a harmonic wave suppression function of reducing harmonic wave noise outputted from the first power amplifier
Implementation Method 3
The matching circuit includes at least one capacitor, an inductor connected in series to the at least one capacitor
Data Source
AI summary
A radio frequency module includes a first power amplifier, a second power amplifier, and a matching circuit. The matching circuit is connected to an output terminal of the second power amplifier and is connected to a reception path. The matching circuit includes at least one capacitor, an inductor connected in series to the at least one capacitor, and a selection switch. The matching circuit switches between an impedance matching function and a harmonic wave suppression function of reducing harmonic wave noise outputted from the first power amplifier by switching a state of the selection switch.