RF Module Phase Adjustment for Multi-Band Impedance Matching
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Solution Overview
Problem
Existing radio-frequency circuits face challenges in achieving optimal impedance characteristics when multiple filters with different frequency bands are simultaneously connected to an antenna terminal.
Innovation Solution
The radio-frequency module incorporates a first and second acoustic-wave filter, a switch, and a phase adjustment circuit with specific inductors and capacitors to manage impedance across different communication bands, allowing simultaneous connection of filters to an antenna terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple acoustic-wave filters are simultaneously connected to an antenna terminal, then multi-band communication capability is improved, but impedance characteristics deteriorate
Solution Approach 1:
A third acoustic-wave filter is introduced as an intermediary element between the antenna terminal and the signal processing circuit. This filter acts as a mediator that helps maintain impedance matching when multiple filters are simultaneously connected, thereby resolving the contradiction between multi-band capability and impedance characteristics
Solution Approach 2:
The impedance characteristics are improved by changing the parameters of the filtering circuit, specifically by adding a third filter with特定的 frequency characteristics that complement the first and second filters. This parameter adjustment allows the system to maintain good impedance matching across multiple frequency bands
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 maintains impedance matching across multiple frequency bands, enhancing communication performance by minimizing shifts in impedance and reducing parasitic effects, thereby achieving more excellent impedance characteristics.
Implementation Method 1
a first acoustic-wave filter that transmits a signal in a first communication band
Implementation Method 2
a second acoustic-wave filter that transmits a signal in a second communication band
Implementation Method 3
The first inductor is provided between ground and a node on a signal path with which the switch is connected to the second acoustic-wave filter
Implementation Method 4
The phase adjustment circuit includes an inductor, a first capacitor, a second capacitor
Data Source
AI summary
To provide a radio-frequency module and a communication apparatus capable of achieving more excellent impedance characteristics. A radio-frequency module includes a first acoustic-wave filter (a first reception filter), a second acoustic-wave filter (a second reception filter), a switch (an antenna switch), a first inductor, and a second inductor. The first acoustic-wave filter transmits a signal in a first communication band. The second acoustic-wave filter transmits a signal in a second communication band. The first inductor is provided between ground and a node on a signal path (a second reception path) with which the switch is connected to the second acoustic-wave filter. The second inductor is connected in series between the switch and the first inductor on the signal path.