Coupler Switch Filter Routing for Multi-Band RF Feedback Isolation
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Solution Overview
Problem
In electronic devices supporting multiple frequency bands, mutual interference between feedback paths occurs due to the limited isolation feature of switch devices, leading to signal distortion and errors in controlling output transmission.
Innovation Solution
An electronic device is designed with a coupler switch that includes a filter to pass signals of one frequency band while attenuating signals of another, and a plurality of switches to selectively route feedback signals to a transceiver, preventing interference by alternating between paths based on operation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coupler switch is used to selectively route feedback signals from multiple RF modules to a transceiver, then the device can support multiple frequency bands with a limited number of transceiver ports, but the limited isolation feature of the switch causes mutual interference between feedback paths
Solution Approach 1:
A filter is introduced as an intermediary component between the coupler switch and the transceiver. The filter selectively passes feedback signals from the active frequency band while attenuating signals from other bands, thereby preventing mutual interference and improving isolation without requiring additional transceiver ports
Solution Approach 2:
The system dynamically changes the frequency response parameters of the filter based on the active frequency band. When a specific band is active, the filter is configured to pass that band's feedback signal while attenuating others, adapting the isolation characteristics to match the current operation mode
2Device complexity
If multiple feedback paths are connected to a single transceiver port through switching, then device complexity is reduced, but signal distortion and control errors occur due to interference between simultaneous feedback signals
Solution Approach 1:
The filter acts as a mediator that cleans the feedback signal by removing unwanted frequency components from other bands before the signal reaches the transceiver, ensuring accurate feedback for power amplifier control without requiring multiple transceiver ports
Solution Approach 2:
The system acknowledges that multiple feedback signals will be present at the switch output, but converts this potentially harmful situation into a beneficial one by using the filter to selectively extract the desired feedback signal while suppressing others, turning the interference problem into a frequency-selective filtering opportunity
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 improves isolation between feedback signals, preventing undesired interference and ensuring accurate control of output transmission without distortion, even during simultaneous transmission of multiple frequency bands.
Implementation Method 1
a filter configured to pass the signals of the first frequency band and to attenuate the signals of the second frequency band
Data Source
AI summary
An electronic device includes: a processor; a first radio frequency (RF) module; a second RF module; a coupler switch operatively connected to the first RF module and the second RF module; and a transceiver operatively connected to the processor, the coupler switch, and the first RF module, and the second RF module, wherein the coupler switch is configured to selectively switch between a first path in which a first feedback signal passes through the filter and a second path in which the second feedback signal is transferred to the transceiver without passing through the filter, and wherein the processor is configured to alternately connect the coupler switch to the first path or the second path, based on an operation mode.