Active Anti-Interference Circuit for Mobile Terminals
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Solution Overview
Problem
Existing anti-interference methods for mobile devices, which involve enclosing interference sources with shielding cases, suffer from poor stability, reliability, and high failure rates, and are not applicable to high devices or connectors.
Innovation Solution
An anti-interference method and circuit that elicits the target interference signal, performs phase reversal and amplitude modulation processing to create a suppression signal, and uses this signal to directly suppress the interference, either through directional radiation or feedback, reducing the need for shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding cases are used to enclose interference sources, then interference signals are blocked through multiple reflections, but the method has poor stability and reliability leading to frequent probabilistic failures
Solution Approach 1:
The patent replaces the mechanical shielding approach (physical enclosure with shielding cases) with an electronic signal processing system. The interference signal is captured by an antenna and processed through a series of electronic components (phase reversal circuit, amplitude modulation circuit, mixer) to generate a cancellation signal that is subtracted from the original signal, thereby eliminating the need for physical shielding structures and improving reliability
Solution Approach 2:
The patent converts the harmful interference signal into a useful cancellation signal. By capturing the interference signal, reversing its phase, and modulating its amplitude to match the original interference characteristics, the system transforms the harmful signal into a beneficial counter-signal that actively cancels the interference when combined with the original signal through subtraction
2Object-affected harmful factors
If shielding cases are combined with shielding ribs to enclose interference sources, then transmission paths are blocked, but this manner is not applicable to high devices which cannot be enclosed
Solution Approach 1:
The patent creates a universal anti-interference solution that can be applied to various devices including high devices that cannot be enclosed. The electronic signal processing system uses standard components (antenna, phase reversal circuit, amplitude modulation circuit, mixer) that can be integrated into different device types without requiring physical enclosure modifications, making it universally applicable across diverse hardware configurations
Solution Approach 2:
The patent replaces the mechanical enclosure system (shielding cases and ribs) with an electronic signal processing approach that does not require physical containment. This substitution enables the anti-interference functionality to be implemented in devices where mechanical enclosure is not feasible, such as high devices with specific form factor constraints
3Object-affected harmful factors
If shielding cases are used to enclose interference sources, then interference signals are reflected multiple times, but this manner has poor stability and reliability
Solution Approach 1:
The patent implements a feedback-based active cancellation system. The interference signal is captured, processed through phase reversal and amplitude modulation to create an accurate counter-signal, and then combined with the original signal in a mixer. This feedback loop continuously generates and applies the cancellation signal, providing stable and reliable interference suppression that does not depend on the inconsistent performance of passive shielding structures
Solution Approach 2:
The patent substitutes the unreliable mechanical shielding system with a stable electronic feedback system. The active signal processing approach using phase reversal, amplitude modulation, and mixing provides consistent and predictable interference cancellation, eliminating the probabilistic failures associated with passive shielding enclosures
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 approach enhances stability and reliability, lowers failure rates, and is applicable to various interference sources, including high devices and connectors, by directly addressing interference at its source.
Implementation Method 1
phase reversal processing is performed on the elicited target interference signal
Implementation Method 2
amplitude modulation processing is performed on the target interference signal subject to phase reversal processing according to a target amplitude value of the target interference signal
Implementation Method 3
When the target interference signal radiates out, the interference suppression signal radiates out from a directional radiation antenna
Implementation Method 4
interference suppression signal and the target interference signal are opposite in phase
Data Source
AI summary
Provided is anti-interference method and circuit, and a mobile terminal. The method includes: eliciting a target interference signal to be suppressed from an interference source; performing phase reversal processing on the elicited target interference signal; performing amplitude modulation processing according to a target amplitude value of the target interference signal to obtain an interference suppression signal, where the interference suppression signal and the target interference signal to be suppressed are opposite in phase and the interference suppression signal has an amplitude value less than or equal to the target amplitude value; and suppressing the target interference signal in the interference source using the obtained interference suppression signal.