Resonant Conductor Loop for RF Crosstalk Reduction
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Solution Overview
Problem
Magnetic coupling between electronic circuits in RF transceivers causes crosstalk, affecting performance, especially in carrier aggregation scenarios where harmonics of low band signals interfere with receive signals.
Innovation Solution
A conductor loop with a tuning element forms a resonant circuit tuned to the frequency of the signal processed by the second electronic circuit, inducing a current that opposes the initial magnetic field, reducing magnetic coupling and allowing closer integration of electronic components without affecting RF performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electronic circuits are integrated closer to increase integration density, then productivity and device compactness are improved, but magnetic coupling between circuits increases causing crosstalk and performance degradation
Solution Approach 1:
A conductor loop is introduced as an intermediary element between the first and second electronic circuits. The loop is tuned to resonate at the frequency of the second circuit, creating a counteracting magnetic field that cancels the harmful magnetic coupling. This intermediary structure enables closer integration while maintaining circuit performance by actively neutralizing the magnetic interference rather than merely shielding or isolating the circuits.
2Object-affected harmful factors
If magnetic shielding structures are added to reduce magnetic coupling, then crosstalk is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The conductor loop's electrical parameters (inductance and capacitance) are adjusted to achieve resonance at a specific frequency. By changing the electrical parameters of the loop rather than adding complex physical shielding structures, the solution reduces magnetic coupling through parameter optimization. The loop can be implemented as a simple conductive path with tuned electrical characteristics, avoiding the need for bulky or complex shielding materials and structures.
3Reliability
If magnetic shielding is implemented to protect sensitive circuits, then signal quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The conductor loop structure is designed to be self-tuning through its inherent resonance properties. When the loop is placed near the electronic circuits, it automatically resonates at the target frequency and generates the counteracting magnetic field without requiring external control or adjustment mechanisms. This self-service characteristic reduces the need for precise manual alignment or complex control systems, making the solution more robust to manufacturing variations while maintaining signal quality.
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 proposed magnetic shielding effectively reduces magnetic coupling between electronic circuits, enhancing signal quality and enabling increased integration density without compromising RF performance.
Implementation Method 1
A conductor loop with a tuning element forms a resonant circuit tuned to the frequency of the signal processed by the second electronic circuit, inducing a current that opposes the initial magnetic field
Implementation Method 2
A conductor loop with a tuning element forms a resonant circuit tuned to the frequency of the signal processed by the second electronic circuit
Data Source
Figure 1a~1c
Figure 2~3
Figure 4
AI summary
An apparatus for reducing a magnetic coupling between a first electronic circuit and a second electronic circuit is provided. The apparatus includes a conductor loop enclosing the first electronic circuit or the second electronic circuit, and a tuning element coupled to the conductor loop. The conductor loop and the tuning element form a resonant circuit, wherein the tuning element is configured to adjust a resonance frequency of the resonant circuit to a frequency related to a frequency of a signal processed by the second electronic circuit.