Directional Coupler Layout for Accurate RF Load Impedance Detection
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Solution Overview
Problem
Existing radio-frequency communication devices face inaccuracies in load impedance detection due to the detection of electric and magnetic field coupling signals instead of electromagnetic field coupling signals, which degrades the accuracy of load impedance detection.
Innovation Solution
A directional coupler configuration that enables magnetic and electric field coupling, incorporating capacitive elements to detect electromagnetic field coupling signals, enhancing the accuracy of load impedance detection by combining signal components through capacitive and inductive couplings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electric field coupling or magnetic field coupling is used for signal detection, then the detection mechanism is simple, but the load impedance detection accuracy deteriorates
Solution Approach 1:
The patent combines electric field coupling and magnetic field coupling mechanisms into a unified directional coupler structure. The sub-line is positioned to simultaneously achieve electric field coupling with the main line through capacitive elements and magnetic field coupling through inductive elements, enabling comprehensive electromagnetic field detection that improves load impedance measurement accuracy while maintaining structural simplicity
2Device complexity
If only electric field coupling or only magnetic field coupling is detected, then the detection circuit is simple, but the signal detection completeness deteriorates
Solution Approach 1:
The detection circuit is designed to simultaneously capture both electric field coupling signals through capacitive dividers and magnetic field coupling signals through inductive coupling between the main line and sub-line. This merged detection approach ensures complete signal information is captured for accurate load impedance detection without significantly increasing circuit complexity
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 solution improves the accuracy of load impedance detection by generating signals through electromagnetic field coupling, allowing for precise extraction of power, resistance, and reactance components, thereby stabilizing radio-frequency signal power and optimizing circuit components.
Implementation Method 1
The first sub-line and the main line are arranged in a manner that enables magnetic field coupling and electric field coupling
Implementation Method 2
The first sub-line and the main line are arranged in a manner that enables magnetic field coupling and electric field coupling
Implementation Method 3
electric fields are coupled using a capacitive divider to detect electric field coupling signals
Data Source
AI summary
A directional coupler includes an input terminal, an output terminal, a detection terminal, a main line coupled to the input terminal and the output terminal, a sub-line, and a capacitor. The sub-line and the main line are arranged in a manner that enables magnetic field coupling and electric field coupling. The sub-line is coupled to one end of the capacitor and the detection terminal. The other end of the capacitor is coupled to ground.