Integrated Impedance Sensing in Tunable Antenna Matching Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing impedance matching systems in mobile communication devices face challenges due to varying antenna impedances, which lead to reflection losses, degraded noise figure, power losses, and frequency response changes, necessitating a tuneable impedance matching system that can effectively adapt to changing conditions without the limitations of separate measuring circuits and transmission lines.
Innovation Solution
A tuneable impedance matching circuit that functions as both a measuring and matching circuit, utilizing voltage sensors to measure voltages from multiple nodes and calculation means to determine adjustable component values based on load impedance, eliminating the need for a separate measuring circuit and reducing electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate measuring circuit is used to measure antenna impedance, then measurement accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the measuring circuit and impedance matching circuit into a single integrated circuit. The same circuit components are used for both measuring antenna impedance and performing impedance matching, eliminating the need for separate measuring circuitry. This integration maintains measurement accuracy while significantly reducing device complexity and power consumption.
Solution Approach 2:
The impedance matching circuit is designed to serve dual functions: it acts as both a measuring circuit for determining antenna impedance and as a matching circuit for optimizing power transfer. This multi-functionality allows the system to achieve accurate measurements without adding separate dedicated measuring components, thereby reducing overall system complexity.
2Reliability
If transmission lines are used for signal transmission, then signal integrity is improved, but electromagnetic radiation and interference increase
Solution Approach 1:
The patent eliminates transmission lines from the system by directly integrating the antenna connection with the impedance matching circuit. By removing the transmission line component, the system avoids the electromagnetic radiation and interference problems associated with traditional transmission line implementations while maintaining signal integrity through direct circuit coupling.
3Device complexity
If impedance matching is not performed, then device simplicity is maintained, but power losses and performance degradation occur
Solution Approach 1:
The system performs self-adjusting impedance matching by automatically measuring antenna impedance and configuring the matching circuit components accordingly. This self-service capability ensures optimal power transfer and minimal power losses without requiring external intervention or complex manual adjustment mechanisms, maintaining device simplicity while achieving effective impedance matching.
Data Source
AI summary
An impedance matching system may be used, for example, for impedance matching between a transmitter/receiver front-end and an antenna in a mobile communication device. In a tuneable impedance matching system according to the invention a tuneable impedance matching circuit (508) is used also as a measuring circuit for obtaining a value of a load impedance. A real part and an imaginary part of a load impedance (503) is calculated based on voltages measured on nodes of the tuneable impedance matching circuit and on known component values of the tuneable impedance matching circuit. Values for adjustable electrical components (504, 505) of the tuneable impedance matching circuit are determined based on the obtained load impedance value and on an impedance matching condition.