Adaptive Antenna Tuning Using Reflection Coefficient Measurement
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Solution Overview
Problem
Existing wireless communication devices face challenges in accurately characterizing antenna performance due to measurements being taken at different reference planes, leading to inaccurate impedance determination and suboptimal tuning.
Innovation Solution
A multifunctional tuner located on the antenna reference plane measures reflection coefficient parameters directly, allowing for precise impedance determination and adaptive tuning of the antenna to ensure optimal performance across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If measurements are taken at a coupler located on a different reference plane than the antenna, then the measurement setup is simpler, but the impedance determination becomes inaccurate
Solution Approach 1:
The patent introduces a reference impedance network as an intermediary element between the coupler measurement point and the antenna. This network, comprising known impedance values, serves as a calibration reference that allows accurate impedance determination at the antenna location even when physical measurements are taken at a different reference plane. The reference impedance network mediates the relationship between the measurement point and the antenna, enabling precise characterization without requiring direct physical contact at the antenna location.
2Measurement precision
If a multifunctional tuner is used to measure and tune at the same location, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements a multifunctional tuner that integrates both measurement and tuning capabilities at the antenna reference plane. This single device performs multiple functions: measuring forward and reverse traveling signals to determine impedance, and actively tuning the antenna by adjusting matching network components. By consolidating measurement and tuning functions into one unit located at the critical reference plane, the system achieves precise antenna characterization and adaptive optimization without proportionally increasing overall device 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 solution enables precise characterization and tuning of antenna impedance, improving wireless communication performance by ensuring reliable signal transmission and reception without perceivable interference.
Implementation Method 1
The ratio of these two signals represents a reflection coefficient which may indicate the antenna impedance
Data Source
AI summary
A radio frequency device has a multifunctional tuner that stores measurements of reflection coefficient parameter in a register. The radio frequency device also has a transceiver that has a transmitter. The transceiver may detect a transmitter signal from the transmitter to an antenna in an initial tuning state and then determine whether the transmitter signal is stable. In response to the transmitter signal being stable, the transceiver may measuring the reflection coefficient parameters at the multifunctional tuner. Furthermore, the radio frequency device has a baseband controller that has a memory to store instructions and a processor to execute the instructions. The instructions cause the processor to determine an antenna impedance based on the reflection coefficient parameters, and in response to determining that the antenna impedance is greater than or less than a threshold antenna impedance, iteratively tune the antenna using the multifunctional tuner.