Sequential Antenna Impedance Tuning Using Reflection Coefficients
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Solution Overview
Problem
The use of multiple transmit and receive antennas in user equipment complicates antenna characterization and impedance matching due to varying orientations, positions, and user interactions, which affects optimal power transfer.
Innovation Solution
A method involving a directional coupler and antenna switch array is used to sequentially transmit a reference signal through each antenna, allowing for impedance characterization and tuning by comparing incident and reflected signals to determine the reflection coefficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmit and receive antennas are used to increase data rates and signal strength, then the achievable data rate and received signal strength are improved, but the complexity of antenna characterization and impedance matching worsens
Solution Approach 1:
The patent segments the antenna system into individual antenna elements, each characterized separately through sequential selection. The antenna switch array divides the multiple antennas into individually addressable units, allowing independent impedance measurement and tuning for each element, thereby managing the complexity of characterizing multiple antennas.
Solution Approach 2:
The patent employs dynamic impedance tuning through tuners that can adjust impedance values in real-time. The antenna switch array dynamically selects which antenna element to characterize, and the tuners dynamically adjust impedance to achieve optimal matching, making the system adaptable rather than static.
2Loss of energy
If antenna impedances are individually optimized for maximum power transfer, then power transfer efficiency is improved, but the device complexity and tuning requirements worsen
Solution Approach 1:
The patent implements feedback through the directional coupler that measures reflected signals from each antenna element. This measurement feedback is used by the controller to determine optimal tuner settings, creating a closed-loop system that automatically adjusts impedance to maximize power transfer without requiring complex manual tuning.
Solution Approach 2:
The system performs self-characterization and self-tuning of antenna impedances. The controller automatically controls the antenna switch array to select each antenna, activates the directional coupler to measure reflections, and adjusts the tuners based on measured values, enabling the system to optimize itself without external intervention.
3Measurement precision
If sequential antenna selection is performed for impedance measurement, then measurement accuracy is improved, but the time required for characterization worsens
Solution Approach 1:
The patent uses periodic action by sequentially and systematically cycling through each antenna element in a predetermined order. The antenna switch array periodically switches between antenna elements, allowing structured measurement of each one's impedance characteristics, which balances thoroughness with efficiency.
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 enables accurate impedance matching of both transmit and receive antennas, optimizing power transfer and reducing call drops and power consumption.
Implementation Method 1
transmit a reference signal amplified by the amplifier from the antenna and to cause the directional coupler to produce a reflected signal from the antenna
Data Source
AI summary
A user equipment (UE) is provided that includes an antenna switch array for demultiplexing a reference signal sequentially to each antenna in a plurality of antennas. While the antenna switch array selects an antenna, the UE measures a reflection coefficient for the antenna. The UE then tunes the antenna responsive to the reflection coefficient measurement.