Liquid Crystal Reflecting Surface With Discrete Phase Control
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Solution Overview
Problem
Existing radio wave reflecting systems, particularly those utilizing metasurfaces for 5G communication, require complex configurations to dynamically control the reflection direction and receive multiple signals, making them inefficient and prone to failure when installed near shields.
Innovation Solution
A radio wave reflecting system with a simple configuration that includes a two-axis controllable radio wave reflecting device, utilizing a reflector with patch electrodes, a liquid crystal layer, and a driver IC to control the reflection direction using a minimal number of signals, including a pattern selection signal and voltage inputs to adjust phase values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a metasurface with multiple antenna elements is used to control transmission direction, then the communication area can be widened, but the device complexity increases
Solution Approach 1:
The patent changes the physical state of the liquid crystal material by applying different voltage levels to alter its dielectric constant, thereby controlling the phase of reflected radio waves. This allows dynamic adjustment of transmission direction and communication area coverage without adding complex mechanical moving parts or multiple fixed antenna arrays.
2Ease of operation
If liquid crystal is used to adjust amplitude and phase of high-frequency signals, then the directivity can be controlled, but the alignment state control becomes complex
Solution Approach 1:
The patent applies different voltage levels (0V, 3.3V, 5V) to the liquid crystal layer to achieve distinct alignment states with corresponding dielectric constants. This simplifies the control mechanism by using discrete voltage levels rather than continuous adjustment, making the directivity control more manageable while maintaining operational flexibility.
3Ease of manufacture
If a simple configuration is used, then the system is easier to install, but the reliability may be reduced when installed near shields
Solution Approach 1:
The patent employs a dynamically adjustable liquid crystal layer that can change its electromagnetic properties in real-time through voltage control. This dynamic capability allows the system to adapt to varying environmental conditions including proximity to shields, maintaining reliable operation while keeping the overall configuration simple and easy to install.
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 system effectively controls the reflection direction of radio waves with a simplified setup, reducing signal complexity and ensuring operation even when installed near shielding objects.
Implementation Method 1
utilizes a change in dielectric constant due to an alignment state of a liquid crystal
Implementation Method 2
a change in dielectric constant due to an alignment state of a liquid crystal
Implementation Method 3
Radio wave reflecting system includes an intelligent reflecting surface including a plurality of patch electrodes
Data Source
AI summary
A radio wave reflection system includes an intelligent reflecting surface including a plurality of patch electrodes, an electrode layer, and a liquid crystal layer, and a driver IC electrically connected to the plurality of patch electrodes and including an output signal generating unit and a timing pattern signal generating unit electrically connected to the output signal generating unit. The timing pattern signal generating unit generates a plurality of pattern signals including voltage values corresponding to each of a plurality of predetermined phase values using an address signal indicating a position where the intelligent reflecting surface is to be placed, a power supply voltage, and a pattern selection signal selecting a plurality of parameters including a plurality of predetermined phase values. The output signal generating unit generates a plurality of output signals based on each of the plurality of pattern signals using the plurality of pattern signals.