Intelligent Reflecting Surface Phase Control via Liquid Crystal Dielectric Tuning
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Solution Overview
Problem
Existing intelligent reflecting surfaces using liquid crystals face challenges in efficiently controlling the reflection direction of radio waves due to limitations in adjusting the dielectric constant and phase differences between adjacent reflection controllers, which affects the accuracy and efficiency of radio wave propagation.
Innovation Solution
A matrix arrangement of individual areas with patch electrodes and a common electrode, where the liquid crystal layer is sandwiched between substrates, allows for the adjustment of the dielectric constant by applying voltages to patch electrodes, thereby controlling the reflection phase and direction of radio waves, using a vertical electric field to optimize phase differences and minimize amplitude attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dielectric constant of liquid crystal is adjusted to maintain constant phase differences between adjacent reflection controllers, then the reflection direction control is achieved, but the amplitude attenuation increases and the control accuracy decreases
Solution Approach 1:
The liquid crystal layer is divided into multiple independently controllable regions corresponding to each reflection controller. By segmenting the liquid crystal into distinct zones with separate electrode control, the patent enables precise local adjustment of phase differences while minimizing overall amplitude attenuation through optimized voltage distribution across segments.
Solution Approach 2:
The patent dynamically changes the dielectric constant of the liquid crystal by applying different voltages to adjust the phase differences between adjacent reflection controllers. This parameter change approach allows real-time control of reflection directions while optimizing the voltage levels to minimize amplitude attenuation and improve control accuracy.
2Adaptability or versatility
If reflection controllers are arranged in one dimension or two dimensions with liquid crystal, then the intelligent reflecting surface is formed, but the adjustment range and flexibility of reflection direction control is limited
Solution Approach 1:
The patent transitions from traditional one-dimensional or two-dimensional electrode arrangements to a three-dimensional liquid crystal structure where voltage can be applied in multiple directions. This dimensional extension allows control of reflection directions in broader spatial ranges while maintaining manageable electrode complexity through vertical field utilization.
Solution Approach 2:
The common electrode structure serves multiple functions: it provides a reference potential for all patch electrodes, enables independent control of each liquid crystal region, and facilitates versatile reflection direction control. This multi-functional design increases adaptability while avoiding the complexity of multiple independent electrode sets.
3Measurement precision
If voltage is applied to patch electrodes to adjust dielectric constant, then phase control is improved, but the energy consumption increases
Solution Approach 1:
The patent employs periodic voltage application to the liquid crystal layer, where voltages are applied in cycles to achieve the desired phase differences. By using periodic rather than continuous voltage application, the system maintains precise phase control while reducing overall energy consumption through optimized duty cycles and voltage timing.
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 configuration enables precise control of radio wave reflection direction and phase differences, reducing amplitude attenuation, and allows for effective handling of radio wave environments, including those impacted by shielding objects in 5G communication systems.
Implementation Method 1
a dielectric constant of a liquid crystal needs to be adjusted such that phase differences between reflected radio waves are constant between adjacent reflection controllers
Implementation Method 2
a liquid crystal layer held between the first substrate and the second substrate and opposed to the plurality of patch electrodes
Implementation Method 3
An intelligent reflecting surface controlling a reflection direction of a radio wave using a liquid crystal has been studied
Data Source
AI summary
According to one embodiment, an intelligent reflecting surface includes a plurality of individual areas, each of the individual areas including a first area and one or more second areas, a connection area, a first substrate including a plurality of patch electrodes, a second substrate including a common electrode, the common electrode being located in the first area of each of the individual areas and the connection area and being opposed to the patch electrodes, and a liquid crystal layer held between the first substrate and the second substrate and opposed to the patch electrodes.