Liquid Crystal Reflecting Surface for Transparent 5G Beam Steering
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Solution Overview
Problem
Existing radio wave reflecting devices, particularly those used in 5G systems, face challenges in directing radio waves in a desired manner without obstructing scenery and maintaining high reflection characteristics, as they often have fixed reflection directions or opaque electrodes.
Innovation Solution
A reflecting device with a patch electrode and a common electrode separated by a liquid crystal layer, featuring through-holes and striped patterns, allows for adjustable radio wave reflection by altering the alignment of liquid crystal molecules, enhancing transparency and reflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes are used in the radio wave reflecting device, then high reflection characteristics are achieved, but the electrodes become opaque and obstruct the scenery
Solution Approach 1:
The electrode is designed with a mesh structure consisting of multiple conductive patterns arranged in a grid. This porous configuration allows visible light to pass through the electrode, providing transparency while maintaining electrical conductivity for radio wave reflection. The mesh structure enables the electrode to function as both a reflective element and a transparent component.
Solution Approach 2:
The electrode is formed by combining multiple conductive patterns (first and second patterns) with different orientations on the same substrate. This composite structure integrates multiple functional patterns into a single electrode layer, achieving both transparency through the mesh design and high reflection characteristics through the combined conductive network.
2Adaptability or versatility
If a constant dielectric constant is used in the radio wave reflecting device, then the structure is simple, but the radio wave reflection direction is fixed and cannot be adjusted
Solution Approach 1:
The dielectric constant of the liquid crystal layer is changed by applying voltage, which alters the alignment state of the liquid crystal molecules. This parameter change enables dynamic adjustment of the radio wave reflection direction without changing the physical structure of the device. The voltage-controlled dielectric constant variation provides adaptability while maintaining a relatively simple device structure.
Solution Approach 2:
The device transitions from a static configuration with fixed reflection direction to a dynamic system where the reflection direction can be adjusted in real-time by controlling the voltage applied to the liquid crystal layer. This dynamic capability allows the device to adapt to different operational requirements while using the same physical structure.
3Reliability
If opaque metal electrodes are used, then high reflection efficiency is achieved, but the device obstructs the view and cannot be used in applications requiring transparency
Solution Approach 1:
The mesh-shaped electrode structure creates pores or openings that allow visible light to pass through, providing transparency. Meanwhile, the conductive patterns within the mesh maintain the electrical properties necessary for efficient radio wave reflection. This porous design enables the device to be suitable for applications where both reflection efficiency and visual transparency are required.
Solution Approach 2:
The electrode structure exhibits local quality variations where the conductive patterns provide high reflection efficiency in specific regions, while the spaces between patterns allow light transmission. This local differentiation of properties enables the electrode to simultaneously achieve high reflection efficiency and transparency, expanding the device's applicability.
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 device achieves flexible radio wave directionality while maintaining high reflection efficiency and transparency, suitable for 5G applications without obstructing views.
Implementation Method 1
a phase shifter that utilizes changes in a dielectric constant due to the alignment state of liquid crystals
Implementation Method 2
utilizing the dielectric anisotropy of liquid crystals can change the reflection direction of radio waves by applying voltage to the liquid crystal
Implementation Method 3
a device that reflects radio waves, a liquid crystal meta-surface reflector that can change the reflection direction of radio waves
Data Source
AI summary
A reflecting device includes a patch electrode, a common electrode facing the patch electrode and separated from the patch electrode, and a liquid crystal layer between the patch electrode and the common electrode, wherein the patch electrode has a cross shape including a first rectangular pattern extending in a first direction and a second rectangular pattern extending in a second direction intersecting the first direction and intersecting the first rectangular pattern in a plan view, the common electrode has a first striped pattern extending in the first direction and a second striped pattern extending in the second direction and intersecting the first striped pattern in a plan view.