Liquid Crystal Reflector Electrode Layout for Wave Direction Control
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Solution Overview
Problem
Existing radio wave reflecting devices struggle to efficiently control the direction of reflection, particularly in areas with challenging topography like between high-rise buildings, due to the need for voltage application and wiring to alter the dielectric constant of liquid crystal layers.
Innovation Solution
A reflecting device design featuring common electrodes arranged in a matrix, bias electrodes overlapping these, and a liquid crystal layer between them, with common wirings of half the effective wavelength, allowing individual control of the dielectric constant and phase of reflected waves through bias voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage is applied to the liquid crystal layer to change the dielectric constant, then the directivity of the reflected wave can be varied, but wiring for bias electrode and common electrode becomes necessary, increasing device complexity
Solution Approach 1:
The patent combines the bias electrode and common electrode into a single electrode structure, eliminating the need for separate wiring systems. This merging approach maintains the ability to control liquid crystal orientation while significantly reducing wiring complexity and device structure complexity.
Solution Approach 2:
The single electrode is designed to serve multiple functions: it acts as both the bias electrode and common electrode simultaneously. This multi-functionality eliminates the need for separate wiring for each electrode type, reducing overall device complexity while maintaining full control capability over the liquid crystal layer.
2Measurement precision
If common electrodes are arranged in matrix with bias electrodes, then precise directional control is achieved, but the wiring required to connect these electrodes increases device complexity
Solution Approach 1:
By merging the bias electrode and common electrode into a single electrode structure arranged in a matrix, the patent maintains precise directional control capability while eliminating the complex wiring that would be required to connect separate bias and common electrodes for each matrix element.
Solution Approach 2:
The patent changes the electrical configuration parameter from separate bias and common electrodes to a single integrated electrode, allowing the same matrix arrangement to achieve precise control without the wiring complexity that would result from maintaining separate electrode systems.
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
Enables precise control of the reflected wave direction by altering the dielectric constant of the liquid crystal layer, minimizing reflection losses and maintaining consistent potential across common electrodes, thus enhancing directional control and reducing interference.
Implementation Method 1
the dielectric constant anisotropy of the liquid crystal material can be used, making it possible to vary the directivity of the reflected wave
Implementation Method 2
it is possible to vary both the phase and the directivity of a reflected wave by applying a voltage to the liquid crystal layer
Implementation Method 3
A reflecting device has the function of reflecting the incident wave in a predetermined direction
Data Source
AI summary
A reflecting device in an embodiment according to the present invention includes common electrodes arranged in a matrix at a distance in a first direction and a second direction intersecting the first direction, bias electrodes arranged overlapping the common electrodes in a planar view, a liquid crystal layer between the common electrodes and the bias electrodes, and common wirings connecting adjacent common electrodes among the common electrodes. Each of the common wirings has a length of half an effective wavelength λg when a radio wave of a specific wavelength λ propagates through the liquid crystal layer.