Reflect Array Phase Control via Liquid Crystal Dielectric
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Solution Overview
Problem
The introduction of the 5G communication standard using millimeter-wave frequencies faces challenges in propagating radio waves around obstacles, leading to a narrow communication area in urban environments, as metal reflectors require mechanical elements for directional control, resulting in large and expensive equipment.
Innovation Solution
A reflect array is developed using a patch electrode, a ground electrode, a liquid crystal layer, and a dielectric substrate, where the thickness of the dielectric substrate is equivalent to a quarter of the radio wave wavelength, allowing for dynamic control of radio wave reflection without mechanical elements, utilizing the dielectric anisotropy of the liquid crystal layer to adjust the phase of reflected waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a metal reflecting plate is used as a reflector, then the reflection of radio waves is achieved, but the cross-sectional area for straight traveling radio wave decreases when the reflection angle is increased
Solution Approach 1:
The patent replaces the mechanical rotation system with an electronic phase control system. Instead of physically rotating a metal reflector to change the reflection angle, the invention uses multiple fixed reflectors with independently controllable phases. By adjusting the phase difference between adjacent reflectors, the reflection direction is electronically controlled without mechanical movement, thereby maintaining a constant cross-sectional area while achieving variable reflection angles.
Solution Approach 2:
The patent divides a single large metal reflector into multiple smaller reflector elements arranged in an array. Each element can be independently controlled with a different phase shift. This segmentation allows the system to maintain a large overall cross-sectional area while electronically steering the reflected beam in different directions by adjusting the phase of individual elements.
2Adaptability or versatility
If mechanical elements are included to dynamically control the reflection direction, then the reflection direction can be adjusted, but the equipment becomes large and expensive
Solution Approach 1:
The patent eliminates mechanical rotation mechanisms by using an electronic phase array system. Multiple fixed reflectors are equipped with phase shifters that can be electronically controlled to change the reflection direction. This substitution of mechanical systems with electronic control reduces the equipment size, removes the need for large rotating structures, and lowers overall system cost while maintaining dynamic direction control capability.
Solution Approach 2:
The patent implements dynamic control through electronic phase modulation rather than mechanical movement. The phase of each reflector element can be dynamically adjusted in real-time to change the reflection direction. This dynamic electronic control provides adaptability without requiring large mechanical components or complex moving parts.
3Loss of energy
If the thickness of the dielectric substrate is equivalent to a quarter of the wavelength, then the amplitude of reflected waves is maintained high, but the structure becomes more complex
Solution Approach 1:
The patent optimizes the dielectric substrate thickness to be exactly one-quarter of the radio wave wavelength. This specific parameter value creates a quarter-wave transformer effect that maximizes the amplitude of reflected waves by minimizing energy loss. By precisely controlling this dimensional parameter, the system achieves high reflection efficiency without requiring additional complex components or structures.
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 solution enables efficient control of radio wave directionality, reduces equipment size and cost, and maintains high amplitude of reflected waves, effectively extending communication coverage in urban areas by dynamically adjusting the reflection direction of millimeter-wave frequencies.
Implementation Method 1
a phase shifter utilizing a change in a dielectric constant depending on the alignment state of a liquid crystal
Implementation Method 2
utilizing the dielectric anisotropy of the liquid crystal layer to adjust the phase of reflected waves
Implementation Method 3
A reflect array in an embodiment according to the present invention includes a patch electrode, a ground electrode arranged opposite the patch electrode and spaced apart from the patch electrode
Implementation Method 4
A thickness T from a surface on the liquid crystal layer side of the patch electrode to a surface on the opposite side of the dielectric substrate from the patch electrode has a thickness equivalent to a quarter of a wavelength of a radio wave irradiated to the patch electrode
Data Source
AI summary
A reflect array includes a patch electrode, a ground electrode arranged opposite the patch electrode and spaced apart from the patch electrode, a liquid crystal layer between the patch electrode and the ground electrode, and a dielectric substrate on an opposite side of the patch electrode from the liquid crystal layer. A thickness T from a surface on the liquid crystal layer side of the patch electrode to a surface on the opposite side of the dielectric substrate from the patch electrode has a thickness equivalent to a quarter of the wavelength of the radio wave irradiated to the patch electrode.