Liquid Crystal Reflecting Surface for Selective Radio Wave Steering

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Solution Overview

Problem

Existing technologies lack the ability to selectively reflect and control the direction of radio waves with controllable reflective characteristics, particularly in the frequency range of 400 MHz to 50 GHz, which is crucial for efficient communication systems.

Innovation Solution

An intelligent reflecting surface utilizing a liquid crystal layer with controlled permittivity, comprising patch and sub-patch electrodes, orientation films, and a counter electrode, allows for the selective reflection and direction control of radio waves by adjusting the electric field applied to the liquid crystal layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a liquid crystal layer with electrodes is used to control radio wave reflection, then the reflective characteristics become controllable, but the device structure becomes complex

Engineering Contradiction:

Improvecontrollable reflective characteristicsVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The liquid crystal layer is divided into multiple independent pixel regions, each controlled by separate electrode pairs (first and second electrodes). This segmentation allows independent control of reflective characteristics in each pixel, enabling directional control and selective frequency reflection without requiring a monolithic complex structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a vertical dimension to control by utilizing the liquid crystal layer's ability to change orientation in the thickness direction. By applying voltages to electrode pairs, the liquid crystal molecules can be oriented vertically or horizontally, creating a third dimension of control beyond just planar electrode patterns

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If multiple electrodes are used to control liquid crystal orientation, then radio wave direction control is achieved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveradio wave direction controlVSAvoidelectrode alignment precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The electrode system is segmented into multiple independent first electrodes and second electrodes that can be arranged in a matrix pattern. This segmentation allows for more flexible layout designs where electrodes can be positioned with standard pitch distances, reducing the need for high-precision custom alignment while still achieving fine directional control through selective activation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first and second electrodes serve multiple functions: they act as both control electrodes for liquid crystal orientation and as reference electrodes for voltage application. This multi-functionality reduces the total number of separate components needed and simplifies the manufacturing process by using identical electrode structures throughout the device

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 the intelligent reflecting surface to selectively reflect radio waves of specific frequencies while blocking others, preventing interference and signal degradation, thereby enhancing communication efficiency.

Implementation Method 1

Since liquid crystal molecules have anisotropic permittivity, the permittivity of the liquid crystal layer containing liquid crystal molecules can be controlled by adjusting the electric field applied to the liquid crystal layer

Methodology Applied

Scientific EffectAnisotropic permittivity: Dielectric Permittivity

Implementation Method 2

the permittivity of the liquid crystal layer containing liquid crystal molecules can be controlled by adjusting the electric field applied to the liquid crystal layer to control the orientation of the liquid crystal molecules

Methodology Applied

Scientific EffectElectric field control: Electric Field

Implementation Method 3

The first orientation film is located between the liquid crystal layer and the patch electrode and between the liquid crystal layer and the sub-patch electrode. The second orientation film is located between the liquid crystal layer and the counter electrode

Methodology Applied

Scientific EffectLiquid crystal orientation: Liquid Crystals

Data Source

PatentUS20260018800A1Intelligent reflecting surface

Publication Date: 2026.01.15 JAPAN DISPLAY INC

AI summary

An intelligent reflecting surface includes a plurality of radio-wave reflection elements. Each of the plurality of radio-wave reflection elements includes a patch electrode, a sub-patch electrode, a counter electrode, a first orientation film, and a second orientation film. The sub-patch electrode is electrically insulated from the patch electrode. The counter electrode opposes the patch electrode and the sub-patch electrode via a liquid crystal layer. The first orientation film is located between the liquid crystal layer and the patch electrode and between the liquid crystal layer and the sub-patch electrode. The second orientation film is located between the liquid crystal layer and the counter electrode.