Liquid Crystal Radio Wave Absorber for Thin Transparent Tuning
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Solution Overview
Problem
Existing radio wave absorbers are difficult to make thin and transparent, which affects the visibility and functionality in spaces where electronic devices are arranged.
Innovation Solution
A radio wave absorption device utilizing a liquid crystal layer between electrodes, where the dielectric constant is adjusted by controlling voltages applied to the electrodes, allowing for variable impedance and frequency adjustment to absorb electromagnetic waves effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional radio wave absorbers are used, then radio wave absorption function is achieved, but the device becomes thick and opaque
Solution Approach 1:
The patent applies parameter changes by utilizing the voltage-dependent dielectric constant of liquid crystal. By adjusting the voltage applied to the liquid crystal layer, the dielectric constant changes, which in turn adjusts the impedance matching condition for radio wave absorption. This allows the same thin structure to effectively absorb radio waves across different frequencies without increasing thickness, resolving the contradiction between absorption effectiveness and device thinness.
Solution Approach 2:
The patent implements dynamics by making the dielectric constant of the liquid crystal layer adjustable through voltage control. This dynamic property allows the radio wave absorption device to adapt to different frequencies and conditions by changing the applied voltage, enabling effective absorption in a thin structure without requiring multiple fixed-thickness layers for different frequency ranges.
2Object-affected harmful factors
If conventional radio wave absorbers are used, then radio wave absorption function is achieved, but visibility is reduced
Solution Approach 1:
The patent uses parameter changes by exploiting the optical transparency properties of liquid crystal when no voltage is applied. In this state, the liquid crystal allows visible light to pass through, maintaining visibility. When voltage is applied, the dielectric constant changes to enable radio wave absorption. This dual-state property resolves the contradiction between absorption function and visibility by separating optical and radio wave interaction modes through voltage control.
3Ease of manufacture
If fixed impedance radio wave absorbers are used, then manufacturing is simplified, but frequency adjustment capability is limited
Solution Approach 1:
The patent applies parameter changes by using voltage-controlled dielectric constant adjustment in the liquid crystal layer. This allows the impedance of the absorption device to be tuned to match different frequencies without changing the physical structure or material composition. The manufacturing process remains simple with a fixed structure, while the frequency adaptability is achieved through electrical parameter adjustment, resolving the contradiction between manufacturing simplicity and frequency versatility.
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 can be made thin and transparent while effectively absorbing electromagnetic waves across a range of frequencies, correcting manufacturing variations and improving visibility and performance.
Implementation Method 1
a liquid crystal layer arranged between the first electrode and the fourth surface, wherein a dielectric constant of the liquid crystal layer changes according to a voltage applied between the first electrode and the second electrode
Data Source
AI summary
A radio wave absorption device includes a first substrate including a first surface and a second surface opposite the first surface, a first electrode arranged on the first surface, a second substrate including a third surface and a fourth surface opposite the third surface, a second electrode arranged on the third surface, a liquid crystal layer arranged between the first electrode and the fourth surface, and a control circuit configured to supply a first voltage to the first electrode, a second voltage to the second electrode, and adjustably to control the propagation length of the radio waves to be absorbed according to the first voltage and the second voltage.