Liquid Crystal Spatial Filter With Shared-Electrode Frequency Tuning
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Solution Overview
Problem
Conventional spatial filters have fixed frequency characteristics and difficulty in controlling individual units, limiting their practical application and adaptability, especially in scenarios with increased units and electromagnetic interference.
Innovation Solution
A spatial filter design with intersecting first and second electrodes on substrates, utilizing a tunable dielectric layer, particularly a liquid crystal layer, allows for adjustable resonance frequencies by applying voltages to electrodes, enabling independent control of each resonant unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of units in the spatial filter array is increased, then the filtering coverage and practical application value are improved, but the difficulty of arranging control lines and controlling individual units increases significantly
Solution Approach 1:
The patent merges the control functions by making adjacent resonant units share common first and second electrodes. This allows multiple resonant units to be controlled through shared control lines, significantly reducing the number of control lines needed as the array size increases, while maintaining the ability to individually tune each resonant unit's resonance frequency.
Solution Approach 2:
The shared electrodes serve multiple functions: they act as control electrodes for adjacent resonant units simultaneously. Each electrode is universally used to control the dielectric constant of liquid crystal layers in multiple neighboring resonant units, enabling efficient control of large arrays with minimal control lines.
2Ease of manufacture
If conventional FSS resonance mechanism is used, then the manufacturing process is simple, but the operating frequency band is fixed and cannot be adjusted after manufacturing
Solution Approach 1:
The patent introduces dynamic adjustability by replacing fixed dielectric materials with liquid crystal materials whose dielectric constant can be changed by applying voltages. This allows the resonance frequency of each resonant unit to be dynamically tuned after manufacturing, transforming the spatial filter from a static to a dynamic system while maintaining relatively simple manufacturing processes.
Solution Approach 2:
The patent changes the physical parameter (dielectric constant) of the liquid crystal layer through voltage application. By controlling the dielectric constant of the liquid crystal material in each resonant unit, the resonance frequency can be adjusted, enabling flexible frequency band selection without changing the physical structure of the resonant units.
3Device complexity
If integral tuning is used, then the device complexity is reduced, but the frequency selectivity and filtering precision are insufficient
Solution Approach 1:
The patent segments the control structure by enabling independent control of each resonant unit's frequency while maintaining shared electrode infrastructure. This segmentation allows precise frequency selection for specific resonant units without requiring complex individual control lines, achieving both simplicity and precision simultaneously.
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 filter achieves flexible frequency tuning, improved filtering performance, and reduced electromagnetic interference, with enhanced adaptability and control over filtering characteristics.
Implementation Method 1
a liquid crystal layer in the dielectric layer; and a first alignment layer on a side of a layer, where the at least one first electrode is located, close to the liquid crystal layer; and a second alignment layer on a side of a layer, where the at least one second electrode is located, close to the liquid crystal layer
Implementation Method 2
The filtering characteristics of the conventional FSS are mainly based on a resonance mechanism of the FSS, with an operating wavelength depending on a period length between units or a resonant frequency of the unit itself
Data Source
AI summary
A spatial filter, a driving method thereof and an electronic device are provided, and belong to the field of wireless communication technology. The spatial filter of the present disclosure includes at least one filter structure; wherein each filter structure includes a first substrate, a second substrate opposite to the first substrate, and a dielectric layer between the first substrate and the second substrate; wherein the first substrate includes a first dielectric substrate and at least one first electrode on a side of the first dielectric substrate close to the dielectric layer; the second substrate includes a second dielectric substrate and at least one second electrode on a side of the second dielectric substrate close to the dielectric layer; and the at least one first electrode intersects with the at least one second electrode, which defines at least one resonant unit configured to filter an electromagnetic wave.