Liquid Crystal Antenna with Micro-Hole Resonant Cavities
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Solution Overview
Problem
Conventional antennas have limitations in miniaturization, frequency band width, and directional sensitivity, failing to meet the demands of current communication technology advancements.
Innovation Solution
An antenna structure incorporating a dielectric layer of liquid crystal between substrates with micro-hole units and electrodes, allowing for adjustable resonant frequencies and improved directivity through voltage control, enabling efficient electromagnetic wave transmission and reception across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional horn antenna, helical antenna, or dipole antenna are used, then the antenna structure is simple and easy to manufacture, but the antenna cannot achieve miniaturization, wide frequency band, and high gain simultaneously
Solution Approach 1:
The antenna is divided into multiple independent resonant cavity units arranged in an array, where each unit contains micro-hole structures that can be independently controlled. This segmentation allows different units to operate at different frequencies, achieving wide frequency band coverage while maintaining a compact overall structure
Solution Approach 2:
The antenna incorporates voltage-controlled liquid crystal materials and adjustable resonant cavity structures that can dynamically change their electromagnetic properties. By applying different voltages, the resonant frequency of each cavity unit can be tuned, enabling the antenna to adapt to different frequency bands and operational requirements
2Adaptability or versatility
If liquid crystal orientation is adjusted to change resonant frequency, then the frequency adaptability is improved, but the main lobe width increases and directivity decreases
Solution Approach 1:
Different regions of the antenna are designed with different local characteristics - the resonant cavity units are configured with specific micro-hole patterns and liquid crystal orientations that optimize both frequency tuning capability and beam directionality. Each local region maintains its own optimized properties while contributing to the overall antenna performance
Solution Approach 2:
The antenna introduces a new control dimension by using voltage-controlled liquid crystal orientation adjustment, which provides an additional degree of freedom for frequency tuning without compromising the spatial arrangement that determines beam direction. This separates the frequency control function from the directional control function
3Volume of moving object
If the antenna structure is miniaturized, then the device size is reduced for wearable applications, but the response time increases
Solution Approach 1:
The antenna incorporates micro-hole structures within the base substrate that create resonant cavities. These porous-like structures enable the miniaturized antenna to support multiple resonant modes, improving the electromagnetic field distribution and enhancing the response speed despite the reduced overall size
Solution Approach 2:
The antenna uses composite materials including voltage-controlled liquid crystal materials combined with dielectric layers and conductive elements. This composite structure enables fast response by leveraging the electro-optic properties of liquid crystals, which can rapidly adjust their orientation and electromagnetic properties when voltage is applied, compensating for the size reduction
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 antenna structure achieves reduced main lobe width, enhanced directivity, and sensitivity, with a smaller, lighter design that supports faster response times and flexible application, including in wearable devices.
Implementation Method 1
a variation of orientation of the liquid crystal will result in different effective dielectric constants and thus a variation of the capacitance, the orientation of liquid crystal between the transmitting patch and the grounded electrode can be adjusted by the voltage applied on the transmitting patch, so as to adjust the resonant frequency of the liquid crystal antenna
Implementation Method 2
each of the first micro-hole units comprises at least one micro-hole extending along a direction perpendicular to the first base substrate
Data Source
AI summary
Provided are an antenna structure, driving method thereof, and antenna system. The antenna structure includes a first base substrate, a second base substrate, a dielectric layer disposed between the first base substrate and the second base substrate, a plurality of first electrodes, and a plurality of second electrodes. The plurality of first electrodes are disposed apart at a side of the first base substrate facing to the dielectric layer, the plurality of second electrodes are disposed apart at a side of the second base substrate facing to the dielectric layer. The first base substrate includes a plurality of first micro-hole units, each of the first micro-hole units is disposed in a region between the adjacent first electrodes, each of the first micro-hole units includes at least one micro-hole extending a direction perpendicular to the first base substrate.