Liquid Crystal Antenna Tuning Capacitors for Frequency Calibration
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Solution Overview
Problem
There is often a frequency deviation between the actual measurement result and the simulation result of the operating frequency range of a liquid crystal antenna array due to manufacturing process tolerances, affecting the gain and efficiency of the antenna array.
Innovation Solution
An antenna structure with tunable capacitors formed by overlapping first and second tuning electrodes on dielectric substrates, connected to a radiation component, and adjusted by control voltages to compensate for frequency deviations, utilizing a phase shifter for improved frequency calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a liquid crystal antenna array is manufactured using conventional processes, then the manufacturing cost and ease of manufacture are maintained, but frequency deviation occurs due to manufacturing process tolerances, affecting operating performance
Solution Approach 1:
The patent introduces tunable capacitors with adjustable capacitance values that can be dynamically configured to compensate for frequency deviations. The capacitor bank includes multiple capacitive elements that can be selectively connected or disconnected to adjust the total capacitance, enabling frequency tuning without changing the physical antenna structure. This dynamic adjustment mechanism resolves the contradiction by allowing frequency accuracy improvement while maintaining relatively simple antenna geometry.
Solution Approach 2:
The patent changes the electrical parameter (capacitance) of the antenna system by introducing variable capacitors connected to the radiation element. By adjusting the capacitance value through control signals, the resonant frequency of the antenna can be tuned to compensate for manufacturing tolerances. This parameter change approach improves frequency accuracy without requiring complex structural modifications to the antenna itself.
2Manufacturing precision
If tuning electrodes and control circuits are added to compensate for frequency deviation, then frequency accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the capacitance function into multiple discrete capacitive elements within the tunable capacitor bank. Each capacitive element can be independently controlled through separate control lines, allowing granular adjustment of total capacitance. This segmentation enables precise frequency calibration while using standard manufacturing techniques for creating multiple small components rather than one complex variable component.
Solution Approach 2:
The patent introduces control circuits as intermediary components that mediate between the input signal and the tunable capacitor bank. These control circuits receive control signals and selectively connect or disconnect capacitive elements based on the desired frequency adjustment. This intermediary layer simplifies the manufacturing process by using standard switching components and control logic rather than requiring complex integrated frequency tuning structures.
3Manufacturing precision
If the dielectric layer thickness is increased to improve frequency stability, then frequency deviation is reduced, but the antenna size and volume increase
Solution Approach 1:
The patent uses dynamically可调 capacitors to achieve frequency stability without increasing physical dimensions. The tunable capacitor bank can adjust its total capacitance value electronically to compensate for frequency deviations caused by manufacturing tolerances or environmental changes. This dynamic adjustment mechanism provides frequency stability equivalent to or better than thicker dielectric layers, but without increasing the antenna volume.
Solution Approach 2:
The patent changes the electrical parameter (capacitance) of the antenna system to achieve frequency stability rather than changing the physical parameter (dielectric thickness). By adjusting the capacitance value through the tunable capacitor bank, the resonant frequency can be precisely controlled without modifying the physical dimensions of the antenna structure, thereby maintaining compact size while improving frequency stability.
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 solution effectively eliminates frequency shifting caused by process tolerances, enhancing the gain and efficiency of the antenna by adjusting the dielectric constant of the liquid crystal layer to match the desired operating frequency.
Implementation Method 1
orthographic projections of each first tuning electrode and a corresponding second tuning electrode on the first dielectric substrate at least partially overlap with each other, to form a tunable capacitor electrically connected to the radiation component
Implementation Method 2
a first tunable dielectric layer between the first dielectric substrate and the second dielectric substrate
Data Source
AI summary
An antenna, a control method for an antenna, an antenna array and an electronic device are provided, and belong to the field of communication technology. The antenna includes a first tunable dielectric layer between the first dielectric substrate and the second dielectric substrate opposite to each other; a radiation component and at least one first tuning electrode on the first dielectric substrate; at least one second tuning electrode and a reference electrode layer on the second dielectric substrate; orthographic projections of the radiation component, the first tuning electrode and the second tuning electrode on the first dielectric substrate overlap with an orthographic projection of the reference electrode layer on the first dielectric substrate. Orthographic projections of each first tuning electrode and a corresponding second tuning electrode on the first dielectric substrate at least partially overlap with each other, to form a tunable capacitor electrically connected to the radiation component.