Liquid Crystal Antenna Assembly Phase Tuning
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Solution Overview
Problem
Existing antenna assemblies face challenges with phase and coupling errors, particularly in phase array antennas, which require complex and energy-consuming methods to compensate for phase angle discrepancies and signal attenuation when signals are not aligned.
Innovation Solution
The antenna assembly incorporates a periodic pattern of liquid crystal and dielectric members, where the permittivity of the liquid crystal members is altered by a bias voltage, allowing the antenna to tune to different phase angles and wavelengths, thereby reducing phase and coupling errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed dielectric fill is used in the antenna, then the antenna structure is simple and stable, but the antenna cannot be tuned to different phase angles and wavelengths
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed dielectric fill with liquid crystal members whose permittivity can be dynamically changed through applied voltage. This allows the antenna to be tuned to different phase angles and wavelengths by controlling the liquid crystal's electromagnetic properties via voltage bias, transforming a static structure into a dynamically adjustable system.
Solution Approach 2:
The patent implements parameter changes by utilizing the voltage-dependent permittivity of liquid crystal materials. By applying different voltage levels to the liquid crystal members, the effective permittivity of the antenna fill is changed, which in turn adjusts the phase angle and wavelength characteristics of the antenna without requiring physical reconfiguration.
2Measurement precision
If phase array antennas are used to compensate for phase errors, then signal reception accuracy is improved, but energy consumption and system complexity increase
Solution Approach 1:
The patent reduces energy consumption by changing the permittivity parameter of liquid crystal members through controlled voltage application. This approach requires significantly less energy compared to traditional phase array antennas that must actively adjust the phase of signals from multiple antenna elements. The liquid crystal's passive response to voltage provides phase adjustment without the continuous energy expenditure required by active phase shifters.
Solution Approach 2:
The patent extracts the phase error compensation function from the antenna radiation mechanism itself, rather than requiring separate phase array elements. By incorporating tunable liquid crystal members directly into the antenna structure, the phase adjustment capability is integrated into the fundamental radiation process, eliminating the need for additional antenna elements and their associated energy consumption.
3Reliability
If the antenna is pointed in a particular direction, then signal reception is maximized in that direction, but signals off-axis are attenuated or degraded
Solution Approach 1:
The patent applies dynamics by enabling real-time adjustment of the antenna's electromagnetic characteristics through voltage control of liquid crystal members. This allows the antenna to dynamically adapt its radiation and reception patterns, potentially broadening the effective reception angle or adjusting beam direction without physically moving the antenna structure, thereby improving both on-axis reliability and off-axis adaptability.
Solution Approach 2:
The patent implements multi-functionality by using the same liquid crystal members to simultaneously control multiple aspects of antenna performance, including phase angle, wavelength, and potentially beam direction. This single mechanism provides multiple functions that would otherwise require separate systems, allowing the antenna to maintain reliable signal reception across a broader range of angles and conditions.
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
This solution dynamically tunes the antenna to accept various phase angles and wavelengths, improving signal reception and transmission by modifying the effective permittivity and refractive index, thus enhancing the antenna's performance and reducing errors.
Implementation Method 1
A permittivity of each of the plurality of liquid crystal members changes based on application of a liquid crystal altering bias (e.g., a voltage bias) through the feed line
Implementation Method 2
To send a signal through an antenna, a bias voltage is applied through the feed line, which then radiates from the end of the feed line
Data Source
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AI summary
An antenna assembly (100) may include a ground shield (104) defining an interior chamber (110), a feed line (106) coupled to the ground shield (104) within the interior chamber (110), a plurality of dielectric members, and a plurality of liquid crystal members. Each of the plurality of liquid crystal members may be spaced apart from another of the liquid crystal members by at least one of the plurality of dielectric members.