Liquid Crystal Antenna Unit for Compact Low-Power Beam Steering
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Solution Overview
Problem
Conventional phased array antennas for 'Satcom on the move' applications face challenges in achieving high tracking precision and low power consumption while maintaining a compact size, which is not adequately addressed by mechanical scanning antennas.
Innovation Solution
A liquid crystal antenna unit comprising a first and second substrate with a liquid crystal layer, a transmission line, and antenna oscillators configured to couple electromagnetic waves, where the second antenna oscillator and ground electrode are arranged to form a directional radiator, enabling phase shifting and amplitude gain enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional phased array antenna is used, then tracking precision is improved, but device size and power consumption are not optimized
Solution Approach 1:
The patent changes the physical state of the antenna elements from solid mechanical structures to liquid crystal material, which can dynamically alter its electromagnetic properties. The liquid crystal layer's dielectric constant can be changed by applying voltage, enabling phase and amplitude control without mechanical movement, thus reducing size while maintaining tracking precision
Solution Approach 2:
The patent replaces mechanical scanning mechanisms with electromagnetic field control using liquid crystal materials. Instead of physically moving antenna elements or reflectors, the system uses voltage-controlled liquid crystal phase shifters to electronically steer beams, eliminating mechanical components and reducing overall antenna size
2Measurement precision
If a conventional phased array antenna is used, then tracking precision is improved, but power consumption increases
Solution Approach 1:
The liquid crystal phase shifters use periodic voltage switching to control the phase and amplitude of electromagnetic waves. By applying alternating voltage to the liquid crystal layer, the system can dynamically adjust beam direction and focus without continuous high power consumption, as the liquid crystal maintains its state between switching cycles
Solution Approach 2:
The patent utilizes the voltage-dependent dielectric constant of liquid crystal materials to control electromagnetic wave propagation. By changing the voltage parameter applied to the liquid crystal layer, the system achieves phase and amplitude modulation with low power consumption, as liquid crystals require minimal energy to maintain their oriented state once switched
3Device complexity
If mechanical scanning antenna is used, then structure is simpler, but tracking precision and response time deteriorate
Solution Approach 1:
The patent replaces mechanical scanning with electronic beam steering using liquid crystal phase shifters. The system maintains relative structural simplicity while achieving superior tracking precision through voltage-controlled phase modulation of electromagnetic waves, eliminating the need for mechanical movement components
4Device complexity
If mechanical scanning antenna is used, then structure is simpler, but response time increases
Solution Approach 1:
The patent eliminates mechanical scanning components and uses liquid crystal phase shifters for electronic beam steering. The liquid crystal material responds to voltage changes within milliseconds, providing fast response time while maintaining structural simplicity through integration of the phase shifters into the antenna substrate
Solution Approach 2:
The patent uses dynamically controllable liquid crystal materials that can rapidly change their electromagnetic properties in response to applied voltage. This dynamic control enables fast beam steering and focusing without mechanical movement, achieving quick response times while keeping the overall structure simple and integrated
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 liquid crystal antenna unit achieves improved amplitude gain and compact size with reduced power consumption, outperforming conventional patch antennas in terms of gain and size, while enabling efficient beam scanning and forming.
Implementation Method 1
a liquid crystal layer between the first substrate and the second substrate
Implementation Method 2
the first antenna oscillator is configured to couple an electromagnetic wave between the two poles and the transmission line at the gap
Data Source
AI summary
A liquid crystal antenna unit and a liquid crystal phased array antenna are provided. The liquid crystal antenna unit includes: a first substrate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, a transmission line on a first surface and extending in a first direction along the first surface, a first antenna oscillator on the first surface and arranged as an elongated dipole extending in a second direction along the first surface, a second antenna oscillator on a surface of the second substrate distal to the first substrate and at a position corresponding to the first antenna oscillator, and a ground electrode on a surface of the first substrate distal to the second substrate.