Liquid Crystal Phase Shifter Electrode Overlap for Low Insertion Loss
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Solution Overview
Problem
Current phase shifters, such as ferrite and PIN diode phase shifters, suffer from large loss, long response time, and high power consumption, making them unsuitable for high-speed beam scanning and lightweight, low-power phased array systems.
Innovation Solution
A liquid crystal phase shifter is designed with a first and second substrate and a liquid crystal layer in between, featuring a main body structure and branch structures on the first substrate, where the second electrode overlaps the branch structures, allowing for voltage application to rotate liquid crystal molecules and change the dielectric constant, thereby shifting the phase of microwave signals with reduced transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ferrite or PIN diode phase shifters are used, then phase shifting function is achieved, but insertion loss increases and response time lengthens
Solution Approach 1:
The patent changes the material parameter from ferrite or PIN diode to liquid crystal material, which fundamentally alters the phase shifting mechanism. Liquid crystal molecules can be reoriented by electric fields to change the dielectric constant, achieving phase shifting with lower loss and faster response compared to ferrite or PIN diode-based approaches.
Solution Approach 2:
The patent replaces the mechanical or electronic switching mechanism of PIN diodes with an electric field-controlled liquid crystal reorientation mechanism. This substitution eliminates the need for high-current switching and reduces both insertion loss and response time by utilizing the electro-optic properties of liquid crystals.
2Use of energy by moving object
If traditional phase shifters are used, then phase control is achieved, but power consumption increases
Solution Approach 1:
The patent changes the operational parameter from high-current electronic switching to low-power electric field control. Liquid crystal phase shifters require only small voltages to reorient molecules, dramatically reducing power consumption while maintaining effective phase control through the electro-optic effect.
3Ease of manufacture
If conventional electrode structures are used, then simple manufacturing is achieved, but phase shifting efficiency decreases
Solution Approach 1:
The patent segments the electrode structure into multiple independent electrodes that can be independently controlled. This segmentation allows for more precise electric field distribution across the liquid crystal layer, improving phase shifting efficiency and reducing transmission loss while maintaining manufacturing simplicity through standard PCB fabrication techniques.
Solution Approach 2:
The patent implements local quality by having different electrode regions control different portions of the liquid crystal layer. This allows optimized electric field distribution where needed, improving phase shifting efficiency in critical regions while keeping the overall structure simple and manufacturable.
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 phase shifter achieves efficient phase shifting with reduced insertion loss and low power consumption, suitable for high-speed beam scanning and lightweight communication systems.
Implementation Method 1
allowing for voltage application to rotate liquid crystal molecules and change the dielectric constant, thereby shifting the phase of microwave signals
Implementation Method 2
change the dielectric constant, thereby shifting the phase of microwave signals
Data Source
AI summary
A liquid crystal phase shifter and an antenna are provided. The liquid crystal phase shifter includes first and second substrates opposite to each other, and a liquid crystal layer therebetween. The first substrate includes a first base plate and a first electrode thereon. The first electrode includes a main body structure on a side of the first base plate distal to the liquid crystal layer and at least one branch structure on a side of the first base plate proximal to the liquid crystal layer. The at least one branch structure is connected to the main body structure, and is spaced apart from each other in a lengthwise direction of the main body structure. The second substrate includes a second base plate and a second electrode thereon, and orthographic projections of the second electrode and the branch structure on the first base plate at least partially overlaps each other.