Liquid Crystal Phase Shifter for Low Power Microwave Systems
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Solution Overview
Problem
Existing phase shifters in microwave systems face challenges with high power requirements, significant losses during operation, and high fabrication costs, while seeking improvements in phase shifting capabilities.
Innovation Solution
A liquid crystal (LC) layer-based phase shifter apparatus with a bias line coupled to an electrode, where the LC layer fills a compartment within a waveguide structure, utilizing alignment chemical coatings to orient LC molecules for efficient permittivity tuning, and a method for fabricating the phase shifter using multi-layer printed circuit board techniques to integrate with substrate integrated waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If active components such as transistors and diodes are used in phase shifters, then phase shifting capability is achieved, but power consumption increases and losses occur during operation
Solution Approach 1:
The patent replaces active electronic components (transistors, diodes) with a passive liquid crystal-based phase shifting mechanism. The liquid crystal layer, when subjected to an electric field, changes its permittivity to alter the phase of microwave signals without requiring active power consumption or generating significant losses, thus resolving the contradiction between achieving phase shifting capability and minimizing power consumption and operational losses.
2Ease of manufacture
If conventional phase shifter technologies are used, then phase shifting is achieved, but fabrication costs increase
Solution Approach 1:
The patent utilizes the tunable permittivity parameter of liquid crystal materials to achieve phase shifting. By applying different voltages to the liquid crystal layer, the permittivity changes, which in turn adjusts the phase of the microwave signal. This parameter-based approach allows for cost-effective fabrication using standard waveguide structures combined with liquid crystal compartments, avoiding the need for expensive active components while maintaining precise phase control.
3Adaptability or versatility
If liquid crystal is used to fill the compartment, then permittivity tuning capability is achieved, but molecular alignment control becomes necessary
Solution Approach 1:
The patent applies alignment chemicals to the compartment surfaces before filling with liquid crystal. These pre-applied alignment layers establish the initial molecular orientation of the liquid crystal, ensuring proper permittivity tuning behavior when voltage is applied. This preliminary action simplifies the overall device structure by eliminating the need for complex real-time alignment control mechanisms, as the alignment is established during fabrication.
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 achieves low power consumption, reduced losses, and enhanced phase tuning range with lower fabrication costs, enabling efficient microwave signal processing and integration with waveguides.
Implementation Method 1
A phase shifter apparatus includes a liquid crystal (LC) layer... where the LC layer fills a compartment... utilizing alignment chemical coatings to orient LC molecules for efficient permittivity tuning
Implementation Method 2
A bias line is coupled to the electrode... in the absence of an applied static electric field, align molecules in an orientation that is parallel to a plane of the electrode
Implementation Method 3
At least one alignment chemical coating may be applied on at least one surface of the compartment. The at least one alignment chemical coating may be selected to, in the absence of an applied static electric field, align molecules in an orientation that is parallel to a plane of the electrode
Data Source
Figure 1A
Figure 1B~1C
Figure 1D~1E
AI summary
A phase shifter and a method of making a phase shifter are disclosed herein. The phase shifter may include a housing, a dielectric, an electrode, and a liquid crystal layer. The housing includes first, second, third, and fourth conductive walls, each conductive wall being opposite one of the other walls. The dielectric is situated within the housing and defines a compartment within the housing. The electrode is aligned with the compartment. The liquid crystal layer fills the space of the compartment. A bias line is coupled to the electrode. The phase shifter may be integrated with as substrate integrated waveguide.