Liquid Crystal Phase Shifter Circuit for Stable Beam Scanning
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Solution Overview
Problem
Current liquid crystal phase shifters face poor control accuracy and stability in phase shift adjustments due to deviations in applied voltages across electrodes, especially under varying temperature conditions, affecting the precision of beam scanning in electromagnetic wave signals.
Innovation Solution
A liquid crystal phase shifter design incorporating a control circuit with a driving sub-circuit, switching sub-circuit, and reset sub-circuit, utilizing transistors and specific signal lines to ensure consistent voltage application to the first electrode, thereby stabilizing the applied voltage and enhancing control over phase shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a set voltage is directly input on first electrodes to adjust the applied voltage, then the phase shift amount can be adjusted, but deviations between actual applied voltages on different first electrodes and the set voltage occur, leading to poor control accuracy
Solution Approach 1:
The patent introduces a feedback mechanism where the actual applied voltage is monitored and fed back to the control circuit. The control circuit compares the actual voltage with the set voltage and adjusts the driving signal accordingly to compensate for deviations, ensuring that the actual applied voltage matches the set voltage within acceptable tolerances. This closed-loop control significantly improves control accuracy and stability.
Solution Approach 2:
The patent introduces an intermediate voltage adjustment circuit between the power supply and the first electrodes. This intermediary circuit includes voltage regulation components that can dynamically adjust the output voltage based on control signals, serving as a buffer to isolate voltage fluctuations from the electrodes and ensure stable voltage application.
2Adaptability or versatility
If the applied voltage is adjusted to change the dielectric constant of liquid crystal material, then the phase constant of electromagnetic wave changes, but temperature variations cause deviations in applied voltage, affecting phase shift precision
Solution Approach 1:
The patent employs temperature compensation by dynamically adjusting voltage parameters based on detected temperature conditions. When temperature varies, the control circuit modifies the driving voltage parameters (such as amplitude or pulse width) to compensate for the temperature-induced changes in liquid crystal material properties, thereby maintaining stable phase shift control across different temperature 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 design ensures accurate and stable phase shift control, improving the precision of beam scanning and reducing the impact of temperature variations on phase shift adjustments.
Implementation Method 1
A liquid crystal phase shifter changes the dielectric constant of the liquid crystal material by adjusting an applied voltage on a first electrode, causing the phase constant of the electromagnetic wave on a device to change
Data Source
AI summary
The present disclosure relates to a liquid crystal phase shifter, a method for operating the liquid crystal phase shifter and an antenna. The liquid crystal phase shifter includes a first substrate, a second substrate, a liquid crystal layer and at least one adjustment unit. The one of the at least one adjustment unit includes a first electrode, a second electrode and a control circuit. The control circuit comprises a driving sub-circuit, a switching sub-circuit and a reset sub-circuit. The driving sub-circuit is configured to input a voltage to the first electrode. The reset sub-circuit is configured reset a voltage of a control terminal of the driving sub-circuit.