Liquid Crystal Phase Shifter Layout for Precise RF Phase Control
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Solution Overview
Problem
Existing liquid crystal phase shifters face challenges in efficiently adjusting the phase of radio frequency signals due to ineffective rotation of liquid crystal molecules, leading to precision issues and performance degradation.
Innovation Solution
A phase shifter design featuring a tunable dielectric layer between two substrates with transmission lines and electrode layers, utilizing a symmetrical arrangement of branches and openings to control electric fields for precise phase adjustment, reducing fringing fields, and optimizing branch and branch unit configurations to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If periodic patch capacitors and variable capacitors are used to adjust voltage difference and rotate liquid crystal molecules, then phase shifting capability is achieved, but manufacturing precision and performance stability deteriorate due to ineffective molecule rotation
Solution Approach 1:
The patent divides the continuous transmission line into multiple discrete branch units with different capacitance values. Each branch unit can be independently switched, allowing precise control of the total capacitance change. This segmentation enables accurate phase shifting by selectively activating specific branches rather than relying on imprecise liquid crystal molecule rotation.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the transmission line by switching between different branch units. Each branch unit has a predetermined capacitance value, and by combining different branches, the total capacitance can be precisely adjusted in discrete steps, achieving accurate phase control without depending on liquid crystal response precision.
2Adaptability or versatility
If liquid crystal molecules are rotated to change dielectric characteristics, then phase adjustment is achieved, but reliability deteriorates due to performance degradation
Solution Approach 1:
The patent replaces the mechanical/physical system of liquid crystal molecule rotation with an electrical switching system. Instead of relying on the slow and imprecise rotation of liquid crystal molecules in response to voltage changes, the invention uses electronic switches to directly connect or disconnect capacitor branches, providing immediate and reliable phase adjustment without performance degradation over time.
3Manufacturing precision
If complex electrode arrangements are used to control electric fields, then phase shifting precision improves, but device complexity increases
Solution Approach 1:
The patent combines multiple capacitor branches into a single integrated transmission line structure. The branches are connected in parallel to the main transmission line, merging multiple functional elements into one cohesive unit. This reduces device complexity compared to using separate electrode arrangements, while still achieving precise phase control through the selective switching of individual branches.
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 proposed design achieves improved phase shifting precision and bandwidth, with phase shifts exceeding 100°, while minimizing manufacturing complexity and enhancing fault tolerance through symmetrical and functional branch arrangements.
Implementation Method 1
a tunable dielectric layer between the first substrate and the second substrate
Implementation Method 2
achieves improved phase shifting precision and bandwidth, with phase shifts exceeding 100°
Implementation Method 3
a variable capacitor is used to adjust a voltage difference loaded on opposite surfaces of two metal plates to drive liquid crystal molecules to rotate
Implementation Method 4
drive liquid crystal molecules to rotate, so as to obtain different characteristics of the liquid crystal material
Implementation Method 5
periodic patch capacitors are introduced on an assembled upper glass substrate, and a variable capacitor is used to adjust a voltage difference
Data Source
AI summary
A phase shifter and an electronic device are provided and belong to the field of communication technology. The phase shifter includes opposite first and second substrates; a tunable dielectric layer therebetween. The first substrate includes a first dielectric substrate; first and second transmission lines on a side of the first dielectric substrate close to the tunable dielectric layer; the first transmission line includes a first main line and at least one first branch connected to a side of an extending direction thereof; the second transmission line includes a second main line and at least one second branch connected to a side of an extending direction thereof; the first and second main lines are arranged side by side with a first gap therebetween. The second substrate includes a second dielectric substrate and a first electrode layer on a side of the second dielectric substrate close to the tunable dielectric layer.