Patch Electrode Reflector Layout for Precise Wave Steering
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Solution Overview
Problem
Existing phased array antenna devices struggle to efficiently control the direction of reflected radio waves due to limitations in phase shifter technology, particularly in achieving precise phase changes and minimizing wave attenuation.
Innovation Solution
A reflecting device is designed with a configuration of alternating first and second patch electrodes of different sizes, a ground electrode, and a liquid crystal layer. This configuration allows for the control of the dielectric constant of the liquid crystal layer, enabling precise adjustment of the phase of reflected waves and directing them to specific angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phase shifter using liquid crystal orientation is used to control the direction of reflected radio waves, then the directionality of the antenna can be adjusted, but wave attenuation increases and phase change precision decreases
Solution Approach 1:
The patent changes the fundamental parameter of phase control from liquid crystal orientation (which causes attenuation) to patch electrode size variation (which controls phase through electrical path length differences). By varying the size of patch electrodes, the phase of reflected waves is adjusted without the energy losses associated with liquid crystal phase shifters, thus resolving the contradiction between adaptability and energy loss.
2Adaptability or versatility
If a phase shifter using liquid crystal orientation is used to control the direction of reflected radio waves, then the directionality of the antenna can be adjusted, but phase change precision is limited
Solution Approach 1:
The patent transitions from continuous parameter adjustment (liquid crystal orientation angles) to discrete parameter control (patch electrode sizes). By designing patch electrodes with specific size variations, precise phase changes are achieved through controlled electrical path length differences, providing more accurate and reliable phase control compared to liquid crystal-based methods.
3Measurement precision
If multiple patch electrodes of different sizes are arranged alternately, then phase control precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the reflecting surface into multiple discrete patch electrodes of different sizes arranged in an alternating pattern. This segmentation allows independent control of phase for different regions, achieving precise phase control while maintaining a relatively simple overall structure. Each patch electrode acts as an independent phase control element, simplifying the control mechanism compared to continuous adjustment methods.
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 solution effectively enhances the control over the direction of reflected radio waves, achieving significant phase changes and minimizing wave attenuation, thus improving the overall performance of phased array antenna devices.
Implementation Method 1
The phase of the reflected wave can then be changed by adjusting the dielectric constant of the liquid crystal layer for each antenna element
Data Source
AI summary
A reflecting device includes a plurality of first patch electrodes, a plurality of second patch electrodes having a size different from a size of the first patch electrodes, a ground electrode opposing the plurality of first patch electrodes and the plurality of second patch electrodes and separated from the plurality of first patch electrodes and the plurality of second patch electrodes, and a liquid crystal layer between the plurality of first patch electrodes and the plurality of second patch electrodes and the ground electrode, wherein the plurality of first patch electrodes and the plurality of second patch electrodes are arranged alternately in a first direction or a second direction intersecting the first direction, and each first patch electrode is adjacent to each second patch electrode in the first direction or the second direction.