Liquid Crystal Phase Shifter Layout for Uniform Dielectric Thickness
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Solution Overview
Problem
Existing liquid crystal phase shifters face challenges in achieving uniformity of the dielectric layer thickness and efficient material usage, leading to performance deterioration and increased costs.
Innovation Solution
The phase shifter design incorporates a first and second substrate with a dielectric layer in between, featuring a phase shift region with overlapping regions for capacitor formation and a peripheral region with auxiliary structures to improve thickness uniformity and reduce material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If periodic patch capacitor loading is introduced into the upper glass substrate to adjust phase, then phase adjustment capability is achieved, but uniformity of dielectric layer thickness deteriorates
Solution Approach 1:
The phase shift function is segmented into multiple discrete capacitor units arranged in series along the signal path. Each capacitor consists of overlapping electrode regions, and by selectively applying voltages to different capacitor groups, precise phase control is achieved without requiring continuous variation of dielectric thickness across the entire substrate.
Solution Approach 2:
Electrode structures are designed with varying overlap areas at different locations to create capacitors with different capacitance values. The overlapping regions are strategically positioned and sized to provide the required phase shift range while maintaining uniform dielectric layer thickness across the entire substrate area.
2Measurement precision
If large area electrodes are used to improve capacitance control, then phase shift precision is improved, but amount of liquid crystal material increases
Solution Approach 1:
The electrode system is divided into multiple discrete capacitor units with smaller individual electrode areas. By arranging these small capacitors in series along the microwave signal path, the cumulative phase shift effect is achieved without requiring large electrode areas, thus reducing the total liquid crystal material volume while maintaining phase control precision.
Solution Approach 2:
Instead of increasing electrode area in the planar dimension to improve capacitance control, the solution transitions to utilizing the third dimension (depth/stacking) by creating multiple overlapping electrode pairs at different z-positions. This allows achieving the required capacitance values with smaller footprint areas, thereby reducing liquid crystal material consumption.
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 effectively enhances the uniformity of the dielectric layer thickness, reduces the amount of liquid crystal material needed, and improves the overall performance and cost-effectiveness of the phase shifter.
Implementation Method 1
orthographic projections of the first electrode and the second electrode on the first dielectric substrate are overlapped at least partially in the overlapping regions to form a plurality of capacitors
Implementation Method 2
a dielectric layer disposed between the first substrate and the second substrate
Data Source
AI summary
There is provided a phase shifter having a phase shift region and a peripheral region, and including a first substrate, a second substrate and a dielectric layer between such two substrates; the first substrate includes a first dielectric substrate, a first electrode and a first auxiliary structure; the second substrate includes a second dielectric substrate, a second electrode and a second auxiliary structure; the phase shift region includes overlapping regions; the first electrode and the second electrode are located in the phase shift region, and have orthographic projections, on the first dielectric substrate, overlapped at least partially in the overlapping regions; the first auxiliary structure is in the peripheral region and on a side, close to the dielectric layer, of the first dielectric substrate; the second auxiliary structure is in the peripheral region and on a side, close to the dielectric layer, of the second dielectric substrate.