Liquid Crystal Phase Shifter Electrode Layout for Larger Microwave Phase Shift
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Solution Overview
Problem
Existing liquid crystal phase shifters face challenges in achieving a sufficient phase shift of microwave signals due to the large inductance and resistance of ITO leads, which limits the change in capacitance and thus the phase shift.
Innovation Solution
The liquid crystal phase shifter design includes a first substrate with a microstrip electrode layer having a main body structure and branch structures, and a second substrate with a second electrode layer positioned in a peripheral region, allowing for a reduced length of conductive wires and lower inductance and resistance, thereby enhancing the phase shift capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO leads are used to connect electrode layers, then electrical conductivity is achieved, but inductance and resistance increase significantly
Solution Approach 1:
The patent extracts and removes the ITO leads from the system entirely. Instead of using ITO leads to connect the first and second electrode layers, the design positions the second electrode layer directly on the second substrate in a peripheral region, eliminating the need for separate conductive wire connections and thus removing the source of inductance and resistance.
Solution Approach 2:
The patent introduces the second substrate as an intermediary carrier that directly supports the second electrode layer. This intermediary structure eliminates the need for separate conductive connections, as the substrate itself serves as the mounting platform, thereby reducing the number of conductive interfaces and associated parasitic elements.
2Object-generated harmful factors
If conductive wire length is reduced, then inductance and resistance decrease, but manufacturing complexity increases
Solution Approach 1:
The patent merges the function of the second electrode layer support with the second substrate itself. By positioning the second electrode layer directly on the second substrate in a peripheral region, the design combines the structural support function and the electrical connection function into a single integrated configuration, eliminating separate conductive wire components.
Solution Approach 2:
The patent transitions from a three-dimensional wire connection approach to a two-dimensional planar configuration. By positioning the second electrode layer on the peripheral region of the second substrate, the design uses spatial arrangement in the planar domain rather than vertical wire connections, thereby reducing inductance and resistance without requiring complex wire routing.
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 achieves a larger phase shift of microwave signals by reducing the inductance and resistance of the conductive wires, ensuring a more significant change in capacitance and improved phase shifting performance.
Implementation Method 1
a liquid crystal layer between the first substrate and the second substrate
Implementation Method 2
ensuring a more significant change in capacitance
Data Source
AI summary
There is provided a liquid crystal phase shifter including first and second substrates opposite to each other, and a liquid crystal layer between the first and second substrates. The first substrate includes a first base plate and a first electrode layer at a side of the first base plate proximal to the liquid crystal layer. The second substrate includes a second base plate and a second electrode layer at a side of the second base plate proximal to the liquid crystal layer. The first electrode layer includes a main body structure having a first side and a second side opposite to each other with respect to an extension direction of the main body structure, and a plurality of branch structures connected to at least one of the first side and the second side of the main body structure. The second electrode layer includes a plurality of first fingers.