Variable Capacitor Electrode Layout for Independent Spacing Control
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Solution Overview
Problem
Existing capacitors face challenges in independently setting the distance between electrodes, leading to difficulties in optimizing the electric field magnitude and capacitance variability.
Innovation Solution
A variable capacitor design with a multilayer structure featuring insulation and dielectric layers, allowing independent control of electrode distances and electric field directions, utilizing materials like PVDF for high permittivity and oxide films for chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ground electrode, capacitance extraction electrode, and DC bias electrode are stacked in a predetermined direction through the dielectric layers, then the capacitor structure is simplified, but the distance between electrodes cannot be set independently
Solution Approach 1:
The capacitor is divided into multiple independent capacitor elements (first capacitor element and second capacitor element) with separate electrode pairs. The first electrode layer and fourth electrode layer form one capacitor element, while the second electrode layer sections and third electrode layer sections form another. This segmentation allows independent control of distances between different electrode pairs, resolving the contradiction between structural simplicity and manufacturing precision.
Solution Approach 2:
The invention transitions from a single-directional stacked structure to a multi-dimensional electrode arrangement. By placing electrode layers in different regions (first region, second region, third region) on the insulation layer and using a dielectric layer to bridge them, the design enables independent distance control in multiple spatial dimensions, allowing precise electrode spacing while maintaining overall structural organization.
2Reliability
If the distance between the ground electrode and DC bias electrode is increased, then the electric field magnitude is reduced, but the capacitance variability decreases
Solution Approach 1:
By creating separate capacitor elements with different electrode pairs, the invention allows one element to be optimized for high electric field magnitude (with appropriate electrode spacing) while another element can be optimized for capacitance variability. This segmentation enables independent optimization of conflicting parameters without compromise.
Solution Approach 2:
The invention changes the spatial arrangement parameters of multiple electrode layers, positioning them in different regions with controlled distances. This parameter optimization allows the electric field magnitude and capacitance variability to be independently tuned by adjusting the distance between specific electrode pairs while maintaining other design requirements.
3Adaptability or versatility
If a shorter distance is used between the ground electrode and capacitance extraction electrode, then the capacitance increases, but the electric field strength is reduced
Solution Approach 1:
The capacitor structure is segmented into multiple elements where different electrode pairs serve different functions. One element can have short electrode distances to maximize capacitance, while another element maintains appropriate distances to ensure sufficient electric field strength for dielectric breakdown prevention, resolving the trade-off between capacitance and electric field strength.
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
Enables higher capacitance variability and manufacturability by maintaining a strong electric field while ensuring electrode isolation, with improved resistance to processing chemicals.
Implementation Method 1
a dielectric layer at least partially arranged in at least one third region disposed on the insulation layer and interposed between the at least one first region and the at least one second region
Implementation Method 2
the insulation layer includes an oxide film that has resistance to chemicals used in the process of forming the upper layers of the insulation layer
Data Source
AI summary
In a variable capacitor, a first electrode layer is provided and an insulation layer is disposed on the first electrode layer. At least one second electrode layer section is arranged in at least one first region that is defined on the insulation layer. At least one third electrode layer section is arranged in at least one second region that is defined on the insulation layer. The at least one second region is disposed apart from the at least one first region. A dielectric layer is at least partially arranged in at least one third region disposed on the insulation layer and interposed between the at least one first region and the at least one second region. A fourth electrode layer is disposed on the dielectric layer.