Self-Shielding Capacitor Unit for Parasitic Stability
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Solution Overview
Problem
Existing capacitors suffer from poor stability due to parasitic effects caused by metal strip structures, leading to instability and increased dielectric loss, which affects their quality factor and linearity.
Innovation Solution
A capacitor unit with a self-shielding structure is designed, featuring a conductive cavity and a conductive core connected by via holes, isolated by an oxide or insulation layer, which reduces external electromagnetic coupling and enhances stability, allowing for flexible configuration and high compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal strip structures are used in existing capacitors, then the capacitor can be manufactured with standard processes, but parasitic effects are generated causing poor stability
Solution Approach 1:
The capacitor structure is divided into multiple independent metal layers (first metal layer, second metal layer, third metal layer) with distinct functions. The first and third metal layers form the capacitor plates, while the second metal layer serves as a shielding layer, segmenting the electromagnetic field interactions to reduce parasitic effects.
Solution Approach 2:
A dielectric layer is introduced as an intermediary between the first and second metal layers, and another dielectric layer between the second and third metal layers. This intermediary structure isolates the shielding layer from direct electrical contact with the capacitor plates while maintaining electromagnetic coupling for parasitic reduction.
2Device complexity
If multiple metal strips are evenly arranged horizontally and vertically, then the capacitor structure is simple, but mutual coupling generates parasitic effects
Solution Approach 1:
The solution transitions from a two-dimensional planar arrangement of metal strips to a three-dimensional stacked structure with vertical separation. Multiple metal layers are arranged vertically with dielectric spacing, adding the vertical dimension to reduce mutual coupling while maintaining horizontal simplicity.
Solution Approach 2:
The metal layers are designed with asymmetric functionality: the first and third layers have identical capacitor plate structures, while the second layer has a different shielding structure. This asymmetric arrangement optimizes the balance between capacitance generation and parasitic reduction.
3Reliability
If a self-shielding structure is implemented, then parasitic effects are reduced and stability improves, but the device complexity increases
Solution Approach 1:
The second metal layer serves multiple functions: it acts as a shielding layer to reduce parasitic effects, provides structural support between the capacitor plates, and maintains electrical isolation through the dielectric layers. This multi-functionality reduces the need for additional dedicated shielding components.
Solution Approach 2:
The shielding function is merged with the structural framework of the capacitor. The second metal layer is integrated into the same fabrication process as the capacitor plates, combining the shielding structure with the existing capacitor architecture rather than adding separate shielding components.
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 self-shielding structure improves capacitor stability, increases horizontal capacitance, and reduces dielectric loss, resulting in a high-quality factor and high-linearity capacitor unit suitable for precise control circuits.
Implementation Method 1
a capacitor unit includes: a conductive cavity, where an accommodation space is set longitudinally through in the conductive cavity; and a conductive core, where a first part of the conductive core and a second part of the conductive core are connected by using a via hole
Implementation Method 2
the conductive cavity is isolated from the conductive core by using an oxide layer or an insulation layer
Data Source
AI summary
Embodiments of this application provide a capacitor unit, an integrated capacitor, and a resonance unit. The capacitor unit includes: a conductive cavity, where an accommodation space is set longitudinally through in the conductive cavity; and a conductive core, where a first part of the conductive core and a second part of the conductive core are connected by using a via hole, the first part of the conductive core is located above or below the conductive cavity, and the second part of the conductive core is located in the accommodation space of the conductive cavity; and the conductive cavity is isolated from the conductive core by using an oxide layer or an insulation layer. The embodiments of this application can reduce impact from the outside on the capacitor unit, and therefore stability of the capacitor unit can be improved.