Composite Dielectric Capacitor Structure for Stable High-Frequency Capacitance
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Solution Overview
Problem
Existing multi-layer ceramic capacitors (MLCC) are too thick, leading to difficulties in miniaturizing integrated circuit packaging, and their capacitance values are unstable due to high dielectric loss and frequency-dependent natural frequency issues, especially when operated at high frequencies.
Innovation Solution
A capacitor design incorporating a first and second electrode with a first and second dielectric layer, where the first dielectric layer is inorganic and the second is organic, allowing for precise control of capacitance and frequency response by adjusting the groove geometry and dielectric layer composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a multi-layer ceramic capacitor (MLCC) is used with conventional thick structure, then the capacitor provides sufficient capacitance, but the overall package size cannot be miniaturized
Solution Approach 1:
The capacitor structure is segmented into multiple thin dielectric layers (first dielectric layer and second dielectric layer) stacked between electrodes, replacing the conventional single thick dielectric layer. This segmentation enables miniaturization while maintaining capacitance through increased layer count, directly resolving the contradiction between size reduction and capacitance stability.
Solution Approach 2:
The patent employs composite dielectric materials consisting of an inorganic dielectric layer and an organic dielectric layer. The inorganic dielectric provides high permittivity for compact design, while the organic dielectric fills gaps and improves overall dielectric performance. This composite approach maintains capacitance stability in the thinned structure, resolving the reliability concern during miniaturization.
2Volume of moving object
If a thin film dielectric layer is used for miniaturization, then the capacitor size is reduced, but dielectric loss increases due to poor flatness
Solution Approach 1:
The organic dielectric layer serves as a complementary material to the inorganic dielectric layer, filling voids and improving flatness of the thin film structure. This composite approach reduces dielectric loss by eliminating air gaps and improving film quality, enabling miniaturization without the penalty of high dielectric loss.
3Speed
If the capacitor operates at high frequency, then the circuit performance is improved, but the capacitance value deviates due to natural frequency effects
Solution Approach 1:
Dividing the dielectric into multiple thin layers increases the natural frequency of the capacitor stack by reducing the mass and increasing stiffness. This allows the capacitor to operate stably at higher frequencies without capacitance deviation, resolving the contradiction between operating frequency and capacitance stability.
Solution Approach 2:
The composite dielectric structure with inorganic and organic layers provides optimized mechanical and electrical properties that raise the natural frequency. The inorganic layer provides high permittivity for compact design while the organic layer improves flatness and reduces losses, enabling stable high-frequency operation.
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 design stabilizes capacitance values and reduces dielectric loss, enabling miniaturization and improved performance at high frequencies by controlling the natural frequency and dielectric loss.
Implementation Method 1
The first capacitor dielectric layer includes a first dielectric layer and a second dielectric layer, the first dielectric layer includes an inorganic dielectric layer, and the second dielectric layer includes an organic dielectric layer
Data Source
AI summary
A capacitor including a first electrode, a second electrode, and a first capacitor dielectric layer is provided. The first capacitor dielectric layer is disposed between the first electrode and the second electrode. The first capacitor dielectric layer includes a first dielectric layer and a second dielectric layer, the first dielectric layer includes an inorganic dielectric layer, and the second dielectric layer includes an organic dielectric layer, wherein the first dielectric layer is located between the first electrode and the second dielectric layer, and the second dielectric layer is located between the first dielectric layer and the second electrode.