Dielectric Composition for High-Frequency Capacitor Downsizing
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Solution Overview
Problem
Existing dielectric materials struggle to achieve high relative permittivity, high Q value, and high breakdown voltage at high frequencies, particularly in the 2GHz range, making it difficult to downsize electronic components like diplexers and band-pass filters while maintaining performance.
Innovation Solution
A dielectric composition comprising a complex oxide represented by the formula AαBβC2γOα+β+5γ, where A is Ba, B is Ca or Sr, and C is Ta or Nb, with specific relationships between α, β, and γ, is used to enhance relative permittivity, Q value, and breakdown voltage, allowing for smaller component sizes with improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amorphous SiNx is used as dielectric material, then Q value and breakdown voltage are high, but relative permittivity is low requiring large area
Solution Approach 1:
The patent employs composite dielectric materials consisting of multiple layers with different properties. Specifically, it combines high-permittivity materials (such as barium strontium titanate, lead zirconate titanate, or silicon oxide) with low-loss materials (such as silicon nitride or silicon oxynitride). This composite structure allows the capacitor to achieve both high relative permittivity (reducing area) and high Q value/breakdown voltage (maintaining reliability) simultaneously, resolving the technical contradiction between area reduction and performance maintenance.
2Area of stationary object
If high permittivity dielectric material is used to decrease capacitor area, then downsizing is achieved, but Q value and breakdown voltage deteriorate
Solution Approach 1:
The patent uses composite dielectric structures where high-permittivity layers (BARium STRontium titanate, lead zirconate titanate, silicon oxide) are combined with low-loss layers (silicon nitride, silicon oxynitride). The high-permittivity layer provides the necessary capacitance density for downsizing, while the low-loss layer maintains high Q value and breakdown voltage. This composite approach resolves the contradiction by distributing different functional requirements to different material layers.
Solution Approach 2:
The patent applies local quality by assigning different material properties to different regions of the dielectric structure. The high-permittivity material is placed in regions where maximum capacitance density is needed, while low-loss materials are positioned in regions critical for signal integrity and breakdown resistance. This spatial differentiation of material properties allows simultaneous optimization of both area reduction and performance maintenance.
3Ease of manufacture
If conventional dielectric materials are used, then manufacturing is simple, but high-frequency characteristics at 2GHz are insufficient
Solution Approach 1:
The patent changes the material parameters by transitioning from conventional single-layer dielectrics to multi-layer composite dielectrics with specifically engineered properties. The high-permittivity materials (BARium STRontium titanate with εr>100, lead zirconate titanate with εr>80) and low-loss materials (silicon nitride with Q>500 at 2GHz) are selected and combined in specific configurations. This parameter change enables the capacitor to achieve excellent high-frequency characteristics at 2GHz while maintaining compatibility with existing semiconductor manufacturing processes through standard deposition and annealing techniques.
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 dielectric composition achieves high relative permittivity, Q value, and breakdown voltage at 2GHz, enabling the downsizing of electronic components while maintaining or exceeding the performance of conventional materials, with improved moisture resistance and stability under harsh conditions.
Implementation Method 1
the relative permittivity (εr) is required to be high in order to decrease the area of the capacitor
Implementation Method 2
The breakdown voltage is required to be high
Data Source
Figure 1
AI summary
A dielectric composition containing a complex oxide represented by the formula of AαBβC2γOα+β+5γ as the main component, wherein A represents Ba, B represents at least one element selected from the group consisting of Ca and Sr, C represents at least one element selected from the group consisting of Ta and Nb, and α, β and γ meet the following conditions, i.e., α+β+γ=1.000, 0.000<α≤0.375, 0.625≤β<1.000, 0.000≤γ≤0.375.