Diamond-Layer RF Substrate for Harmonic Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing substrates for high-frequency devices, such as those using silicon-based SOI structures, face limitations in further improving high-frequency characteristics, particularly in reducing harmonic interference.
Innovation Solution
A substrate for high-frequency devices is developed, featuring a support substrate with surface unevenness, a diamond layer for enhanced thermal conductivity and high-speed sound properties, and a silicon oxide film layer for improved insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a silicon-based SOI structure is used for high-frequency devices, then compatibility with CMOS process and mass production capability are improved, but harmonic interference and cross-talk cannot be sufficiently reduced
Solution Approach 1:
The patent employs a composite structure consisting of a silicon substrate, a diamond layer, and a silicon oxide film layer. The diamond layer (50-500 nm thick) serves as an intermediate layer between the silicon substrate and the upper device layers, combining the advantages of silicon (CMOS compatibility) with diamond's superior thermal conductivity and acoustic properties for reducing harmonic interference.
Solution Approach 2:
The diamond layer acts as an intermediary layer between the silicon substrate and the device structure. This intermediate diamond layer mediates the interaction between the silicon substrate and the device, providing thermal management and reducing harmonic interference while maintaining CMOS process compatibility.
2Object-affected harmful factors
If the resistivity of the support substrate is increased to reduce harmonic interference, then 2HD characteristics are improved, but thermal dissipation capability may be compromised
Solution Approach 1:
The patent uses a composite structure where the diamond layer provides high thermal conductivity for effective heat dissipation, while the high-resistivity silicon substrate (≥500 Ω·cm) provides electrical isolation and reduced harmonic interference. This composite approach resolves the contradiction between thermal management and harmonic reduction.
Solution Approach 2:
The patent changes the material parameter (thermal conductivity) by introducing diamond, which has exceptionally high thermal conductivity, while maintaining the electrical parameter (resistivity) at high levels through the silicon substrate selection. This parameter optimization simultaneously addresses both thermal dissipation and harmonic interference.
3Object-affected harmful factors
If a diamond layer is introduced to improve thermal conductivity and reduce harmonic interference, then high-frequency characteristics are improved, but device complexity increases
Solution Approach 1:
The patent optimizes the diamond layer thickness to 50-500 nm, which is sufficient to provide the desired thermal and acoustic benefits while minimizing the increase in device complexity. This parameter optimization ensures that the performance improvement is achieved with minimal added structural complexity.
Solution Approach 2:
The diamond layer serves as a thin intermediary film that provides multiple functions (thermal management, harmonic interference reduction) without significantly increasing device complexity. The thin film approach allows the benefits to be achieved with minimal impact on device architecture.
4Object-affected harmful factors
If a silicon oxide film layer is added on the diamond layer to enhance insulating properties, then electrical isolation is improved, but manufacturing steps increase
Solution Approach 1:
The silicon oxide film layer serves multiple functions: it provides electrical isolation, protects the diamond layer, and can serve as a base for subsequent device fabrication steps. This multi-functionality justifies the additional manufacturing step by providing multiple benefits from a single layer.
Solution Approach 2:
The patent creates a composite structure with silicon oxide film on diamond, where each material contributes its superior properties. The silicon oxide provides excellent electrical isolation and chemical stability, while the diamond provides thermal management and harmonic interference reduction, creating a multi-functional composite substrate.
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 proposed substrate significantly improves high-frequency characteristics by reducing harmonic interference and enhancing heat dissipation, while maintaining high insulating properties.
Implementation Method 1
improvement of heat-dissipating property using excellent thermal conductivity of diamond
Implementation Method 2
enhanced insulating property by providing the silicon oxide film layer on the diamond layer
Data Source
AI summary
A substrate for a high-frequency device including a support substrate having unevenness on a surface thereof, a diamond layer on the surface of the support substrate, and a silicon oxide film layer on the diamond layer. Thereby, the substrate for a high-frequency device using diamond having excellent high-frequency characteristics and a method for producing a substrate for a high-frequency device using diamond having excellent high-frequency characteristics are provided.