Microwave Dielectric Metallization for Uniform Low-Roughness Copper
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Solution Overview
Problem
Existing methods for metallizing microwave dielectric components, such as pressing, vacuum sputtering, and screen printing, result in uneven metal layer thickness, poor binding force, and high surface roughness, leading to signal interference, nonlinearity, and reliability issues, particularly in non-plate-shaped components.
Innovation Solution
A method involving ion implantation and arc plasma deposition is used to form a conductive seed layer, followed by electroplating, to achieve uniform metal layers with high peel strength and low surface roughness, suitable for both surface and hole metallization of irregularly shaped components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional metallization methods (pressing, vacuum sputtering, screen printing) are used, then the metal layer can be formed on the microwave dielectric component surface, but the metal layer exhibits uneven thickness, high surface roughness, and poor binding force, leading to signal interference and reliability issues
Solution Approach 1:
The patent applies ion implantation and arc plasma deposition as preliminary treatments before electroplating. These preliminary actions create a conductive seed layer with excellent adhesion to the dielectric substrate, ensuring that subsequent electroplating produces a uniform metal layer with high binding force. The preliminary ion implantation modifies the substrate surface properties, enabling better metal layer attachment and preventing the peeling issues observed in conventional methods.
Solution Approach 2:
The patent replaces conventional mechanical metallization methods (pressing, screen printing) with physical field-based methods (ion implantation, arc plasma deposition, electroplating). This substitution eliminates the mechanical contact and pressure variations that cause uneven thickness and poor adhesion, resulting in a more uniform and reliably bonded metal layer throughout the component.
2Ease of manufacture
If high roughness copper foil is used in pressing method, then the bonding process is simplified, but the skin effect increases and electric field nonlinearity is generated, affecting microwave signal transmission
Solution Approach 1:
The patent fundamentally changes the surface roughness parameter of the metal layer by using ion implantation and arc plasma deposition followed by electroplating. This produces a metal layer with surface roughness RZ < 0.1 μm, compared to the high roughness of conventional copper foil. The parameter change eliminates skin effect and electric field nonlinearity while maintaining manufacturing feasibility through the controlled deposition process.
Solution Approach 2:
The patent replaces the mechanical pressing and bonding of rough copper foil with a field-based electroplating process. This substitution allows for precise control of metal layer formation without mechanical contact, achieving smooth surfaces that eliminate harmful skin effects while maintaining ease of manufacture through automated electroplating processes.
3Adaptability or versatility
If conventional pressing method is used for plate-shaped components, then the metal layer can be formed, but the method cannot metallize non-plate-shaped microwave dielectric components
Solution Approach 1:
The patent employs ion implantation and arc plasma deposition as universal preliminary treatments that can be applied to any microwave dielectric component shape. These methods do not require the component to be plate-shaped and can metallize complex three-dimensional structures. The subsequent electroplating process also adapts to various geometries, providing universal applicability while maintaining uniform metal layer thickness across different component shapes.
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 method ensures uniform metal layer thickness, high conductivity, and improved reliability by reducing surface roughness and eliminating defects like pinholes and burrs, thereby enhancing microwave signal transmission and reducing Passive Inter-Modulation products.
Implementation Method 1
performing ion implantation and plasma deposition simultaneously on a surface of the perforated microwave dielectric substrate and a hole wall of the hole to form a perforated microwave dielectric substrate having a conductive seed layer
Implementation Method 2
performing ion implantation and plasma deposition simultaneously on a surface of the perforated microwave dielectric substrate and a hole wall of the hole to form a perforated microwave dielectric substrate having a conductive seed layer
Implementation Method 3
thickening the perforated microwave dielectric substrate having the conductive seed layer by electroplating copper to form a microwave dielectric copper clad laminate with a metallized hole
Data Source
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AI summary
A microwave dielectric component (100) comprises a microwave dielectric substrate (101) and a metal layer, the metal layer being bonded to a surface of the microwave dielectric substrate (101). The metal layer comprises a conductive seed layer and a metal thickening layer (105). The conductive seed layer comprises an ion implantation layer (103) implanted into the surface of the microwave dielectric substrate (101) and a plasma deposition layer (104) adhered on the ion implantation layer (103). The metal thickening layer (105) is adhered on the plasma deposition layer (104). A manufacturing method of the microwave dielectric component (100) is further disclosed.