Vacuum Deposition Conductive Patterns for RFID Antennas
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Solution Overview
Problem
Conventional methods for producing RFID antennas and transparent conductive electrodes are expensive, environmentally unsafe, and unsuitable for fine patterns due to the thickness requirements and low electrical conductivity of standard materials.
Innovation Solution
A method involving vacuum deposition of a thin conductive layer, selective application of insulating material, electroplating, and chemical etching to achieve the desired thickness and pattern on a substrate, allowing for flexible and efficient production of conductive objects like RFID antennas and TCEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chemical etching of copper or aluminum foils is used to produce RFID antennas, then the required thickness of 11-15 microns can be achieved, but the production becomes very expensive and slow
Solution Approach 1:
The patent changes the thickness parameter of the conductive layer from conventional 11-15 microns down to 3-10 microns through vacuum deposition, enabling faster production while maintaining electrical functionality. This parameter change resolves the contradiction by achieving sufficient conductivity at reduced thickness, thereby increasing production speed without sacrificing the required electrical performance.
Solution Approach 2:
The patent replaces the mechanical chemical etching process with a vacuum deposition process. Instead of removing material through chemical reactions (etching), the invention deposits conductive material in a vacuum environment, which is inherently faster and more controllable. This substitution of the manufacturing mechanism directly addresses the productivity issue while maintaining manufacturing precision.
2Reliability
If standard copper film with thickness of 18-35 microns is used for RFID antennas, then sufficient electrical conductivity is achieved, but the production cost increases significantly
Solution Approach 1:
The patent reduces the conductive layer thickness parameter from 18-35 microns to 3-10 microns through vacuum deposition. This parameter change maintains sufficient electrical conductivity for RFID antenna functionality while significantly reducing material consumption and production costs. The vacuum deposition process ensures uniform thickness and good adhesion, preserving reliability at reduced cost.
Solution Approach 2:
The patent uses a thin vacuum-deposited conductive layer instead of thick conventional copper foil. This thinner layer uses less expensive material and reduces waste, aligning with the principle of using cheaper, more efficient materials that accomplish the same function with less resource consumption.
3Manufacturing precision
If chemical etching process is used to produce conductive patterns, then the required thickness can be achieved, but environmental safety is compromised
Solution Approach 1:
The patent replaces the chemical etching process with vacuum deposition. Chemical etching uses harsh chemicals that require special handling, disposal, and environmental controls. Vacuum deposition is a physical process that occurs in a controlled vacuum environment, eliminating the need for harmful chemicals and their associated environmental risks. This substitution maintains manufacturing precision while dramatically improving environmental safety.
Solution Approach 2:
The patent converts the potential harm of chemical etching into benefit by using vacuum deposition. The vacuum environment, which could be seen as a limitation, is actually utilized as an advantage to deposit clean, uniform conductive layers without chemical contamination. This transforms what could be a harmful process into a clean, environmentally friendly manufacturing method.
4Reliability
If conductive ink based on silver paste is used for printing patterns, then conductive objects can be produced, but the process becomes expensive and unsuitable for fine patterns
Solution Approach 1:
The patent replaces the inkjet or screen printing process with vacuum deposition. Printing methods rely on liquid or paste materials that have inherent limitations in achieving fine, precise patterns due to viscosity, drying time, and material spread. Vacuum deposition deposits material as a fine vapor that condenses into precise patterns on the substrate, enabling much finer feature sizes and better pattern definition while maintaining electrical conductivity.
Solution Approach 2:
The patent changes the physical state parameter of the conductive material from liquid/paste (ink) to vapor (vacuum deposition). This parameter change enables finer pattern resolution because vapor can be deposited more precisely and uniformly than liquid or paste materials. The vapor-phase deposition allows for better control of pattern geometry and finer feature sizes.
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
This method reduces production costs, enhances environmental safety, and enables the creation of fine patterns with improved electrical conductivity, making it suitable for various applications such as RFID labels and flexible electronics.
Implementation Method 1
depositing onto a substrate, in a vacuum chamber, an electrically conductive layer
Implementation Method 2
immersing the coated substrate in an electrolyte solution for electroplating the electrically conductive layer
Implementation Method 3
electroplating the electrically conductive layer to form a layer having a desired thickness
Implementation Method 4
chemically etching a thin layer of the electrically conductive layer from the entire surface
Data Source
AI summary
According to embodiments of the present invention, a method for manufacturing a pattern of conductive elements on a substrate is provided. The method includes depositing in a vacuum deposition chamber an electrically conductive material onto the substrate to form a base layer. Then, the method includes selectively applying an electric insulating agent on selective areas of the base layer. Then, areas of the base layer that are not covered with the insulating material are electroplated with a second electrically conductive layer. The electric insulating agent is then removed from the substrate and the base layer is chemically etched thus removing the base layer that was covered with the insulating material and selectively exposing the substrate to create the pattern of conductive objects on the substrate.