Filter Device Terminals Grounded via Inductors for Plating
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Solution Overview
Problem
In filter devices where input and output terminals are capacitively coupled to a resonant circuit, they often remain in an electrically floating state without grounding, leading to insufficient coverage with metals like Au or Sn for corrosion resistance.
Innovation Solution
The input and output terminals are connected to a grounding terminal via inductors, ensuring they are not in an electrically insulated state, allowing for effective coverage with metals having high corrosion resistance during electrolytic plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If input and output terminals are capacitively coupled to the resonant circuit without grounding connection, then the filter device achieves simplified structure and electrical insulation, but the terminals remain in electrically floating state leading to insufficient coverage with corrosion-resistant metals
Solution Approach 1:
The patent introduces inductors as intermediary components between the input/output terminals and the resonant circuit. These inductors serve as mediators that allow the terminals to be electrically connected to ground through them, enabling current flow during electrolytic plating while maintaining the capacitive coupling function. This resolves the contradiction by providing a path for plating current without directly grounding the terminals, thus achieving both corrosion resistance and functional simplicity.
2Reliability
If input and output terminals are connected to grounding terminal via inductors, then adequate coverage with corrosion-resistant metals is achieved, but the device structure becomes more complex
Solution Approach 1:
The inductors in the patent serve multiple functions: they provide the necessary electrical path for electrolytic plating current to reach the terminals, maintain the capacitive coupling characteristics of the filter, and enable proper grounding connection. By making the inductors multi-functional, the patent avoids adding unnecessary complexity while achieving the corrosion resistance goal.
3Ease of manufacture
If terminals are left in electrically floating state, then manufacturing process is simplified, but electrolytic plating cannot effectively cover the terminals due to no current flow
Solution Approach 1:
The patent implements preliminary grounding connection through inductors before the electrolytic plating process. This preliminary action ensures that when plating is performed, the terminals are already connected to ground through the inductors, allowing plating current to flow effectively and achieve adequate metal coverage. This prevents the need to redesign the terminal structure specifically for plating.
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 configuration allows for adequate coverage of input and output terminals with high corrosion-resistant metals, preventing soldering erosion and maintaining the integrity of the filter device's bandpass characteristics.
Implementation Method 1
The first inductor is structured to connect the input terminal and the grounding terminal. The second inductor is structured to connect the output terminal and the grounding terminal.
Implementation Method 2
a resonant circuit including at least one resonator
Implementation Method 3
A metal with high corrosion resistance such as Au or Sn is generally formed by electrolytic plating after a filter device has been formed.
Data Source
AI summary
A filter device includes an input terminal, an output terminal, a shield conductor, and a resonant circuit including at least one resonator, and inductors. A first inductor connects the input terminal and the shield conductor. A second inductor connects the output terminal and the shield conductor. The input terminal and the output terminal are capacitively coupled to the resonant circuit.