Conductive Casing Structure With Capacitive Contact for Radiated Noise
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Solution Overview
Problem
Existing electronic devices suffer from significant unwanted radiated noise due to high-frequency noise current and voltage propagating through electrical contacts, forming a resonant system that generates noise, which existing configurations like spring members fail to adequately address.
Innovation Solution
A structure with a first and second plate portion having electrical continuity, connected by first and second electrical connection members with specific electrostatic capacitance between 1.4 pF and 100 pF, and optionally a dielectric member, to establish electrical continuity and prevent resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical contacts are used to connect components, then electrical continuity is achieved, but high-frequency noise current and voltage propagate through the contacts forming a resonant system that generates significant unwanted radiated noise
Solution Approach 1:
The patent introduces an elastic member as an intermediary element between conductive members to establish electrical continuity. The elastic member with specific electrostatic capacitance (1.4 pF to 100 pF) acts as a mediator that allows electrical connection while preventing high-frequency noise propagation by disrupting the resonant system formation.
Solution Approach 2:
The patent changes the electrical parameters of the connection system by specifying the electrostatic capacitance of the elastic member within a particular range (1.4 pF to 100 pF). This parameter change transforms the connection from a noise-prone direct contact to a capacitive coupling that blocks high-frequency noise while maintaining electrical continuity for signal transmission.
2Reliability
If spring members are used to electrically connect components, then electrical continuity is provided, but the inductance of the elastic members increases which can affect high-frequency performance
Solution Approach 1:
The patent addresses the inductance issue by changing the electrical parameters through capacitive coupling. By specifying the electrostatic capacitance range (1.4 pF to 100 pF) of the elastic member, the system transforms the connection characteristics to favor capacitance over inductance at high frequencies, effectively counteracting the increased inductance of the elastic members.
3Reliability
If direct electrical contacts are used between plate portions, then electrical continuity is achieved, but resonance occurs in specific frequency bands generating unwanted noise
Solution Approach 1:
The elastic member serves as an intermediary that replaces direct electrical contacts between plate portions. This intermediary element with controlled electrostatic capacitance (1.4 pF to 100 pF) maintains electrical continuity while preventing the formation of resonant systems that cause noise in specific frequency bands.
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 structure effectively reduces high-frequency noise leakage and resonance, enhancing electrical continuity and stability by incorporating a capacitive connection to counteract increased inductance in elastic members.
Implementation Method 1
an electrostatic capacitance between the second electrical connection member and the second plate portion is between 1.4 picofarad (pF) and 100 pF, inclusively
Data Source
AI summary
A structure including a first plate portion having conductivity and a second plate portion having electrical continuity, the structure includes a first electrical connection member and a second electrical connection member extending from the first plate portion and each having an end portion that is an open end, wherein, in a state where the first plate portion and the second plate portion are joined, the first electrical connection member is arranged in contact with the second plate portion, and the second electrical connection member is arranged out of contact with the second plate portion, and wherein an electrostatic capacitance between the second electrical connection member and the second plate portion is between 1.4 picofarad (pF) and 100 pF, inclusively.