Feed-through Capacitor Impedance Design for High-Frequency Noise
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Solution Overview
Problem
Conventional feed-through capacitors can secure a tolerable level of DC but fail to effectively inhibit high-frequency noise components from flowing into conduction units, leading to incomplete noise removal.
Innovation Solution
A feed-through capacitor design featuring a capacitor body with stacked dielectric layers and inner electrodes, including signal and grounding terminal electrodes, a capacitor unit on the mount surface, and a conduction unit with a conduction inner electrode that connects signal terminal electrodes, where the distance between the capacitor unit's inner electrode and the conduction unit's inner electrode is greater, enhancing impedance and directing high-frequency noise to grounding electrodes, thereby preventing noise from reaching the conduction unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple through-hole electrodes are arranged to reduce total resistance, then DC level is secured, but high-frequency noise components flow toward conduction units
Solution Approach 1:
The through-hole electrodes are segmented into capacitor units and conduction units with distinct functions. Capacitor units handle high-frequency noise while conduction units maintain DC levels, preventing noise from flowing into conduction units through strategic placement and functional separation.
Solution Approach 2:
Different regions of the capacitor body are assigned different properties: capacitor units near the mounting substrate have characteristics optimized for noise filtering, while conduction units have characteristics optimized for DC conduction. This local differentiation allows each unit to perform its specific function effectively.
2Object-affected harmful factors
If capacitor unit is placed on mount surface to remove high-frequency noise, then noise removal is improved, but impedance between capacitor unit and conduction unit must be enhanced
Solution Approach 1:
A dielectric layer is introduced as an intermediary between the capacitor unit and conduction unit. This dielectric layer provides the necessary impedance to prevent high-frequency noise from coupling into the conduction unit while allowing the capacitor unit to effectively filter noise from the signal.
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 design effectively secures a tolerable level of DC while inhibiting high-frequency noise components from entering the conduction unit, improving noise removal and reducing resistance values, thus enhancing the overall performance of the feed-through capacitor.
Implementation Method 1
the distance between the inner electrode of the capacitor unit located closest to the conduction unit and the conduction inner electrode of the conduction unit is greater than that between the inner electrodes in the capacitor unit. This enhances the impedance between the capacitor unit and the conduction unit, thereby making it possible to feed the high-frequency noise components from the signal inner electrode of the capacitor unit to its grounding inner electrode
Implementation Method 2
enhances the impedance between the capacitor unit and the conduction unit, thereby making it possible to feed the high-frequency noise components from the signal inner electrode of the capacitor unit to its grounding inner electrode, so as to make them flow reliably to the grounding terminal electrodes
Data Source
AI summary
In a feed-through capacitor, a conduction unit having a plurality of conduction inner electrodes can fully secure a tolerable level of DC. A capacitor unit is formed on the mount surface side in a capacitor body, so that high-frequency noise components can be removed by the capacitor unit before reaching the conduction unit. The distance between the grounding inner electrode located closest to the conduction unit and the conduction inner electrode in the conduction unit is greater than that between the signal inner electrode and grounding inner electrode in the capacitor unit. This enhances the impedance between the capacitor unit and the conduction unit, so as to inhibit the high-frequency noise components from flowing into the conduction unit.