Multilayer Coil Layout to Cut Eddy Current Q-Value Loss
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Solution Overview
Problem
In multilayer coil components, the connection reliability between the coil and terminal electrodes is compromised due to the use of through hole conductors, leading to a decrease in Q-value due to eddy current losses.
Innovation Solution
The coil component features a configuration where terminal electrodes are arranged on the inner side of the element body, with recessed parts to reduce volume and minimize eddy current losses, allowing direct connection to the coil without through hole conductors, ensuring reliable connections and reduced eddy current-induced Q-value decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through hole conductor is used to connect the coil and terminal electrode, then connection reliability is improved, but Q-value decreases due to eddy current losses
Solution Approach 1:
The invention extracts and removes the through hole conductor from the structure, replacing it with a direct connection between the coil and terminal electrode formed within the same dielectric layer. This eliminates the harmful eddy current path while maintaining electrical connection functionality.
Solution Approach 2:
The invention merges the coil and terminal electrode into the same dielectric layer, creating a direct connection structure. This integration eliminates the need for separate through hole conductors and reduces eddy current losses by removing the intermediate conductive path.
2Reliability
If the terminal electrode is arranged close to the coil to enable direct connection, then connection reliability is improved, but Q-value decreases due to magnetic flux passing through the terminal electrode
Solution Approach 1:
The invention applies local quality by providing a recessed part in the terminal electrode at the position where magnetic flux density is high. This localized modification reduces the electrode volume in the critical area, minimizing eddy current losses while maintaining connection reliability elsewhere.
Solution Approach 2:
The terminal electrode is segmented into different regions: a full-volume region for reliable electrical connection and a recessed region where magnetic flux passes through. This segmentation allows the electrode to simultaneously achieve both connection reliability and reduced eddy current loss.
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 enhances connection reliability and minimizes Q-value decreases by reducing eddy current losses, thereby improving the performance of multilayer coil components.
Implementation Method 1
a magnetic flux of the coil passes through the terminal electrode, and there is a possibility that a Q-value is decreased due to a loss by an eddy current
Implementation Method 2
a Q-value is decreased due to a loss by an eddy current
Data Source
AI summary
In a multilayer coil component 1, a coil 7 includes a first connection part 22a and a second connection part 26a, the first connection part 22a is connected to one end part of the coil 7, which part is placed on a side of one principal surface 2c, and is arranged in an identical dielectric layer 6 with a conductor 22 included in the one end part, the second connection part 26a is connected to the other end part of the coil 7, which part is placed on a side of the other principal surface 2d, and is arranged in an identical dielectric layer 6 with a conductor 26 included in the other end part, and recessed parts 8a and 8b and recessed parts 9a and 9b are respectively provided in the first terminal electrode 4 and the second terminal electrode 5 in the element body 2.