Feedthrough Capacitor Asymmetric Grounding ESL Reduction
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Solution Overview
Problem
Existing feedthrough capacitors face challenges in reducing equivalent series inductance (ESL) and maintaining wiring density when mounted on circuit boards, leading to potential reductions in high-frequency operation and circuit board space utilization.
Innovation Solution
A feedthrough capacitor design with signal and ground terminal electrodes arranged on end and side faces, respectively, where the ground terminal electrodes are positioned closer to the end faces, reducing ESL and maximizing wiring space by avoiding terminal electrode overlap, allowing for parallel capacitance components and lower profile formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal electrodes are arranged on all faces of the capacitor element body, then ESL is reduced, but wiring space on the circuit board is reduced
Solution Approach 1:
The terminal electrodes are segmented into signal terminal electrodes and ground terminal electrodes, with each type positioned on specific faces. The ground terminal electrodes are positioned on side faces nearer to end faces, while signal terminal electrodes are on end faces, creating distinct functional zones that reduce ESL without compromising wiring space.
Solution Approach 2:
Different faces of the capacitor element body are assigned different electrode types based on their local functional requirements. End faces receive signal terminal electrodes for signal input/output, while side faces nearer to end faces receive ground terminal electrodes for grounding, optimizing both ESL and wiring space utilization.
2Reliability
If ground terminal electrodes are positioned nearer to end faces, then ESL is reduced, but the central wiring space is maintained
Solution Approach 1:
The electrode arrangement exhibits asymmetric positioning where ground terminal electrodes are specifically located on side faces nearer to end faces, rather than being uniformly distributed. This asymmetric arrangement optimizes ESL by placing ground electrodes closer to signal electrodes while maintaining central wiring space.
Data Source
AI summary
A feedthrough capacitor has: a capacitor element body of a substantially rectangular parallelepiped shape in which a plurality of insulator layers are laminated together; a signal internal electrode arranged in the capacitor element body; a ground internal electrode arranged in the capacitor element body and opposed to the signal internal electrode; signal terminal electrodes connected to the signal internal electrode; and a ground terminal electrode connected to the ground internal electrode. The signal terminal electrodes are provided on first and second end faces, respectively, in a longitudinal direction of the capacitor element body. The ground terminal electrode is provided on at least one side face out of first to fourth side faces extending along the longitudinal direction of the capacitor element body. Furthermore, the ground terminal electrode is located nearer at least one end face out of the first end face and the second end face.