Multilayer LC Filter Electrode Layout for Misalignment-Stable Inductance
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Solution Overview
Problem
Lamination misalignment in multilayer filter devices can cause changes in inductance values, affecting filter characteristics such as pass band width and center frequency.
Innovation Solution
The filter device is configured with plate electrodes that have distinct shapes, where the extending portions in the long side direction have smaller areas than those in the short side direction, reducing the impact of lamination misalignment on inductor coil diameter and filter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plate electrodes with the same shape are used in multilayer construction, then the inductance value changes significantly when lamination misalignment occurs, but using different shapes increases manufacturing complexity
Solution Approach 1:
The patent applies asymmetry by designing the first plate electrode and second plate electrode with different shapes. Specifically, the first plate electrode has a first extending portion with a first area, while the second plate electrode has a second extending portion with a second area that is different from the first area. This asymmetric design ensures that when lamination misalignment occurs, the change in overlapping area is minimized, thereby maintaining consistent inductance values despite manufacturing variations.
Solution Approach 2:
The patent applies local quality by making different parts of the electrode structure have different properties. The first plate electrode and second plate electrode are designed with different extending portion areas at specific locations. This local differentiation in electrode geometry allows the structure to compensate for misalignment at critical overlapping regions while maintaining overall functionality, thus improving inductance consistency without requiring complete redesign of the entire electrode system.
2Reliability
If lamination misalignment occurs during manufacturing, then the inside diameter of the coil changes and filter characteristics deviate, but increasing tolerance for misalignment reduces manufacturing precision
Solution Approach 1:
The patent applies beforehand cushioning by pre-designing the electrode structure to tolerate and compensate for expected misalignment. The asymmetric electrode shapes are configured in advance such that the overlapping areas between first and second plate electrodes are optimized to minimize the impact of potential misalignment. This proactive design creates a buffer against manufacturing variations, ensuring that even when lamination misalignment occurs within expected tolerance ranges, the coil inside diameter and filter characteristics remain stable.
3Loss of energy
If the overlapping area of plate electrodes is large, then the resistance value decreases and Q factor improves, but the sensitivity to lamination misalignment increases
Solution Approach 1:
The patent applies parameter changes by optimizing the areas of the extending portions of the plate electrodes. The first plate electrode has a first extending portion with a first area, and the second plate electrode has a second extending portion with a second area that is different from the first area. This parameter differentiation allows the structure to maintain sufficient overlapping area for low resistance while being less sensitive to misalignment, as the asymmetric configuration distributes the overlapping area more favorably across potential misalignment scenarios.
Data Source
AI summary
A filter device includes a multilayer body including dielectric layers, and an LC resonator including an inductor and a capacitor to transmit a signal from an input terminal to an output terminal. The LC resonator includes plate electrodes on dielectric layers different from each other and connected by a via. The plate electrodes define and function as the inductor. The plate electrodes overlap at least partially in a direction of lamination of the multilayer body. Each of the plate electrodes includes an extending portion extending in an x axis direction, and an extending portion extending in a y axis direction. An area of the extending portion of one plate electrode is smaller than an area of the other extending portion.