Multilayer Filter Resonator Layout for Misalignment Tolerance

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Solution Overview

Problem

Manufacturing variations in band-pass filters using stacked dielectric and conductor layers lead to misalignment of resonator conductor portions, causing significant changes in filter characteristics.

Innovation Solution

A multilayered filter device design with resonator conductor layers extending in opposite directions and through holes orthogonal to the stacking direction, which are connected to a ground conductor layer, to stabilize resonator lengths and suppress characteristic changes due to manufacturing variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If resonator conductor portions are arranged in opposite directions from through holes, then manufacturing variation tolerance is improved, but device complexity increases

Engineering Contradiction:

Improvetolerance to conductor layer misalignmentVSAvoidresonator configuration complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The resonator conductor portions are configured to extend in opposite directions from the through holes, creating an asymmetric arrangement where misalignment in one direction compensates for misalignment in the other direction, thereby suppressing characteristic changes due to manufacturing variations

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The invention utilizes the spatial arrangement in opposite directions (dimensional configuration) to compensate for manufacturing variations, transforming a one-dimensional alignment problem into a two-dimensional compensatory structure

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If miniaturization is pursued for band-pass filters, then device size is reduced, but manufacturing alignment precision becomes more difficult to maintain

Engineering Contradiction:

Improvefilter device sizeVSAvoidconductor layer alignment

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

By configuring resonator conductor portions to extend in opposite directions, the design creates a symmetric compensation mechanism that is scale-invariant, meaning the compensatory effect remains effective regardless of the overall device size, thus enabling miniaturization without sacrificing alignment tolerance

Inventive Principle:

Principle #4Asymmetry

3Reliability

If resonator conductor portions are made longer to improve frequency characteristics, then filter performance is improved, but sensitivity to manufacturing variations increases

Engineering Contradiction:

Improvefilter characteristic stabilityVSAvoidalignment tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The opposite-direction configuration creates a differential structure where length variations in one resonator conductor portion are compensated by corresponding variations in the other, allowing longer resonator lengths for improved performance while maintaining tolerance to manufacturing variations

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS12500323B2Multilayered filter device

Publication Date: 2025.12.16 TDK CORP

AI summary

A filter device includes a ground conductor layer, at least one through hole electrically connected to the ground conductor layer, a first resonator conductor layer and a second resonator conductor layer arranged to sandwich the at least one through hole, and a stack. The first resonator conductor layer extends in a first direction becoming away from the at least one through hole, i.e., the −X direction. The second resonator conductor layer extends in a second direction becoming away from the at least one through hole, i.e., the X direction.