Dielectric Filter Electrode Layout for Stable Capacity Gaps

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Dielectric filters using dielectric resonators face issues with unstable characteristics and potential upsizing due to non-linear distortion in the lamination direction, particularly when the capacitor portion is disposed in the outer peripheral distortion region.

Innovation Solution

The dielectric filter is configured with resonator and capacitor portions arranged such that the resonator portions are in a stable region and the capacitor portions are in a distortion region, with the capacitive electrode elements extending in a direction intersecting the lamination direction, maintaining a stable capacity gap despite material shrinkage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the capacitor portion is disposed in the outer peripheral distortion region, then the filter size is reduced, but the gap size becomes unstable and characteristics vary

Engineering Contradiction:

Improvefilter sizeVSAvoidgap size stability

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent applies different orientation configurations to different electrode elements based on their position. Capacitive electrode elements in the distortion region are oriented to intersect with the lamination direction, while those in stable regions maintain conventional orientation. This localized differentiation allows the filter to achieve compact size by utilizing the distortion region while maintaining gap stability through appropriate orientation of electrode elements in that region.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the capacitor portion is disposed in the stable region, then the gap size is stable, but the filter size increases

Engineering Contradiction:

Improvegap size stabilityVSAvoidfilter size

Core Design Contradiction:

Manufacturing precisionVSVolume of moving object

Solution Approach 1:

The patent changes the orientation parameter of capacitive electrode elements disposed in the distortion region, making them extend in a direction intersecting with the lamination direction rather than parallel to it. This parameter change allows the electrode elements to maintain stable effective gap dimensions despite the non-linear distortion of the laminated body, thereby achieving compact filter size without sacrificing gap stability.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If stress-restraining measures are applied to prevent distortion, then manufacturing complexity increases, but the gap stability is maintained

Engineering Contradiction:

Improvegap stabilityVSAvoidmanufacturing process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Instead of trying to prevent or restrain the non-linear distortion through complex stress-restraining measures, the patent accepts the distortion as an inherent characteristic and converts it into a benefit by strategically orienting capacitive electrode elements to intersect with the lamination direction. This approach uses the distortion region effectively to reduce filter size while maintaining gap stability, eliminating the need for additional manufacturing complexity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 stabilizes the filter characteristics while preventing upsizing, reducing the need for additional stress-restraining measures and minimizing manufacturing defects.

Implementation Method 1

a region (hereinafter also referred to as a "distortion region") in which non-linear distortion in a lamination direction easily occurs due to shrinkage of the material

Methodology Applied

Scientific EffectShrinkage: Thermal Contraction

Implementation Method 2

forms a capacity between the capacitor portion and the resonator portion that faces the capacitor portion in the first direction

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12580288B2Dielectric filter and dielectric resonator

Publication Date: 2026.03.17 MURATA MFG CO LTD

AI summary

A filter device includes a laminated body, plate electrodes, shield terminals, a plurality of resonator portions, and a plurality of capacitor portions facing the plurality of resonator portions in a Y-axis direction, respectively. Each of the resonator portions is formed by a plurality of resonant electrode elements. Each of the capacitor portions is formed by a plurality of capacitive electrode elements. A part in each of the plurality of resonant electrode elements that faces the capacitive electrode elements extends in a direction along the Y-axis direction. The plurality of capacitive electrode elements extend in a direction that intersects with the Y-axis direction.