Laminated Filter Height Reduction via Planar Pattern Segmentation
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Solution Overview
Problem
Existing laminated filters face challenges in miniaturization and height reduction due to the need for multiple insulation layers and suffer from deteriorated Q characteristics due to eddy current loss and undesired inductance components generated by magnetic flux and external electrode connections.
Innovation Solution
The laminated filter design separates coil and capacitor patterns to avoid overlap in the lamination direction, reduces the number of insulation layers, and connects coil patterns directly to capacitor patterns through extension patterns to minimize eddy current loss and undesired inductance components, allowing for independent control of resonant frequencies and coupling capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulation layers are laminated to achieve desired filter characteristics, then the filter performance is improved, but the height of the filter increases
Solution Approach 1:
The patent combines coil patterns and capacitor patterns on the same insulation layer, merging functions that were previously separated into different layers. This integration reduces the total number of insulation layers required while maintaining the necessary filter characteristics, thereby reducing height without sacrificing performance.
Solution Approach 2:
The patent redistributes patterns within the planar dimension of the insulation layer rather than stacking them vertically. By arranging coil and capacitor patterns side-by-side or in adjacent regions on the same layer, the design transitions from a vertical stacking approach to a horizontal layout approach, reducing height while preserving functionality.
2Device complexity
If coil patterns and capacitor patterns are laminated on one another in the lamination direction, then the structure is compact, but eddy current is generated in the capacitor patterns due to magnetic flux from the coil patterns, deteriorating the Q characteristic
Solution Approach 1:
The patent segments the insulation layer into distinct regions: a first region for coil patterns and a second region for capacitor patterns. This spatial segmentation prevents magnetic flux from coil patterns from intersecting capacitor patterns, eliminating eddy current generation while maintaining a compact structure through efficient planar arrangement.
Solution Approach 2:
The patent assigns different functional qualities to different regions of the insulation layer. The first region is optimized for magnetic field generation (coil patterns) while the second region is optimized for capacitance (capacitor patterns), ensuring that each pattern type operates in an electromagnetic environment suited to its function, thereby preventing Q characteristic deterioration.
3Device complexity
If coil section and capacitor section are electrically connected through external electrodes, then the filter structure is simplified, but undesired inductance components are generated, deteriorating the Q characteristic
Solution Approach 1:
The patent merges the electrical connection function into the same insulation layer by providing extension patterns that directly connect coil patterns and capacitor patterns. This eliminates the need for separate external electrode connections, simplifying the structure while avoiding the inductance problems associated with external electrode paths.
Solution Approach 2:
The patent introduces extension patterns as intermediary conductive elements on the insulation layer that facilitate direct electrical connection between coil and capacitor patterns. These extension patterns serve as low-inductance mediators, replacing the high-inductance external electrode connection path and thereby improving the Q characteristic.
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 design achieves a reduced height, improved Q characteristic, and enhanced filter performance by minimizing eddy current loss and undesired inductance, enabling better miniaturization and design flexibility.
Implementation Method 1
when current is supplied to the coil patterns 111a to 116a, a magnetic flux is generated through the capacitor patterns 131a to 133a. Accordingly, there arises a problem in that eddy current is generated in the capacitor patterns 131a to 133a and a Q characteristic of the laminated filter 101 is deteriorated due to eddy current loss.
Implementation Method 2
The capacitor section 130 is configured such that insulation layers 131 to 133 having capacitor patterns thereon are laminated on one another. Capacitor patterns 131a and 133a are formed substantially in centers of the insulation layers 131 and 133, respectively, and have a substantially rectangular shape.
Data Source
AI summary
A laminated filter includes a first insulation layer including first and second coil patterns and a first capacitor pattern and a second insulation layer including third and fourth coil patterns and second and third capacitor patterns. The first and second coil patterns are located near one longer side of the first insulation layer and connected to the third and fourth coil patterns through penetration electrodes in the first insulation layer. The third and fourth coil patterns extend to ends of the second insulation layer through extension patterns and are connected to external electrodes to define input and output inductors. The first capacitor pattern is located near the other longer side of the first insulation layer and connected to an external ground electrode through an extension pattern. The first capacitor pattern faces the second and third capacitor patterns with the first insulation layer interposed therebetween to define input and output capacitors.