Multilayer Filter Wall Structure for Coupling and Flux Control
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Solution Overview
Problem
Multilayer filters with vertical winding type inductors face challenges such as electromagnetic coupling with adjacent inductors, which degrades performance, and magnetic flux disturbance due to grounded wall portions.
Innovation Solution
A multilayer filter design that includes a grounded wall portion with a penetrating portion between the first and second inductors, where the second inductor is a vertical winding type, allowing magnetic flux to pass through and preventing obstruction, thereby improving the Q factor and overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vertical winding type inductor is used to obtain high in-band insertion characteristics, then in-band insertion loss characteristics are improved, but electromagnetic coupling with adjacent inductors increases and degrades performance
Solution Approach 1:
A wall portion is introduced as an intermediary structure between adjacent vertical winding type inductors. This wall portion acts as a magnetic flux barrier that redirects and contains the magnetic flux within each inductor's own space, preventing electromagnetic coupling with adjacent inductors while preserving the high in-band insertion characteristics of the vertical winding configuration.
2Object-generated harmful factors
If a grounded wall portion is provided between inductors to inhibit electromagnetic coupling, then electromagnetic coupling is reduced, but magnetic flux of the vertical winding type inductor is disturbed
Solution Approach 1:
The wall portion is designed with non-uniform dimensions, having different sizes in the laminating direction at different locations. This local variation in the wall portion's geometry allows optimization of magnetic flux distribution - the wall portion provides sufficient barrier function to reduce electromagnetic coupling while maintaining adequate space for magnetic flux circulation in specific regions where it is most needed.
3Reliability
If the size of the penetrating portion in the laminating direction is increased to allow magnetic flux passage, then Q factor is improved, but electromagnetic coupling may increase
Solution Approach 1:
The penetrating portion's size is optimized locally - it is large enough in the laminating direction to permit adequate magnetic flux passage and improve Q factor, while the wall portion extends sufficiently in other dimensions to maintain electromagnetic coupling suppression. This localized dimensional optimization balances the competing requirements of flux passage and coupling inhibition.
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
The proposed design enhances the performance of multilayer filters by inhibiting electromagnetic coupling and ensuring unobstructed magnetic flux, leading to improved in-band insertion loss characteristics and isolation characteristics.
Implementation Method 1
magnetic flux of the second inductor, which is the vertical winding type inductor, can pass through the penetrating portion
Implementation Method 2
electromagnetic coupling between the first inductor and the second inductor can be inhibited
Data Source
AI summary
A multilayer filter includes: an element body formed by laminating a plurality of insulator layers; a first inductor and a second inductor; and a wall portion disposed between the first inductor and the second inductor and grounded, wherein at least the second inductor is a vertical winding type inductor of which a winding axis extends in a direction orthogonal to a laminating direction in which the plurality of insulator layers are laminated, a penetrating portion penetrating in a facing direction in which the first inductor and the second inductor face each other is formed in the wall portion, and a size of the penetrating portion in the laminating direction is larger than a size of one insulator layer.