Multilayer LC Filter Inductor Layout for Height Reduction
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Solution Overview
Problem
Multilayer LC filters face challenges in reducing height while maintaining desired frequency characteristics due to the dependence of inductance value on via conductor length, and magnetic coupling between separated inductors is weakened when inductors are configured differently to accommodate height reduction.
Innovation Solution
The multilayer LC filter design includes a multilayer body with inductors defined by conductor patterns wound in a planar direction or C-shaped patterns connected by via conductors, allowing for reduced height without lowering inductance values, and strategic placement and overlap of inductor air-core portions to enhance magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If via conductor length is reduced to decrease filter height, then height is reduced, but inductance value decreases
Solution Approach 1:
The inductor conductor pattern is configured to extend in the planar direction (horizontal dimension) rather than relying solely on the vertical via conductor length. By winding the conductor pattern in a planar direction or using C-shaped patterns, the inductance is generated through the horizontal path length and loop area, decoupling the inductance value from the via conductor length and enabling height reduction while maintaining inductance.
Solution Approach 2:
The inductor is segmented into multiple components: C-shaped conductor patterns on different dielectric layers connected by via conductors. This segmentation allows the inductance to be distributed across multiple planar elements rather than relying on a single long via conductor, enabling height reduction while maintaining total inductance value through the combined effect of multiple segments.
2Length of moving object
If inductors are configured differently to accommodate height reduction, then height is reduced, but magnetic coupling between separated inductors is weakened
Solution Approach 1:
Inductors are arranged in a nested configuration where air-core portions of separated inductors overlap with each other when viewed in the lamination direction. This nesting creates multiple overlapping magnetic flux paths between separated inductors, strengthening the magnetic coupling effect even when inductors are positioned at different heights or locations within the compact multilayer structure.
Solution Approach 2:
The magnetic coupling is enhanced by creating a composite magnetic path that utilizes both the dielectric layers and air regions. The air-core portions of inductors are strategically positioned to overlap, creating a composite structure where magnetic flux can efficiently couple through both dielectric and air paths, maintaining strong coupling despite height reduction and different inductor configurations.
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 design achieves desired frequency characteristics and maintains strong magnetic coupling between inductors, even at reduced heights, ensuring necessary inductance values and impedance matching.
Implementation Method 1
inductors defined by inductor conductor patterns... necessary magnetic coupling between inductors defining the LC parallel resonators being appropriately performed
Implementation Method 2
capacitor conductor patterns provided in interlaminar areas of the dielectric layers... a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor are each defined by capacitance generated between the capacitor conductor pattern and the ground conductor pattern
Implementation Method 3
a multilayer body having a rectangular or substantially rectangular parallelepiped shape in which a plurality of dielectric layers are laminated
Data Source
AI summary
A multilayer body includes a first inductor and a second inductor provided in a first planar region, and a third inductor and a fourth inductor provided in a second planar region when viewed in a lamination direction of dielectric layers of the multilayer body. When the multilayer body is viewed in a direction perpendicular or substantially perpendicular to the lamination direction of the dielectric layers, the first inductor and the fourth inductor are provided in a first thickness region, and the second inductor and the third inductor are provided in a second thickness region.