Multilayer Inductor Stack Layout for Compact Low-Coupling Filters
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Solution Overview
Problem
Compact mobile communication devices face challenges in miniaturization due to strong electromagnetic coupling between inductors in LC resonators, which increases the size of branching filters and other multilayer electronic components.
Innovation Solution
A multilayer electronic component design featuring inductors wound about axes parallel to the stacking direction, with specific orientation and overlap configurations to reduce electromagnetic coupling, allowing for downsizing while maintaining desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the filter is reduced in size, then the footprint of the mobile communication apparatus is reduced, but electromagnetic coupling between inductors becomes too strong
Solution Approach 1:
The patent utilizes the stacking direction (vertical dimension) to arrange inductors with orthogonal axes, transforming a 2D planar arrangement problem into a 3D spatial arrangement. By winding inductors about axes that are orthogonal to each other in three-dimensional space, the patent reduces electromagnetic coupling while maintaining a compact footprint, as the magnetic fields of orthogonally oriented inductors interfere less with each other compared to coplanar arrangements.
Solution Approach 2:
The patent integrates multiple inductors with different orientations within a single dielectric stack, nesting them in a compact configuration. The inductors are wound about orthogonal axes and integrated into the same stack structure, allowing them to occupy overlapping projection areas while maintaining spatial separation through orthogonal orientation, thereby reducing electromagnetic coupling without increasing footprint.
2Object-generated harmful factors
If inductors are disposed with orthogonal axes to reduce magnetic coupling, then electromagnetic coupling is reduced, but unnecessary space is generated and size increases
Solution Approach 1:
The patent employs orthogonal axes in three-dimensional space to orient inductors, allowing their magnetic fields to be decoupled while their projections overlap in the planar view. This vertical stacking with orthogonal orientations eliminates the need for lateral separation that would otherwise be required to reduce magnetic coupling, thus avoiding unnecessary space generation.
Solution Approach 2:
The patent merges multiple inductors with orthogonal orientations into a single integrated dielectric stack structure. By combining the inductors within the same stack and allowing their projections to overlap, the patent achieves compact sizing while the orthogonal orientations naturally reduce magnetic coupling between them.
3Object-generated harmful factors
If all inductors are disposed with orthogonal axes, then magnetic coupling is reduced, but a larger unnecessary space is generated in the stack
Solution Approach 1:
The patent extends the orthogonal axis arrangement to three inductors in three-dimensional space, with each inductor wound about a different orthogonal axis. This 3D orthogonal arrangement allows all inductors to be compactly integrated within the stack while their magnetic fields remain decoupled due to the orthogonal orientations, preventing the generation of excessive space.
Solution Approach 2:
The patent nests three inductors with orthogonal orientations within a single dielectric stack, allowing their projections to overlap in the planar view while maintaining spatial separation through orthogonal 3D arrangement. This nested configuration minimizes the overall stack size while achieving the goal of reducing magnetic coupling among all inductors.
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 effectively reduces electromagnetic coupling among inductors, enabling the miniaturization of multilayer electronic components without compromising performance, thus addressing the size and footprint requirements of compact mobile communication devices.
Implementation Method 1
electromagnetic coupling between the two inductors can be too strong. This has sometimes interfered with the implementation of desired characteristics.
Implementation Method 2
when the filter includes the two inductors, magnetic coupling between the two inductors can be reduced by setting the axis of one of the inductors and the axis of the other inductor to be orthogonal to each other.
Data Source
AI summary
An electronic component includes a stack and first to third inductors. Area of a region obtained by perpendicularly projecting a first space including a first axis and surrounded by the first inductor onto an XZ plane is larger than area of a region obtained by perpendicularly projecting a second space including a second axis and surrounded by the second inductor onto a YZ plane. The third inductor is disposed such that a third axis does not intersect the first space but intersects the second space.