Multilayer Filter Inductor Layout for Magnetic Coupling Control
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Solution Overview
Problem
The integration of high-pass and low-pass filters in a stack results in unintended strong magnetic coupling between inductors, making it difficult to adjust attenuation poles and achieve desired characteristics in miniaturized band-pass filters.
Innovation Solution
A multilayered filter device is designed with a specific arrangement of inductors, where the openings of each inductor face each other in a particular direction, minimizing magnetic coupling and facilitating adjustment of characteristics while allowing miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a stack including a plurality of dielectric layers and conductor layers is used to miniaturize the band-pass filter, then the size of the filter is reduced, but unintended strong magnetic coupling occurs between the inductors in the stack
Solution Approach 1:
The patent applies asymmetry by arranging inductors with different orientations (first and second inductors with first orientation, third and fourth inductors with second orientation different from the first). This asymmetric arrangement breaks the symmetry that would otherwise cause strong magnetic coupling, allowing miniaturization while controlling unwanted magnetic interactions between adjacent inductors in the stacked configuration.
2Area of stationary object
If the stack is miniaturized, then the footprint is reduced, but adjustment of attenuation poles becomes difficult due to strong magnetic coupling
Solution Approach 1:
By using different orientations for different inductors (first orientation for first and second inductors, second orientation for third and fourth inductors), the patent reduces magnetic coupling strength. This enables easier adjustment of attenuation poles formed on low-frequency and high-frequency sides of the passband, as the magnetic coupling no longer prevents independent characteristic adjustment even in miniaturized 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 device achieves miniaturization and facilitates the adjustment of characteristics by reducing unwanted magnetic coupling between inductors, thereby improving the performance of the band-pass filter.
Implementation Method 1
reduction in size of the stack causes an unintended magnetic coupling occurring between the plurality of inductors in the stack to be too strong
Data Source
AI summary
A filter device includes a first filter including a first inductor, a second filter including a second inductor, a third filter including a third inductor, and a fourth filter including a fourth inductor. The first to fourth inductors are arranged in a manner that an opening of the first inductor and an opening of the third inductor face each other, an opening of the second inductor and an opening of the fourth inductor face each other, the opening of the first inductor and the opening of the second inductor do not face each other, and the opening of the third inductor and the opening of the fourth inductor do not face each other.