Filter Device With Skewed Magnetic Fields
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Solution Overview
Problem
Existing bandpass filters with resonators disposed in the same plane suffer from reduced attenuation characteristics due to magnetic field interference between adjacent resonators.
Innovation Solution
The filter device incorporates resonators with plate conductors extending in different directions, including a third resonator with an inductor via that reduces magnetic field coupling by positioning magnetic fields in a skewed manner, thereby improving the attenuation characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resonators are disposed in the same plane in the dielectric, then the filter structure is simple and compact, but the attenuation characteristic is reduced due to magnetic field interference between adjacent resonators
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional configuration by having the inductor via extend in the stacking direction (Z-axis) between dielectric layers. This vertical dimensionality change separates the magnetic fields of adjacent resonators in the stacking direction, reducing magnetic coupling while maintaining a compact overall structure.
Solution Approach 2:
The patent introduces asymmetry in the resonator configurations - the first and second resonators use plate conductors extending in the X-axis direction, while the third resonator uses an inductor via extending in the Z-axis direction. This asymmetric design creates different magnetic field orientations that reduce interference between adjacent resonators.
2Volume of moving object
If adjacent resonators generate magnetic fields in different directions, then the filter can be compact, but the magnetic fields affect one another resulting in reduced attenuation characteristic
Solution Approach 1:
The patent converts the potentially harmful magnetic field interference into a beneficial separation mechanism. By orienting the inductor via of the third resonator vertically in the stacking direction while plate conductors of other resonators extend horizontally, the magnetic fields naturally separate in different spatial directions, reducing mutual interference while maintaining compact dimensions.
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 configuration enhances the filter's ability to prevent magnetic coupling between resonators, leading to improved attenuation characteristics and reduced signal propagation in non-passbands.
Implementation Method 1
The third resonator includes a capacitor electrode opposite to the second electrode, and an inductor via connected to the capacitor electrode and the first electrode. The inductor via extends in a third direction from the first electrode toward the second electrode.
Data Source
AI summary
A filter device includes a dielectric, first and second electrodes in the dielectric and connected to a ground terminal, and first to third resonators. The first and second resonators are between the first and second electrodes. The first resonator is connected to an input terminal, and the second resonator is connected to an output terminal. The third resonator is between the first and second resonators. The first resonator includes a first plate conductor connected to the input terminal and the ground terminal. The second resonator includes a second plate conductor connected to the output terminal and the ground terminal. The first and second plate conductors extend in the dielectric in an X-axis direction. The first to third resonators are arranged in a Y-axis direction. The third resonator includes a capacitor electrode opposite to the second electrode, and an inductor via connected to the capacitor electrode and the first electrode.