Multilayer Filter Layout for Stronger Magnetic Coupling
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Solution Overview
Problem
Conventional multilayer filters have limitations in improving attenuation characteristics due to the distance between LC parallel resonance units, which affects magnetic coupling and resulting attenuation steepness.
Innovation Solution
The multilayer filter design includes an LC circuit unit with inductors and capacitors configured in parallel and series, where the inductors of the LC circuit unit are not disposed between the first and second LC parallel resonance units, allowing for increased magnetic coupling and reduced distance between attenuation peaks, thereby enhancing attenuation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the LC circuit unit is disposed between the first and second LC parallel resonance units, then the distance between resonance units is reduced, but the magnetic coupling between inductors is weakened
Solution Approach 1:
The patent extracts the LC circuit unit from the position between the first and second LC parallel resonance units and places it outside this region. Specifically, the inductor of the LC circuit unit is disposed outside the region between the conductor patterns of the first and second inductors of the LC parallel resonance units. This extraction eliminates the interference of the LC circuit unit on the magnetic coupling path between the resonance units, thereby maintaining strong magnetic coupling while still allowing compact overall layout.
2Reliability
If the distance between attenuation peaks is increased, then attenuation steepness is improved, but the frequency band may be affected
Solution Approach 1:
The patent utilizes parameter changes in the magnetic coupling between inductors to control the distance between attenuation peaks. By adjusting the magnetic coupling strength through the spatial arrangement of inductors (placing the LC circuit unit outside the region between resonance units), the distance between attenuation peaks can be optimized. This allows achieving steep attenuation characteristics while maintaining appropriate frequency band coverage through precise parameter control of the magnetic coupling.
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 results in a steeper attenuation profile and improved attenuation characteristics by increasing the distance between attenuation peaks and allowing for deeper attenuation in a narrow frequency band.
Implementation Method 1
the first inductor of the first LC parallel resonance unit and the second inductor of the second LC parallel resonance unit are magnetically coupled
Data Source
AI summary
In a multilayer filter, a first LC parallel resonance unit, a second LC parallel resonance unit, and an LC circuit unit are configured in an element body, in which the LC circuit unit is connected between the first LC parallel resonance unit and the second LC parallel resonance unit in a path between a first terminal electrode and a second terminal electrode, a conductor pattern constituting an inductor of the LC circuit unit is not disposed between a conductor pattern constituting a first inductor of the first LC parallel resonance unit and a conductor pattern constituting a second inductor of the second LC parallel resonance unit in the element body, and the first inductor of the first LC parallel resonance unit and the second inductor of the second LC parallel resonance unit are magnetically coupled.