Low Pass Filter Attenuation Pole Interval Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing low pass filters face difficulties in adjusting the interval between attenuation poles without compromising performance, as altering the magnetic coupling between inductors leads to deterioration of filter characteristics and inability to achieve desired attenuation characteristics.
Innovation Solution
A low pass filter design featuring a multilayer body with LC parallel resonators and a capacitor connected in parallel with the inductors, allowing for adjustment of the interval between attenuation poles through capacitive coupling, thereby reducing inductive coupling and enabling precise control of the interval without changing the inductor structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the magnetic coupling between the first inductor and the second inductor is adjusted by changing the distance therebetween, then the interval between attenuation poles can be adjusted, but the performance characteristics of the entire filter deteriorate and fine adjustments become difficult
Solution Approach 1:
The patent changes the coupling mechanism from magnetic coupling (by adjusting inductor distance) to capacitive coupling (by adjusting capacitor distance). This allows the interval between attenuation poles to be adjusted by changing the distance between capacitors, while maintaining stable inductor structures and avoiding deterioration of filter performance characteristics.
Solution Approach 2:
The patent replaces the mechanical adjustment of inductor distance (magnetic coupling) with the adjustment of capacitor distance (capacitive coupling). This substitution enables fine adjustments of the attenuation pole interval without the structural changes and Q value deterioration associated with modifying inductor positions.
2Ease of operation
If the structures of the first inductor and the second inductor are changed to adjust magnetic coupling strength, then the interval between attenuation poles can be adjusted, but the Q value deteriorates and desired attenuation characteristics cannot be obtained
Solution Approach 1:
The patent changes the adjustable parameter from inductor structure/distance to capacitor distance. By adjusting only the distance between capacitors, the interval between attenuation poles can be controlled without modifying inductor structures, thereby preserving the Q value and achieving desired attenuation characteristics.
Solution Approach 2:
The patent separates the adjustment function from the inductor structures and assigns it to the capacitor arrangement. This segmentation allows independent optimization of inductor Q value and attenuation pole interval, enabling precise control of filter characteristics without compromising either parameter.
3Force
If the distance between the first inductor and the second inductor is increased to improve magnetic coupling, then coupling strength increases, but fine adjustments are not easily performed
Solution Approach 1:
The patent changes the coupling mechanism from magnetic to capacitive, allowing fine adjustments of coupling strength by precisely controlling capacitor distance. This provides better controllability and finer adjustment capability compared to the coarse adjustments required when changing inductor distance for 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
Enables easy adjustment of the interval between attenuation poles, maintaining performance and allowing for desired attenuation characteristics by optimizing capacitive and inductive coupling.
Implementation Method 1
The first capacitor and the first inductor form a first LC parallel resonator
Implementation Method 2
the second capacitor and the second inductor form a second LC parallel resonator
Implementation Method 3
adjust the strength of magnetic coupling between the first inductor and the second inductor
Implementation Method 4
a first capacitor electrically connected in parallel with at least a portion of the first inductor and a portion of the second inductor
Data Source
AI summary
A low pass filter includes a first via-hole conductor connected to a first end portion of a first inductor and a third end portion of a second inductor and extending to another side in a lamination direction with respect to a second end portion of the first inductor and a fourth end portion of the second inductor, and a first capacitor electrically connected in parallel with at least a portion of the first inductor and a portion of the second inductor and defined by a first capacitor conductor layer. The low pass filter allows the interval between attenuation poles to be easily adjusted.