Band Pass Filter Inductor Segmentation for Magnetic Coupling
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Solution Overview
Problem
Existing band pass filters face challenges in easily adjusting magnetic coupling between inductors of LC parallel resonators, leading to uneven magnetic coupling strengths and mismatched impedance, which affects reflection characteristics and filter performance.
Innovation Solution
The band pass filter design includes a multilayer body with insulating layers laminated together, where the inductors of LC parallel resonators are divided into parallel-connected components to allow for easy adjustment of magnetic coupling strengths, ensuring equalized magnetic couplings between adjacent inductors through spiral electrode configurations and winding directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inductors of adjacent LC parallel resonators are magnetically coupled using conventional configurations, then the filter structure is simple, but the magnetic coupling strengths become uneven and difficult to adjust
Solution Approach 1:
The inductor of the intermediate-stage LC parallel resonator is divided into two separate inductors (first inductor and second inductor). This segmentation allows independent adjustment of magnetic coupling strengths with adjacent resonators, enabling easy control of coupling parameters without requiring complex external adjustment mechanisms.
Solution Approach 2:
Different inductors are configured with different winding directions (first winding direction for the first inductor, second winding direction for the second inductor). This local differentiation in quality allows each inductor to provide optimized magnetic coupling characteristics for its specific position in the filter, achieving uniform coupling strengths through localized structural optimization.
2Reliability
If the magnetic coupling between inductors is not evenly adjusted, then the device structure remains simple, but the impedance becomes mismatched and reflection characteristics deteriorate
Solution Approach 1:
By dividing the inductor into two separate components, the patent enables independent optimization of magnetic coupling strengths. This segmentation allows each coupling interface to be independently adjusted to achieve uniform coupling, which directly improves impedance matching and reflection characteristics without requiring complex external adjustment mechanisms.
Solution Approach 2:
The two inductors are configured with opposite winding directions (first winding direction and second winding direction), creating an asymmetric configuration that enables differential control of magnetic coupling strengths. This asymmetric design allows precise adjustment of coupling parameters to achieve uniform coupling and optimal impedance matching across the filter.
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 design enables easy adjustment and equalization of magnetic coupling strengths, resulting in consistent reflection characteristics and matched impedance across input/output terminals, improving the band pass filter's performance and stability.
Implementation Method 1
The inductors of the adjacent LC parallel resonators are magnetically coupled to one another
Data Source
AI summary
A band pass filter includes parallel resonators. An inductor of a first parallel resonator at an intermediate stage is divided into a first inductor and a second inductor connected in parallel with each other. The first inductor and an inductor of a second parallel resonator are in magnetic coupling with each other, and the second inductor and an inductor of a third parallel resonator are in magnetic coupling with each other.