Multilayer Filter Circuit Inductor Misalignment Compensation
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Solution Overview
Problem
Misalignment between dielectric layers in multilayer filter circuits can cause significant changes in inductance ratios and mutual inductance, affecting filter characteristics, especially when inductors are on different layers.
Innovation Solution
A filter circuit design where the first, second, and third inductors are connected in a T-shaped pattern on the same dielectric layers, ensuring that any misalignment affects their inductances proportionally, maintaining the balance of magnetic flux directions and minimizing changes in mutual inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If inductors are provided on different layers to prevent electromagnetic coupling, then electromagnetic coupling between inductors is reduced, but misalignment between dielectric layers causes significant changes in inductance ratios and mutual inductance
Solution Approach 1:
The patent transitions from a three-dimensional stacking arrangement (inductors on different layers) to a two-dimensional planar arrangement (all inductors on the same layer). This dimensional change eliminates the misalignment problem inherent in multilayer stacking while maintaining electromagnetic isolation through spatial distribution on the same plane.
Solution Approach 2:
The patent uses multiple conductive patterns that are substantially identical in shape and size (L11 and L12 both have substantially the same shape and pattern width). These copied patterns ensure that when misalignment occurs, all inductors are affected equally, preserving the inductance ratio and mutual inductance characteristics.
2Productivity
If inductors are arranged close to each other to achieve desired filter characteristics, then filter frequency characteristics are optimized, but misalignment causes deviation in distance between inductors affecting mutual inductance
Solution Approach 1:
The patent changes the geometric parameters of the conductive patterns (shape, size, spacing) to achieve the desired inductance values and mutual inductance ratios. By carefully designing these parameters, the filter achieves optimal frequency characteristics while the patterns' symmetry ensures that misalignment affects all inductors equally, maintaining parameter ratios.
Solution Approach 2:
The patent employs asymmetric spacing arrangements where L11 and L12 are positioned at specific distances from L13 (with L11 and L12 being substantially equal distances from L13). This asymmetric yet symmetric arrangement allows optimization of mutual inductance values while maintaining stability against misalignment through the symmetry of the overall configuration.
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 prevents or minimizes the impact of misalignment on filter characteristics, maintaining consistent frequency attenuation and reducing the risk of inductance changes due to electromagnetic coupling.
Implementation Method 1
the inductors L12 and the inductor L13, which are disposed close to each other, becoming electromagnetically coupled with each other
Data Source
AI summary
A bandpass filter includes a multilayer body, which includes a plurality of dielectric layers stacked on top of one another, a first inductor and a second inductor connected in series with each other, and a third inductor connected to a connection point between the first and second inductors, and a ground potential. The first inductor is defined by substantially open-loop-shaped first electrode patterns provided on the dielectric layers being superposed with one another in the stacking direction of the multilayer body. The second inductor and the third inductor are defined by second electrode patterns and third electrode patterns provided on the dielectric layers being superposed with one another in the stacking direction.