LC Composite Resonator Layout for Compact High-Q Coil Coupling
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Solution Overview
Problem
Existing multilayer bandpass filters with helical coils have increased surface-direction size and suboptimal coupling due to side-by-side arrangement of coil electrodes, limiting size reduction and coupling flexibility while maintaining a high Q-value for resonators.
Innovation Solution
The configuration includes two helical inductors with overlapping arrangements and shared closed magnetic circuits, reducing the occupied area and increasing mutual inductance, while minimizing parasitic capacitance by arranging electrodes with small potential differences and using a ground electrode to stabilize inductance and prevent unnecessary magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If two coil electrodes are arranged side by side in a multilayer bandpass filter, then the coupling between coils can be increased by decreasing the horizontal distance, but the surface-direction size of the multilayer substrate undesirably increases
Solution Approach 1:
The patent transitions from a two-dimensional side-by-side arrangement to a three-dimensional overlapping arrangement where helical coils are positioned at different heights (z-axis) and overlap when viewed from the top. This vertical stacking approach enables strong magnetic coupling through shared magnetic flux paths while minimizing the horizontal footprint of the device.
Solution Approach 2:
The patent implements nested positioning where one helical coil is placed within the projection area of another coil when viewed from above, creating an overlapping configuration. This nesting strategy allows the coils to occupy the same planar space at different vertical levels, achieving compact size reduction while maintaining coupling efficiency through magnetic field interaction.
2Area of stationary object
If two coil electrodes are arranged side by side, then the surface-direction size is reduced, but coupling as strong as that obtained by arranging the coil electrodes to touch each other may not be obtained
Solution Approach 1:
By utilizing the vertical dimension for coil placement, the patent achieves strong coupling without requiring the coils to touch or be in close horizontal proximity. The overlapping arrangement at different heights creates effective magnetic coupling through shared flux paths while maintaining a larger horizontal separation for compact packaging.
Solution Approach 2:
The patent introduces the dielectric layers and magnetic flux as intermediaries that facilitate coupling between the overlapping helical coils. The magnetic field acts as a mediator that transfers energy between coils separated in space, enabling strong coupling without direct physical contact or minimal horizontal separation.
3Area of stationary object
If the occupied area is reduced by overlapping arrangement, then the entire size is reduced, but the Q-value of resonators may decrease
Solution Approach 1:
The patent applies local quality optimization by carefully designing the overlapping region of the helical coils to maintain appropriate spacing and geometric characteristics that preserve Q-value. The local arrangement of conductors and dielectric materials in the overlapping area is optimized to minimize losses while achieving compact size, ensuring that the resonator quality factor remains high despite the reduced overall footprint.
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 reduces the overall size of the resonator while maintaining a high Q-value, broadening the settable range of coupling and improving design flexibility by enhancing mutual inductance and suppressing parasitic capacitance.
Implementation Method 1
The two neighboring coil electrodes are coupled through a magnetic field
Implementation Method 2
mutual inductance is increased
Implementation Method 3
closed magnetic circuits of the two inductors are shared
Implementation Method 4
parasitic capacitance between the line electrodes of the helical electrodes can be suppressed and minimized
Data Source
AI summary
An LC composite component capable of reducing an overall size while keeping a Q-value of a resonator at a high level and increasing coupling flexibility of resonators includes two capacitor electrodes and two input/output terminal electrodes extending therefrom provided on a first dielectric layer. A ground electrode and another capacitor electrode are provided on second and sixth dielectric layers, respectively. Two substantially linear line electrodes are provided on a third dielectric layer. Two substantially U-shaped line electrodes are provided on a fourth dielectric layer. Two substantially crank-shaped line electrodes are provided on a fifth dielectric layer. Six via electrodes arranged to connect ends of respective line electrodes are provided on the third, fourth, and fifth dielectric layers. These via electrodes and line electrodes constitute electrodes of a double helix structure.