Stacked Coupling Coil Layout for Low-Height Coupling Control
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Solution Overview
Problem
The existing stacked coupling coil components face challenges in achieving a desired coupling coefficient while minimizing the component's height, particularly when used as an LC filter for removing band noise, as increasing the distance between spiral coils to reduce the coupling coefficient results in increased component height.
Innovation Solution
A stacked coupling coil component with multiple conductor layers, where the first and second spiral coils overlap and are connected in series, and the third and fourth spiral coils are connected in parallel, allowing for adjustable coupling coefficients while maintaining a low component height. This configuration enables enhanced coupling between the first and second spiral coils and reduced coupling between the third and fourth spiral coils, allowing for specific frequency characteristics to be achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between spiral coils connected to one line and spiral coils connected to the other line is increased to reduce the coupling coefficient, then the coupling coefficient is reduced, but the height of the component increases
Solution Approach 1:
The patent transitions from adjusting coupling coefficient by vertical distance (one-dimensional adjustment) to adjusting it through the number of stacked conductor layers (multi-dimensional adjustment). By stacking multiple conductor layers with alternating connection patterns, the coupling coefficient can be precisely controlled through the number of layers without increasing the vertical height between corresponding coils in each layer.
Solution Approach 2:
The patent divides the coupling coil structure into multiple discrete conductor layers, each contributing a specific coupling effect. By segmenting the overall coupling function into multiple smaller layers that can be independently configured and connected in series/parallel, the total coupling coefficient becomes adjustable through the number and arrangement of these segmented layers, rather than requiring uniform distance adjustment throughout the structure.
2Adaptability or versatility
If multiple conductor layers are stacked to achieve desired coupling coefficient, then coupling adjustment is enabled, but the component height increases
Solution Approach 1:
The patent implements a nested structure where multiple conductor layers are stacked one within another in a compact arrangement. Each conductor layer is nested within the vertical space occupied by adjacent layers, allowing multiple coupling elements to be packed into a minimal height footprint. The alternating series-parallel connection pattern of these nested layers provides coupling adjustment without requiring additional vertical space.
3Reliability
If spiral coils are arranged to achieve strong magnetic coupling, then coupling coefficient increases, but the component becomes less adaptable to different frequency characteristics
Solution Approach 1:
The patent creates a dynamic coupling system where the effective coupling coefficient can be adjusted by changing the number of conductor layers and their connection configuration (series or parallel). This dynamic adjustability allows the same physical structure to adapt to different frequency characteristics and coupling requirements, transforming a static strong-coupling structure into a versatile system that can operate across multiple frequency ranges.
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
The solution allows for achieving a desired coupling coefficient while minimizing the component's height, effectively addressing the need for adjustable coupling in LC filters without increasing the component's height, and allows for the separation of differential signal components from common mode noise components.
Implementation Method 1
The first and second spiral coils overlap each other as viewed in the stacking direction, the first and third spiral coils are connected in series between the first and second terminal electrodes, and the second and fourth spiral coils are connected in series between the fourth and third terminal electrodes
Implementation Method 2
The first spiral coil may be wound in a first direction from the first terminal electrode to the second terminal electrode, and the second spiral coil may be wound in a second direction opposite to the first direction from the fourth terminal electrode to the third terminal electrode. With this configuration, it is possible to cut off a differential signal component to be input to the first and fourth terminal electrodes and to allow passage of a common mode noise component to be input to the first and fourth terminal electrodes
Data Source
AI summary
To provide a stacked coupling coil component capable of achieving a desired coupling coefficient while suppressing the height of the component. A stacked coupling coil component 1 has conductor layers L1, L3, and L5 respectively including spiral coils 11 to 13, conductor layers L2, L4, and L6 respectively including spiral coils 21 to 23, and a conductor layer L7 including spiral coils 31 and 41 which are disposed at mutually different planar positions. The spiral coils 11 to 13 and 21 to 23 overlap one another. The spiral coils 11 to 13 and 31 are connected in series between terminal electrodes E1 and E2, the spiral coils 21 to 23 and 41 are connected in series between terminal electrodes E4 and E3. This allows adjustment of a coupling coefficient, making it possible to achieve a desired coupling coefficient while suppressing the height of the component.