Multilayer Common-Mode Choke Coil Layout for 25-30 GHz Noise Suppression
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Solution Overview
Problem
Current multilayer common-mode choke coils are inadequate in suppressing common-mode noise components at frequencies above 2.4 GHz, particularly in the range of 25 GHz to 30 GHz and beyond, due to limitations in their design and materials.
Innovation Solution
A multilayer common-mode choke coil design featuring a multilayer body with stacked non-conductor layers, incorporating first and second coils with specific path lengths and terminal electrodes, where the sum of the path lengths of the coils is less than or equal to 3.5 mm, optimizing the transmission characteristics for high-frequency noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multilayer common-mode choke coil designs are used, then the structure is simple and manufacturing is easy, but the common-mode noise suppression capability at frequencies above 2.4 GHz (particularly 25 GHz to 30 GHz and beyond) is insufficient
Solution Approach 1:
The patent utilizes the thickness dimension of the multilayer body to route the coils, allowing the coils to be embedded within the stacked non-conductor layers rather than being confined to a single plane. This three-dimensional arrangement enables effective common-mode noise suppression at high frequencies while maintaining a compact overall structure.
Solution Approach 2:
The patent optimizes the coil path length parameter by configuring the sum of the path lengths of the first and second coils to be within a specific range (0.5 mm to 3.5 mm). This parameter control ensures that the common-mode noise suppression peak occurs at the desired high frequency range (25 GHz to 30 GHz or higher) while maintaining manufacturability.
2Reliability
If the coil path length is increased to improve common-mode noise suppression, then the suppression effectiveness improves, but the device size increases and high-frequency performance (above 30 GHz) deteriorates
Solution Approach 1:
The patent establishes an optimal parameter range for the sum of coil path lengths (0.5 mm to 3.5 mm) that simultaneously achieves effective common-mode noise suppression and maintains high-frequency transmission performance above 30 GHz. This parameter optimization resolves the trade-off between suppression effectiveness and high-frequency speed performance.
Solution Approach 2:
By utilizing the vertical thickness dimension of the multilayer structure, the patent enables sufficient coil path length for effective noise suppression without increasing the planar footprint, thereby maintaining compact device size and preserving high-frequency transmission characteristics.
3Volume of moving object
If the coil path length is decreased to maintain compact size, then the device remains small, but the common-mode noise suppression capability at 25 GHz to 30 GHz and above is insufficient
Solution Approach 1:
The patent transitions from two-dimensional planar coil routing to three-dimensional routing within the multilayer thickness, enabling sufficient effective path length for noise suppression while maintaining a compact external device size. The coils are configured to extend through multiple layers, utilizing the vertical dimension to achieve the required electrical length.
Solution Approach 2:
The patent employs a multilayer composite structure with stacked non-conductor layers having specific dielectric properties that enable compact coil configuration. The composite structure allows for optimized electromagnetic field distribution, achieving effective common-mode noise suppression in a reduced device volume.
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 design effectively suppresses common-mode noise components at higher frequencies, ensuring a minimum transmission characteristic peak position greater than or equal to 24 GHz and maintaining a transmission coefficient of -3 dB or better at 30 GHz, thereby enhancing high-frequency performance.
Implementation Method 1
a first coil (11) and a second coil (12) which are incorporated in the multilayer body (2)
Data Source
AI summary
A common-mode choke coil includes a multilayer body, a first coil, a second coil, a first terminal electrode, a second terminal electrode, a third terminal electrode, and a fourth terminal electrode. The multilayer body includes plural non-conductor layers. The first and second coils are incorporated in the multilayer body. The first and second terminal electrodes are connected to the first coil. The third and fourth terminal electrodes are connected to the second coil. The first coil has a path length L1, the second coil has a path length L2, and the sum of the path length L1 and the path length L2 is less than or equal to 3.5 mm.