Common Mode Filter with Adjustable Extension Element
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Solution Overview
Problem
The design complexity and cost of common mode filters are increased due to factors like materials, parameter variations, and stacked structures in PCB manufacturing, making it challenging to efficiently suppress electromagnetic interference in miniaturized electronic devices.
Innovation Solution
A common mode filter design incorporating an adjustment circuit connected to an extension element, which allows for the adjustment of frequency response, reducing design complexity and cost by electrically connecting the extension element to the ground element and enabling connection to at least one adjustment circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If PCB manufacturing technology is used to form common mode filters, then the filters become popular for miniaturized electronic devices, but processing factors such as materials, parameter variation, and stacked structures increase design complexity and cost
Solution Approach 1:
The patent introduces an extension element that can be electrically connected to the ground element through conductive vias, creating an adjustable configuration. This dynamic structure allows the common mode filter to adapt its electrical characteristics by connecting adjustment circuits to the extension element, thereby reducing design complexity while maintaining miniaturization benefits.
2Volume of moving object
If PCB manufacturing technology is used to form common mode filters, then the filters become popular for miniaturized electronic devices, but processing factors such as materials, parameter variation, and stacked structures increase design cost
Solution Approach 1:
The extension element serves multiple functions: it extends the ground element's functionality, provides a connection interface for adjustment circuits, and enables frequency response tuning. This multi-functional design reduces the need for separate components, thereby lowering design cost while maintaining the compact form factor required for miniaturized devices.
3Object-affected harmful factors
If the ground element has a slot with a ground line extending through it, then electromagnetic interference suppression is improved, but the structure becomes more complex
Solution Approach 1:
The ground element is segmented into a ground portion with a slot and a ground line that extends through the slot. This segmentation creates an effective electromagnetic shielding structure while maintaining manufacturing feasibility. The slot configuration specifically targets EMI suppression without requiring overly complex three-dimensional structures.
Data Source
AI summary
A common mode filter includes a ground element, a transmission line pair and an extension element, which are disposed in first to third signal layers of a circuit board. The ground element includes a ground portion and a first ground line electrically connected with each other. The first ground line is disposed in a slot of the ground portion, and extends from a bottom portion to an opening of the slot. An orthogonal projection of the transmission line pair on the first signal layer is partially overlapped with an orthogonal projection of the ground portion on the first signal layer. The orthogonal projection of the transmission line pair on the first signal layer is not overlapped with an orthogonal projection of the first ground line on the first signal layer. The extension element is electrically connected to the first ground line through at least one conductive via.