Microstrip Filter for Differential Signal Noise Suppression
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Solution Overview
Problem
Conventional filters for electronic devices, which rely on passive elements like capacitors, resistors, and inductors, consume layout space and hinder miniaturization efforts due to increased electromagnetic interference (EMI) as electronic devices operate at faster signal speeds, affecting their normal operation.
Innovation Solution
A filter design utilizing a multi-layer substrate with microstrip lines that match the impedance of transmission lines, eliminating the need for passive elements by electrically connecting one end of each microstrip line to a transmission line while keeping the other end floating, effectively filters noise generated by differential signals without using capacitors, resistors, or inductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive elements (capacitors, resistors, inductors) are used to form filters, then electromagnetic interference is reduced, but layout space is consumed and miniaturization is limited
Solution Approach 1:
The patent extracts and eliminates the passive elements (capacitors, resistors, inductors) from the filter structure, replacing them with a transmission line-based filtering mechanism. This removal of unnecessary components directly reduces layout space while maintaining EMI filtering functionality through the microstrip line configuration
Solution Approach 2:
The patent substitutes the conventional passive component-based filtering mechanism with a transmission line-based electromagnetic filtering mechanism. The microstrip lines and via holes create an alternative filtering path that eliminates the need for physical passive elements, thereby reducing space consumption
2Reliability
If passive elements are added to reduce EMI, then electromagnetic compatibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the filtering function with the existing transmission line structure. The microstrip lines and via holes that are already part of the signal path are configured to provide filtering action, combining the signal transmission and EMI filtering functions into a single integrated structure, thereby reducing overall device complexity
Solution Approach 2:
The transmission line structure serves multiple functions: it transmits the differential signal and simultaneously provides EMI filtering through its specific configuration. The via holes and microstrip lines perform both structural and filtering roles, eliminating the need for separate filtering components and reducing device complexity
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 solution reduces signal distortion, improves the quality of electronic devices, and promotes miniaturization by eliminating the need for passive components, thereby enhancing electromagnetic compatibility and reducing layout constraints.
Implementation Method 1
the impedances of the first microstrip line and the second microstrip line match the impedances of the first transmission line and the second transmission line, respectively
Implementation Method 2
the first microstrip line and the second microstrip line may filter the noise generated by the differential signal having the specific wavelength
Data Source
AI summary
A filter for filtering noise generated by a differential signal having a specific wavelength transmitted by a first transmission line and a second transmission line is disclosed. The filter includes a multi-layer substrate, a first microstrip line and a second microstrip line. The first and the second transmission lines and the first and the second microstrip lines are disposed at the multi-layer substrate. In addition, one end of the first microstrip line and one end of the second microstrip line are electrically connected to the first and the second transmission lines, respectively, by passing through the vias, and the other end is in a floating state. The impedances of the first and the second microstrip lines match the impedances of the first and the second transmission lines, respectively. Thus, the first and the second microstrip lines may filter the noise generated by the differential signal having the specific wavelength.