Low-Pass Filter Impedance Segmentation for Transition Sharpness
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Solution Overview
Problem
Conventional filters face a trade-off where a sharper transition between the pass band and cut-off band leads to increased insertion loss, making it challenging to achieve both optimal signal attenuation and minimal insertion loss.
Innovation Solution
A low-pass filter design incorporating high-impedance and low-impedance transmission portions with specific geometric configurations, including meander parts and connection lines, to optimize signal transmission and minimize insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transition from pass band to cut-off band is made sharper, then signal attenuation performance is improved, but insertion loss increases
Solution Approach 1:
The filter is divided into multiple impedance portions (first high-impedance, first low-impedance, second high-impedance, second low-impedance transmission portions) that work together to achieve sharp transition while controlling insertion loss through distributed impedance transformation
Solution Approach 2:
The patent utilizes impedance parameter changes by alternating between high-impedance and low-impedance transmission portions, where each portion has specifically designed impedance characteristics to optimize the transition sharpness while minimizing overall insertion loss
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 filter achieves a balance between sharp transition and low insertion loss, ensuring effective signal attenuation with minimal power loss and improved return loss performance, as demonstrated by the graph showing favorable insertion and return loss characteristics.
Implementation Method 1
The high-impedance transmission portion is electrically connected to the input portion... The low-impedance transmission portion is electrically connected to the high-impedance transmission portion... for outputting the electromagnetic signals
Data Source
AI summary
A filter includes an input portion, a low-impedance transmission portion, a high-impedance transmission portion, and an output portion. The input portion receives electromagnetic signals. The high-impedance transmission portion is electrically connected to the input portion, and includes a first high-impedance transmission portion, a second high-impedance transmission portion, a third high-impedance transmission portion, a first connection portion, and a second connection portion. The low-impedance transmission portion is electrically connected to the second high-impedance transmission portion, and includes a pair of protrusion portions. The output portion is electrically connected to the third high-impedance transmission portion, for outputting the electromagnetic signals therefrom. The first connection portion electrically connects the first high-impedance transmission portion to the second high-impedance transmission portion. The second connection portion electrically connects the second high-impedance transmission portion to the third high-impedance transmission portion.