Low-Pass Filter Notch Structure for Shorter High Attenuation
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Solution Overview
Problem
Conventional low-pass filters face increased length and manufacturing costs due to the need for multiple inductor and capacitor members to enhance attenuation performance.
Innovation Solution
A low-pass filter device incorporating a metal pipe inside to form a notch, utilizing a configuration of metal and dielectric tubes to improve attenuation performance while reducing length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of inductor members and capacitor members is increased to improve attenuation performance, then the attenuation performance is improved, but the overall length of the low-pass filter increases
Solution Approach 1:
The patent places a metal pipe inside the dielectric tube, creating a nested structure where the metal pipe is positioned within the hollow interior of the dielectric tube. This nesting allows the metal pipe's inductive effect to be integrated within the existing dielectric tube structure, providing additional attenuation functionality without increasing the overall filter length.
Solution Approach 2:
The dielectric tube serves multiple functions: it provides dielectric insulation between the inner metal pipe and outer casing, and simultaneously acts as a structural housing for the metal pipe. The metal pipe contributes both inductive reactance for attenuation and structural support to the overall filter assembly, reducing the need for separate dedicated components.
2Reliability
If the number of inductor members and capacitor members is increased to improve attenuation performance, then the attenuation performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines the functions of multiple discrete inductor and capacitor members into a single integrated structure consisting of a metal pipe within a dielectric tube. This merging reduces the total number of separate components that need to be manufactured, assembled, and connected, thereby simplifying the manufacturing process and reducing labor and assembly costs.
Solution Approach 2:
The dielectric tube simultaneously provides insulation, structural support, and housing functions, eliminating the need for separate insulator and casing components. The metal pipe provides both inductive reactance and structural integrity, reducing the need for additional support structures and achieving improved attenuation with fewer total parts.
3Reliability
If the length of the low-pass filter is increased to accommodate more components, then the attenuation performance is improved, but the device occupies more space
Solution Approach 1:
The metal pipe is nested within the hollow interior of the dielectric tube, allowing the inductive element to occupy space that would otherwise be empty. This nested arrangement provides the inductive reactance needed for attenuation without increasing the external dimensions of the filter, effectively utilizing the internal volume of the dielectric tube.
Solution Approach 2:
The patent transitions from a linear arrangement of discrete components along the length of the filter to a concentric arrangement where the metal pipe is positioned radially within the dielectric tube. This dimensional change from linear to radial positioning allows the filter to achieve improved attenuation performance without increasing its longitudinal length or external footprint.
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 device achieves improved attenuation performance with a shorter length compared to conventional filters, resulting in cost reduction.
Implementation Method 1
the inductor member 3 forms an inductor in the circuit diagram
Implementation Method 2
the capacitor member 5 forms a capacitor in the circuit diagram
Data Source
AI summary
According to an embodiment of the present disclosure, provided is a low-pass filter device comprising: a first port disposed on one longitudinal side; a second port disposed on the other longitudinal side; a plurality of metal members disposed spaced apart from each other between the first port and the second port; a plurality of connecting members disposed between adjacent metal members among the plurality of metal members; a first dielectric tube disposed to surround at least one of the plurality of metal members; a metal pipe disposed to surround the first dielectric tube; and a second dielectric tube disposed to surround a metal member not surrounded by the first dielectric tube, among the plurality of metal members, and the metal pipe.