Polymer Foam RF Filter Housing with Conductive Coating
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Solution Overview
Problem
Radiofrequency filters made of aluminum are heavy, costly to manufacture, and suffer from thermal expansion issues that affect filtering frequency, while polymer alternatives face challenges with anisotropic thermal expansion and increased weight due to filler materials.
Innovation Solution
A radiofrequency filter body housing made from a polymeric composition comprising polymer foam and uniformly distributed filler material, coated with an electrically conductive material, which provides isotropic thermal expansion and reduced weight, addressing the issues of aluminum filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If aluminum is used for the filter body housing, then the filter has low cost and low thermal expansion, but the filter becomes heavy
Solution Approach 1:
The patent uses a composite material consisting of polymer foam matrix with distributed metallic particles or fibers. This composite provides a balance between weight reduction (lighter than solid aluminum) and maintaining structural properties (strength, thermal expansion characteristics) through the distributed metallic reinforcement, resolving the contradiction between weight and manufacturing cost/ease of manufacture
2Weight of moving object
If polymer foam is used for the filter body housing, then the filter becomes light-weight, but the filter exhibits anisotropic thermal expansion
Solution Approach 1:
The patent incorporates metallic particles or fibers distributed throughout the polymer foam matrix to create a composite material with more uniform thermal expansion characteristics. The metallic reinforcement compensates for the anisotropic nature of the foam structure, providing improved thermal stability while maintaining the light-weight advantage of the polymer base material
Solution Approach 2:
The patent creates local reinforcement zones within the polymer foam by distributing metallic particles or fibers throughout the matrix. This local quality approach addresses the anisotropic thermal expansion by providing localized structural support and thermal stability at critical points within the foam structure, maintaining overall composition stability
3Stability of the object's composition
If filler material is added to polymer composition, then the thermal expansion is reduced, but the weight increases
Solution Approach 1:
The patent optimizes the concentration, size, and distribution parameters of the metallic particles or fibers within the polymer foam matrix. By carefully controlling these parameters, the patent achieves sufficient thermal expansion control while minimizing the weight penalty associated with adding filler materials to the polymer composition
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 solution results in a lighter, cost-effective radiofrequency filter with stable filtering performance across temperature fluctuations, maintaining frequency accuracy and structural integrity.
Implementation Method 1
The filler material is uniformly distributed and randomly oriented throughout the polymeric composition... provides isotropic thermal expansion and reduced weight
Implementation Method 2
an electrically conductive material coating the polymeric composition
Data Source
AI summary
An apparatus 100 comprising a radiofrequency filter body housing 102. The radiofrequency filter body housing includes a polymeric composition 110 that includes at least one polymer foam 115 and filler material 120. The filler material is uniformly distributed and randomly oriented throughout the polymeric composition. The radiofrequency filter body housing also includes an electrically conductive material 125 coating the polymeric composition.