Multiple-Membrane Flexible Wall for Thermally-Compensated Microwave Resonators
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Solution Overview
Problem
Thermomechanical stresses and thermal gradients in flexible portions of microwave filters and multiplexers with thermally-compensated resonant cavities pose challenges, particularly at high temperatures and power levels, leading to reduced mechanical properties and increased weight due to the need for thermal resistance and deformability.
Innovation Solution
A multiple-membrane flexible wall system with thermally and mechanically coupled membranes, where each membrane is made of distinct materials like aluminium or bimetallic strips, assembled through methods like screw-fastening, banding, or brazing, to optimize thermal resistance and deformability, allowing for temperature-induced deformation while minimizing mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible wall is made more deformable to achieve temperature-induced deformation for compensation, then the deformability is improved, but the mechanical strength deteriorates due to increased thermomechanical stresses
Solution Approach 1:
The flexible wall is divided into multiple distinct flexible membranes (at least two) stacked together, where each membrane can deform independently to some extent. This segmentation allows the system to achieve greater overall deformability while distributing the mechanical stresses across multiple thinner layers, reducing the stress burden on each individual membrane and preventing material failure.
Solution Approach 2:
The system uses composite construction with multiple distinct flexible membranes that may be made of different materials. This composite approach combines the advantages of different materials to achieve both high deformability and adequate mechanical strength, where each layer contributes to the overall performance characteristics of the flexible wall assembly.
2Adaptability or versatility
If the flexible wall thickness is reduced to increase deformability, then the deformability is improved, but the thermal resistance deteriorates due to increased thermal gradients
Solution Approach 1:
Instead of using a single thick membrane, the system segments the flexible wall into multiple thinner membranes stacked together. This segmentation maintains low thermal resistance (by keeping individual membrane thicknesses low for high deformability) while the stacked configuration provides sufficient overall structural integrity and thermal management capability.
Solution Approach 2:
The solution transitions from a single-layer thick membrane to a multi-layer stacked configuration, adding the dimensional aspect of layering. This allows the system to achieve both high deformability (through thin individual layers) and adequate thermal resistance (through the stacked configuration providing cumulative thermal management).
3Adaptability or versatility
If the flexible wall is made more deformable to meet compensation requirements, then the deformability is improved, but the mechanical stresses increase beyond the elastic domain
Solution Approach 1:
The flexible wall is segmented into multiple distinct flexible membranes that share the deformation load. Each membrane deforms to a lesser extent than a single thick membrane would need to deform, keeping the mechanical stresses within the elastic domain of each individual membrane material while achieving the required overall deformation for temperature compensation.
4Temperature
If thicker walls are used to reduce thermal gradients, then the thermal resistance is improved, but the weight increases significantly
Solution Approach 1:
The system uses multiple thin membranes stacked together instead of a single thick wall. This segmentation achieves adequate thermal management (by providing cumulative thermal resistance through the stacked configuration) while keeping the weight low, as the total material volume is much less than a single thick wall would require.
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 reduces thermal gradients and mechanical stresses, enabling higher deformability and thermal resistance compatibility, thus expanding the field of use for OMUXs in high-power and hot environments without significant weight increase.
Implementation Method 1
said flexible membranes are thermally and mechanically coupled to the central region and to the peripheral region
Implementation Method 2
at least one of said flexible membranes comprises a bimetallic strip material, said bimetallic strip material participating in said temperature-induced deformation of the flexible wall
Data Source
AI summary
The present invention relates to a flexible cap system optimized for thermally-compensated technology microwave resonators. More specifically, this invention proposes a multiple-membrane flexible wall system for thermally-compensated filters and OMUX. The use of a multi-membrane flexible wall, in particular as sealing cap for a resonant cavity of an OMUX channel, makes it possible: to reduce the thermal resistance of the flexible wall, while maintaining an equivalent level of mechanical stresses exerted on said wall for a given displacement; or to reduce the mechanical stresses exerted on the flexible wall for a given displacement, while maintaining one and the same thermal resistance for said wall; or to increase the deformation of the flexible wall by maintaining an equivalent level of mechanical stresses and by maintaining an equivalent thermal resistance.