Inaccessible RF Waveguide Fabrication Using High-Temperature Ceramic Dummy Loads
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Solution Overview
Problem
Conventional dip brazing techniques for RF microwave waveguide networks are unsuitable for inaccessible structures due to the inability of ferrite dummy loads to withstand high temperature treatments, leading to non-compact and bulky structures when alternative methods like crimping are used.
Innovation Solution
The method involves using high-temperature stable ceramic dummy load elements, such as silicon carbide, mounted within the waveguide structure before dip brazing, and a blocking assembly formed by a front cover and back block to seal the structure, allowing for the use of dip brazing to connect components while maintaining low voltage standing wave ratio and absorbing undesired RF energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dip brazing technique is used to connect waveguide components, then manufacturing ease and cost are improved, but ferrite dummy loads cannot withstand the high temperature treatment
Solution Approach 1:
The patent changes the material parameter of the dummy load from conventional ferrite to high-temperature stable ceramic material, enabling it to withstand the high temperature treatment required for dip brazing while maintaining its functional properties
Solution Approach 2:
The patent uses composite construction where the dummy load consists of a ceramic body with ferrite material, combining the high-temperature stability of ceramic with the RF absorbing properties of ferrite
2Reliability
If alternative joining methods like crimping are used instead of dip brazing, then dummy load stability is improved, but the structure becomes non-compact and bulky
Solution Approach 1:
By changing the material parameter to high-temperature stable ceramic, the dummy load can now withstand dip brazing temperatures, enabling the use of dip brazing which produces compact, smooth joints without the bulkiness associated with crimping or soldering methods
3Ease of manufacture
If dummy loads are mounted after dip brazing, then manufacturing process simplicity is improved, but inaccessible structures cannot be fabricated
Solution Approach 1:
The patent applies preliminary action by mounting the dummy loads before the dip brazing process, allowing them to be positioned in inaccessible locations that would otherwise require disassembly to access, while the high-temperature stable material ensures they survive the subsequent brazing operation
4Use of energy by moving object
If conventional ferrite dummy loads are used, then RF energy absorption is improved, but high temperature treatment capability deteriorates
Solution Approach 1:
The patent employs composite materials where the dummy load body is made of high-temperature stable ceramic material, while ferrite material is incorporated to maintain the RF energy absorbing properties, thus combining both required functionalities
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 approach enables the fabrication of compact and efficient inaccessible RF microwave waveguide structures that can withstand high temperature treatments, maintaining low voltage standing wave ratio and effective RF energy absorption.
Implementation Method 1
The molten flux serves a multi-purpose role: providing heat transfer, supporting the assembly, and fluxing the joints through a capillary action
Implementation Method 2
The molten flux serves a multi-purpose role: providing heat transfer, supporting the assembly, and fluxing the joints through a capillary action
Implementation Method 3
To absorb undesired RF microwave energy, ferrite termination parts, such as dummy loads, are used in the network
Data Source
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AI summary
A method for fabrication of an inaccessible RF microwave waveguide structure is provided. The method includes providing an RF microwave waveguide network including an array of waveguide components that have one or more apertures in a wall. The method also includes providing one or more dummy load elements made of a ceramic material having high-temperature stable properties. The dummy load elements are mounted in a predetermined place on the wall in the vicinity of the aperture. The method also includes providing a blocking assembly configured for covering RF microwave waveguide network. The blocking assembly is connected to the RF microwave waveguide network by using dip brazing.