Waveguide Block RF Seal for Tolerance-Tolerant Array Interfaces
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Solution Overview
Problem
Densely packed waveguide feed networks in antenna arrays face challenges due to large overall size and manufacturing difficulties, particularly in environments where space and weight are limited, such as avionics, and existing RF sealing methods may introduce imperfections that affect RF performance.
Innovation Solution
A contactless radio-frequency (RF) seal is implemented between waveguide blocks using channels and waveguide stubs to maintain a continuous waveguide signal path, reducing manufacturing tolerances and minimizing dielectric gaps, thereby ensuring effective RF sealing at the junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If waveguide blocks are joined using traditional RF sealing methods, then manufacturing precision can be improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The waveguide system is divided into separate waveguide blocks that can be manufactured independently and then joined together. Each block contains portions of waveguides, and the interface between blocks uses a contactless RF seal design that eliminates the need for complex traditional sealing mechanisms while maintaining RF performance.
Solution Approach 2:
The patent replaces traditional mechanical RF sealing methods (which would require precise mechanical contact, gaskets, or flanges) with a contactless RF seal approach. The RF seal is formed through the electromagnetic field interaction across the interface, eliminating complex mechanical sealing components and reducing manufacturing complexity.
2Reliability
If waveguide blocks are joined with tight tolerances to minimize dielectric gaps, then RF performance is improved, but manufacturing difficulty increases
Solution Approach 1:
The patent changes the approach from controlling the physical gap dimension (tight tolerances) to controlling the RF electrical characteristics at the interface. By designing the waveguide block interfaces and RF seals to achieve proper impedance matching and electromagnetic field continuity, the system achieves good RF performance without requiring tight mechanical tolerances or minimal dielectric gaps.
3Productivity
If the number of waveguides is increased to enhance antenna array performance, then communication capability is improved, but overall size and manufacturing complexity increase
Solution Approach 1:
The waveguide network is segmented into multiple modular waveguide blocks, each containing a manageable number of waveguides. This modular approach allows the overall system to support a large number of waveguides for enhanced antenna array performance while keeping each individual block's complexity manageable and facilitating easier manufacturing and assembly.
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 RF seal facilitates greater manufacturing tolerances and maintains effective RF performance, allowing for larger waveguide networks without significant impedance or reflection, even with manufacturing imperfections.
Implementation Method 1
a contactless radio-frequency (RF) seal is implemented between waveguide blocks using channels and waveguide stubs to maintain a continuous waveguide signal path
Implementation Method 2
A contactless radio-frequency (RF) seal is implemented between waveguide blocks using channels and waveguide stubs to maintain a continuous waveguide signal path, reducing manufacturing tolerances and minimizing dielectric gaps
Data Source
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AI summary
The described features include a scalable waveguide architecture for a waveguide device. The waveguide device may be split into one or more waveguide blocks instead of manufacturing increasingly larger single-piece waveguide devices. Described techniques provide for a radio-frequency (RF) seal between such waveguide blocks that may facilitate greater manufacturing tolerances while maintaining an effective RF seal at the junction of the waveguide blocks. The described techniques include channels within one or more waveguide blocks opening to the dielectric gap between the waveguide blocks. The channels may, for each of multiple waveguides joined at the interface between waveguide blocks, be included in one or both waveguide blocks and may be in a single waveguide dimension relative to the multiple waveguides, or extend for more than one waveguide dimensions.