Dual Frequency Feed Assembly with Modular OMT and Waterproofing
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Solution Overview
Problem
Existing dual frequency feed assemblies for satellites are complex, difficult to mass-produce, and prone to signal distortion and attenuation due to waterproofing issues, particularly when designed for both Ka-band and Ku-band frequencies and polarizations.
Innovation Solution
A dual frequency feed assembly with a core unit and detachable branch waveguides, featuring built-in polarizers and O-rings for waterproofing, allowing for easier assembly and mass production through die-casting molding, and incorporating filters to reduce noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dual frequency feed assembly structure is used, then signal separation between Ka-band and Ku-band is achieved, but the structure becomes complex and difficult to mass-produce
Solution Approach 1:
The feed assembly is divided into separate modular components: a feedhorn assembly and a dual-frequency OMT assembly. Each module can be independently manufactured and tested, then assembled together. This segmentation simplifies the manufacturing process for each individual component while maintaining the overall signal separation functionality.
Solution Approach 2:
The inner waveguide is nested within the outer waveguide in a concentric configuration. The branch waveguides are integrated into the OMT structure with cutting surfaces that interface with the core unit. This nested design allows compact arrangement of multiple waveguides while maintaining clear separation of Ka-band and Ku-band signal paths.
2Reliability
If conventional feed structures are used, then signal separation is achieved, but mass production becomes difficult due to assembly complexity
Solution Approach 1:
The feed assembly is divided into separate modular components: a feedhorn assembly and a dual-frequency OMT assembly. Each module can be independently manufactured and tested, then assembled together. This segmentation simplifies the manufacturing process for each individual component while maintaining the overall signal separation functionality.
Solution Approach 2:
The design incorporates standardized parameters and dimensions that facilitate die-casting molding and other mass production techniques. The modular architecture with defined interfaces allows for automated assembly processes, significantly improving productivity for large-scale deployment.
3Adaptability or versatility
If conventional feed designs are used, then linear polarization is supported, but circular polarization capability is not provided
Solution Approach 1:
The OMT structure is designed to handle both linear and circular polarizations through its symmetric geometry and waveguide configuration. The concentric waveguide arrangement and branch waveguide design allow the same structure to process different polarization types without requiring separate dedicated paths, achieving multi-functionality.
Data Source
AI summary
The invention discloses a dual frequency feed assembly for receiving signals of both a first band and a second band lower than the first band, or transmitting signals of one of the first band and the second band while receiving signals of the other band. The dual frequency feed assembly includes an orthogonal-mode transducer, which includes: a core unit having an inner waveguide, an outer waveguide with a diameter larger than that of the inner waveguide and the two waveguides being concentric, a first band output/input port connected to the inner waveguide, and a second band output/input port; and two or four detachable branch waveguides connected to the core unit. An O-ring is provided at each connection between the core unit and the branch waveguides. The dual frequency feed assembly further comprises a first band polarizer made of a metal septum and/or a second band polarizer made of dielectric slabs, when receiving circularly polarized signals. Both of them can be provided in the inner waveguide or the outer waveguide, respectively, which makes the feed assembly design more compact and suitable for mass production.