Waveguide RF Assembly With Coupling Pin for Compact CubeSats
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Solution Overview
Problem
Small satellites, particularly CubeSats, face challenges in incorporating RF assemblies with sufficient amplification due to size constraints, making it difficult to ensure adequate RF signal power reaches electronics and processing circuits, especially at higher frequency bands like Ka-band.
Innovation Solution
A satellite system design featuring a conductive waveguide body with an RF cavity and a hermetically sealed RF circuit module housed within, including a signal coupling pin that extends into the RF cavity, allowing for efficient RF signal amplification and processing, even in compact spaces like the mast and reflector of CubeSats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna and reflector are reduced in size for higher frequency operations, then the satellite size is reduced, but the space available for amplifiers and RF components is insufficient
Solution Approach 1:
The RF circuit module is nested within the hollow interior of the mast structure, utilizing the existing mast volume for dual purposes: structural support and RF component housing. This nesting approach allows the amplifier and associated electronics to be accommodated within the mast without increasing the overall satellite footprint, effectively resolving the space constraint issue.
Solution Approach 2:
The mast structure serves multiple functions: it provides mechanical support for the reflector, acts as a structural element of the antenna system, and simultaneously houses the RF circuit module for signal amplification. This multi-functionality eliminates the need for separate dedicated spaces for structural and electronic components, addressing the volume vs. complexity contradiction.
2Volume of moving object
If amplifiers are incorporated close to the antenna for compact design, then component space is reduced, but the hermetic sealing and signal coupling become more difficult
Solution Approach 1:
A signal coupling pin protrudes from the RF circuit module through the mast wall into the RF cavity, serving as an intermediary element that transfers RF signals between the hermetically sealed amplifier and the antenna feed structure. This intermediary approach maintains the hermetic seal of the amplifier while enabling reliable signal coupling to the antenna system.
Solution Approach 2:
The hermetically sealed RF circuit module replaces traditional mechanical RF component assemblies, providing both protection against environmental contamination and a stable platform for signal coupling. The hermetic sealing ensures reliability of the amplifier electronics while the integrated signal coupling pin provides consistent electrical connection.
Data Source
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AI summary
A satellite system may include a reflector and a mast extending outwardly from the reflector. A radio frequency (RF) assembly may be carried by a distal end of the mast and include a conductive waveguide body having an RF cavity therein coupled with the reflector and a pin-receiving opening therein. An RF circuit module may include a housing carried by the conductive waveguide body, RF circuitry contained within the housing, and a signal coupling pin coupled to the RF circuitry and extending through the pin-receiving opening into the RF cavity.