Space-Borne Antenna RF Seal Assembly Gap Coupling
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Solution Overview
Problem
Space-borne antenna systems face challenges in internal calibration due to high amplitude ripple in transmit calibration mode, particularly for horizontal polarized signals, caused by signal coupling from waveguide radiators to choke flange assemblies between panels.
Innovation Solution
An RF seal assembly is introduced between panels, comprising L-shaped seal profiles that close the gap between panels without mechanical contact, made from materials matching the waveguides to minimize thermal stress and using adhesive tapes for attachment, which suppresses signal coupling to the choke flange assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If choke flange assemblies are used for contactless inter-panel signal transmission, then signal transmission across panel gaps is enabled, but signal coupling from waveguide radiators to choke flange assemblies causes high amplitude ripple in transmit calibration mode
Solution Approach 1:
An RF seal assembly is introduced as an intermediary element between the waveguide radiators and choke flange assemblies. This seal assembly comprises conductive material that blocks the electromagnetic coupling path, preventing signal leakage from radiators to choke flanges while maintaining the contactless gap structure for intended signal transmission
Solution Approach 2:
The RF seal assembly uses a thin conductive film or seal structure that spans the gap between panels. This thin film configuration effectively blocks electromagnetic fields causing coupling while maintaining mechanical flexibility and not interfering with the deployable panel structure
2Adaptability or versatility
If panels are made moveable for deployment and folding, then transportation and deployment flexibility is improved, but gap formation between panels requires complex choke flange assemblies
Solution Approach 1:
The RF seal assembly serves multiple functions simultaneously: it seals the gap between moveable panels, blocks unwanted electromagnetic coupling, and maintains the structural integrity of the deployable configuration. This multi-functional element simplifies the overall inter-panel connection system
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 assembly effectively reduces signal coupling, enabling more reliable internal calibration by minimizing mechanical force and maintaining panel latching functionality, verified through S-parameter tests.
Implementation Method 1
An RF seal assembly is introduced between panels, comprising L-shaped seal profiles that close the gap between panels without mechanical contact
Implementation Method 2
a first waveguide (31) in a housing of the first panel (10) and a second waveguide (32) in a housing of the second panel (20) and allowing a contactless inter-panel signal transmission
Data Source
Figure 1
Figure 2
AI summary
A space-borne antenna system (1) is described, comprising a number or panels (10, 20) being moveable to each other and having a gap (60) in between them when the panels (10, 20) are arranged in an operation condition; an RF distribution network for providing transmit signals to the number of panels (10, 20) and combining received signals from the number of panels (10, 20); and a set of choke flange assemblies (30) which allow a contactless inter-panel signal transmission across a dedicated gap, wherein a respective choke flange assembly is arranged on the far side of a radiating surface of the dedicated adjacent panels. Furthermore, the antenna system comprises an RF seal assembly (40) for suppressing a signal coupling of signals radiated from the number of panels (10, 20) to the set of choke flange assemblies (30) by sealing the gap (60).