Compressive RF Seal Gasket for Antenna Feed Hub
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Solution Overview
Problem
Existing reflector antennas face RF leakage issues due to joints between the feed and main reflector/antenna base, leading to signal degradation, and current sealing methods like conductive grease are cumbersome and inefficient, especially in exposed environments.
Innovation Solution
A compressible conductive and/or RF absorbent gasket arrangement is used to seal the joint between the feed hub and antenna base, eliminating the need for multiple seals and conductive grease, with the gasket being compressed to fit within the cavity formed by the vertex plate, feed hub, and antenna base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive seals and conductive grease are used to seal the joint, then RF leakage is reduced, but installation time and complexity increase
Solution Approach 1:
The patent combines multiple separate sealing components (conductive seals and conductive grease) into a single integrated gasket component. This gasket is pre-formed with conductive material embedded within it, eliminating the need for multiple separate sealing applications and reducing installation time while maintaining RF seal effectiveness.
Solution Approach 2:
The gasket is pre-formed and pre-positioned on the feed hub before final assembly. The conductive material is already embedded in the correct positions within the gasket structure, allowing for quick installation without requiring personnel to manually apply multiple seals and grease during the assembly process.
2Reliability
If conductive grease is applied to seal the joint, then RF leakage is reduced, but installation difficulty and safety requirements increase
Solution Approach 1:
The patent replaces the reusable but difficult-to-apply conductive grease with a disposable pre-formed gasket that has embedded conductive material. The gasket is installed as a complete unit and does not require manual application or skin protection measures, significantly improving installation ease while maintaining sealing effectiveness.
3Reliability
If multiple seals and conductive grease are used, then RF leakage is reduced, but manufacturing and inventory costs increase
Solution Approach 1:
The patent merges multiple separate sealing components into a single integrated gasket with embedded conductive material. This reduces the total number of parts that need to be manufactured, tracked, and inventoried, simplifying the supply chain while maintaining the same level of RF seal effectiveness.
4Ease of operation
If a single gasket is used to seal the joint, then installation is simplified, but sealing effectiveness may be compromised
Solution Approach 1:
The gasket is constructed as a composite material with conductive elements embedded within a compressible base material. This composite structure allows the single gasket to provide both the mechanical sealing function of traditional seals and the RF blocking function of conductive materials, ensuring sealing effectiveness is maintained while simplifying installation.
Solution Approach 2:
The gasket utilizes the compressibility parameter of the base material to achieve proper sealing contact when compressed between the feed hub and antenna base. This compression activates the embedded conductive material to make intimate contact with mating surfaces, ensuring effective RF sealing without requiring multiple separate components.
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 solution effectively seals the joint, improving electrical performance and reducing manufacturing, installation, and maintenance costs by simplifying the assembly process and eliminating the need for multiple seals and conductive grease.
Implementation Method 1
A compressible conductive and/or RF absorbent gasket arrangement is used to seal the joint between the feed hub and antenna base, with the gasket being compressed to fit within the cavity formed by the vertex plate, feed hub, and antenna base
Implementation Method 2
A first exemplary embodiment is demonstrated in FIGS. 1-5. As best shown in FIG. 1, the main reflector 3 is coupled to the antenna base 5. The antenna base 5 is adapted to receive a feed hub 7 supporting the feed waveguide 9 and subreflector 11, forming a joint 13 upon assembly
Implementation Method 3
A compressible conductive and/or RF absorbent gasket arrangement is used to seal the joint between the feed hub and antenna base
Data Source
AI summary
A reflector antenna feed RF seal between an antenna base, a feed hub and a vertex plate. The RF seal formed via a generally annular gasket of compressible material adapted to seat around an outer diameter of the feed hub. The gasket having an outer diameter greater than a diameter of a joint between the feed hub and the antenna base and less than an outer diameter of the vertex plate. The gasket compressed within a cavity formed between the antenna base, the feed hub and the vertex plate as the feed hub is seated within the antenna base.