Monolithic Horn Antenna Feed Network for Low-Mass RF Integration
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Solution Overview
Problem
Existing horn antenna systems for satellites have high complexity, mass, and require complex manufacturing processes due to separate components that need alignment and RF interfacing, limiting their performance and applications, especially in weight-sensitive ESA systems.
Innovation Solution
Integrate horn antenna elements with feed networks using additive manufacturing to form a single monolithic workpiece, incorporating transmission zeros and multimode operations, allowing for compact and robust arrays with flexible rejection nulls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If horn antenna elements and feed networks are manufactured as separate components, then manufacturing flexibility and ease of repair are improved, but device complexity, mass, and assembly complexity increase
Solution Approach 1:
The patent merges the horn antenna element and feed network into a single monolithic structure manufactured via additive manufacturing. This integration eliminates multiple separate components, flanges, and RF interfaces, directly reducing assembly complexity while maintaining manufacturing capability through advanced additive processes.
Solution Approach 2:
The monolithic structure serves multiple functions simultaneously - the horn antenna element for radiation and the integrated feed network for signal distribution. This multi-functionality within a single component reduces the overall number of parts and simplifies the system architecture.
2Ease of repair
If horn antenna elements and feed networks are manufactured as separate components, then ease of repair is improved, but mass and assembly time increase
Solution Approach 1:
By combining the horn antenna and feed network into one monolithic piece, the patent eliminates the mass of multiple separate components, flanges, bolts, and alignment fixtures. The integrated structure reduces overall system mass while the additive manufacturing process enables cost-effective production.
3Ease of manufacture
If separate components are used with joints and discontinuities, then manufacturing ease is improved, but RF performance and reliability deteriorate
Solution Approach 1:
The monolithic integration eliminates all physical joints, flanges, and discontinuities between the horn antenna and feed network. This continuous structure removes potential sources of RF interference, mismatch, and failure, significantly improving reliability while additive manufacturing provides the manufacturing capability to achieve this integration.
4Ease of manufacture
If traditional manufacturing processes are used for separate components, then manufacturing capability is improved, but assembly precision and alignment difficulty worsen
Solution Approach 1:
By integrating the horn antenna and feed network into a single monolithic component, the patent eliminates alignment issues entirely. The features are precisely positioned relative to each other during the additive manufacturing process, achieving high precision without requiring post-manufacturing alignment procedures.
Data Source
AI summary
Provided herein are various enhancements for feed networks and aperture assemblies in radio frequency transmit/receive systems. In one example an apparatus includes a horn aperture integrated with a multimode feed network that can be monolithically fabricated in a single piece. The multimode feed network comprises a first feed section coupled between a first feed port and a first polarizer port of a polarizer and comprising a first waveguide filter and first waveguide stubs establishing first transmission zeros. The multimode feed network also includes a second feed section coupled between a second feed port and a second polarizer port of the polarizer and comprising a second waveguide filter and second waveguide stubs establishing second transmission zeros. The polarizer comprises a stepped septum positioned between the first polarizer port and the second polarizer port and having a shared port coupled to the horn aperture.