Stepped-Wall Horn Antennas for Satellite Spot Beams
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Solution Overview
Problem
Current satellite antenna technologies fail to generate high-gain spot beams with low mass, small volume, simple construction, and high reliability, particularly for electrically large, circularly symmetric applications.
Innovation Solution
Development of electrically large, profiled, high directivity, stepped-wall and smooth-wall horn antennas with spline-profiles using PCHIP splines to ensure monotonicity and optimize horn parameters for high directivity and low cross-polarization, enabling direct radiation of spot beams with apertures exceeding 10 wavelengths in diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional smooth-wall horns are used for multibeam applications, then compact size and low mass are achieved, but aperture efficiency and directivity are limited to less than 26 dBi
Solution Approach 1:
The horn antenna is divided into multiple stepped sections along its length, with each section having a different flare angle. This segmentation allows the antenna to achieve high aperture efficiency (up to 82%) and peak directivity exceeding 36 dBi while maintaining a compact form factor, resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent employs dynamic optimization of the stepped-wall profile using spline functions to determine optimal flare angles for each section. This dynamic approach maximizes aperture efficiency and directivity performance while controlling the overall structural complexity of the horn antenna
2Reliability
If electrically large aperture horns are designed for high directivity, then spot beam generation is enabled, but horn mass and volume increase significantly
Solution Approach 1:
The stepped-wall horn divides the aperture into multiple sections with progressively increasing flare angles, achieving electrically large aperture performance (exceeding 10 wavelengths in diameter) with high directivity (>36 dBi) while maintaining a compact physical structure that reduces mass compared to conventional smooth-wall horns of equivalent performance
Solution Approach 2:
The patent transitions from traditional two-dimensional horn profiles to a multi-dimensional stepped structure with optimized flare angles in different sections. This dimensional approach enables high directivity and spot beam capability while controlling mass by optimizing the three-dimensional geometry of each stepped section
3Ease of manufacture
If profiled smooth-wall horns are used for low-gain applications, then ease of manufacture is maintained, but cross-polarization levels increase
Solution Approach 1:
Different sections of the stepped-wall horn have locally optimized flare angles tailored to specific frequency bands and polarization requirements. This local optimization minimizes cross-polarization effects in each section while maintaining overall ease of manufacture through a systematic stepped structure that can be fabricated using standard techniques
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 antennas achieve high aperture efficiency, low cross-polarization, and high directivity, supporting multiple frequency bands and polarizations, while being more compact and cost-effective compared to conventional horns, with peak directivities exceeding 36 dBi and aperture efficiencies of up to 82%.
Implementation Method 1
direct-radiating horn antennas for use in satellite spot beam applications
Data Source
AI summary
Electrically large, stepped-wall or smooth-wall, direct-radiating horn antenna apparatus that may preferably be used in satellite spot beam applications. Exemplary electrically large smooth-wall horn antenna apparatus comprises one or more input ports, an electrically large output port, and a smooth-wall or stepped-wall tapered section having a spline-shaped profile extending from the input port(s) to the output port of the apparatus. The spline-shaped profile is preferably monotonic and is preferably configured to generate a spot beam. The spline-shaped profile may be configured to support multiple frequency bands, and dual simultaneous polarization having either linear or circular polarization. The spline-shaped profile is defined by spline knots, and, the knot radii form a nondecreasing sequence. Preferably, the spline-shaped profile comprises a piecewise cubic Hermite interpolating polynomial spline that interpolates the shape of curves between the spline knots.