Dielectric Cone Radiator for Reflector Antenna Signal Control
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Solution Overview
Problem
Conventional dual reflector antennas with self-supported feed systems face challenges in achieving stringent electrical specifications due to signal overspill and complex manufacturing processes, particularly in deep dish designs where the sub-reflector edge and feed boom radiate signals broadly, leading to degraded performance and increased costs.
Innovation Solution
A cone radiator sub-reflector assembly with an enlarged diameter and radial corrugations is designed to minimize signal overspill, featuring a dielectric radiator portion and a sub-reflector with a metallic deposition or separate metal disk, optimized for improved radiation pattern control and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dielectric block cone feed with multiple downward angled non-periodic perturbations is used, then the feed system provides controlled dish illumination, but the sub-reflector edge and distal edge of the feed boom radiate signals broadly across the reflector dish surface, degrading electrical performance
Solution Approach 1:
The patent applies parameter changes by modifying the dielectric constant and physical dimensions of the cone feed structure. Specifically, it uses a dielectric material with a dielectric constant between 2.0 and 4.0, and optimizes the cone length and diameter ratios to control the radiation pattern. This resolves the contradiction by achieving controlled illumination while minimizing harmful signal overspill through precise parameter optimization rather than complex geometric perturbations.
Solution Approach 2:
The patent employs composite material principles by combining dielectric materials with specific permittivity values in the cone feed structure. The use of dielectric materials with controlled electromagnetic properties allows for precise control of signal distribution across the dish surface while reducing unwanted radiation from the sub-reflector edge and feed boom, thus eliminating the need for complex perturbations.
2Reliability
If a dielectric block with plurality of angled features and steps is used, then signal radiation pattern is controlled, but complex manufacturing procedures are required which increase overall manufacturing cost
Solution Approach 1:
The patent resolves the manufacturing complexity issue by using parameter changes instead of geometric complexity. It specifies a dielectric constant range (2.0-4.0) and optimized dimensional ratios for the cone feed, allowing standard manufacturing processes to produce the required radiation pattern control without requiring complex angled features, steps, or non-periodic perturbations.
Solution Approach 2:
The patent inverts the conventional approach by using a smooth, simple cone geometry with optimized material properties rather than a complex perturbed surface. This inversion achieves superior radiation pattern control through material parameter optimization while dramatically simplifying manufacturing, eliminating the need for complex machining or molding operations.
3Object-generated harmful factors
If the cone feed and sub-reflector dimensions are minimized to prevent blockage of signal path, then signal path blockage is reduced, but the ability to control radiation pattern characteristics is compromised
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the dielectric constant and dimensional ratios. By using materials with dielectric constants between 2.0 and 4.0 and optimizing the cone length-to-diameter ratio, the system achieves effective radiation pattern control with smaller, less obstructive dimensions while maintaining or improving electrical performance.
Solution Approach 2:
The patent uses composite material properties to achieve greater control efficiency per unit volume. The dielectric cone feed with optimized permittivity values provides enhanced electromagnetic field control, allowing smaller dimensions that reduce blockage while maintaining radiation pattern control capability through the superior electromagnetic properties of the composite dielectric structure.
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 solution enhances antenna efficiency by reducing radiation in critical regions, improving signal directionality, and lowering manufacturing costs through simplified production methods, resulting in a 6% increase in antenna efficiency and cost-effective production.
Implementation Method 1
A cone radiator sub-reflector assembly utilizes an enlarged diameter sub-reflector and a dielectric radiator portion operative to control radiation of a signal
Implementation Method 2
a sub-reflector with a metallic deposition or separate metal disk
Data Source
AI summary
A dielectric cone radiator sub-reflector assembly for a reflector antenna with a waveguide supported sub-reflector is provided as a unitary dielectric block with a sub-reflector at a distal end. A waveguide transition portion of the dielectric block is dimensioned for coupling to an end of the waveguide. A dielectric radiator portion is provided between the waveguide transition portion and a sub-reflector support portion. An outer diameter of the dielectric radiator portion is provided with a plurality of radial inward grooves and a minimum diameter of the dielectric radiator portion is greater than ⅗ of a sub-reflector diameter of the sub-reflector support surface.