Partially Metallized Horn Antenna for Low-Coupling Radar Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current automotive radar systems using horn antennas face issues with strong mutual coupling and degradation of radiation patterns due to mutual interference and ripples, particularly in H-plane sectoral horns, which are not adequately addressed by existing planar microstrip antennas.
Innovation Solution
A novel horn antenna design using partially metalized plastic structures, where the plastic is only partially coated with metal, allowing the dielectric properties of the plastic to influence the antenna performance, thereby reducing ripples and mutual coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If horn antennas are completely metalized to ensure stable radiation properties, then radiation stability is improved, but ripples appear in the radiation pattern due to diffraction by the finite size of metallization
Solution Approach 1:
The patent applies local quality by selectively metallizing only specific regions of the horn antenna structure. The metal coating is applied to the inner walls of the horn cavity to ensure stable radiation properties, while leaving the outer surface and aperture region unmetallized. This localized metallization approach maintains the beneficial radiation stability while eliminating the diffraction-induced ripples that occur with complete metalization.
2Area of stationary object
If multiple horn antennas are placed side by side to increase radar coverage, then antenna array coverage is improved, but strong mutual coupling occurs between adjacent antennas
Solution Approach 1:
The patent introduces plastic material as an intermediary substance between adjacent horn antennas in the array. This plastic material acts as a decoupling medium that reduces the strong mutual coupling between antennas while allowing the array to maintain expanded coverage. The dielectric properties of the plastic provide isolation between antenna elements without compromising the overall array performance.
3Ease of manufacture
If plastic material is completely covered with metal coating to form traditional horn antennas, then manufacturing simplicity is maintained, but the dielectric properties of plastic cannot be utilized to control antenna performance
Solution Approach 1:
The patent changes the metallization parameter from complete coverage to partial coverage, allowing the dielectric properties of the exposed plastic material to influence antenna performance. By controlling the extent and pattern of metal coating, the invention enables adjustment of radiation characteristics while maintaining the manufacturing simplicity of coating plastic components. This parameter change provides additional degrees of freedom for optimizing antenna performance.
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 design achieves a smooth radiation pattern with reduced ripples and mutual coupling, improving antenna performance and reducing the need for complex calibration, while maintaining wide bandwidth and ease of manufacturing.
Implementation Method 1
a cavity formed in the plastic body, wherein the cavity comprises a cavity opening formed at the top face of the plastic body; wherein the cavity is at least partially coated with a metal layer to form a horn antenna for radiating microwaves through the cavity opening
Implementation Method 2
the large metallic area at the antenna aperture generates the typical interference pattern in the electric field amplitude, due to the diffraction by the finite size of the metallization
Implementation Method 3
the dielectric properties of the plastic can affect now the antenna performance
Data Source
AI summary
A horn antenna device is disclosed that comprises: a plastic body comprising a top face, a bottom face opposing the top face and lateral faces adjoining the top face and the bottom face; and a cavity formed in the plastic body, wherein the cavity comprises a cavity opening formed at the top face of the plastic body, wherein the cavity is at least partially coated with a metal layer to form a horn antenna for radiating microwaves through the cavity opening, wherein the plastic body is partially coated with the metal layer, and wherein the metal layer being configured to define a radiation characteristic of the horn antenna.