Single-Layer Radar Antenna Feed Layout for Wide Bandwidth
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Solution Overview
Problem
Conventional multilayer parallel-fed antenna arrays for automotive radars face high processing difficulty and costs due to their complex structure, which affects bandwidth and pattern integrity, especially in high-frequency scenarios.
Innovation Solution
A single-layer microstrip antenna design with feed lines angled between 20 to 70 degrees relative to the current direction of radiating elements, reducing radiation interference and allowing feed network and radiating elements to be on the same layer, thereby minimizing material and processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multilayer parallel-fed antenna array structure is used, then the antenna achieves wide bandwidth and parallel feeding capability, but the processing difficulty and manufacturing costs increase significantly
Solution Approach 1:
The patent merges the feed network and radiating elements onto the same substrate layer, eliminating the need for multiple layers. The feed lines are designed with specific angular orientations (20-70 degrees) relative to the radiating elements, allowing both feeding and radiation functions to coexist on a single layer, thus reducing manufacturing complexity while maintaining wide bandwidth capability
Solution Approach 2:
The patent changes the geometric parameter of the feed lines by introducing specific angular orientations (20-70 degrees) between the feed line segments and the radiating elements. This parameter optimization reduces mutual interference between feed lines and radiating elements, enabling single-layer implementation while preserving the wide bandwidth performance typically achieved only with multilayer structures
2Device complexity
If feed lines are arranged parallel to the current direction of radiating elements, then the feed network is simplified, but the radiation interference and cross-polarization impact increase
Solution Approach 1:
The patent introduces asymmetric angular orientations (20-70 degrees) between the feed line segments and the radiating elements, breaking the symmetry that would otherwise cause strong coupling and cross-polarization interference. This asymmetric arrangement reduces the harmful radiation effects while maintaining feed network functionality
Solution Approach 2:
The patent optimizes the angular parameter of the feed lines, specifically setting the angle between feed line segments and radiating elements to be between 20-70 degrees. This parameter change minimizes the radiation interference and cross-polarization impact that would occur with parallel alignment, while still maintaining a relatively simple feed network 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
This design reduces processing complexity and costs while maintaining antenna performance, particularly in high-frequency bands, by counteracting radiant energy and minimizing cross- and co-polarization impacts, thus enhancing antenna pattern integrity and bandwidth.
Implementation Method 1
phases of feed line segments of a half-wavelength (one half of the dielectric wavelength) or close to the half-wavelength are opposite in a far field, so that some radiant energy counteracts each other
Data Source
AI summary
Embodiments of this application disclose an antenna. The antenna may be applied to the field of automatic driving and the field of vehicle-to-everything, and the antenna includes a first radiating element and a first feed line. A first end of the first feed line is connected to the first radiating element. The first radiating element and the first feed line are arranged on a same surface of a dielectric substrate. The first feed line includes a first feed line segment, and an acute angle between the first feed line segment and a current direction of the first radiating element is greater than or equal to 20 degrees, and is less than or equal to 70 degrees. A feeding manner of the antenna is parallel feeding.