Microstrip Patch Antenna Layout for Wider Vehicle Radar Beam Width
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Solution Overview
Problem
Microstrip antennas used in vehicle radar devices suffer from narrow bandwidth and beam width limitations, which hinder accurate detection of objects around the vehicle, particularly for advanced autonomous driving functions like lane change assistance.
Innovation Solution
A microstrip antenna design incorporating a power supply line, radiating elements, parasitic patches with contoured shapes, and via holes that electrically connect to a ground plane, enhancing bandwidth and beam width through improved wave absorption and energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional microstrip antenna is used, then the structure is simple and manufacturing is easy, but the bandwidth and beam width are narrow
Solution Approach 1:
The antenna is divided into multiple radiating elements (first, second, third, and fourth radiating elements) arranged in a specific pattern. This segmentation allows each element to contribute to different aspects of the radiation pattern, thereby expanding the overall bandwidth and beam width while maintaining a relatively simple manufacturing process
Solution Approach 2:
The antenna design employs asymmetric arrangement of radiating elements and parasitic patches. The first and second radiating elements are positioned differently from the third and fourth radiating elements, creating an asymmetric structure that enhances bandwidth and beam width without significantly complicating the manufacturing process
2Device complexity
If a conventional microstrip antenna is used, then the structure is simple, but the beam width is narrow
Solution Approach 1:
The antenna design incorporates parasitic patches positioned at different spatial locations and orientations. These patches extend the radiation pattern in additional dimensions, effectively widening the beam width. The parasitic patches are strategically placed to create multiple radiation lobes, achieving broader coverage without proportionally increasing structural complexity
Solution Approach 2:
Parasitic patches are introduced as intermediary elements between the radiating elements and the ground plane. These patches mediate the electromagnetic field distribution, enhancing the radiation pattern and beam width. The parasitic patches couple with the radiating elements to create additional radiation paths, effectively widening the beam without requiring complex structural modifications
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 proposed design significantly widens the bandwidth and beam width, enabling more accurate object detection and improved performance for vehicle radar systems, particularly in blind spot detection and lane change functions.
Implementation Method 1
at least one via hole formed through the parasitic patch, the via hole being configured to electrically connect the parasitic patch to a ground plane of a dielectric substrate
Implementation Method 2
a parasitic patch spaced apart from an end of a radiating element of the plurality of radiating elements, wherein the parasitic patch has a contoured shape that at least partially surrounds the end of the radiating element
Data Source
AI summary
The present invention provides a microstrip patch antenna formed on a dielectric substrate comprising: a power supply line; a plurality of radiating elements arranged along the power supply line; a first parasitic patch spaced apart from a radiating element of the plurality of radiating elements; and at least one via hole formed through the first parasitic patch, the via hole being configured to electrically connect the first parasitic patch to a ground plane of the dielectric substrate.