Segmented Radar Antenna Ground Layout for Wider Beamwidth
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Solution Overview
Problem
Conventional vehicle radar antennas suffer from mutual interference of electromagnetic waves between emitting and receiving modules, leading to reduced detection accuracy and beamwidth, and are prone to edge effects due to electromagnetic wave interference with surrounding electronic components.
Innovation Solution
The antenna design includes a substrate with two metal grounds separated by gaps, featuring radiating elements that emit electromagnetic waves in both X-axis and Y-axis directions, reducing interference and enhancing beamwidth and detection range, while preventing electromagnetic wave interference with electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If radiating elements emit electromagnetic waves in both X-axis and Y-axis directions to increase beamwidth, then detection range is improved, but mutual interference between emitting and receiving modules increases
Solution Approach 1:
The antenna structure is divided into separate emitting ends and receiving modules with distinct metal ground regions. Each module operates independently with its own ground plane, allowing wide beamwidth radiation while minimizing mutual interference through spatial and electrical separation.
Solution Approach 2:
The harmful electromagnetic waves causing mutual interference are extracted and directed away from sensitive receiving modules through strategic placement of metal grounds and gaps. The receiving modules are positioned to receive desired wide-beam signals while being shielded from interfering emissions.
2Area of stationary object
If metal grounds are extended to cover larger area to improve radiation performance, then beamwidth increases, but edge effects from interference with surrounding electronic components increase
Solution Approach 1:
Gaps are introduced as intermediary spaces between the metal grounds and surrounding electronic components. These gaps act as electromagnetic barriers that prevent edge effects and interference while allowing the metal grounds to maintain sufficient area for optimal radiation performance.
Solution Approach 2:
The metal ground structure is segmented into discrete regions separated by gaps, preventing continuous electromagnetic coupling with surrounding components. This segmentation maintains the beneficial large-area radiation characteristics while eliminating harmful edge effects.
3Measurement precision
If gaps are introduced between metal grounds to reduce mutual interference, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The antenna employs a segmented metal ground structure with gaps between emitting and receiving regions. This segmentation naturally reduces mutual interference and improves detection accuracy while maintaining manufacturing simplicity through straightforward PCB fabrication 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
This design improves the accuracy of determining object direction by reducing mutual interference and edge effects, increasing beamwidth and detection range, and ensuring symmetrical and stable radiation fields.
Implementation Method 1
the radiating elements of the emitting end are in a strip shape and disposed at intervals on first sides and second sides of the transmission line of the emitting end along the Y-axis direction
Implementation Method 2
The second metal ground is completely separated from the first metal ground by a first gap, which effectively decreases the electromagnetic wave across the first gap to solve mutual interference of the electromagnetic waves between the emitting end and the receiving module
Implementation Method 3
the polarization direction (i.e., the current direction) of the antenna has both the X-axis direction component and the Y-axis direction component, so the radiation fields on the XZ plane and the YZ plane are generated
Data Source
AI summary
An antenna for improving an influence of surface waves and increasing a beamwidth includes: a substrate, a first metal ground, a second metal ground, an emitting end and a receiving module. The first metal ground and the second metal ground are disposed on a first surface of the substrate. The second metal ground is completely separated from the first metal ground by a first gap. The emitting end is disposed on the first metal ground and includes a transmission line and a plurality of radiating elements. The receiving module is disposed on the second metal ground and includes a first receiving end and a second receiving end. The first receiving end includes a transmission line and a plurality of radiating elements. The second receiving end includes a transmission line and a plurality of radiating elements.