Offset Fed Dual Open Ended Waveguide Antenna Arrays
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Solution Overview
Problem
Existing automotive radar systems face challenges in achieving efficiency and cost-effectiveness while maintaining compact and easy manufacturing, particularly at 77 GHz frequencies, where energy loss is significant due to heating in substrate materials and complex manufacturing processes for all-metal designs.
Innovation Solution
A dual open-ended waveguide antenna system with a split block construction using two metal layers, where electromagnetic energy is fed from the bottom, allowing for easier power division and adjustment of amplitude and phase, reducing energy loss and simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an antenna is integrated into a circuit board (series-fed patch array), then it is inexpensive and easy to manufacture, but energy loss increases due to heating of the substrate
Solution Approach 1:
The antenna is divided into multiple radiating elements arranged in a linear array, each fed by a separate waveguide channel. This segmentation allows each element to be optimized for low loss while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
A waveguide structure serves as an intermediary between the feed network and the radiating elements. The waveguide channels guide electromagnetic energy with minimal substrate interaction, reducing heating losses while maintaining a compact, manufacturable design.
2Loss of energy
If all-metal antenna designs are used, then energy loss is minimized, but manufacturing difficulty increases for small geometries at 77 GHz
Solution Approach 1:
The antenna uses a composite structure combining metal waveguide channels with a substrate for mounting radiating elements. This composite approach achieves low energy loss through metal waveguides while maintaining ease of manufacture through standardized substrate technologies.
Solution Approach 2:
The waveguide channels are configured with specific height and length dimensions, with feeds coupled to opposite sides at offset positions. This dimensional configuration optimizes energy guidance while simplifying manufacturing at 77 GHz frequencies.
3Measurement precision
If tight beam focusing is achieved, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
Each radiating element in the linear array is configured with specific amplitude and phase characteristics to locally optimize beam formation. This allows tight beam focusing and high measurement accuracy while maintaining relatively simple individual element designs.
Solution Approach 2:
The antenna system enables dynamic beam steering and focusing by adjusting the amplitude and phase of signals fed to different radiating elements. This dynamic capability achieves high measurement accuracy without requiring complex mechanical structures.
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 provides a high-gain, low sidelobe level, and accurate beam pointing for radar systems, enhancing performance while maintaining a compact and cost-effective design, suitable for autonomous vehicle applications.
Implementation Method 1
A waveguide may be used to guide electromagnetic energy between each of the plurality of radiating elements and a waveguide feed
Implementation Method 2
The plurality of radiating elements may be arranged in a linear array and configured to radiate electromagnetic energy
Implementation Method 3
A power dividing network, defined by the waveguide, may be configured to divide the electromagnetic energy injected by the waveguide feed based on a taper profile
Data Source
AI summary
The radar system include a plurality of radiating elements arranged in a linear array configured to radiate electromagnetic energy. The radar system also includes a waveguide configured to guide electromagnetic energy between (i) each of the plurality of radiating elements and (ii) a waveguide feed. The radiating elements are coupled to a first side of the waveguide. The radar system additionally includes a waveguide feed configured to couple the electromagnetic energy between the waveguide and a component external to the waveguide. The waveguide feed is coupled to the second side of the waveguide at a position between two of the radiating elements. Further, the radar system includes a power dividing network defined by the waveguide and configured to divide the electromagnetic energy injected by the waveguide feed based on a taper profile.