Parallel-Plate Slot Array Antenna Layout for Fixed Beam Squint
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Solution Overview
Problem
Existing antenna designs for RADAR sensors often require mechanical rotation to align the beam, which is impractical or undesirable, and struggle with achieving a predetermined squint angle while balancing gain and side lobes.
Innovation Solution
The development of a waveguide-fed, parallel-plate slot array antenna structure with elongated radiating slots and protrusions, allowing for a predetermined beam squint angle without mechanical rotation, by optimizing the arrangement and positioning of radiating slots and protrusions to control the radiation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical rotation is used to align the antenna beam with a preferred direction, then the beam can be precisely oriented, but the device complexity increases and mechanical rotation becomes impractical or undesirable
Solution Approach 1:
The patent replaces the mechanical rotation system with an electromagnetic field-based solution. By strategically positioning radiating slots and protrusions within the waveguide structure, the antenna directly generates a squinted beam at the desired angle without any moving parts. This substitution of mechanical orientation with electromagnetic pattern control eliminates the complexity of rotation mechanisms while achieving precise beam alignment.
Solution Approach 2:
The patent changes the geometric parameters of the radiating elements (slots and protrusions) to control the radiation pattern. By adjusting the position, size, and distribution of these elements within the waveguide, the beam squint angle is directly controlled through electromagnetic parameter optimization rather than mechanical adjustment, resolving the contradiction between precision and complexity.
2Device complexity
If the antenna is designed with a predetermined squint angle, then mechanical rotation is eliminated, but achieving the desired squint angle while maintaining gain and minimizing side lobes becomes challenging
Solution Approach 1:
The patent applies local quality by creating non-uniform distribution of radiating elements within the waveguide. Different regions of the waveguide contain radiating slots and protrusions with specific geometric characteristics tailored to produce the desired squinted radiation pattern. This localized optimization of element properties enables precise control over the beam direction, gain, and side lobe levels simultaneously.
Solution Approach 2:
The patent employs asymmetric positioning and configuration of radiating slots and protrusions relative to the waveguide centerline. This asymmetric arrangement is deliberately designed to generate the squinted beam at the predetermined angle. The asymmetry in element distribution directly controls the radiation pattern to achieve the desired beam orientation while maintaining acceptable gain and side lobe characteristics.
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 enables efficient alignment of the antenna beam with a preferred direction, achieving a desired squint angle while minimizing grating lobes and maintaining antenna performance, particularly suitable for automotive RADAR sensors operating in the 76 GHz to 81 GHz frequency band.
Implementation Method 1
a feed waveguide comprising one or more feeding slots and a parallel plate waveguide operably coupled with the feed waveguide such that each of the one or more feeding slots of the feed waveguide is configured to inject electromagnetic energy into the parallel plate waveguide
Implementation Method 2
A plurality of radiating slots may be formed in an array and/or in a plurality of rows and/or columns extending away from the feed waveguide to deliver electromagnetic energy out of the antenna assembly
Data Source
AI summary
Antenna structures and assemblies for use in RADAR sensor assemblies and the like. In some embodiments, the assembly may comprise a feed waveguide comprising one or more feeding slots and a parallel plate waveguide operably coupled with the feed waveguide such that each of the one or more feeding slots of the feed waveguide is configured to inject electromagnetic energy into the parallel plate waveguide. A plurality of radiating slots may be formed in a plurality of rows and/or columns extending away from the feed waveguide to deliver electromagnetic energy out of the antenna assembly.