3D Waveguide Power Divider With Septum Phase Compensation
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Solution Overview
Problem
Current radar antennas for autonomous vehicles face challenges in efficiently distributing and optimizing radar signal power for vertical polarization, leading to suboptimal sidelobe levels in far-field radiation patterns.
Innovation Solution
A three-dimensional waveguide antenna design with septum features and an impedance matching network that unevenly distributes radar signal power among multiple antenna elements, allowing for desired magnitude and phase relationships to minimize sidelobe levels, and can be manufactured using injection molding with metallic coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power is evenly distributed among antenna elements, then manufacturing and design are simplified, but sidelobe levels in far-field radiation patterns become suboptimal
Solution Approach 1:
The patent applies asymmetry by introducing an impedance matching network with different impedance values for different antenna elements. Specifically, the network provides different phase shifts and power distribution ratios to each element, creating an asymmetric power distribution pattern that optimizes the far-field radiation characteristics and minimizes sidelobe levels while maintaining manufacturing feasibility through a systematic design approach.
Solution Approach 2:
The patent changes the impedance parameters of the power distribution network by incorporating matching networks with specific impedance values (e.g., 50 ohms, 75 ohms, 100 ohms) for different antenna elements. These parameter changes enable precise control over power distribution ratios and phase relationships, allowing optimization of radiation patterns and sidelobe suppression without overly complicating the manufacturing process.
2Object-generated harmful factors
If complex impedance matching networks are used to optimize power distribution, then sidelobe levels are minimized, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing impedance matching networks only at specific antenna elements where phase and power adjustment are most critical for sidelobe suppression. Rather than complicating the entire power distribution system, the matching networks are strategically placed and designed with specific impedance values tailored to each element's position and radiation characteristics, optimizing performance while controlling overall complexity.
3Measurement precision
If vertical polarization is used for radar signals, then detection accuracy for autonomous vehicles is improved, but power distribution and phase control become more challenging
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-configuring the impedance matching networks with specific impedance values and topologies that are optimized for vertical polarization radar signals. The phase shifts and power distribution ratios are determined in advance based on the desired far-field radiation patterns for vertical polarization, eliminating the need for complex real-time adjustment mechanisms and simplifying the control system while maintaining detection accuracy.
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 design enhances the emission of vertically polarized radar signals with improved power distribution and phase relationships, reducing sidelobe levels and optimizing radar energy emission for autonomous vehicle applications.
Implementation Method 1
A three-dimensional waveguide antenna design with septum features and an impedance matching network that unevenly distributes radar signal power among multiple antenna elements
Implementation Method 2
A three-dimensional waveguide antenna design with septum features and an impedance matching network
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
Aspects of the disclosed technology provide solutions for splitting power between different parts of a waveguide. Features inside of a waveguide may include an input and interconnected vertical and horizontal hollow spaces (i.e. channels). Other features may include structures (i.e. septum features) that reflect a portion of electromagnetic energy moving in a channel and may allow another portion of that electromagnetic (EM) energy to pass around those septum features. A horizontal channel of a waveguide may lead to several vertical channel of the waveguide and the septum features may reflect EM energy toward one particular vertical channel such that an amount of EM energy output from that particular vertical channel may be increased as compared to amounts of EM energy output from other vertical channels of the waveguide. Geometries of the waveguide features may focus emitted EM energy by splitting the EM energy into several different parts.