Antenna-Diode Array for Automotive Radar Beam Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automotive radar modules installed in car bumpers and doors face challenges due to the thickness and curvature of plastic composites, which distort radar beams and require costly and time-consuming testing methods to ensure directional accuracy, especially for mid-range and long-range radars, and there is a need for a method to test both transmit and receive beam patterns efficiently in assembly line settings.
Innovation Solution
A two-dimensional array of antenna-diode pairs is used, where each antenna-diode pair can be individually biased to act as a mirror or detector, allowing for precise and quick adjustment of the radar beam pattern without mechanical parts, using a printed circuit board technology to address the curvature and thickness issues, enabling efficient testing of radar modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical translation of corner reflectors is used to test radar accuracy, then positioning accuracy can be established, but assembly line space is wasted and testing time increases
Solution Approach 1:
The patent replaces the mechanical translation system with an electronically controllable phased array radar system. The phased array can electronically steer beams and adjust scanning patterns without mechanical moving parts, thereby eliminating the need for large assembly line spaces and mechanical translation mechanisms while maintaining measurement precision through digital beam forming and signal processing.
Solution Approach 2:
The patent implements dynamic beam steering and scanning patterns through electronic control of the phased array. The radar can dynamically adjust beam directions, scanning speeds, and focal points to optimize testing efficiency and accuracy, allowing flexible adaptation to different testing requirements without mechanical reconfiguration.
2Reliability
If separate test equipment is used to test radar functionalities, then comprehensive testing can be performed, but assembly line space is wasted and testing cost increases
Solution Approach 1:
The patent designs the phased array radar system to perform multiple testing functions simultaneously - transmit beam pattern measurement, receive beam pattern measurement, angular accuracy verification, and multi-target detection - all through a single integrated system. This eliminates the need for separate specialized test equipment while maintaining comprehensive testing capability.
Solution Approach 2:
The patent combines multiple testing functions and equipment into a single integrated phased array system. The same array elements and signal processing infrastructure are used for both transmit and receive testing, merging what would traditionally require separate equipment into one unified testing platform.
3Measurement precision
If corner reflectors are positioned at 1 m distance to avoid diffraction effects, then measurement accuracy is maintained, but assembly line space requirements increase
Solution Approach 1:
The patent replaces physical corner reflectors at fixed distances with a phased array system that creates virtual targets through electronic beam forming. The system can simulate targets at any desired position and distance without requiring physical space, eliminating the 1-meter minimum distance constraint while maintaining angular measurement accuracy through digital signal processing.
Solution Approach 2:
The patent transitions from physical spatial positioning to electronic virtual positioning. Instead of requiring physical distance in three-dimensional space, the system uses phase shifting and signal processing to create virtual target positions, effectively adding an electronic dimension for target placement that is not constrained by physical space requirements.
4Adaptability or versatility
If plastic composites with high curvature are used in bumper corners, then radar installation flexibility is improved, but beam distortion increases
Solution Approach 1:
The patent replaces mechanical alignment and physical positioning methods with electronic beam steering and phase correction. The phased array can electronically compensate for distortions caused by curved plastic surfaces through adaptive beam forming and signal processing, maintaining beam pattern accuracy without requiring precise mechanical installation or flat mounting surfaces.
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 solution allows for rapid and precise testing of radar beam patterns and angular accuracy, reducing the need for separate test equipment, saving space, time, and cost, while enabling multi-target testing and compensating for beam skew, thus improving the assembly line efficiency and post-assembly radar maintenance.
Implementation Method 1
an antenna-diode pair array 100...detects an incident microwave signal or millimeter wave signal
Implementation Method 2
act as a mirror or detector...operate as a reflector that reflects the incident microwave signal or millimeter wave signal
Data Source
AI summary
A device for selectively reflecting an incident microwave signal or millimeter-wave signal includes multiple antennae disposed in an array. Each antenna has an input adapted to selectively receive a forward bias signal or a zero bias signal. The device also includes a diode disposed at each input of each antenna. The device also includes a switching device connected to each input, and configured to selectively apply a forward bias or zero bias to each of the diodes. In forward bias, each of the antennae detects the incident microwave signal or millimeter wave signal, and in zero bias, each of the antennae reflects the incident microwave signal or millimeter wave signal.