Millimeter-wave Detect or Reflect Array for Automotive Radar Testing
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Solution Overview
Problem
Automotive radar modules installed in curved and thick plastic car parts face challenges in maintaining directional accuracy due to uncontrolled millimeter-wave lens effects, requiring a method to test and adjust transmit beam patterns efficiently and cost-effectively on assembly lines and in body shops.
Innovation Solution
A two-dimensional array of antenna-diode pairs that can be electronically biased to detect or reflect millimeter-wave signals, allowing for precise adjustment of the radar transmit beam pattern and angular accuracy without the need for mechanical corner reflectors, using a system that includes a computer-controlled switching device to manage the biasing of diodes and create programmable mirrors for testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical corner reflectors are used for testing radar accuracy, then measurement precision is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent replaces mechanical corner reflectors with an electronically controllable array of antenna elements that can be programmed to reflect radar signals. This electronic system substitutes the mechanical testing equipment, reducing physical complexity while maintaining measurement precision through digital control of element activation patterns.
Solution Approach 2:
The antenna array elements can be dynamically activated or deactivated electronically to create different reflection patterns. This dynamic control allows the same physical array to serve multiple testing functions, reducing the need for multiple static mechanical reflectors and decreasing overall device complexity.
2Measurement precision
If multiple test targets are positioned far apart to avoid diffraction effects, then measurement precision is improved, but productivity decreases due to increased space and time requirements
Solution Approach 1:
The electronic antenna array can rapidly reconfigure reflection patterns by changing which elements are activated, allowing multiple virtual test targets to be created and positioned anywhere within the array's coverage area. This dynamic reconfiguration enables sequential testing of multiple radar units in close proximity without requiring physical separation, thereby increasing assembly line throughput.
Solution Approach 2:
A single compact antenna array serves as a universal testing device that can create multiple virtual corner reflectors at different positions and orientations. This multi-functional capability eliminates the need for multiple physical test targets, reducing space requirements and enabling higher productivity while maintaining measurement precision.
3Measurement precision
If separate test equipment is used for different radar functionalities, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The antenna array is designed to perform multiple testing functions including measuring angular accuracy, beam width, and signal strength using the same physical infrastructure. By programmatically controlling different subsets of antenna elements, a single device replaces what would traditionally require multiple specialized test equipment, reducing overall system complexity while maintaining measurement precision.
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
Enables rapid and precise testing of radar beam patterns and angular accuracy, reducing space, time, and cost requirements in assembly lines and body shops, while allowing for efficient adjustment of radar systems to compensate for beam skew and curvature effects.
Implementation Method 1
each including an antenna and a diode coupled to the antenna. Each diode is configured to detect or reflect the incident millimeter-wave signal based on a bias applied to the diode
Implementation Method 2
Each antenna includes an input adapted to selectively receive a forward bias signal or a zero bias or a reverse bias signal to apply to each of the diodes
Data Source
AI summary
A device for detecting and selectively reflecting an incident microwave signal or millimeter-wave signal is disclosed. The device includes a plurality of antennae disposed in an array; and a diode disposed at each input of each antenna, each diode having an input adapted to selectively receive a reverse bias signal, or a zero bias signal, or a forward bias signal. The device also includes a switching device connected to each input, and configured to selectively apply the forward bias signal, or the reverse bias signal or the zero bias signal to each of the diodes. In forward bias, each of the plurality of antennae reflects the incident microwave signal or millimeter wave signal; and in zero bias or reverse bias each of the plurality of antennae detects the incident microwave signal or millimeter wave signal.