3D Array Antenna Backlobe Suppression for Automotive Radar
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Solution Overview
Problem
Current automotive radar systems require significant space and incur high costs due to the need for multiple separate radar systems with RF transparent materials, leading to inefficiencies in packaging, assembly, and mounting.
Innovation Solution
A compact three-dimensional integrated array antenna is developed using a multilayer design with microstrip patches, a ground plane with a slot, and a microstrip feeding line, along with a backlobe suppression reflector to reduce crosstalk and enhance performance, fabricated on a low-cost substrate like liquid crystal polymer (LCP).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate radar systems are used for long range and short range detection, then detection coverage is improved, but space requirement and cost increase
Solution Approach 1:
The patent combines multiple radar functions (long range and short range detection) into a single integrated antenna system. The array antenna structure integrates multiple radiating elements that can perform both long-range and short-range detection functions simultaneously, eliminating the need for separate radar systems and reducing overall space requirements.
Solution Approach 2:
The array antenna is designed with multi-functionality to perform both long-range and short-range detection tasks. By configuring the antenna elements and signal processing appropriately, the same physical antenna system can serve multiple detection purposes, making it a universal solution that replaces multiple specialized systems.
2Reliability
If multiple separate radar systems are mounted on the vehicle, then detection redundancy is improved, but packaging and assembly cost increases
Solution Approach 1:
The patent merges multiple radar detection functions into a single antenna assembly, reducing the number of separate units that need to be packaged and assembled. This integration simplifies the manufacturing process and reduces assembly costs while maintaining detection redundancy through the array structure's inherent capabilities.
3Reliability
If RF transparent materials are placed on top of each radar system, then radar performance is improved, but material cost increases
Solution Approach 1:
By integrating multiple radar functions into a single antenna system, the patent reduces the total quantity of RF transparent materials needed. Instead of placing materials on multiple separate radar systems, only one integrated system requires such materials, thereby reducing material costs while maintaining radar performance.
4Volume of moving object
If a compact three-dimensional integrated array antenna is used, then space efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs a three-dimensional array antenna structure that utilizes vertical stacking of antenna elements in addition to horizontal arrangement. This 3D configuration achieves compactness by exploiting the third dimension (height/depth), allowing multiple elements to be packed into a smaller overall volume while managing manufacturing complexity through systematic element arrangement.
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 achieves improved bandwidth, gain, and reduced backside radiation, resulting in a more compact and cost-effective radar system with enhanced aperture efficiency, reducing material and packaging costs while maintaining effective performance for mm-wave automotive applications.
Implementation Method 1
a microstrip feeding line for propagating signals through the slot in the ground plane and to the second microstrip patch
Implementation Method 2
a backlobe suppression reflector for receiving some of the signals and reflecting the signals to the slot in the ground plane
Data Source
AI summary
A multilayer antenna including a first microstrip patch positioned along a first plane, a second microstrip patch positioned along a second plane that is substantially parallel to the first plane, and a ground plane having a slot formed therein. The multilayer antenna also includes a microstrip feeding line for propagating signals through the slot in the ground plane and to the second microstrip patch and a backlobe suppression reflector for receiving some of the signals and reflecting the signals to the slot in the ground plane.