Split-Block MIMO SAR Radar Antenna Waveguide Architecture
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Solution Overview
Problem
Existing automotive radar systems face challenges in balancing efficiency with cost-effective manufacturing, particularly at 77 GHz frequencies, where energy loss to heating in substrate materials is significant, and all-metal designs are difficult to manufacture in small geometries.
Innovation Solution
The development of a split-block antenna assembly with dual open-ended waveguide antennas arranged in multiple-input multiple-output (MIMO) and synthetic aperture radar (SAR) configurations, utilizing a three-dimensional or two-dimensional waveguide dividing network to achieve efficient power division and beamforming without absorption components, enabling compact and efficient radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If series-fed patch array antennas are integrated into circuit board for cheap and easy manufacture, then manufacturing cost and ease are improved, but energy efficiency deteriorates due to significant energy loss heating the substrate
Solution Approach 1:
The patent replaces the traditional series-fed patch array antenna structure integrated into circuit board with a waveguide-based antenna system. The waveguide structure uses hollow metallic channels to guide electromagnetic waves, eliminating the need for substrate integration and series feeding networks. This substitution of the fundamental antenna architecture achieves superior energy efficiency by preventing substrate heating while maintaining manufacturability through modular waveguide assembly.
Solution Approach 2:
The patent extracts the antenna elements from the circuit board substrate and implements them as separate waveguide structures. By taking out the radiating elements from the lossy substrate environment and placing them in free-space or low-loss support structures, the design eliminates the primary source of energy loss (substrate heating) while preserving the antenna array configuration for cost-effective manufacturing.
2Loss of energy
If all-metal antenna designs are used to minimize energy loss, then energy efficiency is improved, but manufacturing difficulty increases due to small geometries required for 77 GHz operation
Solution Approach 1:
The patent divides the antenna system into segmented waveguide modules, each handling specific frequency ranges or beam directions. For 77 GHz operation, the waveguide structure is segmented into manageable sections with standardized connectors and interfaces. This segmentation allows each module to be manufactured independently with relaxed tolerances, then assembled into the complete antenna array, significantly easing manufacturing while maintaining the all-metal low-loss construction.
Solution Approach 2:
The patent employs nested waveguide structures where smaller waveguide sections are inserted into larger housing structures or mounting brackets. The waveguide elements with precise small geometries for 77 GHz operation are nested within larger, easier-to-manufacture support structures, combining the precision requirements only where absolutely necessary while simplifying overall manufacturing through hierarchical assembly.
3Measurement precision
If directional antennas are used to focus radiated energy for high accuracy measurement, then measurement precision is improved, but device complexity increases due to multiple antenna arrays required for MIMO and SAR configurations
Solution Approach 1:
The patent designs the waveguide antenna elements to serve multiple functions simultaneously. Each waveguide module can operate in different modes (MIMO transmission, SAR transmission, SAR reception) by reconfiguring the signal input/output ports. This multi-functionality allows a single physical antenna structure to replace what would traditionally require multiple separate antenna arrays, reducing device complexity while maintaining high measurement precision through focused directional beams.
Solution Approach 2:
The patent implements dynamic beamforming capabilities through electronic phase shifters and signal processors connected to the waveguide antenna arrays. By dynamically adjusting the phase and amplitude of signals fed to each antenna element, the system can electronically steer and focus beams in different directions without physically moving the antennas. This dynamic control enables high measurement precision for multiple targets and functions while avoiding the complexity of multiple fixed physical antenna structures.
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 configuration allows for high-gain, narrow-beam antennas with improved efficiency and accuracy in 3D data capture, enhancing the radar system's ability to identify objects like bridges and vehicles, while maintaining cost-effectiveness and ease of manufacturing.
Implementation Method 1
The radar system includes a set of waveguides in the split-block assembly configured to couple each array to a port
Implementation Method 2
Radio detection and ranging (RADAR) systems can be used to actively estimate distances to environmental features by emitting radio signals and detecting returning reflected signals
Implementation Method 3
Some systems may also estimate relative motion of reflective objects based on Doppler frequency shifts in the received reflected signals
Data Source
AI summary
A radar system includes a split-block assembly unit comprising a first portion and second portion, where the first portion and the second portion form a seam. The radar system further includes a plurality of ports located on a bottom side of the second portion opposite the seam. Additionally, the radar system includes a plurality of radiating elements located on a top side of the first portion opposite the seam. The plurality of radiating elements is arranged in a plurality of arrays. The plurality of arrays includes a set of multiple-input multiple-output (MIMO) transmission arrays, a set of synthetic aperture radar (SAR) transmission arrays, and at least one reception array. Further, the radar system includes a set of waveguides configured to couple each array to a port.