Radar Antenna Network With Frequency-Selective Isolation
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Solution Overview
Problem
Radar antenna systems for vehicles typically require multiple sensors with different characteristics, leading to a need for dense integration while maintaining high isolation between antennas, which is challenging due to cost and mounting position limitations.
Innovation Solution
A radar antenna system with a transmission line network that includes a guiding section, branching sections, filter sections, and additional filter sections, allowing for the compact integration of multiple antennas operating at different frequencies by selectively activating and isolating them using frequency-selective filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple radar antennas are densely integrated on a vehicle to reduce cost and mounting positions, then the number of sensors is reduced, but the isolation between individual antennas deteriorates
Solution Approach 1:
A transmission line network with frequency-selective filter sections is introduced as an intermediary between the guiding section and individual antennas. This network enables frequency-based signal routing and isolation, allowing multiple antennas to operate simultaneously with minimal interference despite dense physical integration.
Solution Approach 2:
The system utilizes frequency as a distinguishing parameter to differentiate and isolate signals from multiple antennas. By assigning different operating frequencies to different antennas and using frequency-selective filtering, the system maintains signal isolation without requiring large physical distances between antennas.
2Volume of moving object
If radar antennas are placed close together to reduce system size, then the minimum distance between antennas is reduced, but the isolation required for beamforming algorithms deteriorates
Solution Approach 1:
The transmission line network acts as an intermediary that compensates for the reduced physical distance between antennas by providing frequency-selective isolation. This allows the antenna system to maintain the required angular resolution for beamforming algorithms despite compact physical dimensions.
3Adaptability or versatility
If different radar antennas with different characteristics are used to perform multiple vehicle control functions, then the versatility of the system is improved, but the complexity of having multiple sensors increases
Solution Approach 1:
The transmission line network with its frequency-selective filter sections enables a single antenna system to perform multiple vehicle control functions by routing different frequency signals to different antenna elements. This multi-functional capability is achieved without requiring separate dedicated sensors for each function, thereby reducing overall system complexity.
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 the efficient integration of multiple radar antennas on a single board, enhancing isolation and flexibility in antenna field shaping, thereby supporting advanced vehicle control functions with reduced hardware requirements.
Implementation Method 1
The filter section is configured to block electromagnetic energy at a first frequency or within a first frequency band and to pass electromagnetic energy at a second frequency or within a second frequency band
Implementation Method 2
The additional filter section is configured to block electromagnetic energy at the first frequency or within the first frequency band and to pass electromagnetic energy at a further frequency or within a further frequency band
Implementation Method 3
The transmission line network has a guiding section, a branching section, an additional branching section, a filter section and an additional filter section
Data Source
AI summary
A radar antenna system comprises a first antenna, an additional first antenna, a second antenna, a guiding section, a branching section, an additional branching section, a filter section and an additional filter section. The branching section and the additional branching section are coupled in series in between the guiding section and the first antenna. The branching section couples the filter section to the guiding section and the additional branching section couples the additional filter section to the guiding section. The guiding section guides energy at a first, second and further frequency. The filter section couples the guiding section to the second antenna, blocks energy at the first frequency and passes energy at the second frequency. The additional filter section couples the guiding section to the second antenna or to a termination, blocks energy at the first frequency and passes energy at the further frequency.