Vehicular Radar Antenna Waveguide Isolation Against TX-RX Spillover
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Solution Overview
Problem
Conventional automotive radar systems face issues with mutual interference between transmitting and receiving antenna elements due to spill-over, leading to degraded performance and increased resource demands, with existing solutions either limiting detection range or increasing cost and space requirements.
Innovation Solution
A compact antenna design with metallic walls isolating transmitting and receiving elements on the same platform, using wave-guide ports and metallic walls to prevent spill-over, maintaining high-isolation and compactness without additional components or space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmitting and receiving antenna elements are placed on the same platform, then device complexity and space requirements are reduced, but mutual interference due to spill-over occurs leading to degraded performance
Solution Approach 1:
The antenna platform is segmented into distinct transmitting and receiving areas using metallic wall structures. These walls create physical partitions that separate the antenna elements into isolated groups, preventing spill-over interference while maintaining the integrated platform design. The segmentation allows both transmitting and receiving elements to coexist on the same platform without mutual interference.
Solution Approach 2:
Metallic wall structures serve as intermediary elements between transmitting and receiving antenna elements. These walls act as electromagnetic barriers that block the propagation of transmitted signals from reaching receiving elements, thereby eliminating spill-over interference. The intermediary structures enable co-location of transmitting and receiving elements while maintaining signal isolation.
2Reliability
If metallic wall structures are added to isolate transmitting and receiving areas, then spill-over interference is eliminated, but device complexity increases
Solution Approach 1:
The metallic wall structures are merged with the antenna platform design, forming an integrated structure where the walls are part of the overall antenna assembly rather than separate add-on components. This merging approach minimizes additional complexity by combining the isolation function with the existing platform structure, achieving signal isolation without proportionally increasing device 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
The design effectively eliminates spill-over interference, maintaining high-performance radar functionality while keeping the system compact and cost-effective.
Implementation Method 1
The antenna structure includes a transmitting wave-guide that guides transmitted radio signals from the at least one transmitter through the transmitting area to the transmitting port and a receiving wave-guide that guides received radio signals from the receiving port through the receiving area to the at least one receiver
Implementation Method 2
The wall structure, the first side of the antenna structure, and the first side of the PCB isolate radio frequency signals at the transmitting area from radio frequency signals at the receiving area
Data Source
AI summary
A vehicular radar sensing system includes a radar sensor disposed at a vehicle and having a printed circuit board (PCB). The radar sensor includes an antenna structure having a transmitting port for a transmitter of the radar sensor and a receiving port for a receiver of the radar sensor. The antenna structure includes a wall structure that extends from a first side of the antenna structure toward a first side of the PCB to at least partially define a transmitting area and a receiving area to isolate radio frequency signals at the transmitting area from radio frequency signals at the receiving area. The antenna structure includes a transmitting wave-guide that guides transmitted radio signals from the transmitter through the transmitting area to the transmitting port. The antenna structure includes a receiving wave-guide that guides received radio signals from the receiving port through the receiving area to the receiver.