Vivaldi Antenna Wings for Vehicle Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RF antenna systems in vehicle detection systems suffer from interference and unintended activation due to undesirable signal emission towards the rear and sides, leading to incorrect triggering of the authentication process for opening vehicle doors or liftgates.
Innovation Solution
The implementation of Vivaldi antennas with extensions or 'wings' that improve the focus and emission power of the RF beam, redistributing energy to reduce rear and side signal emission while enhancing the forward-facing signal, thereby minimizing interference and incorrect triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF antenna designs are used in vehicle detection systems, then the system can detect motion, but the antenna emits signal in undesirable directions (rear and sides) causing interference and unintended activation
Solution Approach 1:
The patent applies asymmetry by designing the Vivaldi antenna with unequal extension portions - a first extension portion extending in a first direction and a second extension portion extending in a second direction perpendicular to the first. This asymmetric geometry redirects the RF beam pattern to eliminate rear and side lobes while concentrating energy in the forward detection direction, thereby reducing harmful emissions without compromising detection reliability
Solution Approach 2:
The patent utilizes dimensional change by extending the antenna structure in multiple directions (first direction and second direction perpendicular thereto) rather than a single linear extension. This two-dimensional extension pattern transforms the traditional one-dimensional Vivaldi antenna into a planar structure that shapes the RF beam in multiple spatial dimensions, effectively suppressing unwanted radiation in rear and side directions while maintaining forward detection capability
2Object-generated harmful factors
If additional absorber material is implemented to reduce rear and side signal, then interference is reduced, but cost and manufacturing complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the need for separate absorber materials by integrating the beam-shaping function directly into the antenna structure itself. The extension portions of the Vivaldi antenna inherently redirect the RF beam pattern through its geometry, removing the requirement for additional defensive components and thereby reducing both material cost and manufacturing complexity while still achieving the goal of reducing rear and side signal emission
Solution Approach 2:
The antenna structure serves itself by using its own geometric configuration (the extension portions) to control and shape its own RF radiation pattern. The first and second extension portions automatically redirect the beam to suppress harmful emissions without requiring external absorber materials or additional components, making the system self-sufficient and reducing overall 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 Vivaldi antenna system with extensions effectively reduces energy losses and cross-talk, providing a stronger, more focused signal that accurately detects user motion without unintentionally activating the authentication process, thus improving the reliability of the vehicle door opening mechanism.
Implementation Method 1
the extensions, or wings, which improve the focus of the radiated RF beam, and increases the emission power
Implementation Method 2
The extensions, or wings, change the energy distribution within the Vivaldi antenna trace, preventing the emission of a rear or a flank signal
Data Source
AI summary
A detection system for a vehicle, including at least one detection device operable for detecting objects in a detection area. The detection device also includes a first emission antenna, a first reception antenna, and a plurality of extension portions. One of the plurality of extension portions is integrally formed as part of the first emission antenna, and another of the plurality of extension portions is integrally formed as part of the first reception antenna. The first emission antenna generates an emission wave at a predetermined angle which contacts objects in the first detection area and deflects of the objects in the first detection area, and returns to the first reception antenna as a return wave. In an embodiment, the first emission antenna includes at least one Vivaldi wing, and the first reception antenna includes at least one Vivaldi wing.