Vehicle Antenna-Camera Layout for Lower Electromagnetic Interference
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Solution Overview
Problem
Antenna devices for vehicles face challenges in improving antenna gain while accommodating antennas and cameras in a design that minimizes fluid resistance, requiring innovative configurations to reduce electromagnetic interference and enhance performance.
Innovation Solution
The antenna device incorporates a capacitance loading element with a meander wiring shape, positioned separately from the camera, with specific length gradients and orientations to minimize electromagnetic influence, and is disposed in a higher position with an inner case for improved water-proofing and management, along with a camera system that captures rearviews and reduces noise through a magnetic cable and grounded external conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitance loading element is positioned closer to the camera to reduce overall space usage, then device compactness is improved, but electromagnetic interference between the camera and capacitance loading element increases, degrading antenna gain
Solution Approach 1:
The capacitance loading element is arranged in the height direction (vertical dimension) rather than only in the horizontal plane. By extending the element vertically with portions at different heights, the design utilizes the third dimension to achieve both compactness and electromagnetic isolation, as the camera and capacitance loading element operate in different vertical zones reducing interference while maintaining small footprint.
Solution Approach 2:
The capacitance loading element is divided into multiple portions (first portion and second portion) at different heights. This segmentation allows different segments to serve different functions while being spatially separated to minimize electromagnetic coupling with the camera, resolving the contradiction between compactness and interference reduction.
2Shape
If the antenna device is designed with a shark fin shape to reduce fluid resistance, then aerodynamic performance is improved, but the internal space for accommodating antennas and cameras is constrained
Solution Approach 1:
The patent utilizes the height direction (vertical dimension) to arrange antenna elements and camera components. By stacking components vertically within the fin structure rather than spreading them horizontally, the design maximizes the use of available space within the aerodynamic shark fin shape, accommodating multiple components without compromising the streamlined exterior.
3Adaptability or versatility
If multiple antennas and electronic devices are accommodated inside the antenna device, then functionality is improved, but electromagnetic interference between components increases, affecting antenna gain
Solution Approach 1:
Multiple antenna elements and the camera are arranged in the height direction at different vertical positions. This vertical stacking creates natural electromagnetic isolation between components that would otherwise be in close proximity in a planar arrangement, allowing multiple functional elements to coexist with minimal interference.
Solution Approach 2:
The patent integrates multiple functional components (antennas, camera, capacitance loading elements) within a nested hierarchical structure where components are positioned at different vertical levels, with the case providing outer containment and internal structures providing layered organization that isolates electromagnetic sources.
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 enhances antenna gain by reducing electromagnetic interference, improves water-proofing, and facilitates efficient management and noise reduction, resulting in improved performance and efficiency.
Implementation Method 1
the antenna includes a capacitance loading element disposed at a position separate from the camera
Data Source
AI summary
An antenna device for a vehicle, the antenna device includes; an antenna; a camera; and a case that accommodates the antenna and the camera, wherein the antenna includes a capacitance loading element disposed at a position separate from the camera, and when the capacitance loading element is divided into a short-distance-side portion and a long-distance-side portion based on a distance from the camera, a length of a first portion of the short-distance-side portion is shorter than a length of a second portion of the short-distance-side portion in a height direction, in which the first portion overlaps the camera in top view and/or side view while the second portion does not overlap the camera in top view and/or side view.