Antenna Device Metal Fixing Portion Placement
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Solution Overview
Problem
Existing V2X antennas installed in vehicles face challenges in maintaining desired directionality and antenna gain when using metal brackets for fixation, as they can alter the transceiving properties of radio waves, leading to reduced performance.
Innovation Solution
An antenna device with an attachment member featuring a metal fixing portion disposed between specific regions on the back face of the housing portion, aligned with the extension direction of the second straight line, which minimizes interference with the radiation plate and maintains the antenna's directionality and gain by avoiding strong electric field areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a metal bracket is used to fix the antenna housing to the vehicle, then the attachment stability is improved, but the antenna gain decreases due to interference with radio wave transceiving
Solution Approach 1:
The patent introduces a positioning member as an intermediary component between the metal fixing portion and the housing. This positioning member, made of non-conductive material, mediates the connection to prevent direct contact between metal and housing, thereby eliminating the harmful effect of metal interference on radio waves while maintaining the mechanical fixing function
Solution Approach 2:
The fixing structure is segmented into distinct functional parts: a metal fixing portion for attachment stability, a non-conductive positioning member for electrical isolation, and specific positioning structures (protrusions and recesses) for precise placement. This segmentation allows each component to perform its specific function without interfering with others
2Reliability
If the metal fixing portion is positioned to ensure stable attachment, then the attachment reliability is improved, but the directionality of the antenna deteriorates due to interference with the radiation pattern
Solution Approach 1:
The patent applies local quality by creating specific non-interference zones around the radiation plate where metal is excluded. The positioning member is designed with protrusions and recesses that precisely position the metal fixing portion in areas that do not overlap with the radiation pattern, ensuring local electromagnetic quality is maintained while providing overall structural reliability
Solution Approach 2:
The patent resolves the conflict by transitioning to a different dimensional approach - using a three-dimensional positioning structure with protrusions and recesses that establish precise spatial relationships. This dimensional solution allows the metal fixing portion to be positioned in space without interfering with the two-dimensional radiation pattern of the antenna
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 solution enables stable attachment of the antenna to a vehicle while suppressing a drop in antenna gain and ensuring desired directionality across a range of ±90° in the horizontal plane, maintaining effective transceiving properties.
Implementation Method 1
a radiation plate provided with a radiation face that radiates linearly polarized waves of a prescribed frequency band
Implementation Method 2
a metal fixing portion that is formed in an elongated shape to one end of the attachment member, that abuts a back face of the housing portion on an opposite side of the radiation plate to the radiation face side, and that fixes the housing portion
Data Source
AI summary
An antenna device with an attachment member includes an antenna including a radiation plate provided with radiation face that radiates vertically polarized waves, a housing portion that houses the antenna, an attachment member that attaches the housing portion to a vehicle, and a metal fixing portion that is formed in an elongated shape to one end of the attachment member, that abuts a back face of the housing portion facing toward an opposite side to the radiation face, and that fixes the housing portion. Viewed from a thickness direction of the radiation plate, the fixing portion is disposed between a first region formed to the back face on one side in the extension direction of a first straight line, and a second region formed to the back face on another side in the extension direction of the first straight line.