Vehicle Window Antenna Layout for Wide-Angle V2X Directivity
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Solution Overview
Problem
Existing vehicle-to-everything (V2X) antennas face challenges in achieving omnidirectional directivity, particularly in the left-right direction, often requiring additional antennas and processing units, which increases cost.
Innovation Solution
An antenna device with a radio wave transmissive body, such as a windshield or rear window, is positioned at a predetermined angle, displacing the overlapping portion to ensure directivity over a wide range with a minimal number of antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If antennas are added to both left and right sides of the vehicle to ensure wide range directivity, then directivity coverage is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies asymmetry by intentionally displacing the overlapping portion of the radio wave transmissive body from the central position to a non-central position. This asymmetric arrangement creates specific reflection paths that enable wide-angle directivity coverage without requiring additional antennas on both left and right sides. The asymmetric displacement allows the antenna system to achieve omnidirectional performance using a minimal number of antennas by optimizing the geometric relationship between the antenna and the transmissive body.
2Adaptability or versatility
If antennas are added to both left and right sides of the vehicle to ensure wide range directivity, then directivity coverage is improved, but cost increases
Solution Approach 1:
The patent merges the functions of multiple potential antennas into a single antenna system by utilizing the radio wave transmissive body as an active component. The transmissive body serves dual purposes: it allows radio wave transmission while its displaced overlapping portion creates reflective paths that extend the effective coverage area. This merging approach eliminates the need for separate antennas on both left and right sides, reducing the total number of antennas required while maintaining wide-angle directivity coverage.
3Adaptability or versatility
If the radio wave transmissive body is positioned at a predetermined angle with displaced overlapping portion, then directivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes by optimizing the inclination angle and displacement distance of the overlapping portion to achieve desired directivity characteristics. By carefully selecting specific parameter values for the angle and displacement, the system achieves wide-angle coverage while maintaining reasonable manufacturing tolerances. The predetermined angle and displacement distance are optimized to balance performance requirements with manufacturing feasibility.
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 ensures stable omnidirectional directivity without the need for additional antennas, reducing costs and improving gain in the left-right direction.
Implementation Method 1
an antenna to radiate radio waves toward a radio wave transmissive body... the radio wave transmissive body being inclined at a predetermined angle... a portion of the radio wave transmissive body that overlaps a projected image of the antenna is displaced
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An antenna device includes an antenna to radiate radio waves toward a radio wave transmissive body, the radio wave transmissive body including both end portions opposite to each other, the radio wave transmissive body being inclined at a predetermined angle with respect to a predetermined direction between the both end portions from one side to the other side in the predetermined direction, the radio waves being radiated from the other side, in which a portion of the radio wave transmissive body that overlaps a projected image of the antenna in the predetermined direction is displaced to a side on which an end portion of the both end portions on the one side of the radio wave transmissive body is positioned with respect to a central portion between the both end portions of the radio wave transmissive body.