Windshield Antenna Layout for V2X Interference and Gain Control
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Solution Overview
Problem
The challenge of radio wave interference and field of view obstruction between communication antennas and electronic devices mounted on vehicle windshields, particularly in V2X communication systems, leads to a drop in antenna gain and directional issues.
Innovation Solution
A vehicle antenna device with a radiation conductor attached to the windshield, inclined such that its second end portion is positioned further toward the lower edge, maintaining a prescribed distance from electronic devices, enhancing antenna gain and directionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the communication antenna is disposed close to the electronic device at the upper edge portion of the windshield, then the device complexity is reduced, but radio wave interference occurs between the antenna and electronic device
Solution Approach 1:
The patent transitions from horizontal separation to vertical separation by inclining the radiation surface. The radiation surface is inclined such that its normal forms an angle of 10° to 70° with the vehicle width direction, positioning the antenna's second end portion lower than the first end portion. This vertical arrangement in the up-down direction of the windshield effectively separates the antenna from electronic devices while maintaining compact installation.
2Object-affected harmful factors
If the communication antenna is disposed displaced to one side of the vehicle width central portion, then separation from electronic devices is achieved, but antenna gain drops in the prescribed direction
Solution Approach 1:
The patent employs asymmetric positioning where the radiation surface is inclined at a specific angle (normal forming 10° to 70° with vehicle width direction) rather than being symmetrically positioned. This asymmetric inclination optimizes both separation from centrally-mounted electronic devices and maintenance of antenna gain in the prescribed direction, resolving the contradiction between lateral displacement for interference avoidance and gain preservation.
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 effectively suppresses antenna gain drops and maintains excellent directionality by optimizing the separation and inclination of the antenna relative to electronic devices, reducing interference and field obstruction.
Implementation Method 1
a radiation conductor (56) including a radiation surface (56C) for transmitting and receiving radio waves of a prescribed frequency band
Data Source
AI summary
A vehicle antenna includes: a vehicle window glass an electronic device provided in a vicinity of a vehicle width direction central portion at or near upper portion of the vehicle window glass; and an antenna attached to the upper portion of the vehicle window glass such that a normal to a radiation surface passes through a principal surface. A vehicle width direction central position of the antenna is separated from a reference position that is a vehicle width direction center of the electronic device.