Overlapping Slit Antenna Linear Element V2X Design
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Solution Overview
Problem
Conventional dipole antennas for V2X communication face performance deterioration due to the presence of conductor transmission lines, making it difficult to design antenna devices without compromising performance.
Innovation Solution
An antenna device with a slit antenna integrated on a dielectric substrate, where a linear element on one surface overlaps with the slit antenna on the opposite surface, eliminating the need for a transmission line on the second surface and allowing for easier design by incorporating the linear element into the slit antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dipole antenna is installed vertically with a conductor transmission line, then the antenna can be fed power, but the radiation pattern is distorted and performance deteriorates
Solution Approach 1:
The invention merges the transmission line function with the antenna radiation element by using the linear element on the first surface to serve both as the feeding transmission line and as part of the radiating structure. The linear element is positioned to overlap with the slit antenna on the second surface, creating a integrated structure that eliminates the need for separate transmission lines while maintaining proper power feeding and improving radiation characteristics.
2Ease of manufacture
If a transmission line is arranged parallel to the antenna element, then power can be fed to the antenna, but the radiation pattern becomes distorted
Solution Approach 1:
The invention transitions from a two-dimensional planar arrangement where the transmission line is parallel to the antenna element to a three-dimensional overlapping configuration. The linear element on the first surface overlaps with the slit antenna on the second surface when viewed from the normal direction, effectively using the third dimension (depth/thickness of the substrate) to separate the feeding function from the radiation function while maintaining compact integration.
3Ease of operation
If a dipole antenna is designed with transmission lines, then the antenna can be fed, but the design becomes difficult and performance deteriorates
Solution Approach 1:
The invention combines the transmission line and antenna element into a single integrated structure where the linear element serves dual purposes. This merging simplifies the design process by eliminating the need to separately arrange transmission lines and antenna elements, while simultaneously improving performance by removing the harmful parallel arrangement that causes radiation pattern distortion.
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 the slit antenna to operate without a transmission line, improving the antenna's design ease and performance by enhancing average gain and reducing losses, while also allowing the antenna to function across multiple frequency bands, including 5.9 GHz for V2X communication and 925 MHz for remote control systems.
Implementation Method 1
a linear element is provided on a first surface of the dielectric substrate, a slit antenna is provided on a second surface of the dielectric substrate opposite to the first surface, and when the first surface and the second surface are superimposed on each other, the linear element and a slit of the slit antenna overlap with each other
Data Source
AI summary
An antenna device includes an antenna board in which a conductor pattern is provided on each of both surfaces of a dielectric substrate. A linear element is provided on a first surface of the dielectric substrate. A slit antenna is provided on a second surface of the dielectric substrate opposite to the first surface. When the first surface and the second surface are superimposed on each other, the linear element and a slit of the slit antenna overlap with each other.