Vehicle Window Glass Antenna Layout With Overlapping Conductive Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a trade-off relationship between securing the shape and arrangement of an antenna and a conductive region in vehicle window glass, where the antenna is provided in a non-conductive region extending around a conductive region for anti-fogging, making it difficult to secure an appropriate conductive region.
Innovation Solution
A laminated glass structure with a planar antenna disposed between two glass plates and a conductive member separated from the antenna, allowing overlap in a plan view, which facilitates securing regions for both components and improves antenna gain by using the conductive member as a reflector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the antenna is provided in a non-conductive region extending around a conductive region for anti-fogging, then the antenna can be disposed, but the degree of freedom of the shape and arrangement of the antenna is limited
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where the antenna must be entirely within the non-conductive region to a three-dimensional arrangement where the antenna overlaps the conductive region in the thickness direction. This dimensional change allows the antenna to utilize both conductive and non-conductive regions simultaneously, resolving the contradiction between ease of arrangement and shape freedom.
Solution Approach 2:
The antenna structure is designed to be nested across different layers: part of the antenna is disposed in the non-conductive region while another part overlaps the conductive region in the thickness direction. This nesting approach allows the antenna to incorporate both regions without interfering with each other's primary functions.
2Reliability
If an attempt is made to secure a sufficient conductive region, then the anti-fogging function is ensured, but the region where the antenna is disposed is limited
Solution Approach 1:
By utilizing the thickness direction (z-axis) as an additional dimension, the antenna can overlap the conductive region without occupying lateral space that would be needed for the non-conductive region. This allows both the conductive region to maintain its full area for anti-fogging and the antenna to have sufficient disposal region through vertical stacking.
Solution Approach 2:
The antenna is segmented into multiple parts: one part disposed in the non-conductive region and another part overlapping the conductive region. This segmentation allows the antenna to function effectively while the conductive region maintains its full area for heating purposes, resolving the spatial conflict between the two components.
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 enables easy disposition of both the antenna and conductive member, enhancing the antenna's directivity and allowing sufficient space for both components, while also improving radio wave reflection and heat generation capabilities.
Implementation Method 1
a conductive member that heats a glass plate by applying a voltage to a pair of bus bars for anti-fogging and anti-icing
Implementation Method 2
improves antenna gain by using the conductive member as a reflector
Data Source
AI summary
A window glass for a vehicle comprises a laminated glass for a vehicle including a first glass plate having a first main surface and a second main surface opposite to the first main surface, a second glass plate having a third main surface facing the second main surface and a fourth main surface opposite to the third main surface, and an interlayer film disposed between the second main surface and the third main surface, a planar antenna disposed between the second main surface and the third main surface, and a conductive member that is separated from the antenna in a direction from the first glass plate toward the second glass plate and overlaps at least a part of the antenna in a plan view of the laminated glass.