Vehicle Window Glass Heating Layout for Antenna Gain
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Solution Overview
Problem
In vehicle window glass apparatuses with heating areas for defogging, the space for antennas is reduced due to the size of the heating area, leading to insufficient antenna gain in certain frequency bands.
Innovation Solution
A window glass apparatus design featuring a glass plate with a heating area between bus bars and a non-heating area above, allowing an antenna to be positioned in a space near the upper bus bar portion, ensuring sufficient antenna gain by spacing the antenna conductor apart from the glass plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating area is provided in the window glass for defogging, then defogging performance is improved, but the area available for antenna disposal is reduced
Solution Approach 1:
The window glass is divided into distinct functional zones: a heating area with conductive members for defogging, and a non-heating area above the upper bus bar for antenna disposal. This spatial segmentation allows both functions to coexist without interference, maintaining defogging performance while providing sufficient area for the antenna to achieve required gain.
2Area of stationary object
If the antenna is disposed near the heating area, then space utilization is improved, but antenna gain becomes insufficient
Solution Approach 1:
The antenna is disposed in a specific local region (non-heating area above the upper bus bar) where the electromagnetic environment is favorable for signal transmission. This localized disposal ensures sufficient antenna gain while still utilizing the overall window glass space efficiently.
Solution Approach 2:
The upper bus bar serves as an intermediary structure that separates the heating area from the antenna disposal area. By positioning the antenna above the upper bus bar in the non-heating area, the design creates a favorable electromagnetic environment for the antenna while maintaining space utilization.
3Ease of manufacture
If the antenna conductor is placed close to the glass plate, then installation simplicity is improved, but antenna performance deteriorates
Solution Approach 1:
Instead of placing the antenna conductor in the plane of the glass plate, the design positions it in a different spatial dimension (above the upper bus bar in the non-heating area). This dimensional change improves antenna performance by providing a favorable electromagnetic environment while maintaining relative installation simplicity.
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 design enables a window glass apparatus that is compatible with antennas, ensuring sufficient antenna gain in specific frequency bands while maintaining effective defogging and heating performance.
Implementation Method 1
the heating area is an area where the conductive member is disposed, the conductive member being configured to flow a direct current in an up-down direction by applying the direct voltage between the first bus bar and the second bus bar by the power supply such that the heating area is heated by heat generation of the conductive member
Data Source
AI summary
A window glass apparatus for a vehicle including a first bus bar provided in or on the glass plate and including an upper portion extending in a direction along an upper edge of the glass plate; a second bus bar provided in or on the glass plate and including a lower portion extending in a direction along a lower edge of the glass plate; and an antenna disposed in a space near the upper portion and configured to transmit and receive a radio wave having a certain frequency; wherein the glass plate has a heating area extending between the upper portion and the lower portion, and a non-heating area extending above the upper portion; wherein the heating area is an area where a conductive member is disposed, the conductive member being configured to flow a direct current in an up-down direction.