Windshield Antenna Layout With Keep-Out Zone for Defrost Isolation
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Solution Overview
Problem
Existing vehicle windshields face challenges in integrating antennas with defrosters without increasing production complexity and cost, while maintaining efficient defrosting capabilities and minimizing electromagnetic interference.
Innovation Solution
A defrost and antenna system is implemented where a transparent electrically conductive material is used between the inner and outer glass panes of the windshield, with a keep out zone electrically isolating the defroster portion from the antenna portion, allowing for discrete dots or patterns to minimize visual noticeability and electromagnetic interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a transparent electrically conductive material is used for both defroster and antenna functions, then production complexity and cost are reduced, but electromagnetic interference between defroster and antenna increases
Solution Approach 1:
The transparent electrically conductive material is segmented into functionally distinct regions: a defroster portion with higher electrical conductivity for heat generation, and an antenna portion with lower electrical conductivity for electromagnetic radiation. This segmentation is achieved by controlling the concentration, distribution, or properties of conductive particles in different zones, allowing both functions to coexist in the same windshield layer without electromagnetic interference.
Solution Approach 2:
Different regions of the transparent electrically conductive material are赋予 different electrical properties to suit their specific functions. The defroster region has optimized conductivity for efficient heating, while the antenna region has adjusted conductivity for optimal electromagnetic performance. This local differentiation resolves the contradiction by allowing each function to operate independently with its own optimal characteristics.
2Area of stationary object
If the antenna radiator is placed close to the defroster portion, then space is saved, but electromagnetic interference increases
Solution Approach 1:
The transparent electrically conductive material is segmented into functionally distinct regions: a defroster portion with higher electrical conductivity for heat generation, and an antenna portion with lower electrical conductivity for electromagnetic radiation. This segmentation is achieved by controlling the concentration, distribution, or properties of conductive particles in different zones, allowing both functions to coexist in the same windshield layer without electromagnetic interference.
Solution Approach 2:
Different regions of the transparent electrically conductive material are赋予 different electrical properties to suit their specific functions. The defroster region has optimized conductivity for efficient heating, while the antenna region has adjusted conductivity for optimal electromagnetic performance. This local differentiation resolves the contradiction by allowing each function to operate independently with its own optimal characteristics.
3Power
If the transparent electrically conductive material has high conductivity, then defrosting efficiency is improved, but antenna radiation efficiency deteriorates
Solution Approach 1:
The transparent electrically conductive material is segmented into functionally distinct regions: a defroster portion with higher electrical conductivity for heat generation, and an antenna portion with lower electrical conductivity for electromagnetic radiation. This segmentation is achieved by controlling the concentration, distribution, or properties of conductive particles in different zones, allowing both functions to coexist in the same windshield layer without electromagnetic interference.
Solution Approach 2:
Different regions of the transparent electrically conductive material are赋予 different electrical properties to suit their specific functions. The defroster region has optimized conductivity for efficient heating, while the antenna region has adjusted conductivity for optimal electromagnetic performance. This local differentiation resolves the contradiction by allowing each function to operate independently with its own optimal characteristics.
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 saves space, reduces production complexity and cost, and enhances radiation efficiency of the antenna by minimizing electromagnetic interference, while maintaining effective defrosting capabilities.
Implementation Method 1
a defroster portion configured to generate heat when power is applied to the defroster portion
Data Source
AI summary
A defrost and antenna system includes: a first glass pane including a first surface facing a passenger cabin of a vehicle and a second surface opposite the first surface; a second glass pane including a third surface facing the second surface and a fourth surface facing environment outside of the vehicle; and a keep out zone disposed between the second and third surfaces; and transparent electrically conductive material disposed between the second and third surfaces, the transparent electrically conductive material including: a defroster portion configured to generate heat when power is applied to the defroster portion; and an antenna radiator that is electrically isolated from the defroster portion by the keep out zone.