Heatable Windscreen Antenna with Isolated Signal Section
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Solution Overview
Problem
Conventional electrically heatable antenna panes face challenges in achieving satisfactory reception performance across various frequency bands without compromising the heating function, due to high electrical surface resistance and capacitive coupling with the vehicle body, which limits their effectiveness in both heating and antenna functions.
Innovation Solution
An electrically heatable antenna pane design featuring a transparent substrate with an electrically conductive heating layer, busbars, and strategically positioned antenna connections, including a second antenna connection isolated from the heating layer to minimize interference and enhance signal transmission, forming a hybrid antenna structure that combines planar and line antennas for improved bandwidth and reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the edge area is widened to reduce capacitive coupling with the vehicle body, then the reception performance is improved, but the heat-ray-reflecting property and optical appearance deteriorate
Solution Approach 1:
The edge region is implemented as a segmented insulating structure rather than a continuous wide border. The separating lines create discrete insulation zones that provide capacitive decoupling without forming a large continuous non-reflective area, thus maintaining both reception performance and thermal reflection properties
Solution Approach 2:
The insulating structures (edge region and separating lines) are implemented as thin film or line-like features that provide electrical insulation with minimal impact on the optical and thermal properties of the glass pane, allowing the majority of the surface to maintain its heat-ray-reflecting function
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 design achieves enhanced reception performance across the complete frequency range of bands I to V with minimal impact on the heating function, utilizing a hybrid antenna structure that optimizes signal transmission and reduces interference, making it suitable for use in motor vehicles.
Implementation Method 1
an electrical heating layer (6) which extends at least over part of a pane surface and which can serve at least in sections as a surface antenna for receiving and/or transmitting electromagnetic waves
Implementation Method 2
the section is capacitively coupled to the adjacent heating layer for the transmission of antenna signals
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The electrically heatable windscreen antenna (100) according to the invention comprises at least the following: a transparent pane (1); an electric heating layer (6) which extends at least over a part of a pane surface (III) and which is used at least partly as a flat antenna for receiving and/or transmitting electromagnetic waves; at least one first busbar (5a) and a second busbar (5b) which can be electrically connected to a voltage source and which are directly contacted with the heating layer (6) in an electrically conductive manner such that a heating current (16) flows over a heating field (17) formed by the heating layer (6) after a feed voltage is applied; a first antenna connection (8) which is directly contacted with the heating layer (6) in an electrically conductive manner; and a second antenna connection (9) which is directly contacted with a portion (11) of the heating layer (6) in an electrically conductive manner. The portion (11) is electrically insulated from the rest of the heating layer (6) against direct currents by a heating layer-free separation region (10), and the portion (11) is coupled to the adjoining heating layer (6) in a capacitive manner in order to transmit antenna signals.