Vehicle Windshield Antenna with Segmented Metallic Coating
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Solution Overview
Problem
Metallic coatings on vehicle windshields attenuate radio frequency signals, restricting wireless communication effectiveness while providing solar radiation control and defrosting capabilities.
Innovation Solution
A wireless communication apparatus with an antenna configuration that includes an active component and a parasitic element, where the active component is an electrical conductor and the parasitic element comprises elongated openings in the metallic coating, enhancing RF signal transmission through the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metallic coating is applied to the windshield, then solar radiation control and defrosting capabilities are improved, but radio frequency signal transmission is attenuated
Solution Approach 1:
The continuous metallic coating is segmented by forming elongated openings that extend in a direction substantially perpendicular to the electrical conductor. This segmentation allows RF signals to pass through the openings while the metallic coating segments between the openings continue to provide solar radiation control and defrosting capabilities.
Solution Approach 2:
The metallic coating is modified locally by creating elongated openings at specific positions and orientations. The openings are positioned to allow RF signal transmission while the surrounding metallic coating maintains its thermal and solar control properties in adjacent areas.
2Reliability
If an antenna is positioned close to the windshield interior surface, then communication effectiveness is improved, but the metallic coating continues to attenuate signals
Solution Approach 1:
The elongated openings in the metallic coating act as intermediaries that facilitate RF signal transmission from the antenna inside the vehicle to the exterior. The openings provide a pathway for the electromagnetic signals to pass through the otherwise blocking metallic coating without requiring the antenna to be positioned outside the vehicle.
3Reliability
If the electrical conductor extends in a first direction, then antenna functionality is maintained, but signal transmission through the coated windshield is restricted
Solution Approach 1:
The elongated openings are oriented in a direction substantially perpendicular to the electrical conductor, creating an asymmetric configuration. This asymmetric arrangement allows the electrical conductor to maintain its antenna functionality along its length while the perpendicular openings provide transmission pathways that do not interfere with the conductor's current flow and radiation pattern.
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
Improves the transmission of radio frequency signals through metallic-coated windshields, maintaining the benefits of solar radiation control and defrosting while enabling effective communication with toll readers and other wireless systems.
Implementation Method 1
an antenna configured to communicate via a radio frequency. The antenna comprises an electrical conductor and a plurality of elongated openings formed in the metallic coating
Implementation Method 2
Metallic coatings on vehicle windshields attenuate radio frequency signals, restricting wireless communication effectiveness while providing solar radiation control and defrosting capabilities
Data Source
AI summary
A communication apparatus for a vehicle is disclosed. The apparatus comprises a window comprising a metallic coating and forming an interior surface enclosing a portion of an interior compartment of the vehicle. The apparatus further comprises a wireless communication circuit comprising an antenna configured to communicate via a radio frequency. The antenna comprises an electrical conductor and a plurality of elongated openings formed in the metallic coating. The electrical conductor extends in a first direction and is in conductive connection with the communication circuit. The electrical conductor is disposed proximate to the interior surface of the window. The elongated openings extend in a second direction substantially perpendicular to the first direction. The elongated openings in combination with the electrical conductor provide for an improved transmission of the radio frequency.