Dielectric-Mounted Patch Antenna Enclosure for EMI Shielding
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Solution Overview
Problem
Patch antennas mounted to vehicle interior surfaces face challenges due to electromagnetic interference from electrically conductive glass coatings, leading to reduced reception performance and increased electromagnetic interference within the vehicle cabin.
Innovation Solution
An antenna assembly with a conductive enclosure mounted to a dielectric structure, featuring a cavity that contains the antenna and is constructed of electrically conductive material, creating an electromagnetic seal and directing electromagnetic radiation away from the vehicle interior, while allowing transmission and reception through the dielectric structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a patch antenna is mounted to the interior surface of a windshield or sunroof, then satellite radio reception and other wireless services are enabled, but electromagnetic interference from conductive glass coatings and interior electronic devices degrades reception performance
Solution Approach 1:
The antenna system is segmented into two distinct parts: the radiating patch antenna element and the conductive enclosure. This segmentation allows the antenna to transmit/receive signals while the enclosure provides electromagnetic isolation, resolving the contradiction by separating the radiation function from the shielding function.
Solution Approach 2:
The conductive enclosure acts as an intermediary between the antenna and the electromagnetic environment. It mediates the interaction by providing a controlled electromagnetic boundary that blocks interference from conductive glass coatings and interior devices while allowing the antenna to maintain its radiation pattern toward the exterior.
2Adaptability or versatility
If additional electronic devices are introduced to vehicles to provide new features, then customer functionality is enhanced, but electromagnetic interference within the interior cabin increases
Solution Approach 1:
The harmful electromagnetic interference is extracted from the antenna's operational environment by introducing the conductive enclosure. This enclosure selectively excludes interior electronic devices' emissions from affecting the antenna, while maintaining the antenna's ability to communicate with exterior systems.
3Reliability
If electrically conductive glass coatings are applied to the interior surface of the windshield, then anti-reflective and infrared properties are improved, but electromagnetic interference to the antenna increases
Solution Approach 1:
The conductive enclosure provides localized electromagnetic shielding specifically at the antenna location. This local quality enhancement allows the glass coating to maintain its anti-reflective and infrared properties across the entire windshield surface, while the enclosure locally protects the antenna from interference generated by these conductive coatings.
4Reliability
If the antenna gain is increased to exceed the minimum threshold, then signal reception effectiveness is improved, but directionality and physical arrangement constraints are violated
Solution Approach 1:
The conductive enclosure counteracts the limiting effects of the antenna's low gain and non-directional characteristics by providing electromagnetic isolation. This enclosure effectively compensates for the antenna's inability to achieve high gain through complex arrangement, allowing the use of simpler, lower-gain antenna elements while maintaining effective communication.
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 assembly reduces electromagnetic interference, enhances antenna directionality, and increases realized gain by limiting electromagnetic radiation into the vehicle interior, thereby improving signal reception and transmission performance.
Implementation Method 1
the electrically conductive material of the conductive enclosure urges electromagnetic radiation transmitted from the aperture of the conductive patch of the antenna to a space above the exterior surface of the dielectric structure
Implementation Method 2
reduces the amount of electromagnetic interference experienced by a patch antenna mounted to an interior glass surface of a vehicle
Data Source
AI summary
An antenna assembly mounted to an interior surface of a dielectric structure includes an antenna including a conductive patch defining an aperture, an upper surface, and a lower surface, where the upper surface of the conductive patch of the antenna faces the interior surface of the dielectric structure. The antenna assembly also includes a conductive enclosure mounted to the interior surface of the dielectric structure. The conductive enclosure includes a main body constructed at least in part of an electrically conductive material, where the main body of the conductive enclosure defines a cavity containing the antenna. The electrically conductive material of the conductive enclosure urges the electromagnetic radiation transmitted from the aperture of the conductive patch of the antenna to a space above the exterior surface of the dielectric structure.