Vehicle Antenna Shield Grounding via Compressible Bumpers
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Solution Overview
Problem
Existing antenna assemblies for vehicles face challenges in achieving a reliable electrical ground connection and effective shielding against electromagnetic interference (EMI) and radio frequency interference (RFI), particularly when mounted on vehicle body walls like roofs, hoods, or trunk lids, due to the need for mechanical fasteners that can compromise the antenna's performance and increase complexity in installation.
Innovation Solution
The antenna assembly incorporates resiliently compressible bumpers between the radome and shield, which compress to generate a constant force that securely grounds the shield to the chassis, improving electrical connectivity and providing EMI/RFI shielding without the need for conventional mechanical fasteners, thus enhancing the antenna's performance and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mechanical fasteners are used to ground the shield to the chassis, then a reliable electrical ground connection can be achieved, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent replaces conventional mechanical fasteners (screws, bolts, clips) with resiliently compressible bumpers that use elastic deformation to generate grounding force. The bumpers compress between the radome and shield, creating continuous electrical contact through material compliance rather than mechanical fastening, thereby simplifying the assembly process while maintaining reliable grounding.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the grounding interface by using materials with specific resilient and conductive characteristics. The bumpers are designed with controlled elasticity and electrical conductivity parameters, allowing them to deform under compression and maintain consistent electrical contact pressure without requiring precise mechanical fastening torque or alignment.
2Reliability
If conventional mechanical fasteners are used to ground the shield, then electrical connectivity can be achieved, but the number of parts and manufacturing complexity increase
Solution Approach 1:
The patent merges multiple functions into the bumper component: electrical grounding, mechanical spacing maintenance, and shock absorption. By integrating these functions into a single element rather than using separate fasteners and gaskets, the manufacturing process is simplified and the number of discrete parts is reduced, lowering assembly complexity and production costs.
Solution Approach 2:
The bumpers are constructed from composite materials that simultaneously provide electrical conductivity for grounding and resilient elasticity for mechanical compliance. This material combination allows the single component to achieve both electrical connectivity and mechanical function without requiring additional fasteners or separate grounding elements, thereby reducing manufacturing complexity.
3Device complexity
If the antenna assembly uses simple mounting without resilient bumpers, then the structure is simpler, but the shielding against EMI/RFI and electrical grounding are compromised
Solution Approach 1:
The resilient bumpers serve as an intermediary element between the radome and shield, providing a compliant interface that ensures continuous electrical contact. This intermediary component mediates the connection, allowing the shield to maintain reliable grounding and effective EMI/RFI shielding while accommodating manufacturing tolerances and assembly variations without requiring complex rigid fastening structures.
4Reliability
If mechanical fasteners are used for grounding, then reliable electrical connection is achieved, but the installation time and labor requirements increase
Solution Approach 1:
The resilient bumpers are designed to self-compress and self-position between the radome and shield during assembly. The elastic deformation of the bumpers automatically generates the necessary grounding force without requiring external fastening operations, allowing the electrical connection to be established simply by assembling the components in their correct positions, thereby dramatically reducing installation time and labor requirements.
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 solution ensures a reliable electrical ground connection and effective shielding against EMI/RFI, reducing the complexity of antenna assembly and installation while maintaining a compact footprint and lowering production costs by eliminating the need for mechanical fasteners.
Implementation Method 1
Two or more resiliently compressible bumpers are spaced apart and compressively sandwiched generally between the radome and the shield. Compression of the bumpers generates a compressive force urging the shield generally towards the chassis that aids in electrically grounding of the shield with the chassis.
Data Source
AI summary
According to various aspects, exemplary embodiments are provided of antenna assemblies. In one exemplary embodiment, an antenna assembly suitable for installation to a vehicle body wall generally comprises a chassis, a radome, and a shield disposed generally between the chassis and radome. Two or more resiliently compressible bumpers are spaced apart and compressively sandwiched generally between the radome and the shield. Compression of the bumpers generates a compressive force urging the shield generally towards the chassis that aids in electrically grounding of the shield with the chassis.