Chassis-Integrated Slot Antenna for Vehicle Control Modules
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Solution Overview
Problem
The limited space within vehicles and wire harness routing constraints make it challenging to effectively position control modules for short-range wireless communication, often requiring compromises in antenna design that impair performance.
Innovation Solution
A control module with a conductive metal chassis featuring a non-conductive slot antenna structure, formed by creating an aperture between the chassis body and lid, tuned to specific communication frequencies, providing efficient energy coupling and omni-directional signal coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control modules are positioned near functional areas to minimize wiring harness length, then wiring complexity is reduced, but vehicle space utilization becomes problematic due to limited packaging environment
Solution Approach 1:
The patent combines the control module housing with the antenna structure by integrating a slot antenna directly into the chassis lid. This merging eliminates the need for separate antenna components and their associated wiring, thereby reducing wiring harness complexity while maintaining compact vehicle space utilization.
2Volume of moving object
If antenna size and shape are adjusted to fit packaging space, then vehicle integration is improved, but antenna performance characteristics are impaired
Solution Approach 1:
The patent achieves optimal antenna performance within limited space by carefully controlling the slot antenna dimensions, specifically setting the length to approximately half the wavelength of the operating frequency. This parameter optimization allows the antenna to maintain effective radiation characteristics while fitting within the chassis lid packaging constraints.
3Reliability
If slot antenna length is optimized for specific communication frequency, then signal throughput is enhanced, but antenna design flexibility is reduced
Solution Approach 1:
The patent implements different slot antenna length configurations for different chassis types (full-size vs. compact vehicles). By tailoring the antenna dimensions to specific vehicle categories and their corresponding communication frequency requirements, the design achieves optimal signal throughput for each application while maintaining overall design flexibility across product lines.
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 slot antenna design enhances signal throughput and reduces signal loss, allowing for flexible packaging and robust communication within vehicles while maintaining effective range and performance.
Implementation Method 1
One method to design an antenna is to create an electrical resonate structure. When electrically excited at the resonant frequency, the resonate structure 'leaks' energy that radiates away from the structure.
Data Source
AI summary
A control module has a conductive metal chassis with a chassis body and a chassis lid. A non-conductive opening is formed within the chassis body and a tab extends from the chassis lid engaging edges of the non-conductive opening to create a rectangularly-shaped non-conductive aperture with a longitudinal axis having a predetermined length for forming a slot antenna structure. The predetermined length is designed to communicate with a specific communications frequency. The slot antenna structure is signally interconnected to a transceiver housed within the chassis.