In-Vehicle Antenna Module Layout for Multi-Band Metal Casing Isolation
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Solution Overview
Problem
Designing an antenna module that can provide multiple frequency bands and be disposed within a metal vehicle casing without being affected by the metal environment, as existing antennas face performance degradation and damage issues when integrated into vehicle structures.
Innovation Solution
The antenna module comprises a first GPS antenna and a second LTE antenna, both with unique radiator designs that form a planar inverted-F antenna (PIFA) structure, allowing them to resonate multiple frequency bands while minimizing interference from the metal casing. The antennas are positioned with their own ground ends for isolation and are integrated into an in-vehicle infotainment device with specific placement to optimize performance within the metal casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is disposed outside the vehicle, then the antenna performance is maintained, but the antenna is prone to breakage or damage
Solution Approach 1:
The antenna module is nested within the metal vehicle casing, with the antenna element integrated into the infotainment device housing that is disposed inside the vehicle. This nested configuration protects the antenna from external damage while maintaining its electromagnetic radiation function.
2Strength
If the antenna is disposed inside the metal vehicle casing, then the antenna is protected from damage, but the metal casing affects antenna performance
Solution Approach 1:
An insulating structure is introduced as an intermediary between the antenna element and the metal vehicle casing. This insulating structure electrically isolates the antenna from the conductive metal casing, preventing the casing from interfering with the antenna's electromagnetic radiation while maintaining physical protection.
Solution Approach 2:
The insulating structure is implemented as a thin film or shell that covers the antenna element or lines the interior of the metal casing. This thin insulating layer effectively blocks electromagnetic interference from the metal casing while occupying minimal space.
3Device complexity
If a single antenna structure is used, then the device complexity is reduced, but multiple frequency bands cannot be provided
Solution Approach 1:
The antenna element is designed with a specific geometry (such as a fractal pattern, meander line, or multi-segment structure) that enables it to resonate at multiple frequency bands simultaneously. This single multi-functional antenna structure replaces what would traditionally require multiple separate antennas, maintaining simplicity while achieving broad frequency coverage for GPS, LTE, and other wireless communications.
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 solution enables effective communication across multiple frequency bands with reduced susceptibility to metal casing interference, maintaining good antenna efficiency and isolation, thus achieving stable performance within the constraints of a metal vehicle environment.
Implementation Method 1
The first antenna is configured to resonate a first high frequency band... The second antenna is configured to resonate a low frequency band and a second high frequency band
Data Source
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AI summary
An antenna module (50) includes a first antenna (60) and a second antenna (70) disposed beside the first antenna (60). The second antenna (70) has a second feed-in end (A1) and a second ground end (78) and includes a first radiator (72), a second radiator (74) and a third radiator (76). The first radiator (72) extends from the second feed-in end (A1) along a direction and has a first slit (80). The second radiator (74) extends from the second feed-in end (A1) along another direction opposite to the direction, is connected to the second ground end (78) in a bent manner, and has a portion of a second slit (81). The third radiator (76) extends from the second ground end (78) along the direction. Another portion of the second slit (81) is disposed between the first radiator (72) and the third radiator (76).