Coplanar Antenna System for Vehicle Side Mirror Integration
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Solution Overview
Problem
Existing vehicular antenna systems face challenges in providing omnidirectional coverage across all frequency bands while maintaining robustness and compact size, especially when integrated into vehicle side mirrors, due to limitations in traditional designs that are affected by vehicle morphology and frequency range.
Innovation Solution
A directive coplanar antenna system with a dipole and reflector disposed on a shared dielectric substrate of a printed circuit board, optimized for a 180° gain threshold, allowing integration in side mirrors and maintaining performance during position and orientation modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional external antennas are installed on the vehicle roof or rear window, then the antenna size and structure are simple, but the antenna coverage is limited and omnidirectionality is not achieved due to vehicle morphology effects
Solution Approach 1:
The antenna system is segmented into multiple independent antenna elements (at least two antennas) positioned at different locations on the vehicle. Each antenna element contributes to the overall omnidirectional coverage, allowing the system to achieve 360-degree coverage by combining the radiation patterns of individual elements rather than relying on a single complex antenna structure.
Solution Approach 2:
Multiple antenna elements are merged into a coordinated system where their radiation patterns are combined to achieve omnidirectional coverage. The system integrates signals from multiple antennas through a processing unit that coordinates their operation, merging their individual coverage areas to create complete 360-degree coverage while maintaining relatively simple individual antenna structures.
2Reliability
If traditional monopole antennas are used, then the antenna structure is simple, but the antenna performance is greatly affected by vehicle morphology such as roof size, shape and tilt
Solution Approach 1:
Different antenna elements are positioned at specific locations on the vehicle where they can operate with optimal characteristics. Each antenna is placed in a location that minimizes the impact of vehicle morphology, and the system uses local radiation patterns that are tailored to the specific geometric constraints of the vehicle body at each installation point.
Solution Approach 2:
The antenna system is designed to perform multiple functions: each antenna element can operate independently for directional communication, and collectively they provide omnidirectional coverage. The system can adapt to different vehicle morphologies by adjusting the coordination between elements, making it universally applicable to various vehicle types and configurations.
3Adaptability or versatility
If antennas are designed to cover all frequency bands for various wireless services, then the frequency coverage is comprehensive, but the antenna size increases making integration in side mirrors difficult
Solution Approach 1:
The frequency coverage function is segmented across multiple antenna elements, each potentially optimized for specific frequency ranges. The system achieves comprehensive multi-band coverage by coordinating these segmented elements rather than requiring each individual antenna to cover all frequencies, which would necessitate large physical dimensions.
Solution Approach 2:
The system transitions from a single-point antenna approach to a distributed spatial arrangement of multiple antenna elements. By utilizing the spatial dimension and positioning elements at different locations, the system achieves broad frequency coverage and omnidirectional patterns without requiring each element to be large, thus fitting within compact side mirror integrations.
4Volume of moving object
If the antenna system is integrated in side mirrors with compact size, then the integration is aesthetic and aerodynamic, but the antenna performance must remain robust against position and orientation modifications
Solution Approach 1:
Multiple antenna elements are merged into a coordinated system where the failure or degradation of one element does not compromise the overall system performance. The redundant configuration ensures that even if the side mirror experiences position or orientation changes that affect one antenna element, other elements maintain communication quality, providing robustness through diversity.
Solution Approach 2:
The system can dynamically adjust operational parameters such as signal weighting, phase alignment, and frequency selection based on the actual position and orientation of the side mirror. This adaptability allows the compact antenna integration to maintain robust communication performance despite mechanical variations in installation conditions.
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 antenna system achieves high-performance, omnidirectional communication across all required frequency bands, even when rotated or displaced, ensuring robust and compact integration in vehicle side mirrors.
Implementation Method 1
a directive coplanar antenna system with a dipole and reflector coplanarly disposed on a same dielectric substrate... The combination of the dipole and the reflector results in a directive antenna with a radiation that exceeds a given gain threshold in an angular range of at least 180°
Data Source
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AI summary
Antenna system (100) adapted for integration in side mirrors (200) of a vehicle (300). The antenna system (100) comprises two radiating conductors (110) and a reflector (130) coplanarly disposed on a same dielectric substrate of a printed circuit board. The radiating conductors (110) are connected to the reflector (130) through transmission lines (120) electromagnetically coupled to a frequency band of operation. In order to optimize the radiating of the antenna system in a 180° sector that covers one lateral of the vehicle (300), the reflector (130) is separated from the two radiating conductors (110) by a distance comprised between 0.3 times and 1 time the central wavelength (λ); and the reflector (130) is less than 6 times wider than the radiating conductors (110).