Low-Profile Multi-Band Antenna Using Ferrite for Vehicle Integration
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Solution Overview
Problem
Conventional automotive antennas require multiple antennas for different frequency bands, leading to increased size, maintenance costs, and integration challenges, while also causing signal interference due to their height and proximity to conductive vehicle surfaces, which affects aerodynamics and design.
Innovation Solution
A low-profile, multi-band antenna with a patch structure comprising multiple sub-patches and shorting pins, integrated with a ground plane and ferrite material, allowing efficient operation across multiple frequency bands with omnidirectional radiation and vertical polarization, reducing the need for multiple antennas and enhancing integration with vehicle design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate antennas are used for different frequency bands, then each antenna can be optimized for its specific band, but the number of antennas increases leading to larger system size, higher maintenance costs, and more integration challenges
Solution Approach 1:
The patent implements a single antenna structure that can operate across multiple frequency bands (e.g., 700 MHz, 1.9 GHz, 2.4 GHz, 5.8 GHz) by incorporating multiple radiating elements with different geometries and configurations. Each radiating element is designed to resonate at specific frequency bands, allowing one antenna to replace multiple separate antennas while maintaining optimal performance for each band
Solution Approach 2:
The patent combines multiple radiating elements, ground planes, and feeding structures into a single integrated antenna assembly. The multiple radiating elements are positioned and configured to work together, sharing common support structures and mounting mechanisms, thereby reducing the overall number of components and simplifying integration into the vehicle
2Reliability
If conventional antennas are placed far from conductive surfaces to avoid reflections and destructive interference, then signal quality improves, but the antenna height increases affecting vehicle aerodynamics and design integration
Solution Approach 1:
The patent introduces ferrite materials as intermediary substances positioned between the radiating elements and the vehicle's conductive surfaces. These ferrite materials act as magnetic shields that reduce the strength of electromagnetic fields interacting with the conductive surfaces, thereby minimizing reflections and destructive interference while allowing the antenna to be positioned closer to the surface
Solution Approach 2:
The patent changes the electromagnetic parameters of the space between the antenna and conductive surfaces by incorporating ferrite materials with specific magnetic permeability properties. This alters the impedance matching and reduces the coupling between the antenna fields and the conductive surfaces, enabling low-profile installation without significant signal degradation
3Power
If conventional antennas are designed with larger dimensions for better radiation performance, then antenna gain improves, but integration with vehicle structure becomes more difficult and aerodynamic performance deteriorates
Solution Approach 1:
The patent transitions from traditional vertical monopole or dipole antenna configurations to a planar, low-profile structure that lies flat against the vehicle surface. The radiating elements are arranged in a two-dimensional plane with complex geometric patterns that provide sufficient radiation area and gain while maintaining a thin profile that integrates seamlessly with vehicle body panels
Solution Approach 2:
The patent divides the antenna into multiple discrete radiating elements with different geometries (e.g., rectangular patches, circular patches, annular rings) that are distributed across the antenna aperture. This segmentation allows each element to contribute to the overall radiation pattern and gain while the individual small elements can be easily manufactured and integrated into the vehicle structure
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 a single antenna to replace multiple conventional antennas, maintaining aerodynamics and design integrity while providing efficient signal transmission and reception across various frequency bands, thus reducing the number of antennas needed and improving integration with vehicle structures.
Implementation Method 1
The antenna comprises a patch of conducting material that is a distance above and parallel to a ground plane... An embodiment of the antenna includes at least one ferrite positioned between the patch and the ground plane
Implementation Method 2
The antenna can be integrated into or otherwise situated on the automobile during manufacturing... having an omnidirectional radiation pattern with vertical polarization
Data Source
AI summary
A low-profile multi-band antenna for telematics applications is described, where the antenna has multiple resonant frequencies. A single feed connects multiple transceivers to the antenna. The antenna has a height less than a centimeter and a surface area of around 60 square centimeters. The resonant frequencies of the antenna are determined by a center sub-patch and additional sub-patches that surround the center sub-patch. Ferrites, placed between the sub-patches and a ground plane, are used for tuning the resonant frequencies.