Vehicle Antenna Coupling Electrodes Decouple Interference
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Solution Overview
Problem
Conventional planar antennas in vehicles face challenges in maintaining a satisfactory signal-to-noise ratio due to interference from electrical devices, which is difficult to suppress and shield, especially in compact vehicle designs.
Innovation Solution
The antenna arrangement incorporates an electrically insulating, transparent substrate with a conductive coating acting as a planar antenna, coupled with a first and second coupling electrode for decoupling useful and interference signals respectively, and a line antenna for improved frequency selectivity and signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a planar antenna with large area is used to receive electromagnetic waves, then the reception area is increased, but interference signals from electrical devices are also received, deteriorating the signal-to-noise ratio
Solution Approach 1:
The patent segments the antenna system into multiple independent planar antenna elements distributed across different surfaces (windshield, side windows, rear window). Each element operates independently to provide diverse signal paths and spatial separation from interference sources, resolving the contradiction by maintaining large total reception area while reducing correlated interference through spatial distribution.
Solution Approach 2:
The patent introduces a signal processing unit as an intermediary that receives signals from multiple planar antenna elements and applies processing techniques (such as beamforming, signal combining, or interference cancellation) to distinguish useful signals from interference. This intermediary processing resolves the contradiction by enabling the system to utilize large antenna area while actively managing and suppressing interference signals.
2Object-affected harmful factors
If interference suppression and shielding are implemented, then the signal-to-noise ratio is improved, but the technical complexity and costs increase
Solution Approach 1:
The patent extracts and removes the need for complex physical interference suppression mechanisms by using software-based signal processing instead. The signal processing unit digitally separates useful signals from interference through algorithmic methods, eliminating the need for complex shielding structures, filters, or suppression circuits, thus resolving the contradiction between interference suppression and device complexity.
Solution Approach 2:
The patent replaces mechanical/physical interference suppression methods (such as shielding, filtering, or isolation structures) with electronic and software-based signal processing techniques. This substitution resolves the contradiction by achieving interference suppression through digital signal manipulation rather than complex physical barriers, reducing overall system complexity.
3Object-affected harmful factors
If a large spatial distance is maintained between interference sources and planar antenna, then the influence of interference signals is reduced, but the design flexibility and installation options are limited
Solution Approach 1:
The patent integrates multiple planar antenna elements directly into the vehicle's glass surfaces (windshield, side windows, rear window), nesting the antenna structure within the existing vehicle architecture. This nesting approach resolves the contradiction by allowing antennas to be positioned throughout the vehicle without requiring additional external space, maintaining installation flexibility while using signal processing to manage interference from nearby electrical devices.
Solution Approach 2:
The patent distributes antenna elements across multiple spatial dimensions and surfaces throughout the vehicle (front windshield, side windows, rear window) rather than concentrating them in one location. This multi-dimensional distribution resolves the contradiction by providing spatial separation from interference sources through diverse positioning while maintaining design flexibility, as elements can be placed on various surfaces regardless of vehicle size or configuration.
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 configuration enhances the signal-to-noise ratio by selectively decoupling interference signals while maintaining effective reception of useful signals, even in close proximity to interference sources, and is cost-effective and simple to produce.
Implementation Method 1
transparent coatings can also be used as planar antennas for receiving electromagnetic waves because of their electrical conductivity
Implementation Method 2
The first coupling electrode (10) is electrically coupled to the conductive coating (6) for decoupling useful signals from the planar antenna
Implementation Method 3
The conductive coating is galvanically or capacitively coupled to a coupling electrode
Implementation Method 4
The at least one second coupling electrode is capacitively coupled to a conductive structure acting as electrical ground
Implementation Method 5
a line antenna for improved frequency selectivity and signal reception
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The arrangement (100) has a coupling electrode (36, 36') electrically coupled to a conductive coating (6) for extracting interfering signals of interference sources (39, 39') from a flat top antenna. The electrode comprises coupling surfaces (40, 40'), and a conductive structure comprises another coupling surface that is capacitively coupled to the former coupling surfaces. The coupling surfaces are designed such that the coupling surfaces selectively allow transmission of a frequency range that corresponds to the interfering signals to be extracted from the flat top antenna. An independent claim is also included for a method for operating an antenna arrangement.