Vehicle Antenna Array Spacing for Stable Reception Under Reflected Waves
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Solution Overview
Problem
Existing vehicle-to-vehicle communication systems face challenges in maintaining stable communication due to periodic fluctuations in signal reception levels caused by interference from multiple reflected waves in line-of-sight environments, leading to null points or low reception levels.
Innovation Solution
An antenna array configuration for vehicle-to-vehicle communication that includes multiple antennas shifted by odd multiples of the half-period of the maximum and minimum fluctuation periods of received radio waves, optimizing the spacing to prevent null points and enhance reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are arranged for spatial diversity, then communication reliability is improved, but reception level fluctuation and null points occur due to reflected wave interference
Solution Approach 1:
The patent changes the spatial arrangement parameters of antennas by positioning them at odd multiple half-period intervals of the fluctuation period. This parameter optimization transforms the antenna spacing from conventional fixed distances to dynamically calculated positions based on the fluctuation characteristics of reflected waves, thereby resolving the contradiction between maintaining spatial diversity and avoiding null points.
Solution Approach 2:
The patent performs preliminary identification of the fluctuation period of received signals before arranging the antennas. By pre-determining the characteristics of reflected wave interference and calculating the appropriate antenna spacing in advance, the system proactively prevents null points from occurring rather than reacting to them afterward.
2Stability of the object's composition
If antenna spacing is increased to avoid null points, then reception stability is improved, but antenna array size and device complexity increase
Solution Approach 1:
The patent optimizes antenna spacing parameters to odd multiple half-period intervals, which provides the necessary separation to avoid null points while minimizing the overall antenna array size. This parameter optimization achieves reception stability without excessive increases in device complexity.
Solution Approach 2:
The patent divides the antenna array into multiple antennas positioned at specific intervals rather than using a single large spacing. This segmentation allows the system to achieve stability through distributed positioning at manageable distances, reducing overall device complexity while maintaining reception stability.
3Device complexity
If conventional antenna spacing is used, then device complexity is reduced, but communication fails due to null points in reflected wave environments
Solution Approach 1:
The patent modifies the antenna spacing parameter from conventional fixed values to odd multiple half-period intervals based on signal fluctuation characteristics. This parameter change maintains relatively simple device complexity while dramatically improving communication reliability by preventing null points in reflected wave environments.
4Object-affected harmful factors
If antennas are positioned to avoid reflected wave interference, then reception quality is improved, but the system becomes less adaptable to different environments
Solution Approach 1:
The patent employs a dynamic approach by identifying the fluctuation period specific to each environment and adjusting antenna positions accordingly. Rather than using a fixed arrangement, the system adapts its configuration based on the actual reflected wave characteristics of the operating environment, thereby maintaining high reception quality across diverse settings.
Solution Approach 2:
The patent changes the antenna positioning parameters based on environment-specific fluctuation period measurements. By recalibrating the odd multiple half-period intervals according to actual environmental conditions, the system maintains optimal reception quality while adapting to different operational contexts.
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 proposed antenna array configuration effectively stabilizes reception by preventing null points and improving signal quality, ensuring consistent communication performance in diverse environments.
Implementation Method 1
periodic fluctuations in signal reception levels caused by interference from multiple reflected waves
Implementation Method 2
interference from multiple reflected waves in line-of-sight environments
Data Source
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AI summary
Provided is an antenna apparatus mounted on a movable object, the antenna apparatus including an antenna array including: a plurality of first antennas which are arranged by being shifted by a distance equivalent to an odd multiple of a half period of a maximum fluctuation period of a radio wave having a longest fluctuation period among a plurality of radio waves received from an antenna of a communication partner; and a plurality of second antennas which are respectively arranged by being shifted with respect to the plurality of first antennas by a distance equivalent to an odd multiple of a half period of a minimum fluctuation period of a radio wave having a shortest fluctuation period among the plurality of radio waves.