Motorcycle Antenna Placement for V2V Communication
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Solution Overview
Problem
Conventional two-wheeled motor vehicle antenna configurations are inadequate for effective vehicle-to-vehicle communication, particularly with rearward vehicles due to attenuation and reflection issues caused by the rider or load, limiting communication distances and effectiveness.
Innovation Solution
A two-wheeled motor vehicle design featuring a nondirectional front antenna for road-to-vehicle and vehicle-to-vehicle communication with forward vehicles, combined with a directional rear antenna positioned rearward of the seat to enhance communication distances with rearward vehicles, while minimizing interference from the rider and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nondirectional antenna is disposed forward of the vehicle for road-to-vehicle communication, then communication with roadside units and forward vehicles is improved, but communication distance with rearward vehicles becomes insufficient due to attenuation and reflection by the rider or load
Solution Approach 1:
The patent divides the antenna system into two separate antennas: a front antenna for forward communication and a rear antenna for rearward communication. This segmentation allows each antenna to be optimized for its specific direction, with the rear antenna positioned and configured to achieve longer communication distance with rearward vehicles without being blocked by the rider or load.
Solution Approach 2:
The patent adds a spatial dimension by positioning the rear antenna in a location rearward of the seat, creating a three-dimensional antenna arrangement. This dimensional change allows the rear antenna to transmit and receive electromagnetic waves in a direction away from the rider and load, overcoming the attenuation and reflection problems that limit rearward communication distance.
2Length of moving object
If an antenna is disposed in the rear storage box for vehicle-to-vehicle communication with rearward vehicles, then communication distance with rearward vehicles is improved, but communication with forward vehicles becomes insufficient due to attenuation and reflection by the rider or load
Solution Approach 1:
The patent segments the communication function into two separate antennas positioned at opposite ends of the vehicle. The front antenna handles forward communication while the rear antenna handles rearward communication, eliminating the trade-off where one direction's optimization harms the other direction's performance.
Solution Approach 2:
The patent applies local quality by giving each antenna location-specific characteristics: the front antenna is positioned forward of the vehicle for optimal forward communication, while the rear antenna is positioned rearward of the seat for optimal rearward communication. Each location provides different local conditions (clear forward path vs. clear rearward path away from rider and load) that are exploited to optimize communication in each direction.
3Device complexity
If a single antenna is used for both forward and rearward communication, then device complexity is reduced, but communication effectiveness in both directions is compromised due to interference and attenuation
Solution Approach 1:
The patent applies universality by making both the front and rear antennas capable of performing multiple communication functions (road-to-vehicle and vehicle-to-vehicle communication). This allows the system to maintain versatility while improving reliability in both directions through the dual-antenna 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 enables effective road-to-vehicle and vehicle-to-vehicle communication with both forward and rearward vehicles by optimizing antenna placement and directionality, maintaining a clear electromagnetic wave path and preventing interference from the rider and load.
Implementation Method 1
the front antenna mainly performs road-to-vehicle communication with roadside units and vehicle-to-vehicle communication with preceding vehicles and oncoming vehicles
Implementation Method 2
the rear antenna has a directionality enabling a long communication distance compared with nondirectionality, and has a directionality rearward of the vehicle
Implementation Method 3
communication is made with another vehicle located rearward... becomes short under the influence of attenuation or reflection by the rider or a load located rearward of the antenna
Implementation Method 4
communication is made with another vehicle located rearward... becomes short under the influence of attenuation or reflection by the rider or a load located rearward of the antenna
Data Source
Figure 1
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Figure 3
AI summary
Since a front antenna 33 performs road-to-vehicle communication and vehicle-to-vehicle communication with oncoming vehicles, a nondirectional antenna enables effective communication in communication distances. Vehicle-to-vehicle communication with rearward vehicles by a rear antenna 37 needs long communication distances compared with road-to-vehicle communication and vehicle-to-vehicle communication with oncoming vehicles. The rear antenna 37 can also perform communication effectively with rear vehicles since what is selected is a directional one that can provide longer communication distances than a nondirectional one and that has directionality rearward of the vehicle. The front antenna 33 is disposed forward of a seat 7, and the rear antenna 37 is disposed rearward of the seat 7, which can inhibit an attenuation of electromagnetic waves due to the rider and the like. Consequently, while being capable of performing road-to-vehicle communication effectively, vehicle-to-vehicle communication with rearward vehicles can also be performed effectively.