Leaky Coaxial Cable Antenna Placement for Vehicle Body Energy Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-cabin communication systems face challenges in maintaining stable wireless communication between vehicles and portable terminals while minimizing power consumption, particularly due to energy loss when electromagnetic waves interact with steel vehicle bodies.
Innovation Solution
The use of a leaky coaxial cable as an antenna, disposed at a predetermined distance corresponding to an integer multiple of the half-wavelength of the electromagnetic wave from the steel plate, to suppress energy loss and power consumption by forming nodes or antinodes at specific locations, ensuring efficient electromagnetic wave propagation and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leaky coaxial cable is used as an antenna for wireless communication in a vehicle, then wireless communication capability is provided, but energy loss occurs when electromagnetic waves interact with the steel vehicle body
Solution Approach 1:
The patent applies parameter changes by precisely controlling the installation distance of the leaky coaxial cable from the steel body to be an integer multiple of half-wavelengths. This parameter optimization creates standing wave patterns with nodes at the steel body interface, minimizing electromagnetic energy loss through the conductive steel structure while maintaining effective wireless communication coverage in the cabin space.
Solution Approach 2:
The patent converts the potentially harmful effect of electromagnetic wave interaction with the steel body (which causes energy loss) into a beneficial configuration. By positioning the antenna at specific distances that create standing wave nodes at the steel interface, the harmful energy dissipation is minimized, and the steel body's presence is effectively utilized as part of the overall electromagnetic field structure.
2Volume of moving object
If the leaky coaxial cable is disposed closer to the steel body to save space, then device compactness is improved, but energy loss increases due to electromagnetic wave interaction with the steel plate
Solution Approach 1:
The patent resolves this spatial-energy tradeoff by identifying specific distance parameters (integer multiples of half-wavelengths) that simultaneously achieve compact installation while minimizing energy loss. These optimized parameters allow the antenna to be positioned as close as possible to the steel body without causing excessive energy dissipation, effectively breaking the traditional tradeoff relationship.
3Loss of energy
If the leaky coaxial cable is disposed at a distance from the steel body, then energy loss is reduced, but device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent simplifies the positioning complexity by providing clear design guidelines: the distance from the steel body should be an integer multiple of half-wavelengths of the operating frequency. This parameter specification transforms a potentially complex positioning problem into a straightforward design rule, making implementation easier while achieving optimal energy efficiency.
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 stabilizes communication states and reduces power consumption by minimizing energy loss when electromagnetic waves interact with the steel vehicle body, allowing for effective wireless communication with portable terminals carried by occupants.
Implementation Method 1
a leaky coaxial cable that outputs an electromagnetic wave having a predetermined wavelength according to a command from the vehicular device
Implementation Method 2
The gap between the leaky coaxial cable and the steel plate has a predetermined distance corresponding to an integer multiple of the half-wavelength of the electromagnetic wave output from the leaky coaxial cable
Data Source
AI summary
An in-cabin communication system performs wireless communication between a vehicle and a portable terminal carried by an occupant. The in-cabin communication system includes: a vehicular device mounted to the vehicle; and a leaky coaxial cable that is connected to the vehicular device, and that outputs an electromagnetic wave having a predetermined wavelength according to a command from the vehicular device. The leaky coaxial cable is disposed inside a steel plate of a body of the vehicle. The leaky coaxial cable is disposed at a predetermined distance, which corresponds to an integer multiple of a half-wavelength of the predetermined wavelength, from the steel plate.