Planar Vehicle Antenna Unit Installation and Transmission Loss
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Solution Overview
Problem
Conventional antenna units for vehicles face challenges in installation at the inner side of vehicle exteriors due to limited space and need for improved mountability and transmission efficiency.
Innovation Solution
A planar antenna unit with a flexible planar antenna, insulating base portions, reinforcing structures, and position fixing components that allow for secure and efficient installation on vehicle exteriors, enabling effective transmission and reception of electric waves while minimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the antenna unit is installed at the inner side of the vehicle exterior to improve mountability, then the ease of installation is improved, but the available installation space is limited and structural stability deteriorates
Solution Approach 1:
The antenna unit is divided into multiple base portions (first base portion and second base portion) that can be independently positioned and fixed. This segmentation allows the antenna unit to adapt to limited installation space while maintaining structural stability through distributed support points on the vehicle exterior inner side.
Solution Approach 2:
The antenna structure transitions from a conventional three-dimensional protruding design to a planar two-dimensional configuration that can be flat-mounted on the inner side of the vehicle exterior. This dimensional change enables installation in previously inaccessible flat spaces without requiring protrusion into the vehicle interior or exterior.
2Strength
If the antenna unit is designed with extended base portions to improve structural rigidity, then the strength is improved, but the device complexity increases
Solution Approach 1:
The first base portion and second base portion are integrally formed as a single unified structure rather than separate components. This merging provides structural rigidity comparable to extended designs while simplifying manufacturing and installation, avoiding the complexity of multiple separate rigid components that would need to be assembled.
Solution Approach 2:
The base portions utilize thin planar structures with integrated positioning protrusions that provide necessary rigidity support without requiring thick or extended geometries. The thin-film-like base portions achieve structural adequacy through strategic geometric features rather than increased material volume.
3Volume of moving object
If the planar antenna is installed close to the vehicle exterior surface to reduce space usage, then the volume is reduced, but the transmission efficiency of electric waves deteriorates
Solution Approach 1:
A dielectric member is introduced as an intermediary substance positioned between the planar antenna and the vehicle exterior. This dielectric layer acts as a mediator that enables the antenna to operate effectively in close proximity to the exterior surface by managing electromagnetic field interactions, reducing transmission loss while maintaining compact installation footprint.
4Ease of manufacture
If the antenna unit uses simple base portions to reduce manufacturing complexity, then the ease of manufacture is improved, but the ability to fix positions deteriorates
Solution Approach 1:
The base portions feature asymmetric positioning protrusions with specific geometric configurations (including inclined surfaces) that provide reliable mechanical engagement with corresponding features on the vehicle exterior. This asymmetric design ensures consistent positioning and fixation reliability while maintaining manufacturing simplicity through single-step molding or forming processes.
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 antenna unit achieves improved mountability and reduced transmission loss, allowing for efficient installation on vehicle interiors without compromising wave transmission, and enhances reliability through reinforcing structures and shielding against electromagnetic noise.
Implementation Method 1
a planar antenna transmitting or receiving the electric waves
Implementation Method 2
a dielectric member provided between the planar antenna and the exterior, and reduces transmission loss of electric waves
Data Source
AI summary
An antenna unit includes a planar antenna portion, a planar coaxial line portion, and position fixing portions. The planar antenna portion includes planar antennas installed at the inner side of an exterior (for example, a roof panel) of a vehicle, the exterior allowing electric waves to be transmitted therethrough, and a first base portion supporting the planar antennas. The planar coaxial line portion includes second wiring patterns connected to the planar antennas and a second base portion connected to the first base portion and supporting the second wiring patterns. The position fixing portions fix the positions of the planar antenna portion and the planar coaxial line portion onto the exterior.