Transparent Vehicle Glass Antenna Layout for MIMO Isolation
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Solution Overview
Problem
Current vehicle antenna arrangements fail to meet the high antenna isolation degree required for multiband wideband communication, and the metal vehicle body shields electromagnetic signals, affecting performance.
Innovation Solution
A vehicle antenna assembly with a transparent antenna unit comprising a first radiation unit and a grounded second radiation unit, attached to an antenna base film, which is designed to be integrated into vehicle glass, ensuring large antenna spacing and impedance matching, thereby improving radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vehicle antennas are arranged in a multi-antenna array to increase channel capacity and communication rate, then communication performance is improved, but antenna isolation degree between various antennas deteriorates
Solution Approach 1:
The patent integrates antennas into the vehicle glass structure, transitioning from traditional metal body mounting to a glass substrate platform. This dimensional change in mounting location provides better spatial separation and isolation between multiple antennas while maintaining compact vehicle design, directly addressing the isolation degree problem in multi-antenna arrays
2Device complexity
If traditional vehicle antenna arrangement is used, then device complexity is reduced, but antenna isolation degree requirement for MIMO technology is not met
Solution Approach 1:
The vehicle glass serves multiple functions: it acts as both the transparent protective component of the vehicle and as the substrate for mounting communication antennas. This multi-functionality integrates the antenna support structure into the existing glass assembly, avoiding additional complex mounting structures while achieving the required antenna isolation degree for MIMO technology
3Strength
If metal vehicle body is used, then structural strength is improved, but electromagnetic signal shielding effect increases
Solution Approach 1:
The patent introduces glass as an intermediary material between the metal vehicle body and the antenna elements. The glass substrate provides a non-conductive platform that prevents the metal body from shielding electromagnetic signals, while still allowing the antenna to be securely mounted. This intermediary layer eliminates the harmful shielding effect without compromising the structural strength provided by the metal body
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 solution effectively addresses the isolation issue between antennas and minimizes signal shielding, enhancing radiation efficiency and performance.
Implementation Method 1
a first radiation unit, configured to receive and transmit a radio frequency signal
Implementation Method 2
The second radiation unit is grounded and is configured to tune a resonant frequency of the first radiation unit
Implementation Method 3
transmittance of both the first radiation unit and the second radiation unit is greater than 80%
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
Disclosed in the present application are an antenna assembly for a vehicle, and a glass assembly and a vehicle. The antenna assembly for a vehicle comprises an antenna base film and a transparent antenna unit. The transparent antenna unit is attached to one side of the antenna base film, and the transparent antenna unit comprises: a first radiation unit, which is used for receiving and transmitting a radio frequency signal; and a second radiation unit, which is arranged spaced apart from the first radiation unit, wherein the second radiation unit is grounded and is used for tuning the resonant frequency of the first radiation unit, such that the resonant frequency meets an impedance matching requirement. The antenna assembly for a vehicle in the present solution can be attached to glass and can also be arranged in a glass interlayer. An antenna design area is large, and the physical distance between antennas is large, such that the problem of the isolation degree between the antennas can be fundamentally solved. In addition, the antennas are designed on vehicle glass, such that the influence of shielding of metal of a vehicle body on the performance of the antennas can be effectively avoided, thereby greatly improving the radiation efficiency of the antennas.