Vehicle Antenna Isolation Using High-Pass Filtering Near Window Glass
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Solution Overview
Problem
Antennas with different frequency bands placed proximate to each other on vehicles experience degradation in transmission/reception sensitivity, particularly in high-speed, high-capacity communication standards like 4G LTE and 5G.
Innovation Solution
A vehicle antenna device comprising multiple antennas with different frequency bands, where at least one antenna is disposed on or near the window glass and includes a power supply unit connected to a high-pass or low-pass filter to secure isolation between antennas, reducing noise interference and maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas with different frequency bands are placed proximate to each other on the vehicle, then the communication coverage and functionality are improved, but the transmission/reception sensitivity of each antenna is degraded
Solution Approach 1:
A noise removing pattern is introduced as an intermediary element between the first antenna and the second antenna. This pattern acts as a mediator that absorbs or blocks noise generated by the second antenna from reaching the first antenna, thereby preventing interference while allowing both antennas to function in close proximity. The noise removing pattern is specifically designed to address the frequency band differences between the two antennas.
Solution Approach 2:
The space between the two antennas is segmented by introducing the noise removing pattern, which divides the electromagnetic field environment into distinct zones. This segmentation allows each antenna to operate in its own optimized frequency band without mutual interference, effectively separating the noise paths while maintaining physical proximity for space efficiency.
2Area of stationary object
If electronic devices and antenna patterns are placed close to each other on the window glass, then the view through the window glass is maintained, but the antenna operation becomes unstable and antenna gain is lowered
Solution Approach 1:
The noise removing pattern serves as an intermediary between the electronic device and the antenna pattern on the window glass. It absorbs noise generated by the electronic device before the noise can reach and interfere with the antenna operation, thereby maintaining stable antenna performance while allowing close placement on the limited window glass area.
3Device complexity
If antennas are placed close to each other to save space, then the device complexity is reduced, but noise interference between antennas increases
Solution Approach 1:
The noise removing pattern is introduced as a space-efficient intermediary that fits between the two antennas without significantly increasing the overall device footprint. It absorbs or blocks noise from one antenna from reaching the other, effectively reducing noise interference while maintaining the compact antenna arrangement and avoiding substantial increases in device complexity.
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 configuration effectively reduces the degradation of transmission/reception sensitivity between antennas with different frequency bands, ensuring stable communication performance even when placed close to each other.
Implementation Method 1
the second antenna includes a power supply unit to which a high-pass filter is connected
Data Source
AI summary
To provide a vehicle antenna device which includes multiple antennas, the frequency bands of radio waves to be transmitted and received by the multiple antennas being at least partially different from each other, proximate to each other and which can reduce the degradation of the transmission/reception sensitivity of each of the multiple antennas.A vehicle antenna device to be mounted on a vehicle, comprising:a first antenna capable of transmitting and receiving radio waves of a first frequency band; anda second antenna proximate to the first antenna and capable of transmitting and receiving radio waves of a second frequency band including a frequency band higher than the first frequency band,wherein at least one of the first antenna and the second antenna is disposed in or on window glass of the vehicle or in the vicinity of the window glass, andwherein the second antenna includes a power supply unit to which a high-pass filter is connected.