The role of car antenna is:
1, mainly used to receive external signals, car owners can listen to the radio in the car, relying on the role of the antenna;
2, there are some special role, the role of the antenna on the police car is to receive mobile radio, especially the police special band information;
3, the car antenna is also a kind of electrostatic discharge, mainly car shell accumulated electrostatic discharge, in order to protect the passenger safety and body circuit.
Car antenna can be divided into car built-in antenna and external antenna, according to different uses of the car also have to install other antennas, such as buses have DVB-T antenna, car TV antenna.
Second, the type of car antenna and advantages and disadvantages
1, the old car will use the telescopic antenna: similar to the former radio can be extended and shorten the kind of antenna, but now the car basically no longer use this kind of antenna.
2、Whip antenna: this kind of antenna can't be retracted, now the car is used more. The appearance is good, but the wind noise is relatively large.
The above two antenna advantages: in some more remote places.
Disadvantages: the antenna is too long, not only affects the beauty, but also increases the wind resistance of the car in the process of driving, driving through the tunnel or some relatively low places, it is possible to touch.
3, car glass antenna: is the antenna embedded in the front windshield or rear windshield inside, so generally installed glass antenna car, is not visible behind the car this small tail. Glass antenna is now also more mainstream configuration. But the glass antenna in technology and there are several forms: glass embedded fine wire antenna, printed on the surface of the glass antenna, transparent conductive film antenna and so on. Advantages: Because the glass antenna meets the requirements of automotive mechanics, aesthetics and aerodynamics, many manufacturers will choose this. Disadvantages: the reception of the signal has an impact, relative to the other two antennas, the signal of this appears to be relatively weak, in addition, if the windshield is broken, you can only replace the original car antenna glass, the price will inevitably be higher.
4, shark fin antenna: is currently more popular form of an antenna, the main reason is beautiful, enhance the grade.