What is the "shark fin" on the roof?
The shark fin on the roof is actually the antenna of the car.
As for the car antenna, I believe that the traditional antenna appears in your mind, that is, the rod antenna similar to the traditional old TV antenna. Haha, now you have exposed your age.
This shark fin antenna was actually invented by an Australian aircraft maintenance engineer. He first transplanted the spoiler on the plane to the car and obtained a patent.
Later, BMW bought it and combined it with the function of receiving GPS/GSM signals, which was used in a series of BMW models.
Shark fin antenna is elegant in appearance and fully functional.
Results This shark fin antenna not only overcomes many shortcomings of the traditional antenna, but also makes the car look more fashionable and sporty because of its generous appearance, complete functions and integration with the whole car.
Therefore, it is favored by consumers, so all kinds of high-end cars on the market adopt this kind of shark fin antenna.
Some shark fins on the roof of the car were later pasted as decoration.
In particular, there are some shark fins on the top of the car, which were later attached as decorations.
The real shark fin antenna has a connector, and the built-in antenna and ground wire are connected with the car body.
What does the shark fin antenna do?
Some friends may think, "shark fin is an antenna, but I don't listen to the radio at all now, so why does it have to have shark fin in the car?"
Because it can not only receive signals from radio stations, but also has some other functions.
1, receiving signal
The basic function of shark fin antenna is antenna, which can receive radio signals, so it receives the signals we usually listen to on the radio.
At the same time, it is also responsible for receiving GSM signals of communication and network, as well as GPS signals of positioning, serving vehicle positioning including navigation and various multimedia functions.
It can be said that it integrates various signals including AM, FM, GPS, GSM and so on, and can support all functions of ordinary antenna and other automotive electronic functions.
Step 2 release static electricity
Shark fin antenna, which is actually an electrostatic discharger.
According to the paper "Improved Design of Automobile Fin Antenna" in Shandong Industrial Technology magazine:
Shark-fin car antenna makes full use of the characteristics of electrons, guiding electrostatic electrons to the top of shark-fin antenna and releasing them. No matter where the shark-fin antenna is installed in the car, the electrostatic effect can be reduced.
How to say it specifically? That is to say, in winter or very dry autumn, it is easy to find static electricity on the car body. If it is not released, it will not only knock us gently, but also bring terrible consequences at the gas station.
As you can see, there is a chain dragging on the ground at the tail of the tanker. In fact, its function is to release static electricity, and shark fin antenna has this function.
Installing the shark fin antenna on the top or tail of the car can let the static electricity on the car be released into the air through it.
Therefore, the shark fin antenna is an electrostatic discharger.
3. Turbulence effect
When a car is driving, it will encounter air resistance. The faster you drive, the greater the resistance.
If the antenna in your car only exists alone and there is no "shark fin" package, it will form a small vortex airflow, which will increase your wind resistance and noise accordingly.
However, it is precisely because of the unique tip shape of shark fin that it can cut and divert airflow and avoid vortex airflow, thus reducing wind resistance, saving fuel and reducing noise.
Although many cars will be equipped with special spoilers, shark fins can also play a certain role as spoilers.
4. Rear-end collision prevention function
Some shark fins are also equipped with LED lights, and some even use the principle of solar energy to flash alternately at night to remind the vehicles behind them to pay attention.
Especially in extreme weather, such as fog or rainy weather with low visibility, it can play a very good role.
Summary:
Shark fin antenna has a very fashionable, dynamic and dazzling appearance. It also integrates various powerful automotive electronic functions such as FM, GPS and GSM, and truly achieves the perfect combination of fashion and function.
In addition, it also has the warning function of releasing static electricity, disturbing current and preventing rear-end collision.