The shark fins on the car roof are car antennas. It is commonly seen on many BMW cars. This can compensate for many of the shortcomings of traditional antennas. It's prettier and looks more dynamic. Therefore, many car manufacturers imitate and install shark fin antennas on their cars. So, what is the “shark fin” on the roof of the car for?
First, increase the signal. For a car that runs in the city all year round, this may not be noticeable, but if you go to a remote location, there will be a big difference between a car with a shaped antenna shark fin and a car without an antenna. Shark fin antenna. Big difference. Without it, listening to the radio in remote locations can seem frustrating, which is very inconvenient. The shark fin antenna can amplify the signal and makelistening to various broadcasts very smoothly.
Second, release the static electricity from the car body. Static electricity is very common in cars, especially during dry seasons like winter when it is easy to generate excessive static electricity. If the static electricity stays in the car for a long time, it may be electrocuted when the door is opened. Refueling at a gas station can also pose a safety risk. In the past, in order to release static electricity, people attached an iron chain to the tail of the exhaust pipe. Today, with the addition of a shark fin antenna, it no longer looks very atmospheric and beautiful.
The third function is that it can intercept emitted radio waves. In addition to intercepting these radio waves, shark fin antennas can also transmit them to others automotive devices requiring various radio waves. It can be said to be very useful. It is worth mentioning that some car owners believe that the shark fin antenna can reduce the resistance of the body, thereby reducing fuel consumption. In fact, from a design point of view, it plays such a role, but it is very limited in reducing fuel consumption. According to data obtained through expert experiments, installing a shark fin antenna can reduce fuel consumption by about 3% at high speeds. In actual use, the shark fin antenna does not seem to have much impact on reducing fuel consumption.
Great! Why do car antennas have so many functions?
Take a minute to understand the shark fin on the car body
Receiving signals, there is a disposignal receiving device inside the "shark fin", which has powerful anti-interference ability and resistant to radio waves. The interference is low, which not only improves the communication signal, but also improves the stability of the communication signal. In addition to the basic function of the final signal, the shark fin is also responsible for reception. communications, GSM network signals, GPS positioning signals, various multimedia functional services, including navigation, in-vehicle positioning.
Release static electricity. In addition to receiving signals, shark fins also have the function of releasing static electricity which accumulates in the "shark fins" through conductive wires and is then released into space, eliminating the 'static electricity. static electricity generated by the car and spoil traffic. According to the principles of physicsue, the car will encounter resistance when driving. The faster the speed, the greater the resistance. If there are no shark fins, a small vortex will form above. car.The shaped airflow leads to increased wind resistance and noise. With the presence of shark fins, the airflow will be divided, thereby reducing wind resistance, which can effectively reduce fuel consumption and noise.
To avoid rear-end collisions, some “shark fins” are equipped with LED lights, and some even use the principle of solar energy. They will flash alternately at night, which can remind the attention of vehicles behind, in particular. in extreme weather. It has a good effect.
The antenna can improve the signal
When driving, if we often drive in the city, we may not feel it so obvious , but if so. The vehicle is drivenIn a slightly remote area, the enhancement effect of the antenna will be obvious. “In addition, it can also intercept high-frequency radio waves, transmit them to vehicle-mounted equipment, and then readjust the vehicle-mounted radio waves. ?In addition to transmitting and receiving signals, the most important function of the antenna is to prevent rear-end collisions.
Car antennas can prevent rear-end collisions
Some shark fins are also equipped with LED lights, and some even use the principle of solar energy. At night, this antenna flashes. alternately. It also has a small function, that is, it can remind the attention of vehicles behind it, especially in bad weather, such as thick fog or heavy rain. In weather with ultra low visibility it can also. achieve such a special effect. We must also take great care of it when we clet's wave.
The antenna can reduce the resistance of the car
When we drive, if we drive at high speed, a vortex will generally form at the rear of the car, which can easily increase resistance. of the car. However, the shark fin antenna on the roof of the car can be better cut off before the airflow forms a vortex, which can effectively reduce the resistance of the car. This method can effectively reduce fuel consumption. “The antenna” has one last important function, which is to eliminate static electricity. “When the weather is dry, cars can easily generate static electricity, but the car itself has no other way to discharge it. “Therefore, only a few large trucks will drag an iron chain on the back of the truck to discharge electricity.
The role of hidden antennas
In fact, on the auto parts marketthere is also a hidden antenna. It is so named because it is completely hidden within the body of the car. usually hidden. It's on the roof of the car, or maybe in the trunk lid, spoiler, bumper, etc. It's a bit difficult to find. In addition to its radio function, it can also be used for composite plural media types. “At the same time, in today's market, there is the latest WiFi security system designed with two antennas, one antenna is used to transmit signals and one antenna is used to receive signals.
The antenna can release electricity
The antenna is a good thing that can improve the signal and release the static electricity accumulated in the car shell, so that it can effectively protect the safety of passengers and the vehicle. safety of the automobile circuit. "The function of shark fins is to intercept thes transmitted radio waves. The car antenna can receive the radio waves.The high frequency radio waves from the station, so this antenna can also receive the radio. Don't underestimate this antenna. In fact, it is particularly useful. “His shadow is visible on many vehicles.
This article is from the author of Autohome Chejiahao and does not represent the views and positions of Autohome.