What is the purpose of the antenna on a car?
1 Answers
Car antennas are primarily used on vehicles to receive external signals, serving as tools for external communication and receiving radio wave information. Below is more information about car antennas: 1. Car antennas, also known as vehicle-mounted antennas, are generally used for the car's radio and broadcasting stations. They can be categorized into built-in and external antennas. However, depending on the vehicle's purpose, other types of antennas may be installed. For example, buses may have DVB-T antennas or onboard TV antennas, while logistics vehicles and taxis may be equipped with GSM antennas or GPS satellite antennas. Radio and broadcasting antennas mainly include AM/FM antennas, soft PCB digital antennas, and AM/FM/TV antennas. Depending on their function and purpose, the frequency of the antennas used varies. 2. In terms of structure, vehicle-mounted antennas can be shortened type, quarter-wavelength, center-loaded type, five-eighths wavelength, or double half-wavelength antennas. Theoretically, their efficiency increases in this order, and the length of antennas operating in the same frequency band also increases accordingly. Due to the vehicle's height limitations and the wind resistance caused by excessively long antennas during high-speed travel, as well as issues when passing under bridges or entering underground parking lots, vehicle antennas are not necessarily better if longer. Generally, car antennas should not exceed 70 cm, and antennas for vans should be even shorter. Shortened antennas are compact and, although they have lower gain, are suitable for situations where antenna concealment is required.
