Heavy Duty Uhf 800mhz Radio Am/Fm Car Antenna
- Transportation:
- Ocean, Land, Air, Express, Others
- Port:
- SHENZHEN, HONGKONG, GUANGZHOU
Quantity:
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Basic Info
| Place of Origin: | CHINA |
|---|---|
| Productivity: | 2000000 |
| Supply Ability: | 2000000 |
| Certificate: | iso |
| Transportation: | Ocean,Land,Air,Express,Others |
| Port: | SHENZHEN,HONGKONG,GUANGZHOU |
Product Description
Product Description
Propagation characteristics of sky waves: FM/AM broadcast signals mainly propagate through spatial waves (direct waves+reflected waves). As the highest point of the whole vehicle (about 1.5-2 meters above the ground), the straight-line distance from the broadcast transmission tower (usually 50-300 meters high) is shortened, and the blocking probability of ground obstacles (such as buildings and trees) is reduced.
Minimization of car body shielding: if the Car Antenna is installed on the side or bottom of the car body, it is easy to be shielded by the metal structure of the car body (such as the door and chassis) during driving; The roof is in the position with the least "signal blind area", especially in the urban high-rise environment, the signal reception stability of the roof Car Radio Antenna is more than 30% higher than that of the bottom installation.
Symmetrical layout of the roof: the center of the roof is close to the geometric symmetry axis of the vehicle, which is convenient for arranging omnidirectional FM AM Antenna (such as rod antennas and spiral antennas) to realize 360-degree uniform radiation/reception and avoid signal attenuation caused by vehicle steering. For example, the spiral polarized antenna can form a horizontal omni-directional coverage on the roof, but when installed on the side, it may produce a "lobe blind area" due to the metal reflection of the car body.
Multi-path signal optimization: the height of the roof enables the antenna to receive direct waves and ground reflected waves at the same time, and the intensity is improved through signal synthesis. The measured data show that the multipath fading effect of the roof antenna is 15dB lower than that of the door installation, especially in the strong reflection scene such as tunnel exit, the signal recovery speed is 20% faster.
Interference suppression of electronic equipment: The engine, instrument panel, motor and other equipment in the car will produce broadband electromagnetic noise (mainly concentrated in the 0.1-100MHz frequency band, overlapping with FM/AM frequency band). The distance between the antenna on the roof and the electronic equipment in the car is ≥ 1.5m, and the interference intensity can be reduced to 1/10 (according to the electromagnetic radiation inverse square law) through spatial isolation.
Shielding effect of metal car body: The antenna on the car roof is located above the metal car roof, and the car body itself can be used as an electromagnetic shielding layer to prevent the low-frequency interference (such as spark of motor brush) in the car from spreading to the antenna direction, while the antenna installed in the car (such as rear windshield) requires additional filter circuits, which is more costly and complicated.
Low wind resistance design: Modern roof antennas mostly adopt the streamlined structure of shark fin (wind resistance coefficient ≤0.03), and the wind noise at high speed is ≤58dB, which is 8% lower than that of the traditional rod antenna, and has little impact on the fuel consumption of the whole vehicle (wind resistance contribution < 1%).
Collision safety considerations: the position of the roof antenna is higher than the contact range of pedestrians, and the retractable design (such as some high-end models) can automatically retract in the event of collision, reducing the risk of injury to pedestrians, which meets the safety standards of the European Union such as ECE R127.
Appearance integration: The roof antenna can be integrated with the luggage rack, roof trim and other components, or adopt glass printing technology (such as metal coating on the front windshield) to realize "invisible" signal reception and improve the appearance simplicity of the whole vehicle, especially favored by new energy vehicles.
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