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The antenna isDirectionalHigh-gain antenna, suitable for: 2.4G SMA interface equipment, widely used for wireless network card long-distance reception, wireless router AP signal transmission, point-to-point long-distance bridge, relay and other equipment.
The difference between omnidirectional antenna and directional antenna
Antennas have different radiation or receiving capabilities in different directions in space, which is the directivity of the antenna. Depending on the directivity, there are two types of antennas: omnidirectional and directional. The following mainly explains the differences between them and related parameters.
Directional antenna :
Directional antennas show a certain angular range of radiation on the horizontal pattern, which is usually said to have directivity. Like the omnidirectional antenna, the smaller the lobe width, the greater the gain. Directional antennas are generally used in communication systems where the communication distance is long, the coverage area is small, the target density is high, and the frequency utilization rate is high.
We can also think about the relationship between omnidirectional antennas and directional antennas in this way: omnidirectional antennas emit signals in all directions, and can receive signals from the front, back, left, and right. The directional antenna is like a strong reflective surface behind the antenna. The signal can only be transmitted to the front, and the signal to the back is blocked by the reflective surface and reflected to the front, which strengthens the signal strength in the front. The following figure shows the signal radiation pattern of the directional antenna.
Omnidirectional antenna:
An omnidirectional antenna, which is 360 on the horizontal pattern°They all radiate uniformly, which is called non-directionality. In general, the smaller the lobe width, the greater the gain. Omnidirectional antennas are generally used in communication systems with short distances, large coverage areas and low prices. The gain is generally below 9dB. The figure below shows the signal radiation pattern of an omnidirectional antenna.Through the above, we can visually realize what is an omnidirectional antenna and what is a directional antenna, so what should be paid attention to in practical application?Antenna purchase:If you need to meet multiple sites, and these sites are distributed in different directions of the AP, you need to use omnidirectional antennas; if they are concentrated in one direction, it is recommended to use a directional antenna; in addition, consider whether the antenna joint form matches the AP and the antenna Whether the gain of the antenna meets your needs; for outdoor antennas, lightning protection equipment needs to be added between the antenna and the wireless AP; for directional antennas, pay attention to the direction that the front of the antenna faces the remote site; the antenna should be installed as high as possible The position, the line of sight between the antenna and the site as much as possible(Visible to the naked eye, avoid obstacles in the middle).