Omnidirectional antenna:
An omnidirectional antenna, that is, shows uniform radiation at 360° on the horizontal pattern, which is commonly referred to as non-directional. 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.
The radiation range of the omnidirectional antenna is more like an apple
Omnidirectional antenna:
An omnidirectional antenna, that is, shows uniform radiation at 360° on the horizontal pattern, which is commonly referred to as non-directional. 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.
Directional antenna :
Directional antennas show a certain angular range of radiation on the horizontal pattern, which is called directional. 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 will transmit signals in all directions, and the signals can be received 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.
The main radiation range of the directional antenna is like an inverted, incomplete cone
Through the above, we can vividly realize what is an omnidirectional antenna and what is a directional antenna, so what should we pay attention to in practical application?
If you need to purchase antennas for 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 directional antennas; in addition, consider whether the antenna joint form is compatible Whether AP matching and antenna gain size meet your needs;
Antenna installation 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, between the antenna and the site as much as possible Meet the visual distance (visible to the naked eye, avoid obstacles in the middle).
· Common antenna gain: whip antenna 6-9dBi, GSM base station uses Yagi antenna 15-17dBi, parabolic directional antenna can easily achieve 24dBi.
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