Omnidirectional antenna
Omnidirectional antennas, that is, 360° uniform radiation on the horizontal pattern, that is, the so-called non-directional, and a beam with a certain width on the vertical pattern. In general, the smaller the lobe width, The bigger the gain. The omnidirectional antenna is generally used in the station type of the suburban county system in the mobile communication system, and the coverage is large.
Directional antenna
Directional antennas are radiated in a certain angle range on the horizontal pattern, which is commonly referred to as directional. As with omnidirectional antennas, the smaller the lobe width, the greater the gain. Directional antennas are generally used in communication systems in environments with long communication distances, small coverage, high target density and high frequency utilization.
The difference between a directional antenna and an omnidirectional antenna
The omnidirectional antenna will transmit signals in all directions, and the signals can be received from front, back, left and right. The directional antenna is like covering a bowl-shaped reflective surface behind the antenna. The signal can only be transmitted to the front, and the signal sent to the back is blocked and reflected by the reflective surface. to the front, strengthening the signal strength ahead. The main radiation range of a directional antenna is like an inverted, incomplete cone
For an omnidirectional antenna, in general, the smaller the lobe width, the greater the gain. Omnidirectional antennas are generally used in communication systems with short distances, large coverage and low prices. The gain is generally below 9dB. The radiation range of an omnidirectional antenna is comparable to that of an apple.
How to buy
If multiple sites need to be met, and these sites are distributed in different directions of the AP, omnidirectional antennas are required; if they are concentrated in one direction, it is recommended to use directional antennas; in addition, it is also necessary to consider whether the joint form of the antenna matches the AP, the antenna Whether the gain size, etc. meet your needs.
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