October 16, 2023
Source: Tengyuan Zhituo
The wireless bridge must be used in conjunction with an antenna. There are two common types of wireless bridges and antennas, one external and one built-in.
As name implies, built-in antenna is mounted inside body of wireless bridge and is not visible on surface. The built-in antenna is usually small and can be integrated with bridge. The bridge and antenna are integrated, which is convenient, compact and easy to carry. The disadvantage is that transmission distance is relatively short. The transmission distance of a wireless bridge using built-in antenna can usually not exceed 10 kilometers .
The external antenna comes in several different shapes, which may be called by different names depending on purpose.
For example, to distinguish by direction: there are directional antennas and omnidirectional antennas.
Directional antenna transmission model
Directional antennas transmit microwave signals at fixed angles. Standard antenna angles are 30, 60, 90 and 120 degrees. The angle of inclination of a directional antenna is limited, but because of this, microwave signal transmitted through it tends to be transmitted farther and more stable. The disadvantage is that antenna must be tuned for good microwave transmission. It is mainly used for point-to-point, multipoint and relay transmission.
Full line antenna
An omnidirectional antenna transmits or receives microwave signals in all directions. The shape of its microwave radiation is a bit like an "apple". Directly above and directly below an omnidirectional antenna, there are fewer microwave signals. You can tell it's dark. under lamp. But its advantage is that it can carry out wireless microwave transmission without alignment angle. The disadvantage is that transmission distance is short. It is mainly used for point-to-multipoint transmission and relay communications.
Model of microwave radiation of a full-wire antenna
In addition, antenna is also divided into 2.4G and 5.8G frequencies. A wireless bridge of corresponding frequency can only be used with an antenna of same frequency. For example, if a 2.4G wireless bridge is used, a 2.4G antenna must be used, and vice versa.
Antennas can also be divided into single polarization and dual polarization antennas:
Single polarized antennas can only be used to transmit or receive microwave signals. Single polarization antennas are mainly used to transmit or receive point-to-point and point-to-multipoint wireless signals, while dual polarization antennas are used to simultaneously transmit and receive microwave signals, often used in wireless microwave signal relay.
Which type of antenna to use should generally be judged according to local situation. Built-in, external, directional, omnidirectional, unipolar, bipolar, each has its own meaning, and users do not need to worry too much When designing a wireless solution, supplier's professional technicians will decide which antenna to use according to user's actual needs, and user only needs to know this basic knowledge.
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