3G antenna antennas are divided into: 1. omnidirectional antenna 2. directional antenna 3. mechanical antenna 4. electronically adjustable antenna 5. dual-polarized antenna. The following mainly introduces the directional and omnidirectional antennas that friends are more concerned about. Antenna introduction:

Omnidirectional antenna

An omnidirectional antenna, that is, it emits 360 ° uniform radiation on the horizontal pattern, which is usually referred to as non-directional, and appears as a beam with a certain width on the vertical pattern. Generally, the smaller the lobe width, The greater the gain. The omni-directional antenna is generally used in mobile communication systems and the station type of suburban districts, with a large coverage area.

  Directional antenna

A directional antenna shows radiation in a certain angular range on the horizontal pattern, which is usually referred to as directional, and appears as a beam with a certain width on the vertical pattern. Like an omnidirectional antenna, the smaller the lobe width , The greater the gain. Directional antennas are generally used in mobile station systems in urban areas, with small coverage areas, high user density, and high frequency utilization.

Orientation is divided into reflective type and directional type. Reflective type: common types are: Shuangling, Great Wall Tablet. This type of antenna works mainly by the reflected signal reaching the vibrator.

Direction type: Common ones are: 8-wood stacked Shuangling has both, the main oscillator signal source: it is leading to the front, and the rear reflecting plate. Mainly depends on reflection, so define the reflection type. Omnidirectional antenna: common 9db.8db. 7db.6db.5db 2db

Directional antenna: stacked Shuangling

3G antenna antenna selection: The above antenna introduction mainly focuses on transmitting. Personally, I think the receiving principle is similar to the transmitting principle. When transmitting, you need to consider a power issue, because if the antenna is not doing well, if the power is too large, the transmitted power is easily transmitted without being transmitted (in short, the standing wave is large, causing power backphasing) to damage the machine . As a reminder, friends who use high-power routers and network cards should lower the power as much as possible if they are not sure about the technical specifications of the antenna.

Regarding the choice of antenna, the key still depends on the use environment. If the environment is less than 6 floors, the field of view is not too wide and there are obstacles between 20-50 meters. It is recommended to use omnidirectional or flat antenna. Personal recommendation: 9db, 8db, 7db.

If it is a small high-rise, or the edge of the community (open vision, the signal is in the distance). It is recommended to use Yagi, 14db or more. This type of antenna is recommended for use within a range of 100-800 meters.

If you use a distance of more than 1000 meters, your personality is public, and friends who like to chat with the urban management can choose the grid, Wei-Star pot.

Selection of antenna materials: For drawings with dimensions: for example, Shuangling, the increase of the reflection plate can add a little effect, and the other will not need to be changed according to the drawings.