4G antenna is a device that converts high-frequency current or waveguide energy into electromagnetic waves and emits them in regular directions, or restores electromagnetic waves from a certain direction to high-frequency currents. Regarding 4G antennas, the editor of Shenxun shares some basic knowledge based on industry experience.

The basic knowledge of 4G antennas you must know

4G antenna classification:

1. Classified by purpose: can be divided into communication antennas, TV antennas, radar antennas, etc.;

2. Classified by operating frequency band: can be divided into shortwave antennas, ultrashortwave antennas, microwave antennas, etc.;

3. Classified by directivity: can be divided into omnidirectional antennas, directional antennas, etc.;

4. Classified by shape; can be divided into linear antennas, planar antennas, etc.

Omnidirectional antenna

That is, it shows uniform radiation in 360° on the horizontal pattern, which is also called non-directional. On the vertical pattern, it shows a beam with a certain width. In general, the smaller the lobe width, the greater the gain. .

Directional antenna

In the horizontal pattern, the radiation is planned at a certain angle, which is also directional. On the vertical pattern, it is shown as a beam with a certain width. Like an omnidirectional antenna, the smaller the lobe width, the greater the gain. Big.

Gain

Gain refers to the ratio of the power density of the signal generated by the actual antenna and the aspiring radiating unit at the same point in space under the condition of the input power being flat. It quantitatively describes the degree to which an antenna concentrates the input power and radiates it. The gain is significantly in close contact with the antenna pattern. The narrower the main lobe of the pattern and the smaller the side lobe, the higher the gain.