Introduction and Application of Antenna Polarization

Polarization depends on the installation mode of the antenna. Generally, the installation mode includes horizontal and vertical. In order to ensure the best network performance, antennas with the same polarization mode must be used in point-to-point wireless applications. Of course, in some cases, different polarization antennas can also be used to set up wireless links, but this method will have an impact on network performance and connectivity.

Antenna polarization may be one of the least known characteristics of wireless signals. If multiple antennas are to be erected at the same location of the signal tower, polarization becomes a very important consideration. This paper is an overview of antenna polarization.

The biggest advantage of using different antenna polarization methods is to reduce interference. For example, when installing multiple antennas on a signal tower, the best installation method is to stagger the vertically and horizontally polarized antennas from each other to reduce interference.

If the horizontal or vertical polarization cannot meet the needs of wireless applications, there are dual polarization, cross polarization and circular polarization antennas to choose from.

Dual polarization antenna

Two kinds of antenna elements are arranged in the same physical housing (radome), one of which is a vertical polarization element and the other is a horizontal polarization element. When the installation method is correct, the dual polarization antenna can communicate with the vertical and horizontal polarization antenna at the same time. For the use of dual polarization antenna, its significant advantage is that the same antenna equipment actually contains two antennas, which can save space and cost. This type of antenna is usually used for MIMO (multiple input / multiple output) wireless access points and CPE devices.

Cross polarized antenna

Sometimes called cross polarization antenna, two elements are also set in the same housing, but one element is 45 ° polarization and the other is - 45 ° polarization. The positive and negative 45 ° angles of the two elements form a cross configuration. When the cross polarization antenna is combined with the vertical and horizontal polarization antenna, the interference can be further reduced.

Circularly polarized antenna

It produces the same response to horizontally or vertically polarized antennas. Circular polarization antennas are divided into right-handed polarization and left-handed polarization to meet the needs of various wireless connection applications. For the moving long-range linear polarization link, using circular polarization antenna on fixed access point can achieve better results.

Antenna polarization mode

Introduction and Application of Antenna Polarization 1

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