UHF antenna knowledge

1. Antenna classification:

During the propagation of electromagnetic waves, the direction of the electric field vector is linear polarization if the electric field always points in one direction. If the electric field rotates, it is elliptical polarization or circular polarization.

If the linear polarization of transmitting and receiving is exactly Tongxiang, the maximum level value is received. If the linear polarization of transmitting and receiving is vertical, the received level value is 0. The main advantage of circular polarization is that when it is used for transmission, if linear polarization is used for reception, the level value can be received in any direction of linear polarization, that is, there is no linear polarization and linear polarization vertical. When the level value cannot be received.

Circular polarization signal means that electromagnetic waves propagate in a spiral rotation mode during transmission. The direction of its rotation determines the way it plans. The electromagnetic wave propagating in a clockwise direction is called right-hand polarization, which is indicated by the letter R; the electromagnetic wave propagating in a counterclockwise direction is called left-hand polarization, which is indicated by the letter L. Some satellites launched earlier use circular polarization. The main advantage of circular polarization point dial compared to linear polarization electromagnetic waves is that there is no need to adjust the polarization angle when taking over.

2. Application in UHF

Linear polarization transmitting antenna: high gain, narrow beam. In this case, a tag antenna with circular polarization is required.

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