All base station antennas has 2 polarizations, -45deg and +45deg. I assume that is because mobile device antennas are in various orientations, but are the basestation signals totally the same and synchronous through both of those outputs or somehow done in sequences?
GSM and LTE antennas use dual polarization to reduce multipath fading, improve signal reception, increase network capacity with MIMO, reduce interference, and provide better coverage, especially in complex environments.
Antenna Dual Polarization for propagation signal horizontal and vertical the user can be choise mode and MIMO can be selectied who to used best communication.
The diffraction of the signals is different for Horizontal and for Vertical polarization. The BS receive antennas use polarization diversity.+ and -45 deg reception is more symetrical than V-H polarization. The same goes for transmission when Tx diversity is used. You may refer to my publications in Researchgate
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