The Bi-Directional Antenna, is a new type of antenna technology. It combines two antennas with orthogonal polarization directions of +45° and -45° and works in the transceiver duplex mode at the same time. Therefore, its most prominent advantage is to save a single The number of antennas of the directional base station;
Generally, the directional base station (three sectors) of the GSM digital mobile communication network uses 9 antennas, and each sector uses 3 antennas (space diversity, one transmitter and two receivers). If dual-polarized antennas are used, each sector only needs 1 Root antenna
At the same time, because in dual-polarized antennas, the polarization orthogonality of ±45° can ensure that the isolation between the +45° and -45° antennas meets the requirements of intermodulation on the isolation between antennas (≥30dB), Therefore, the space between dual-polarized antennas only needs to be 20-30cm;
In addition, dual-polarized antennas have the advantages of electrically adjustable antennas. The use of dual-polarized antennas in mobile communication networks is the same as electrically adjustable antennas, which can reduce call loss, reduce interference, and improve the quality of service of the entire network.
Since the dual-polarized antenna has low requirements for erection and installation, there is no need to requisition land to build a tower. Only a 20cm diameter iron pole is needed to fix the dual-polarized antenna on the iron pole according to the corresponding coverage direction, thereby saving infrastructure investment At the same time, the layout of the base station is more reasonable, and the site selection of the base station is easier.
