Release date：2021-12-28Author source：KinghelmViews：405
Shenzhen jinhangbiao Electronics Co., LtdFounded in 2007, shenzhenkinghellmelectronco., Ltd. is a national high-tech and dual soft certification enterprise, "senior member unit of China satellite navigation Association", an enterprise with ISO9001 (04617q13625ros) quality management certification system, and is improving iatf16949 automobile quality management system. Its main business is the R & D, production and sales of Beidou satellite navigation and IOT terminal application hardware, and www.bds666.com Com logistics information intelligent system solution.
There are many types of base station antennas, and the appearance of different types of antennas in mobile communication. Then, let's talk about the editor of golden beacon Electronics:Base station antennaWhat are the classifications?
4. Electrically adjustable antenna
A mobile antenna that uses electronics to adjust the tilt down angle. The principle of electronic downdip is to change the phase of the oscillator of the collinear array antenna, change the amplitude of the vertical component and horizontal component, and change the field strength of the composite component, so as to make the vertical pattern of the antenna downdip. As the field strength in each direction of the antenna increases and decreases at the same time, it is ensured that the antenna pattern changes little after changing the inclination angle, which shortens the coverage distance in the main lobe direction, and reduces the coverage area of the whole directional pattern in the service cell sector without interference.
The practice shows that the dip angle of electrically tunable antenna is 1-deg- 5° When changing, the antenna pattern is roughly the same as that of the mechanical antenna; The dip angle is 5-deg- 10° When changing, the antenna pattern is slightly better than that of mechanical antenna; The dip angle is 10 DEG- 15° When changing, the antenna pattern changes more than that of mechanical antenna; When the mechanical antenna tilts down 15 DEG; After, the antenna pattern is significantly different from the mechanical antenna. At this time, the shape of the antenna pattern changes little, and the coverage distance in the main lobe direction is significantly shortened. The whole antenna pattern is in the sector of the base station. Increasing the downward tilt angle can reduce the sector coverage area without interference. Therefore, the use of electrically adjustable antenna can reduce call loss and interference.
In addition, the electrically adjustable antenna allows the system to adjust the inclination angle under the vertical directivity map without stopping, monitor the adjustment effect in real time, and the step accuracy of adjusting the inclination angle is also high (0.1 & deg;), Therefore, the network can be finely adjusted; The third-order intermodulation index of electrically modulated antenna is - 150dbc, which is 30dbc different from that of mechanical antenna, which is conducive to eliminating adjacent frequency interference and stray interference.
5. Dual polarization antenna
Dual polarization antenna is a new antenna technology, which combines 45 DEG; And -45° Two antennas with orthogonal polarization directions work in the transceiver duplex mode at the same time, so its most prominent advantage is to save the number of antennas of a single directional base station; In general, the directional base station (three sectors) of LTE digital mobile communication network uses 9 antennas, and each sector uses 3 antennas (spatial diversity, one transmitter and two receivers). If dual polarization antenna is used, each sector only needs 1 antenna; At the same time, in the dual polarization antenna, & plusmn; 45° The orthogonality of polarization can ensure 45 DEG; And -45° The isolation between two antennas meets the requirements of intermodulation on the isolation between antennas (≥ 30dB), so the spatial spacing between dual polarization antennas only needs 20-30cm;
In addition, dual polarization antenna has the advantages of electrically adjustable antenna. The use of dual polarization antenna in mobile communication network can reduce call loss, reduce interference and improve the service quality of the whole network. If the dual polarization antenna is used, because the dual polarization antenna does not have high requirements for erection and installation, there is no need for land acquisition and tower construction. It only needs to erect an iron column with a diameter of 20cm and fix the dual polarization antenna on the iron column according to the corresponding coverage direction, so as to save infrastructure investment, make the layout of the base station more reasonable and make the selection of the base station site easier.
For the selection of antenna, the mobile antenna suitable for the local mobile network shall be selected according to the actual situation of network coverage, traffic, interference and network service quality:
· In high traffic areas with dense base stations, dual polarization antenna and electric modulation antenna should be used as much as possible;
· Traditional mechanical antennas can be used in areas where the traffic is not high, where the base stations are not dense and where only coverage is required.
The above is all the content sharing brought by the small series of golden navigation mark electronics. I hope it will help you. Thank you for reading!
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