Base station antennas play a very critical role in the entire communication system, especially the communication station as a communication hub. This article will focus on the different types of base station antennas and analyze their purchase.
The high-gain antenna can not only increase the coverage area of radio waves, but also amplify the received signal, which can better receive the weak uplink signal and improve the wireless communication quality between the mobile station and the base station. In general, high-gain antennas are used for base stations, and narrow-band filters can be installed to reduce the impact of interference in the case of interference. Commonly used base station antennas include FRP antennas, four-ring array antennas, and directional antennas.
1. FRP antenna
The FRP antenna is an omnidirectional antenna with basically no directionality, which is suitable for the situation that the base station is located in the central area of the communication network. Because FRP antennas are easy to install, they are widely used in various base stations. The maximum gain of FRP antenna can reach about 10db, the higher the gain, the longer the antenna, the general gain of 5-6db gain FRP antenna is more competitive in length and **, the manufacturing process is also more mature, and more is used.
In addition to the electrical performance of this kind of antenna, the quality of the outer FRP radome is also very different, some inferior products in the wind and sun for a year after the outer layer of FRP will crack the situation resulting in the scrapping of the entire antenna, some large brands of FRP antennas in the quality is more guaranteed.
2. Directional antennas
The directional antenna is equivalent to concentrating the energy in multiple directions into one direction to transmit, and has the characteristics of high radiation gain in the main direction, and the Yagi antenna is commonly used. The higher the number of cells in the Yagi antenna, the higher the gain, which is suitable for point-to-point long-distance communication and sub-stations located at the edge of the communication network. It is more suitable for the police station located in remote areas to contact the higher-level sub-bureau, and the effect will be better than that of FRP antenna when used properly.
Three, four ring array antennas
The characteristics of the four-ring array antenna are that the power is large, the gain is high, and the gain direction is adjustable, which is suitable for the use of communication hubs (sub-bureaus and municipal bureaus and relay stations), but its ** is relatively high.
The direction of the four transmitting oscillators of the four-ring array antenna is adjustable, and the antenna characteristics are basically omnidirectional when the four oscillators are installed at an interval of 90 degrees, and the antenna characteristics are directional, and the gain in the main radiation direction is increased at the same time. With the characteristics of adjustable gain direction, it can better adapt to irregular service areas. If the gain of the quad-ring array antenna is not high enough, an eight-ring array antenna can be considered, which has similar characteristics to the four-ring array but provides a higher gain. Generally, the gain of the four-ring array in the 350MHz band is 8dB (omnidirectional) and 10dB (directional), and the gain of the eight-ring array is 12dB (omnidirectional) and 15dB (directional).