External antenna
External antenna can be divided into omnidirectional antenna and fixed term antenna depending on the Angle and azimuth of radiation source field.
Indoor radiation diagram of omnidirectional antenna
Omnidirectional antenna: that is, in the horizontal diagram, it is mainly represented as a 360° symmetrical radiation source, which is usually said to be non-specific. In the vertical diagram, it is mainly represented as a beam with a total width. In general, the smaller the total width of the lobe, the greater the gain. The key components of the external omnidirectional antenna are the glass sucker antenna, the glass steel anticorrosive antenna and the hot melt glue stick antenna.
Indoor space radiation diagram of directional antenna
Directional antenna: An antenna in which the transmission and reception of radio waves are particularly strong in one or more special directions and zero or very small in other directions. The purpose of selecting the fixed-item transmitting antenna is to improve the reasonable utilization rate of radiation intensity and the lifting performance. The key objective of selecting a fixed receiving antenna is to improve the receiving sensitivity and anti-interference. The key external antenna includes tablet antenna, Yagi antenna and most cycle time antennas.
Magnetic antenna：
Magnetic antenna: relatively high gain, the larger feature is containing strong magnet glass sucker, fixed and convenient installation, but the glass sucker should be adsorbed on the metal surface. In the field of wireless module, glass magnetic antenna and wireless module often cooperate with each other, so as to improve the communication distance of wireless module, such as wireless intelligent meter reading, vending machines, express boxes, vehicle radio and so on.
Copper rod magnetic antenna: similar to the general whip magnetic antenna, but compared with whip glass sucker’s advantages depend on the selection of large diameter all-copper radiator, its ohmic loss is small, antenna efficiency, network bandwidth cover wide. It is suitable for data transmission stations with relatively high performance requirements and picture transmission with medium horizontal spacing.
Hot glue stick antenna: is the most common external antenna, its gain is moderate, relatively cheap, common in wireless communication control module, wireless router, digital radio and so on. The antenna size suitable for installation can be selected according to the requirements of indoor space. The selection of antenna size is related to the gain. In general, the longer the frequency segment, the higher the gain.
FRP anti-corrosion antenna: in the omnidirectional antenna, FRP anti-corrosion antenna performance is more excellent, the core is all copper vibrator, the use of balanced explosion-proof switch, less environmental harm; The casing is made of high quality glass fiber reinforced plastic anticorrosion, which has very good three-proof characteristics and integrates well into the geographical environment. Especially suitable for long distance gateway ip data signal covering, image transmission, etc.
Post time: Jun-05-2023
