3G antenna is divided into: 1, omnidirectional antenna 2, directional antenna 3, mechanical antenna 4, electrically tuned antenna 5, dual polarized antenna. Following is a brief introduction of the definitions that my friends are more concerned about.
Directional and omnidirectional antennas. Antenna introduction:
Omnidirectional antenna, that is, 360 degrees uniform radiation in the horizontal direction, that is to say, directionless, in the vertical direction, shows a certain width of the wave.
In general, the smaller the lobe width is, the larger the gain is. Omnidirectional antenna is generally used in mobile communication system with the station type of suburban county system, covering a wide range.
Directional antennas radiate in a certain angle range on the horizontal direction map, which is usually called directionality, and wave with a certain width on the vertical direction map.
Beam, like omnidirectional antenna, the smaller the lobe width, the larger the gain. Directional antenna is generally used in mobile communication system in urban area, which covers a small area.
High household density and high frequency utilization. Direction can be divided into two types: reflective type and directional type. Reflective type: Shuangling, Great Wall plate. Such antennas rely mainly on reflected signals to
Da oscillator to work.
Lead-in type: common are: 8 wooden double diamonds are both, the main oscillator signal source: is the front lead diamond, the rear reflector. Reflective type is defined mainly by reflection.。 Omnidirectional antenna: the common directional antenna is 9db.8db.7db.6db.5db.2db:stacked double diamond
Selection of antenna for 3G: The above antenna introduction mainly focuses on transmitting, and I think the principle of receiving is similar to that of transmitting. There is a power issue to consider when transmitting.
If the antenna does not work well, in the case of excessive power, the transmitted power can easily be reversed if it is not transmitted (in short, the standing wave is large, resulting in power).
Damage machine. Friendship reminds us: Friends who use high-power routing and network card try to turn down the power a little bit when they are uncertain about the technical specifications of self-made antenna.
The choice of antenna depends on the environment. If the residential environment is below 6 floors, the view is not too wide, there are obstructions between 20 and 50 meters, so it is suggested thatUse omnidirectional or flat antenna. Personal Recommendation: 9db, 8db, 7db.
If it is a small high-rise, or the edge of the community environment (wide field of vision, signal in the distance). It is recommended to use Bamu plate with 14 dB or more. Such antennas are recommended at 100-800 metres
Use within the scope.
Use distance of more than 1000 meters, personality publicity, like to chat with city management friends, you can choose grid, Wei - Star pot.
Antenna Material Selection: For sizes of drawings such as Shuangshui, the increase of reflector can increase the effect a little, and the others need not be changed according to the drawings.
Founded in 2007, Shenzhen Feiyuxin Electronics Co., Ltd. is a high-tech enterprise specializing in the development, production and sales of wireless communication products. Focus on
Development and production of antenna, module, application solutions, application terminals and other products. Contact person: Manager Yang 13802709089 (the same number as Wechat).