Built in antenna, external antenna, sucker antenna, so many kinds of antennas?

Wireless antenna is a kind of equipment that radiates RF signal from coaxial cable to air or receives RF signal from air to coaxial cable.


It converts the guided wave spread on the coaxial cable into radio waves spread in unbounded media, or vice versa. If you choose wrong, you will not get the proper function, and even burn the module seriously


For the design of a wireless network receiving and transmitting machine and equipment used in RF system software, the design and selection of wireless antenna is a key part.


Excellent wireless antenna system software can optimize the communication distance. The size of the same kind of wireless antenna is positively correlated with the optical wavelength of the RF signal. The lower the frequency of the data signal, the larger the required wireless antenna.


The wireless antenna can be divided into external antenna and internal antenna by the installation position. The wireless antenna installed inside the machine and equipment is called internal antenna, and the wireless antenna installed outside the machine and equipment is called external antenna.


1、 Built in wireless antenna


The key of built-in antenna refers to the antenna that can be placed inside the machine and equipment. The key of built-in antenna includes FPC antenna, PCB antenna, spring antenna, ceramic patch antenna, laser immediate forming technology (LDS) and hardware spring antenna.


The built-in wireless antenna is widely used for small-size goods such as handheld machines and equipment, wearing design scheme and smart home system, which has high processing speed and beautiful appearance.


Internet of things technology, intelligent products and commodities must be connected to the network to transmit data, so wireless antennas must be used.


2、 External wireless antenna


The smaller the indoor space and the more frequency bands, the more complicated the antenna design scheme. The external antenna is generally all standard materials. The antenna with the required frequency band can be used without adjustment.


For example, for express boxes and vending machines, the external wireless antenna widely used for magnetic absorption can be absorbed on the white iron shell.


This kind of antenna can't be put inside the iron filing cabinet. The metal material will shield the antenna data signal, so it can only be put outside.


The external wireless antenna can be divided into omnidirectional antenna and directional antenna according to the different viewing angle and orientation of the radiation source field.


Omnidirectional antenna: in the horizontal pattern, it is mainly characterized by 360 ° uniform radiation source, that is, it is often said that there is no specificity. In the vertical pattern, it is mainly characterized by a beam with a certain total width. Generally, the smaller the total width of the beam, the greater the gain.


The key components of external omnidirectional antenna include glass sucker antenna, FRP anti-corrosion antenna and hot-melt adhesive rod antenna.


Directional antenna: refers to a kind of wireless antenna that transmits and receives radio waves especially strongly in one or many special directions, while transmitting and receiving radio waves in other directions are zero or very small.


The purpose of selecting fixed term transmitting antenna is to improve the reasonable utilization rate of radiation intensity and safety; The key purpose of selecting fixed term receiving antenna is to improve the receiving sensitivity and anti-interference. The key of external fixed term antenna includes tablet antenna, Yagi antenna and most cycle time antenna.