Working principle and function
As an indispensable part of wireless communication, the basic function of antenna is to radiate and receive radio waves. When transmitting, the high-frequency current is converted into electromagnetic waves; On reception, the wave is converted into a high frequency current.
Varieties of antenna
There are many kinds of antennas, and they can be classified into the following types: Base Station Antenna and Mobile Portable Antenna antennas for different uses can be divided into ultra-long wave, long wave, medium wave, short wave, ultra-short wave and microwave antennas for different operating frequency bands. According to its direction, it can be divided into omnidirectional and directional antennas.
How to Select an Antenna
As an important part of the communication system, the performance of the antenna directly affects the index of the communication system. The user must pay attention to its performance first when choosing the antenna. Specifically, there are two aspects, the first choice of antenna type; The second choice is the electrical performance of the antenna. The significance of selecting the antenna type is: whether the pattern of the selected antenna meets the requirements of radio wave coverage in the system design; The requirements for selecting the electrical performance of the antenna are as follows: Determine whether the electrical specifications of the antenna, such as frequency bandwidth, gain, and rated power, meet the system design requirements. Therefore, the user had better contact the manufacturer when choosing the antenna.
Gain of antenna
Gain is one of the main indexes of an antenna. It is the product of the direction coefficient and the efficiency, and it is the expression of the size of the antenna radiation or received waves. The choice of the gain size depends on the requirements of the system design for the radio wave coverage area. Simply put, under the same conditions, the higher the gain, the farther the radio wave propagation distance. Generally, the base station antenna adopts the high gain antenna, and the mobile station antenna adopts the low gain antenna.
Post time: Aug-25-2022