With the development of information technology in this era, our life is also more intelligent and convenient. In daily life, whether it is a mobile phone, tablet or laptop, wireless router or base station, the antenna (or multiple antennas) plays a key role in the signal chain and determines the performance of the system. So today we will briefly talk about some basic knowledge of the antenna.


The initial smart antenna technology is mainly used for radar, sonar, military anti-jamming communication, to complete spatial filtering and positioning. In recent years, with the development of mobile communication and the gradual deepening of research on mobile communication radio wave propagation, networking technology, antenna theory, etc., modern digital signal processing technology has developed rapidly, and the processing capability of digital signal processing chips has been continuously improved. It is possible to form the antenna beam by the baseband, which improves the reliability and flexibility of the antenna system.

Antenna background

With the rapid development of information transmission, the application of wireless modules is becoming more and more extensive. Wireless modules are widely used in remote control, wireless meter reading, identification, electronic price tags, signal acquisition and other fields, so higher requirements are also placed on the communication distance of wireless modules.

The transmission distance of the wireless module is mainly affected by the transmit power and the receive sensitivity. The influence of the antenna on the above parameters is particularly obvious. This paper discusses the influence of the antenna on the overall communication performance of the wireless module.

The role of the antenna

Antennas are an indispensable part of any radio communication system. Although the tasks to be performed by various types of radio equipment are different, the role of the antenna in the equipment is basically the same. Any radio equipment transmits information through radio waves, so it must have a device that can radiate or receive electromagnetic waves.

 

Therefore, the first function of the antenna is to radiate and receive electromagnetic waves. Of course, not everything that can radiate or receive electromagnetic waves can be used as an antenna.

 

Another role of the antenna is "energy conversion". As we all know, it is not radio waves that the transmitter sends into the antenna through the feeder, and the receiving antenna cannot directly send radio waves into the receiver. There is an energy conversion process, that is, the high frequency generated by the transmitter is converted. The oscillating current is sent to the input end of the antenna through the feeder, and the antenna should convert the high-frequency current into space high-frequency electromagnetic waves, and radiate to the surrounding space in the form of waves. Conversely, when receiving, the intercepted high-frequency electromagnetic wave energy is converted into high-frequency current energy through the receiving antenna, and then sent to the receiver. Obviously there is a conversion efficiency issue here. The higher the antenna gain, the higher the conversion efficiency.

This article explains some of the basics of antennas. I believe you have a certain understanding of this. I hope that through the above introduction, it will have a certain reference value for readers. If you want to know more or have any needs, you can log in to the renhotec platform and contact us at any time.