What is an antenna? How to choose the right antenna?

In the field of communication technology, antennas play an important role. Whether it is a transmitter or a receiver, antennas need to be used, the right antenna can optimize the network, increase the range and reliability of communication, and inappropriate antennas will lead to a decrease in communication quality. Since antennas are so important, Siwei Wireless will introduce what antennas are, how antennas work, and how to choose antennas correctly.

What is an antenna

An antenna is a device that converts an electric field into electromagnetic waves.

The principle of the antenna

The antenna converts the electric field into a magnetic field to form an electromagnetic wave to transmit the signal, and the reverse converts the magnetic field into an electric field and then transmits it to the device through the line, thus forming the transmission and reception of wireless signals.

Teach you to choose the antenna correctly

As we have already said, the right antenna can improve the quality of communication and expand the scope of communication, which in turn will reduce the quality of communication. So how should we choose the right antenna? Start with antenna parameters: frequency, matched impedance, voltage VSW, gain, and polarization. For wireless communication products (e.g., the antenna operating frequency and gain commonly found in the datasheet).

1. Working frequency

The antenna is used to transmit and receive electromagnetic waves, just like a converter, the current becomes an electromagnetic wave, and then the electromagnetic wave is converted back into a current, and the last important parameter is the operating frequency. For example, a 2.4GHz antenna used to communicate with devices operating in the 5G band may cause a very poor signal or a reduced transmission rate.

2. Gain

Antenna gain represents the degree of energy concentration of the antenna on the signal and the efficiency of the conversion, increasing the gain of wireless communication is not to amplify the signal, but to aggregate the energy of the signal. Gain can affect the direction of antenna operation, generally speaking, the higher the gain, the stronger the directionality of the antenna, and conversely, the more uniform the radiation distribution in all directions.

The type of antenna

Spring antenna, rod antenna, suction cup antenna, Yagi antenna, plate antenna, indoor ceiling antenna.

Antenna type: spring antenna, rod antenna, suction cup antenna, Yagi antenna, plate antenna, indoor ceiling antenna.

Antenna is an important part of the communication system, good quality, suitable antenna, in order to improve the quality of communication, expand the scope of communication. Common communication antennas are spring antennas, rod antennas, and chuck antennas.