What are the basic parameters of the antenna?

The basic parameters of the antenna are ratio, gain, standing wave ratio coefficient, horizontal and vertical angles, front-to-back ratio and power.

Antenna is a kind of transducer, which converts guided waves propagating on transmission lines into electromagnetic waves propagating in unbounded media, and vice versa. Components used to transmit or receive electromagnetic waves in radio equipment and engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing and radio astronomy.

Anyone who uses electromagnetic waves to transmit information relies on antennas to work. In addition, when transmitting energy through electromagnetic waves, non-signal energy radiation also needs an antenna. Generally speaking, the antenna is reversible, that is, the same antenna can be used as a transmitting antenna and a receiving antenna at the same time, and the basic characteristic parameters of the same antenna as transmitting or receiving are the same.

Common antennas:

1, flat antenna

Regardless of GSM or CDMA, flat antenna is the most widely used and extremely important base station antenna. The advantages of this antenna are high gain, good sector pattern, small back lobe, convenient control of vertical pattern depression angle, reliable sealing performance and long service life.

2. Loop antenna

The loop antenna is very similar to the human body and has the function of a common monopole or multistage antenna. In addition, the small loop antenna is an ideal antenna for micro-communication products because of its small size, high reliability and low cost. A typical loop antenna consists of an electrical loop consisting of copper traces on a circuit board, or it can be a piece of wire that is made into a loop.