Other functions of the antenna

An antenna is an impedance matching device - effectively feeding transmitter power into space;
An antenna is an illuminating or focusing device with directional radiation capability;

Anantenna is a polarizing device that generates an electromagnetic field with a specified polarization.


Classification of Antennas


Usage - detection antenna, communication antenna, navigation antenna, radar antenna, broadcasting antenna, etc;

Using frequency bands - for long wave antennas, medium wave antennas, short wave antennas, ultra short wave antennas, and microwave antennas, etc;

Structural forms - line antenna and surface antenna, horn antenna, microstrip antenna, etc

Focusing characteristics - strong directional antennas and weak directional antennas, or directional and omnidirectional antennas,

Working frequency band - broadband and narrowband antennas;

Polarization forms - linear polarization and circular polarization antennas, etc;

Working principle - standing wave antenna, traveling wave antenna, array antenna, etc.


2. The Application of Antennas in Electronic Systems


Communication, broadcasting (television), reconnaissance and direction finding, radar, navigation, identification of friend or foe, etc


2.1 Communication antenna

Common wireless communication methods

Long wave communication - propagation of sky waves and ground waves

Short wave communication - propagation of sky waves and ground waves

Ultra short wave communication - line of sight propagation and diffraction propagation

Microwave communication - line of sight propagation.