1300840174

1300840174 technology, also known as antennas, are widely used in many fields of radio transmission and reception. They are widely used in radio, wireless communications, satellite communication, etc. The purpose of the antenna is mainly to transmit or receive electromagnetic waves. Antennas convert electric signals to electromagnetic waves, or electromagnetic waves to electric signals, and thus can be used for transmission and reception of electromagnetic signals.

Applications

Antennas are widely used in various applications, such as radio broadcasting, wireless communication, satellite communication, radar, navigation, global positioning system (GPS), electronic products, remote sensing, etc. For example, radio broadcasting mainly uses directional transmitting antennas for radio broadcasting, directional receiving antennas for radio receiving, and isotropic transmitting antennas for broadcasting transmitting. The antenna system is used in placing satellites and launching rockets. Wireless communication mainly uses directional transmitting antennas for transmitting and omni-directional receiving antennas for to receive signals. In satellite communication, directional transmitting antennas are used to transmit satellite signals and directional receiving antennas are used to receive satellite signals. Radar uses flat antenna or antenna array with higher gain and directional characteristics. In navigation, directional antennas are mainly used, and spherical diverse antennas are used for receiving signals over a wide angle.

Working Principle

Antenna is a device that converts electric signals into electromagnetic waves or electromagnetic waves into electric signals . The antenna is composed of a conductor that serves as an antenna, which is excited by an external connection of a power supply or feeder line to form an electric field, and an electromagnetic field is generated around the conductor. The electromagnetic field is generated in accordance with the Maxwell equations. The antenna\'s radiation pattern represents the radiation characteristics of the antenna in the far field, also known as the antenna radiation pattern. The antenna radiation field shape can be divided into linear polarization, circular polarization, etc., which can complete transmission and reception. The antenna radiation field shape generally has directivity, which means that the radiation strength has an angular relationship and is typically bidirectional, multidirectional, or omnidirectional.