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The working principle of the antenna
Category：Industry News Publish：2019-3-7 11:16:59 Browse：1786
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Antenna itself is an oscillator, but different from ordinary LC oscillation circuit, it is normal deformation of the tank.
Electromagnetic energy from the transmitting antenna radiation, the forward propagation along the surface of all direction. If a conductor is placed in alternating electromagnetic field, due to the magnetic force line conductor, the incentive certain alternating voltage - electromotive force on both ends of the wire, its frequency is the same as the transmitting frequency. If the wire through the feeder are connected to the receiver, the receiver can obtain modulated wave signal of current. So the wire up to receive the role of high frequency signal current electromagnetic energy is converted into energy, therefore said the wires for the receiving antenna. Both transmitting antenna and receiving antenna, they all belong to the energy converter, "reciprocity" is the general characteristics of the energy converter. Also a pair of antenna, it can be used as a transmitting antenna, can be used as a receiving antenna and communications equipment are generally received and sent together with an antenna. As a result, the same antenna is relationship to the transmitting system of effective energy output, and directly affects the performance of the receiving system.
Antenna the reversibility of performance not only in the transmitting antenna can be used as a receiving antenna, receiving antenna can be used as a transmitting antenna, and perform the antenna used for transmitting antenna parameters, and used as the parameters of the receiving antenna in remains the same, this is the reciprocity principle of antenna.
1. The input impedance
To make the antenna to get the most power, should make the antenna and feeder match, just need to know the antenna input impedance. The antenna input impedance Zin as the ratio of the input voltage and input current. The input impedance generally includes input resistance and input reactance. Input resistance corresponding to the antenna radiation power and power loss of antenna system, namely the Rin = Rro + Rs Rs is calculated from the input end of wear resistance, the input reactance corresponds to the reactive power of induction field around the antenna.
2. The working frequency band
Antenna working frequency band is similar to the meanings of the meanings and circuit of frequency band, it refers to the antenna can meet the requirements of the technology at work frequency range. For there is only one frequency or within easy reach of several frequency communication equipment, the band width of antenna without consideration. But to have two or more frequency, and frequency offset and larger communication equipment, it must consider the band width of the antenna.
Electromagnetic energy from the transmitting antenna radiation, the forward propagation along the surface of all direction. If a conductor is placed in alternating electromagnetic field, due to the magnetic force line conductor, the incentive certain alternating voltage - electromotive force on both ends of the wire, its frequency is the same as the transmitting frequency. If the wire through the feeder are connected to the receiver, the receiver can obtain modulated wave signal of current. So the wire up to receive the role of high frequency signal current electromagnetic energy is converted into energy, therefore said the wires for the receiving antenna. Both transmitting antenna and receiving antenna, they all belong to the energy converter, "reciprocity" is the general characteristics of the energy converter. Also a pair of antenna, it can be used as a transmitting antenna, can be used as a receiving antenna and communications equipment are generally received and sent together with an antenna. As a result, the same antenna is relationship to the transmitting system of effective energy output, and directly affects the performance of the receiving system.
Antenna the reversibility of performance not only in the transmitting antenna can be used as a receiving antenna, receiving antenna can be used as a transmitting antenna, and perform the antenna used for transmitting antenna parameters, and used as the parameters of the receiving antenna in remains the same, this is the reciprocity principle of antenna.
1. The input impedance
To make the antenna to get the most power, should make the antenna and feeder match, just need to know the antenna input impedance. The antenna input impedance Zin as the ratio of the input voltage and input current. The input impedance generally includes input resistance and input reactance. Input resistance corresponding to the antenna radiation power and power loss of antenna system, namely the Rin = Rro + Rs Rs is calculated from the input end of wear resistance, the input reactance corresponds to the reactive power of induction field around the antenna.
2. The working frequency band
Antenna working frequency band is similar to the meanings of the meanings and circuit of frequency band, it refers to the antenna can meet the requirements of the technology at work frequency range. For there is only one frequency or within easy reach of several frequency communication equipment, the band width of antenna without consideration. But to have two or more frequency, and frequency offset and larger communication equipment, it must consider the band width of the antenna.
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