Slovník pojmů

Input impedance of the antenna, radiation impedance

Input impedance of the antenna can be measured at the input port of the antenna. Input impedance consists of the radiation resistance R_Σ (when multiplied by the squared input current I_vst², real radiated power is obtained), of the loss-making resistance R_ztr (R_ztr I_vst² equals to the power, which is converted to the heat in the antenna and its surrounding) and of the radiation reactance X_Σ (describes the mutual energy exchange between the antenna and the electromagnetic field in its surrounding). Radiation resistance and radiation reactance form the radiation impedance together.