The apparent resistance of aerials
Abstract
To determine the reactance and resistance of an antenna, the antenna is regarded as being replaced by a line and the characteristic impedance and the attenuation of the equivalent line are calculated. On the basis of line theory, formula for the resistance and reactance of antennas at the feed point are set up and the two quantities under consideration, and also the local curve of the apparent resistance of the antenna, are represented in diagrams whose substatial agreement with the available measurements is demonstrated. Simple formulas are set up for the reactance and resistance of the simple dipole (quarter wavelength antenna) and for the double dipole (half wavelength antenna) and the reactive power requirement of an antenna is calculated. An approximation formula for the speed of propagation along the antenna is indicated.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 December 1977
 Bibcode:
 1977STIN...7829341S
 Keywords:

 Antennas;
 Current Distribution;
 Dipole Antennas;
 Impedance;
 Radiation Tolerance;
 Analysis (Mathematics);
 Electric Current;
 Electrical Resistance;
 Reactance;
 Wave Propagation;
 Electronics and Electrical Engineering