Antenna with Loads

Abstract

Application of the impedance line method to radiators with concentrated loads permits to create antennas with required characteristics, in particular, the wideband monopole, an antenna with the given current distribution, etc. Wideband radiators must have an exponential or linear in-phase current distribution, created by capacitive loads that vary, in particular, along the radiator length in accordance with linear law. In order to retain in-phase current distribution in a wider frequency range, the capacitances of these loads should vary in inverse proportion to the squared frequency. Using of capacitive loads in V-dipoles yields similar results.

Keywords: Antenna with required current distribution, Capacitance of a bottom capacitor, Decrease of antenna reactance, Exponential current distribution, Freedom of antenna length choice, Frequency-dependent capacitance, Frequency ratio, High matching level, In-phase current distribution, Inverse problem of the radiators theory, Load as parallel connection of a resistor and a capacitor, Maximal matching level, Negative inductance, Optimization of 12-meter antennas, V-dipole, Weakening the effect of metal structures upon the pattern, Wide-band monopole, Wide frequency range.