Directional Characteristics of In-phase Self-complementary Radiators

Abstract

Antennas with in-phase currents have higher electrical characteristics than ordinary antennas of metal wires with sinusoidal currents. The in-phase current distribution not only allows us to obtain a high level of antenna matching with the cable, but also significantly changes the antenna patterns. If the current distribution along the radiator is known, it is possible to determine the antenna directivity. Calculation is based on determination of power fluxes through each part of a sphere.Comparison of directional properties of radiators shows that radiators with in-phase currents allow obtaining a higher level of directivity, which is preserved in a wide range of frequencies. A similar method of extending the frequency range by including capacitive loads into metal radiators can be used in self-complementary antennas. The results of applying the described method to flat self-complementary antennas confirms its high efficiency.