分割同軸形バルンのスロットからの放射電力の周波数特性

概要

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The input impedances of electrically small radiation elements are generally very frequency-sensitive. When such an element is loaded to a split coaxial balun, radiation from a pair of slots on the balun becomes appreciable. The purpose of this paper is to discuss the frequency characteristics of the radiated power from a split coaxial balun that is fed at an arbitrary point in the slotted section and loaded at the center of the slots with a short dipole antenna varying in length. As the radiation is affected by the diameters of outer conductors and especially by the position of feeding posts, these are treated as parameters. The radiated power from slots is calculated from the far fields obtained by the method of separation of variables. The conduction loss is also taken into account by using a skin depth model on the inside walls of the split section. The circuit theory of BALUN is combined with the field theory to get the frequency characteristics of the input impedance at a reference terminal. The calculated results well agree with the experimental data on 0.03 wave length diameter pipes. These discussions show that the radiated power from a pair of slots becomes superior to that from a dipole antenna when it is shortened to about 40 percent of a half wavelength.
信州大学工学部の論文
1980-12-25