Abstract
The traveling wave type antenna generally uses an element of several times of the wavelength. However, by using the dipole antenna with resistive loading, the traveling wave can be generated even if the element of the half-wavelength is used. This type of anntena has a simple structure, and works as a small traveling wave antenna having a broadband characteristic. This paper presents an analysis of two kinds of antennas utilizing the characteristics of this traveling wave antenna. For the analysis of the antennas, the moment method is used, and the loading resistance value on the element can be calculated by the function minimization method. The results show that the dipole antennas with resistive loading have single directivity and can be occurred the circularly polarized wave by changing its element shape. In addition, the antennas optimized for Ground-penetrating radars(GPR) was investigated based on the result.
