New class of wire antennas with approximately cophasal current distribution

In 1972 Balsley and Ecklund [1] proposed a coaxial colinear (CoCo) antenna, consisting of coaxial-line sections, as sketched in Fig. 1. If the sections are half wavelength long (measured along the line), the total current along the antenna will approximately be in the form of half-period cophasal sine functions. In 1987 and 1989 Balsley et al. proposed a theoretical tool for the analysis of such antennas [2,3]. This paper is aimed at demonstrating that the coco antenna is only a special case of a very wide class of antennas, which need not contain coaxial-line sections at all. In fact, the antennas proposed in this paper are much more flexible than the CoCo antennas, and can easily be optimized with respect to a desired property (e.g., to suppress the sidelobes as, such as possible), which is practically impossible to achieve with CoCo antennas.