Field Analysis of the Archimedean Spiral Antenna

This article offers an alternative to investigating the radiation of the Archimedean spiral antenna. This is one of the possible applications of the more general theory of the radiation problem that is based on the use of the least-squares boundary residual method. The field potentials are expressed through the general wave equation basis functions in a spherical coordinate system. For highly accurate fulfillment of the boundary condition, only 20 modes were required. All field components in both the near and far zones are derived from the radial component of magnetic and electric vector potentials.