Patent ID: 7872611

Claim:
A leaky coaxial antenna comprising: an inner conductor, a dielectric around the inner conductor, a first shield conductor disposed around the dielectric, the first shield conductor having openings distributed in longitudinal direction of the inner conductor and being adapted in that electromagnetic energy passes through the openings, characterized by a second shield conductor disposed around the first shield conductor, the second shield conductor being adapted to cover at least a number of the openings of the first shield conductor in a shielded section, wherein the second shield conductor is arranged discontinuously in the longitudinal direction of the antenna defining tubular shield sections and uncovered portions of the first shield conductor in the longitudinal direction of the antenna, which are adapted in that electromagnetic energy passes through the uncovered portions, and wherein each of the tubular shield sections is having an axial length distinctly greater than half of a wavelength of operating frequencies for preventing the electromagnetic energy from passing to the outside of the antenna within each of the tubular shield sections.