Velocity factor of leaky-wave antenna based on partially filled rectangular waveguide

A Leaky-wave antenna based on a covered rectangular waveguide with partially dielectric filling and transverse slots is investigated. The complex propagation constant is defined by matching of magnetic field in slots. A velocity factor dependences on the waveguide filling parameters are presented. The influence of the dielectric position in the waveguide on the antenna characteristics is considered. The radiation pattern is analyzed. A pattern tilt angle, an optimal antenna length and a first null beamwidth are defined.