Theory of Thin Dielectric Cover on Slitted Rectangular Waveguide Antenna

摘要

A thin dielectric sheet or slab which covers the radiating sur-face of a slitted rectangular waveguide can serve as a radome for this type of leaky wave antenna. Theoretical expressions are derived for the propagation constants of a leaky wave on a slitted rectangular wave¬guide which is covered by such a dielectric slab.nNumerical results are presented in graphical form and show that only the attenuation constant of the leaky wave is significantly affected by the presence of the dielectric slab when its thickness is comparable to or greater than the width of the narrow slit.