Scattering by Dipoles in Inset Dielectric Guide and Application to Millimetric Leaky Wave Antennas

Inset Dielectric Guide (IDG) is an alternative to Image Line retaining most of its advantages without its main disadvantages. In particular, it is possible to realise in IDG, low-cost leaky wave antennas with very pure polarization properties by laying thin metal strips on the air-dielectric interface. We analyse theoretically the scattering properties of a thin metal strip by means of a Ritz-Galerkin variational approach taking into proper account the edge singularities. This information is being applied to the design of a one-dimensional array and the result experimentally verified.