Metal plates structures exhibit refractive properties allowing the design of lens at microwave applications. A metal lens consist of a set of metallic plates placed side by side, parallel to each other, and away by a distance greater than half wavelength and less than a wavelength, so that electric field of incident wave is aligned parallel to the plates. Refractive properties arise from phase velocity increase of electromagnetic wave due to metal plate presence. The plate shape defines the wave propagation direction between the plates, allowing field distribution handling at lens output interface. Field distribution handle in aperture enable us, consequently, to control radiation pattern. In this work, an approximate techniques of synthesis and analysis for metal plates lens are outlined with the objective of improve structure gain. Geometric optics approach was used for synthesis technique, while, in analysis, diffraction effects was taken into account at surface lens. In order to evaluate the synthesis and analysis techniques, designed structures are submitted to a rigorous analysis in the time domain. Results for corrective lenses with H plane horns and metal plates lens in front of pyramidal horns are presented and discussed.