The solution explored in this research work was to design, fabricate and measure only-metal engineered lenses, inspired on metamaterial concepts reinterpreted to fit with the stringent constraints imposed by high power handling. Radically novel lens designs were envisioned, using only smooth apertures to avoid arcing. Highly demanding analytical and simulation tools have been necessary, due to the large size of the structures and the small size of the apertures. Also, complex measurement procedures were developed: first a low-power anechoic chamber characterization and later a high-power in situ measurement of the developed prototypes. Some initial measurements are shown in Fig. 1 with a reflection based measure setup as indicated in Fig. 2 that also displays a picture of the lens.