Reflectarray using an offset prolate feed at 94 GHz

The design of an offset reflectarray illuminated by an original primary source at 94 GHz was tested successfully. The antenna shows very low side lobe and cross-polarization levels. These results are of interest for multi-beam applications, when the system is fed by several sources. Simulations were made with a computer-model that gives, in less than 10 minutes on a standard PC, a good approximation of the radiation pattern in the H-plane. The problem of the specular reflection has still to be overcome as well in simulations as in the design. In order to solve it partially, the next step will be the realization of an offset feed with a main radiation in the specular direction.