Multifeed EBG dual band antenna to feed a reflector antenna

In this paper, we present the design of a multibeam reflector antenna fed by a multifeed dual band Electromagnetic Band Gap (EBG) antenna to achieve a high gain multispot coverage for space applications. First, we design a dual band EBG antenna in monofeed configuration. Then the same antenna in multifeed configuration is studied and the results are compared to those obtained with one horn. Filters have been used in order to reduce the parasitic interferences, which occur in a multifeed EBG antenna and consequently to obtain good radiation characteristics. As shown in this paper the same EBG phase center has been obtained in both frequency bands. Finaly we have studied the whole system composed of the offset reflector and the multifeed EBG dual band antenna. An Edge Of Coverage (EOC) gain higher than 42 dB and sidelobes levels lower than -18dB are obtained over all spots.