Abstract: A radio frequency transponder/repeater is provided wherein an array of receiving antenna elements is coupled to an array of transmitting antenna elements to provide a directional antenna system and including additionally an internal radio frequency source which is also coupled to the array of transmitting antenna elements. With such arrangement, an internally generated signal provided by the radio frequency source may be transmitted using the transmitting array of the Van Atta System.

Abstract: A radio frequency array antenna system wherein an array of antenna elements in a multibeam array antenna is coupled to one of a pair of beam forming networks and a portion of such antenna elements is coupled to another one of the pair of beam forming networks. Radio frequency amplifiers are coupled between the array of antenna elements and the pair of beam forming networks. The beam forming network which is coupled to only a portion of the antenna elements is used in the transmission of continuous wave radio frequency energy and the other beam forming network is used in the transmission of pulsed radio frequency energy. During transmission of the continuous wave energy only the portion of the radio frequency amplifiers coupled to the corresponding beam forming network is powered and during transmission of pulse modulated radio frequency energy all of the radio frequency amplifiers are supplied with power.