摘要 |
<p>The airborne IFF antenna is comprised of: a unique radiating primary element (20); a plurality of parasitic elements (30, 40, 50) associated with said primary radiating element; and switching means for switching each of said respective parasitic elements so as to modify selectively the diagram proper to each primary radiating element in order to obtain: either an omnidirectional diagram corresponding to the IFF watching mode diagram, or a first directive diagram corresponding to the forward directive diagram in the IFF interrogation mode, or a second directive diagram corresponding to the control diagram in the IFF interrogation mode. The switching of parasite elements allows additionally, for the first and/or the second directive diagram, to obtain selectively the directive forward diagram corresponding either to a first standard IFF (Western standard) on a first frequency band or to a second IFF standard (Eastern standard) on a second frequency band different from the first frequency band.</p> |