Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1985-12-26
1987-10-06
Sikes, William L.
Communications: radio wave antennas
Antennas
Plural separate diverse type
343770, 342 53, H01Q 1310, H01Q 2128
Patent
active
046986383
ABSTRACT:
A dual mode target seeking system for airborne vehicles which operates under two different frequencies simultaneously includes a radio frequency antenna comprising a slotted plate defining a ground plane with an image plate positioned in front of the ground plane at a distance chosen such that multiple reflected rays are in phase with each other and with waves incident on the image plate. The slotted plate and image plate have aligned central openings through which an electro-optical system for operating under a chosen electro-optical frequency range, for example under infrared frequencies, projects. The electro-optical system includes a detector unit positioned behind the antenna and a focussing system for directing incoming electro-optical radiation into the detector unit. The focussing system includes first and second lenses mounted in the openings in the image plate and slotted plate, respectively. The lenses each transmit radiation in the chosen electro-optical frequency range while at least partially reflecting radio frequency radiation.
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Branigan John T.
Malaise Jacques J.
General Dynamics Pomona Division
Johnson Edward B.
Martin Neil F.
Sikes William L.
Wimer Michael C.
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