Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1991-08-09
1993-05-25
Hille, Rolf
Communications: radio wave antennas
Antennas
Plural separate diverse type
343781CA, 343786, H01Q 21280, H01Q 19190
Patent
active
052144380
ABSTRACT:
The present invention is an integrated millimeter wave (MMW) and an infrared (IR) common aperture sensor employing a common primary reflector for infrared and millimeter wave energy. An active transmitter/receiver millimeter wave horn assembly located at the focus of the primary mirror transmits and receives millimeter wave signals off the primary reflector. A selectively coated dichroic element is located in the path of the millimeter wave energy on the axis between the feed and the primary reflector. The dichroic element reflects infrared energy from the primary reflector to a focal point and at the same time transmits and focuses millimeter wave energy. An optical system relays the infrared energy to a focal plane behind the primary mirror. The dichroic element transmits and focuses millimeter wave energy without significant attenuation such that optical and millimeter wave energy may be employed on a common boresight. Improvements in the feed assembly include a four channel waveguide structure capable of azimuth and elevation determination in sum and difference configurations. A baffle and cold stop shields the optical system from unwanted infrared radiation. Electrical transmit and receive circuitry and a correction circuit provide high probability of detection and low false alarm rate.
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Brusgard Thomas C.
McCormick Thomas C.
Schwerdt Christopher B.
Sijgers Hendrik K.
Smith Corbitt T.
Brown Peter Toby
Hille Rolf
Sutcliff W. G.
Westinghouse Electric Corp.
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