Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1992-04-28
1993-08-17
Hille, Rolf
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343776, H01Q 2300, H01Q 1906, H01Q 2106
Patent
active
052373347
ABSTRACT:
A millimeter wave imaging system receives millimeter wave radiation and provides video imaging signals based thereon. The system comprises an imaging lens for receiving incoming radiation; a focal plane antenna array disposed at the focal plane of the lens on which radiation received by the lens is focussed; and signal processing and display circuitry for processing the output of the antenna array and for producing and displaying corresponding video imaging signals. The focal plane antenna array comprises a planar array of a plurality of conical horns and circular waveguides which, in use, are disposed at the focal plane of the lens; and a microstrip detector assembly coupled to the waveguides for detecting the radiation received thereby. The microstrip detector assembly comprises a dielectric substrate having a plurality of microstrip conductors embedded therein, each microstrip conductor being coupled to a respective one of the waveguides, and a diode detector being connected to each microstrip conductor. A solid state commutator samples the output of the detectors and provides a resultant video imaging control signal.
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Brown Peter Toby
Hille Rolf
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