Device and method for separating short-wavelength and long-wavel

Details Device and method for separating short-wavelength and long-wavel Device and method for separating short-wavelength and long-wavel

1986-09-30

1988-07-26

Sikes, William L.

Communications: radio wave antennas

Antennas

Wave guide type

343772, 343783, 333126, H01Q 1300, H01P 1213

Patent

active

047604042

ABSTRACT:
A device for separating signals in the long or radar wavelength bands from signals in the short or infrared to ultraviolet wavelength bands which occupy a common area. A waveguide for directing radar band wavelengths has apertures in opposing walls of the waveguide, a first of which is rectangular and has a greater length and width than the broadwall dimesnion of the waveguide; and the other of which is circular with a diameter less than one-half the free space wavelength of the long wavelength signal. A pyramidal feedhorn directs the long signal wavelength through the reactangular aperture, where the short-wavelength signal, which also comes down through the feedhorn passes through the second aperture. The long-wavelength component instead of passing through the second aperture is deflected into the waveguide. A short-wavelength detector is positioned at the point of convergence of a ray cone passing through the first and second apertures, thus making the detected signal available for further signal processing.

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