Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1985-03-04
1987-03-24
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural separate diverse type
343781CA, 342 53, G01Q 2128, G02B 516
Patent
active
046528857
ABSTRACT:
A dual mode antenna that allows both millimeter wave and infrared radiation o enter a single aperture and propagate through a common transmission device to a point where the respective energies are divided to follow separate paths for subsequent processing. An electromagnetic transmission guide or waveguide for the system comprises a tubular waveguide member, having a beam directing lens or lenses therein, for maintianing low-loss, gaussian beam propagation of millimeter wave energy therethrough. A waveguide fiber array is coupled into or adjacent to the tubular member at one end and retrieves the infrared radiation but allows the millimeter wave radiatin to pass. Cassegrainian optics are positioned adjacent the other end of the tubular member for directing incoming millimeter and infrared energy into the guide. Subsequently, the energy impinges on the beam directing lens means that separates the respective energies, dividing them into two separate and distinct paths.
REFERENCES:
patent: 3521288 (1970-07-01), Schell
patent: 3698001 (1971-10-01), Koyama et al.
patent: 4247858 (1981-01-01), Eichweber
patent: 4282527 (1981-08-01), Winderman et al.
Green, Jr. Augustus H.
Passmore Ronald C.
Saffold James A.
Bush Freddie M.
Garvin, Jr. John C.
Lieberman Eli
The United States of America as represented by the Secretary of
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