Communications: radio wave antennas – Antennas – Antenna components
Reexamination Certificate
2005-03-08
2005-03-08
Font, Frank G. (Department: 2883)
Communications: radio wave antennas
Antennas
Antenna components
C343S909000
Reexamination Certificate
active
06864857
ABSTRACT:
An optically transparent dielectric reflector (200) that reflects an incident millimeter-wave beam at a design frequency. The reflector (200) includes layers of different optically transparent dielectric materials. The thickness of the individual layers is chosen so that the transmitted waves cancel almost completely in the forward direction, yielding a high degree of transmission loss and substantial reflection. In the preferred embodiment, the invention is comprised of alternating layers of optical sapphire and air. In the best mode, there are seven sapphire layers, with outer sapphire layers (50) having a nominal thickness of 70.8 mils, inner sapphire layers (52) with a nominal thickness of 30.4 mils, and air layers have a nominal thickness of 32.0 mils Vented metal spacers (54) are used to maintain optimal thickness of air layers.
REFERENCES:
patent: 5488371 (1996-01-01), Targove
patent: 5776612 (1998-07-01), Fisher
patent: 6522226 (2003-02-01), Crouch et al.
patent: 10 290109 (1998-10-01), None
Pat. Abstracts of Jap. Sumitomo Metal Ind. Ltd. Jan. 29, 1999 vol. 1999 No. 01 Abstract.
Janos W A; Synthetic dielectric material for broadvand-selective absorption and reflection: IEEE Antennas and Propagation Society International Symposium, 1995 Digest (Cat. No. 95CH35814), IEEE Antennas and Propagation.
Society International Symposium, 1995 Digest, Newport Beach, CA, USA, Jun. 18-23, 1995, pp. 1852-1855 vol. 4, XP002240014 1995, New York, HY, USA, IEEE, USA ISBN: 0-7803-2719-5 the whole document.
Crouch David D.
Dolash William E.
Alkov Leonard A.
Finn Thomas J.
Font Frank G.
Raytheon Company
Vick Karl A.
LandOfFree
Optically transparent millimeter wave reflector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optically transparent millimeter wave reflector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optically transparent millimeter wave reflector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3394381