Communications: radio wave antennas – Antennas – Wave guide type
Patent
1994-06-22
1996-09-17
Le, Hoanganh
Communications: radio wave antennas
Antennas
Wave guide type
343753, 343909, 343DIG2, H01Q 1914
Patent
active
055572928
ABSTRACT:
An antenna has one feed for an S-band electromagnetic signal, and a second feed constructed as an array of radiators to service two C-band signal channels. A subreflector having a microwave frequency selective surface (FSS) is placed in front of a main reflector. The C-band feed is constructed of an array of square aperture horns joined by separate transmit and receive barline beam-forming networks, and a meanderline polarizer to produce circularly polarized radiation patterns. Tapered ridges extend longitudinally along inner wall surfaces of each of the horns to provide increased bandwidth to the C-band feed. The frequency selective surface is constructed, typically, of a generally planar substrate of material transparent to electromagnetic radiation, and numerous metallic, generally annular, radiating elements, or resonators, arranged on the substrate in an array of repeating nested sets of the radiating elements. The lower frequency S-band feed is located behind and to the side of the subreflector for transmission of radiation via a folded optical path to the main reflector. The C-band feed is located in front of and to the side of the subreflector for transmission of radiation along a straight path through the FSS to the main reflector. The locating of the two feeds to the side of the subreflector permits the subreflector to be stowed by folding down upon the C-band feed, and the main reflector to be stowed by folding down upon both the S-band feed and the stowed subreflector.
REFERENCES:
patent: 3395059 (1968-07-01), Butler et al.
patent: 4387377 (1983-06-01), Kandler
patent: 4562441 (1985-12-01), Beretta et al.
patent: 5086304 (1992-02-01), Collins
patent: 5258771 (1993-11-01), Praba
patent: 5373302 (1994-12-01), Wu
J. Huang et al., "Tri-Band Frequency Selective Surface With Circular Ring Elements", 91CH3036-1/0000-0204 $1.00, 1991 IEEE, pp. 204-207.
Barkeshli Sina
Ersoy Levent
Jakstys Vito J.
Lord Peter W.
Nygren Evert C.
Le Hoang-anh
Space Systems Loral, Inc.
LandOfFree
Multiple band folding antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiple band folding antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple band folding antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-416387