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 Title: |
US5905466:
Terrestrial antennas for satellite communication system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Jha, Asu Ram; Cerritos, CA
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| Assignee: |
Teledesic LLC, Kirkland, WA
other patents from TELEDESIC LLC (746777) (approx. 21)
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| Published / Filed: |
1999-05-18
/ 1997-07-08
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| Application Number: |
US1997000889409
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| IPC Code: |
Advanced:
H01Q 1/24;
H01Q 21/06;
H01Q 21/20;
H04B 7/185;
Core:
more...
IPC-7:
H01Q 1/24;
H01Q 1/3/8;1/24;
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| ECLA Code: |
H01Q1/24A1; H01Q1/24A1A1; H01Q21/06B3; H01Q21/20B; H04B7/185M18B;
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| U.S. Class: |
Current:
343/700.MS;
343/702;
343/754;
Original:
343/700.MS;
343/702;
343/754;
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| Field of Search: |
343/700 MS,702,754,778,853
342/371,372,373,374,375
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| Priority Number: |
| 1997-07-07 |
US1997000889409 |
| 1992-12-02 |
US1992000984609 |
| 1991-11-08 |
US1991000790273 |
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| Abstract: |
Terrestrial antennas (10A, 10B, 10C and 10D) which are capable of transmitting and receiving radio signals directly to and from satellites in low Earth orbit are disclosed. The preferred embodiment of the invention employs circularly polarized, dual-frequency printed circuit antenna elements (136) measuring only a fraction of an inch in diameter. One embodiment (10A) includes an elevation array and an azimuth array which both reside on a trapezoidal, semi-conical housing that resembles a flattened pyramid. Both the top and the curved exterior of the pyramid support circular, slotted, printed circuit patches on their surfaces which bound individual radiating antenna elements (18). Since the entire antenna is only a few inches in diameter and is less than two inches high, it can be incorporated as an integral element of a telephone (T) or can be mounted at the end of a collapsible mast (CM). Other embodiments (10B, 10C, and 10D) of the invention employ hemispherical, cylindrical, and truncated hemispherical configurations. These unique antennas permit direct communication with satellites in low Earth orbit using the 20 and 30 GHz frequency bands. The antennas (10A, 10B, 10C and 10D) and their associated circuitry are sufficiently powerful to provide dependable service virtually anywhere on land, sea or in the air.
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| Attorney, Agent or Firm: |
Seed & Berry LLP ;
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| Primary / Asst. Examiners: |
Wong, Don; Ho, Tan
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| Maintenance Status: |
CC Certificate of Correction issued
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| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
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| Parent Case: |
CLAIM FOR PRIORITY
The present application is a continuation of U.S. application Ser. No. 07/984,609, filed on Dec. 2, 1992, now U.S. Pat. No. 5,560,788, which is a continuation-in-part of U.S. application Ser. No. 07/790,273, filed Nov. 8, 1991, now abandoned.
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| Designated Country: |
BB BG BR CA CS FI HU JP KP KR LK LU MG MN MW NO OA PL RO RU SD UA BE CH DK ES FR GB GR IE IT LI NL SE
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| Family: |
Show 9 known family members
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First Claim:
Show all 5 claims |
What is claimed is:
1. An apparatus for use with a satellite communication device which is capable of communicating directly with a satellite in Earth orbit comprising:
- an antenna surface being generally hemispherical in shape and capable of transmitting and receiving radio beams to and from said satellite in Earth orbit;
- said antenna surface being capable of steering radio beams in an azimuth dimension and in an elevation dimension; and
- a plurality of phased-array antenna elements disposed along said antenna surface, said phased-array elements each including upper and lower conducting surfaces separated by an insulating layer, said upper conducting surface being sized to operate at a first predetermined frequency and said lower conducting surface being sized to operate at a second predetermined frequency different from said first predetermined frequency.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 11 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other Abstract Info: |
DERABS G1997-384817
DERABS G1999-346611
DERABS G1999-346611
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| Other References: |
European Patent Application No. 92304879.7, May 28, 1992, H. Iwasaki et al.
"Beamforming Devices and Feed Structures for a DBS Flat-Plate Antenna," S. Wakeling, BBC Research Department Report No. 12, 1989, pp. 1-12.
"Land Vehicle Antennas for Satellite Mobile Communications," H.A. Haddad et al., IEEE Globecom '85, Dec. 1985, pp. 1172-1176.
"Basic Theoretical Aspects of Spherical Phased Arrays," H.E. Schrank, Phased Array Antennas. Ed. A. Oliner et al., Artech Hse. Jun. '70, pp. 323-327.
"A 20/30 GHz Personal Access Satellite System Design," P. Estabrook et al., IEEE Int'l Conference on Communications, Jun. 1989, pp. 0126-0222.
"MAGNAPhone" brochure, Magnavox Nav-Com. Inc. (Date is not provided).
"Desert Storm Demand Buffets Satellite-Phone Firm," M. Robichaux & G. Fuchsberg, Feb. 1, 1991, B2.
"Microstrip Patch Array with Multiple Beams," P.S. Hall & S.J. Vetterlein 19th European Microwave Conference, Sep. 1989, pp. 343-348.
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