Title:
MULTI-BEAM SATELLITE ANTENNA FOR CELLULAR COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3452870
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-beam satellite antenna structure including a means that emulates a feed of a large size into a microwave feed of a small size.
SOLUTION: A side lobe is reduced and fast roll-off in a main lobe is generated by providing a surface reflectance ratio with a taper in the reflection surface of a parabolic reflector 1 in a parabolic antenna using resistance material 9, the use of an antenna composed of microwave feeds 3, 5 and 7 whose diameters are smaller which is requested by an antenna that does not have a surface reflectance ratio with a taper is made possible, and the antenna is effectively emulated. A plurality of feeds can adjacently be arranged in order to form a multi-beam antenna generating adjacent beam patterns as a result of a relatively small feed diameter. A multi-beam antenna for satellite cellular communication enables a wider area of the earth to be receivable.
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Inventors:
Charles W. Chandler
Application Number:
JP2000198793A
Publication Date:
October 06, 2003
Filing Date:
June 30, 2000
Export Citation:
Assignee:
TRW INCORPORATED
International Classes:
B64G1/66; H01Q1/28; H01Q15/14; H01Q19/02; H01Q25/00; H04B7/185; H04B7/204; (IPC1-7): H01Q15/14; H01Q1/28; H04B7/185; H04B7/204
Domestic Patent References:
| JP52107752A | ||||
| JP632408A |
Other References:
【文献】米国特許4342036(US,A)
【文献】米国特許5134423(US,A)
【文献】特許2980841(JP,B2)
【文献】米国特許5134423(US,A)
【文献】特許2980841(JP,B2)
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)