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Patent US5712644A successfully refreshed from Google Patents.
US5712644A
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Microstrip antenna
Assignee: Autoilv ASP Inc
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Filing: 1996-03-29
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Granted: 1998-01-27
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Expires: 2016-03-29
Abstract
Abstract An microstrip antenna for use in a vehicle collision system is described wherein an array of rectangular patch elements are arranged in rows and columns on a substrate. A feed structure is used whereby a high gain highly efficient flat plate antenna is produced. The feed structure includes a pair of main lines to which feed points are connected. A plurality of branch lines connect at right angles to the main lines and extend alongside columns of patch elements. The patch elements are so spaced that they are electrically separated by a whole multiple of the dielectric wavelength. The main lines are connected to the branch lines by coupling traces whose widths are selected to establish a desired power distribution. A plurality of strip transformers are distributed along the main lines and connected to junctions with the branch lines to reduce reflections.
Inventors
- 👤 Frank Stan Kolak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:01
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/93; G01S13/931; H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/206; H01Q21/00; H01Q21/0006; H01Q21/0075; H01Q21/06; H01Q21/061; H01Q21/065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
An antenna comprising: a dielectric substrate on a metal plate, a microstrip structure on the substrate connected to an antenna feed point, the microstrip structure comprising; at least one corresponding main line, branch lines extending transverse to each corresponding main line, patch elements connected to respective branch lines, coupling strips extending between respective branch lines and a corresponding main line, an enlarged impedance transformer within each corresponding main line being connected to one of the coupling strips at a junction of said one of the coupling strips and a corresponding main line, said enlarged impedance transformer not being spaced upstream from said junction, and the coupling strips being of different sizes to distribute different amounts of rf power with respective branch lines.
Claim 2
Dependent Claim
122 words
An antenna comprising: a dielectric substrate on a metal plate, a microstrip structure on the substrate connected to an antenna feed point, the microstrip structure comprising; at least one corresponding main line, branch lines extending transverse to each corresponding main line, patch elements connected to respective branch lines, coupling strips extending between respective branch lines and a corresponding main line, an enlarged impedance transformer within each corresponding main line being connected to one of the coupling strips at a junction of said one of the coupling strips and a corresponding main line, said enlarged impedance transformer not being spaced upstream from said junction, and the coupling strips being of different sizes to distribute different amounts of rf power with respective branch lines.
Claim 3
Dependent Claim
20 words
An antenna as recited in claim 1 wherein, the coupling strips of different sizes comprise coupling strips of different widths.
Claim 4
Dependent Claim
16 words
An antenna as recited in claim 1 wherein, the impedance transformers are connected to respective junctions.
Claim 5
Dependent Claim
38 words
An antenna as recited in claim 1, and further comprising: connecting strips extending between respective patches and respective branch lines, and additional impedance transformers within the branch lines, the additional impedance transformers being connected to respective connecting strips.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |