US5572227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiband antenna system for operating at L-band, S-band and UHF-band
Assignee: Indian Space Research Organisation
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Filing: 1995-01-25
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Granted: 1996-11-05
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Expires: 2015-01-25
Abstract
Abstract A multiband antenna system for operating at L-band, S-band and UHF-band. The antenna includes L-band antenna elements and S-band antenna elements provided in the form of quadrifilar helices spaced from each other on the surface of a hollow cylindrical insulator. UHF band antenna elements are provided in the form of a cage dipole on the surface of the hollow cylindrical insulator. The L-band antenna input is connected to a first connector through an L-band feed network card. The S-band antenna input is connected to a second connector through an S-band feed network card and the UHF-band antenna input is connected to a third connector through a split sheath balun provided along the axis of the hollow cylindrical insulator.
Inventors
- 👤 Surendra Pal
- 👤 Vodralli K. Lakshmeesha
- 👤 Vaidyanathan Mahadevan
- 👤 Lourdnathan Nicholas
- 👤 Kunhambu Sadanandan
- 👤 Subramaniam Aswathnarayan
- 👤 Manickam Kumar
- 👤 Mallavalli L. Subramanya
- 👤 Venkatagiri Subrahmanya
- 👤 Changantidurga V. Subramanyam
- 👤 Thammaiahappa Mallikarjunaiah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:06
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H01Q5/00; H01Q5/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A multiband antenna system for operating at L-band, S-band and UHF-band comprising L-band antenna elements and S-band antenna elements provided in the form of quadrifilar helices spaced from each other on the surface of a hollow cylindrical insulator; UHF band antenna elements provided in the form of a cage dipole on the surface of the said hollow cylindrical insulator; art L-band antenna input being connected to a first connector through an L-band feed network card; art S-band antenna input being connected to a second connector through an S-band feed network card and a UHF-band antenna input being connected to a third connector through a split sheath balun provided along the longitudinal axis of said hollow cylindrical insulator.
Claim 2
Dependent Claim
117 words
A multiband antenna system for operating at L-band, S-band and UHF-band comprising L-band antenna elements and S-band antenna elements provided in the form of quadrifilar helices spaced from each other on the surface of a hollow cylindrical insulator; UHF band antenna elements provided in the form of a cage dipole on the surface of the said hollow cylindrical insulator; art L-band antenna input being connected to a first connector through an L-band feed network card; art S-band antenna input being connected to a second connector through an S-band feed network card and a UHF-band antenna input being connected to a third connector through a split sheath balun provided along the longitudinal axis of said hollow cylindrical insulator.
Claim 3
Dependent Claim
22 words
The multiband antenna system as claimed in claim 1, wherein said antenna elements and said feed networks are enclosed in a radome.
Claim 4
Dependent Claim
33 words
The multiband antenna system as claimed in claim 1, wherein the L-band, S-band and UHF-band antenna inputs are connected to first, second and third connectors respectively by means of semi rigid coaxial cables.
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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) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |