Patent US2220299A successfully refreshed from Google Patents.
Patent US5572227A successfully refreshed from Google Patents.
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 20:15
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.
References Cited (Backward Citations)
US4008479A
Cited
US4011567A
Cited
DE3017169A1
Cited
US4302760A
Cited
FR2570546A1
Cited
EP0427654A1
Cited
US5255005A
Cited
FR2667988A1
Cited
US5138331A
Cited
US5343173A
Cited
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 |