US4301458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna array with impedance matching using mutual coupling
Assignee: SAC Corp
•
Filing: 1980-02-28
•
Granted: 1981-11-17
•
Expires: 2000-02-28
Abstract
Abstract A circularly polarized antenna has bays stacked at spacings of less than one wavelength in order to have a broadband SWR characteristic and to minimize radiation along a supporting mast axis. Vertical stubs are used to increase the circularity of the horizontal pattern and to improve the axial ratio.
Inventors
- 👤 McKinley R. Johns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:24
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/20; H01Q21/205; H01Q21/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
An antenna array comprising a plurality of vertically stacked bays, each bay comprising a plurality of antennas, each antenna comprising a slanted dipole and a pair of vertical stubs electrically coupled to said dipole, and means for broadbanding said array comprising the spacing between the top and bottom bays and the respective adjacent bays being about 0.76 of a wavelength, any remaining spacings between bays being about 0.82 of a wavelength.
Claim 2
Dependent Claim
71 words
An antenna array comprising a plurality of vertically stacked bays, each bay comprising a plurality of antennas, each antenna comprising a slanted dipole and a pair of vertical stubs electrically coupled to said dipole, and means for broadbanding said array comprising the spacing between the top and bottom bays and the respective adjacent bays being about 0.76 of a wavelength, any remaining spacings between bays being about 0.82 of a wavelength.
Claim 3
Dependent Claim
36 words
An array as claimed in claim 1, further comprising a conducting mast, and means for supporting said antennas horizontally spaced from said mast, said stubs being about 0.02 wavelengths closer to said mast than said dipole.
Claim 4
Dependent Claim
17 words
An antenna as claimed in claim 2, wherein said support means comprises a one quarter wavelength stub.
Claim 5
Dependent Claim
68 words
An antenna array comprising at least four stacked bays, each bay comprising a plurality of antennas, each antenna comprising a dipole and a pair of stubs electrically coupled to said dipole, and means for broadbanding said array comprising the spacing between the top and bottom bays and the respective adjacent bays being about 0.76 of a wavelength, the remaining spacings between bays being about 0.82 of a wavelength.
Claim 6
Dependent Claim
68 words
An antenna array comprising at least four stacked bays, each bay comprising a plurality of antennas, each antenna comprising a dipole and a pair of stubs electrically coupled to said dipole, and means for broadbanding said array comprising the spacing between the top and bottom bays and the respective adjacent bays being about 0.76 of a wavelength, the remaining spacings between bays being about 0.82 of a wavelength.
References Cited (Backward Citations)
US2426632A
Cited
US4031536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |