US3719950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna system for vhf and uhf radio direction finders
Assignee: Individual
•
Filing: 1971-11-03
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Granted: 1973-03-06
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Expires: 1991-11-03
Abstract
Abstract An antenna system for a VHF and UHF radio direction finder comprises a loop antenna formed by turns which are arranged on an elongated magnetodielectric core. The antenna system has also an omnidirectional antenna member and a switch means which shapes the resultant directivity pattern by adding up signals from the loop and omnidirectional antennas and changing the position of this pattern discretely by 180* in the horizontal plane to obtain its mirror image. The omnidirectional antenna is made in the form of a closed turn arranged on the core of the loop antenna so that it is substantially perpendicular to the turns of the loop antenna. A portion of the closed turn is disposed in the direction of the longitudinal axis of the core is elevated above the core surface through a known distance whereby the magnitude of the signal from the omnidirectional antenna is such that the two resultant directivity patterns of the antenna system intersect only at two points in a horizontal plane.
Inventors
- 👤 A Bukhman
- 👤 E Drovenkov
- 👤 F Ivaschenko
- 👤 A Aizenshtein
- 👤 I Yanushkevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:42
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/29; G; G01; G01S; G01S3/00; G01S3/02; G01S3/04; G01S3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
An antenna system for a VHF and UHF radio direction finder comprising: a loop antenna having a core member with a longitudinal axis, and turns of said loop antenna wound on said core member so as to be spaced along said longitudinal axis ; an omnidirectional antenna which includes an elongated conductor disposed to lie in a plane substantially perpendicular to said turns of the loop antenna, said plane passing through the longitudinal axis of said core member; a switch means for shaping a resultant directivity pattern by adding up signals from said loop antenna and said omnidirectional antenna and varying the position of said directivity pattern discretely by 180* in a horizontal plane to obtain a mirror image of said directivity pattern; conductor means for forming a closed turn of said omnidirectional antenna disposed on said core member, a portion of said closed turn being located along said longitudinal axis and elevated above the core surface through a known distance whereby said directivity pattern and said mirror image thereof intersect only at two points in a horizontal plane.
Claim 2
Dependent Claim
179 words
An antenna system for a VHF and UHF radio direction finder comprising: a loop antenna having a core member with a longitudinal axis, and turns of said loop antenna wound on said core member so as to be spaced along said longitudinal axis ; an omnidirectional antenna which includes an elongated conductor disposed to lie in a plane substantially perpendicular to said turns of the loop antenna, said plane passing through the longitudinal axis of said core member; a switch means for shaping a resultant directivity pattern by adding up signals from said loop antenna and said omnidirectional antenna and varying the position of said directivity pattern discretely by 180* in a horizontal plane to obtain a mirror image of said directivity pattern; conductor means for forming a closed turn of said omnidirectional antenna disposed on said core member, a portion of said closed turn being located along said longitudinal axis and elevated above the core surface through a known distance whereby said directivity pattern and said mirror image thereof intersect only at two points in a horizontal plane.
Claim 3
Dependent Claim
179 words
An antenna system for a VHF and UHF radio direction finder comprising: a loop antenna having a core member with a longitudinal axis, and turns of said loop antenna wound on said core member so as to be spaced along said longitudinal axis ; an omnidirectional antenna which includes an elongated conductor disposed to lie in a plane substantially perpendicular to said turns of the loop antenna, said plane passing through the longitudinal axis of said core member; a switch means for shaping a resultant directivity pattern by adding up signals from said loop antenna and said omnidirectional antenna and varying the position of said directivity pattern discretely by 180* in a horizontal plane to obtain a mirror image of said directivity pattern; conductor means for forming a closed turn of said omnidirectional antenna disposed on said core member, a portion of said closed turn being located along said longitudinal axis and elevated above the core surface through a known distance whereby said directivity pattern and said mirror image thereof intersect only at two points in a horizontal plane.
Claim 4
Dependent Claim
179 words
An antenna system for a VHF and UHF radio direction finder comprising: a loop antenna having a core member with a longitudinal axis, and turns of said loop antenna wound on said core member so as to be spaced along said longitudinal axis ; an omnidirectional antenna which includes an elongated conductor disposed to lie in a plane substantially perpendicular to said turns of the loop antenna, said plane passing through the longitudinal axis of said core member; a switch means for shaping a resultant directivity pattern by adding up signals from said loop antenna and said omnidirectional antenna and varying the position of said directivity pattern discretely by 180* in a horizontal plane to obtain a mirror image of said directivity pattern; conductor means for forming a closed turn of said omnidirectional antenna disposed on said core member, a portion of said closed turn being located along said longitudinal axis and elevated above the core surface through a known distance whereby said directivity pattern and said mirror image thereof intersect only at two points in a horizontal plane.
References Cited (Backward Citations)
US3495264A
Cited
US3588900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |