Patent US3691561A successfully refreshed from Google Patents.
US3691561A
Expired / Lapsed
US
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Antenna for direction finding systems
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1970-11-18
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Granted: 1972-09-12
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Expires: 1990-11-18
Abstract
Abstract An antenna arrangement for a shipboard direction finding system is designed to be carried on the ship mast and includes electrically parallel connected, substantially vertically polarized dipole antennas which are uniformly distributed circumferentially in a circle with their radiating elements outwardly inclined from the antenna mast and forming an angle of approximately 30* therewith. A motor controlled rotating differential condenser is connected between the dipole halves and ground to provide means for bringing the dipoles into capacitive symmetry. The antenna arrangement is adapted to be used in proximity to a mast-carried UHF direction finding antenna system through the use of two-terminal networks connected to the dipole elements.
Inventors
- 👤 Gerhard Jager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:49
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/20; H01Q21/205; G; G01; G01S; G01S3/00; G01S3/02; G01S3/04; G01S3/12; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q9/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
In a short wave antenna arrangement for producing a circular voltage pattern in direction finding systems and composed of a plurality of substantially vertically polarized and electrically parallel connected individual dipole antennas which are mounted on a mast and uniformly distributed around the circumference of a circle, the improvement wherein such individual dipole antennas are bent at their centers in such a manner that their radiating halves are directed away from the mast supporting the antenna arrangement and form an angle of approximately 30* therewith and the centers of said antennas are spaced radially from the mast, whereby said antennas are electrically decoupled from the mast.
Claim 2
Dependent Claim
106 words
In a short wave antenna arrangement for producing a circular voltage pattern in direction finding systems and composed of a plurality of substantially vertically polarized and electrically parallel connected individual dipole antennas which are mounted on a mast and uniformly distributed around the circumference of a circle, the improvement wherein such individual dipole antennas are bent at their centers in such a manner that their radiating halves are directed away from the mast supporting the antenna arrangement and form an angle of approximately 30* therewith and the centers of said antennas are spaced radially from the mast, whereby said antennas are electrically decoupled from the mast.
Claim 3
Dependent Claim
64 words
An antenna arrangement as defined in claim 1 further comprising a rotating differential condenser for balancing the dipoles as regards their capacitance with adjacent structures, including the supporting mast, the stators of said rotary differential condenser being connected with the associated dipole halves and the rotor of said condenser being connected to ground, said condenser being controlled from a remote location by motor means.
Claim 4
Dependent Claim
34 words
An anTenna arrangement as defined in claim 1 further comprising a UHF antenna carried on the mast, and two-terminal networks connected for electrically subdividing said dipole halves to decouple them from said UHF antenna.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |