US3939477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quadrupole adcock direction finder and antenna therefor
Assignee: Southwest Research Institute
•
Filing: 1973-04-06
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Granted: 1976-02-17
•
Expires: 1993-04-06
Abstract
Abstract A plurality of dipoles is arranged and connected to form a quadrupole Adcock Antenna system which is connected with direction finding circuitry to define a direction finder system of which two embodiments are disclosed. The system responds to any transmitter to be located.
Inventors
- 👤 Terence C. Green
- 👤 William G. Guion
- 👤 Douglas N. Travers
- 👤 William M. Sherrill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:38
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q21/12; H01Q21/14; G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/16; G01S3/22
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
43 words
An antenna system comprising a plurality of dipole elements arranged as an electric field sampling antenna system, wherein output signals of said dipole elements are summed into two groups such that the signal difference of said two groups forms a quadrupole azimuth response.
Claim 2
Dependent Claim
43 words
An antenna system comprising a plurality of dipole elements arranged as an electric field sampling antenna system, wherein output signals of said dipole elements are summed into two groups such that the signal difference of said two groups forms a quadrupole azimuth response.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein matched network circuit means are connected to individual dipoles, and are also connected to a summing network circuit means to provide an antenna output signal.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 wherein the number of dipoles is four N where N is a whole positive integer.
Claim 5
Dependent Claim
37 words
The apparatus of claim 1 wherein four or more similar dipole elements are cross-connected with one another to provide two signal sums, and the signal difference of the two signal sums represents the quadrupole antenna output signal.
Claim 6
Dependent Claim
37 words
The apparatus of claim 1 wherein eight antenna elements are arranged as four vertically oriented dipoles with their respective centers in a common plane and located at 90° points around a central axis of the antenna system.
Claim 7
Dependent Claim
47 words
The apparatus of claim 1 wherein the antenna system forms an output signal given by E = E v max sin 3 θ cos 2φ, where φ is the azimuthal angle, θ is the incidence angle, and E v is the vertical component of the incident signal.
Claim 8
Dependent Claim
62 words
The apparatus of claim 1 including a first and a second such antenna system which share a common electrical phase center and the second antenna system is offset from the first antenna system by a specified azimuth angle to define a direction finding system utilizing sin 2φ and cos 2φ signals formed by such antenna systems where φ is the azimuth angle.
Claim 9
Dependent Claim
26 words
The apparatus of claim 7 where said first and second antenna systems include a common electrical phase center and are azimuthally oriented 45° from one another.
Claim 10
Dependent Claim
19 words
The apparatus of claim 8 where said first and second antenna systems have their respective electrical phase centers separated.
Claim 11
Dependent Claim
11 words
The apparatus of claim 1 including four spaced, dipole antenna elements.
Claim 12
Dependent Claim
52 words
The apparatus of claim 10 wherein said dipole antenna elements are split at their respective midpoints and a conductor means is connected to each half of said elements, said conductor means being connected to a pair of summing circuits which form cumulative output signals which are then supplied to a difference circuit.
Claim 13
Dependent Claim
18 words
The apparatus of claim 10 wherein said dipole elements are arranged at 90° intervals about a reference axis.
Claim 14
Dependent Claim
111 words
The apparatus of claim 1 including four vertical dipole elements arranged at 0°, 90°, 180° and 270° with respect to a reference, and said dipoles are divided at their midpoints to define halves of the dipole elements and the halves are respectively denoted as 1 and 2, 3 and 4, 5 and 6, and 7 and 8, from top to bottom, and a summing circuit sums signals from the halves 1, 4, 5 and 8, and a second summing circuit sums signals from the halves 2, 3, 6 and 7, and a difference circuit is connected to both of said summing circuits and forms an output related to the difference therein.
Claim 15
Dependent Claim
28 words
The apparatus of claim 10 wherein the diametrical spacing of said dipole elements arranged in a square is up to 21/2 times the longest wave length of interest.
Claim 16
Dependent Claim
16 words
The apparatus of claim 10 wherein said dipole elements are spaced at corners of a square.
Claim 17
Dependent Claim
24 words
The apparatus of claim 1 including four groups of two dipole elements each, said two dipole elements being connected and arranged in parallel sum.
Claim 18
Dependent Claim
18 words
The apparatus of claim 16 where said four groups are arranged at 90° intervals about a reference axis.
Claim 19
Dependent Claim
28 words
The apparatus of claim 17 wherein said four groups each have two output conductors which are connected in such a manner as to form a quadrupole Adcock antenna.
Claim 20
Dependent Claim
72 words
The apparatus of claim 1 including two such antenna systems arranged relative to a reference axis such that one forms output signals which are a function of cos2φsin 3 θ and the other forms output signals which are a function of sin2φsin 3 θ where φto is the azimuth and θ is the incidence angle of a target of interest and said antenna systems respond passively to some broadcast from such target.
Claim 21
Dependent Claim
22 words
The apparatus of claim 19 including additional antenna means forming output signals which are a function of sine φ and cosine φ.
Claim 22
Dependent Claim
43 words
The apparatus of claim 20 wherein four antenna systems have an electrical phase center separated vertically or horizontally and where the quadrupole antenna systems are azimuthally oriented 45° from one another and the dipole antenna systems are azimuthally oriented 90° from one another.
Claim 23
Dependent Claim
28 words
The apparatus of claim 19 including a direction finding display means operatively connected to said antenna means for forming an indication of such a target and its azimuth.
Claim 24
Dependent Claim
27 words
The apparatus of claim 19 including a goniometer means provided with the outputs thereof, and said means forms an indication of the bearing of such a target.
Claim 25
Dependent Claim
61 words
The apparatus of claim 20 including goniometer means provided with the signals which are a function of sine 2φ and cosine 2φ, and a second goniometer means provided with the signals which are a function of sine φ and cosine φ, and circuit means connected to both of said goniometer means for forming an indication of azimuth of such a target.
Claim 26
Dependent Claim
13 words
The apparatus of claim 24 wherein said circuit means includes a display means.
Claim 27
Dependent Claim
30 words
The apparatus of claim 19 including a dual channel receiver means provided with the antenna outputs thereof, and said means forms an indication of the bearing of such a target.
Claim 28
Dependent Claim
53 words
The apparatus of claim 26 including antenna sequencing relays provided with the signals which are a function of sin 2φ, cos 2φ, sin φ, and cos φ, and circuit means connected to said dual channel receiver means and logic sense detector means for forming an indication of the azimuth of such a target.
Claim 29
Dependent Claim
13 words
The apparatus of claim 27 where said circuit means includes a display means.
Claim 30
Dependent Claim
12 words
The apparatus of claim 1 including means for rotating said antenna system.
Claim 31
Dependent Claim
27 words
The apparatus of claim 29 including a generally vertical shaft on which said antenna system is supported and further including a motive means for rotating said shaft.
Claim 32
Dependent Claim
20 words
The apparatus of claim 29 including a dipole Adcock antenna cooperatively supported with parallel axis relative to said antenna system.
Claim 33
Dependent Claim
14 words
The apparatus of claim 30 including a dipole Adcock antenna mounted on said shaft.
Claim 34
Dependent Claim
19 words
The apparatus of claim 32 wherein said dipole Adcock antenna is azimuthally oriented wth respect to said antenna system.
Claim 35
Dependent Claim
34 words
The apparatus of claim 33 wherein said dipole Adcock antenna and said antenna system are connected to a summing means which is in turn connected to an amplifier means and to an output means.
Claim 36
Dependent Claim
17 words
The apparatus of claim 1 wherein said antenna system response to horizontally polarized radiation is substantially zero.
Claim 37
Dependent Claim
13 words
The apparatus of claim 1 wherein said antenna system includes vertical dipole elements.
Claim 38
Dependent Claim
16 words
The apparatus of claim 36 wherein said dipole elements are mounted and movable as a group.
Claim 39
Dependent Claim
46 words
An antenna system comprised of dipole elements which are constructed and arranged to form an output signal given by E = e max sin 3 θ cos 2φ Where E max = vertically polarized portion of incident radiation θ = incidence angle φ = azimuth angle
Claim 40
Dependent Claim
46 words
An antenna system comprised of dipole elements which are constructed and arranged to form an output signal given by E = e max sin 3 θ cos 2φ Where E max = vertically polarized portion of incident radiation θ = incidence angle φ = azimuth angle
Claim 41
Dependent Claim
62 words
The apparatus of claim 1 including two such quadrupole antenna systems arranged relative to a referenced axis and connected to a summation and difference circuit means to provide sin 2φ, cos 2φ, sin φ, and cos φ antenna functions where φ is the azimuth of a target of interest and said antenna systems respond passively to some broadcast from such a target.
References Cited (Backward Citations)
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US2953782A
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US3329954A
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US3490024A
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |