US3789416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shortened turnstile antenna
Assignee: TDK Micronas GmbH
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Filing: 1972-04-20
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Granted: 1974-01-29
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Expires: 1992-04-20
Abstract
Abstract An electrically short turnstile type antenna array which effectively provides vertical or overhead right or left hand circularly polarized coverage in for example satellite communications from a very restricted space volume as characterized particularly in submarine or aircraft antennas. A pair of electrically short dipoles are arranged normal to each other with the axes thereof intersecting at their mid-points. Coaxially arranged about each leg of these dipoles is an openended cylindrical sleeve. The feed to the array is by way of a coaxial cable running to the inside of the coaxial cavity formed by one of the sleeves in an end-feed orientation. A mutual coupling link couples signal energy from the inside of the fed coaxial cavity to the inside of one of the coaxial cavities associated with the other dipole. The entire array is mounted on a support mast less than one-eighth lambda from the horizontal base portion of a tin can-shaped ground plane whose vertical sides are sufficiently high to substantially house the array.
Inventors
- 👤 J Kuecken
- 👤 M Polgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/26; H01Q13/00; H01Q13/10; H01Q13/18
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
142 words
A shortened turnstile type antenna arrangement, comprising: a. a pair of electrically short dipole antennas arranged normal to each other with the axes thereof intersecting at their midpoints; b. a pair of open-ended cylindrical sleeves associated with each of said dipoles and for resonating same, said sleeves having predetermined equal lengths in electrical degrees relative to the intended operating resonant frequency of the antenna arrangement, and each of said sleeves being arranged to surround a predetermined portion of said associated dipole, forming thereby a coaxial cavity; c. antenna feed means for coupling signal energy to the inside of one coaxial cavity associated with at least one of said dipoles; and d. mutual coupling link means for coupling signal energy from said one coaxial cavity associated with said one dipole to one of said coaxial cavities associated with the other of said dipoles.
Claim 2
Dependent Claim
142 words
A shortened turnstile type antenna arrangement, comprising: a. a pair of electrically short dipole antennas arranged normal to each other with the axes thereof intersecting at their midpoints; b. a pair of open-ended cylindrical sleeves associated with each of said dipoles and for resonating same, said sleeves having predetermined equal lengths in electrical degrees relative to the intended operating resonant frequency of the antenna arrangement, and each of said sleeves being arranged to surround a predetermined portion of said associated dipole, forming thereby a coaxial cavity; c. antenna feed means for coupling signal energy to the inside of one coaxial cavity associated with at least one of said dipoles; and d. mutual coupling link means for coupling signal energy from said one coaxial cavity associated with said one dipole to one of said coaxial cavities associated with the other of said dipoles.
Claim 3
Dependent Claim
47 words
The arrangement according to claim 1 wherein said antenna feed means includes a coaxial feed cable having one of its conducting paths coupled to the inner surface of said sleeve forming said one coaxial cavity with said one dipole a predetermined distance from the one dipole end.
Claim 4
Dependent Claim
98 words
The arrangement according to claim 1 wherein said mutual coupling link means includes a coaxial signal energy transmission cable having the conducting paths at the one end thereof coupled respectively to said one dipole a predetermined distance from said one end thereof and inside the coaxial cavity associated therewith and to the inner surface of the sleeve forming said associated coaxial cavity, and the conducting paths at the other end of said signal energy transfer cable being likewise coupled to said other dipole and to the inner surface of one of said coaxial cavity forming sleeves associated therewith.
Claim 5
Dependent Claim
38 words
The arrangement according to claim 3 wherein said mutual coupling link means extends within the coaxial cavities associated therewith and is of predetermined length in electrical degrees relative to the intended resonant frequency operation of the antenna arrangement.
Claim 6
Dependent Claim
32 words
The arrangement according to claim 3 wherein said predetermined distance of the coupling of each end of said mutual coupling link from said associated one end of each said dipole is variable.
Claim 7
Dependent Claim
28 words
The arrangement according to claim 3 wherein said predetermined length of each of said sleeves approximates one-half the length of the dipole antenna to which it is associated.
Claim 8
Dependent Claim
14 words
The arrangement according to claim 6 wherein said sleeves are end loaded to resonate.
Claim 9
Dependent Claim
28 words
The arrangement according to claim 6 wherein said dipoles are comprised of rigid coaxial cable of predetermined length in electrical degrees relative to the intended resonant frequency operation.
Claim 10
Dependent Claim
43 words
The arrangement according to claim 3 wherein said antenna feed means includes a coaxial feed cable having one of its conducting paths coupled to the inner surface of said sleeve forming said one coaxial cavity said predetermined distance from the one dipole end.
Claim 11
Dependent Claim
26 words
The arrangement according to claim 9 wherein said predetermined distance of said coupled coaxial feed cable from the one end of said one dipole is variable.
Claim 12
Dependent Claim
41 words
The arrangement according to claim 3 further comprising a ''''tin can-shaped'''' ground plane in the form of a horizontal conductive surface arranged under the antenna arrangement and having a vertical hollow cylindrical portion extending upward therefrom to house said antenna arrangement.
Claim 13
Dependent Claim
26 words
The arrangement according to claim 11 wherein the height of said dipoles above said horizontal portion of said ground plane is less than one-eighth lambda .
Claim 14
Dependent Claim
50 words
The arrangement according to claim 3 wherein said antenna feed means includes a quadrature hybrid having the 0* port thereof coupled to one dipole and the 90* port thereof coupled to the other dipole, whereby the signal energy of the latter is 90* in phase relative to the one dIpole.
Claim 15
Dependent Claim
17 words
The arrangement according to claim 7 wherein said end loads are position-adjustable to provide additional tuning capability.
Claim 16
Dependent Claim
146 words
In a turnstile type antenna configuration which includes a pair of dipole antennas arranged normal to each other, each of which is coaxially arranged within a pair of open-ended cylindrical sleeves positioned substantially end-to-end, a feed coupling arrangement comprising a feed cable coupled to one of the dipoles and to the inner surface of one of the coaxial sleeves associated therewith a predetermined distance from the end of said one dipole, so as to provide coupling of the excitation energy to the coaxial cavity formed by said sleeve from the inside, and further including a mutual coupling link cable at one end to said one dipole and said one coaxial sleeve on the inside of the coaxial cavity formed thereby, and likewise coupled at the other end thereof to the other dipole and to one of the sleeves associated therewith inside the coaxial cavity formed thereby.
Claim 17
Dependent Claim
146 words
In a turnstile type antenna configuration which includes a pair of dipole antennas arranged normal to each other, each of which is coaxially arranged within a pair of open-ended cylindrical sleeves positioned substantially end-to-end, a feed coupling arrangement comprising a feed cable coupled to one of the dipoles and to the inner surface of one of the coaxial sleeves associated therewith a predetermined distance from the end of said one dipole, so as to provide coupling of the excitation energy to the coaxial cavity formed by said sleeve from the inside, and further including a mutual coupling link cable at one end to said one dipole and said one coaxial sleeve on the inside of the coaxial cavity formed thereby, and likewise coupled at the other end thereof to the other dipole and to one of the sleeves associated therewith inside the coaxial cavity formed thereby.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |