US3742510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multimode discone antenna
Assignee: TDK Micronas GmbH
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Filing: 1971-02-12
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Granted: 1973-06-26
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Expires: 1991-02-12
Abstract
Abstract A turnstile antenna includes four arms disposed concentric of a vertical axis and orthogonally related to each other so that diagonally related arms form a dipole. The four arms are physically and electrically coupled to a circular member disposed coaxially of the vertical axis. The four arms extend downward at an angle less than 90* with respect to the vertical axis. The pair of dipoles have a first energy coupling arrangement for orthogonal energy coupled to adjacent orthogonal arms to provide right and left hand circularly polarized omnidirectional patterns. A cylinder disposed coaxially of the vertical axis and spaced from the circular member extends through the turnstile antenna to support a disc therefrom in a perpendicular relation to the vertical axis and above the turnstile antenna. A second energy coupling arrangement for inphase energy is coupled to the disc and diagonally disposed arms of the turnstile antenna. The thusly formed combination provides a discone antenna having a vertically polarized omnidirectional pattern. Two variations of both the first and second energy coupling arrangements are disclosed.
Inventors
- 👤 W Spanos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:51
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q21/00; H01Q21/24; H01Q25/00; H01Q25/001
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
168 words
A multimode antenna capable of having simultaneously a vertically polarized ommidirectional pattern, a right hand circularly polarized omnidirecTional pattern and a left hand circularly polarized omnidirectional pattern comprising: a turnstile antenna having four arms disposed orthogonally about a vertical axis, portions of said arms extending downward at a given angle less than 90* with respect to said vertical axis, diagonally related ones of said arms forming a dipole, a circular member disposed coaxially of said vertical axis to physically and electrically interconnect said arms, and first energy coupling means coupled to orthogonally related adjacent ones of said arms to feed orthogonal energy to and remove orthogonal energy from said turnstile antenna; a disc disposed in perpendicular relation to said vertical axis; first means to physically support said disc above said turnstile antenna; and second energy coupling means coupled to diagonally related ones of said arms and said disc to feed inphase energy to and remove inphase energy from a discone antenna formed by said disc and said arms.
Claim 2
Dependent Claim
168 words
A multimode antenna capable of having simultaneously a vertically polarized ommidirectional pattern, a right hand circularly polarized omnidirecTional pattern and a left hand circularly polarized omnidirectional pattern comprising: a turnstile antenna having four arms disposed orthogonally about a vertical axis, portions of said arms extending downward at a given angle less than 90* with respect to said vertical axis, diagonally related ones of said arms forming a dipole, a circular member disposed coaxially of said vertical axis to physically and electrically interconnect said arms, and first energy coupling means coupled to orthogonally related adjacent ones of said arms to feed orthogonal energy to and remove orthogonal energy from said turnstile antenna; a disc disposed in perpendicular relation to said vertical axis; first means to physically support said disc above said turnstile antenna; and second energy coupling means coupled to diagonally related ones of said arms and said disc to feed inphase energy to and remove inphase energy from a discone antenna formed by said disc and said arms.
Claim 3
Dependent Claim
25 words
An antenna according to claim 1, wherein said first means includes a cylinder disposed coaxially of said vertical axis and spaced from said circular member.
Claim 4
Dependent Claim
167 words
An antenna according to claim 2, wherein said second energy coupling means includes a first coaxial line disposed coaxially of and extending through said cylinder to a given point above said disc, power divider means coupled to said first coaxial line at said given point, a second coaxial line coupled to said power divider means and extending to a first point on said disc adjacent one of said diagonally related ones of said arms, the center conductor of said second coaxial line extending through said disc at said first point and making electrical contact with said one of said diagonally related ones of said arms, and a third coaxial line coupled to said power divider means and extending to a second point on said disc adjacent the other of said diagonally related ones of said arms, the center conductor of said third coaxial line extending through said disc at said second point and making electrical contact with said other of said diagonally related ones of said arms.
Claim 5
Dependent Claim
77 words
An antenna according to claim 3, wherein said first coaxial line has a 50 ohm characteristic impedance; said power divide means is a shunt power divider; said second coaxial line has a 100 ohm characteristic impedance and a length of one quarter wavelength at the operating frequency of said discone antenna; and said third coaxial line has a 100 ohm characteristic impedance and a length of one quarter wavelength at the operating frequency of said discone antenna.
Claim 6
Dependent Claim
147 words
An antenna according to claim 2, wherein said second energy coupling means includes a first coaxial line disposed below said turnstile antenna, power divider means coupled to said first coaxial line below said turnstile antenna, a second coaxial line coupled to said power divider means and extending upward substantially parallel to said cylinder to one of said diagonally related ones of said arms, the center conductor of said second coaxial line extending through said one of said diagonally related ones of said arms and making electrical contact with said disc, and a third coaxial line coupled to said power divider means and extending upward substantially parallel to said cylinder to the other of said diagonally related ones of said arms, the center conductor of said third coaxial line extending through said other of said diagonally related ones of said arms and making electrical contact with said disc.
Claim 7
Dependent Claim
77 words
An antenna according to claim 5, wherein said first coaxial line has a 50 ohm characteristic impedance; said power divider means is a shunt power divider; said second coaxial line has a 100 ohm characteristic impedance and a length of three quarter wavelength at the operating frequency of said discone antenna; and said third coaxial line has a 100 ohm charActeristic impedance and a length of three quarter wavelength at the operating frequency of said discone antenna.
Claim 8
Dependent Claim
104 words
An antenna according to claim 5, further including at least a first member disposed one quarter wavelength at the operating frequency of said discone antenna below said turnstile antenna electrically connecting said cylinder and the outer conductor of said second coaxial line, and a second member disposed one quarter wavelength at the operating frequency of said discone antenna below said turnstile antenna electrically connecting said cylinder and the outer conductor of said third coaxial line, said first and second members providing at least a part of a one quarter wavelength choke for energy on said cylinder at the operating frequency of said discone antenna.
Claim 9
Dependent Claim
151 words
An antenna according to claim 2, wherein said first energy coupling means includes a first coaxial line having a first portion extending upward toward one of said orthogonally related adjacent ones of said arms substantially parallel to said cylinder, and a second portion coupled to and extending at substantially right angles to said first portion within said one of said orthogonally related adjacent ones of said arms, the center conductor of said second portion being electrically connected to said circular member; and a second coaxial line having a third portion extending upward toward the other of said orthogonally related adjacent ones of said arms substantially parallel to said cylinder, and a fourth portion coupled to and extending at substantially right angles to said third portion within said other of said orthogonally related adjacent ones of said arms, the center conductor of said fourth portion being electrically connected to said circular member.
Claim 10
Dependent Claim
102 words
An antenna according to claim 8, further including at least a first member disposed one quarter wavelength at the operating frequency of said discone antenna below said turnstile antenna electrically connecting said cylinder and the outer conductor of said first portion, and a second member disposed one quarter wavelength at the operating frequency of said discone antenna below said turnstile antenna electrically connecting said cylinder and the outer conductor of said third portion, said first and second members providing at least a part of a one quarter wavelength choke for energy on said cylinder at the operating frequency of said discone antenna.
Claim 11
Dependent Claim
81 words
An antenna according to claim 1, wherein said first energy coupling means includes a first coaxial line extending within and through one of said orthogonally related adjacent ones of said arms, the center conductor of said first coaxial line being electrically connected to said circular member, and a second coaxial line extending within and through the other of said orthogonally related adjacent ones of said arms, the center conductor of said second coaxial line being electrically connected to said circular member.
References Cited (Backward Citations)
US3579244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |