US5170176A
Expired / Lapsed
US
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Quadrifilar helix antenna
Assignee: KDDI Corp
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Filing: 1991-02-25
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Granted: 1992-12-08
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Expires: 2011-02-25
Abstract
Abstract A quadrifilar helix antenna according to the present invention incorporates four helix conductors wound around an axis in the same winding direction. Each of the helix conductors has a linear conductor which is parallel to its axis at either end or both ends of the helix conductor. The present antenna reduces the effect of multipath fading due to sea-surface reflection in mobile satellite communications.
Inventors
- 👤 Masayuki Yasunaga
- 👤 Takayasu Shiokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:29
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
232 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four feed lines extending from said feed circuit so that said feed lines are perpendicular to one another and are parallel to an xy plane; four linear conductors each having a top and a bottom end, a top end of each said four linear conductors being connected to a corresponding feed line and positioned such that said linear conductors are parallel to the z-axis, said linear conductors all having the same length; and four helix conductors each having a first end and a second end so that the first end of each of said four helix conductors is attached to a bottom end of a corresponding linear conductor among said four linear conductors, said four helix conductors being positioned such that center axes of said four helix conductors are defined along the z-axis, said four helix conductors all having the same winding direction, wherein a length of each of said linear conductors is 0.02-0.06 λ, a pitch length of each of said helix conductors is 0.9-1.1 λ, a number of turns of a helix of each of said helix conductors is 0.4-0.6 and the radius of the helix is 0.02-0.06 λ, where λ is a wavelength, and a corresponding feed line, linear conductor and helix conductor are integral and made from a single wire.
Claim 2
Dependent Claim
232 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four feed lines extending from said feed circuit so that said feed lines are perpendicular to one another and are parallel to an xy plane; four linear conductors each having a top and a bottom end, a top end of each said four linear conductors being connected to a corresponding feed line and positioned such that said linear conductors are parallel to the z-axis, said linear conductors all having the same length; and four helix conductors each having a first end and a second end so that the first end of each of said four helix conductors is attached to a bottom end of a corresponding linear conductor among said four linear conductors, said four helix conductors being positioned such that center axes of said four helix conductors are defined along the z-axis, said four helix conductors all having the same winding direction, wherein a length of each of said linear conductors is 0.02-0.06 λ, a pitch length of each of said helix conductors is 0.9-1.1 λ, a number of turns of a helix of each of said helix conductors is 0.4-0.6 and the radius of the helix is 0.02-0.06 λ, where λ is a wavelength, and a corresponding feed line, linear conductor and helix conductor are integral and made from a single wire.
Claim 3
Dependent Claim
19 words
A quadrifilar helix antenna according to claim 1, wherein an each second end of said helix conductors is open.
Claim 4
Dependent Claim
24 words
A quadrifilar helix antenna according to claim 1, wherein the second ends of said helix conductors are short-circuited to one another by linear conductors.
Claim 5
Dependent Claim
145 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four conductive feed lines extending from said feed circuit so that said feed lines are perpendicular to one another and are parallel to an xy plane; four helix conductors having a first end and a second end so that the first end of each of said four helix conductors is attached to one of a corresponding feed line, said four helix conductors being positioned such that center axes of said four helix conductors are all defined along the z-axis, said four helix conductors all having the same winding direction; and four linear conductors each attached to the second end of a corresponding helix conductor among said four helix conductors so that said linear conductors are parallel to the z-axis, said linear conductors all having the same length.
Claim 6
Dependent Claim
145 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four conductive feed lines extending from said feed circuit so that said feed lines are perpendicular to one another and are parallel to an xy plane; four helix conductors having a first end and a second end so that the first end of each of said four helix conductors is attached to one of a corresponding feed line, said four helix conductors being positioned such that center axes of said four helix conductors are all defined along the z-axis, said four helix conductors all having the same winding direction; and four linear conductors each attached to the second end of a corresponding helix conductor among said four helix conductors so that said linear conductors are parallel to the z-axis, said linear conductors all having the same length.
Claim 7
Dependent Claim
61 words
A quadrifilar helix antenna according to claim 4, wherein a length of each of said linear conductors is 0.02-0.06 λ, a pitch length of each of said helix conductors is 0.9-1.1 λ, a number of turns of a helix of each of said helix conductor is 0.4-0.6, and the radius of the helix is 0.02-0.06 λ, where λ is a wavelength.
Claim 8
Dependent Claim
18 words
A quadrifilar helix antenna according to claim 4, wherein the bottom ends of said linear conductors are open.
Claim 9
Dependent Claim
24 words
A quadrifilar helix antenna according to claim 4, wherein the bottom ends of said linear conductors are short-circuited to one another by linear conductors.
Claim 10
Dependent Claim
200 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four feed lines extending from said feed circuit so that those feed lines are perpendicular to one another and are parallel to xy plane; four first linear conductors each having a top and a bottom end, a top end of each said four linear conductors being connected to a corresponding feed line and positioned such that said linear conductors are parallel to the z-axis, said linear conductors all having the same length; four helix conductors each having a first end and a second end so that center axes of each helix conductor among said four helix conductors are defined along the z-axis, the bottom end of each of said first linear conductors being connected to the first end of a corresponding helix conductor among the said four helix conductors, said helix conductors all having the same winding direction; and four second linear conductors, each attached to the second end of a corresponding helix conductor among said four helix conductors and positioned so that said second linear conductors are parallel to the z-axis said four second linear conductors all having the same length.
Claim 11
Dependent Claim
200 words
A quadrifilar helix antenna comprising: a feed circuit located on a z-axis of an xyz rectangular coordinates system; four feed lines extending from said feed circuit so that those feed lines are perpendicular to one another and are parallel to xy plane; four first linear conductors each having a top and a bottom end, a top end of each said four linear conductors being connected to a corresponding feed line and positioned such that said linear conductors are parallel to the z-axis, said linear conductors all having the same length; four helix conductors each having a first end and a second end so that center axes of each helix conductor among said four helix conductors are defined along the z-axis, the bottom end of each of said first linear conductors being connected to the first end of a corresponding helix conductor among the said four helix conductors, said helix conductors all having the same winding direction; and four second linear conductors, each attached to the second end of a corresponding helix conductor among said four helix conductors and positioned so that said second linear conductors are parallel to the z-axis said four second linear conductors all having the same length.
Claim 12
Dependent Claim
75 words
A quadrifilar helix antenna according to claim 8, wherein a length of each of said first linear conductors is 0.02-0.06 λ, a length of each of said second linear conductors is 0.02-0.06 λ, a pitch length of each of said helix conductors is 0.9-1.1 λ, a number of turns of a helix of each of said helix conductor is 0.4-0.6, and the radius of the helix is 0.02-0.06 80 , where λ is a wavelength.
Claim 13
Dependent Claim
19 words
A quadrifilar helix antenna according to claim 8, wherein the bottom ends of said second linear conductors are open.
Claim 14
Dependent Claim
25 words
A quadrifilar helix antenna according to claim 8, wherein the bottom ends of said second linear conductors are short-circuited to one another by linear conductors.
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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |