US5450093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Center-fed multifilar helix antenna
Assignee: United States Department of the Navy
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Filing: 1994-04-20
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Granted: 1995-09-12
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Expires: 2014-04-20
Abstract
Abstract An antenna system including a phasing circuit for producing balanced, phaseisplaced, signals for connection to an antenna. The antenna comprises, for each set of balanced phase signals, a pair of antenna elements disposed serially along a helical path. A transmission line, connected to each of the phasing circuit terminals, drives each antenna element pair at a center location by being connected to the proximate ends of each pair. The antenna has a omnidirectional radiation pattern, a wide band width, a good front-to-back ratio and can be constructed in a compact form.
Inventors
- 👤 Chang S. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:20
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
144 words
An antenna extending along an axis for operating with respect to a ground plane and for connection to a signal processor operating at a characteristic center frequency with a plurality of phased signals, said antenna comprising: a plurality of sets of axially coextensive elongated conductive antenna elements, each said antenna element in a set lying along one of a plurality of substantially equally spaced right helical paths about a helix axis and being proximate at a center point along the helical path, said antenna having a length along the helix axis of between about 1/2 wavelength and one wavelength at the characteristic center frequency, and balanced feed transmission means of connected to each said set of conductive antenna elements at the center point for transferring individual phased signals between the signal processor and each said set of antenna elements at each said center point.
Claim 2
Dependent Claim
144 words
An antenna extending along an axis for operating with respect to a ground plane and for connection to a signal processor operating at a characteristic center frequency with a plurality of phased signals, said antenna comprising: a plurality of sets of axially coextensive elongated conductive antenna elements, each said antenna element in a set lying along one of a plurality of substantially equally spaced right helical paths about a helix axis and being proximate at a center point along the helical path, said antenna having a length along the helix axis of between about 1/2 wavelength and one wavelength at the characteristic center frequency, and balanced feed transmission means of connected to each said set of conductive antenna elements at the center point for transferring individual phased signals between the signal processor and each said set of antenna elements at each said center point.
Claim 3
Dependent Claim
21 words
An antenna as recited in claim 1 wherein the plurality of antenna element sets and plurality of phase signals are equal.
Claim 4
Dependent Claim
25 words
An antenna as recited in claim 2 wherein said plurality of antenna element sets and phase signals are in the range of 2 through 16.
Claim 5
Dependent Claim
28 words
An antenna as recited in claim 2 wherein each said antenna element has a free end that is remote from the said center point and is open circuited.
Claim 6
Dependent Claim
26 words
An antenna as recited in claim 2 wherein each of said antenna elements has a left-handed rotation whereby said antenna operates with a right-handed circular polarization.
Claim 7
Dependent Claim
131 words
An antenna system for radiating a signal from and receiving signals for signal processing means operating at a characteristic center frequency, said antenna system comprising: an antenna including a right cylindrical support and a plurality of axially coextensive elongated conductive antenna elements, each said antenna element being attached to said cylindrical support along one of a plurality of substantially equally spaced helical paths about a helix axis and having an element center point, said antenna having a length along the helix axis of between about 1/2 wavelength and one wavelength at the characteristic center frequency, and phase conversion means intermediate the signal processing means and said antenna elements and having one connection with the signal processing means and a plurality of balanced feed transmission connections to individual antenna element center points.
Claim 8
Dependent Claim
131 words
An antenna system for radiating a signal from and receiving signals for signal processing means operating at a characteristic center frequency, said antenna system comprising: an antenna including a right cylindrical support and a plurality of axially coextensive elongated conductive antenna elements, each said antenna element being attached to said cylindrical support along one of a plurality of substantially equally spaced helical paths about a helix axis and having an element center point, said antenna having a length along the helix axis of between about 1/2 wavelength and one wavelength at the characteristic center frequency, and phase conversion means intermediate the signal processing means and said antenna elements and having one connection with the signal processing means and a plurality of balanced feed transmission connections to individual antenna element center points.
Claim 9
Dependent Claim
25 words
An antenna system as recited in claim 6 wherein said plurality of elements and said plurality of phase conversion connections to said antenna are equal.
Claim 10
Dependent Claim
44 words
An antenna system as recited in claim 7 wherein the signal processing means includes means for transmitting a signal to said antenna system, said phase conversion means splitting the signal into the plurality of equally spaced phase signals for transfer to said antenna elements.
Claim 11
Dependent Claim
44 words
An antenna system as recited in claim 7 wherein the signal processing means includes means for receiving a signal from said antenna system, said phase conversion means combining the phase signals from said antenna elements into a signal for transfer to the receiving means.
Claim 12
Dependent Claim
25 words
An antenna system as recited in claim 7 wherein said plurality of antenna elements and phase signals are in the range of 2 through 16.
Claim 13
Dependent Claim
29 words
An antenna system as recited in claim 7 wherein each said antenna element has a free end that is remote from the said center point and is open circuited.
Claim 14
Dependent Claim
27 words
An antenna system as recited in claim 7 wherein each of said antenna elements has a left-handed rotation whereby said antenna operates with a right-handed circular polarization.
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) | 1998-09-11 | 1999-03-13 | 1999-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-11 | 2003-03-13 | 2003-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-11 | 2007-03-13 | 2007-09-12 | $7700.00 | Window Closed / Lapsed |