US4282528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural antennas having a sleeve dipole
Assignee: Communications Patents Ltd
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Filing: 1979-05-03
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Granted: 1981-08-04
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Expires: 1999-05-03
Abstract
Abstract An antenna arrangement comprising a first antenna mounted on an elongate support, and a feeder cable incorporating screened and screening conductors extending longitudinally of the support from the first antenna. The screened conductor is connected to a detector of signals in a first frequency band received by the first antenna, and the screening conductor forms a second antenna connected to a detector of signals in at least one further frequency band. The first antenna may be in the form of a sleeve dipole. The support may be in the form of a tube of non-conducting material in which the first antenna is located towards one end, the feeder cable extending through the tube from the first antenna to the end of the tube remote from the first antenna.
Inventors
- 👤 John F. Aspinwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:44
CPC Classifications
H; H01; H01Q; H01Q5/00; H01Q5/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
A dual frequency band antenna arrangement with a single lead cable comprising in combination, a first antenna consisting of a vertically disposed sleeve dipole antenna having an electrical length related to the wavelength of a first higher frequency band mounted on an elongate support, a mounting assembly for said support, and a feeder cable incorporating screened and screening conductors and consisting of said single lead cable extending longitudinally of the support from the first antenna to the mounting assembly and having a vertically disposed dimension providing an aperiodic whip antenna for a second lower frequency band, the screened conductor being connected within said mounting assembly to means for processing signals in said first higher frequency band received by the first antenna, the screening conductor forming a second antenna connected to the means processing signals in the first band within said mounting assembly by filter means grounding that conductor only for the frequency band of the first band and further connected within said mounting means to means for processing signals in at least said second lower frequency band received by the screening conductor as an ungrounded vertically disposed antenna member for the lower frequency band.
Claim 2
Dependent Claim
194 words
A dual frequency band antenna arrangement with a single lead cable comprising in combination, a first antenna consisting of a vertically disposed sleeve dipole antenna having an electrical length related to the wavelength of a first higher frequency band mounted on an elongate support, a mounting assembly for said support, and a feeder cable incorporating screened and screening conductors and consisting of said single lead cable extending longitudinally of the support from the first antenna to the mounting assembly and having a vertically disposed dimension providing an aperiodic whip antenna for a second lower frequency band, the screened conductor being connected within said mounting assembly to means for processing signals in said first higher frequency band received by the first antenna, the screening conductor forming a second antenna connected to the means processing signals in the first band within said mounting assembly by filter means grounding that conductor only for the frequency band of the first band and further connected within said mounting means to means for processing signals in at least said second lower frequency band received by the screening conductor as an ungrounded vertically disposed antenna member for the lower frequency band.
Claim 3
Dependent Claim
15 words
An antenna arrangement according to claim 1, wherein the first antenna comprises a sleeve dipole.
Claim 4
Dependent Claim
49 words
An antenna arrangement according to claim 1, wherein the support comprises a tube of non-conducting material in which the first antenna is located towards one end thereof, the feeder cable extending through the tube from the first antenna to the end of the tube remote from the first antenna.
Claim 5
Dependent Claim
47 words
An antenna arrangement according to claim 1, wherein the screening conductor is connected to a source of fixed potential by a circuit presenting a low impedance to signals in said first frequency band and a high impedance to signals in said at least one further frequency band.
Claim 6
Dependent Claim
15 words
An antenna arrangement according to claim 4, wherein said circuit comprises a series resonant circuit.
Claim 7
Dependent Claim
28 words
An antenna arrangement according to claim 1, wherein the screened and screening conductors are connected to respective band pass filter circuits to process respectively the two frequency bands.
Claim 8
Dependent Claim
24 words
An antenna arrangement according to claim 6, wherein the outputs of the filter circuits are connected via preamplification circuits to a common signal path.
Claim 9
Dependent Claim
18 words
An antenna arrangement according to claim 7, wherein the pre-amplification circuits are powered via the common signal path.
Claim 10
Dependent Claim
31 words
An antenna arrangement according to claim 7, wherein the common signal path is connected to receivers in respect of each said frequency band by a splitter circuit located adjacent the receivers.
References Cited (Backward Citations)
GB445968A
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GB453484A
Cited
GB462571A
Cited
GB644521A
Cited
FR1184610A
Cited
US2954556A
Cited
DE1466279A1
Cited
US3879735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |