US4713668A
Expired / Lapsed
US
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Adaptive antenna
Assignee: Nortel Networks Ltd
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Filing: 1986-09-18
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Granted: 1987-12-15
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Expires: 2006-09-18
Abstract
Abstract A steered adaptive antenna arrangement including an adaptive beamforming network 10 to which the output signals of an array of antenna elements are applied, the network having a feedback wherein the summed output of the network is correlated with each element signal, applied to a limiter and added to the steering component whereby the derived value is used to drive the associated weight coefficient, characterized in that the summed output of the beamformer network 10 is further applied to a desired signal estimator 11 the output of which is subtracted from the summed output to provide the feedback input 12 to be correlated with each element signal.
Inventors
- 👤 Francis G. Overbury
- 👤 Christopher R. Ward
- 👤 Jeffrey G. Searle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:32
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2605; H01Q3/2611; H01Q3/2617
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
A steered adaptive antenna arrangement including an adaptive beamforming network to which the output signals of an array of antenna elements are applied, the network having a feedback wherein the summed output of the network is correlated with each element signal, applied to a limiter and added to a steering component whereby a derived value is used to drive an associated weight coefficient, characterised in that the summed output of the beamformer network is further applied to a desired signal estimator the output of which is subtracted from the summed output to provide the feedback input to be correlated with each element signal.
Claim 2
Dependent Claim
103 words
A steered adaptive antenna arrangement including an adaptive beamforming network to which the output signals of an array of antenna elements are applied, the network having a feedback wherein the summed output of the network is correlated with each element signal, applied to a limiter and added to a steering component whereby a derived value is used to drive an associated weight coefficient, characterised in that the summed output of the beamformer network is further applied to a desired signal estimator the output of which is subtracted from the summed output to provide the feedback input to be correlated with each element signal.
Claim 3
Dependent Claim
82 words
An adaptive antenna arrangement according to claim 1 wherein the desired signal estimator comprises a zero crossing detector to which the summed output of the beamformer network is applied, a bandpass filter to which the zero crossing detector output is applied to extract phase information and a multiplier to which the filter output is applied together with a signal being the mean of the modulus of the summed output, the multiplier output being substracted from the summed output to provide the feedback.
References Cited (Backward Citations)
US3876947A
Cited
US4495502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |