US4818949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave and millimeter-wave spectrum analyzer
Assignee: National Security Agency
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Filing: 1988-01-06
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Granted: 1989-04-04
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Expires: 2008-01-06
Abstract
Abstract An apparatus is described which performs real time spectrum analysis of large bandwidth radio frequency signals. The apparatus allows the simultaneous monitoring of all frequencies within the band of interest, and operates in the presence of multiple frequencies.
Inventors
- 👤 Jonathan D. Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:23
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16; G01R23/163
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
74 words
Spectrum analysis apparatus, comprising: a radio frequency signal source; means for guiding radio frequency propagation; means for superimposing two replicas of the signal from said signal source in said guiding means such that the replicas propagate in different directions; means for simultaneously measuring the radio frequency power in said guiding means at multiple spatial locations; means for temporally integrating said power measurements; and means for effecting a Fourier transform of said integrated power measurements.
Claim 2
Dependent Claim
74 words
Spectrum analysis apparatus, comprising: a radio frequency signal source; means for guiding radio frequency propagation; means for superimposing two replicas of the signal from said signal source in said guiding means such that the replicas propagate in different directions; means for simultaneously measuring the radio frequency power in said guiding means at multiple spatial locations; means for temporally integrating said power measurements; and means for effecting a Fourier transform of said integrated power measurements.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1, wherein said guiding means is a waveguide.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 or 2, wherein said superposition means further comprises termination by a shorting device.
Claim 5
Dependent Claim
25 words
The apparatus of claim 1 or 2, wherein said superposition means further comprises means for introducing said signal into opposite ends of said guiding means.
Claim 6
Dependent Claim
18 words
The apparatus of claim 1 or 2 wherein said Fourier transform means further comprises means for input weighting.
Claim 7
Dependent Claim
86 words
A spectrum analysis system, comprising: a radio frequency signal source; means for guiding radio frequency propagation; means for translating said radio frequency signal in frequency; means for superimposing two replicas of the translated signal from said frequency translating means in said guiding means such that the replicas propagate in different directions; means for simultaneously measuring the radio frequency power in said guiding means at multiple spatial locations; means for temporally integrating said power measurements; and means for effecting a Fourier transform of said integrated power measurements.
Claim 8
Dependent Claim
86 words
A spectrum analysis system, comprising: a radio frequency signal source; means for guiding radio frequency propagation; means for translating said radio frequency signal in frequency; means for superimposing two replicas of the translated signal from said frequency translating means in said guiding means such that the replicas propagate in different directions; means for simultaneously measuring the radio frequency power in said guiding means at multiple spatial locations; means for temporally integrating said power measurements; and means for effecting a Fourier transform of said integrated power measurements.
Claim 9
Dependent Claim
12 words
The apparatus of claim 6, wherein said guiding means is a waveguide.
Claim 10
Dependent Claim
18 words
The apparatus of claim 6 or 7, wherein said superposition means further comprises termination by a shorting device.
Claim 11
Dependent Claim
25 words
The apparatus of claim 6 or 7, wherein said superposition means further comprises means for introducing said signal into opposite ends of said guiding means.
Claim 12
Dependent Claim
18 words
The apparatus of claim 6 or 7 wherein said Fourier transform means further comprises means for input weighting.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |