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Patent US3662389A successfully refreshed from Google Patents.
US3662389A
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Determination of far field antenna patterns using fresnel probe measurements
Assignee: International Business Machines Corp
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Filing: 1970-04-24
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Granted: 1972-05-09
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Expires: 1990-04-24
Abstract
Abstract Apparatus and method for the design and measurement of microwave antenna wave patterns. The far-field radiation pattern of a space fed aperture antenna is determined as a function of the measured radiation characteristics at the antenna focus and the design or measured illumination characteristics of the feed radiator of the antenna.
Inventors
- 👤 Robert T Coffin
- 👤 Raymond W Grundmeyer
- 👤 William H Hefner
- 👤 Ferd H Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:39
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
159 words
Apparatus for determining the far-field radiation pattern of a space fed aperture antenna comprising: a source of wave energy; focusing means for producing a desired phase variation across an electromagnetic wave front so that the wave energy is collimated to a point; first receiving means positioned at said collimated point for detecting said wave energy and providing a first output signal, said focusing means fully includes positioning means for moving said first receiving means in a plurality of coordinate directions; signal transducer means for converting said first signal output into a processable signal data stream; storage means for maintaining a weighting function data output representing the relationship between the amplitude and phase properties of said first receiving means and an alternate receiving means; convolution processing means for performing a convolution on the outputs received from said store means and said transducer means and producing an output signal representative of the farfield radiation pattern of said space fed aperture antenna.
Claim 2
Dependent Claim
159 words
Apparatus for determining the far-field radiation pattern of a space fed aperture antenna comprising: a source of wave energy; focusing means for producing a desired phase variation across an electromagnetic wave front so that the wave energy is collimated to a point; first receiving means positioned at said collimated point for detecting said wave energy and providing a first output signal, said focusing means fully includes positioning means for moving said first receiving means in a plurality of coordinate directions; signal transducer means for converting said first signal output into a processable signal data stream; storage means for maintaining a weighting function data output representing the relationship between the amplitude and phase properties of said first receiving means and an alternate receiving means; convolution processing means for performing a convolution on the outputs received from said store means and said transducer means and producing an output signal representative of the farfield radiation pattern of said space fed aperture antenna.
Claim 3
Dependent Claim
107 words
The process for determining the far-field radiation pattern of a space fed aperture antenna comprising the steps of: generating wave energy; focusing said energy so as to produce a desired phase variation across an electromagnetic wave front so that the wave energy may be collimated to a point; detecting said wave energy at said collimated point and generating a first output signal representative of said detected wave energy; generating a weighting function signal dependent on the amplitude and phase properties of a probe detector receiving said weighting function and said first output signal and performing a convolution process to determine the far-field radiation pattern of said antenna.
Claim 4
Dependent Claim
107 words
The process for determining the far-field radiation pattern of a space fed aperture antenna comprising the steps of: generating wave energy; focusing said energy so as to produce a desired phase variation across an electromagnetic wave front so that the wave energy may be collimated to a point; detecting said wave energy at said collimated point and generating a first output signal representative of said detected wave energy; generating a weighting function signal dependent on the amplitude and phase properties of a probe detector receiving said weighting function and said first output signal and performing a convolution process to determine the far-field radiation pattern of said antenna.
References Cited (Backward Citations)
US3166748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |