US3825931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase front detection system
Assignee: SP-MICROWAVE Inc
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Filing: 1972-08-01
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Granted: 1974-07-23
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Expires: 1992-08-01
Abstract
Abstract The invention is an improved arrangement for the detection of the location of the phase front of a signal emitted by a large aperture antenna by employment of a reflecting test device comprising a cyclically varied impedance.
Inventors
- 👤 R Gonzalez
- 👤 H Strenglein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:56
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/10; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/756
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
203 words
Apparatus for investigation of the phase front of an antenna under test comprising: carrier frequency signal source means connected to said antenna under test for exciting said phase front, cyclically variable reflecting impedance means adapted to be placed at selected locations adjacent said phase front for cyclically modulating and reflecting toward said antenna under test carrier frequency signals, coupler means having first and second ports connected in series relation between and responsive both to said carrier frequency source means and to said antenna under test and having third port means for providing an output, signal detector means responsive to said third port means for displaying the amplitude of said reflected modulated carrier frequency signal, said coupler means being adapted to supply through said third port means to said signal detector means both said carrier frequency signal from said carrier frequency signal source means and said reflected modulated carrier frequency signal, said coupler means being connected in series relation with said antenna under test through adjustable tuner means for adjustably matching said coupler means to said antenna under test, and means for adjusting the effective location of said cyclically variable reflecting impedance means with respect to said phase front for nulling said amplitude display.
Claim 2
Dependent Claim
203 words
Apparatus for investigation of the phase front of an antenna under test comprising: carrier frequency signal source means connected to said antenna under test for exciting said phase front, cyclically variable reflecting impedance means adapted to be placed at selected locations adjacent said phase front for cyclically modulating and reflecting toward said antenna under test carrier frequency signals, coupler means having first and second ports connected in series relation between and responsive both to said carrier frequency source means and to said antenna under test and having third port means for providing an output, signal detector means responsive to said third port means for displaying the amplitude of said reflected modulated carrier frequency signal, said coupler means being adapted to supply through said third port means to said signal detector means both said carrier frequency signal from said carrier frequency signal source means and said reflected modulated carrier frequency signal, said coupler means being connected in series relation with said antenna under test through adjustable tuner means for adjustably matching said coupler means to said antenna under test, and means for adjusting the effective location of said cyclically variable reflecting impedance means with respect to said phase front for nulling said amplitude display.
Claim 3
Dependent Claim
222 words
Apparatus for investigation of the phase front of an antenna under test comprising: carrier frequency signal source means connected to said antenna under test for exciting said phase front, cyclically variable reflecting impedance means adapted to be placed at selected locations adjacent said phase front for cyclically modulating and reflecting toward said antenna under test carrier frequency signals including means for adjusting the effective location of said cyclically variable reflecting impedance means with respect to said phase front for nulling amplitude display means, said cyclically variable reflecting impedance means including: sampling antenna means, transmission line means responsive to said sampling antenna means, reflector means for shorting said transmission line means at an end thereof remote from said sampling antenna means, adjustable impedance diode means coupled to cyclic bias current means for varying the reflectivity of said reflector means, and adjustable phase shifter means disposed in series relation within said transmission line means with said sampling antenna means and said adjustable impedance means, and coupler means having first and second ports connected in series relation between the responsive both to said carrier frequency source means and to said antenna under test, said coupler means having third port means for providing an output, and signal detector means responsive to said third port means for displaying the amplitude of said reflected modulated carrier frequency signal.
Claim 4
Dependent Claim
222 words
Apparatus for investigation of the phase front of an antenna under test comprising: carrier frequency signal source means connected to said antenna under test for exciting said phase front, cyclically variable reflecting impedance means adapted to be placed at selected locations adjacent said phase front for cyclically modulating and reflecting toward said antenna under test carrier frequency signals including means for adjusting the effective location of said cyclically variable reflecting impedance means with respect to said phase front for nulling amplitude display means, said cyclically variable reflecting impedance means including: sampling antenna means, transmission line means responsive to said sampling antenna means, reflector means for shorting said transmission line means at an end thereof remote from said sampling antenna means, adjustable impedance diode means coupled to cyclic bias current means for varying the reflectivity of said reflector means, and adjustable phase shifter means disposed in series relation within said transmission line means with said sampling antenna means and said adjustable impedance means, and coupler means having first and second ports connected in series relation between the responsive both to said carrier frequency source means and to said antenna under test, said coupler means having third port means for providing an output, and signal detector means responsive to said third port means for displaying the amplitude of said reflected modulated carrier frequency signal.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |