Patent US3727137A successfully refreshed from Google Patents.
US3727137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna pattern simulator
Assignee: United States Department of the Navy
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Filing: 1971-02-19
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Granted: 1973-04-10
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Expires: 1991-02-19
Abstract
Abstract A simulated antenna polar pattern signal is generated by apparatus including a 6 inch pattern wheel driven by a synchronous motor. The pattern wheel is a dielectric disc with copper plating on predetermined portions of one side of the disc and a stationary metal probe mounted flat against the other side of the disc. Rotation of the disc relative to the probe forms a varying capacitance in a circuit that modulates a carrier signal in accordance with the antenna polar pattern.
Inventors
- 👤 M Barron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:40
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4082
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A signal generator comprising: a cyclical variable resonant frequency tank circuit adapted to receive a constant input carrier frequency signal and providing an amplitude modulated output signal, said tank circuit including an inductor, and variable capacitance means connected in parallel with said inductor, said capacitance means having a dielectric disc with a central axis, an electrical conductor slidably contacting one side and along the radius of said disc, rotatable about said axis relative to said disc, and electrically connected to one terminal of said inductor, and a continuous annular conductor affixed about said axis to the other side of said disc and electrically connected to the other terminal of said inductor, the radial length of said annular conductor preselectively varying with disc rotation; and detector means connected to said tank circuit for receiving said amplitude modulated output signal and detecting the amplitude envelope of said amplitude modulated output signal.
Claim 2
Dependent Claim
149 words
A signal generator comprising: a cyclical variable resonant frequency tank circuit adapted to receive a constant input carrier frequency signal and providing an amplitude modulated output signal, said tank circuit including an inductor, and variable capacitance means connected in parallel with said inductor, said capacitance means having a dielectric disc with a central axis, an electrical conductor slidably contacting one side and along the radius of said disc, rotatable about said axis relative to said disc, and electrically connected to one terminal of said inductor, and a continuous annular conductor affixed about said axis to the other side of said disc and electrically connected to the other terminal of said inductor, the radial length of said annular conductor preselectively varying with disc rotation; and detector means connected to said tank circuit for receiving said amplitude modulated output signal and detecting the amplitude envelope of said amplitude modulated output signal.
Claim 3
Dependent Claim
48 words
A signal generator according to claim 1 wherein said detector means further comprises: a diode connected to receive and rectify the amplitude modulated signal; a resistance-capacitance parallel circuit connected in shunt relationship to said diode; and an output terminal for providing the envelope of the amplitude modulated signal.
Claim 4
Dependent Claim
188 words
An antenna pattern simulator comprising: a synchronous motor; a cyclical variable resonant frequency tank circuit adapted to receive an input carrier frequency and including a variable capacitance disc comprising a circuit board with one side copper plated in a first configuration forming a pattern representative of an antenna field and a second configuration surrounding the center of said circuit board forming a solid circular pattern and touching said first configuration, said variable capacitance disc rotatably connected to said synchronous motor for providing an amplitude modulated output signal having an amplitude envelope varying in amplitude of said pattern representative of the antenna field; detector means connected to said tank circuit for receiving said amplitude modulated signal and detecting said amplitude envelope of said amplitude modulated output signal and having an output means for providing said amplitude modulated output signal; a synchro rotatably connected to said synchronous motor for providing an output signal indicative of the angular displacement of said variable capacitance disc; and visual display means connected to receive the output signal of said synchro for providing a visual indication of the angular displacement of said variable capacitance disc.
Claim 5
Dependent Claim
188 words
An antenna pattern simulator comprising: a synchronous motor; a cyclical variable resonant frequency tank circuit adapted to receive an input carrier frequency and including a variable capacitance disc comprising a circuit board with one side copper plated in a first configuration forming a pattern representative of an antenna field and a second configuration surrounding the center of said circuit board forming a solid circular pattern and touching said first configuration, said variable capacitance disc rotatably connected to said synchronous motor for providing an amplitude modulated output signal having an amplitude envelope varying in amplitude of said pattern representative of the antenna field; detector means connected to said tank circuit for receiving said amplitude modulated signal and detecting said amplitude envelope of said amplitude modulated output signal and having an output means for providing said amplitude modulated output signal; a synchro rotatably connected to said synchronous motor for providing an output signal indicative of the angular displacement of said variable capacitance disc; and visual display means connected to receive the output signal of said synchro for providing a visual indication of the angular displacement of said variable capacitance disc.
Claim 6
Dependent Claim
41 words
An antenna pattern simulator according to claim 3 wherein said tank circuit further comprises: a fixed capacitance serially connected to said variable capacitance disc; and a transformer winding connected in parallel to said serially connected fixed capacitance and variable capacitance disc.
Claim 7
Dependent Claim
50 words
An antenna pattern simulator according to claim 4 wherein said detector means further comprises: a diode connected to receive and rectify the amplitude modulated signal; a resistance-capacitance parallel circuit connected in shunt relationship to said diode; and an output terminal for providing the envelope of the amplitude modulated output signal.
Claim 8
Dependent Claim
19 words
An antenna pattern simulator according to claim 5 wherein said visual display means further comprises a plan position indicator.
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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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |