Patent US3757222A successfully refreshed from Google Patents.
US3757222A
Expired / Lapsed
US
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D shorting diodes controlling a transmission line electrical length single sideband generator employing a plurality of cyclically switche
Assignee: International Standard Electric Corp
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Filing: 1971-01-11
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Granted: 1973-09-04
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Expires: 1991-01-11
Abstract
Abstract A digital single sideband generator in which the carrier frequency is fed via a circulator to a (microstrip) transmission line which has a series of switchable short circuits (RF grounded diodes) along a length of the line equal to half the carrier wavelength. Successive cyclic switching of the diodes simulates a moving RF energy reflector advancing or retarding the phase of the reflected energy according to direction of switching and resulting in a frequency offset at the circulator output determined by the cyclic rate.
Inventors
- 👤 F Oberbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:09
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; H03C7/025; H03C7/027; H03B; H03B21/00; H03C1/00; H03C1/52; H03C1/60; H03D; H03D9/00; H03D9/06; H03D9/0608
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A single sideband generating device for a radio frequency system, comprising: a radio frequency transmission line having an electrical length at least equal to one half wavelength at the carrier frequency; a radio frequency circulator having input, output and intermediate ports, said intermediate port being connected to a first end of said transmission line and said input and output ports providing carrier input and output, respectively; a plurality of electrically controllable shorting devices spaced along a half carrier wavelength of said transmission line; and means for cyclically controlling said shorting devices to produce short circuits to ground at corresponding locations progressively along the length of said transmission line, thereby to provide a variable radio frequency reflection point for energy entering said line from said intermediate circulator port, said cyclical control being at a rate and in a sense corresponding to the desired magnitude of sideband frequency offset from said carrier and the sense of said sideband frequency offset, respectively.
Claim 2
Dependent Claim
159 words
A single sideband generating device for a radio frequency system, comprising: a radio frequency transmission line having an electrical length at least equal to one half wavelength at the carrier frequency; a radio frequency circulator having input, output and intermediate ports, said intermediate port being connected to a first end of said transmission line and said input and output ports providing carrier input and output, respectively; a plurality of electrically controllable shorting devices spaced along a half carrier wavelength of said transmission line; and means for cyclically controlling said shorting devices to produce short circuits to ground at corresponding locations progressively along the length of said transmission line, thereby to provide a variable radio frequency reflection point for energy entering said line from said intermediate circulator port, said cyclical control being at a rate and in a sense corresponding to the desired magnitude of sideband frequency offset from said carrier and the sense of said sideband frequency offset, respectively.
Claim 3
Dependent Claim
77 words
Apparatus according to claim 1 in which said shorting devices comprise a plurality of normally open devices equally spaced along said half wavelength and said means for cyclically controlling comprises means for electrically sequencing said shorting devices to cause them to provide said short circuits to ground, one at a time, said sequencing proceeding in a direction along said line and at a rate corresponding, respectively, to the desired sense and magnitude of said sideband frequency offset.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 2 in which said shorting devices include diodes responsive to said cyclical control, said means for cyclically controlling comprising an electricAl pulse distributor to produce said electrical sequencing.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 1 in which said transmission line is a microstrip transmission line.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 4 including a matched load connected to the second end of said transmission line for terminating said line.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |