US3786355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency resistance discriminator having dead zone output characteristic
Assignee: Cincinnati Electronics Corp
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Filing: 1971-12-28
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Granted: 1974-01-15
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Expires: 1991-12-28
Abstract
Abstract Herein disclosed is an improved loading discriminator for sensing the resistive component of impedance at the input of an antenna coupler. This discriminator provides a first error signal derived through conventional current and voltage sampling techniques. It also provides a second error signal. These error signals are applied to differential amplifier stages in such a way that the resultant control signal has a negative portion derived from the second error signal and a positive portion derived from the first error signal, said portions being separated by a dead zone.
Inventors
- 👤 J Midkiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:39
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
353 words
A loading discriminator of the type adapted to be coupled between a source of radio frequency power and a load, in order to detect resistive deviations from a desired condition of match, said loading discriminator comprising: a resistive voltage divider having an intermediate terminal and first and Second input terminals, means coupled to the source of radio frequency power for providing a current sample across said voltage divider, a common terminal, first, second and third rectifying networks individually connected between said common terminal and the three terminals of said voltage divider, the three rectifier networks comprising, respectively, a first rectifier and a first resistor in series, a second rectifier and a second resistor in series, and a third rectifier and a third resistor in series, said rectifiers being poled alike and having individual output terminals, first, second and third capacitors individually connected between a point of reference potential and said rectifier output terminals, each capacitor constituting, together with its associated resistor and rectifier, a peak detector network, means coupled to said source for applying an a.c. voltage sample to the rectifier networks so that the third rectifier network rectifies that voltage sample as a reference and further so that the first rectifier network rectifies the sum of that sample and the entire current sample and the second rectifier network rectifies the sum of said voltage sample and a portion of said current sample, whereby a first error signal appears between the outputs of the first and third detector networks and a second error signal appears between the outputs of the second and third detector networks, a high impedance for alternating currents coupled between said common terminal and said resistive voltage divider, and differential amplifier means having inputs coupled to the outputs of said detector network and having outputs coupled to said load, said amplifier means being responsive to that portion of one of said error signals which is of positive polarity and to that portion of the other error signal which is of negative polarity so as to produce a resultant output having a dead zone relatively independent of radio frequency power levels.
Claim 2
Dependent Claim
353 words
A loading discriminator of the type adapted to be coupled between a source of radio frequency power and a load, in order to detect resistive deviations from a desired condition of match, said loading discriminator comprising: a resistive voltage divider having an intermediate terminal and first and Second input terminals, means coupled to the source of radio frequency power for providing a current sample across said voltage divider, a common terminal, first, second and third rectifying networks individually connected between said common terminal and the three terminals of said voltage divider, the three rectifier networks comprising, respectively, a first rectifier and a first resistor in series, a second rectifier and a second resistor in series, and a third rectifier and a third resistor in series, said rectifiers being poled alike and having individual output terminals, first, second and third capacitors individually connected between a point of reference potential and said rectifier output terminals, each capacitor constituting, together with its associated resistor and rectifier, a peak detector network, means coupled to said source for applying an a.c. voltage sample to the rectifier networks so that the third rectifier network rectifies that voltage sample as a reference and further so that the first rectifier network rectifies the sum of that sample and the entire current sample and the second rectifier network rectifies the sum of said voltage sample and a portion of said current sample, whereby a first error signal appears between the outputs of the first and third detector networks and a second error signal appears between the outputs of the second and third detector networks, a high impedance for alternating currents coupled between said common terminal and said resistive voltage divider, and differential amplifier means having inputs coupled to the outputs of said detector network and having outputs coupled to said load, said amplifier means being responsive to that portion of one of said error signals which is of positive polarity and to that portion of the other error signal which is of negative polarity so as to produce a resultant output having a dead zone relatively independent of radio frequency power levels.
Claim 3
Dependent Claim
58 words
A loading discriminator in accordance with claim 1 in which the means for providing a current sample comprises a magnetic core coupled to the source and a coil wound on said core and connected to said resistive voltage divider, and further in which the means for applying a voltage sample to the rectifier networks comprises a capacitive divider.
Claim 4
Dependent Claim
256 words
A discriminator for detecting resistive variations presented by an r.f. load to a source of r.f. energy connected to the load, said variations having a desired condition in a range between first and second resistance values, comprising means responsive to current flowing between the source and load for deriving first and second signals that are replicas of the current, the magnitude of said first signal being a predetermined fraction of the magnitude of the second signal, means responsive to the VSWR between leads connecting the source and load for deriving a third signal that is a replica of the voltage between the leads, first means for comparing the first and third signals for deriving a first error signal having a zero level in response to the first resistance being presented by the load to the source, second means for comparing the second and third signals for deriving a second error voltage having a zero level in response to the second resistance being presented by the load to the source, and means responsive to said error signals for deriving an output signal having three levels, a first of said levels being responsive to both said error signals indicating that the presented resistance is less than both said first and second resistances, a second level being responsive to both said error signals indicating that the presented resistance is between said first and second resistances, a third level being responsive to both said error signals indicating that the presented resistance is greater than both said first and second resistances.
Claim 5
Dependent Claim
256 words
A discriminator for detecting resistive variations presented by an r.f. load to a source of r.f. energy connected to the load, said variations having a desired condition in a range between first and second resistance values, comprising means responsive to current flowing between the source and load for deriving first and second signals that are replicas of the current, the magnitude of said first signal being a predetermined fraction of the magnitude of the second signal, means responsive to the VSWR between leads connecting the source and load for deriving a third signal that is a replica of the voltage between the leads, first means for comparing the first and third signals for deriving a first error signal having a zero level in response to the first resistance being presented by the load to the source, second means for comparing the second and third signals for deriving a second error voltage having a zero level in response to the second resistance being presented by the load to the source, and means responsive to said error signals for deriving an output signal having three levels, a first of said levels being responsive to both said error signals indicating that the presented resistance is less than both said first and second resistances, a second level being responsive to both said error signals indicating that the presented resistance is between said first and second resistances, a third level being responsive to both said error signals indicating that the presented resistance is greater than both said first and second resistances.
Claim 6
Dependent Claim
79 words
The discriminator of claim 3 wherein the means for deriving the first and second signals includes a transformer having a single turn primary comprising a lead connecting the source and load, said transformer having a secondary winding, a voltage divider connected across said secondary winding, said divider having a tap, whereby the first signal is derived between one end terminal of the divider and the tap and the second signal is derived between opposite end terminals of the divider.
Claim 7
Dependent Claim
172 words
The discriminator of claim 4 wherein the means for deriving the third signal includes a capacitive voltage divider connected between the terminals and having a tap connected to said one end terminal so that said capacitive voltage divider tap and said one end terminal are at substantially the same potential, said first and second means for comparing including: first, second and third rectifiers having like electrodes respectively connected to said one end terminal, the tap on the divider connected across the secondary winding and the other end terminal, and low pass filter means connected to the other electrode of each rectifier, said filter means including a separate shunt capacitor connected to the other electrode of each rectifier and inductance means in series circuit between the tap of the capacitive voltage divider and the other electrode of each rectifier, whereby the first error voltage is developed between the other electrodes of the first and second rectifiers and the second error voltage is developed between the other electrodes of the second and third rectifiers.
Claim 8
Dependent Claim
271 words
A discriminator for detecting resistive variations presented by an r.f. load to a source of r.f. energy connected to the load, said variations having a desired condition in a range between first and second resistance values, comprising means responsive to current flowing between the source and load for deriving first and second signals that are replicas of the current, the magnitude of said first signal being a predetermined fraction of the magnitude of the second signal, means responsive to the VSWR between leads connecting the source and load for deriving a third signal that is a replica of the voltage between the leads, first means for comparing the first and third signals for deriving a first error signal having a zero level in response to the first resistance being presented by the load to the source, second means for comparing the second and third signals for deriving a second error voltage having a zero level in response to the second resistance being presented by the load to the source, and means responsive to said error signals for deriving an output signal having two limit values between which an intermediate level is derived, one of said limit values being derived in response to both said error signals indicating that the presented resistance is less than both said first and second resistances, the other limit value being derived in response to both said error signals indicating that the presented resistance is greater than both the first and second resistances, the intermediate value being derived in response to both said error signals indicating that the presented resistance is between the first and second resistances.
Claim 9
Dependent Claim
271 words
A discriminator for detecting resistive variations presented by an r.f. load to a source of r.f. energy connected to the load, said variations having a desired condition in a range between first and second resistance values, comprising means responsive to current flowing between the source and load for deriving first and second signals that are replicas of the current, the magnitude of said first signal being a predetermined fraction of the magnitude of the second signal, means responsive to the VSWR between leads connecting the source and load for deriving a third signal that is a replica of the voltage between the leads, first means for comparing the first and third signals for deriving a first error signal having a zero level in response to the first resistance being presented by the load to the source, second means for comparing the second and third signals for deriving a second error voltage having a zero level in response to the second resistance being presented by the load to the source, and means responsive to said error signals for deriving an output signal having two limit values between which an intermediate level is derived, one of said limit values being derived in response to both said error signals indicating that the presented resistance is less than both said first and second resistances, the other limit value being derived in response to both said error signals indicating that the presented resistance is greater than both the first and second resistances, the intermediate value being derived in response to both said error signals indicating that the presented resistance is between the first and second resistances.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |