US4110685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Standing wave ratio measurement instrument
Assignee: Individual
•
Filing: 1976-11-01
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Granted: 1978-08-29
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Expires: 1996-11-01
Abstract
Abstract The output voltages produced by two directional couplers are applied to analog circuitry for generating a voltage that is directly proportional to return loss. An analog meter scale is calibrated to indicate return loss in decibel units and/or voltage standing wave ratio (VSWR) directly.
Inventors
- 👤 Virgil G. Leenerts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:37
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/04; G01R27/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission line; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of return loss to the user.
Claim 2
Dependent Claim
129 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission line; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of return loss to the user.
Claim 3
Dependent Claim
41 words
In a radio frequency power transmission system as in claim 1, the combination further comprising buffer amplifier means connected between the directional coupler means and the logarithmic amplifier means for providing a low impedance source for driving the logarithmic amplifier means.
Claim 4
Dependent Claim
25 words
In a radio frequency power transmission system as in claim 2 wherein the analog display means includes a display amplifier for amplifying the third voltage.
Claim 5
Dependent Claim
132 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission lines; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of voltage standing wave ratio (VSWR) to the user.
Claim 6
Dependent Claim
132 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission lines; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of voltage standing wave ratio (VSWR) to the user.
Claim 7
Dependent Claim
132 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission line; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of load match efficiency in percent to the user.
Claim 8
Dependent Claim
132 words
In a radio frequency power transmission system in which radio frequency power is transferred from a source to a load via a transmission line, the combination comprising: directional coupler means connected along the transmission line for producing a first voltage indicative of the forward power conveyed by the transmission line and for producing a second voltage indicative of the reflected power conveyed by the transmission line; logarithmic amplifier means for receiving the first and second voltages and for producing a third voltage that is proportional to the difference between the logarithm of the first voltage and the logarithm of the second voltage; and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of load match efficiency in percent to the user.
Claim 9
Dependent Claim
110 words
An analog instrument for measuring the quality of the match between a transmitter and a load coupled thereto by a transmission line, the instrument comprising: logarithmic amplifier means for receiving a first voltage E f indicative of the forward power conveyed by the transmission line, for receiving a second voltage E r indicative of the reflected power conveyed by the transmission line, and for producing a third voltage that is proportional to the logarithm of (E f /E r ); and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of voltage standing wave ratio (VSWR) to the user.
Claim 10
Dependent Claim
110 words
An analog instrument for measuring the quality of the match between a transmitter and a load coupled thereto by a transmission line, the instrument comprising: logarithmic amplifier means for receiving a first voltage E f indicative of the forward power conveyed by the transmission line, for receiving a second voltage E r indicative of the reflected power conveyed by the transmission line, and for producing a third voltage that is proportional to the logarithm of (E f /E r ); and analog display means connected to the logarithmic amplifier means for receiving the third voltage and for providing a visual indication of voltage standing wave ratio (VSWR) to the user.
Claim 11
Dependent Claim
20 words
An analog instrument as in claim 6 wherein the analog display means also provides a visual indication of return loss.
Claim 12
Dependent Claim
23 words
An analog instrument as in claim 6 wherein the analog display means also provides a visual indication of load match efficiency in percent.
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) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |