Patent US3800218A successfully refreshed from Google Patents.
US3800218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
R. f. impedance bridge for measuring reflection coefficient
Assignee: Jerrold Electronics Corp
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Filing: 1973-02-07
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Granted: 1974-03-26
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Expires: 1993-02-07
Abstract
Abstract A bridge for measuring the reflection coefficient of a twoterminal load, in which the insertion loss between an input port and an output port is proportional to the reflection coefficient of the load connected to a third port, and the constant of proportionality is substantially independent of frequency; includes a balun, a first two-terminal network connected in one arm of the bridge, a second two-terminal network connected in the opposite arm of the bridge, and a resistance equal to the reference resistance in the arm opposite the port to which the load is connected. The impedance of the second network is the inverse, relative to the reference resistance, of the parallel combination of the first network and the additional impedance to ground caused by the connection of the balun.
Inventors
- 👤 J Shekel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:21
CPC Classifications
G; G01; G01R; G01R17/00; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
201 words
A bridge for measuring the reflection coefficient of a twoterminal load relative to a characteristic impedance Ro, said bridge having a first terminal for connection to said load, a second terminal for connection to a generator, a third terminal for connection to a receiver or a measuring device, a fourth terminal for connection to the respective ground terminals of said load, generator and receiver or measuring device, a fifth terminal, a resistance of value Ro being connected between said second terminal and said fifth terminal, a first two-terminal network being connected between said fifth terminal and said fourth terminal, a second Two-terminal network being connected between said first terminal and said second terminal, a balun having a balanced terminal pair and an unbalanced terminal pair, said balanced terminal pair being connected between said first terminal and said fifth terminal of said bridge, said unbalanced terminal pair being connected between said third terminal and said fourth terminal of said bridge, said second network having an impedance which is substantially equal to the inverse, with respect to Ro, of the parallel combination of said first network and the effective load presented by said balun between said fifth terminal of said bridge and ground.
Claim 2
Dependent Claim
201 words
A bridge for measuring the reflection coefficient of a twoterminal load relative to a characteristic impedance Ro, said bridge having a first terminal for connection to said load, a second terminal for connection to a generator, a third terminal for connection to a receiver or a measuring device, a fourth terminal for connection to the respective ground terminals of said load, generator and receiver or measuring device, a fifth terminal, a resistance of value Ro being connected between said second terminal and said fifth terminal, a first two-terminal network being connected between said fifth terminal and said fourth terminal, a second Two-terminal network being connected between said first terminal and said second terminal, a balun having a balanced terminal pair and an unbalanced terminal pair, said balanced terminal pair being connected between said first terminal and said fifth terminal of said bridge, said unbalanced terminal pair being connected between said third terminal and said fourth terminal of said bridge, said second network having an impedance which is substantially equal to the inverse, with respect to Ro, of the parallel combination of said first network and the effective load presented by said balun between said fifth terminal of said bridge and ground.
Claim 3
Dependent Claim
19 words
The bridge of claim 1, wherein said balun comprises a section of coaxial cable wound on a ferrite core.
Claim 4
Dependent Claim
26 words
The bridge according to claim 1, further comprising an equalizer matched at its input and output to Ro connected between said second terminal and said generator.
Claim 5
Dependent Claim
30 words
The bridge according to claim 3, further comprising a second equalizer matched at its input and output to Ro connected between said third terminal and said receiver or measuring device.
Claim 6
Dependent Claim
29 words
The bridge according to claim 1, further comprising an equalizer matched at its input and output to Ro connected between said third terminal and said receiver or measuring device.
Claim 7
Dependent Claim
26 words
The bridge according to claim 2, further comprising an equalizer matched at its input and output to Ro connected between said second terminal and said generator.
Claim 8
Dependent Claim
30 words
The bridge according to claim 6, further comprising a second equalizer matched at its input and output to Ro connected between said third terminal and said receiver or measuring device.
Claim 9
Dependent Claim
29 words
The bridge according to claim 2, further comprising an equalizer matched at its input and output to Ro connected between said third terminal and said receiver or measuring device.
References Cited (Backward Citations)
US3384887A
Cited
US3479587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |