US3761846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance-matching resistor
Assignee: Iwatsu Electric Co Ltd
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Filing: 1971-05-03
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Granted: 1973-09-25
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Expires: 1991-05-03
Abstract
Abstract An impedance-matching resistor connected between two transmission paths of different characteristic impedances Zo and (Zo + Rg) by the use of a series-impedance Rg, in which the impedance-matching resistor is formed into a transmission line, such as a coaxial line or a strip line, and a characteristic impedance Zch of the transmission line is varied so as to meet with a condition (Zo + x/L .Rg) at a medium point spaced by a distance x from the input of one of said two transmission paths, the above mentioned one of the two transmission paths having the characteristic impedance Zo.
Inventors
- 👤 K Tsuboi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:24
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H01P5/022; H01P5/028; H01P5/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
An impedance matching resistor comprising a transmission line of predetermined length L, having an axial portion comprising one end having a characteristic impedance Zo and another axial portion integral with the first-mentioned portion comprising the opposite end and having a characteristic impedance (Zo+Rg) to jointly define a relationship, (Zo+xRg/L) defining a characteristic impedance at a point x along a length L of said length of transmission line.
Claim 2
Dependent Claim
67 words
An impedance matching resistor comprising a transmission line of predetermined length L, having an axial portion comprising one end having a characteristic impedance Zo and another axial portion integral with the first-mentioned portion comprising the opposite end and having a characteristic impedance (Zo+Rg) to jointly define a relationship, (Zo+xRg/L) defining a characteristic impedance at a point x along a length L of said length of transmission line.
Claim 3
Dependent Claim
88 words
An impedance matching resistor comprising a first conductor of predetermined length comprising a material having a constant resistance per unit length and a second conductor, said conductors having a configuration wherein the ratio of the transverse dimensions of said conductors at any point along the length thereof defines an exponential function, thereby jointly defining a transmission line having a linear characteristic series impedance variation linear in both directions along the length thereof, and each of said conductors having means for connecting alternatively thereto a bi-directional input and output.
Claim 4
Dependent Claim
88 words
An impedance matching resistor comprising a first conductor of predetermined length comprising a material having a constant resistance per unit length and a second conductor, said conductors having a configuration wherein the ratio of the transverse dimensions of said conductors at any point along the length thereof defines an exponential function, thereby jointly defining a transmission line having a linear characteristic series impedance variation linear in both directions along the length thereof, and each of said conductors having means for connecting alternatively thereto a bi-directional input and output.
Claim 5
Dependent Claim
66 words
An impedance matching resisitor according to claim 11, wherein said conductors are disposed coaxially, said first conductor comprises a center coaxial conductor having a uniform width, insulation disposed between the two conductors for insulating said first conductor from said second conductor, said second conductor having a configuration whereby the ratio of its transverse dimension and the transverse dimension of said first conductor define an exponential function.
Claim 6
Dependent Claim
45 words
An impedance matching resistor according to claim 2, wherein said second conductor has a uniform width and wherein said first conductor has a configuration whereby the ratio of the transverse dimension second conductor and the transverse dimension of said first conductor define an exponential function.
Claim 7
Dependent Claim
22 words
An impedance matching resistor according to claim 2, wherein said first conductor and said second conductor define a strip line transmission line.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |