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Patent US3842359A successfully refreshed from Google Patents.
US3842359A
Expired / Lapsed
US
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Balanced parametric amplifier
Assignee: Westinghouse Electric Corp
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Filing: 1973-11-30
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Granted: 1974-10-15
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Expires: 1993-11-30
Abstract
Abstract A balanced parametric amplifier fabricated on a dielectric substrate located in a section of rectangular waveguide including a waveguide to stripline transition and having a pair of Schottky varactor diodes located at the junction of a suspended substrate stripline transmission line forming the signal circuit and a dielectrically loaded balanced parallel strip transmission line forming the pump circuit which also includes the waveguide to stripline transition. Each of the transmission lines is comprised of parallel metal strips of like configuration formed on a common dielectric substrate, one strip on each of the opposing broad surfaces of the substrate, with a Schottky varactor diode mounted on each of the broad surfaces at the junction of the suspended substrate stripline and the parallel strip transmission lines. Inductive posts on either side of the varactor diodes also run through the common dielectric substrate to the conductive strip on each of the opposing broad surfaces to form an idler circuit to restrict the idler circuit current to the vicinity of the varactor diodes.
Inventors
- 👤 L Dickens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
442 words
A parametric amplifier including a signal circuit, a pump circuit, and an idler circuit with varactor diode means located at the junction of the signal circuit and the pump circuit, comprising in combination: a section of microwave waveguide having a cavIty; said pump circuit supplying pump energy from an external source to one end of said section of waveguide and including, dielectrically loaded parallel strip transmission line means terminating at one end in said waveguide cavity, a waveguide to parallel strip transmission line transition coupling the other end of said parallel strip transmission line means to said external pump source, said parallel strip transmission line terminating in said transition, and first inductive reactance means selectively positioned with respect to said varactor diode means in said parallel strip transmission line means for matching said varactor diode means to the pump energy; said signal circuit commonly coupling a signal from an external signal circuit to and from the other end of said section of waveguide and including, suspended substrate stripline transmission line means located in said waveguide cavity for transforming the impedance of the external signal circuit and the varactor diode means to a common point of relatively low impedance and for obtaining a double tuned gain-bandpass characteristic, said suspended substrate stripline transmission line means comprising, a first stripline portion of selected geometry for reducing the magnitude of the external load resistance provided by said external signal circuit to a predetermined magnitude, a second stripline portion of selected geometry adjacent said first stripline portion and acting as a resonant circuit tuned to the frequency of said signal coupled to said signal circuit, a third stripline portion coupled to said first and second stripline portions, being of selected geometry and acting as a relatively low reactance section that parallely resonates with the reactance of the varactor diode means and forming said common point of relatively low impedance thereby, and a fourth stripline portion of selective geometry adjacent said third stripline portion and acting as an impedance inverter of the reactance of the reactor diode means to said common point of relatively low impedance; said varactor diode means being coupled between said fourth stripline portion and the other end of said dielectrically loaded parallel strip transmission line means and located in a gap therebetween; and said idler circuit circulating an idler current and including said first inductive reactance means, second inductive reactance means selectively positioned with respect to said varactor diode means in said fourth stripline portion, and the parallel strip and suspended substrate stripline transmission line means segments lying between said first and second inductive reactance means on either side of said varactor diode means.
Claim 2
Dependent Claim
442 words
A parametric amplifier including a signal circuit, a pump circuit, and an idler circuit with varactor diode means located at the junction of the signal circuit and the pump circuit, comprising in combination: a section of microwave waveguide having a cavIty; said pump circuit supplying pump energy from an external source to one end of said section of waveguide and including, dielectrically loaded parallel strip transmission line means terminating at one end in said waveguide cavity, a waveguide to parallel strip transmission line transition coupling the other end of said parallel strip transmission line means to said external pump source, said parallel strip transmission line terminating in said transition, and first inductive reactance means selectively positioned with respect to said varactor diode means in said parallel strip transmission line means for matching said varactor diode means to the pump energy; said signal circuit commonly coupling a signal from an external signal circuit to and from the other end of said section of waveguide and including, suspended substrate stripline transmission line means located in said waveguide cavity for transforming the impedance of the external signal circuit and the varactor diode means to a common point of relatively low impedance and for obtaining a double tuned gain-bandpass characteristic, said suspended substrate stripline transmission line means comprising, a first stripline portion of selected geometry for reducing the magnitude of the external load resistance provided by said external signal circuit to a predetermined magnitude, a second stripline portion of selected geometry adjacent said first stripline portion and acting as a resonant circuit tuned to the frequency of said signal coupled to said signal circuit, a third stripline portion coupled to said first and second stripline portions, being of selected geometry and acting as a relatively low reactance section that parallely resonates with the reactance of the varactor diode means and forming said common point of relatively low impedance thereby, and a fourth stripline portion of selective geometry adjacent said third stripline portion and acting as an impedance inverter of the reactance of the reactor diode means to said common point of relatively low impedance; said varactor diode means being coupled between said fourth stripline portion and the other end of said dielectrically loaded parallel strip transmission line means and located in a gap therebetween; and said idler circuit circulating an idler current and including said first inductive reactance means, second inductive reactance means selectively positioned with respect to said varactor diode means in said fourth stripline portion, and the parallel strip and suspended substrate stripline transmission line means segments lying between said first and second inductive reactance means on either side of said varactor diode means.
Claim 3
Dependent Claim
16 words
The parametric amplifier as defined by claim 1 wherein said section of waveguide comprises rectangular waveguide.
Claim 4
Dependent Claim
64 words
The parametric amplifier as defined by claim 2 wherein said dielectrically loaded parallel strip transmission line means and said suspended substrate stripline transmission line means each comprises a dielectric substrate and an electrically conductive film on both sides of said substrate with the conductive film pattern on one side of said substrate being a mirror image of the conductor pattern on the other side.
Claim 5
Dependent Claim
29 words
The parametric amplifier as defined by claim 3 wherein said dielectrically loaded parallel strip transmission line means and said suspended substrate stripline transmission line means share a common substrate.
Claim 6
Dependent Claim
42 words
The parametric amplifier as defined by claim 4 wherein said varactor diode means comprises a pair of Schottky barrier diodes with one diode being mounted on each side of said substrate between respective parallel strip and suspended substrate stripline transmission line portions.
Claim 7
Dependent Claim
21 words
The parametric amplifier as defined by claim 5 wherein said pair of Schottky barrier diodes are comprised of beam leaded diodes.
Claim 8
Dependent Claim
32 words
The parametric amplifier as defined by claim 1 wherein said first and second inductive reactance means are comprised of electrically conductive poSts connecting the conductive film on both sides of said substrate.
Claim 9
Dependent Claim
149 words
The parametric amplifier as defined by claim 1 wherein said first stripline portion has a generally rectangular configuration of predetermined width and having a length in the order of one quarter wavelength of the signal frequency, said second stripline portion has a generally rectangular configuration of a length of selected multiples of one half wavelengths of said signal frequency and having a width relatively narrower than the width dimension of said first stripline portion, said third stripline portion has generally rectangular configuration and having a width substantially equal to the width of said first stripline portion and of a length substantially narrower than a quarter wavelength of said signal frequency, and wherein said fourth stripline portion has a generally rectangular configuration and having a length in the order of a quarter wavelength of said signal frequency and a width substantially equal to the width of said second line portion.
Claim 10
Dependent Claim
37 words
The parametric amplifier as defined by claim 8 and additionally including microwave energy absorbing material located in said waveguide section adjacent said waveguide to parallel strip transmission line transition for absorbing selected portions of said pump energy.
Claim 11
Dependent Claim
36 words
The parametric amplifier as defined by claim 1 wherein said waveguide cavity includes a pair of mutually parallel broad and narrow walls and wherein said common substrate is mounted in said narrow walls of said waveguide.
Claim 12
Dependent Claim
75 words
The parametric amplifier as defined by claim 10 wherein said transition comprises a ridged waveguide section including a pair of broad walls, a pair of narrow wall portions having a mutual separation less than the narrow walls of said section of waveguide, and a pair of opposed relatively narrow width stepped conductive elements mounted on said broad walls, said elements having a stepped mutual separation decreasing toward said dielectrically loaded parallel strip transmission line means.
References Cited (Backward Citations)
US3596197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |