US3848198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave transmission line and devices using multiple coplanar conductors
Assignee: RCA Corp
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Filing: 1973-09-27
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Granted: 1974-11-12
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Expires: 1993-09-27
Abstract
Abstract Three coplanar conductive surfaces on the top surface of a dielectric substrate form a microwave transmission line having first and second transmission modes used in the construction and operation of various microwave devices, such as amplifiers and directional couplers.
Inventors
- 👤 Brecht R De
- 👤 L Napoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:39
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
461 words
Apparatus for amplifying electromagnetic energy over a predetermined band of frequencies comprising: a dielectric substrate having a predetermined dielectric constant; an input circuit having first, second and third coplanar striplike conductors each having input and output ends and predetermined widths and lengths adjacent to one surface of said dielectric substrate, said first conductor having one edge separated from an adjacent edge of said second conductor by a first predetermined gap and an edge opposite said one edge separated from an adjacent edge of said third conductor by a second predetermined gap; means for establishing a predetermined D.C. potential at said input ends respectively of said second and third conductors of said input circuit, whereby said first, second and third conductor input ends, said dielectric constant and said first and second predetermined gaps form an unbalanced transmission line input terminal: means for connecting said output ends of said second and first Conductors of said input circuit, whereby said first and second conductor output connected ends, said third conductor output end, said dielectric constant and said first and second predetermined gaps form a balanced transmission line input terminal; an output circuit having first, second and third coplanar striplike conductors each having input and output ends and predetermined widths and lengths adjacent to one surface of said substrate, said first conductor of said output circuit being separated from an adjacent edge of said second conductor by a first predetermined gap and an edge opposite said one edge separated from an adjacent edge of said third conductor by a second predetermined gap; means for establishing a predetermined D.C. potential at said output ends of said second and third conductors of said output circuit, whereby said first, second and third conductor output ends of said output circuit, said dielectric constant, and said first and second predetermined gaps of said output circuit form an unbalanced transmission line input terminal; means for connecting said input ends of said second and first conductors of said output circuit, whereby said first and second conductor input connected ends of said output circuit, said third conductor input end, said dielectric constant and said first and second predetermined gaps of said output circuits form a balanced transmission line input terminal; a first electromagnetic energy amplifying device having a first electrode coupled to said third conductor output end of said input circuit, a second electrode coupled to said third conductor input end of said output circuit and a third electrode at said predetermined D.C. potential; a second electromagnetic energy amplifying device having a first electrode coupled to said first and second conductor output connected ends of said input circuit, a second electrode coupled to said first and second conductor input connected ends of said output circuit and a third electrode at said d.c. potential.
Claim 2
Dependent Claim
461 words
Apparatus for amplifying electromagnetic energy over a predetermined band of frequencies comprising: a dielectric substrate having a predetermined dielectric constant; an input circuit having first, second and third coplanar striplike conductors each having input and output ends and predetermined widths and lengths adjacent to one surface of said dielectric substrate, said first conductor having one edge separated from an adjacent edge of said second conductor by a first predetermined gap and an edge opposite said one edge separated from an adjacent edge of said third conductor by a second predetermined gap; means for establishing a predetermined D.C. potential at said input ends respectively of said second and third conductors of said input circuit, whereby said first, second and third conductor input ends, said dielectric constant and said first and second predetermined gaps form an unbalanced transmission line input terminal: means for connecting said output ends of said second and first Conductors of said input circuit, whereby said first and second conductor output connected ends, said third conductor output end, said dielectric constant and said first and second predetermined gaps form a balanced transmission line input terminal; an output circuit having first, second and third coplanar striplike conductors each having input and output ends and predetermined widths and lengths adjacent to one surface of said substrate, said first conductor of said output circuit being separated from an adjacent edge of said second conductor by a first predetermined gap and an edge opposite said one edge separated from an adjacent edge of said third conductor by a second predetermined gap; means for establishing a predetermined D.C. potential at said output ends of said second and third conductors of said output circuit, whereby said first, second and third conductor output ends of said output circuit, said dielectric constant, and said first and second predetermined gaps of said output circuit form an unbalanced transmission line input terminal; means for connecting said input ends of said second and first conductors of said output circuit, whereby said first and second conductor input connected ends of said output circuit, said third conductor input end, said dielectric constant and said first and second predetermined gaps of said output circuits form a balanced transmission line input terminal; a first electromagnetic energy amplifying device having a first electrode coupled to said third conductor output end of said input circuit, a second electrode coupled to said third conductor input end of said output circuit and a third electrode at said predetermined D.C. potential; a second electromagnetic energy amplifying device having a first electrode coupled to said first and second conductor output connected ends of said input circuit, a second electrode coupled to said first and second conductor input connected ends of said output circuit and a third electrode at said d.c. potential.
Claim 3
Dependent Claim
43 words
Apparatus according to claim 1, wherein said input circuit first, second and third conductors each have an electrical length between said input and output ends of substantially lambda /4, where lambda is the wavelength at the center freqeuncy of said band of frequencies.
Claim 4
Dependent Claim
43 words
Apparatus according to claim 1, wherein said output circuit first, second and third conductors each have an electrical length between said input and output ends of substantially lambda /4, where lambda is the wavelength at the center frequency of said band of frequencies.
References Cited (Backward Citations)
US3560893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |