US3754197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meander-line impedance transformer
Assignee: SRI International Inc
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Filing: 1972-05-18
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Granted: 1973-08-21
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Expires: 1992-05-18
Abstract
Abstract A microwave or UHF impedance transformer is provided which is comprised of a meander-line structure, or a hybrid meander-line structure, in which coupling between some conjugate (adjacent) turns in the line is negligible, whereas for other conjugate turns it is significant.
Inventors
- 👤 E Cristal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:43
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
The new use of a meander-line structure as a folded, coupled line for impedance transformation in which turns of quarter wavelength are provided with significant coupling between conjugate parallel turns in at least one section between one input port and one output port.
Claim 2
Dependent Claim
43 words
The new use of a meander-line structure as a folded, coupled line for impedance transformation in which turns of quarter wavelength are provided with significant coupling between conjugate parallel turns in at least one section between one input port and one output port.
Claim 3
Dependent Claim
49 words
The invention as defined in claim 1 wherein at least two sections are provided with parallel turns, conjugate turns of each section being provided with significant coupling therebetween, and conjugate turns between sections being provided with insignificant coupling therebetween whereby a hybrid meander-line structure is provided for impedance transformation.
Claim 4
Dependent Claim
16 words
The invention as defined in claim 1 wherein said meander-line structure is provided in stripline form.
Claim 5
Dependent Claim
16 words
The invention as defined in claim 1 wherein said meander-line structure is provided in microwave-integrated-circuit form.
Claim 6
Dependent Claim
16 words
The invention as defined in claim 2 wherein said meander-line structure is provided in stripline form.
Claim 7
Dependent Claim
16 words
The invention as defined in claim 2 wherein said meander-line structure is provided in microwave-integrated-circuit form.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |