Patent US5225796A successfully refreshed from Google Patents.
US5225796A
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Coplanar transmission structure having spurious mode suppression
Assignee: Tektronix Inc
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Filing: 1992-01-27
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Granted: 1993-07-06
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Expires: 2012-01-27
Abstract
Abstract An improved coplanar transmission structure has a coplanar transmission line formed on one surface of a substrate and a lossy resistive material formed on the opposite surface of the substrate for suppressing spurious electromagnetic modes propagating through the substrate. The lossy resistive material may be nichrome or the like and is patterned on the substrate using thin or thick film processing.
Inventors
- 👤 Frank R. Williams
- 👤 Thomas G. Ruttan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:04
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/003; G; G01; G01R; G01R1/00; G01R1/02; G01R1/06; G01R1/067; G01R1/06772
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
65 words
An improved coplanar transmission structure including a coplanar transmission line formed on one surface of a substrate for propagating a primary electromagnetic mode defined by the coplanar transmission line, the improvement comprising a photolithographic layer of lossy resistive material formed on the opposite surface of the substrate for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary electromagnetic mode.
Claim 2
Dependent Claim
65 words
An improved coplanar transmission structure including a coplanar transmission line formed on one surface of a substrate for propagating a primary electromagnetic mode defined by the coplanar transmission line, the improvement comprising a photolithographic layer of lossy resistive material formed on the opposite surface of the substrate for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary electromagnetic mode.
Claim 3
Dependent Claim
30 words
The improved coplanar transmission structure as recited in claim 1 further comprising a layer of lossy material formed on side surfaces of the substrate extending between the opposing substrate surfaces.
Claim 4
Dependent Claim
17 words
The improved coplanar transmission structure as recited in claim 2 wherein the lossy resistive material comprises nichrome.
Claim 5
Dependent Claim
19 words
The improved coplanar transmission structure as recited in claim 1 wherein the coplanar transmission line comprises a coplanar waveguide.
Claim 6
Dependent Claim
19 words
The improved coplanar transmission structure as recited in claim 1 wherein the coplanar transmission line comprises a coplanar stripline.
Claim 7
Dependent Claim
18 words
The improved coplanar transmission structure as recited in claim 1 wherein the coplanar transmission line comprises a slotline.
Claim 8
Dependent Claim
72 words
A coplanar transmission structure comprising: a substrate having opposing parallel surfaces and side surfaces; a coplanar transmission line formed on one of the opposing parallel surfaces for propagating a primary electromagnetic mode defined by the coplanar transmission line; and a photolithographic lossy resistive layer formed on the opposite surface from the coplanar transmission line for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary electromagnetic mode.
Claim 9
Dependent Claim
72 words
A coplanar transmission structure comprising: a substrate having opposing parallel surfaces and side surfaces; a coplanar transmission line formed on one of the opposing parallel surfaces for propagating a primary electromagnetic mode defined by the coplanar transmission line; and a photolithographic lossy resistive layer formed on the opposite surface from the coplanar transmission line for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary electromagnetic mode.
Claim 10
Dependent Claim
23 words
The coplanar transmission structure as recited in claim 7 further comprising a layer of lossy material formed on side surfaces of the substrate.
Claim 11
Dependent Claim
16 words
The coplanar transmission structure as recited in claim 8 wherein the lossy resistive material comprises nichrome.
Claim 12
Dependent Claim
19 words
The improved coplanar transmission structure as recited in claim 7 wherein the coplanar transmission line comprises a coplanar waveguide.
Claim 13
Dependent Claim
19 words
The improved coplanar transmission structure as recited in claim 7 wherein the coplanar transmission line comprises a coplanar stripline.
Claim 14
Dependent Claim
18 words
The improved coplanar transmission structure as recited in claim 7 wherein the coplanar transmission line comprises a slotline.
Claim 15
Dependent Claim
69 words
An improved microwave probe having a coplanar transmission line formed on one surface of a substrate for propagating a primary mode of electromagnetic radiation defined by the coplanar transmission line, the improvement comprising a photolithographic layer of lossy resistive material selectively covering one or more surfaces of the substrate for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary mode of electromagnetic radiation.
Claim 16
Dependent Claim
69 words
An improved microwave probe having a coplanar transmission line formed on one surface of a substrate for propagating a primary mode of electromagnetic radiation defined by the coplanar transmission line, the improvement comprising a photolithographic layer of lossy resistive material selectively covering one or more surfaces of the substrate for suppressing electromagnetic modes propagating through and around the substrate that are spurious to the primary mode of electromagnetic radiation.
Claim 17
Dependent Claim
28 words
The improved microwave probe as recited in claim 13 wherein the lossy resistive material is patterned on the substrate for providing selective suppression of parasitic modes of radiation.
Claim 18
Dependent Claim
16 words
The improved microwave probe as recited in claim 13 wherein the resistive lossy material is nichrome.
Claim 19
Dependent Claim
18 words
The improved microwave probe as recited in claim 13 wherein the coplanar transmission line comprises a coplanar stripline.
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) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |