US3585533A
Expired / Lapsed
US
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Microwave microcircuit element with resistive high grequency energy absorber
Assignee: Unisys Corp
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Filing: 1970-02-26
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Granted: 1971-06-15
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Expires: 1990-02-26
Abstract
Abstract A high frequency or microwave microcircuit device is disclosed having application as an integrated circuit element for precise attenuation of high frequency or microwave energy or for the accurate termination of a transmission line carrying such energy. The novel microcircuit element is particularly adapted for use in planar integrated microstrip transmission line systems.
Inventors
- 👤 Roger M Denhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/24; H01P1/26; H01P1/268; H01P1/22; H01P1/227
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
In a microcircuit comprising a body of low-loss dielectric material with first and second surfaces: an electrically conductive ground layer bonded to a first of said surfaces, an electrically conductive planar transmission line bonded to a portion of a second of said surfaces, said transmission line comprising layers of first and second metals, said first metal layer comprising a continuous layer of an electrically resistive metal bonded by vacuum evaporation to said dielectric material, said second metal layer comprising a layer of a highly electrically conductive metal bonded by vacuum evaporation to said first metal layer, said second metal layer extending over less than the total of said first layer so as to leave a part of said first layer exposed to high frequency energy propagated by said transmission line for absorption of at least a portion thereof.
Claim 2
Dependent Claim
138 words
In a microcircuit comprising a body of low-loss dielectric material with first and second surfaces: an electrically conductive ground layer bonded to a first of said surfaces, an electrically conductive planar transmission line bonded to a portion of a second of said surfaces, said transmission line comprising layers of first and second metals, said first metal layer comprising a continuous layer of an electrically resistive metal bonded by vacuum evaporation to said dielectric material, said second metal layer comprising a layer of a highly electrically conductive metal bonded by vacuum evaporation to said first metal layer, said second metal layer extending over less than the total of said first layer so as to leave a part of said first layer exposed to high frequency energy propagated by said transmission line for absorption of at least a portion thereof.
Claim 3
Dependent Claim
23 words
Apparatus as described in claim 1 wherein said dielectric material is aluminum oxide with a dielectric loss tangent of substantially 0.001 or less.
Claim 4
Dependent Claim
18 words
Apparatus as described in claim 2 wherein said first layer is chromium and said second layer is gold.
Claim 5
Dependent Claim
16 words
Apparatus as described in claim 3 wherein said gold layer comprises at least two constituent layers.
Claim 6
Dependent Claim
17 words
Apparatus as in claim 3 wherein said chromium layer is substantially 200 to substantially 1500 Angstroms thick.
Claim 7
Dependent Claim
17 words
Apparatus as in claim 3 wherein said gold layer is substantially 6 to substantially 8 microns thick.
Claim 8
Dependent Claim
24 words
Apparatus as described by claim 1 wherein the resistivity of said chromium layer is substantially equal to the characteristic impedance of said transmission line.
Claim 9
Dependent Claim
28 words
Apparatus as described in claim 1 wherein the said exposed part of said chromium layer has a length substantially equal to one-half the width of said transmission line.
Claim 10
Dependent Claim
25 words
Apparatus as described in claim 1 wherein the said exposed part of chromium layer separates first and second mutually noncontacting portions of said gold layer.
Claim 11
Dependent Claim
83 words
Apparatus as described by claim 9 wherein said second of said first and second mutually noncontacting portions of said gold layer forms a quarter wave reflecting stub transmission line at the operating wave length for the reflection of high frequency energy at the junction of said chromium layer and said second gold layer. Apparatus as described by claim 9 wherein said second of said first and second portions of said gold layer forms a transmission line adapted to be coupled to utilization equipment.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |