US3750013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microstrip plasma probe
Assignee: United States Department of the Air Force
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Filing: 1970-10-21
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Granted: 1973-07-31
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Expires: 1990-10-21
Abstract
Abstract A microstrip cavity type transmission line having a lossy center conductor provides attenuation and reflection coefficient information in response to the disturbing effects of proximate conducting surfaces or plasma. Equivalent conductance and susceptance of the plasma and the proximity of conducting surfaces can be determined by using such information to solve standard transmission line formulas.
Inventors
- 👤 W Rotman
- 👤 N Karas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:30
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A diagnostic probe for measuring the physical parameters of plasma in the earth''s plasma layer comprising a section of microstrip transmission line having a lossy center conductor said center conductor having a discrete predetermined resistance value, a ground plane configured to define a microwave cavity, said microwave cavity having dimensions that support the propagation of TEM mode electromagnetic waves therein, and an input and an output, a signal generator, a first directional coupler, input signal measuring means, reflected signal measuring means, said first directional coupler connecting said signal generator, said microstrip transmission line input, said input signal measuring means and said reflected signal measuring means, a second directional coupler, a load matched to the characteristic impedance of said microstrip transmission line, and output signal measuring means, said second directional coupler connecting said microstrip transmission line output, said load and said output signal measuring means.
Claim 2
Dependent Claim
144 words
A diagnostic probe for measuring the physical parameters of plasma in the earth''s plasma layer comprising a section of microstrip transmission line having a lossy center conductor said center conductor having a discrete predetermined resistance value, a ground plane configured to define a microwave cavity, said microwave cavity having dimensions that support the propagation of TEM mode electromagnetic waves therein, and an input and an output, a signal generator, a first directional coupler, input signal measuring means, reflected signal measuring means, said first directional coupler connecting said signal generator, said microstrip transmission line input, said input signal measuring means and said reflected signal measuring means, a second directional coupler, a load matched to the characteristic impedance of said microstrip transmission line, and output signal measuring means, said second directional coupler connecting said microstrip transmission line output, said load and said output signal measuring means.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |