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US3796964A
Expired / Lapsed
US
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Negative conductivity amplifiers and oscillators
Assignee: MINI TECHNOLOGY
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Filing: 1972-03-14
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Granted: 1974-03-12
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Expires: 1992-03-14
Abstract
Abstract A solid state negative conductivity amplifier or oscillator in which a transverse electromagnetic wave is propagated inside a body of negative conductivity material. By varying the dimensions and the conductivity of the body of material and the surface reflection co-efficients the device can be made into a broadband amplifier, a narrow band amplifier or an oscillator.
Inventors
- 👤 A Baynham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/12; H03B7/14; H03F; H03F3/00; H03F3/54; H03F3/55; H10; H10N; H10N80/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A solid state negative conductivity device comprising: a transmission line defining a direction of propagation of electromagnetic waves; a body of material having a region of negative slope in its voltage/current characteristic, said body having dimensions transverse to said direction of propagation of electromagnetic waves sufficient to fill at least a substantial part of said transmission line and having a dimension in said direction of propagation of electromagnetic waves at least one half wavelength of electromagnetic waves in said body of material; means for applying a direct electric field to said body of material in a direction perpendicular to said direction of propagation of electromagnetic waves, electromagnetic waves being propagated in said direction of propagation having an oscillatory electric vector parallel to said direct electric field, the magnitude of said direct electric field being such that said oscillatory electric vector will oscillate entirely in said region of negative slope in the voltage/current characteristic of said material; and means for extracting a transverse electromagnetic wave from said body of material.
Claim 2
Dependent Claim
169 words
A solid state negative conductivity device comprising: a transmission line defining a direction of propagation of electromagnetic waves; a body of material having a region of negative slope in its voltage/current characteristic, said body having dimensions transverse to said direction of propagation of electromagnetic waves sufficient to fill at least a substantial part of said transmission line and having a dimension in said direction of propagation of electromagnetic waves at least one half wavelength of electromagnetic waves in said body of material; means for applying a direct electric field to said body of material in a direction perpendicular to said direction of propagation of electromagnetic waves, electromagnetic waves being propagated in said direction of propagation having an oscillatory electric vector parallel to said direct electric field, the magnitude of said direct electric field being such that said oscillatory electric vector will oscillate entirely in said region of negative slope in the voltage/current characteristic of said material; and means for extracting a transverse electromagnetic wave from said body of material.
Claim 3
Dependent Claim
68 words
A solid state device as in claim 1 constituting an amplifier and further comprising means for feeding a transverse electromagnetic wave into said body of material, the product of the free carrier concentration and the length of said body in said direction of propagation of transverse electromagnetic waves being great enough for the amplifier gain to overcome the transmission loss through the surfaces of the body of material.
Claim 4
Dependent Claim
35 words
A solid state device as in claim 1 wherein the magnitude of said direct electric field applied to said materials is such as to bias said body of material into its negative differential conductivity region.
Claim 5
Dependent Claim
14 words
A solid state device as in claim 3 wherein said material is indium phosphide.
Claim 6
Dependent Claim
46 words
A solid state device as in claim 1 wherein the magnitude of said direct electric field applied to said material is such as to bias said body of material with a field slightly less than the minimum field in which the material exhibits negative differential conductivity.
Claim 7
Dependent Claim
15 words
A solid state device as in claim 1 wherein said transmission line comprises a stripline.
Claim 8
Dependent Claim
19 words
A solid state device as in claim 1 including means for feeding a transverse electromagnetic wave to said body.
Claim 9
Dependent Claim
29 words
A solid state device as in claim 7 wherein said transverse electromagnetic wave fed to said body has a frequency twice the oscillation frequency of said oscillatory electric vector.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |