Patent US3882420A successfully refreshed from Google Patents.
US3882420A
Expired / Lapsed
US
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Magnetically tunable ferrite stripline trapatt mode oscillator and amplifier circuits
Assignee: RCA Corp
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Filing: 1974-05-24
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Granted: 1975-05-06
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Expires: 1994-05-24
Abstract
Abstract An active element for generating signals in a Trapatt mode at a desired frequency is included in a transmission line circuit on a ferrite substrate. The transmission line circuit has a first magnetically tunable portion determining the desired frequency of operation and a second portion having an automatic magnetically tunable impedance for operating the element in the Trapatt mode.
Inventors
- 👤 Shing-Gong Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:26
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/142; H03F; H03F3/00; H03F3/04; H03F3/10; H10; H10W; H10W44/00; H10W44/20; H10W44/203; H10W44/216
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
Apparatus comprising: an active element having at least two input terminals and exhibiting a current-voltage characteristic including a negative resistance portion for causing said element to operate in a Trapatt mode in response to a bias signal exceeding a predetermined threshold magnitude; a transmission line circuit on a ferrite substrate including said element operating in said Trapatt mode and generating signals at a desired frequency during periods when said bias signal exceeds said predetermined threshold magnitude, said transmission line circuit having a first magnetically tunable portion determining said desired frequency and a second portion having a magnetically tunable impedance for operating said element in said Trapatt mode.
Claim 2
Dependent Claim
107 words
Apparatus comprising: an active element having at least two input terminals and exhibiting a current-voltage characteristic including a negative resistance portion for causing said element to operate in a Trapatt mode in response to a bias signal exceeding a predetermined threshold magnitude; a transmission line circuit on a ferrite substrate including said element operating in said Trapatt mode and generating signals at a desired frequency during periods when said bias signal exceeds said predetermined threshold magnitude, said transmission line circuit having a first magnetically tunable portion determining said desired frequency and a second portion having a magnetically tunable impedance for operating said element in said Trapatt mode.
Claim 3
Dependent Claim
40 words
Apparatus according to claim 1, further comprising: means for coupling a D.C. bias signal to said element, said D.C. bias signal having a magnitude exceeding said predetermined threshold magnitude, whereby said element is triggered into operating in said Trapatt mode.
Claim 4
Dependent Claim
59 words
Apparatus according to claim 1, further comprising: means for coupling to said element a combination of a D.C. bias signal having a magnitude less than said predetermined threshold magnitude and a microwave signal, said combination of D.C. and microwave signals having a magnitude exceeding said predetermined threshold magnitude, whereby said element is triggered into operating in said Trapatt mode.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 1, further comprising: means for coupling to said ferrite substrate a longitudinal D.C. magnetic field.
Claim 6
Dependent Claim
41 words
Apparatus according to claim 4, wherein said D.C. magnetic field coupling means is a coil wound around said ferrite substrate for inducing in said ferrite substrate said longitudinal D.C. magnetic field in response to a current signal coupled to said coil.
Claim 7
Dependent Claim
15 words
Apparatus according to claim 4, wherein said D.C. magnetic field coupling means is an electromagnet.
Claim 8
Dependent Claim
63 words
Apparatus according to claim 1, wherein said transmission line circuit is a low-pass filter separated from said element by a conductor having an electrical length of gamma /2, where gamma is transmission line wavelength at said desired frequency, said filter having a pass-band including said desired frequency and a stopband for reflecting element generated signals at frequencies harmonically related to said desired frequency.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |