US3869681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave cavity oscillator having a frequency tuning element
Assignee: Johnson Service Co
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Filing: 1972-08-30
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Granted: 1975-03-04
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Expires: 1992-08-30
Abstract
Abstract An open ended microwave cavity oscillator comprises a microwave diode forming part of a coaxial center conductor secured to the cavity''s base wall. A tuning rod of low loss dielectric material is threaded into the cavity to capacitively tune the oscillator''s frequency. A varactor diode is mounted within the center of the tuning rod and is connected between an external supply voltage and ground via a ground wire which projects out of the rod and is bent rearwardly to constitute a coupling loop. The varactor diode is connected to a voltage supply for frequency tuning and modulation of the oscillator output.
Inventors
- 👤 Carl F Klein
- 👤 Lawrence B Korta
- 👤 James R Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:18
CPC Classifications
H; H03; H03B; H03B7/00; H03B7/12; H03B7/14; H03B7/143; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A microwave cavity oscillator tuning element for tuning of the cavity frequency of a cavity oscillator comprising a dielectric tuning means movably mounted within a cavity opening of said cavity oscillator and having an inner end, said dielectric tuning means constituting a first means to tune the cavity frequency, a voLtage variable capacitor means mounted for movement with said dielectric tuning means and having an input terminal means and a coupling conductor means extending from the inner end of the dielectric tuning means, said variable capacitor means constituting a second means to further tune the cavity frequency.
Claim 2
Dependent Claim
97 words
A microwave cavity oscillator tuning element for tuning of the cavity frequency of a cavity oscillator comprising a dielectric tuning means movably mounted within a cavity opening of said cavity oscillator and having an inner end, said dielectric tuning means constituting a first means to tune the cavity frequency, a voLtage variable capacitor means mounted for movement with said dielectric tuning means and having an input terminal means and a coupling conductor means extending from the inner end of the dielectric tuning means, said variable capacitor means constituting a second means to further tune the cavity frequency.
Claim 3
Dependent Claim
50 words
The microwave cavity oscillator tuning element of claim 1 wherein said dielectric tuning means is rotatably mounted within the opening, and said coupling conductor means is looped rearwardly over the inner end of the dielectric tuning means to establish a coupling independently of the angular orientation of the conductor means.
Claim 4
Dependent Claim
14 words
The tuning element of claim 1 wherein said variable capacitor is a varactor diode.
Claim 5
Dependent Claim
99 words
A microwave cavity oscillator tuning element comprising a dielectric tuning means including an outer mounting means for adjustable mounting of the dielectric tuning means within a cavity opening with an inner end within the cavity and constituting a first means for substantially tuning the cavity frequency, a varactor diode means located within said dielectric tuning means and having an input terminal means extending outwardly of the dielectric tuning means and a coupling conductor means extending out of the inner end of the dielectric tuning means, and said diode means constituting a second means for substantially tuning the cavity frequency.
Claim 6
Dependent Claim
99 words
A microwave cavity oscillator tuning element comprising a dielectric tuning means including an outer mounting means for adjustable mounting of the dielectric tuning means within a cavity opening with an inner end within the cavity and constituting a first means for substantially tuning the cavity frequency, a varactor diode means located within said dielectric tuning means and having an input terminal means extending outwardly of the dielectric tuning means and a coupling conductor means extending out of the inner end of the dielectric tuning means, and said diode means constituting a second means for substantially tuning the cavity frequency.
Claim 7
Dependent Claim
102 words
The tuning element of claim 4 wherein said dielectric tuning means includes an outer tubular element defining a ground means and said diode means includes oppositely projecting end studs extending coaxially of the tuning means, said terminal means including a first connector connected to the one stud and projecting outwardly coaxially of the tuning means, a support member aligned with the outer end of the connector and rotatably mounted into said tuning element, insulating means attaching said connector to said support member, and said coupling conductor extending back along the exterior of the dielectric tuning means and connected to said tubular element.
Claim 8
Dependent Claim
69 words
The tuning element of claim 4 wherein said dielectric tuning means includes a tubular dielectric element and an outer tubular pipe member having internal and external mounting threads and being threaded onto one end of said dielectric element, said diode means being located within the inner end of the tuning element, and including a mounting plug threaded to said tubular pipe member and connected to support said diode means.
Claim 9
Dependent Claim
82 words
The tuning element of claim 4 wherein said diode means is located within the inner end of the dielectric tuning means and includes oppositely projecting end connections, said input terminal means including a connector attached to one connection and projecting outwardly coaxially of the dielectric tuning means, a supporting member aligned with the outer end of the connector and including an insulating means attached to said connector to define a feed through capacitive mounting of said connector to said dielectric tuning means.
Claim 10
Dependent Claim
106 words
A solid state microwave cavity oscillator for generating microwave energy comprising, a microwave cavity housing having an open-ended cavity, a microwave diode means secured in the lower end of the cavity, a dielectric tuning element adjustably mounted in the open end of said cavity in spaced, coupled relationship to said diode means for substantially tuning the frequency of the oscillator and establishing a base frequency of the oscillator, and a varactor diode mounted within the inner end of the tuning element and having an input terminal means for selectively electrically controlling and fine tuning of the frequency of the oscillator with respect to said base frequency.
Claim 11
Dependent Claim
106 words
A solid state microwave cavity oscillator for generating microwave energy comprising, a microwave cavity housing having an open-ended cavity, a microwave diode means secured in the lower end of the cavity, a dielectric tuning element adjustably mounted in the open end of said cavity in spaced, coupled relationship to said diode means for substantially tuning the frequency of the oscillator and establishing a base frequency of the oscillator, and a varactor diode mounted within the inner end of the tuning element and having an input terminal means for selectively electrically controlling and fine tuning of the frequency of the oscillator with respect to said base frequency.
Claim 12
Dependent Claim
76 words
The cavity oscillator of claim 8 wherein said varactor diode includes oppositely projecting end terminals, a first connector secured to one terminal end projecting outwardly to define a voltage input terminal means, an insulating means attaching said connector to said housing to define a bypass capacitive mounTing, and a coupling conductor secured to the second terminal and extending back along the exterior of the element and connected to said housing to define a diode coupling loop.
Claim 13
Dependent Claim
42 words
The cavity oscillator of claim 9 wherein said dielectric tuning element is rotatably mounted about an axis normal to the plane of the magnetic field within the cavity such that the coupling is independent of the angular orientation of the coupling loop.
Claim 14
Dependent Claim
33 words
The microwave cavity oscillator of claim 8 including a power supply of fixed amplitude output and a variable coupling between the supply and the input means for fine tuning of the oscillator frequency.
Claim 15
Dependent Claim
35 words
The microwave cavity oscillator of claim 8 including a power supply connected to said input terminal means, the output amplitude of said power supply varying in a preselected sequence to correspondingly modulate the oscillator frequency.
Claim 16
Dependent Claim
36 words
The microwave cavity oscillator of claim 8 including a power supply connected to said input terminal means and establishing time spaced direct current signals of different amplitude to create a diplex output of two preselected frequencies.
Claim 17
Dependent Claim
45 words
The tuning element of claim 8 wherein said dielectric tuning means includes a tuning dielectric element attached to an outer conductive element defining a ground connection, and a coupling connector extending back along the exterior of the dielectric element and connected to said conductive element.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |