US3909746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
YIG-tuned push-pull microwave diode oscillator
Assignee: Varian Medical Systems Inc
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Filing: 1974-06-17
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Granted: 1975-09-30
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Expires: 1994-06-17
Abstract
Abstract A microwave oscillator includes first and second Gunn effect diodes coupled to a YIG sphere by a loop. The Gunn effect diodes are mechanically and d.c. electrically connected to said loop on opposite sides of the sphere, which is magnetically coupled to a central portion of the loop so that there is an a.c. connection between the diodes and sphere, which a.c. connection is at least approximately push-pull. A d.c. bias connection through the loop is established in parallel to the diodes. An output loop orthogonal to the first loop is magnetically coupled to the sphere.
Inventors
- 👤 Wayne G Abraham
- 👤 Robert T Oyafuso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:45
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/142
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
102 words
A microwave oscillator comprising first and second twoterminal negative resistance devices capable of oscillating over a band of microwave frequencies, a tunable high Q filter resonant to frequencies in the band, said filter including a crystal having molecules with magnetic moments precessed at a rate determined by a magnetic field applied thereto, said precession rate determining the filter resonant frequency, first means for coupling microwave energy between said devices and said crystal so that the devices are operated at least approximately in a push-pull configuration, and second means coupled to the crystal for deriving output microwave energy at the filter resonant frequency.
Claim 2
Dependent Claim
102 words
A microwave oscillator comprising first and second twoterminal negative resistance devices capable of oscillating over a band of microwave frequencies, a tunable high Q filter resonant to frequencies in the band, said filter including a crystal having molecules with magnetic moments precessed at a rate determined by a magnetic field applied thereto, said precession rate determining the filter resonant frequency, first means for coupling microwave energy between said devices and said crystal so that the devices are operated at least approximately in a push-pull configuration, and second means coupled to the crystal for deriving output microwave energy at the filter resonant frequency.
Claim 3
Dependent Claim
55 words
The microwave oscillator as claimed in claim 1, wherein the first device has a tendency to oscillate at a frequency lower than the second device, and the first means for coupling provides, in the band, a higher impedance between the crystal and the first device than the impedance between the crystal and the second device.
Claim 4
Dependent Claim
48 words
The microwave oscillator as claimed in claim 1, wherein the first and second devices have a tendency to oscillate at approximately the same frequency, and the means for coupling provides, in the band, approximately the same impedance between the crystal and each of the first and second devices.
Claim 5
Dependent Claim
32 words
The microwave oscillator as claimed in claim 1, wherein the first and second coupling means are respectively first and second conductive loops orthogonal to each other and magnetically coupled to the crystal.
Claim 6
Dependent Claim
62 words
The microwave oscillator of claim 4, wherein a central portion of the first loop is magnetically coupled to the crystal, said loop extending in opposite directions from the crystal, said first and second devices being respectively mechanically and electrically connected to said loop on opposite sides of the crystal, and means for establishing d.c. bias connections through the loop to the devices.
Claim 7
Dependent Claim
51 words
The microwave oscillator of claim 5, wherein the first device has a tendency to oscillate at frequencies lower than the second device, the length of the loop between the central portion and the first device being greater than the length of the loop between the central portion and the second device.
Claim 8
Dependent Claim
42 words
The microwave oscillator of claim 5 wherein the first and second devices have a tendency to oscillate at approximately the same frequencies, the length of the loop between the central portion and both the first and second devices being approximately the same.
Claim 9
Dependent Claim
23 words
The microwave oscillator of claim 5, further including an r.f. by-pass capacitor having an electrode contacting the central portion of the first loop.
Claim 10
Dependent Claim
21 words
The microwave oscillator of claim 5, wherein said central portion is bent to extend around a substantiaL portion of the crystal.
Claim 11
Dependent Claim
92 words
A microwave oscillator comprising first and second two-terminal transit time microwave negative resistance devices, a sphere of ferrimagnetic material, a first metal loop extending in opposite directions from the sphere, a central portion of the first loop being magnetically coupled to the sphere, said first and second devices being respectively mechanically and electrically connected to said loop on opposite sides of the sphere, means for establishing a d.c. bias connection through the loop to the devices, and a metal output loop orthogonal to the first loop and magnetically coupled to the sphere.
Claim 12
Dependent Claim
92 words
A microwave oscillator comprising first and second two-terminal transit time microwave negative resistance devices, a sphere of ferrimagnetic material, a first metal loop extending in opposite directions from the sphere, a central portion of the first loop being magnetically coupled to the sphere, said first and second devices being respectively mechanically and electrically connected to said loop on opposite sides of the sphere, means for establishing a d.c. bias connection through the loop to the devices, and a metal output loop orthogonal to the first loop and magnetically coupled to the sphere.
Claim 13
Dependent Claim
25 words
The microwave oscillator of claim 10, wherein said central portion is bent to have approximately a semicircular shape that is substantially concentric with the sphere.
Claim 14
Dependent Claim
19 words
The microwave of fo claim 11, further including an r.f. by-pass capacitor having an electrode contacting said central portion.
Claim 15
Dependent Claim
51 words
The microwave oscillator of claim 10, wherein the first device has a tendency to oscillate at frequencies lower than the second device, the length of the loop between the central portion and the first device being greater than the length of the loop between the central portion and the second device.
Claim 16
Dependent Claim
42 words
The microwave oscillator of claim 10, wherein the first and second devices have a tendency to oscillate at approximately the same frequencies, the length of the loop between the central portion and both the first and second devices being approximately the same.
Claim 17
Dependent Claim
29 words
The oscillator of claim 5 wherein the ends of said loop extend away from said crystal past said devices, said ends being electrically connected to a common conductive block.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |