Patent US2760767A successfully refreshed from Google Patents.
Patent US4371849A successfully refreshed from Google Patents.
US4371849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Evanescent-mode microwave oscillator
Assignee: US Philips Corp
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Filing: 1980-03-19
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Granted: 1983-02-01
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Expires: 2000-03-19
Abstract
Abstract A microwave evanescent-mode oscillator comprises a length of waveguide W1 having a cut-off frequency higher than the working frequency of the oscillator together with a Gunn element G disposed within the waveguide characterized in that the oscillator comprises, spaced in sequence along the waveguide a Gunn element G post-coupled into the waveguide and spaced from a first end of the waveguide, a capacitive member C and at the other end of the waveguide an end wall formed by a diaphragm D having therein an output aperture I for coupling out energy from the waveguide.
Inventors
- 👤 Stuart R. Longley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:55
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A microwave evanescent-mode oscillator comprising a length of rectangular waveguide having a cut-off frequency higher than the working frequency of the oscillator together with a Gunn element disposed within the waveguide characterised in that the oscillator comprises, spaced in sequence along the longitudinal axis of the waveguide, the Gunn element post-coupled into the waveguide and spaced from a first end of the waveguide, a capacitive member and at the opposite end of the waveguide an end wall perpendicular to said longitudinal axis having therein an output aperture for coupling out energy at said working frequency from the waveguide.
Claim 2
Dependent Claim
98 words
A microwave evanescent-mode oscillator comprising a length of rectangular waveguide having a cut-off frequency higher than the working frequency of the oscillator together with a Gunn element disposed within the waveguide characterised in that the oscillator comprises, spaced in sequence along the longitudinal axis of the waveguide, the Gunn element post-coupled into the waveguide and spaced from a first end of the waveguide, a capacitive member and at the opposite end of the waveguide an end wall perpendicular to said longitudinal axis having therein an output aperture for coupling out energy at said working frequency from the waveguide.
Claim 3
Dependent Claim
17 words
An oscillator as claimed in claim 1 characterised in that the capacitive member is a dielectric post.
Claim 4
Dependent Claim
17 words
An oscillator as claimed in claim 1 characterised in that the capacitive member is a metal post.
Claim 5
Dependent Claim
31 words
An oscillator as claimed in claim 1 characterised in that the penetration into the waveguide of the capacitive member is adjustable whereby the tuning of the oscillator can be varied mechanically.
Claim 6
Dependent Claim
16 words
An oscillator as claimed in claim 1 characterised in that the capacitive member is a varactor.
Claim 7
Dependent Claim
32 words
An oscillator as claimed in claim 1 characterised in that the output aperture couples into a second length of waveguide which has a cut-off frequency below the working frequency of the oscillator.
Claim 8
Dependent Claim
22 words
An oscillator as claimed in claim 6 characterised in that the second length of waveguide is provided with an adjustable tuning screw.
Claim 9
Dependent Claim
23 words
An oscillator as claimed in claim 1 characterised in that the said first end of the waveguide is terminated in a short circuit.
Claim 10
Dependent Claim
19 words
An oscillator as claimed in claim 1 characterised in that the said first end of the waveguide is open.
References Cited (Backward Citations)
US3919666A
Cited
US4305049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |