US3836875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave limiter having variable capacitance diode in tuned cavity
Assignee: Ferranti International PLC
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Filing: 1973-01-17
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Granted: 1974-09-17
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Expires: 1993-01-17
Abstract
Abstract A microwave-frequency power limiting device comprises a voltagesensitive reactance arranged to form a tuned circuit having a resonant frequency dependent upon the power applied to the device. The tuned circuit is coupled to an input transmission line by a step-up transformer.
Inventors
- 👤 J Duncan
- 👤 C Hannaford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:09
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/02; H03G11/025; H01; H01P; H01P1/00; H01P1/22; H01P1/222; H02; H02H; H02H9/00; H02H9/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A microwave-frequency power-limiting device arranged to be connected between an input transmission line and an output transmission line comprising a cavity containing at least three parallel posts forming a tuned circuit the resonant frequency of which is dependent upon the power applied to the input transmission line, the tuned circuit being coupled to the input transmission line by means of a transformer having a step-up transformation ratio and to the output transmission line by coupling means, the parallel posts also forming the transformer and the coupling means.
Claim 2
Dependent Claim
87 words
A microwave-frequency power-limiting device arranged to be connected between an input transmission line and an output transmission line comprising a cavity containing at least three parallel posts forming a tuned circuit the resonant frequency of which is dependent upon the power applied to the input transmission line, the tuned circuit being coupled to the input transmission line by means of a transformer having a step-up transformation ratio and to the output transmission line by coupling means, the parallel posts also forming the transformer and the coupling means.
Claim 3
Dependent Claim
16 words
A device as claimed in claim 1 in which the tuned circuit includes a voltage-sensitive reactance.
Claim 4
Dependent Claim
27 words
A device as claimed in claim 2 in which the voltage-sensitive reactance is a variable-capacitance diode connected to one of the posts other than the outermost posts.
Claim 5
Dependent Claim
35 words
A device as claimed in claim 1 for use with a coaxial transmission line, in which the inner conductors of the input and output transmission lines are connected to separate ones of the outermost posts.
Claim 6
Dependent Claim
32 words
A device as claimed in claim 1 for use with a waveguide transmission line, in which all except the outermost posts are located within a portion of the waveguide of reduced dimensions.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |