US4348646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-delay-triggered TRAPATT oscillator with directional filter
Assignee: US Philips Corp
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Filing: 1980-05-19
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Granted: 1982-09-07
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Expires: 2000-05-19
Abstract
Abstract A time-delay-triggered TRAPATT oscillator comprising a length of delay line with a TRAPATT diode at one end and a matching filter at the other end, and a constant resistance directional filter at the output end of the matching filter.
Inventors
- 👤 Barrie H. Newton
- 👤 Peter L. Booth
- 👤 Robert Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:27
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/147
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
84 words
A time-delay-triggered TRAPATT oscillator circuit for operating at a predetermined frequency, comprising: a delay line; a TRAPATT diode connected to one end of the delay line; a matching filter having one end connected to the delay line at a predetermined distance from the diode, said filter comprising successive sections of transmission line of different impedances; a directional filter connected to an end of the matching filter remote from the delay line; and means for extracting energy from the directional filter at the predetermined frequency.
Claim 2
Dependent Claim
84 words
A time-delay-triggered TRAPATT oscillator circuit for operating at a predetermined frequency, comprising: a delay line; a TRAPATT diode connected to one end of the delay line; a matching filter having one end connected to the delay line at a predetermined distance from the diode, said filter comprising successive sections of transmission line of different impedances; a directional filter connected to an end of the matching filter remote from the delay line; and means for extracting energy from the directional filter at the predetermined frequency.
Claim 3
Dependent Claim
16 words
An oscillator circuit as in claim 1 wherein said directional filter is a travelling-wave loop filter.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |