Patent US4713632A successfully refreshed from Google Patents.
US4713632A
Expired / Lapsed
US
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Band reflection type FET dielectric resonator oscillator
Assignee: Murata Manufacturing Co Ltd
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Filing: 1986-05-16
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Granted: 1987-12-15
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Expires: 2006-05-16
Abstract
Abstract A band reflection type oscillator includes a GaAs-FET having a source, a gate and a drain in which the drain is connected to ground. A stripline is connected to the gate, and a dielectric resonator is provided adjacent the stripline in a magnetically coupled relationship therewith. A stripline stub is electrically connected to the drain and positioned adjacent the resonator in a magnetically coupled relationship therewith, thereby defining a positive feedback circuit through the drain, said stripline stub, the resonator and the stripline to the gate. By the positive feedback circuit, the oscillation stability is improved.
Inventors
- 👤 Toshio Nishikawa
- 👤 Sadahiro Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:17
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1864; H03B5/187; H03B5/1876; H03B2200/00; H03B2200/0014; H03B2200/0024; H03B5/1841; H03B5/1847; H03B5/1852
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A band reflection type oscillator comprising: an FET having a source, a gate and a drain; a stripline connected to said gate; a resonator provided adjacent said stripline in a magnetically coupled relationship therewith; and a first stripline stub having a length equal to (n/2+1/4) wavelength, wherein n is zero or a positive integer, said stub position adjacent said resonator in a magnetically coupled relationship therewith and having a first end which is connected to said drain and a second end which is open ended, thereby substantially grounding said drain in terms of high frequency and, at the same time, forming a positive feedback circuit between said drain and said gate through said resonator.
Claim 2
Dependent Claim
114 words
A band reflection type oscillator comprising: an FET having a source, a gate and a drain; a stripline connected to said gate; a resonator provided adjacent said stripline in a magnetically coupled relationship therewith; and a first stripline stub having a length equal to (n/2+1/4) wavelength, wherein n is zero or a positive integer, said stub position adjacent said resonator in a magnetically coupled relationship therewith and having a first end which is connected to said drain and a second end which is open ended, thereby substantially grounding said drain in terms of high frequency and, at the same time, forming a positive feedback circuit between said drain and said gate through said resonator.
Claim 3
Dependent Claim
25 words
A band reflection type oscillator as claimed in claim 1, further comprising a high impedance stripline inserted between said drain and said first stripline stub.
Claim 4
Dependent Claim
29 words
A band reflection type oscillator as claimed in claim 2, further comprising a second stripline stub connected to one end of said high impedance stripline close to said drain.
Claim 5
Dependent Claim
22 words
A band reflection type oscillator as claimed in claim 1, wherein said FET is operating as a reverse channel type of FET.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |