US4435688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
FET Microwave oscillator being frequency stabilized by capacitive reactance micro-strip stub line
Assignee: Hitachi Ltd
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Filing: 1981-07-24
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Granted: 1984-03-06
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Expires: 2001-07-24
Abstract
Abstract A microwave oscillator circuit with an FET, a dielectric resonator and a micro-strip line has a capacitive reactance element connected between the source terminal of the FET and ground or between the source and drain terminals of the FET, so that the oscillation frequency fluctuations due to the power supply voltage fluctuations or the ambient temperature variations can be suppressed.
Inventors
- 👤 Keiro Shinkawa
- 👤 Masaki Noda
- 👤 Chuichi Sodeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:39
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1864; H03B5/187; H03B5/1876; H03B5/02; H03B5/04; H03B5/1841; H03B5/1847; H03B5/1852
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith and; a capacitive stub disposed adjacent to said FET and formed by a micro-strip line of which one end is connected to the source terminal of said FET and the other end is opened, said capacitive stub being a source terminal ground at microwave frequencies.
Claim 2
Dependent Claim
126 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith and; a capacitive stub disposed adjacent to said FET and formed by a micro-strip line of which one end is connected to the source terminal of said FET and the other end is opened, said capacitive stub being a source terminal ground at microwave frequencies.
Claim 3
Dependent Claim
18 words
A microwave oscillator according to claim 1 wherein said capacitive stub is coupled to said micro-strip output line.
Claim 4
Dependent Claim
104 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith; and a capacitive reactance disposed adjacent to said FET and being coupled to said source terminal and another part in said microwave oscillator.
Claim 5
Dependent Claim
104 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith; and a capacitive reactance disposed adjacent to said FET and being coupled to said source terminal and another part in said microwave oscillator.
Claim 6
Dependent Claim
14 words
A microwave oscillator according to claim 3 wherein said capacitive reactance comprises a capacitor.
Claim 7
Dependent Claim
33 words
A microwave oscillator according to claim 4 wherein the capacitor has one end connected to the source terminal of said FET and the other end connected to the drain terminal of said FET.
Claim 8
Dependent Claim
26 words
A microwave oscillator according to claim 4 wherein the capacitor has one end connected to the source terminal of said FET and the other end grounded.
Claim 9
Dependent Claim
29 words
A microwave oscillator according to claim 3 wherein said capacitive reactance comprises a diode having its cathode connected to the source terminal of said FET and its anode grounded.
Claim 10
Dependent Claim
18 words
A microwave oscillator according to claim 3 wherein said capacitive reactance is coupled to said micro-strip output line.
Claim 11
Dependent Claim
14 words
A microwave oscillator according to claim 3 wherein said capacitive reactance comprises a capacitor.
Claim 12
Dependent Claim
33 words
A microwave oscillator according to claim 9 wherein the capacitor has one end connected to the source terminal of said FET and the other end connected to the drain terminal of said FET.
Claim 13
Dependent Claim
26 words
A microwave oscillator according to claim 9 wherein the capacitor has one end connected to the source terminal of said FET and the other end grounded.
Claim 14
Dependent Claim
29 words
A microwave oscillator according to claim 3 wherein said capacitive reactance comprises a diode having its cathode connected to the source terminal of said FET and its anode grounded.
Claim 15
Dependent Claim
18 words
A microwave oscillator according to claim 3 wherein said capacitive reactance is coupled to said micro-strip output line.
Claim 16
Dependent Claim
106 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith; and a capacitive stub disposed adjacent to said FET and being coupled to said source terminal and being a source terminal ground at microwave frequencies.
Claim 17
Dependent Claim
106 words
A microwave oscillator comprising: a FET having source, drain and gate terminals; a micro-strip line connected to said drain terminal, said micro-strip line being grounded at microwave frequencies; an output line made of a micro-strip line, said output line being connected to the source terminal of said FET; a gate line made of a micro-strip line, said gate line being connected to the gate terminal of said FET; a dielectric resonator disposed adjacent to said gate line and electrically coupled therewith; and a capacitive stub disposed adjacent to said FET and being coupled to said source terminal and being a source terminal ground at microwave frequencies.
Claim 18
Dependent Claim
17 words
A microwave oscillator according to claim 14 wherein said capacitive stub is coupled to said output line.
References Cited (Backward Citations)
US4149127A
Cited
US4187476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |