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Patent US4707669A successfully refreshed from Google Patents.
US4707669A
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Dielectric resonator microwave oscillator having enhanced negative resistance
Assignee: Panasonic Holdings Corp
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Filing: 1986-05-20
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Granted: 1987-11-17
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Expires: 2006-05-20
Abstract
Abstract A dielectric resonator microwave oscillator in which the gate of a FET is connected to a resonance circuit. An inductor is connected to the drain of the FET, and the output is taken from the source of the FET. This dielectric resonator microwave oscillator has enhanced negative resistance and positively starts the oscillation even when there is a low reflection coefficient of the resonance circuit. Using a circuit which consists of a capacitor and inductor between the source and the output terminal, a further increasing of negative resistance at the gate of the FET is obtained.
Inventors
- 👤 Tsuyoshi Mekata
- 👤 Hiroshi Saka
- 👤 Toshihide Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1864; H03B5/187; H03B5/1876; H03B2200/00; H03B2200/0014; H03B2200/0028; H03B5/1841; H03B5/1847; H03B5/1852
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
109 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: an FET, having a gate, a drain and a source; a microwave resonator connected to said gate of said FET; an inductive element, one end of which is connected to said drain of said FET, and the other end of which is grounded with respect to microwave frequency; an output terminal; a series connection of a second inductive element and a first capacitive element connected between said source of said FET and said output terminal; and a second capacitive element, having one end connected to said output terminal and another end which is grounded with respect to microwave frequency.
Claim 2
Dependent Claim
109 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: an FET, having a gate, a drain and a source; a microwave resonator connected to said gate of said FET; an inductive element, one end of which is connected to said drain of said FET, and the other end of which is grounded with respect to microwave frequency; an output terminal; a series connection of a second inductive element and a first capacitive element connected between said source of said FET and said output terminal; and a second capacitive element, having one end connected to said output terminal and another end which is grounded with respect to microwave frequency.
Claim 3
Dependent Claim
109 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: an FET having a gate, source and drain; a microwave resonator connected to said gate of said FET; an inductive element connected by one end to said drain of said FET, and grounded at the other end thereof with respect to microwave frequency; an output terminal connected to said source of said FET; a series connection of a low resistance resistor and a 1/4 wavelength strip line connected with said resistor connected to the source; and a high resistance resistor, connected between said gate and the junction point between said low resistance resistor and said 1/4 wavelength strip line.
Claim 4
Dependent Claim
109 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: an FET having a gate, source and drain; a microwave resonator connected to said gate of said FET; an inductive element connected by one end to said drain of said FET, and grounded at the other end thereof with respect to microwave frequency; an output terminal connected to said source of said FET; a series connection of a low resistance resistor and a 1/4 wavelength strip line connected with said resistor connected to the source; and a high resistance resistor, connected between said gate and the junction point between said low resistance resistor and said 1/4 wavelength strip line.
Claim 5
Dependent Claim
68 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 2, wherein said microwave resonator comprises: a strip line connected to said gate of said FET; a dielectric resonator electromagnetically coupled to said strip line; and a dummy resistor which is connected to said strip line and is isolated from ground with respect to DC current, but is grounded with respect to microwave frequency current.
Claim 6
Dependent Claim
66 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 2, wherein: one end of said 1/4 wavelength strip line is bypassed by a bypass capacitive element and the other end of said 1/4 wavelength strip line is connected to the source through said low resistance resistor, and said other end of said inductive element is grounded by a second bypass capacitive element.
Claim 7
Dependent Claim
28 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 2, wherein: a DC blocking element is provided between the gate and said microwave resonator.
Claim 8
Dependent Claim
100 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: a FET having a drain, source and gate; a microwave resonator connected to said gate of said FET; a low resistance resistor connected by one end thereof to said source of said FET; a 1/4 wavelength strip line connected by one end thereof to the other end of said low resistance resistor, the other end of said 1/4 wavelength strip line being grounded with respect to microwave frequency; and a high resistance resistor connected between said gate and a junction point between said low resistance resistor and said strip line.
Claim 9
Dependent Claim
100 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: a FET having a drain, source and gate; a microwave resonator connected to said gate of said FET; a low resistance resistor connected by one end thereof to said source of said FET; a 1/4 wavelength strip line connected by one end thereof to the other end of said low resistance resistor, the other end of said 1/4 wavelength strip line being grounded with respect to microwave frequency; and a high resistance resistor connected between said gate and a junction point between said low resistance resistor and said strip line.
Claim 10
Dependent Claim
40 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 6, which further comprises: a capacitive element connected between the source of said FET and ground; and an output terminal connected to said drain of said FET.
Claim 11
Dependent Claim
112 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: a FET having a gate, source and drain; a reflex microwave resonator connected to said gate of said FET; a first inductive element connected to said gate of said FET; a second inductive element connected by one end to said drain of said FET, and grounded by the other end thereof with respect to microwave frequency, said second inductive element having an inductance with an absolute value of a reflection coefficient seen from the gate of said FET which is larger than 1 at a resonant frequency of said microwave resonator; and an output terminal connected to said source of said FET.
Claim 12
Dependent Claim
112 words
A dielectric resonator microwave oscillator having enhanced negative resistance comprising: a FET having a gate, source and drain; a reflex microwave resonator connected to said gate of said FET; a first inductive element connected to said gate of said FET; a second inductive element connected by one end to said drain of said FET, and grounded by the other end thereof with respect to microwave frequency, said second inductive element having an inductance with an absolute value of a reflection coefficient seen from the gate of said FET which is larger than 1 at a resonant frequency of said microwave resonator; and an output terminal connected to said source of said FET.
Claim 13
Dependent Claim
63 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 8, further comprising a first capacitive element connected between said output terminal and said source, said first capacitive element having a capacitance with an absolute value of a reflection coefficient seen from the gate of said FET that is larger than 1 at a resonant frequency of said microwave resonator.
Claim 14
Dependent Claim
62 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 9, wherein: a second capacitive element is connected between said output terminal and ground, and said second capacitive element has a capacitance where an absolute value of a reflection coefficient seen from the gate of said FET is larger than 1 at a resonant frequency of said microwave resonator.
Claim 15
Dependent Claim
60 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 8, further comprising a first capacitive element, connected between said source and ground, said first capacitive element having a capacitance where an absolute value of a reflection coefficient seen from the gate of said FET is larger than 1 at said resonance frequency of said microwave resonator.
Claim 16
Dependent Claim
63 words
A dielectric resonator microwave oscillator having enhanced negative resistance in accordance with claim 11, further comprising a second capacitive element, connected between said source and said output terminal, wherein said second capacitive element has a capacitance where an absolute value of a reflection coefficient seen from the gate of said FET is larger than 1 at a resonant frequency of said microwave resonator.
References Cited (Backward Citations)
US4435688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |