Electronically tuned dielectric resonator stabilized oscillator

• US 4,871,983 A
• Filed: 07/06/1988
• Issued: 10/03/1989
• Est. Priority Date: 07/06/1988
• Status: Expired due to Fees

• Current Assignee: Litton Systems Incorporated
• Original Assignee: Litton Systems Incorporated
• Inventors: Graycar, Joseph M.
• Primary Examiner(s): MIS, DAVID C
• Application Number:
  US07/220,655
• Time in Patent Office: 454 Days
• Field of Search: 331/36 C, 331/96, 331/99, 331/100, 331/107 DP, 331/107 SL, 331/117 D, 331/177 V, 333/235, 333/247
• US Class Current: 331/96
• CPC Class Codes: H01P 7/10 Dielectric resonators
• CPC Class Codes: H03B 2200/0024 including parallel striplines
• CPC Class Codes: H03B 2200/004 including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
• CPC Class Codes: H03B 2201/0208 the means being an element with a variable capacitance, e.g. capacitance diode
• CPC Class Codes: H03B 5/1852 the semiconductor device being a field-effect device
• CPC Class Codes: H03B 5/1876 the semiconductor device being a field-effect device

Abstract

An electronically tuned dielectric resonator stabilized oscillator has a dielectric resonator that is fine tuned by an electronic method of tuning which includes a varactor coupled to a microstrip. This varactor microstrip transmission line is positioned below the dielectric resonator but above the plane in which a transmission line for the carrier frequency resides. By not placing the fine tuning microstrip line on the same plane as the main oscillator line, spurious oscillation between the fine tuning transmission line and the primary carrier wave resonator frequency line are minimized. Additionally, the fine tuning microstrip line is positioned orthogonal to the pathways along which the main signal transmission lines are coupled.

Claims

1. A dielectric resonator stabilized oscillator, comprising:

resonator means for selecting a particular band frequency;

a first transmission line substantially disposed in a first plane, said first transmission line capable of carrying a high frequency input signal and coupled to said resonator;

a second transmission line substantially disposed in a second plane and spaced apart from said first plane, said second transmission line spaced apart from and coupled to said resonator means; and

,

electronic means for fine tuning said resonator, said electronic means for fine tuning coupled to said second transmission line.

2. The device of claim 1 wherein:

said first and second transmission lines are spaced apart by a distance sufficient to minimize spurious coupling between said electronic fine tuning means and said first transmission line.

3. The device of claim 2 wherein said first and second transmission lines are positioned orthogonal to one another.

4. The device of claim 1, wherein said first transmission line is split into at least two segments,

a first segment connected to a microwave frequency generator first terminal;

and, a second segment connected to a microwave frequency generator second terminal;

said first and second segments connected to an active oscillation means;

whereby, a feedback signal drives said high frequency input for coupling to said resonator means.

5. A dielectric resonator stabilized oscillator, comprising:

resonator means for selecting a particular band frequency;

a first transmission line substantially disposed in a first plane, said first transmission line capable of carrying a high frequency input signal and coupled to said resonator;

a second transmission line substantially disposed in a second plane and spaced apart from said first plane, said second transmission line spaced apart from and coupled to said resonator means;

means for fine tuning said second transmission line; and

said means for fine tuning said resonator being a varactor diode connected to said second transmission line.

6. A dielectric resonator stabilized oscillator, comprising:

resonator means lying in a coupling plane for selecting a particular band frequency;

an oscillator microstrip line capable of carrying a high-frequency input signal selectable by said resonator means, said resonator means coupled along said coupling plane to said microstrip line;

means for electronically fine tuning said resonator means;

said fine tuning means coupled to a tuning microstrip line, said tuning microstrip line being positioned in a second plane spaced apart from said resonator means and parallel to said coupling plane;

between said resonator means and said oscillator microstrip line;

whereby, said resonator means may be fine tuned independent from any resonant coupling between said oscillator microstrip line and said resonator without the introduction of noise or spurious oscillations.

7. The dielectric stabilized oscillator of claim 6, wherein:

said tuning microstrip line is substantially orthogonal to said oscillator microstrip line.

8. A dielectric resonator stabilized oscillator, comprising:

resonator means lying in a coupling plane for selecting a particular band frequency;

an oscillator microstrip line capable of carrying a high-frequency input signal selectable by said resonator means, said resonator means coupled along said coupling plane to said microstrip line;

means for electronically fine tuning said resonator means;

said fine tuning means coupled to a tuning microstrip line, said tuning microstrip line being positioned in a second plane spaced apart from said resonator means and parallel to said coupling plane;

the resonator means being a cylindrical dielectric resonator mounted on a fused silica spacer;

said fused silica spacer being mounted on a metallized substrate layer, said substrate layer lying in said coupling plane;

said oscillator microstrip line being etched onto said substrate and said tuning microstrip line is etched onto said spacer;

whereby, said resonator means and said oscillator microstrip line may be calibrated independent of said fine tuning means; and

said resonator means may be fine tuned independent from any resonant coupling between said oscillator microstrip line and said resonator without the introduction of noise or spurious oscillations.

9. The dielectric resonator stabilized oscillator of claim 8, wherein:

said fine tuning means is a varactor diode.

10. A method of manufacturing a dielectric resonator stabilized oscillator, comprising the steps of:

etching at least one oscillator microstrip line onto a first surface of a substrate semiconductor layer;

mounting a fused silica spacer onto said first surface of said substrate layer;

etching a tuning microstrip line onto said fused silica spacer;

mounting a resonator means on said fused silica spacer, placing said resonator means at a spaced apart distance from said oscillator and tuning microstrip lines;

whereby, the resonator means may be coupled to said oscillator microstrip line independent of said tuning microstrip line.

11. The method of manufacture of claim 10, wherein:

said tuning microstrip line is etched onto said fused silica spacer orthogonal to said oscillator microstrip line.