Low-cost, low-noise, temperature-stable, tunable dielectric resonator oscillator
First Claim
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1. A resonant structure comprising:
- a resonant cavity having a substantially cylindrical side wall, a flat top wall, and a flat base;
a post having a first and second end, said first end of said post mounted to said flat base in said cavity;
a dielectric disk, resonant at a center frequency, mounted to said second end of said post, said disk mounted coaxially with said cylindrical side wall and substantially midway between said base and said top wall;
an insulating substrate mounted over said flat base;
an input microstrip for coupling energy into said cavity; and
an output microstrip for removing energy at said center frequency from said cavity;
wherein said cylindrical side wall has a diameter that is at least three times greater than the diameter of said disk.
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Abstract
A dielectric resonator oscillator having a resonant structure connected to an amplifier the output of which is fed back to the input of the resonant structure. The resonant structure includes a metal cavity in which a dielectric disk is centrally mounted by a low-loss dielectric post. A pair of microstrip transmission lines extend into the cavity to provide energy outputs and inputs. Dielectric and conductive tuning screws are mounted on the cavity walls. Electrical tuning is provided via a varactor diode whose bias is adjustable. The diode may be connected in series or parallel with the microstrip transmission line.
40 Citations
21 Claims
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1. A resonant structure comprising:
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a resonant cavity having a substantially cylindrical side wall, a flat top wall, and a flat base; a post having a first and second end, said first end of said post mounted to said flat base in said cavity; a dielectric disk, resonant at a center frequency, mounted to said second end of said post, said disk mounted coaxially with said cylindrical side wall and substantially midway between said base and said top wall; an insulating substrate mounted over said flat base; an input microstrip for coupling energy into said cavity; and an output microstrip for removing energy at said center frequency from said cavity; wherein said cylindrical side wall has a diameter that is at least three times greater than the diameter of said disk. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A dielectric resonator oscillator comprising:
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a resonant cavity being substantially cylindrical in shape having a top wall and a base; a post mounted in said cavity; a resonant dielectric disk supported by said post such that said disk is located coaxially with said cavity and substantially midway between said base and said top wall; an input microstrip extending into said cavity; an output microstrip extending into said cavity;
wherein said cylindrical resonant cavity has a diameter that is at least three times the diameter of said resonant dielectric disk; andan amplifier having an input connected to said output microstrip and an output connected to said input microstrip. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification