Voltage controlled oscillator including a dielectric resonator provided with a C-shaped electrode and method of regulating oscillation frequency thereof
First Claim
1. A voltage controlled oscillator comprising:
- a circuit board having a major surface;
a dielectric resonator on said major surface of said circuit board; and
a metal case mounted on said circuit board so as to shield said dielectric resonator,said dielectric resonator comprising;
a dielectric body having an upper surface, a lower surface and a side surface,a C-shaped first electrode provided in the interior of said dielectric body having a first portion which forms an inductance and a second portion which forms a capacitance,wherein said first portion of said C-shaped first electrode comprises a conductor having two opposite ends, and said second portion of said C-shaped first electrode comprises a gap defined between said two opposite ends,a planar second electrode arranged opposite an upper side of said first electrode and opposed to said first electrode through a part of said dielectric body,a planar third electrode arranged opposite a lower side of said first electrode and opposed to said first electrode through another part of said dielectric body,a signal extracting pattern extending from said first electrode to said side surface of said dielectric body, andfirst, second and third earth extracting patterns extending from said first, second and third electrodes, respectively, to reach said side surface of said dielectric body.
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Accused Products
Abstract
In a voltage controlled oscillator, a dielectric resonator is mounted on a circuit board and a metal case is mounted on the circuit board to shield the dielectric resonator. The dielectric resonator comprises a C-shaped first electrode which is provided in a dielectric body, second and third electrodes which are arranged on upper and lower sides of the first electrode, a signal connecting pattern which is extended from the first electrode toward a side surface of the dielectric body, and earth connecting patterns which are extended from the first, second and third electrodes toward the side surface of the dielectric body, to provide predetermined impedance between the earth connecting pattern and the signal connecting pattern. The dielectric resonator is arranged with the second and third electrodes in parallel with a major surface of the circuit board, and the second electrode is upwardly exposed. A portion of the second electrode portion at a predetermined position is adapted to be trimmed so as to regulate the resonance frequency of the dielectric resonator, so as to regulate the oscillator frequency of the voltage controlled oscillator. The dielectric resonator can be miniaturized with no reduction of its Q-value.
15 Citations
23 Claims
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1. A voltage controlled oscillator comprising:
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a circuit board having a major surface; a dielectric resonator on said major surface of said circuit board; and a metal case mounted on said circuit board so as to shield said dielectric resonator, said dielectric resonator comprising; a dielectric body having an upper surface, a lower surface and a side surface, a C-shaped first electrode provided in the interior of said dielectric body having a first portion which forms an inductance and a second portion which forms a capacitance, wherein said first portion of said C-shaped first electrode comprises a conductor having two opposite ends, and said second portion of said C-shaped first electrode comprises a gap defined between said two opposite ends, a planar second electrode arranged opposite an upper side of said first electrode and opposed to said first electrode through a part of said dielectric body, a planar third electrode arranged opposite a lower side of said first electrode and opposed to said first electrode through another part of said dielectric body, a signal extracting pattern extending from said first electrode to said side surface of said dielectric body, and first, second and third earth extracting patterns extending from said first, second and third electrodes, respectively, to reach said side surface of said dielectric body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification