Oscillator module incorporating spiral looped-stub resonator
First Claim
1. A resonator device configured with an input port at one end and a termination at its other end, and for providing a frequency selective element for an oscillator, the device comprising:
- a substrate having a thickness between its two outer planar surfaces; and
a fractional wavelength transmission line on one of the surfaces of the substrate, and formed into more than one loop thereby providing a spiral shaped looped-stub resonator structure, wherein adjacent conductor runs of the more than one loop are a predetermined distance from one another to isolate electrical fields between runs, the predetermined distance equal to or greater than the thickness of the substrate.
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Accused Products
Abstract
A transmission line configured as a looped-stub resonator is disclosed, which can be used as a frequency selective element for an oscillator, such as a VCO of a phase locked loop. The transmission line is a fraction of an electrical wavelength, and can be embedded to provide an inner resonant layer of an overall layered structure. The transmission line is formed into a loop or multiple loops and may be terminated with a capacitor, short circuit, or open circuit. In the embedded case, dielectric insulating material can be used to surround the transmission line on top and bottom surfaces as layers. In addition, electrically conducting material layers can be used to surround the dielectric insulating material.
32 Citations
23 Claims
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1. A resonator device configured with an input port at one end and a termination at its other end, and for providing a frequency selective element for an oscillator, the device comprising:
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a substrate having a thickness between its two outer planar surfaces; and
a fractional wavelength transmission line on one of the surfaces of the substrate, and formed into more than one loop thereby providing a spiral shaped looped-stub resonator structure, wherein adjacent conductor runs of the more than one loop are a predetermined distance from one another to isolate electrical fields between runs, the predetermined distance equal to or greater than the thickness of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A phase locked loop module comprising:
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a voltage controlled oscillator circuit; and
a fractional wavelength looped-stub resonator located on a substrate having a thickness and operatively coupled to the voltage controlled oscillator circuit and having more than one loop thereby providing a spiral shaped loop, the resonator for providing a frequency selective element for the voltage controlled oscillator circuit;
wherein adjacent conductor runs of the more than one loop are a predetermined distance from one another to isolate electrical fields between runs, the predetermined distance equal to or greater than the thickness of the substrate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A phase locked loop module comprising:
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a first layer having a voltage controlled oscillator circuit;
a second layer of dielectric insulating material covered with a conducting metal that is connected to a ground plane;
a third layer having a fractional wavelength looped-stub resonator operatively coupled to the voltage controlled oscillator circuit and having one or more loops, with each edge or side of the one or more loops providing a portion of the fractional wavelength, the resonator for providing a frequency selective element for the voltage controlled oscillator circuit; and
a fourth layer of dielectric insulating material covered with a conducting metal that is connected to the ground plane;
wherein the third layer is surrounded by the dielectric insulating material of the second and fourth layers. - View Dependent Claims (21, 22, 23)
an additional layer of dielectric insulating material on the conducting metal of the second layer to prevent unintended short-circuiting between the first layer and the second layer.
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22. The module of claim 20 wherein the looped-stub resonator has a resonant frequency higher than an output frequency of the module.
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23. The module of claim 22 wherein one or more frequency dividers are used to reduce the resonant frequency to the output frequency.
Specification