High quality factor (Q) planar spiral inductor based CATV diplexer and telephony module
First Claim
1. A radio frequency input/output module, comprising:
- a first printed circuit board substrate; and
filter circuitry disposed on the first substrate and configured to receive at least one radio frequency input signal and transmit at least one radio frequency output signal, the filter circuitry including at least one high quality factor value inductor, wherein the high quality factor value inductor comprises a planar circular spiral inductor fabricatable using a standard printed circuit board fabrication process.
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Accused Products
Abstract
A cable television diplexer and telephony module that can be employed in CATV data transmission systems to enhance performance levels and reduce manufacturing costs. The cable television diplexer and telephony module includes a printed circuit board substrate, and a diplexer having a low pass filter section and a high pass filter section, each of which has components mounted on the substrate. The respective low pass and high pass filter sections of the diplexer include one or more high Q value planar spiral inductors. Each spiral inductor includes a narrow track of metal disposed on the substrate and wound around a center to form a circular spiral curve having a plurality of turns. The spiral inductor may be fabricated on the substrate of the cable television diplexer and telephony module, or on a separate substrate, using a standard PCB fabrication process.
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Citations
15 Claims
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1. A radio frequency input/output module, comprising:
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a first printed circuit board substrate; and
filter circuitry disposed on the first substrate and configured to receive at least one radio frequency input signal and transmit at least one radio frequency output signal, the filter circuitry including at least one high quality factor value inductor, wherein the high quality factor value inductor comprises a planar circular spiral inductor fabricatable using a standard printed circuit board fabrication process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A high quality factor value inductor, the inductor being monolithically implementable on a printed circuit board substrate, comprising:
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at least one narrow track of metal disposed on at least one side of the substrate, wherein the narrow track of metal is wound around a center to form a circular spiral curve having a plurality of turns, thereby reducing stray capacitance between the inductor and the substrate. - View Dependent Claims (10, 11, 12)
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13. A method of fabricating a radio frequency input/output module including one or more spiral inductors, comprising the steps of:
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fabricating a first printed circuit board substrate according to a predetermined layout of the radio frequency input/output module; and
during the fabrication of the first substrate, implementing at least one first spiral inductor on the first substrate, the first spiral inductor comprising at least one narrow track of metal disposed on at least one side of the first substrate, the narrow track of metal being wound around a center to form a circular spiral curve having a plurality of turns, thereby reducing stray capacitance between the inductor and the first substrate. - View Dependent Claims (14, 15)
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Specification