Ultra-high-frequency notch filter having an inductance set by selecting a conductor width
First Claim
Patent Images
1. An apparatus comprising:
- a capacitor having a body and a pair of terminals attached to the body, wherein the body defines an outer surface of the apparatus; and
a conductor printed on the outer surface and connecting the terminals, the conductor having an inductance (L) defining with a capacitance (C) of the capacitor a parallel LC circuit.
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Abstract
An ultra-high-frequency notch filter (100) comprises a capacitor (102) defining a conductive trace (106) on its body (103) and extending between its terminals (104). The trace has an inductance that forms a parallel LC circuit with the capacitance of the capacitor. When mounted on a printed circuit board (120) to connect two segments of a signal line (124), the notch filter and a ground plane (122) of the PCB form a virtual conductive loop having an inductance and a capacitance whose product is the center frequency of the notch of the notch filter. The center frequency is tuned by varying the width of the trace.
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Citations
20 Claims
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1. An apparatus comprising:
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a capacitor having a body and a pair of terminals attached to the body, wherein the body defines an outer surface of the apparatus; and a conductor printed on the outer surface and connecting the terminals, the conductor having an inductance (L) defining with a capacitance (C) of the capacitor a parallel LC circuit. - View Dependent Claims (2, 3)
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4. An apparatus comprising:
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a capacitor having a body and a pair of terminals attached to the body; and a conductor defined on the body and connecting the terminals, the conductor having an inductance (L) defining with a capacitance (C) of the capacitor a notch filter wherein the capacitor has a self-resonant frequency greater than or equal to a notch center frequency of the notch filter.
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5. A notch filter having a notch center frequency, comprising:
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a capacitor having a body and a pair of terminals attached to the body, the capacitor having a self-resonant frequency equal to or greater than the notch center frequency; and a conductive trace extending along the body and connecting the terminals, the trace having an inductance. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A printed circuit board (PCB) comprising:
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a signal conductor comprising a pair of discrete conductor segments defined by the PCB; a ground plane defined by the PCB; a capacitor having a body and a pair of terminals on the body that connect the capacitor between the segments; a conductor defined on the body and connecting the pair of terminals and having an inductance, the conductor providing with the capacitor a notch filter for the signal conductor such that a product of capacitance and inductance of a virtual conductive loop provided by the notch filter and the ground plane equals a center frequency of a notch of the notch filter. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus comprising:
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a capacitor having a body and a pair of terminals attached to the body; and a conductor defined on the body and connecting the terminals, the conductor having an inductance (L) defining with a capacitance (C) of the capacitor a parallel LC circuit;
whereinthe conductor has a width defining the inductance such that the inductance is set by selecting the width of the conductor. - View Dependent Claims (18, 19, 20)
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Specification