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US 8,576,027 B2Granted
Differential-common mode resonant filters
AssigneeNEC Corporation
InventorTaras Kushta
Life of this patent
Estimating the term…
Abstract
A filter is provided with a multilayer board incorporating a resonator formed by two ground plates opposed to each other and conductive side walls connected to the ground plates; two signal vias provided through the resonator; and two terminals connected to the signal vias to receive a pair of signals. The resonator has a first face of symmetry vertical to the ground plates. The signal vias are disposed symmetrically with respect to the first face of symmetry on a distance from the first face of symmetry.
Claims23
A differential-common mode resonant filter, comprising:
- a multilayer board comprising two or more conductor layers;
- a resonator formed by ground plates disposed one under another in said conductor layers and ground vias connected to said ground plates;
- two signal vias disposed within said resonator, passing through said resonator and isolated from said ground plates by clearance holes;
- two terminals connected to said two signal vias to receive differential-mode and common-mode signals;
- wherein said resonator establishes a resonant effect on said two signal vias at predetermined frequencies by means of horizontal dimensions of said resonator and a first isolating material disposed between said ground plates,
- wherein said resonator has a first face of symmetry perpendicular to said ground plates, and
- wherein said two signal vias are disposed symmetrically with respect to said first face of symmetry at a distance from said first face of symmetry providing a separation of said differential-mode and common-mode signals in a frequency domain.
4 more elements
A differential-common mode resonant filter comprising:
- a multilayer board comprising two or more conductor layers;
- a resonator formed by ground plates disposed one under another in said conductor layers and ground vias connected to said ground plates;
- two signal vias disposed within said resonator, passing through said resonator and isolated from said ground plates by clearance holes;
- two identical groups of tuning elements disposed within said resonator;
- two terminals connected to said two signal vias to receive differential-mode and common-mode signals;
- wherein said resonator establishes a resonant effect on said two signal vias at predetermined frequencies by means of horizontal dimensions of said resonator and a material disposed between said ground plates,
- wherein said resonator has a first face of symmetry perpendicular to said ground plates,
- wherein said two signal vias are disposed symmetrically with respect to said first face of symmetry at a distance from said first face of symmetry,
- wherein said resonator has a second face of symmetry perpendicular to said ground plates and passing through centers of said two signal vias,
- wherein each of said groups comprises one or more tuning elements,
- wherein said two groups of tuning elements are disposed symmetrically to each other with respect to said second face of symmetry, and
- wherein said one or more tuning elements are made as holes passing through said multilayer board.
9 more elements
A differential-common mode resonant filter comprising:
- a multilayer board comprising two or more conductor layers;
- a resonator formed by ground plates disposed one under another in said conductor layers and ground vias connected to said ground plates;
- two signal vias disposed within said resonator, passing through said resonator and isolated from said ground plates by clearance holes;
- two identical groups of tuning elements disposed within said resonator;
- two terminals connected to said two signal vias to receive differential-mode and common- mode signals;
- wherein said resonator establishes a resonant effect on said two signal vias at predetermined frequencies by means of horizontal dimensions of said resonator and a material disposed between said ground plates,
- wherein said resonator has a first face of symmetry perpendicular to said ground plates,
- wherein said two signal vias are disposed symmetrically with respect to said first face of symmetry at a distance from said first face of symmetry,
- wherein said resonator has a second face of symmetry perpendicular to said ground plates and passing through centers of said two signal vias,
- wherein each of said two groups comprises one or more tuning elements,
- wherein said two groups of tuning elements are symmetrical to each other with respect to said second face of symmetry, and
- wherein the number, positions, materials and dimensions of said tuning elements are chosen to provide reduction of the common mode.
9 more elements
A differential-common mode resonant filter comprising:
- a multilayer board comprising two or more conductor layers;
- a resonator formed by ground plates disposed one under another in said conductor layers and ground vias connected to said ground plates;
- two signal vias disposed within said resonator, passing through said resonator, and isolated from said ground plates by clearance holes;
- two identical groups of tuning elements disposed within said resonator;
- two terminals connected to said two signal vias to receive differential-mode and common-mode signals;
- wherein said resonator establishes a resonant effect on said two signal vias at predetermined frequencies by means of horizontal dimensions of said resonator and a material disposed between said ground plates,
- wherein said resonator has a first face of symmetry perpendicular to said ground plates,
- wherein said two signal vias are disposed symmetrically with respect to said first face of symmetry at a distance from said first face of symmetry,
- wherein said resonator has a second face of symmetry perpendicular to said ground plates and passing through centers of said two signal vias,
- wherein each of said two groups comprises one or more tuning elements,
- wherein said two groups of tuning elements are symmetrical to each other with respect to said second face of symmetry, and
- wherein the number, positions, materials and dimensions of said tuning elements are chosen to provide reduction of the common mode in a predetermined frequency band, keeping the level of the differential mode on a required level in said predetermined frequency band.
9 more elements
A method of suppressing the common mode, comprising:
- providing a resonator, formed by two horizontal conductor plates opposed to each other and separated by an isolating material, and vertical conductor walls connected to said horizontal conductor plates, having a first face of symmetry and a second face of symmetry;
- and
- providing a pair of signal conductors disposed through said resonator symmetrically with respect to said first face of symmetry and isolated from said horizontal conductor plates;
- and
- providing two identical groups of tuning elements disposed through said resonator symmetrically with respect to said second face of symmetry, said tuning elements being made of electromagnetic wave absorbing material.
2 more elements
A method of controlling the resonance frequency of a resonator used in differential-common mode filter, comprising:
- providing a resonator incorporating horizontal conductor plates opposed to each other and separated by an isolating material, and vertical conductor walls connected to said horizontal conductor plates, having a first face of symmetry and a second face of symmetry;
- providing a pair of signal conductors disposed through said resonator symmetrically with respect to said first face of symmetry and isolated from said horizontal conductor plates;
- and
- providing two identical groups of tuning elements disposed through said resonator symmetrically with respect to said second face of symmetry.
1 more element
Dependencies are inferred from the claim text.