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US6828881B2
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Stacked dielectric filter
Assignee: NGK Insulators Ltd
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Filing: 2002-06-27
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Granted: 2004-12-07
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Expires: 2022-06-27
Abstract
Abstract A stacked dielectric filter includes a filter section which has first and second input side resonant electrodes and first and second output side resonant electrodes of two ¼ wavelength resonators, a converting section which has a plurality of strip lines, and a connecting section which connects the filter section and the converting section, wherein the filter section, the converting section, and the connecting section are formed in a dielectric substrate. The filter section is formed at an upper portion in the stacking direction of dielectric layers. The converting section is formed at a lower portion in the stacking direction. The connecting section is formed between the filter section and the converting section.
Inventors
- 👤 Yasuhiko Mizutani
- 👤 Takami Hirai
- 👤 Kazuhiro Kadota
- 👤 Takanobu Saka
- 👤 Hironobu Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:09
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20354; H01P1/20381
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
71 words
A stacked dielectric filter comprising a filter section having a plurality of resonators for filtering an unbalanced signal, and at least one unbalanced-balanced converting section having strip lines, said filter section and said unbalanced-balanced converting section being in a dielectric substrate including a plurality of stacked dielectric layers, wherein said unbalanced-balanced converting section is connected via a connecting section to an input side and/or an output side of said filter section.
Claim 2
Dependent Claim
71 words
A stacked dielectric filter comprising a filter section having a plurality of resonators for filtering an unbalanced signal, and at least one unbalanced-balanced converting section having strip lines, said filter section and said unbalanced-balanced converting section being in a dielectric substrate including a plurality of stacked dielectric layers, wherein said unbalanced-balanced converting section is connected via a connecting section to an input side and/or an output side of said filter section.
Claim 3
Dependent Claim
24 words
The stacked dielectric filter according to claim 1 , wherein said dielectric substrate includes said plurality of stacked dielectric layers made of different materials.
Claim 4
Dependent Claim
38 words
The stacked dielectric filter according to claim 2 , wherein a dielectric constant of said dielectric layer corresponding to said filter section is higher than a dielectric constant of said dielectric layer corresponding to said unbalanced-balanced converting section.
Claim 5
Dependent Claim
56 words
The stacked dielectric filter according to claim 1 , wherein said filter section is formed at an upper portion or a lower portion in a stacking direction of said plurality of dielectric layers of said dielectric substrate, and said unbalanced-balanced converting section is formed at a portion other than said upper portion and said lower portion.
Claim 6
Dependent Claim
49 words
The stacked dielectric filter according to claim 4 , wherein ground electrodes are formed on both principal surfaces of said dielectric substrate; and planes on which resonant electrodes of said plurality of resonators are formed and planes on which said ground electrodes are formed are parallel to one another.
Claim 7
Dependent Claim
40 words
The stacked dielectric filter according to claim 5 , wherein planes on which input/output terminals of said filter section are formed and planes on which said strip lines of said unbalanced-balanced converting section are formed are perpendicular to one another.
Claim 8
Dependent Claim
49 words
The stacked dielectric filter according to claim 4 , wherein ground electrodes are formed on both principal surfaces of said dielectric substrate; and planes on which resonant electrodes of said plurality of resonators are formed and planes on which said ground electrodes are formed are perpendicular to one another.
Claim 9
Dependent Claim
40 words
The stacked dielectric filter according to claim 4 , wherein planes on which input/output terminals of said filter section are formed and planes on which said strip lines of said unbalanced-balanced converting section are formed are parallel to one another.
Claim 10
Dependent Claim
56 words
The stacked dielectric filter according to claim 1 , wherein said filter section is formed at a left portion or a right portion in a stacking direction of said plurality of dielectric layers of said dielectric substrate, and said unbalanced-balanced converting section is formed at a portion other than said left portion and said right portion.
Claim 11
Dependent Claim
49 words
The stacked dielectric filter according to claim 9 , wherein ground electrodes are formed on both principal surfaces of said dielectric substrate; and planes on which resonant electrodes of said plurality of resonators are formed and planes on which said ground electrodes are formed are parallel to one another.
Claim 12
Dependent Claim
40 words
The stacked dielectric filter according to claim 10 , wherein planes on which input/output terminals of said filter section are formed and planes on which said strip lines of said unbalanced-balanced converting section are formed are perpendicular to one another.
Claim 13
Dependent Claim
68 words
The stacked dielectric filter according to claim 1 , further comprising: an inner layer ground electrode which is provided in said dielectric substrate and which is connected to a ground electrode, wherein said connecting section is formed separately from said unbalanced-balanced converting section with said inner layer ground electrode interposed therebetween, and said connecting section is electrically connected to an unbalanced input/output section of said unbalanced-balanced converting section.
Claim 14
Dependent Claim
24 words
The stacked dielectric filter according to claim 12 , wherein said inner layer ground electrode isolates said filter section from said unbalanced-balanced converting section.
Claim 15
Dependent Claim
27 words
The stacked dielectric filter according to claim 1 , wherein said connecting section has a connecting electrode which is connected to said filter section via a capacitor.
Claim 16
Dependent Claim
132 words
The stacked dielectric filter according to claim 1 , wherein said unbalanced-balanced converting section comprises: a first strip line which is formed on a first principal surface of said dielectric layer and which has a first end of an unbalanced input/output section; a second strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to one balanced input/output terminal, and which is connected to a ground electrode at an arbitrary position on said second strip line; and a third strip line which is formed on said first principal surface of said dielectric layer, which has a first end connected to the other balanced input/output terminal, and which is connected to said ground electrode at an arbitrary position on said third strip line.
Claim 17
Dependent Claim
51 words
The stacked dielectric filter according to claim 15 , further comprising: an inner layer ground electrode which is provided in said dielectric substrate and which is connected to said ground electrode, wherein second ends of said second and third strip lines are connected to said inner layer ground electrode through via-holes.
Claim 18
Dependent Claim
59 words
The stacked dielectric filter according to claim 15 , wherein said second and third strip lines are arranged in linear symmetry about a line by which a line segment for connecting said plurality of balanced input/output terminals is equally divided into two, and respective physical lengths of said second and third strip lines are substantially identical with each other.
Claim 19
Dependent Claim
126 words
The stacked dielectric filter according to claim 15 , wherein a width of a first portion of said first strip line corresponding to said second strip line, a length of said first portion, a width of a second portion of said first strip line corresponding to said third strip line, a length of said second portion, a width of said second strip line, an electrically effective length of said second strip line, a width of said third strip line, an electrically effective length of said third strip line, and a dielectric coolant of said dielectric layer disposed between said first strip line and said second and third strip lines are determined corresponding to an output impedance, level balance, and phase balance of said unbalanced-balanced converting section.
Claim 20
Dependent Claim
24 words
The stacked dielectric filter according to claim 18 , wherein an input impedance of said unbalanced-balanced converting section has a value other than 50Ω.
Claim 21
Dependent Claim
156 words
The stacked dielectric filter according to claim 1 , further comprising: a DC electrode which is formed on a surface of said dielectric substrate and which is connected to a DC power source, wherein said unbalanced-balanced converting section comprises: a first strip line which is formed on a first principal surface of said dielectric layer and which has a first end of an unbalanced input/output section; a second strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to one balanced input/output terminal, and which is connected to said DC electrode at an arbitrary position on said second strip line; and a third strip line which is formed on said first principal surface of said dielectric layer, which has a first end connected to the other balanced input/output terminal, and which is connected to said DC electrode at an arbitrary position on said third strip line.
Claim 22
Dependent Claim
64 words
The stacked dielectric filter according to claim 20 , further comprising: an inner layer ground electrode which is provided in said dielectric substrate and which is connected to a ground electrode, wherein said second and third strip lines are connected to said DC electrode at respective arbitrary positions on said second and third strip lines through via-holes respectively beyond said inner layer ground electrode.
Claim 23
Dependent Claim
61 words
The stacked dielectric filter according to claim 21 , further comprising: an inner layer DC electrode which is provided in said dielectric substrate and which is connected to said DC electrode, wherein said second and third strip lines are connected to said inner layer DC electrode at respective arbitrary positions on said second and third strip fines through said via-holes respectively.
Claim 24
Dependent Claim
62 words
The stacked dielectric filter according to claim 20 , wherein said second and third strip lines are arranged in linear symmetry about a center of a line by which a line segment for connecting said plurality of balanced input/output terminals is equally divided into two, and respective physical lengths of said second and third strip lines are substantially identical with each other.
Claim 25
Dependent Claim
126 words
The stacked dielectric filter according to claim 20 , wherein a width of a first portion of said first strip line corresponding to said second strip line, a length of said first portion, a width of a second portion of said first strip line corresponding to said third strip line, a length of said second portion, a width of said second strip line, an electrically effective length of said second strip line, a width of said third strip line, an electrically effective length of said third strip line, and a dielectric constant of said dielectric layer disposed between said first strip line and said second and third strip lines are determined corresponding to an output impedance, level balance, and phase balance of said unbalanced-balanced converting section.
Claim 26
Dependent Claim
24 words
The stacked dielectric filter according to claim 24 , wherein an input impedance of said unbalanced-balanced converting section has a value other than 50Ω.
Claim 27
Dependent Claim
164 words
The stacked dielectric filter according to claim 1 , wherein said unbalanced-balanced converting section comprises: a first strip line which is formed on a first principal surface of said dielectric layer and which has a first end of an unbalanced input/output section; a second strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to one balanced input/output terminal, and which is connected to a ground electrode at an arbitrary position on said second strip line; a third strip line which is formed on a first principal surface of said dielectric layer and which has a first end connected to a second end of said first strip line; and a fourth strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to the other balanced input/output terminal, and which is connected to said ground electrode at an arbitrary position on said fourth strip line.
Claim 28
Dependent Claim
74 words
The stacked dielectric filter according to claim 26 , further comprising: an inner layer ground electrode connected to said ground electrode, said inner layer ground electrode being formed between said dielectric layer on which said second strip line is formed and said dielectric layer on which said third strip line is formed, wherein said second strip line is connected to said inner layer ground electrode at an arbitrary position on said second strip line.
Claim 29
Dependent Claim
117 words
The stacked dielectric filter according to claim 26 , wherein a width of said first strip line, a length of said first strip line, a width of said second strip line, an electrically effective length of said second strip line, a width of said third strip line, a length of said third strip line, a width of said fourth strip line, an electrically effective length of said fourth strip line, and a dielectric constant or dielectric constants of one or more of said dielectric layers disposed in a region ranging from said first strip line to said fourth strip line are determined corresponding to an output impedance, level balance, and phase balance of said unbalanced-balanced converting section.
Claim 30
Dependent Claim
24 words
The stacked dielectric filter according to claim 28 , wherein an input impedance of said unbalanced-balanced converting section has a value other than 50Ω.
Claim 31
Dependent Claim
188 words
The stacked dielectric filter according to claim 1 , further comprising: a DC electrode which is formed on a surface of said dielectric substrate and which is connected to a DC power source, wherein said unbalanced-balanced converting section comprises: a first strip line which is formed on a first principal surface of said dielectric layer and which has a first end of an unbalanced input/output section; a second strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to one balanced input/output terminal, and which is connected to said DC electrode at an arbitrary position on said second strip line; a third strip line which is formed on a first principal surface of said dielectric layer and which has a first end connected to a second end of said first strip line; and a fourth strip line which is formed on a first principal surface of said dielectric layer, which has a first end connected to the other balanced input/output terminal, and which is connected to said DC electrode at an arbitrary position on said fourth strip line.
Claim 32
Dependent Claim
64 words
The stacked dielectric filter according to claim 30 , further comprising: an inner layer ground electrode which is provided in said dielectric substrate and which is connected to a ground electrode, wherein said second and fourth strip lines are connected to said DC electrode at respective arbitrary positions on said second and fourth strip lines through via-holes respectively beyond said inner layer ground electrode.
Claim 33
Dependent Claim
61 words
The stacked dielectric filter according to claim 31 , further comprising: an inner layer DC electrode which is provided in said dielectric substrate and which is connected to said DC electrode, wherein said second and fourth strip lines are connected to said inner layer DC electrode at respective arbitrary positions on said second and fourth strip lines through said via-holes respectively.
Claim 34
Dependent Claim
117 words
The stacked dielectric filter according to claim 30 , wherein a width of said first strip line, a length of said first strip line, a width of said second strip line, an electrically effective length of said second strip line, a width of said third strip line, a length of said third strip line, a width of said fourth strip line, an electrically effective length of said fourth strip line, and a dielectric constant or dielectric constants of one or more of said dielectric layers disposed in a region ranging from said first strip line to said fourth strip line are determined corresponding to an output impedance, level balance, and phase balance of said unbalanced-balanced converting section.
Claim 35
Dependent Claim
24 words
The stacked dielectric filter according to claim 33 , wherein an input impedance of said unbalanced-balanced converting section has a value other than 50Ω.
Claim 36
Dependent Claim
38 words
The stacked dielectric filter according to claim 1 , wherein a coupling-adjusting electrode for adjusting a coupling degree for said plurality of resonators is formed at a position separated from said connecting section with said resonators interposed therebetween.
Claim 37
Dependent Claim
53 words
The stacked dielectric filter according to claim 35 , wherein said coupling-adjusting electrode is formed on a first principal surface of one dielectric layer of one or more of said dielectric layers arranged between a plurality of resonant electrodes when said resonators include said plurality of resonant electrodes arranged in a stacking direction.
Claim 38
Dependent Claim
40 words
The stacked dielectric filter according to claim 1 , wherein said plurality of resonators of said filter section have different resonance frequencies respectively; and an apparent reactance element is equivalently connected to an output side of said unbalanced-balanced converting section.
Claim 39
Dependent Claim
14 words
The stacked dielectric filter according to claim 1 , comprising two unbalanced-balanced converting sections.
Claim 40
Dependent Claim
41 words
The stacked dielectric filter according to claim 38 , wherein one of said unbalanced-balanced converting sections is arranged prior to the input of the filter section and the other one of said unbalanced-balanced converting sections is arranged after the filter section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-12-07 | 2008-06-07 | 2008-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-12-07 | 2012-06-07 | 2012-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-12-07 | 2016-06-07 | 2016-12-07 | $7700.00 | Window Closed / Lapsed |