Patent EP0506340A2 successfully refreshed from Google Patents.
EP0506340A2
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EP
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A dielectric filter
Assignee: Sanyo Electric Co Ltd
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Filing: 1992-03-25
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Granted: —
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Expires: 2012-03-25
Abstract
Abstract In a dielectric filter according to the present invention, a depressed part (28) is formed by removing a portion of an outer peripheral conductor (25c-27c) on the open face side of each of a plurality of one-end face short-circuited type coaxial resonators (25-27) or a portion of the outer peripheral conductor including a dielectric member. A dielectric substrate (29) having a plurality of capacitance forming electrodes (29a-c) for forming antiresonance capacitances between the electrodes and inner peripheral conductors (25d-27d) of the coaxial resonators formed thereon is mounted on the depressed part, and a reactance element (30,31) for coupling the capacitance forming electrodes is provided on the dielectric substrate.
Inventors
- 👤 Yasumi Kobayashi
- 👤 Kousuke Takeuchi
- 👤 Kachio Ikeda
- 👤 Kenichi Shibata
- 👤 Kazuhiko Kuroki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:38
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2136; H01P1/201; H01P1/205; H01P1/2053
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
164 words
A dielectric filter comprising: a plurality of coaxial resonators, each of said coaxial resonators comprising a dielectric block having an outer peripheral surface and an inner peripheral surface parallel to a common axis and having first and second end faces crossing said axis, first and second conductive layers coating said outer peripheral surface and said inner peripheral surface, a third conductive layer formed on said second end face for short-circuiting said first and second conductive layers, and a depressed part formed by removing a portion of the first conductive layer on the side of said first end face or a portion of the first conductive layer including the dielectric block; a dielectric substrate having a plurality of capacitance forming electrodes for forming capacitances between the electrodes and the second conductive layers of said coaxial resonators and external connection means formed thereon and mounted on said depressed part; and reactance means provided on said dielectric substrate for coupling said capacitance forming electrodes to each other.
Claim 2
Dependent Claim
21 words
The dielectric filter according to claim 1, which is constructed by respectively connecting interstage coupling capacitors to said capacitance forming electrodes.
Claim 3
Dependent Claim
21 words
The dielectric filter according to claim 1, wherein said reactance means comprises pattern inductors formed by patterning the capacitance forming electrodes.
Claim 4
Dependent Claim
159 words
A dielectric filter comprising: a dielectric block having an outer peripheral surface and a plurality of inner peripheral surfaces parallel to a common axis and having first and second end faces crossing said axis; a first conductive layer formed on said outer peripheral surface; a plurality of second conductive layers formed on the plurality of inner peripheral surfaces; a third conductive layer formed on said second end face for short-circuiting said first and second conductive layers; a depressed part formed by removing a portion of the first conductive layer on the side of said first end face or a portion of the first conductive layer including the dielectric block; a dielectric substrate having a plurality of capacitance forming electrodes for forming capacitances between the electrodes and the second conductive layers and external connection means formed thereon and mounted on said depressed part; and reactance means provided on said dielectric substrate for coupling said capacitance forming electrodes to each other.
Claim 5
Dependent Claim
21 words
The dielectric filter according to claim 4, wherein said reactance means comprises pattern inductors formed by patterning the capacitance forming electrodes.
Claim 6
Dependent Claim
168 words
A dielectric filter comprising: a plurality of coaxial resonators, each of said coaxial resonators comprising a dielectric block having an outer peripheral surface and an inner peripheral surface parallel to a common axis and having first and second end faces crossing said axis, first and second conductive layers coating said outer peripheral surface and said inner peripheral surface, a third conductive layer formed on said second end face for short-circuiting said first and second conductive layers, and a depressed part formed by removing a portion of the first conductive layer on the side of said first end face or a portion of the first conductive layer including the dielectric block; and a dielectric substrate having a plurality of electrodes for external connection formed on its one major surface and having a plurality of ground electrodes corresponding to said electrodes for external connection and electrically insulated from one another formed on the other major surface and mounted on said depressed part with said one major surface being abutted thereon.
Claim 7
Dependent Claim
55 words
The dielectric filter according to claim 6, wherein parts of the electrodes for external connection formed on said one major surface of said dielectric substrate are capacitance forming electrodes, parts of said ground electrodes on said other major surface correspond to said capacitance forming electrodes, and said ground electrodes are electrically insulated from one another.
Claim 8
Dependent Claim
168 words
A dielectric filter comprising: a dielectric block having an outer peripheral surface and a plurality of inner peripheral surfaces parallel to a common axis and having first and second end faces crossing said axis; a first conductive layer formed on said outer peripheral surface; a plurality of second conductive layers formed on the plurality of inner peripheral surfaces; a third conductive layer formed on said second end face for short-circuiting said first and second conductive layers; and a depressed part formed by removing a portion of the first conductive layer on the side of said first end face or a portion of the first conductive layer including the dielectric block; and a dielectric substrate having a plurality of electrodes for external connection formed on its one major surface and having a plurality of ground electrodes corresponding to said electrodes for external connection and electrically insulated from one another formed on the other major surface and mounted on said depressed part with said one major surface being abutted thereon.
Claim 9
Dependent Claim
55 words
The dielectric filter according to claim 8, wherein parts of the electrodes for external connection formed on said one major surface of said dielectric substrate are capacitance forming electrodes, parts of said ground electrodes on said other major surface correspond to said capacitance forming electrodes, and said ground electrodes are electrically insulated from one another.
Claim 10
Dependent Claim
93 words
A dielectric filter comprisising a plurality of coaxial resonators each having an outer peripheral conductor and an inner peripheral conductor formed by coating an outer peripheral surface and an inner peripheral surface of a dielectric member with a conductive member and having one end face short-circuited, wherein at least one of said plurality of coaxial resonators has a length different from those of the other coaxial resonators, and has the same basic resonance frequency as those of said other coaxial resonators by a resonance frequency correcting capacitance connected to the inner peripheral conductor.
Claim 11
Dependent Claim
35 words
The dielectric filter according to claim 10, wherein said resonance frequency correcting capacitance is formed by mounting the dielectric member having a capacitance forming conductor formed thereon on an open surface of the coaxial resonator.
Claim 12
Dependent Claim
203 words
A antenna duplexer comprising: a filter for reception and a filter for transmission each comprising a plurality of coaxial resonators each having an outer peripheral conductor and an inner peripheral conductor formed by coating an outer peripheral surface and an inner peripheral surface of a dielectric member with a conductive member and having one end face short-circuited, and having a depressed part formed by removing a portion of the outer peripheral conductor on the open face side or a portion of the outer peripheral conductor including the dielectric member; and a dielectric substrate having a plurality of capacitance forming electrodes for forming capacitances between the electrodes and the inner peripheral conductors of said coaxial resonators, a reactance element for coupling the capacitance forming electrodes, and a matching circuit on the reception side and a matching circuit on the transmission side for connecting said filter for reception and said filter for transmission to one antenna formed thereon, each of said filter for reception and said filter for transmission being constructed by mounting the depressed part of said plurality of coaxial resonators on positions where said capacitance forming electrodes corresponding to the inner peripheral conductors of said coaxial resonators are formed on said dielectric substrate.
Claim 13
Dependent Claim
31 words
The antenna duplexer according to claim 12, wherein each of said matching circuit on the reception side and said matching circuit on the transmission side is constituted by a transmission line.
Claim 14
Dependent Claim
35 words
The antenna duplexer according to claim 12, wherein each of said matching circuit on the reception side and said matching circuit on the -transmission side is constituted by an inductance element and a capacitance element.
Claim 15
Dependent Claim
196 words
A antenna duplexer comprising: a filter for reception and a filter for transmission each including coaxial resonators each having one end face short-circuited, which has an outer peripheral conductor and inner peripheral conductors formed by providing a dielectric member with at least two holes and coating an outer peripheral surface of the dielectric member and inner peripheral surfaces of the through holes with a conductive member and has a depressed part formed by removing a portion of the outer peripheral conductor on the open face side or a portion of the outer peripheral conductor including the dielectric member; and a dielectric substrate having a plurality of capacitance forming electrodes for forming capacitances between the electrodes and the inner peripheral conductors, a reactance element for coupling the capacitance forming electrodes, and a matching circuit on the reception side and a matching circuit on the transmission side for connecting said filter for reception and said filter for transmission to one antenna, each of said filter for reception and said filter for transmission being constructed by mounting the depressed part to positions where said capacitance forming electrodes corresponding to the inner peripheral conductors are formed on said dielectric substrate.
Claim 16
Dependent Claim
31 words
The antenna duplexer according to claim 15, wherein each of said matching circuit on the reception side and said matching circuit on the transmission side is constituted by a transmission line.
Claim 17
Dependent Claim
35 words
The antenna duplexer according to claim 15, wherein each of said matching circuit on the reception side and said matching circuit on the transmission side is constituted by an inductance element and a capacitance element.
Claim 18
Dependent Claim
105 words
An antenna duplexer comprising a dielectric filter for reception and a dielectric filter for transmission, one ends of both the dielectric filters being connected to an antenna shared terminal, wherein said antenna shared terminal, the one end of said filter for reception and the one end of said filter for transmission are respectively grounded through capacitive elements or inductive elements, and wherein said antenna shared terminal is connected to said one end of the filter for reception through the capacitive element or the inductive element, while being connected to said one end of the filter for transmission through the capacitive element or the inductive element.
Claim 19
Dependent Claim
59 words
The antenna duplexer according to claim 18, wherein a part of the capacitive elements or the inductive elements through which the antenna shared terminal, the one end of the filter for reception and the one end of the filter for transmission are connected to each other or grounded is omitted by having a short-circuited structure or an opened structure.
Claim 20
Dependent Claim
34 words
The antenna duplexer according to claim 19, wherein the dielectric filter for reception is a band-pass filter having a pole in the rejection range, and the dielectric filter for transmission is a band-rejection filter.
Claim 21
Dependent Claim
27 words
The antenna duplexer according to claim 19, wherein a chip capacitor is used as the capacitive element, and a pattern inductance is used as the inductive element.
Claim 22
Dependent Claim
47 words
A filter comprising at least one resonator and a substrate having a conductive track thereon, the resonator having a recessed surface portion and being mounted to the substrate at said recessed portion such that there is capacitance between the resonator and a portion of the conductive track.
Claim 23
Dependent Claim
50 words
A filter comprising a plurality of resonators and a substrate having a conductive track thereon the resonators being mounted to the substrate so as to form a capacitor with respective portions of the track and wherein at least one of the resonators is shorter in length than the other resonators.
References Cited (Backward Citations)
No citation records indexed.
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