US5276412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency filter having increased mechanical strength
Assignee: Panasonic Holdings Corp
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Filing: 1992-05-29
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Granted: 1994-01-04
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Expires: 2012-05-29
Abstract
Abstract A high-frequency filter of the type having a plurality of resonators open at least at one end thereof, a dielectric board forming an input/output coupling and an interstage coupling, and a case for holding therein the resonators and the dielectric board, wherein the dielectric board is made of a ceramic having a critical stress intensity factor K1c of not less than 5 MPa*m1/2and a dielectric dissipation factor tan. (delta) of not exceeding 1% in a working frequency band of said high-frequency filter, and wherein electrodes are provided on the dielectric board to form an input/output coupling capacity and an interstage coupling capacity. The high-frequency filter of the foregoing construction has the advantage of an excellent mechanical strength which is capable of withstanding severe mechanical loads such as falling impacts or various stresses.
Inventors
- 👤 Takehiko Yoneda
- 👤 Kazuhiro Eguchi
- 👤 Hiromitsu Taki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2053
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
86 words
A high-frequency filter which comprises a plurality of resonators open at least at one end thereof, a plurality of input/output terminals, and a dielectric board supporting thereon said resonators and said input/output terminals and forming an input/output coupling and an interstage coupling, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m 1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 2
Dependent Claim
86 words
A high-frequency filter which comprises a plurality of resonators open at least at one end thereof, a plurality of input/output terminals, and a dielectric board supporting thereon said resonators and said input/output terminals and forming an input/output coupling and an interstage coupling, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m 1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 3
Dependent Claim
18 words
A high-frequency filter according to claim 1, wherein said ceramic contains, as the principal ingredient, partial stabilized zirconia.
Claim 4
Dependent Claim
17 words
A high-frequency filter according to claim 1, wherein said ceramic contains, as the principal ingredient, tetragonal zirconia.
Claim 5
Dependent Claim
48 words
A high-frequency filter according to claim 1, wherein said ceramic comprises 85 to 98 mol percent of ZrO 2 , and 15 to 2 mol percent of at least one component selected from the group consisting of CeO 2 , CaO, MgO and Y 2 O 3 .
Claim 6
Dependent Claim
45 words
A high-frequency filter according to claim 1, wherein said ceramic includes up to 0.5 part by weight, per 100 parts by weight of partial stabilized zirconia, of at least one component selected from the group consisting of Al 2 O 3 and SiO 2 .
Claim 7
Dependent Claim
44 words
A high-frequency filter according to claim 1, wherein said ceramic includes up to 0.5 part by weight, per 100 parts by weight of tetragonal zirconia, of at least one component selected from the group consisting of Al 2 O 3 and SiO 2 .
Claim 8
Dependent Claim
44 words
A high-frequency filter according to claim 1, wherein said ceramic includes up to 1 part by weight, per 100 parts by weight of partial stabilized zirconia, of at least one component selected from the group consisting of TiO 2 , CoO, MnO and NiO.
Claim 9
Dependent Claim
43 words
A high-frequency filter according to claim 1, wherein said ceramic includes up to 1 part by weight, per 100 parts by weight of tetragonal zirconia, of at least one component selected from the group consisting of TiO 2 , CoO, MnO and NiO.
Claim 10
Dependent Claim
96 words
A high-frequency filter which comprises a dielectric board, a plurality of electrodes formed on said dielectric board, a plurality of resonators of the coaxial type connected respectively to said electrodes, a plurality of input/output terminals attached to said dielectric board, and a case attached to said dielectric board for closing said resonators, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m 1/2 and a dielectric dissipation factor tan δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 11
Dependent Claim
96 words
A high-frequency filter which comprises a dielectric board, a plurality of electrodes formed on said dielectric board, a plurality of resonators of the coaxial type connected respectively to said electrodes, a plurality of input/output terminals attached to said dielectric board, and a case attached to said dielectric board for closing said resonators, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m 1/2 and a dielectric dissipation factor tan δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 12
Dependent Claim
18 words
A high-frequency filter according to claim 9, wherein said ceramic contains, as the principal ingredient, partial stabilized zirconia.
Claim 13
Dependent Claim
17 words
A high-frequency filter according to claim 9, wherein said ceramic contains, as the principal ingredient, tetragonal zirconia.
Claim 14
Dependent Claim
48 words
A high-frequency filter according to claim 9, wherein said ceramic comprises 85 to 98 mol percent of ZrO 2 , and 15 to 2 mol percent of at least one component selected from the group consisting of CeO 2 , CaO, MgO and Y 2 O 3 .
Claim 15
Dependent Claim
45 words
A high-frequency filter according to claim 9, wherein said ceramic includes up to 0.5 part by weight, per 100 parts by weight of partial stabilized zirconia, of at least one component selected from the group consisting of Al 2 O 3 and SiO 2 .
Claim 16
Dependent Claim
44 words
A high-frequency filter according to claim 9, wherein said ceramic includes up to 0.5 part by weight, per 100 parts by weight of tetragonal zirconia, of at least one component selected from the group consisting of Al 2 O 3 and SiO 2 .
Claim 17
Dependent Claim
44 words
A high-frequency filter according to claim 9, wherein said ceramic includes up to 1 part by weight, per 100 parts by weight of partial stabilized zirconia, of at least one component selected from the group consisting of TiO 2 , CoO, MnO and NiO.
Claim 18
Dependent Claim
43 words
A high-frequency filter according to claim 9, wherein said ceramic includes up to 1 part by weight, per 100 parts by weight of tetragonal zirconia, of at least one component selected from the group consisting of TiO 2 , CoO, MnO and NiO.
Claim 19
Dependent Claim
14 words
A high-frequency filter according to claim 9, wherein said electrodes are made of Ag.
Claim 20
Dependent Claim
110 words
A high-frequency filter in combination with movable radio communication equipment comprising: a plurality of resonators open at least at one end thereof, a plurality of input/output terminals, and a dielectric board supporting thereon said resonators and said input/output terminals and forming an input/output coupling and an interstage coupling, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter. a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 21
Dependent Claim
110 words
A high-frequency filter in combination with movable radio communication equipment comprising: a plurality of resonators open at least at one end thereof, a plurality of input/output terminals, and a dielectric board supporting thereon said resonators and said input/output terminals and forming an input/output coupling and an interstage coupling, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 MPa·m1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter. a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 22
Dependent Claim
101 words
A high-frequency filter in combination with movable radio communication equipment comprising: a dielectric board, a plurality of electrodes formed on said dielectric board, a plurality of resonators of the coaxial type connected respectively to said electrodes, a plurality of input/output terminals attached to said dielectric board, and a case attached to said dielectric board for closing said resonators, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 Mpa·m1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 23
Dependent Claim
101 words
A high-frequency filter in combination with movable radio communication equipment comprising: a dielectric board, a plurality of electrodes formed on said dielectric board, a plurality of resonators of the coaxial type connected respectively to said electrodes, a plurality of input/output terminals attached to said dielectric board, and a case attached to said dielectric board for closing said resonators, wherein said dielectric board is made of a ceramic having a critical stress intensity factor K 1c of not less than 5 Mpa·m1/2 and a dielectric dissipation factor tan. δ of not exceeding 1% in a working frequency band of said high-frequency filter.
Claim 24
Dependent Claim
55 words
A high-frequency filter in combination with movable radio communication equipment according to claim 19, wherein said ceramic comprises 85 to 98 mol percent of ZrO 2 , and 15 to 2 mol percent of at least one component selected from the group consisting of CeO 2 , CaO, MgO and Y 2 O 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |