US6420942B1
Expired / Lapsed
US
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Dielectric filter, dielectric duplexer, and communication apparatus
Assignee: Murata Manufacturing Co Ltd
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Filing: 2000-06-01
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Granted: 2002-07-16
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Expires: 2020-06-01
Abstract
Abstract A λ/2 resonator comprises an inner conductor formed hole having an inner conductor with both open-ends, formed therein, and λ/4 resonators comprise inner conductor formed holes having inner conductors with one short-circuited ends and the other open ends, respectively. The resonators are coupled, whereby a terminal electrode connected to the vicinity of the one open end of one of the λ/4 resonators functions as an unbalanced terminal, and terminal electrodes connected to both open ends of the λ/2 resonator function as balanced terminals.
Inventors
- 👤 Motoharu Hiroshima
- 👤 Katsuhito Kuroda
- 👤 Shohachi Nishijima
- 👤 Hideyuki Kato
- 👤 Haruo Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:39
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056; H01P5/00; H01P5/08; H01P5/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A dielectric filter, comprising: a single dielectric member; a conductor film disposed on the single dielectric member; a λ/2 resonator comprising a strip electrode provided in association with the single dielectric member, resonating substantially at a half wavelength of a predetermined frequency; a λ/4 resonator comprising a strip electrode provided in association with the single dielectric member, resonating substantially at a quarter wavelength of the predetermined frequency; a first terminal comprising a respective strip electrode capacitively connected to the λ/4 resonator and functioning as an unbalanced terminal; and second terminals respectively comprising strip electrodes capacitively connected to the λ/2 resonator and functioning as balanced terminals.
Claim 2
Dependent Claim
105 words
A dielectric filter, comprising: a single dielectric member; a conductor film disposed on the single dielectric member; a λ/2 resonator comprising a strip electrode provided in association with the single dielectric member, resonating substantially at a half wavelength of a predetermined frequency; a λ/4 resonator comprising a strip electrode provided in association with the single dielectric member, resonating substantially at a quarter wavelength of the predetermined frequency; a first terminal comprising a respective strip electrode capacitively connected to the λ/4 resonator and functioning as an unbalanced terminal; and second terminals respectively comprising strip electrodes capacitively connected to the λ/2 resonator and functioning as balanced terminals.
Claim 3
Dependent Claim
44 words
The dielectric filter according to claim 1 , wherein said λ/4 resonator has a short-circuited end and an open end, said open end being coupled by a stray capacitance to said conductor film and said short-circuited end being grounded directly to said conductor film.
Claim 4
Dependent Claim
11 words
A communication apparatus including the dielectric filter of claim 1 .
Claim 5
Dependent Claim
28 words
The dielectric filter according to claim 1 , wherein at least one of the λ/2 resonator and the λ/4 resonator comprises a micro-strip line or a strip line.
Claim 6
Dependent Claim
11 words
A dielectric duplexer including the dielectric filter of claim 1 .
Claim 7
Dependent Claim
11 words
A communication apparatus including the dielectric duplexer of claim 5 .
Claim 8
Dependent Claim
165 words
A dielectric filter, comprising: a single dielectric member; a conductor film disposed on the single dielectric member; a λ/2 resonator comprising a respective strip electrode provided in association with the single dielectric member, resonating substantially at a half wavelength of a predetermined frequency; a first λ/4 resonator comprising a respective strip electrode provided in association with the single dielectric member, and resonating substantially at a quarter wavelength of the predetermined frequency; a second λ/4 resonator comprising a respective strip electrode provided in association with the single dielectric member, and resonating substantially at a quarter wavelength of the predetermined frequency; a first terminal comprising a respective strip electrode capacitively connected to the λ/4 resonator and functioning as an unbalanced terminal and second terminals respectively comprising strip electrodes capacitively connected to the λ/2 resonator and functioning as balanced terminals wherein said first and second λ/4 resonators are comb-line coupled to each other, and said second λ/4 resonator and said λ/2 resonator are interdigitally coupled to each other.
Claim 9
Dependent Claim
165 words
A dielectric filter, comprising: a single dielectric member; a conductor film disposed on the single dielectric member; a λ/2 resonator comprising a respective strip electrode provided in association with the single dielectric member, resonating substantially at a half wavelength of a predetermined frequency; a first λ/4 resonator comprising a respective strip electrode provided in association with the single dielectric member, and resonating substantially at a quarter wavelength of the predetermined frequency; a second λ/4 resonator comprising a respective strip electrode provided in association with the single dielectric member, and resonating substantially at a quarter wavelength of the predetermined frequency; a first terminal comprising a respective strip electrode capacitively connected to the λ/4 resonator and functioning as an unbalanced terminal and second terminals respectively comprising strip electrodes capacitively connected to the λ/2 resonator and functioning as balanced terminals wherein said first and second λ/4 resonators are comb-line coupled to each other, and said second λ/4 resonator and said λ/2 resonator are interdigitally coupled to each other.
Claim 10
Dependent Claim
18 words
A dielectric duplexer comprising two filters, one of said filters being the dielectric filter of claim 7 .
Claim 11
Dependent Claim
28 words
A communication apparatus comprising a communication circuit including at least one of a transmitting circuit and a receiving circuit, and connected thereto, the duplexer of claim 8 .
Claim 12
Dependent Claim
29 words
A communication apparatus comprising a communication circuit including at least one of a transmitting circuit and a receiving circuit, and connected thereto, the dielectric filter of claim 7 .
Claim 13
Dependent Claim
45 words
The dielectric filter according to claim 7 , wherein each said λ/4 resonator has a short-circuited end and an open end, said open end being coupled by a stray capacitance to said conductor film and said short-circuited end being grounded directly to said conductor film.
References Cited (Backward Citations)
EP0570125A1
Cited
US6018277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-07-15 | 2006-01-14 | 2006-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-07-15 | 2010-01-14 | 2010-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-07-15 | 2014-01-14 | 2014-07-16 | $7700.00 | Window Closed / Lapsed |