Patent US6801101B2 successfully refreshed from Google Patents.
US6801101B2
Expired / Lapsed
US
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Dielectric filter, dielectric duplexer, and communication apparatus
Assignee: Murata Manufacturing Co Ltd
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Filing: 2003-01-09
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Granted: 2004-10-05
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Expires: 2023-01-09
Abstract
Abstract A dielectric filter including: a λ/2 resonator for generating resonance of ½-wavelength at a predetermined frequency, having both ends open-circuited or short-circuited; and a pair λ/4 resonators respectively for generating resonance of ¼-wavelength at a frequency substantially equal to the predetermined frequency, each having one end open-circuited and the other end short-circuited; wherein the pair of λ/4 resonators are disposed in proximity to each of both ends from the vicinity of the center of the λ/2 resonator; a terminal coupling to the λ/2 resonator is provided as an unbalanced terminal; and terminals coupling to the pair of λ/4 resonators is used as a balanced terminal. In the above filter, the balanced-type input/output of signals can be performed without using a balun.
Inventors
- 👤 Motoharu Hiroshima
- 👤 Shohachi Nishijima
- 👤 Hideyuki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:25
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205; H01P1/2056; B; B21; B21B; B21B39/00; B21B39/02; H01P1/213; H01P1/2136; H01P5/00; H01P5/08; H01P5/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A dielectric filter comprising: a first λ/2 resonator for generating resonance at a length of substantially ½ wavelength at a predetermined frequency, said first λ/2 resonator having both ends open-circuited or short-circuited; a second λ/2 resonator for generating resonance at a length of substantially ½ wavelength at a frequency substantially equal to the predetermined frequency, said second λ/2 resonator having both ends open-circuited, said second λ/2 resonator disposed in proximity to said first λ/2 resonator; an unbalanced terminal coupled to the first λ/2 resonator; and a balanced terminal coupled to the second λ/2 resonator.
Claim 2
Dependent Claim
94 words
A dielectric filter comprising: a first λ/2 resonator for generating resonance at a length of substantially ½ wavelength at a predetermined frequency, said first λ/2 resonator having both ends open-circuited or short-circuited; a second λ/2 resonator for generating resonance at a length of substantially ½ wavelength at a frequency substantially equal to the predetermined frequency, said second λ/2 resonator having both ends open-circuited, said second λ/2 resonator disposed in proximity to said first λ/2 resonator; an unbalanced terminal coupled to the first λ/2 resonator; and a balanced terminal coupled to the second λ/2 resonator.
Claim 3
Dependent Claim
19 words
The dielectric filter according to claim 1 , wherein each said λ/2 resonator comprises a microstripline or a stripline.
Claim 4
Dependent Claim
18 words
The dielectric filter according to claim 1 , wherein each said λ/2 resonator comprises a dielectric coaxial resonator.
Claim 5
Dependent Claim
52 words
A dielectric duplexer comprising the dielectric filter of claim 1 , and further comprising a second dielectric filter having two balanced or unbalanced terminals, wherein a respective terminal of said second dielectric filter and a corresponding terminal of said first-mentioned dielectric filter are interconnected to provide a common terminal of said duplexer.
Claim 6
Dependent Claim
49 words
A communication apparatus comprising the dielectric duplexer of claim 4 , further comprising an antenna terminal connected to said common terminal of said duplexer, and a transmission circuit and a reception circuit connected respectively to corresponding ones of said terminals other than the terminals connected to said antenna terminal.
Claim 7
Dependent Claim
40 words
A communication apparatus comprising the dielectric filter of claim 1 , and further comprising a high frequency circuit including at least one of a transmission circuit and a reception circuit, said dielectric filter being connected to said high frequency circuit.
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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) | 2007-10-05 | 2008-04-05 | 2008-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-05 | 2012-04-05 | 2012-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-05 | 2016-04-05 | 2016-10-05 | $7700.00 | Window Closed / Lapsed |