US6359529B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering device comprising filters, each having a resonance line, a coupling element coupled to said resonance line, and a switch for short-circuiting said resonance line
Assignee: Murata Manufacturing Co Ltd
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Filing: 1997-12-24
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Granted: 2002-03-19
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Expires: 2017-12-24
Abstract
Abstract The invention provides a filtering device of the transmission-reception switched type which can be constructed in a form with a reduced size at a low cost without having to use circuit elements such as a capacitor, a coil, and a transmission line forming a phase shift circuit which are not essential to the filtering device. Inner conductors serving as distributed-parameter resonance lines are formed in a dielectric block. There is provided a coupling line coupled with particular inner conductors. The open-circuited ends of these particular inner conductors are connected to an outer conductor via corresponding diode switches so that transmission and reception filters are switched from each other when either diode switch is selectively turned on.
Inventors
- 👤 Kikuo Tsunoda
- 👤 Hitoshi Tada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:04
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/213; H01P1/2135; H01P1/202; H01P1/205; H01P1/2136
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
180 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines respectively comprise a corresponding plurality of dielectric coaxial resonators each having an inner conductor formed in a dielectric block and an outer conductor formed on an outer surface of said dielectric block; and wherein each said inner conductor is formed on the inner surface of a corresponding hole produced in said dielectric block, and said switch is disposed inside said hole.
Claim 2
Dependent Claim
180 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines respectively comprise a corresponding plurality of dielectric coaxial resonators each having an inner conductor formed in a dielectric block and an outer conductor formed on an outer surface of said dielectric block; and wherein each said inner conductor is formed on the inner surface of a corresponding hole produced in said dielectric block, and said switch is disposed inside said hole.
Claim 3
Dependent Claim
16 words
A filtering device according to claim 1 , wherein said dielectric coaxial resonators are disposed interdigitally.
Claim 4
Dependent Claim
161 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited, a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines respectively comprise a corresponding, plurality of inner conductors formed in a dielectric block; and wherein each said inner conductor is formed on the inner surface of a corresponding hole produced in said dielectric block, and said switch is disposed inside said hole.
Claim 5
Dependent Claim
161 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited, a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines respectively comprise a corresponding, plurality of inner conductors formed in a dielectric block; and wherein each said inner conductor is formed on the inner surface of a corresponding hole produced in said dielectric block, and said switch is disposed inside said hole.
Claim 6
Dependent Claim
16 words
A filtering device according to claim 3 , wherein said distributed-parameter resonance lines arc disposed interdigitally.
Claim 7
Dependent Claim
122 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines are disposed interdigitally.
Claim 8
Dependent Claim
122 words
A filtering device comprising: a plurality of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; wherein said distributed-parameter resonance lines are disposed interdigitally.
Claim 9
Dependent Claim
19 words
A filtering device according to claim 5 , wherein both ends of each said distributed-parameter resonance line are open-circuited.
Claim 10
Dependent Claim
188 words
A duplexer comprising: a pair of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; an input port connected in common to said pair of filters; a pair of output ports connected respectively to said pair of filters; and said at least one distributed-parameter resonance line in each said filter being adjacent to said input port; wherein each said distributed-parameter resonance line comprises an inner conductor which is formed on the inner surface of a corresponding hole produced in a dielectric block, and said switch is disposed inside said hole.
Claim 11
Dependent Claim
188 words
A duplexer comprising: a pair of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; an input port connected in common to said pair of filters; a pair of output ports connected respectively to said pair of filters; and said at least one distributed-parameter resonance line in each said filter being adjacent to said input port; wherein each said distributed-parameter resonance line comprises an inner conductor which is formed on the inner surface of a corresponding hole produced in a dielectric block, and said switch is disposed inside said hole.
Claim 12
Dependent Claim
16 words
A filtering device according to claim 7 , wherein said distributed-parameter resonance lines are disposed interdigitally.
Claim 13
Dependent Claim
162 words
A duplexer comprising: a pair of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; an input port connected in common to said pair of filters; a pair of output ports connected respectively to said pair of filters; and said at least one distributed-parameter resonance line in each said filter being adjacent to said input port; wherein said distributed-parameter resonance lines are disposed interdigitally.
Claim 14
Dependent Claim
162 words
A duplexer comprising: a pair of filters, each said filter having at least one distributed-parameter resonance line, at least one end of which is open-circuited; a coupling element in each said filter, said coupling element being coupled to said at least one said distributed-parameter resonance line in the corresponding said filter; and a switch in at least one said filter, said switch being connected to said open-circuited end of said at least one distributed-parameter resonance line in the corresponding said filter and to ground, so that said at least one distributed-parameter resonance line is short-circuited to ground when said switch is ON, thereby isolating said at least one filter from said coupling element; an input port connected in common to said pair of filters; a pair of output ports connected respectively to said pair of filters; and said at least one distributed-parameter resonance line in each said filter being adjacent to said input port; wherein said distributed-parameter resonance lines are disposed interdigitally.
References Cited (Backward Citations)
US4467296A
Cited
US4980660A
Cited
US5023935A
Cited
US5065120A
Cited
EP0520641A1
Cited
EP0570184A1
Cited
US5737696A
Cited
US5521561A
Cited
US5712648A
Cited
US5742215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-03-18 | 2005-09-17 | 2006-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-03-18 | 2009-09-17 | 2010-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-03-18 | 2013-09-17 | 2014-03-19 | $7700.00 | Window Closed / Lapsed |