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US5604470A
Expired / Lapsed
US
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Duplexer having transmit and receive sections mounted on a single substrate
Assignee: Murata Manufacturing Co Ltd
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Filing: 1995-04-13
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Granted: 1997-02-18
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Expires: 2015-04-13
Abstract
Abstract A duplexer usable for both transmission and reception in a mobile communication apparatus such as a car phone has both its transmission section and reception section mounted on a single substrate. The transmission section is connected between an input terminal and an antenna terminal and includes an isolator and either a circuit having only inductors and capacitors or a trap circuit having a dielectric resonator and an inductor and a II-type low-pass filter having an inductor and capacitors. The reception section is comprised of a filter using dielectric resonators.
Inventors
- 👤 Masayuki Atokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:16
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2136
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
A duplexer comprising: a transmission section consisting of an isolator and a transmission circuit devoid of any resonators and comprising inductors and capacitors; a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter.
Claim 2
Dependent Claim
60 words
A duplexer comprising: a transmission section consisting of an isolator and a transmission circuit devoid of any resonators and comprising inductors and capacitors; a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter.
Claim 3
Dependent Claim
42 words
The duplexer of claim 1 wherein said transmission section consists of said isolator and a transmission circuit consisting of inductors and capacitors, wherein said reception section consists of said reception filter, and wherein said reception filter consists of dielectric resonators and capacitors.
Claim 4
Dependent Claim
42 words
The duplexer of claim 2 wherein said inductors and capacitors of said transmission circuit are connected such that said transmission circuit comprises a π-type low-pass filter having an inductor and capacitors and a series-connected resonance circuit having an inductor and a capacitor.
Claim 5
Dependent Claim
43 words
The duplexer of claim 2 further comprising an antenna terminal, an input terminal and an output terminal, said transmission section being connected between said antenna terminal and said input terminal, said reception section being connected between said antenna terminal and said output terminal.
Claim 6
Dependent Claim
42 words
The duplexer of claim 4 wherein said inductors and capacitors of said transmission circuit are connected such that said transmission circuit comprises a π-type low-pass filter having an inductor and capacitors and a series-connected resonance circuit having an inductor and a capacitor.
Claim 7
Dependent Claim
43 words
The duplexer of claim 1 further comprising an antenna terminal, an input terminal and an output terminal, said transmission section being connected between said antenna terminal and said input terminal, said reception section being connected between said antenna terminal and said output terminal.
Claim 8
Dependent Claim
42 words
The duplexer of claim 6 wherein said inductors and capacitors of said transmission circuit are connected such that said transmission circuit comprises a π-type low-pass filter having an inductor and capacitors and a series-connected resonance circuit having an inductor and a capacitor.
Claim 9
Dependent Claim
42 words
The duplexer of claim 1 wherein said inductors and capacitors of said transmission circuit are connected such that said transmission circuit comprises a π-type low-pass filter having an inductor and capacitors and a series-connected resonance circuit having an inductor and a capacitor.
Claim 10
Dependent Claim
16 words
The duplexer of claim 1 further comprising grounding electrodes formed on surfaces of said single substrate.
Claim 11
Dependent Claim
67 words
A duplexer comprising: a transmission section comprising an isolator, a trap circuit having a single dielectric resonator and a capacitor, and a π-type low-pass filter having an inductor and capacitors; a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter.
Claim 12
Dependent Claim
67 words
A duplexer comprising: a transmission section comprising an isolator, a trap circuit having a single dielectric resonator and a capacitor, and a π-type low-pass filter having an inductor and capacitors; a reception section comprising a reception filter having a dielectric resonator apparatus; and a single substrate on which said transmission and reception sections are mounted, said transmission circuit functioning to match said isolator with said reception filter.
Claim 13
Dependent Claim
25 words
The duplexer of claim 10 wherein said reception section consists of said reception filter, and wherein said reception filter consists of dielectric resonators and capacitors.
Claim 14
Dependent Claim
43 words
The duplexer of claim 11 further comprising an antenna terminal, an input terminal and an output terminal, said transmission section being connected between said antenna terminal and said input terminal, said reception section being connected between said antenna terminal and said output terminal.
Claim 15
Dependent Claim
43 words
The duplexer of claim 10 further comprising an antenna terminal, an input terminal and an output terminal, said transmission section being connected between said antenna terminal and said input terminal, said reception section being connected between said antenna terminal and said output terminal.
Claim 16
Dependent Claim
16 words
The duplexer of claim 10 further comprising grounding electrodes formed on surfaces of said single substrate.
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) | 2000-02-18 | 2000-08-19 | 2001-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-18 | 2004-08-19 | 2005-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-18 | 2008-08-19 | 2009-02-18 | $7700.00 | Window Closed / Lapsed |