US6525626B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplexer and mobile communication device using the same
Assignee: Murata Manufacturing Co Ltd
•
Filing: 2001-05-29
•
Granted: 2003-02-25
•
Expires: 2021-05-29
Abstract
Abstract A duplexer includes a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side, a receiving-side LC parallel resonant-type filter connected to the receiving-side of the branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated, a surface acoustic wave filter connected to the receiving-side LC parallel resonant-type filter defining a subsequent stage of the receiving-side LC parallel resonant-type filter and arranged to cause the reception signal to be passed and the neighborhood of the high-frequency side of the reception signal to be attenuated, and a transmitting-side LC parallel resonant-type filter connected to the transmitting-side of the branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated.
Inventors
- 👤 Harufumi Mandai
- 👤 Jun Sasaki
- 👤 Noboru Kato
- 👤 Sadayuki Matsumura
- 👤 Hiroaki Tsumori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:40
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/48; H03H7/487; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2135; H03H7/46
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
141 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said branch circuit includes a balun element.
Claim 2
Dependent Claim
141 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said branch circuit includes a balun element.
Claim 3
Dependent Claim
17 words
A duplexer according to claim 1 , wherein said branch circuit further comprises at least two inductors.
Claim 4
Dependent Claim
57 words
A duplexer according to claim 1 , further comprising a multi-layer substrate including a laminated body having a plurality of dielectric layers, wherein said branch circuit, said receiving-side LC parallel resonant-type filter, and said transmitting-side LC parallel resonant filter are integrated in said multi-layer substrate, and said surface acoustic wave filter is mounted on said multi-layer substrate.
Claim 5
Dependent Claim
27 words
A duplexer according to claim 3 , further comprising external terminals disposed on side surfaces from the top surface to the bottom surface of the multi-layer substrate.
Claim 6
Dependent Claim
12 words
A mobile communication device comprising a duplexer according to claim 1 .
Claim 7
Dependent Claim
59 words
A mobile communication device according to claim 5 , further comprising a multi-layer substrate including a laminated body having a plurality of dielectric layers, wherein said branch circuit, said receiving-side LC parallel resonant filter, and said transmitting-side LC parallel resonant filter are integrated in said multi-layer substrate, and said surface acoustic wave filter is mounted on said multi-layer substrate.
Claim 8
Dependent Claim
182 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; and first, second and third terminals, wherein the receiving-side LC parallel resonant filter and the surface acoustic wave filter are connected between the first terminal and the second terminal, and the branch circuit and the transmitting-side LC parallel resonant filter are connected between the first terminal and the third terminal.
Claim 9
Dependent Claim
182 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; and first, second and third terminals, wherein the receiving-side LC parallel resonant filter and the surface acoustic wave filter are connected between the first terminal and the second terminal, and the branch circuit and the transmitting-side LC parallel resonant filter are connected between the first terminal and the third terminal.
Claim 10
Dependent Claim
17 words
A duplexer according to claim 7 , wherein the second terminal is connected to a reception circuit.
Claim 11
Dependent Claim
17 words
A duplexer according to claim 7 , wherein the third terminal is connected to a transmission circuit.
Claim 12
Dependent Claim
16 words
A duplexer according to claim 7 , wherein said branch circuit includes at least two inductors.
Claim 13
Dependent Claim
64 words
A duplexer according to claim 10 , wherein one of the at least two inductors is connected between the first terminal and the second terminal which is connected to the receiving-side LC parallel resonant filter, and the other of the at least two inductors is connected between the first terminal and the third terminal which is connected to the transmitting-side LC parallel resonant filter.
Claim 14
Dependent Claim
16 words
A duplexer according to claim 7 , wherein the first terminal is connected to the attenna.
Claim 15
Dependent Claim
150 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said receiving-side LC parallel resonant filter includes a plurality of inductors and a plurality of capacitors.
Claim 16
Dependent Claim
150 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said receiving-side LC parallel resonant filter includes a plurality of inductors and a plurality of capacitors.
Claim 17
Dependent Claim
94 words
A duplexer according to claim 13 , further comprising first, second and third terminals, wherein a first of the plurality of inductors and a first of the plurality of capacitors are connected in parallel to define a first LC parallel resonator, a second of the plurality of inductors and a second of the plurality of capacitors are connected in parallel to constitute a second LC parallel resonator, and a third of the plurality of inductors and a third of the plurality of capacitors are connected in parallel to constitute a third LC parallel resonator.
Claim 18
Dependent Claim
45 words
A duplexer according to claim 14 , wherein the first, second and third LC parallel resonators are connected to each other in a cascade arrangement between the first terminal connected to the branch circuit and the second terminal connected to the surface acoustic wave filter.
Claim 19
Dependent Claim
150 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said transmitting-side LC parallel resonant filter includes a plurality of inductors and a plurality of capacitors.
Claim 20
Dependent Claim
150 words
A duplexer comprising: a branch circuit connected to an antenna and arranged to branch to a receiving side and a transmitting side; a receiving-side LC parallel resonant filter connected to the receiving-side of said branch circuit and arranged to cause a reception signal to be passed and a transmission signal to be attenuated; a surface acoustic wave filter connected to said receiving-side LC parallel resonant filter defining a subsequent stage of said receiving-side LC parallel resonant filter and arranged to cause the reception signal to be passed and the area near the high-frequency side of the reception signal to be attenuated; and a transmitting-side LC parallel resonant filter connected to the transmitting-side of said branch circuit and arranged to cause the transmission signal to be passed and the reception signal to be attenuated; wherein said transmitting-side LC parallel resonant filter includes a plurality of inductors and a plurality of capacitors.
Claim 21
Dependent Claim
94 words
A duplexer according to claim 16 , further comprising first, second and third terminals, wherein a first of the plurality of inductors and a first of the plurality of capacitors are connected in parallel to define a first LC parallel resonator, a second of the plurality of inductors and a second of the plurality of capacitors are connected in parallel to constitute a second LC parallel resonator, and a third of the plurality of inductors and a third of the plurality of capacitors are connected in parallel to constitute a third LC parallel resonator.
Claim 22
Dependent Claim
38 words
A duplexer according to claim 17 , wherein the first, second and third LC parallel resonators are connected to each other in a cascade arrangement between the first terminal connected to the branch circuit and the third terminal.
References Cited (Backward Citations)
US4910481A
Cited
EP0638953A1
Cited
US5561406A
Cited
US5903820A
Cited
US5726610A
Cited
JPH0983214A
Cited
EP0818883A2
Cited
US5859473A
Cited
JPH11122139A
Cited
US6308051B1
Cited
US6373350B1
Cited
EP1067618A2
Cited
EP1107346A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-02-24 | 2006-08-26 | 2007-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-02-24 | 2010-08-26 | 2011-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-02-24 | 2014-08-26 | 2015-02-25 | $7700.00 | Window Closed / Lapsed |