Claims
- 1. A duplexer of an integrated shape comprising a receiving terminal for connection to a receiving circuit, a transmitting terminal for connection to a transmitting circuit, an antenna terminal for connection to an antenna, a first transmission line, a second transmission line, a third transmission line, a transmission line for a transmitting filter, a plurality of capacitor elements for said transmitting filter, a plurality of capacitor elements for a receiving filter, a plurality of resonators for said transmitting filter and a plurality of resonators for said receiving filter,wherein (1) one end of said first transmission line is connected to one end of said second transmission line and one end of said third transmission line, (2) said transmission line for said transmitting filter is connected to said plural resonators for said transmitting filter via said capacitor elements for said transmitting filter, respectively, (3) the other end of said third transmission line is connected to one end of said transmission line for said transmitting filter, (4) the other end of said transmission line for said transmitting filter is connected to said transmitting terminal, (5) said resonators for said receiving filter arranged in parallel are connected to one another via said capacitor elements for said receiving filter, (6) a said resonator disposed at one end of the arrangement of said plural resonators for said receiving filter is connected to the other end of said first transmission line via a said capacitor element for said receiving filter, (7) a said resonator disposed at the other end of the arrangement of said plural resonators is connected to said receiving terminal via a said capacitor element for said receiving filter, and (8) the other end of said second transmission line is connected to said antenna terminal, and wherein (1) said duplexer includes a plurality of dielectric layers laminated together, (2) at least one of said transmission lines is located between two of said dielectric layers of said plurality of dielectric layers, (3) at least one of said capacitor elements is located between two of said dielectric layers of said plurality of dielectric, layers, and (4) at least one of said resonators is located between two of said dielectric layers of said plurality of dielectric layers.
- 2. A duplexer in accordance with claim 1, wherein all of said resonators or said plurality of resonators for said transmitting filter and all of said resonators of said plurality of resonators for said receiving filter are located between said dielectric layers of said plurality of dielectric layers.
- 3. A duplexer in accordance with claim 2, wherein all of said transmission lines are located between said dielectric layers of said plurality of dielectric layers.
- 4. A duplexer of an integrated shape comprising a receiving circuit for connection to a receiving circuit, a transmitting terminal for connection to a transmitting circuit, an antenna terminal for connection to an antenna, a first transmission line, a second transmission line, a third transmission line, a transmission line for a transmitting filter, a plurality of capacitor elements for said transmitting filter, a plurality of capacitor elements for said transmitting filter, a plurality of capacitor elements for a receiving filter, a plurality of resonators for said transmitting filter and a plurality of resonators for said receiving filter,wherein (1) one end of said first transmission line is connected to one end of said second transmission line and one end of said third transmission line, (2) said transmission line for said transmitting filter is connected to said plural resonators for said transmitting filter via said capacitor elements for said transmitting filter, respectively, (3) the other end of said third transmission line is connected to one end of said transmission line for said transmitting filter, (4) the other end of said transmission line for said transmitting filter is connected to said transmitting terminal, (5) said resonators for said receiving filter arranged in parallel are connected to one another via said capacitor elements for said receiving filter, (6) a said resonator disposed at one end of the arrangement of said plural resonators for said receiving filter is connected to the other end of said first transmission line via a said capacitor element for said receiving filter, (7) a said resonator disposed at the other end of the arrangement of said plural resonators is connected to said receiving, terminal via a said capacitor element for said receiving filter, and (8) the other end of said second transmission line is connected to said antenna terminal; wherein one end or a fourth transmission line is connected to the connection point of said first transmission line, said second transmission line and said third transmission line, and the other end of said fourth transmission line is grounded.
- 5. A duplexer of an integrated shape comprising a receiving terminal for connection to a receiving circuit, a transmitting terminal for connection to a transmitting circuit, all antenna terminal for connection to an antenna, a first transmission line, a second transmission line, a third transmission line, a transmission line for a transmitting filter, a plurality of capacitor elements for said transmitting filter, a plurality of capacitor elements for said transmitting filter, a plurality of capacitor elements for a receiving filter, a plurality of resonators for said transmitting filter and a plurality of resonators for said receiving filter,wherein (1) one end of said first transmission line is connected to one end of said second transmission line and one end of said third transmission line, (2) said transmission line for said transmitting filter is connected to said plural resonators for said transmitting filter via said capacitor elements for said transmitting filter, respectively, (3) the other end of said third transmission line is connected to one end of said transmission line for said transmitting filter, (4) the other end of said transmission line for said transmitting, filter is connected to said transmitting terminal, (5) said resonators for said receiving filter arranged in parallel are connected to one another via said capacitor elements for said receiving filter, (6) a said resonator disposed at one end of the arrangement of said plural resonators for said receiving filter is connected to the other end of said first transmission line via a said capacitor element for said receiving filter, (7) it said resonator disposed at the other end of the arrangement of said plural resonators is connected to said receiving terminal via a said capacitor element for said receiving filter, and (8) the other end of said second transmission line is connected to said antenna terminal; wherein when it is assumed that impedance at connection point of said first transmission line and said third transmission line is Za, characteristic impendence Zo of said second transmission line satisfies a relation in which Zo×Zo is substantially equal to Za×50.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-349767 |
Dec 1997 |
JP |
|
10-352410 |
Dec 1998 |
JP |
|
Parent Case Info
This application is a Division of application Ser. No. 09/215,132 filed Dec. 18, 1998.
US Referenced Citations (7)
Foreign Referenced Citations (3)
Number |
Date |
Country |
5-218705 |
Aug 1993 |
JP |
6-268410 |
Sep 1994 |
JP |
6-268411 |
Sep 1994 |
JP |
Non-Patent Literature Citations (3)
Entry |
Patent Abstracts of Japan, vol. 1995, No. 08, Sep. 29, 1995 (JP 07-122905). |
Patent Abstracts of Japan, vol. 018, No. 675, Dec. 20, 1994 (JP 06-268411). |
European Search Report issued for corresponding European Appln. No. PCT/EP 98 12 4030, dated Jun. 27, 2002. |