JP5304272B2 - Duplexer module - Google Patents

Description

  The present invention relates to a duplexer module in which a duplexer is provided on a printed board or a multilayer board.

  A duplexer module that separates a transmission signal and a reception signal is employed in a front end unit of a mobile phone or the like. Generally, a duplexer module is mounted on a mounted device such as a printed circuit board with mounting electrodes provided on a mounting surface of the module substrate. Also, discrete components are mounted on the surface electrodes provided on the chip mounting surface of the module substrate. The mounting electrode and the surface electrode are connected by a via electrode or a pattern electrode. A transmission filter and a reception filter are provided in the transmission line and the reception line.

  A duplexer module that employs a plurality of duplexers having different target signal frequency bands may be used in a multiband front end unit (see, for example, Patent Document 1). In this duplexer module, each duplexer is configured as a discrete component in which a transmission filter and a reception filter are integrated. The discrete components of each duplexer are arranged adjacent to each other with their input ends oriented in the same direction and their output ends oriented in the same direction.

JP 2005-123909 A

  With the progress of miniaturization of the duplexer module, it has become difficult to arrange signal lines such as a transmission line through which a transmission signal passes and a reception line through which a reception signal passes with a sufficient distance therebetween. In particular, in the above-described duplexer module supporting multiband, it may be necessary to arrange the connection wirings of the discrete components of each duplexer so as to partially intersect each other. For this reason, deterioration of isolation between signal lines is likely to occur, and communication performance such as reception sensitivity is lowered due to the deterioration of isolation, which causes a problem. In particular, in the discrete component in which the transmission filter and the reception filter are integrated, the isolation between the signal lines into which the transmission filter and the reception filter are inserted progresses due to the proximity of the transmission filter and the reception filter. .

  Accordingly, an object of the present invention is to provide a duplexer module that can suppress isolation between signal lines and deterioration of communication performance.

  The present invention is a duplexer module in which a transmission line, a reception line, and an antenna line are connected, and includes a transmission filter, a reception filter, and a module substrate. The transmission line transmits a transmission signal. The reception line transmits a reception signal. The antenna line transmits a transmission signal and a reception signal. The transmission filter is inserted into the transmission line to pass the transmission signal. The reception filter is inserted into the reception line and passes the reception signal. The module substrate is formed with a transmission filter mounting terminal and a reception filter mounting terminal. The transmission filter mounting terminal includes a surface electrode for signal input to the transmission filter, a surface electrode for signal output from the transmission filter, and a ground disposed between the surface electrode for signal input and the surface electrode for signal output. A surface electrode. The reception filter mounting terminal includes a surface electrode for signal input to the reception filter, a surface electrode for signal output from the reception filter, and a ground disposed between the surface electrode for signal input and the surface electrode for signal output. A surface electrode. The main direction in which the transmission filter mounting terminal and the reception filter mounting terminal are lined up with the surface electrode for signal input, the surface electrode for ground, and the surface electrode for signal output are orthogonal to each other. The transmission filter and the reception filter are each preferably a surface acoustic wave filter provided with an IDT electrode.

  In this configuration, the transmission filter and the reception filter are each configured as separate discrete parts. Therefore, the main direction in which the surface electrode for signal input and the surface electrode for signal output are arranged in the transmission filter mounting terminal and the reception filter mounting terminal can be made different. Thereby, it becomes difficult to couple | bond a transmission filter and a reception filter, the isolation between a transmission line and a reception line can be improved, and communication performances, such as reception sensitivity, can be improved.

  A matching circuit that matches impedances of the reception filter and / or transmission filter and the antenna shared line may be provided. In this case, it is preferable to arrange the matching circuit at a position that partitions between the transmission filter mounting terminal and the reception filter mounting terminal. This makes it more difficult for the transmission filter and the reception filter to be combined.

  The module substrate includes wiring electrodes formed on the surface of the substrate and / or inside the substrate, and it is preferable that the wiring electrode serving as the transmission line and the wiring electrode serving as the reception line are arranged without overlapping in the normal direction of the substrate. . In this configuration, since both the wiring electrodes do not directly face each other with the module substrate interposed therebetween, the isolation between the transmission line and the reception line can be improved.

  The duplexer module may have a configuration including a plurality of sets of transmission lines, reception lines, and antenna sharing lines. In this case, it is preferable that one discrete component is constituted by a plurality of transmission filters provided in a plurality of transmission lines, and one discrete component is constituted by a plurality of reception filters provided in a plurality of reception lines. With this configuration, the number of discrete components to be mounted on the module substrate and the area size of the module substrate can be suppressed, so that the manufacturing cost can be reduced, the manufacturing process can be simplified, and the module substrate can be downsized.

  A switch may be provided between the transmission line, the reception line, and the antenna shared line, and the switch, the transmission filter, and the reception filter may be connected by an antenna switching line. As a result, the duplexer module is caused to function as a switch multiplexer.

  According to the present invention, the transmission filter and the reception filter are coupled to each other by changing the main direction in which the surface electrode for signal input and the surface electrode for signal output are arranged in the transmission filter mounting terminal and the reception filter mounting terminal. It becomes difficult to do. Therefore, it is possible to improve isolation between the transmission line and the reception line and improve communication performance such as reception sensitivity. As a result, the duplexer module can be reduced in size while suppressing deterioration in communication performance.

It is a figure explaining the structural example of the duplexer module which concerns on the 1st Embodiment of this invention. It is a figure explaining the structural example of the duplexer module which concerns on the 2nd Embodiment of this invention. It is a figure explaining the structural example of the duplexer module which concerns on other embodiment of this invention.

  FIG. 1 is a diagram illustrating a configuration example of a duplexer module according to the first embodiment of the present invention.

  FIG. 1A is a schematic equivalent circuit diagram of the duplexer module 1. The duplexer module 1 includes an antenna shared line 3, a reception line 4, a transmission line 5, a transmission filter Tx, a reception filter Rx, and a matching circuit 6.

  The antenna common line 3, the reception line 4 and the transmission line 5 are connected by a matching circuit 6. The matching circuit 6 includes a phase adjustment line on the transmission side and a phase adjustment line on the reception side, and performs impedance matching between the lines. The antenna sharing line 3 is an antenna line according to the present invention and includes an antenna port ANT as an external connection port, and transmits a transmission signal and a reception signal. The reception line 4 includes a reception port RX as an external connection port, and transmits a reception signal. The transmission line 5 includes a transmission port TX as an external connection port, and transmits a transmission signal. The transmission filter Tx is inserted in the transmission line 5 and passes a transmission signal of a predetermined frequency band. The reception filter Rx is inserted in the reception line 4 and passes a reception signal in a predetermined frequency band.

  FIG. 1B is a top view of the duplexer module 1. The duplexer module 1 includes a multilayer substrate 2 corresponding to the module substrate of the present invention. The multilayer substrate 2 is formed by laminating a plurality of substrates such as ceramic or resin. The bottom surface of the multilayer substrate 2 (not shown) is a module mounting surface, and includes a plurality of mounting electrodes that serve as external connection ports of the duplexer module 1. The top surface of the multilayer substrate 2 shown in the figure includes a surface electrode on which discrete components are mounted. Between the surface electrodes or between the surface electrode and the mounting electrode, pattern electrodes and via electrodes provided in the multilayer substrate 2 are connected.

  The duplexer module 1 is provided with a pattern electrode serving as a matching circuit 6 at a position sandwiched between the transmission filter Tx and the reception filter Rx when viewed from the normal direction of the substrate. By arranging the matching circuit 6 at a position that partitions between the transmission filter Tx and the reception filter Rx in this manner, the reception filter Rx and the transmission filter Tx are difficult to be coupled to each other. Isolation between them is improved.

  The transmission filter Tx and the reception filter Rx are discrete parts of a surface acoustic wave filter provided with IDT electrodes, respectively, and the bottom surfaces formed on the discrete parts on the filter mounting terminals 7 and 8 provided on the top surface of the multilayer substrate 2. Terminals are mounted with solder. Here, the transmission filter Tx is an unbalanced input-unbalanced output type, and the reception filter Rx is an unbalanced input-balanced output type. The filter mounting terminal 7 includes a surface electrode RXin, a surface electrode RXout, and a surface electrode GND. The surface electrode RXin is a surface electrode for inputting a reception signal to the reception filter Rx. The surface electrode RXout is a surface electrode for balanced output of a reception signal from the reception filter Rx. The surface electrode GND is a surface electrode for connection to the ground potential. The filter mounting terminal 8 includes a surface electrode TXin, a surface electrode TXout, and a surface electrode GND. The surface electrode TXin is a surface electrode for inputting a transmission signal to the transmission filter Tx. The surface electrode TXout is a surface electrode for outputting a transmission signal from the transmission filter Tx. The surface electrode GND is a surface electrode for connection to the ground potential.

  Each of the filter mounting terminals 7 and 8 has a plurality of surface electrodes arranged symmetrically. Here, the direction (indicated by an arrow in the figure) from the surface electrode for signal input to the surface electrode for signal output along the center line of the filter housing serving as the axis of symmetry is defined as the main direction of the filter mounting terminal. Put it on. According to this definition, the filter mounting terminal 7 is arranged so that the main direction faces leftward in the figure, and the filter mounting terminal 8 is arranged so that the main direction faces upward in the figure. Thus, the filter mounting terminals 7 and 8 are arranged so that their main directions are orthogonal to each other. With this arrangement, the reception filter Rx and the transmission filter Tx have two filters or two sets of input / output surface electrodes whose orthogonal directions are orthogonal to each other, making it difficult for transmission / reception signals to be coupled to each other. Isolation with the reception line 4 is improved.

  Note that the transmission filter and the reception filter may be arranged at angles other than orthogonal. Even if it does in this way, the coupling | bonding of both filters can be suppressed rather than the case where it arrange | positions so that the main directions of both filters may correspond.

  Moreover, you may comprise so that another circuit element may be inserted in a transmission line or a receiving line. Even in such a case, the present invention can be suitably implemented by configuring the transmission filter and the reception filter as separate discrete parts and disposing the main directions different from each other.

  FIG. 2 is a diagram illustrating a configuration example of a duplexer module according to the second embodiment of the present invention. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The duplexer module 11 of the present embodiment constitutes a dual-band duplexer module that shares an antenna port ANT in two communication systems having different target frequency bands.

  FIG. 2A is a schematic equivalent circuit diagram of the duplexer module 11. The duplexer module 11 includes antenna switching lines 3A and 3B, an antenna sharing line 3C, reception lines 4A and 4B, transmission lines 5A and 5B, a switch SW, and two duplexers DHU. The antenna shared line 3C and the antenna switching lines 3A and 3B are antenna lines of the present invention and are connected by a switch SW. The switch SW selects one of the antenna switching lines 3A and 3B and connects it to the antenna sharing line 3C. The antenna sharing line 3C includes an antenna port ANT as an external connection port. The duplexer DHU includes a transmission filter and a reception filter. The duplexer DHU separates a transmission signal and a reception signal of a target communication system into reception lines 4A and 4B and transmission lines 5A and 5B.

  FIG. 2B is a top view of the duplexer module 11. Here, the transmission filters in the two duplexers DHU are configured as a transmission filter chip 2Tx which is an integral discrete component. In addition, the reception filter in the two duplexers DHU is configured as a reception filter chip 2Rx which is an integral discrete component.

  The transmission filter chip 2Tx and the reception filter chip 2Rx are surface acoustic wave filters each provided with an IDT electrode, and are bottom terminal terminals formed on discrete components on the filter mounting terminals 17 and 18 provided on the top surface of the multilayer substrate 2. Is mounted with solder or the like. Here, the transmission filter chip 2Tx and the reception filter chip 2Rx are of an unbalanced input-unbalanced output type. Further, the plurality of surface electrodes of the filter mounting terminals 17 and 18 are arranged symmetrically with respect to each other, the filter mounting terminal 17 is arranged so that the main direction is directed leftward in the figure, and the filter mounting terminal 18 faces upward in the figure. Arranged so that the main direction is facing. In this way, the filter mounting terminals 17 and 18 are arranged so that their main directions are orthogonal to each other. This arrangement makes it difficult for the transmission filter chip 2Tx and the reception filter chip 2Rx mounted on the filter mounting terminals 17 and 18 to be coupled to each other, and the isolation between the transmission line and the reception line is improved.

  FIG. 3 is a diagram illustrating a configuration example of a duplexer module according to another embodiment of the present invention.

  FIG. 3A is a schematic top view of the duplexer module 21. The duplexer module 21 constitutes a diplexer-type duplexer module in which duplexers in two communication systems having different target frequency bands are integrated.

  The duplexer module 21 includes antenna sharing lines 3A and 3B, reception lines 4A and 4B, transmission lines 5A and 5B, two power amplifiers PA, two couplers CPL, two transmission filters Tx, a switch SW, and two reception filters Rx. Is provided. The antenna sharing lines 3A and 3B, the reception lines 4A and 4B, and the transmission lines 5A and 5B are connected by a switch SW. The switch SW is a discrete component, and selects one of the reception lines 4A and 4B and one of the transmission lines 5A and 5B and connects it to the antenna sharing lines 3A and 3B. The antenna shared lines 3A and 3B constitute a balanced input / output type antenna port ANT as an external connection port. The transmission lines 5A and 5B include a transmission port TX as an external connection port. The reception lines 4A and 4B include a balanced output type reception port RX as an external connection port.

  The power amplifier PA is a discrete component inserted in the transmission lines 5A and 5B, and amplifies the transmission signal. The coupler CPL is a discrete component inserted in the transmission lines 5A and 5B, and outputs a part of the power of the transmission signal to a monitor terminal (not shown). The transmission filter Tx is a discrete component inserted in the transmission lines 5A and 5B, and allows transmission signals in a predetermined frequency band to pass through. The reception filter Rx is a discrete component inserted in the reception lines 4A and 4B, and allows a reception signal in a predetermined frequency band to pass therethrough.

  Here, the two transmission filters Tx and the two reception filters Rx are surface acoustic wave filters provided with IDT electrodes, respectively, and are equipped with filter mounting terminals 27A, 27B, 28A, provided on the top surface of the multilayer substrate 2. A bottom terminal formed on the discrete component is mounted on 28B with solder or the like. Here, the plurality of surface electrodes of the filter mounting terminals 27A, 27B, 28A, and 28B are arranged symmetrically with respect to each other, and the filter mounting terminals 27A and 27B on which the transmission filter Tx is mounted are arranged so that the main direction faces rightward in the figure. The filter mounting terminals 28A and 28B on which the reception filter Rx is mounted are arranged so that the main direction faces downward in the figure. The filter mounting terminals 27A and 27B and the filter mounting terminals 28A and 28B are arranged so that their main directions are orthogonal to each other. With this arrangement, it is difficult for the reception filter Rx and the transmission filter Tx to be coupled to each other, and the isolation between the transmission line and the reception line is improved.

  FIG. 3B is a schematic top view of the duplexer module 31.

  The duplexer module 31 constitutes a diplexer-type duplexer module in which the duplexers in two communication systems having different target frequency bands are integrated.

  The duplexer module 31 includes antenna sharing lines 3A and 3B, reception lines 4A and 4B, transmission lines 5A and 5B, two power amplifiers PA, two couplers CPL, a transmission filter chip 2Tx, a switch SW, and a reception filter chip 2Rx. . Here, the transmission filter chip 2Tx is a discrete component in which two transmission filters inserted into the transmission lines 5A and 5B are integrated, and transmits a transmission signal. The reception filter chip 2Rx is a discrete part in which two reception filters inserted in the reception lines 4A and 4B are integrated, and allows a reception signal to pass therethrough.

  Here, the transmission filter chip 2Tx and the reception filter chip 2Rx are surface acoustic wave filters each provided with an IDT electrode, and are connected to the filter mounting terminals 37 and 38 provided on the top surface of the multilayer substrate 2 as discrete components. The formed bottom terminal is mounted with solder or the like. Here, the plurality of surface electrodes of the filter mounting terminals 37 and 38 are arranged symmetrically with respect to each other, and the filter mounting terminal 37 on which the transmission filter chip 2Tx is mounted is arranged so that the main direction is directed to the right in the figure. The filter mounting terminal 38 on which the filter chip 2Rx is mounted is arranged so that the main direction faces downward in the figure. The filter mounting terminal 37 and the filter mounting terminal 38 are arranged so that their main directions are orthogonal to each other. Such an arrangement makes it difficult for the reception filter chip 2Rx and the transmission filter chip 2Tx to be coupled to each other, improving isolation between the transmission line and the reception line.

  In the duplexer modules 21 and 31, any two signal lines are arranged so as not to intersect when viewed from the normal direction of the substrate. Thereby, the isolation between the transmission line 5 and the reception line 4 is improved.

  The present invention can be applied to circuits other than the circuit configurations and electrode configurations shown in the above-described embodiments, and at least a transmission filter and a reception filter are arranged on filter mounting terminals having different main directions to constitute a duplexer. If so, the isolation can be improved.

DESCRIPTION OF SYMBOLS 1,11,21,31 ... Duplexer module 2 ... Multilayer board 3 ... Antenna common line 3A, 3B ... Antenna switching line 3C ... Antenna common line 4, 4A, 4B ... Reception line 5, 5A, 5B ... Transmission line 6 ... Matching Circuit 7, 8, 17, 18, 27A, 27B, 28A, 28B, 37, 38 ... Filter mounting terminals
CPL ... coupler
DHU ... Duplexer
PA ... Power amplifier
SW ... Switch
Rx: Receive filter
Tx: Transmission filter
2Rx: Receive filter chip
2Tx: Transmit filter chip
ANT ... antenna port
RX: Receive port
TX ... Transmission port

Claims (6)

A duplexer module connecting a transmission line for transmitting a transmission signal, a reception line for transmitting a reception signal, and an antenna line for transmitting the transmission signal and the reception signal;
A transmission filter inserted into the transmission line and passing the transmission signal;
A reception filter that is inserted into the reception line and passes the reception signal;
The surface electrode of the signal input to the transmission filter, the surface electrode of the signal output from the transmission filter, and for grounding which is disposed between the surface electrode for the surface electrode signal output for the signal input a transmitting filter mounting pin comprising a surface electrode, a surface electrode of the signal input to the receiving filter, a surface electrode, and surface electrode and the surface electrode for the signal output for the signal input of the signal output from the receiving filter a module substrate on which the reception filter mounting terminals, are formed with a surface electrode of the deployed ground between,
With
The transmission filter mounting terminal and the reception filter mounting terminal are duplexer modules in which main directions in which the surface electrode for signal input, the surface electrode for ground, and the surface electrode for signal output are arranged are orthogonal to each other. The duplexer module according to claim 1, wherein each of the transmission filter and the reception filter is a surface acoustic wave filter provided with an IDT electrode . A matching circuit for matching impedance between the reception filter and / or the transmission filter and the antenna line;
The duplexer module according to claim 1, wherein the matching circuit is disposed at a position that partitions between the transmission filter mounting terminal and the reception filter mounting terminal.   The module substrate includes a wiring electrode formed on the substrate surface and / or inside the substrate, and the wiring electrode to be the transmission line and the wiring electrode to be the reception line are arranged without overlapping in the normal direction of the substrate, The duplexer module according to claim 1. A duplexer module comprising a plurality of sets of the transmission line, the reception line, and the antenna line,
A plurality of transmission filters provided in a plurality of transmission lines constitute one discrete component, and a plurality of reception filters provided in a plurality of reception lines constitute one discrete component. The duplexer module according to any one of the above.   The switch according to any one of claims 1 to 5, further comprising a switch between the transmission line, the reception line, and the antenna line, wherein the switch, the transmission filter, and the reception filter are connected by an antenna switching line. The duplexer module described.

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