Abstract:
A duplexer device having a plurality of duplexers mounted on a substrate for mounting a duplexer includes: a substrate for mounting a duplexer, the substrate having a rectangular shape including a first side, a second side neighboring the first side and connected to the first side, a third side facing the second side and neighboring the first side, and a fourth side connected to the second and the third sides and facing the first side, and a plurality of pads being formed on a surface of the substrate; a first duplexer mounted on the substrate for mounting a duplexer and including a first antenna, terminal, a first transmission terminal and a first reception terminal; and a second duplexer mounted on the substrate for mounting a duplexer and including a second antenna terminal, a second transmission terminal and a second reception terminal.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    The present application claims the benefit of Korean Patent Application No. 10-2015-0156382, filed in the Korean Intellectual Property Office on Nov. 9, 2015, the entire content of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a duplexer device and a substrate for mounting a duplexer. 
         [0004]    2. Description of the Related Art 
         [0005]    A duplexer including a SAW (SAW) device is mounted on a communication device, such as a handheld terminal, in order to electrically separate the transmission path and reception path of an antenna. 
         [0006]    Recently, a technology in which a plurality of duplexers having different transmission and reception bands is mounted on a communication device in order to handle a plurality of bands having different frequency bands and a duplexer according to a corresponding band is switched by a switch comes on the stage. 
         [0007]    Patent Document 1 discloses a module including a dual duplexer having two SAW filters. The disclosed module includes the input side and the output side, and has an antenna and a switch disposed on the input side and a reception-side switch and a transmission-side switch disposed on the output side. 
       PRIOR ART DOCUMENT 
     Patent Document 
       [0008]    (Patent Document 1) Japanese Patent Application Publication No. 2003-51723 
       SUMMARY OF THE INVENTION 
       [0009]    If a dual duplexer is modulated, it is considered that an isolation characteristic between the two duplexers is inevitably deteriorated. Accordingly, there is a possibility that an excellent isolation characteristic may not be obtained in the module of Patent Document 1. 
         [0010]    However, Patent Document 1 does not mention any problem in the configured module. In particular, Patent Document 1 does not take into consideration a problem if the antenna (ANT) terminal, reception (Rx) terminal and transmission (Tx) terminal of the two SAW filters are disposed. 
         [0011]    In accordance with the research and experiments of the inventors, in a modulated dual duplexer device, it has been determined that an isolation characteristic is greatly changed depending on the deployment of the ANT terminal, Tx terminal and Rx terminal of a SAW filter that forms each duplexer. 
         [0012]    An object of the present invention is to provide a duplexer device capable of easily obtaining an excellent isolation characteristic and a substrate for mounting a duplexer. 
         [0013]    A duplexer device according to an aspect of the present invention includes a substrate for mounting a duplexer, the substrate having a rectangular shape including a first side, a second side neighboring the first side and connected to the first side, a third side facing the second side and neighboring the first side, and a fourth side connected to the second and the third sides and facing the first side, and a plurality of pads being formed on a surface of the substrate; a first duplexer configured to be mounted on the substrate for mounting a duplexer and to include a first antenna terminal, a first transmission terminal and a first reception terminal; and a second duplexer configured to be mounted on the substrate for mounting a duplexer and to include a second antenna terminal, a second transmission terminal and a second reception terminal. The first antenna terminal and the second antenna terminal are electrically connected to pads for an antenna, respectively, which belong to the plurality of pads and are disposed along the first side. The first reception terminal and the second reception terminal are electrically connected to pads for reception, respectively, which belong to the plurality of pads and are disposed along the second side. The first transmission terminal and the second transmission terminal are electrically connected to pads for transmission, respectively, which belong to the plurality of pads and are disposed along the third side. 
         [0014]    A substrate for mounting a duplexer according to another aspect of the present invention includes a rectangular substrate including a first side, a second side neighboring the first side and connected to the first side, a third side facing the second side and neighboring the first side, and a fourth side connected to the second and the third sides and facing the first side, for mounting a plurality of duplexers; a plurality of pads for antennas which is adjacent to the first side and connected to antennas of the plurality of duplexers disposed along the first side; a plurality of pads for reception which is adjacent to the second side and connected to reception terminals of the plurality of duplexers disposed along the second side; a plurality of pads for transmission which is adjacent to the third side and connected to transmission terminals of the plurality of duplexers disposed along the third side; and a ground pad for grounding the plurality of duplexers disposed in a central part of the rectangular substrate. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]      FIG. 1  is a block diagram showing the configuration of a duplexer device related to an embodiment of the present invention. 
           [0016]      FIG. 2  is a block diagram showing the configuration of the duplexer related to an embodiment of the present invention. 
           [0017]      FIG. 3  is a schematic diagram showing the configuration of a substrate for mounting a duplexer, which is related to an embodiment of the present invention. 
           [0018]      FIG. 4A  is a cross-sectional view of the substrate for mounting a duplexer, which is related to an embodiment of the present invention. 
           [0019]      FIG. 4B  is a schematic diagram showing the pattern of wires of the substrate for mounting a duplexer, which is related to an embodiment of the present invention. 
           [0020]      FIG. 4C  is a schematic diagram showing a modified example of the pattern of wires of the substrate for mounting a duplexer, which is related to an embodiment of the present invention. 
           [0021]      FIG. 5  is a schematic diagram showing the configuration of a duplexer device related to an embodiment of the present invention. 
           [0022]      FIG. 6A  is a graph showing a frequency characteristic on the transmission side of a first duplexer. 
           [0023]      FIG. 6B  is a graph showing a frequency characteristic on the reception side of the first duplexer. 
           [0024]      FIG. 6C  is a graph showing the isolation characteristic of the first duplexer. 
           [0025]      FIG. 7A  is a graph showing a frequency characteristic on the transmission side of a second duplexer. 
           [0026]      FIG. 7B  is a graph showing a frequency characteristic on the reception side of the second duplexer. 
           [0027]      FIG. 7C  is a graph showing the isolation characteristic of the second duplexer. 
       
    
    
     DESCRIPTION OF REFERENCE NUMERALS 
       [0028]      10 : duplexer device  11 : first duplexer 
         [0029]      12 : second duplexer 
         [0030]      61   a,    61   b : first frequency characteristic 
         [0031]      62   a,    62   b : second frequency characteristic 
         [0032]      63 : first isolation characteristic 
         [0033]      64 : second isolation characteristic 
         [0034]      71   a,    71   b : third frequency characteristic 
         [0035]      72   a,    72   b:  fourth frequency characteristic 
         [0036]      73 : third isolation characteristic 
         [0037]      74 : fourth isolation characteristic 
         [0038]      100 : substrate for mounting a duplexer 
         [0039]      101   a,    101   b,    101   c,    101   d,    101   e,    101   f,    101   g,    101   h,    101   i,    101   j,    101   k,    101   l,    101   m:  pad 
         [0040]      111 : first Rx filter  112 : first Tx filter 
         [0041]      113 : first ANT terminal  114 : first Rx terminal 
         [0042]      115 : first Tx terminal  121 : second Rx filter 
         [0043]      122 : second Tx filter  123 : second ANT terminal 
         [0044]      124 : second Rx terminal  125 : second Tx terminal 
         [0045]      200 : first layer  300 : second layer 
         [0046]      310 ,  310 ′: first reception-side ground wire 
         [0047]      320 ,  320 ′: second reception-side ground wire 
         [0048]      400 : third layer 
         [0049]      410 ,  410 ′: third reception-side ground wire 
         [0050]      420 ,  420 ′: fourth reception-side ground wire 
         [0051]      430 ,  430 ′: first transmission-side ground wire 
         [0052]      440 ,  440 ′: second transmission-side ground wire 
       DETAILED DESCRIPTION 
       [0053]    Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. Furthermore, in order to avoid inconvenience attributable to a redundant description, the same reference numeral is assigned to the same part or an equivalent thereof in each figure and a description thereof is omitted. 
       Embodiment 
       [0054]      FIG. 1  is a block diagram showing the configuration of a duplexer device  10  related to an embodiment of the present invention. 
         [0055]    As shown in  FIG. 1 , the duplexer device  10  includes a first duplexer  11 , a second duplexer  12  and a substrate  100  for mounting a duplexer. The duplexer device  10  is configured by mounting the first duplexer  11  and the second duplexer  12  on the substrate  100  for mounting a duplexer. 
       Configuration of First Duplexer  11   
       [0056]      FIG. 2  is a block diagram showing the configuration of the first duplexer  11  and the second duplexer  12 . 
         [0057]    As shown in  FIG. 2 , the first duplexer  11  includes a first Rx filter  111 , a first Tx filter  112 , a first ANT terminal  113 , a first Rx terminal  114  and a first Tx terminal  115 . 
         [0058]    The first Rx filter  111  is a filter that pass a first reception band. In general, the first Rx filter  111  may be configured by a double mode type SAW device, but is not limited thereto. The first reception band is not especially limited and may be properly designed depending on a required band. 
         [0059]    The first Tx filter  112  is a filter that pass a first transmission band. In general, the first Tx filter  112  may be configured by a ladder type SAW device, but is not limited thereto. The first transmission band is not especially limited and may be properly designed depending on a required band. 
         [0060]    The first ANT terminal  113  is a terminal connected to the antenna of a communication device, the first Rx filter  111  and the first Tx filter  112 . 
         [0061]    The first Rx terminal  114  is a terminal connected to the first Rx filter  111 . That is, the first Rx terminal  114  is connected to the first ANT terminal  113  with the first Rx filter  111  interposed between them. 
         [0062]    The first Tx terminal  115  is a terminal connected to the first Tx filter  112 . That is, the first Tx terminal  115  is connected to the first ANT terminal  113  with the first Tx filter  112  interposed between them. 
       Configuration of Second Duplexer  12   
       [0063]    The second duplexer  12  includes a second Rx filter  121 , a second Tx filter  122 , a second ANT terminal  123 , a second Rx terminal  124  and a second Tx terminal  125 . 
         [0064]    The second Rx filter  121  is a filter that pass a second reception band. In general, the second Rx filter  121  may be configured by a double mode type SAW device, but is not limited thereto. Like the first reception band, the second reception band is not especially limited and may be properly designed depending on a required band. Furthermore, the second reception band may be the same as or different from the first reception band. 
         [0065]    The second Tx filter  122  is a filter that pass a second transmission band. In general, the second Tx filter  122  may be configured by a ladder type SAW device, but is not limited thereto. Like the first transmission band, the second transmission band is not especially limited and may be properly designed depending on a required band. Furthermore, the second transmission band may be the same as or different from the first transmission band. 
         [0066]    The second ANT terminal  123  is a terminal connected to the antenna of a communication device, the second Rx filter  121  and the second Tx filter  122 . 
         [0067]    The second Rx terminal  124  is a terminal connected to the second Rx filter  121 . That is, the second Rx terminal  124  is connected to the second ANT terminal  123  with the second Rx filter  121  interposed between them. 
         [0068]    The second Tx terminal  125  is a terminal connected to the second Tx filter  122 . That is, the second Tx terminal  125  is connected to the second ANT terminal  123  with the second Tx filter  122  interposed between them. 
       Configuration of Substrate  100  for Mounting Duplexer 
       [0069]      FIG. 3  is a schematic diagram showing an example of a detailed configuration of the substrate  100  for mounting a duplexer, which is related to an embodiment of the present invention. 
         [0070]    As shown in  FIG. 3 , the substrate  100  for mounting a duplexer is a rectangular substrate including a first side  110 , a second side  120 , a third side  130  and a fourth side  140 . 
         [0071]    The second side  120  is a side connected to the first side  110 . The third side  130  is a side that is connected to the first side  110  and that faces the second side  120 . The fourth side  140  is a side that is connected to the second side  120  and the third side  130  and that faces the first side  110 . Furthermore, a plurality of pads has been disposed on a surface of the substrate  100  for mounting a duplexer. 
         [0072]    The pads include a transmission pad for supplying output from a power amplifier (not shown) to the first Tx terminal  115  and second Tx terminal  125  of the first duplexer  11  and the second duplexer  12 . Furthermore, the pads include a reception pad for supplying a linear amplifier (not shown) with reception output applied to the first Rx terminal  114  and second Rx terminal  124  of the first duplexer  11  and the second duplexer  12 . Furthermore, the pads include an antenna pad connected to the first ANT terminal  113  and the second ANT terminal  123 . 
         [0073]    Specifically, a pad  101   a,  a pad  101   j,  a pad  101   k  and a pad  101   l  have been disposed on a surface of the substrate  100  for mounting a duplexer along the first side  110 . Furthermore, a pad  101   b,  a pad  101   c  and a pad  101   d  have been disposed on the surface of the substrate  100  along the second side  120  connected to the first side  110 . Furthermore, a pad  101   g,  a pad  101   h  and a pad  101   i  have been disposed on the surface of the substrate  100  along the third side  130  that is connected to the first side  110  and that faces the second side  120 . Furthermore, a pad  101   e  and a pad  101   f  have been disposed on the surface of the substrate  100  along the fourth side  140  that faces the first side  110  and that is connected to the second side  120  and the third side  130 . Furthermore, a pad  101   m  has been disposed at the center of the surface of the substrate  100 . That is, the 13 pads have been disposed on the surface of the illustrated substrate  100  for mounting a duplexer. The substrate  100  for mounting a duplexer illustrated in  FIG. 3  is illustrative, and the number of pads may be randomly changed depending on the design. 
         [0074]    The pads  101   a  to  101   m  disposed on the surface of the substrate  100  for mounting a duplexer are described in more detail below. 
         [0075]    The pad  101   a,  the pad  101   j,  the pad  101   k  and the pad  101   l  disposed along the first side  110  are pads for an ANT terminal to which the first ANT terminal  113  and the second ANT terminal  123  are connected. That is, the pads for an ANT terminal are disposed along the same side. Furthermore, a pad that belongs to the pad  101   a,  the pad  101   j,  the pad  101   k  and the pad  101   l  and that is not connected to the first ANT terminal  113  and the second ANT terminal  123  is a pad for ground. 
         [0076]    The pad  101   b,  the pad  101   c  and the pad  101   d  disposed along the second side  120  are pads for an Rx terminal to which the first Rx terminal  114  and the second Rx terminal  124  are connected. That is, the pads for an Rx terminal are disposed independently of a pad for reception and a pad for an antenna along the same side. Furthermore, a pad that belongs to the pad  101   b,  the pad  101   c  and the pad  101   d  and that is not connected to the first Rx terminal  114  and the second Rx terminal  124  is a pad for ground. 
         [0077]    The pad  101   g,  the pad  101   h  and the pad  101   i  disposed along the third side  130  are pads for a Tx terminal to which the first Tx terminal  115  and the second Tx terminal  125  are connected. That is, the pads for a Tx terminal are disposed along a side different from that of the pad for reception and the pad for an antenna and also disposed along the same side. Furthermore, a pad that belongs to the pad  101   g,  the pad  101   h  and the pad  101   i  and that is not connected to the first Tx terminal  115  and the second Tx terminal  125  is a pad for ground. 
         [0078]    The pad  101   e  and the pad  101   f  disposed along the fourth side  140  are pads for ground. 
         [0079]      FIG. 4A  is a schematic diagram of a cross section of the substrate  100  for mounting a duplexer. 
         [0080]    As shown in  FIG. 4A , the substrate  100  for mounting a duplexer includes a first layer  200 , a second layer  300  and a third layer  400 . The substrate  100  for mounting a duplexer has been illustrated as including the three layers hereinafter, but is illustrative and is not limited thereto. 
         [0081]      FIG. 4B  is a schematic diagram of the first layer  200 , the second layer  300  and the third layer  400 , which is seen from the top. A dark circle shown in  FIG. 4B  indicates a via hole, and the first layer  200 , the second layer  300  and the third layer  400  are connected via the via holes. 
         [0082]    The first layer  200  is a layer forming the pads disposed on the surface of the substrate  100  for mounting a duplexer. That is, the first layer  200  corresponds to the surface of the substrate  100  for mounting a duplexer in  FIG. 3  and shows the pads  101   a  to  101   m.    
         [0083]    The second layer  300  diagramatically shows the pattern of the pad for an antenna, the pad for transmission, the pad for reception, and ground wires. The illustrated second layer  300  includes a first reception-side ground wire  310  and a second reception-side ground wire  320 . Furthermore, via holes connected to the respective pads  101   g  to  101   j  on the transmission side of the first layer  200  are formed on the transmission side of the second layer  300 . Meanwhile, via holes connected to the respective pads  101   c  and  101   d  on the reception side of the first layer  200  are formed on the reception side of the second layer  300 . The via holes are disposed closer to the fourth side  140  than to the center of the second side  120  of the substrate  100  for mounting a duplexer. 
         [0084]    The first reception-side ground wire  310  of the second layer  200  is a ground wire connected to a ground on the reception side of the first duplexer  11 . Furthermore, the pad  101   a,  the pad  101   b  and the pad  101   m  are connected to the first reception-side ground wire  310 . That is, in the second layer  300 , the pad  101   a,  the pad  101   b  and the pad  101   m  are grounds on the reception side of the first duplexer  11 . 
         [0085]    The second reception-side ground wire  320  is a ground wire connected to a ground on the reception side of the second duplexer  12 . Furthermore, the pad  101   e,  the pad  101   f  and the pad  101   m  are connected to the second reception-side ground wire  320 . That is, in the second layer  300 , the pad  101   e,  the pad  101   f  and the pad  101   m  are grounds on the reception side of the second duplexer  12 . 
         [0086]    As shown in  FIG. 4B , the first reception-side ground wire  310  and the second reception-side ground wire  320  are not connected, but have been independently disposed. Furthermore, in the second layer  300 , the pattern and the via hole corresponding to the pad  101   c  for reception of the first duplexer  11  and the pad  101   d  for reception of the second duplexer  12  are independent are disposed closer to the fourth side  140  than to the center of the second side  120 . 
         [0087]    Like the second layer  300 , the third layer  400  shows the pattern of wires corresponding to a pad for an antenna, a pad for transmission, a pad for reception and ground pads. The third layer  400  includes a third reception-side ground wire  410 , a fourth reception-side ground wire  420 , a first transmission-side ground wire  430  and a second transmission-side ground wire  440 . The pads are connected to the ground wires  410  to  440  with via holes interposed therebetween as grounds for reception and transmission. 
         [0088]    Specifically, the third reception-side ground wire  410  is a ground wire to which a ground pad on the reception side of the first duplexer  11  is connected. Furthermore, the pad  101   a,  the pad  101   b  and the pad  101   m  are connected to the third reception-side ground wire  410  with via holes interposed therebetween. That is, the third reception-side ground wire  410  of the third layer  400  is a ground wire on the reception side, which is connected to the pad  101   a,  the pad  101   b  and the pad  101   m.    
         [0089]    The fourth reception-side ground wire  420  is a ground wire to which a ground on the reception side of the second duplexer  12  is connected. Furthermore, the fourth reception-side ground wire  420  is connected to the pad  101   e  and the pad  101   m  with via holes interposed therebetween. That is, in the third layer  400 , the pad  101   e  and the pad  101   m  form ground pads on the reception side of the second duplexer  12 . 
         [0090]    As shown in  FIG. 4B , the third reception-side ground wire  410  and the fourth reception-side ground wire  420  are not connected, but have been independently disposed. That is, the grounds on the reception side of the first duplexer  11  and the second duplexer  12  are independent in the third layer  400  in addition to the second layer  300 . 
         [0091]    The first transmission-side ground wire  430  is a ground wire to which a ground on the transmission side of the first duplexer  11  is connected. Furthermore, the pad  101   j  is connected to the first transmission-side ground wire  430  with a via hole interposed therebetween. That is, in the first transmission-side ground wire  430 , the pad  101   j  is a ground on the transmission side of the first duplexer  11 . 
         [0092]    The second transmission-side ground wire  440  is a ground wire to which a ground on the transmission side of the second duplexer  12  is connected. Furthermore, the pad  101   h  is connected to the second transmission-side ground wire  440  with a via hole interposed therebetween. That is, in the second transmission-side ground wire  440 , the pad  101   h  is a ground on the transmission side of the second duplexer  12 . 
         [0093]    As shown in  FIG. 4B , the first transmission-side ground wire  430  and the second transmission-side ground wire  440  are not connected, but have been independently disposed. That is, in the third layer  400 , the grounds on the transmission side of the first duplexer  11  and second duplexer  12  are independent. Accordingly, in the duplexer device  10 , the grounds of the first duplexer  11  and the second duplexer  12  are independent. 
         [0094]    From the above description, the pad  101   l  and the pad  101   k  that belong to the pads disposed along the first side  110  and that are not connected to a ground are pads for an antenna to which the first ANT terminal  113  and the second ANT terminal  123  are connected. 
         [0095]    The pad  101   c  and the pad  101   d  that belong to the pads disposed along the second side  120  and that are not connected to a ground are pads for reception to which the first Rx terminal  114  and the second Rx terminal  124  are connected. 
         [0096]    The pad  101   i  and the pad  101   g  that belong to the pads disposed along the third side  130  and that are not connected to a ground are pads for transmission to which the first Tx terminal  115  and the second Tx terminal  125  are connected. 
         [0097]    In the substrate  100  for mounting a duplexer, the pad for an antenna and the pad for reception are not connected, but are connected within the first duplexer  11  and the second duplexer  12  mounted on the substrate  100  for mounting a duplexer. Likewise, the pad for an antenna and the pad for transmission are not connected, but are connected within the first duplexer  11  and the second duplexer  12  mounted on the substrate  100  for mounting a duplexer. 
         [0098]    Furthermore, the pattern of the pad for an antenna, the pad for transmission, the pad for reception and the ground wires shown in  FIG. 4B  are illustrative, and each pattern may be randomly changed depending on the design. 
         [0099]      FIG. 4C  shows a substrate for mounting a duplexer related to another embodiment of the present invention. Only a second layer  300 ′ and third layer  400 ′ are diagramatically shown in  FIG. 4C . 
         [0100]    The second layer  300 ′ is a modified example of the second layer  300 , and includes a first reception-side ground wire  310 ′ and a second reception-side ground wire  320 ′. Furthermore, the second layer  300 ′ and the third layer  400 ′ shown in  FIG. 4C  are only modified examples of the second layer  300  and the third layer  400  and do not limit a modification example of the present invention. 
         [0101]    As shown in  FIG. 4C , the first reception-side ground wire  310 ′ is connected to the second reception-side ground wire  320 ′. Accordingly, in the second layer  300 ′, the pad  101   a,  the pad  101   b,  the pad  101   e,  the pad  101   f  and the pad  101   m  are common. That is, in the second layer  300 ′, grounds on the reception side of the first duplexer  11  and the second duplexer  12  are common. 
         [0102]    The third layer  400 ′ is a modified example of the third layer  400 , and includes a third reception-side ground wire  410 ′, a fourth reception-side ground wire  420 ′, a first transmission-side ground wire  430 ′ and a second transmission-side ground wire  440 ′. 
         [0103]    As shown in  FIG. 4C , the third reception-side ground wire  410 ′ is connected to the fourth reception-side ground wire  420 ′. Accordingly, in the third layer  400 ′, the pad  101   a,  the pad  101   b,  the pad  101   e  and the pad  101   m  are common. That is, grounds on the reception side of the first duplexer  11  and the second duplexer  12  are common in the third layer  400 ′ in addition to the second layer  300 ′. 
         [0104]    The first transmission-side ground wire  430 ′ and the second transmission-side ground wire  440 ′ are the same as the first transmission-side ground wire  430  and the second transmission-side ground wire  440 . Furthermore, in  FIG. 4C , the pattern of a pad for an antenna, a pad for transmission and a pad for reception is the same as that of  FIG. 4B . In particular, the pad for reception disposed along the second side  120  of the substrate for mounting a duplexer is disposed closer to the fourth side  140  than to the center of the second side  120 . As described above, the pad for reception is disposed along one side of the substrate for mounting a duplexer and is spaced apart from the first side  110  on which the pad for antenna is disposed. Accordingly, it was found that an isolation characteristic between the first duplexer  11  and the second duplexer  12  could be improved. 
         [0105]    Furthermore, in an embodiment of the present invention, a ground on the reception side of the first duplexer  11  and the second duplexer  12  may be independent or common. 
       Configuration of Duplexer Device  10   
       [0106]      FIG. 5  is a schematic diagram showing an example of the configuration of the duplexer device  10 . 
         [0107]    The first ANT terminal  113  is electrically connected to any one of the pad  101   a,  the pad  101   j,  the pad  101   k  and the pad  101   l.  For example, if the first ANT terminal  113  is electrically connected to the pad  101   l,  the second ANT terminal  123  is electrically connected to any one of the pad  101   a,  the pad  101   j  and the pad  101   k.  That is, the first ANT terminal  113  and the second ANT terminal  123  are electrically connected to pads disposed along the first side  110 . 
         [0108]    In this example, the first Rx terminal  114  of the first duplexer  11  is electrically connected to any one of the pad  101   c  and the pad  101   d  disposed on the side of the second duplexer  12 . For example, if the first Rx terminal  114  is connected to the pad  101   c,  the second Rx terminal  124  is electrically connected to the pad  101   d.  That is, the first Rx terminal  114  and the second Rx terminal  124  are electrically connected to the pads disposed along the second side  120  and are also connected to the pads on the side of the second duplexer  12 , which have been sufficiently spaced apart from the ANT terminal. Furthermore, the first Rx terminal  114  may be connected to the pad  101   b  on the side of the first duplexer  11  of the second side  120 . 
         [0109]    The first Tx terminal  115  is electrically connected to any one of the pad  101   g,  the pad  101   h  and the pad  101   i.  For example, if the first Tx terminal  115  is electrically connected to the pad  101   i,  the second Tx terminal  125  is electrically connected to any one of the pad  101   g  and the pad  101   h.  That is, the first Tx terminal  115  and the second Tx terminal  125  are electrically connected to the pads disposed along the third side  130 . 
         [0110]    Specifically, the first ANT terminal  113  and the second ANT terminal  123  have only to be electrically connected to the pads disposed on the same side. Furthermore, the first Rx terminal  114  and the second Rx terminal  124  have only to be electrically connected to the pads disposed on the same side. Furthermore, the first Tx terminal  115  and the second Tx terminal  125  have only to be electrically connected to the pads disposed the same side. 
       Isolation Characteristic of First Duplexer  11   
       [0111]      FIGS. 6A, 6B, and 6C  are graphs showing the frequency characteristics and isolation characteristics of the first duplexer  11  in the duplexer device  10 . In the graphs of  FIGS. 6A to 6C , a horizontal axis is a frequency MHz and a vertical axis is an insertion loss dB. 
         [0112]    In the graph of  FIG. 6A , the horizontal axis is about 680 to 820 MHz and the vertical axis is −100 to 0 dB.  FIG. 6A  shows a first frequency characteristic  61   a  and a second frequency characteristic  62   a.  The first frequency characteristic  61   a  and the second frequency characteristic  62   a  correspond to frequency characteristics on the transmission side of the first duplexer  11 . 
         [0113]    In the case where the first frequency characteristic  61   a  is obtained and the case where the second frequency characteristic  62   a  is obtained, the connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer is different. 
         [0114]    Specifically, in the case where the first frequency characteristic  61   a  is obtained, in  FIG. 5 , the first ANT terminal  113  is connected to the pad  101   l  and the second ANT terminal  123  is connected to the pad  101   k.  Furthermore, the first Rx terminal  114  is connected to the pad  101   b  and the second Rx terminal  124  is connected to the pad  101   d.  That is, the second Rx terminal  124  is connected to a pad that belongs to the pads disposed along the second side  120  and that is located farthest from the first side  110 . Furthermore, the first Tx terminal  115  is connected to the pad  101   i  and the second Tx terminal  125  is connected to the pad  101   g.    
         [0115]    In contrast, the case where the second frequency characteristic  62   a  is obtained is different from the case where the first frequency characteristic  61   a  is obtained in that the first Rx terminal  114  is connected to the pad  101   c.  That is, in this case, the first Rx terminal  114  is connected to a pad that belongs to the pads disposed along the second side  120  and that is adjacent to a pad to which the second Rx terminal  124  is connected. 
         [0116]    In  FIG. 6A , the range of 703 to 733 MHz is the transmission band of the first duplexer  11 . As shown in  FIG. 6A , insertion losses in the transmission bands of the first frequency characteristic  61   a  and the second frequency characteristic  62   a  are almost identical. 
         [0117]    In the graph of  FIG. 6B , the horizontal axis is about 680 to 820 MHz and the vertical axis is −100 to 0 dB.  FIG. 6B  shows a first frequency characteristic  61   b  and a second frequency characteristic  62   b.  The first frequency characteristic  61   b  and the second frequency characteristic  62   b  correspond to frequency characteristics on the reception side of the first duplexer  11 . 
         [0118]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the first frequency characteristic  61   b  is obtained is the same as that in the case where the first frequency characteristic  61   a  of  FIG. 6A  is obtained. 
         [0119]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the second frequency characteristic  62   b  is obtained the same as that in the case where the second frequency characteristic  62   a  of  FIG. 6A  is obtained. 
         [0120]    In  FIG. 6B , the range of 758 to 788 MHz is the reception band of the first duplexer  11 . As shown in  FIG. 6B , insertion losses in the reception bands of the first frequency characteristic  61   b  and the second frequency characteristic  62   b  are almost identical. 
         [0121]    That is,  FIGS. 6A and 6B  illustrate that although the first Rx terminal  114  is connected to a pad distant from the first side  110 , frequency characteristics on the transmission side and reception side of the first duplexer  11  are rarely changed. 
         [0122]    In the graph of  FIG. 6C , the horizontal axis is about 680 to 820 MHz and the vertical axis is −80 to −30 dB.  FIG. 6C  shows a first isolation characteristic  63  and a second isolation characteristic  64 . The first isolation characteristic  63  and the second isolation characteristic  64  correspond to isolation characteristics of the first duplexer  11 . 
         [0123]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the first isolation characteristic  63  is obtained is the same as that in the case where the first frequency characteristic  61   a  of  FIG. 6A  is obtained. 
         [0124]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the second isolation characteristic  64  is obtained is the same as that in the case where the first frequency characteristic  62   a  of  FIG. 6  is obtained. 
         [0125]    As shown in  FIG. 6C , the second isolation characteristic  64  is about 10 dB better than the first isolation characteristic  63  on average in the transmission band of 703 to 733 MHz. That is,  FIG. 6C  illustrates that the isolation characteristic of the first duplexer  11  is improved because the first Rx terminal  114  is connected to a pad distant from the first side  110 . Furthermore, as shown in  FIG. 6C , the first isolation characteristic  63  and the second isolation characteristic  64  are almost identical in the reception band of 758 to 788 MHz. 
         [0126]    The reason for this is that since the first Rx terminal  114  is spaced apart from the first side  110 , the distance between the first Rx terminal  114  and the first ANT terminal  113  and the second ANT terminal  123  is increased and thus interference between the signals of the terminals has been suppressed. For this reason, the pads disposed along the second side  120  to which the first Rx terminal  113  and the second Rx terminal  114  are connected may be spaced apart from the first side  110  and may be disposed closer to the fourth side  140 . Furthermore, one of the first Rx terminal  114  and the second Rx terminal  124  may be connected to a pad located farthest from the first side  110 , and the other thereof may be connected to a pad adjacent to the pad located farthest from the first side  110 . 
         [0127]    Furthermore, in the substrate  100  for mounting a duplexer, the pad  101   b  may be used as the ground of the first duplexer  11  by connecting the first Rx terminal  114  to the pad  101   c  not the pad  101   b.  Accordingly, the first duplexer  11  can operate stably because the ground is strengthened. 
       Isolation Characteristic of Second Duplexer  12   
       [0128]      FIGS. 7A, 7B and 7C  are graphs showing the frequency characteristics and isolation characteristics of the second duplexer  12  in the duplexer device  10 . In the graphs of  FIGS. 7A to 7C , a horizontal axis is a frequency MHz and a vertical axis is an insertion loss dB. 
         [0129]    In the graph of  FIG. 7A , a horizontal axis is about 700 to 840 MHz and a vertical axis is −100 to 0 dB. 
         [0130]      FIG. 7A  shows a third frequency characteristic  71   a  and a fourth frequency characteristic  72   a.    
         [0131]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the third frequency characteristic  71   a  is obtained is the same as that in the case where the first frequency characteristic  61   a  of  FIG. 6A  is obtained. 
         [0132]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the fourth frequency characteristic  72   a  is obtained is the same as that in the case where the second frequency characteristic  62   a  of  FIG. 6A  is obtained. 
         [0133]    In the third frequency characteristic  71   a  and the fourth frequency characteristic  72   a,  the range of 718 to 748 MHz is the transmission band of the second duplexer  12 . As shown in  FIG. 7A , insertion losses in the transmission bands of the third frequency characteristic  71   a  and the fourth frequency characteristic  72   a  are almost identical. 
         [0134]    In the graph of  FIG. 7B , the horizontal axis is about 700 to 840 MHz and the vertical axis is −100 to 0 dB.  FIG. 7B  shows a third frequency characteristic  71   b  and a fourth frequency characteristic  72   b.  The third frequency characteristic  71   b  and the fourth frequency characteristic  72   b  correspond to frequency characteristics on the reception side of the second duplexer  12 . 
         [0135]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the third frequency characteristic  71   b  is obtained is the same as that in the case where the third frequency characteristic  71   a  of  FIG. 7A  is obtained. 
         [0136]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the fourth frequency characteristic  72   b  is obtained is the same as that in the case where the fourth frequency characteristic  72   a  of  FIG. 7A  is obtained. 
         [0137]    In  FIG. 7B  the range of 773 to 803 MHz is the reception band of the second duplexer  12 . As shown in  FIG. 7B , insertion losses in the reception bands of the third frequency characteristic  71   b  and the fourth frequency characteristic  72   b  are almost identical. That is,  FIGS. 7A and 7B  show that although the first Rx terminal  114  is connected to a pad distant from the first side  110 , frequency characteristics on the transmission side and reception side of the second duplexer  12  are rarely changed. 
         [0138]    In the graph of  FIG. 7C , the horizontal axis is about 700 to 840 MHz and the vertical axis is −80 to −30 dB.  FIG. 7C  shows a third isolation characteristic  73  and a fourth isolation characteristic  74 . The third isolation characteristic  73  and the second isolation characteristic  74  correspond to isolation characteristics of the second duplexer  12 . 
         [0139]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the third isolation characteristic  73  is obtained is the same as that in the case where the third frequency characteristic  71   a  of  FIG. 7A  is obtained. 
         [0140]    The connection of the first duplexer  11 , the second duplexer  12  and the substrate  100  for mounting a duplexer in the case where the fourth isolation characteristic  74  is obtained is the same as that in the case where the fourth frequency characteristic  72   a  of  FIG. 7A  is obtained. 
         [0141]    As shown in  FIG. 7C , insertion losses in the transmission band of 718 to 748 MHz and reception band of 773 to 803 MHz of the third isolation characteristic  73  and the fourth isolation characteristic  74  are almost identical. That is,  FIG. 7C  shows that the isolation characteristic of the second duplexer  12  is rarely changed although the first Rx terminal  114  is connected to a pad distant from the first side  110 . 
       Isolation Characteristic of Duplexer Device  10   
       [0142]    Accordingly, the duplexer device  10  can obtain the most excellent isolation characteristic by connecting the second Rx terminal  124  to a pad located farthest from the first side  110  and connecting the first Rx terminal  114  to a pad adjacent to the pad to which the second Rx terminal  124  is connected. 
         [0143]    In accordance with the present invention, an excellent isolation characteristic in a modulated dual duplexer device can be easily obtained. 
         [0144]    Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.