Abstract:
A duplexer module that is used for transmission and reception of a signal in at least two communication systems using different frequency bands includes a wiring board, dual transmission filters in a transmission filter unit that is provided on the wiring board and that includes a transmission filter, and dual reception filters in a reception filter unit that is provided on the wiring board and that includes a reception filter. Each of the dual reception filters includes at least two reception filters having different frequency bands, and the output side of the reception filters is shared between the reception filters such that a common output terminal is provided for the reception filters.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to duplexer modules and, more particularly, to a duplexer module preferably for use in transmission and reception of signals in at least two communication systems using different frequency bands. 
         [0003]    2. Description of the Related Art 
         [0004]    In recent years, an increase in the number of frequency bands and support of multiple communication systems have been advanced in mobile phone services in order to address, for example, an increase in the number of subscribers, global roaming enabling services to be used all over the world, an improvement in communication quality, and an increase in the capacity of a variety of content. As a result, multiple duplexers used in radio-frequency (RF) circuits are increasingly installed in mobile phones. In other words, duplexers corresponding to multiple bands and communication systems that are used are increasingly installed in the mobile phones. 
         [0005]    In addition to the increase in the number of duplexers installed in the mobile phones, duplexer modules in which multiple duplexers are integrated have been developed in order to decrease the size of mobile phones. Various duplexer modules have been proposed. 
         [0006]    For example, Japanese Unexamined Patent Application Publication No. 2003-517239 discloses a duplexer module M 1  schematically illustrated in  FIG. 16 . The duplexer module M 1  is connected between an antenna A and a low noise amplifier LNA and a power amplifier PA via switches S, S′, and S″ and includes multiple transmission filters and reception filters. The duplexer module M 1  includes transmission filters FT 1  and FT 2  and reception filters FR 1  and FR 2 , instead of providing a plurality of duplexers each including a transmission filter and a reception filter on a wiring board. The transmission filters FT 1  and FT 2  are collectively provided at one side of the wiring board of duplexer module M 1 , and the reception filters FR 1  and FR 2  are collectively provided at the opposite side of the wiring board of the duplexer module M 1 . Such an arrangement allows the wiring pattern on the wiring board to be simplified in order to reduce the size of the duplexer module M 1 . 
         [0007]    Technologies to arrange the wiring patterns of multiple surface acoustic wave filters together for simplification are known. For example, Japanese Unexamined Patent Application Publication No. 2002-208832 discloses an elastic wave apparatus schematically illustrated in  FIG. 17 . In the elastic wave apparatus in  FIG. 17 , balanced terminals  1305  and  1306  are commonly used for two balance filters  1301  and  1302  having different pass bands. Since an unbalanced terminal  1304  is also commonly used for the balance filters  1301  and  1302  in  FIG. 17 , the balance filters  1301  and  1302  function as one filter having the two pass bands. However, the elastic wave apparatus may be configured so that the unbalanced terminal is not commonly used for the balance filters  1301  and  1302 . 
         [0008]    In a typical duplexer module in the related art, multiple duplexers are provided on a wiring board and multiple transmission terminals and multiple reception terminals are collectively arranged on the rear surface of the wiring board. In order to simplify the wiring pattern on a circuit board on which components including the duplexer module, amplifiers, and switches are provided, it is necessary to use a layout in which the transmission terminals of the duplexer module are adjacently arranged and the reception terminals thereof are adjacently arranged. 
         [0009]    However, when the transmission terminals of the duplexer module are adjacently arranged and the reception terminals thereof are adjacently arranged in a configuration in which multiple duplexers are provided on the wiring board, the wiring pattern on the wiring board including the duplexers provided thereon is lengthened and complicated, which degrades isolation characteristics and insertion loss. 
         [0010]    Although the transmission filter FT 1  and the reception filter FR 1  support one frequency band and the transmission filter FT 2  and the reception filter FR 2  support another frequency band in Japanese Unexamined Patent Application Publication No. 2003-517239, the transmission filter FT 1  and the reception filter FR 1  may support the transmission band and the reception band of one communication system and the transmission filter FT 2  and the reception filter FR 2  may support the transmission band and the reception band of another communication system. Preparing the transmission filters and the reception filters of at least two communication systems using different frequency bands using the configuration described above to collectively arrange the transmission filters on the wiring board and collectively arrange the reception filters on the wiring board causes the wiring pattern on the wiring board to be lengthened and complicated, thus degrading electrical characteristics. 
         [0011]    The technology disclosed in Japanese Unexamined Patent Application Publication No. 2002-208832, was originally intended to commonly use the balanced terminals (output terminals) in the multiple surface acoustic wave filters in the elastic wave apparatus. The idea of arranging the wiring patterns of the duplexer module together in order to simplify the wiring patterns on the circuit board on which the duplexer module is provided is unknown. In addition, a specific method of producing a wiring board that does not have the degradation in isolation characteristics and insertion loss by arranging the wiring patterns together for simplification is not publicly known. 
       SUMMARY OF THE INVENTION 
       [0012]    In order to overcome the problems described above, preferred embodiments of the present invention provide a duplexer module capable of adjacently arranging transmission terminals and adjacently arranging reception terminals without degrading the electrical characteristics thereof. 
         [0013]    A duplexer module according to a preferred embodiment of the present invention is preferably used for transmission and reception of signals in at least two communication systems using different frequency bands. The duplexer module preferably includes a wiring board, a transmission filter unit that is provided on the wiring board and that includes a transmission filter, and a reception filter unit that is provided on the wiring board and that includes a reception filter. At least one reception filter unit includes at least two reception filters having different frequency bands, and the output side of the reception filters is shared between the reception filters such that an output terminal is commonly used for the reception filters. 
         [0014]    Since the output terminal is preferably commonly used for the reception filters in the reception filter unit including the multiple reception filters, the wiring pattern on the wiring board is simplified. Accordingly, the structure described above is superior in electrical characteristics, such as isolation characteristics and insertion loss, and less expensive than a case in which the output terminal is not commonly used for the reception filters. 
         [0015]    At least one transmission filter unit preferably includes at least two transmission filters having different frequency bands, and the input side of the transmission filters is preferably shared between the transmission filters such that an input terminal is commonly used for the transmission filters. 
         [0016]    Since the input terminal is preferably commonly used for the transmission filters in the transmission filter unit including the multiple transmission filters, the number of terminals is reduced to further simplify the wiring pattern on the wiring board. In addition, it is not necessary to include a switch connected to a power amplifier. 
         [0017]    A duplexer module according to another preferred embodiment of the present invention preferably includes a wiring board, a transmission filter unit that is provided on the wiring board and that includes a transmission filter, and a reception filter unit that is provided on the wiring board and that includes a reception filter. At least one transmission filter unit includes at least two transmission filters having different frequency bands, and the input side of the transmission filters is shared between the transmission filters such that an input terminal is commonly used for the transmission filters. 
         [0018]    Since the input terminal is preferably commonly used for the transmission filters in the transmission filter unit including the multiple transmission filters, the wiring pattern on the wiring board is simplified. Accordingly, the structure described above is superior in electrical characteristics, such as isolation characteristics and insertion loss, and is less expensive than a case in which the input terminal is not commonly used for the transmission filters. In addition, it is not necessary include a switch connected to the power amplifier. 
         [0019]    The wiring board preferably has a substantially rectangular first main surface and a substantially rectangular second main surface that are parallel or substantially parallel to each other, a first side surface, a second side surface adjacent to the first side surface, a third side surface opposing the first side surface, and a fourth side surface adjacent to the first side surface. A first conductive pattern including a plurality of pads on which the reception filter unit and the transmission filter unit are mounted is preferably provided on the first main surface of the wiring board. A second conductive pattern including a plurality of transmission terminals arranged along the first side surface, a plurality of antenna terminals arranged along the second side surface, and a plurality of reception terminals arranged along the third side surface is preferably provided on the second main surface of the wiring board. 
         [0020]    The first conductive pattern may preferably include a first wiring pattern connected to any pad. The second conductive pattern may preferably include a second wiring pattern connected to any terminal. 
         [0021]    The wiring patterns connecting the pads at the side of the first main surface of the wiring board to the terminals at the side of the second main surface thereof can be simplified so as to shorten the wiring patterns as much as possible, thus improving the isolation. 
         [0022]    The reception filter unit is preferably arranged near the third side surface of the wiring board on the first main surface of the wiring board. 
         [0023]    In this case, the wiring pattern between the reception filter and the reception terminals is shortened to improve the isolation. 
         [0024]    The transmission filter unit is preferably arranged near the first side surface of the wiring board on the first main surface of the wiring board. 
         [0025]    In this case, the wiring pattern between the transmission filter and the transmission terminals is preferably shortened to improve the isolation. 
         [0026]    The reception filter unit preferably includes an output terminal, and the output terminal of the reception filter unit is preferably connected to the pads arranged along the third side surface on the first main surface of the wiring board. 
         [0027]    In this case, the wiring pattern between the reception filter and the reception terminals is preferably shortened to improve the isolation. 
         [0028]    The transmission filter unit preferably includes an input terminal, and the input terminal of the transmission filter unit is preferably connected to the pads arranged along the first side surface on the first main surface of the wiring board. 
         [0029]    In this case, the wiring pattern between the transmission filter and the transmission terminals is shortened to improve the isolation. 
         [0030]    Since the duplexer module according to various preferred embodiments of the present invention simplify the wiring patterns on the wiring board, it is possible to adjacently arrange the transmission terminals and adjacently arrange the reception terminals without degrading the electrical characteristics thereof. 
         [0031]    The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0032]      FIG. 1  is a block diagram of a duplexer module for two bands according to a first preferred embodiment of the present invention. 
           [0033]      FIG. 2  is a block diagram illustrating how the duplexer module according to the first preferred embodiment of the present invention is used. 
           [0034]      FIG. 3  is a plan view illustrating a state in which components are mounted on a front surface of a wiring board of the duplexer module according to the first preferred embodiment of the present invention. 
           [0035]      FIG. 4  is a plan view illustrating a conductive pattern on the front surface of the wiring board according to the first preferred embodiment of the present invention. 
           [0036]      FIG. 5  is a perspective view illustrating a conductive pattern on a rear surface of the wiring board according to the first preferred embodiment of the present invention. 
           [0037]      FIG. 6A  is a plan view of a first-layer conductive pattern of the wiring board,  FIG. 6B  is a perspective view of second-layer and third-layer conductive patterns of the wiring board, and  FIG. 6C  is a perspective view of a fourth-layer conductive pattern of the wiring board according to the first preferred embodiment of the present invention. 
           [0038]      FIG. 7  is a block diagram of a duplexer module for two bands according to a second preferred embodiment of the present invention. 
           [0039]      FIG. 8  is a block diagram illustrating how the duplexer module is used according to the second preferred embodiment of the present invention. 
           [0040]      FIG. 9  is a block diagram of a duplexer module for two bands according to a comparative example. 
           [0041]      FIG. 10  is a plan view illustrating a state in which components are mounted on a front surface of a wiring board of the duplexer module according to the comparative example. 
           [0042]      FIG. 11  is a plan view illustrating a conductive pattern on the front surface of the wiring board according to the comparative example. 
           [0043]      FIG. 12  is a perspective view illustrating a conductive pattern on a rear surface of the wiring board according to the comparative example. 
           [0044]      FIG. 13A  is a plan view of a first-layer conductive pattern of the wiring board and  FIG. 13B  is a perspective view of a sixth-layer conductive pattern of the wiring board according to the comparative example. 
           [0045]      FIG. 14A  is a perspective view of a second-layer conductive pattern of the wiring board and  FIG. 14B  is a perspective view of a third-layer conductive pattern of the wiring board according to the comparative example. 
           [0046]      FIG. 15A  is a perspective view of a fourth-layer conductive pattern of the wiring board and  FIG. 15B  is a perspective view of a fifth-layer conductive pattern of the wiring board according to the comparative example. 
           [0047]      FIG. 16  schematically illustrates the structure of a duplexer module of the related art. 
           [0048]      FIG. 17  schematically illustrates the structure of an elastic wave apparatus of the related art. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0049]    Preferred embodiments of the present invention will be described with reference to  FIGS. 1 to 15B . 
       First Preferred Embodiment 
       [0050]    A duplexer module  10  according to a first preferred embodiment of the present invention will now be described with reference to  FIGS. 1 to 6B . 
         [0051]    The duplexer module  10  of the first preferred embodiment includes transmission filters and reception filters provided therein and is preferably used in a mobile phone, for example. The transmission filters and the reception filters preferably support, for example, four bands (bands  1 ,  2 ,  5 , and  8 ) in Universal Mobile Telecommunications System (UMTS). 
         [0052]    The band  1  of the UMTS has a transmission band (Tx band) of 1,920 MHz to 1,980 MHz and a reception band (Rx band) of 2,110 MHz to 2,170 MHz. The band  2  of the UMTS has a Tx band of 1,850 MHz to 1,910 MHz and an Rx band of 1,930 MHz to 1,990 MHz. The band  5  of the UMTS has a Tx band of 824 MHz to 849 MHz and an Rx band of 869 MHz to 894 MHz. The band  8  of the UMTS has a Tx band of 880 MHz to 915 MHz and an Rx band of 925 MHz to 960 MHz. 
         [0053]    The transmission filter and the reception filter supporting the band  1  and the band  2  and the transmission filter and the reception filter supporting the band  5  and the band  8  are preferably arranged as illustrated in the block diagram in  FIG. 1 . 
         [0054]    Specifically, referring to  FIG. 1 , a band A supports the band  1  or the band  5  and a band B supports the band  2  or the band  8 . A reception filter unit for the band A and the band B (a dual reception filter  16  for the band  1  and the band  2  and a dual reception filter  17  for the band  5  and the band  8 ), a transmission filter unit for the band A and the band B (a dual transmission filter  14  for the band  1  and the band  2  and a dual transmission filter  15  for the band  5  and the band  8 ), and matching circuits for the band A and the band B (a matching circuit  14   a  for the band  1 , a matching circuit  14   b  for the band  2 , a matching circuit  15   a  for the band  5 , and a matching circuit  15   b  for the band  8 ) are preferably provided on a wiring board  12  represented by an alternate long and short dash line. 
         [0055]    Preferably, each of the dual reception filters  16  and  17  in the reception filter unit includes a reception filter for the band A and a reception filter for the band B, which are different in frequency, and two unbalanced inputs-one balanced output. Specifically, the reception filters for the band A and the band B are preferably filters having a balanced-unbalanced conversion function, and a balanced output terminal is commonly used for the reception filter for the band A and the reception filter for the band B in the dual reception filters  16  and  17 . As illustrated in  FIG. 1 , each of the dual reception filters  16  and  17  preferably includes an unbalanced input terminal connected to the matching circuits  14   a  and  15   a  for the band A, an unbalanced input terminal connected to the matching circuits  14   b  and  15   b  for the band B, and a pair of balanced output terminals commonly used for the band A and the band B. 
         [0056]    The dual transmission filters  14  and  15  in the transmission filter unit preferably include transmission filters  14   s  and  14   t , and  15   s  and  15   t  with unbalanced input and output for the band A and the band B (the transmission filter  14   s  for the band  1 , the transmission filter  14   t  for the band  2 , the transmission filter  15   s  for the band  5 , and the transmission filter  15   t  for the band  8 ), and include two unbalanced inputs-two unbalanced outputs. As illustrated in  FIG. 1 , each of the dual transmission filters  14  and  15  preferably includes an unbalanced output terminal connected to the matching circuits  14   a  and  15   a  for the band A, an unbalanced output terminal connected to the matching circuits  14   b  and  15   b  for the band B, an unbalanced input terminal for the band A, and an unbalanced input terminal for the band B. 
         [0057]    Since the duplexer module  10  of the first preferred embodiment supports the bands  1 ,  2 ,  5 , and  8 , the dual reception filter  16  for the band  1  and the band  2 , the dual transmission filter  14  for the band  1  and the band  2 , the matching circuit  14   a  for the band  1 , the matching circuit  14   b  for the band  2 , the dual reception filter  17  for the band  5  and the band  8 , the dual transmission filter  15  for the band  5  and the band  8 , the matching circuit  15   a  for the band  5 , and the matching circuit  15   b  for the band  8  are provided on the wiring board  12 . The duplexer module  10  of the first preferred embodiment preferably includes an antenna terminal Ant_A for the band  1 , an antenna terminal Ant_B for the band  2 , a transmission terminal Tx_A for the band  1 , a transmission terminal Tx_B for the band  2 , a reception terminal Rx_A&amp;Rx_B commonly used for the band  1  and the band  2 , an antenna terminal Ant_A for the band  5 , an antenna terminal Ant_B for the band  8 , a transmission terminal Tx_A for the band  5 , a transmission terminal Tx_B for the band  8 , and a reception terminal Rx_A&amp;Rx_B commonly used for the band  5  and the band  8 . 
         [0058]    The reception filters in the dual reception filters  16  and  17  and the transmission filters in the dual transmission filters  14  and  15  are preferably defined by, for example, surface acoustic wave filters, boundary acoustic wave filters, or bulk wave resonator filters. When the reception filters and the transmission filters are defined by the surface acoustic wave filters or the boundary acoustic wave filters, the reception filter for the band A and the reception filter for the band B in the dual reception filters  16  and  17  may preferably be provided on one piezoelectric substrate. The transmission filter for the band A and the transmission filter for the band B in the dual transmission filters  14  and  15  may also preferably be provided on one piezoelectric substrate. 
         [0059]    The matching circuits may also preferably be provided at the side of the transmission terminals Tx_A and Tx_B and the reception terminals Rx_A&amp;Rx_B of the dual reception filters  16  and  17  and the dual transmission filters  14  and  15 , in addition to the side of the antenna terminals Ant_A and Ant_B thereof. 
         [0060]      FIG. 2  is a block diagram illustrating one example of how the duplexer module  10  of the first preferred embodiment is preferably used. As illustrated in  FIG. 2 , preferably, four antenna terminals supporting the bands  1 ,  2 ,  5 , and  8  of the duplexer module  10  are connected to an antenna  2  via a switching circuit  4 . Four reception terminals of the duplexer module  10  are preferably connected to an Rx terminal of a radio-frequency integrated circuit (RFIC)  6 . The four reception terminals of the duplexer module  10  preferably include a pair of balanced output terminals commonly used for the reception filters for the band  1  and the band  2  and a pair of balanced output terminals commonly used for the reception filters for the band  5  and the band  8 . Four transmission terminals supporting the bands  1 ,  2 ,  5 , and  8  of the duplexer module  10  are preferably connected to a Tx terminal of the RFIC  6  via a power amplifier module  8 . The four transmission terminals of the duplexer module  10  are preferably unbalanced input terminals corresponding to the respective transmission filters for the bands  1 ,  2 ,  5 , and  8 . The power amplifier module  8  preferably includes Single Pole Double Throw (SPDT) switches  9  connected between power amplifiers in the power amplifier module  8  and the transmission terminals of the duplexer module  10  in order to reduce the number of power amplifiers. 
         [0061]    Adjacently arranging the multiple reception terminals of the duplexer module  10  and adjacently arranging the multiple transmission terminals of the duplexer module  10  enable the wiring pattern on a circuit board on which the duplexer module  10 , the RFIC  6 , and other components are provided to be simplified and enable the size of the circuit board to be reduced. 
         [0062]      FIG. 3  is a plan view illustrating a state in which components are mounted on a front surface  12   a  of the wiring board  12  of the duplexer module  10  of the first preferred embodiment.  FIG. 4  is a plan view of the front surface  12   a  of the wiring board  12 .  FIG. 5  is a perspective view of a rear surface  12   b  of the wiring board  12 . 
         [0063]    As illustrated in  FIG. 3  to  FIG. 5 , the wiring board has a substantially rectangular front surface  12   a  and a substantially rectangular rear surface  12   b , which are parallel or substantially parallel to each other and which define a first main surface and a second main surface, and four side surfaces defined by first to fourth side surfaces  12   p ,  12   q ,  12   r , and  12   s.    
         [0064]    As illustrated in  FIG. 3 , the dual transmission filter  14  for the band  1  and the band  2 , the dual transmission filter  15  for the band  5  and the band  8 , the dual reception filter  16  for the band  1  and the band  2 , the dual reception filter  17  for the band  5  and the band  8 , and chip components (multilayer chip capacitors or inductors)  14   a ,  14   b ,  15   a ,  15   b ,  16   a  to  16   c  and  17   a  to  17   c  defining the matching circuits are preferably mounted on the front surface  12   a  of the wiring board  12 . 
         [0065]    The dual transmission filters  14  and  15  are preferably arranged near the first side surface  12   p  of the wiring board  12  on the front surface  12   a  of the wiring board  12 . The dual reception filters  16  and  17  are preferably arranged near the third side surface  12   r  of the wiring board  12  on the front surface  12   a  of the wiring board  12 . 
         [0066]    As illustrated in  FIG. 4 , a first conductive pattern is preferably provided on the front surface  12   a  of the wiring board  12 . Broken lines in  FIG. 4  indicate the terminal portions of the dual transmission filters  14  and  15 , the dual reception filters  16  and  17 , and the chip components  14   a ,  14   b ,  15   a ,  15   b ,  16   a  to  16   c , and  17   a  to  17   c , which are mounted on the front surface  12   a  of the wiring board  12 . As illustrated in  FIG. 4 , for example, pads  21   t ′,  22   t ′,  25   t ′, and  28   t ′;  21   a ′,  22   a ′,  25   a ′, and  28   a ′; and  20   p ′,  20   q ′,  24   p ′, and  24   q ′ connected to the dual transmission filters  14  and  15 , the dual reception filters  16  and  17 , and the chip components  14   a ,  14   b ,  15   a ,  15   b ,  16   a  to  16   c , and  17   a  to  17   c  are preferably arranged on portions on which the broken lines are superposed on the first conductive pattern provided on the front surface  12   a  of the wiring board  12 . In addition, a first wiring pattern connected to these pads is provided. 
         [0067]    The dual transmission filter  14  includes an unbalanced input terminal corresponding to the transmission filter  14   s  for the band  1  and an unbalanced input terminal corresponding to the transmission filter  14   t  for the band  2 . The dual transmission filter  15  includes an unbalanced input terminal corresponding to the transmission filter  15   s  for the band  5  and an unbalanced input terminal corresponding to the transmission filter  15   t  for the band  8 . 
         [0068]    The pads  21   t ′,  22   t ′,  25 ′, and  28   t ′ are preferably arranged along the first side surface  12   p  on the wiring board  12  of the wiring board  12 . The unbalanced input terminal corresponding to the transmission filter  14   s  for the band  1  in the dual transmission filter  14  is preferably connected to the pad  21   t ′ and the unbalanced input terminal corresponding to the transmission filter  14   t  for the band  2  in the dual transmission filter  14  is preferably connected to the pad  22   t ′. The unbalanced input terminal corresponding to the transmission filter  15   s  for the band  5  in the dual transmission filter  15  is preferably connected to the pad  25   t ′ and the unbalanced input terminal corresponding to the transmission filter  15   t  for the band  8  in the dual transmission filter  15  is preferably connected to the pad  28   t′.    
         [0069]    The dual reception filter  16  preferably includes a pair of balanced output terminals commonly used for the reception filters for the band  1  and the band  2 . The dual reception filter  17  preferably includes a pair of balanced output terminals commonly used for the reception filters for the band  5  and the band  8 . 
         [0070]    The pads  20   p ′,  20   q ′,  24   p ′, and  24   q ′ are preferably arranged along the third side surface  12   r  on the front surface  12   a  of the wiring board  12 . One of the paired balanced output terminals commonly used for the reception filters for the band  1  and the band  2  in the dual reception filter  16  is preferably connected to the pad  20   p ′ and the other thereof is preferably connected to the pad  20   q ′. One of the paired balanced output terminals commonly used for the reception filters for the band  5  and the band  8  in the dual reception filter  17  is preferably connected to the pad  24   p ′ and the other thereof is preferably connected to the pad  24   q′.    
         [0071]    The dual transmission filter  14  preferably includes an unbalanced output terminal corresponding to the transmission filter  14   s  for the band  1  and an unbalanced output terminal corresponding to the transmission filter  14   t  for the band  2 . The dual reception filter  16  preferably includes an unbalanced input terminal corresponding to the reception filter for the band  1  and an unbalanced input terminal corresponding to the reception filter for the band  2 . 
         [0072]    The unbalanced output terminal corresponding to the transmission filter  14   s  for the band  1  in the dual transmission filter  14  and the unbalanced input terminal corresponding to the reception filter for the band  1  in the dual reception filter  16  are preferably connected to the pad  21   a ′. The unbalanced output terminal corresponding to the transmission filter  14   t  for the band  2  in the dual transmission filter  14  and the unbalanced input terminal corresponding to the reception filter for the band  2  in the dual reception filter  16  are preferably connected to the pad  22   a′.    
         [0073]    The dual transmission filter  15  preferably includes an unbalanced output terminal corresponding to the transmission filter  15   s  for the band  5  and an unbalanced output terminal corresponding to the transmission filter  15   t  for the band  8 . The dual reception filter  17  preferably includes an unbalanced input terminal corresponding to the reception filter for the band  5  and an unbalanced input terminal corresponding to the reception filter for the band  8 . 
         [0074]    The unbalanced output terminal corresponding to the transmission filter  15   s  for the band  5  in the dual transmission filter  15  and the unbalanced input terminal corresponding to the reception filter for the band  5  in the dual reception filter  17  are preferably connected to the pad  25   a ′. The unbalanced output terminal corresponding to the transmission filter  15   t  for the band  8  in the dual transmission filter  15  and the unbalanced input terminal corresponding to the reception filter for the band  8  in the dual reception filter  17  are preferably connected to the pad  28   a′.    
         [0075]    As illustrated in  FIG. 5 , a second conductive pattern is preferably arranged on the rear surface  12   b  of the wiring board  12 . Specifically, a transmission terminal  21   t  for the band  1 , a transmission terminal  22   t  for the band  2 , a transmission terminal  25   t  for the band  5 , and a transmission terminal  28   t  for the band  8  are preferably arranged along the first side surface  12   p  of the wiring board  12 . An antenna terminal  21   a  for the band  1 , an antenna terminal  22   a  for the band  2 , an antenna terminal  25   a  for the band  5 , and an antenna terminal  28   a  for the band  8  are preferably arranged along the second side surface  12   q  of the wiring board  12 . Reception terminals  20   p  and  20   q , which are preferably balanced output terminals commonly used for the band  1  and the band  2 , and reception terminals  24   p  and  24   q , which are balanced output terminals commonly used for the band  5  and the band  8 , are preferably arranged along the third side surface  12   r  of the wiring board  12 . In addition, a second wiring pattern connected to the antenna terminals  22   a ,  25   a , and  28   a  and shield patterns  24   a  and  24   b  are preferably arranged on the rear surface  12   b  of the wiring board  12 . A ground terminal is preferably arranged between the transmission terminal  21   t  for the band  1  and the transmission terminal  22   t  for the band  2  and a ground terminal is preferably arranged between the transmission terminal  25   t  for the band  5  and the transmission terminal  28   t  for the band  8 . 
         [0076]    Preferably, the transmission terminal  21   t  for the band  1  corresponds to the transmission terminal Tx_A for the band  1  in  FIG. 1 . The transmission terminal  22   t  for the band  2  corresponds to the transmission terminal Tx_B for the band  2  in  FIG. 1 . The transmission terminal  25   t  for the band  5  corresponds to the transmission terminal Tx_A for the band  5  in  FIG. 1 . The transmission terminal  28   t  for the band  8  corresponds to the transmission terminal Tx_B for the band  8  in  FIG. 1 . 
         [0077]    Preferably, the antenna terminal  21   a  for the band  1  corresponds to the antenna terminal Ant_A for the band  1  in  FIG. 1 . The antenna terminal  22   a  for the band  2  corresponds to the antenna terminal Ant_B for the band  2  in  FIG. 1 . The antenna terminal  25   a  for the band  5  corresponds to the antenna terminal Ant_A for the band  5  in  FIG. 1 . The antenna terminal  28   a  for the band  8  corresponds to the antenna terminal Ant_B for the band  8  in  FIG. 1 . 
         [0078]    The reception terminals  20   p  and  20   q , which are the balanced output terminals commonly used for the band  1  and the band  2 , preferably correspond to the reception terminal Rx_A&amp;Rx_B commonly used for the band  1  and the band  2  in  FIG. 1 . The reception terminals  24   p  and  24   q , which are the balanced output terminals commonly used for the band  5  and the band  8 , preferably correspond to the reception terminal Rx_A&amp;Rx_B commonly used for the band  5  and the band  8  in  FIG. 1 . 
         [0079]    Black circles () in  FIG. 4  indicate the positions of feed-through conductors that vertically extend with respect to the front surface  12   a  and the rear surface  12   b  of the wiring board  12  in the wiring board  12  and that electrically connect the first conductive pattern on the front surface  12   a  of the wiring board  12  to the second conductive pattern on the rear surface  12   b  thereof. 
         [0080]    As illustrated in  FIGS. 6A to 6C , the wiring board  12  is preferably manufactured by laminating four conductive patterns  11   a  to  11   d  on three dielectric layers made of resin or ceramics.  FIG. 6A  is a plan view of the first-layer conductive pattern  11   a  and corresponds to  FIG. 4 . Specifically, the first-layer conductive pattern  11   a  is the first conductive pattern.  FIG. 6B  is a perspective view of the second-layer and third-layer conductive patterns  11   b  and  11   c . The second-layer conductive pattern  11   b  has the same or substantially the same shape as that of the third-layer conductive pattern  11   c .  FIG. 6C  is a perspective view of the fourth-layer conductive pattern  11   d  and corresponds to  FIG. 5 . Specifically, the fourth-layer conductive pattern  11   d  is the second conductive pattern. Black circles () in  FIGS. 6A-6C  indicate the positions of feed-through conductors. The black circles () in  FIG. 6A  indicate the positions of the feed-through conductors that vertically extend with respect to the front surface  12   a  and the rear surface  12   b  of the wiring board  12  in the wiring board  12  and that electrically connect the first conductive pattern (the conductive pattern  11   a ) on the front surface  12   a  of the wiring board  12  to the second conductive pattern (the conductive pattern  11   d ) on the rear surface  12   b  thereof, like the black circles () in  FIG. 4 . The black circles () in  FIG. 6B  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  11   b  to the conductive pattern  11   a  and the feed-through conductors that electrically connect the conductive pattern  11   c  to the conductive pattern  11   b . The black circles () in  FIG. 6C  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  11   d  to the conductive pattern  11   c.    
         [0081]    As illustrated in  FIGS. 6A to 6C , a shield pattern  13  separated from the feed-through conductors is preferably provided on the second-layer and third-layer conductive patterns  11   b  and  11   c  sandwiched between the first-layer conductive pattern  11   a  on which the first conductive pattern including the pads having the dual transmission filters  14  and  15 , the dual reception filters  16  and  17 , and the chip components  14   a ,  14   b ,  15   a ,  15   b ,  16   a  to  16   c , and  17   a  to  17   c  mounted thereon is provided and the fourth-layer conductive pattern  11   d  on which the second conductive pattern including the terminals used for mounting the duplexer module  10  on the circuit board is provided. The shield pattern  13  extends parallel or substantially parallel to the front surface  12   a  and the rear surface  12   b  of the wiring board  12  in the wiring board  12 . 
         [0082]    Referring to  FIG. 4 , among the pads at the side of the front surface  12   a  of the wiring board  12 , the pads electrically connected to the terminals at the side of the rear surface  12   b  of the wiring board  12  illustrated in  FIG. 5  are denoted by reference numerals with the addition of a slash (′) to the reference numerals of the terminals to which the pads are electrically connected. 
         [0083]    As shown in  FIG. 4  to  FIG. 6C , the transmission terminals  21   t ,  22   t ,  25   t , and  28   t  are electrically connected to the pads  21   t ′,  22   t ′,  25   t ′, and  28   t ′ via the feed-through conductors without routing the wiring pattern. The wiring pattern connecting the antenna terminals  21   a ,  22   a ,  25   a , and  28   a  to the pads  21   a ′,  22   a ′,  25   a ′, and  28   a ′ is preferably routed on the front surface  12   a  and the rear surface  12   b  of the wiring board  12 . The wiring pattern connecting the reception terminals  20   p ,  20   q ,  24   p , and  24   q  to the pads  20   p ′,  20   q ′,  24   p ′, and  24   q ′ is preferably routed on the front surface  12   a  of the wiring board  12 . 
         [0084]    Since the wiring pattern connecting the pads on the front surface  12   a  of the wiring board  12  to the terminals on the rear surface  12   b  thereof is not routed in the wiring board  12 , the structure of the wiring board  12  is simplified. Accordingly, the duplexer module  10  has a reduced amount of conductor loss due to the wiring patterns and improved transmission characteristics. In addition, linkage between the wiring patterns is prevented so as to improve the isolation characteristics. 
         [0085]    Furthermore, since the duplexer module  10  includes a decreased number of layers of the wiring board as compared to the structure of a typical duplexer module in which the duplexers of the respective bands are provided on the wiring board, as in a comparative example described below, it is possible to reduce the profile and to reduce the cost of the duplexer module. 
       Second Preferred Embodiment 
       [0086]    A duplexer module  10   x  according to a second preferred embodiment of the present invention will now be described with reference to  FIG. 7  and  FIG. 8 . 
         [0087]    The duplexer module  10   x  of the second preferred embodiment is preferably configured in substantially the same manner as in the duplexer module  10  of the first preferred embodiment. The same reference numerals are used in the second preferred embodiment to identify the same components as those of the first preferred embodiment. Differences from the first preferred embodiment will primarily be described below. 
         [0088]    The duplexer module  10   x  of the second preferred embodiment includes transmission filters and reception filters provided therein and the transmission filters and the reception filters support the four bands (bands  1 ,  2 ,  5 , and  8 ) in the UMTS, as in the duplexer module  10  of the first preferred embodiment. 
         [0089]    In the duplexer module  10   x , the transmission filter and the reception filter supporting the band  1  and the band  2  and the transmission filter and the reception filter supporting the band  5  and the band  8  are configured as shown in the block diagram in  FIG. 7 . Referring to  FIG. 7 , the band  1  or the band  5  corresponds to the band A and the band  2  or the band  8  corresponds to the band B. 
         [0090]    As illustrated in  FIG. 7 , the reception filter unit for the band A and the band B (the dual reception filter  16  for the band  1  and the band  2  and the dual reception filter  17  for the band  5  and the band  8 ), a transmission filter unit for the band A and the band B (a dual transmission filter  14   x  for the band  1  and the band  2  and a dual transmission filter  15   x  for the band  5  and the band  8 ), and matching circuits for the band A and the band B (a matching circuit  14   y  for the band  1 , a matching circuit  14   z  for the band  2 , a matching circuit  15   y  for the band  5 , and a matching circuit  15   z  for the band  8 ) are provided on the wiring board  12  represented by an alternate long and short dash line, as in the first preferred embodiment. 
         [0091]      FIG. 8  is a block diagram illustrating how the duplexer module  10   x  of the second preferred embodiment is used. As illustrated in the block diagram in  FIG. 8 , preferably, four antenna terminals supporting the bands  1 ,  2 ,  5 , and  8  of the duplexer module  10   x  are connected to the antenna  2  via the switching circuit  4  and four reception terminals of the duplexer module  10   x  are connected to the Rx terminal of the RFIC  6 , as in the first preferred embodiment. The four reception terminals of the duplexer module  10   x  preferably include a pair of balanced output terminals commonly used for the reception filters for the band  1  and the band  2  and a pair of balanced output terminals commonly used for the reception filters for the band  5  and the band  8 . Two transmission terminals of the duplexer module  10   x  are connected to the Tx terminal of the RFIC  6  via a power amplifier module  8   x . Preferably, the two transmission terminals of the duplexer module  10   x  are an unbalanced input terminal commonly used for the transmission filters for the band  1  and the band  2  and an unbalanced input terminal commonly used for the transmission filters for the band  5  and the band  8 . 
         [0092]    As in the first preferred embodiment, each of the dual reception filters  16  and  17  in the reception filter unit preferably includes a reception filter for the band A and a reception filter for the band B, which are different in frequency, and include two unbalanced inputs-one balanced output. Specifically, a balanced output terminal is preferably commonly used for the reception filter for the band A and the reception filter for the band B in the dual reception filters  16  and  17 . The reception filters for the band A and the band B are preferably filters having the balanced-unbalanced conversion function. As illustrated in  FIG. 7 , each of the dual reception filters  16  and  17  preferably includes an unbalanced input terminal connected to the matching circuits  14   y  and  15   y  for the band A, an unbalanced input terminal connected to the matching circuits  14   z  and  15   z  for the band B, and a pair of balanced output terminals commonly used for the band A and the band B. 
         [0093]    Each of the dual transmission filters  14   x  and  15   x  in the transmission filter unit preferably includes a transmission filter for the band A and a transmission filter for the band B, which are different in frequency, and includes one unbalanced input-two unbalanced outputs. An unbalanced input terminal is preferably commonly used for the transmission filter for the band A and the transmission filter for the band B in the dual transmission filters  14   x  and  15   x , unlike the dual transmission filters  14  and  15  of the first preferred embodiment. Specifically, as illustrated in  FIG. 7 , each of the dual transmission filters  14   x  and  15   x  preferably includes an unbalanced output terminal connected to the matching circuits  14   y  and  15   y  for the band A, an unbalanced output terminal connected to the matching circuits  14   z  and  15   z  for the band B, and an unbalanced input terminal commonly used for the band A and the band B. 
         [0094]    Since the duplexer module  10   x  of the second preferred embodiment supports the bands  1 ,  2 ,  5 , and  8 , the dual reception filter  16  for the band  1  and the band  2 , the dual transmission filter  14   x  for the band  1  and the band  2 , the matching circuit  14   y  for the band  1 , the matching circuit  14   z  for the band  2 , the dual reception filter  17  for the band  5  and the band  8 , the dual transmission filter  15   x  for the band  5  and the band  8 , the matching circuit  15   y  for the band  5 , and the matching circuit  15   z  for the band  8  are provided on the wiring board  12 . The duplexer module  10   x  of the second preferred embodiment preferably includes the antenna terminal Ant_A for the band  1 , the antenna terminal Ant_B for the band  2 , a transmission terminal Tx_A&amp;Tx_B commonly used for the band  1  and the band  2 , the reception terminal Rx_A&amp;Rx_B commonly used for the band  1  and the band  2 , the antenna terminal Ant_A for the band  5 , the antenna terminal Ant_B for the band  8 , a transmission terminal Tx_A&amp;Tx_B commonly used for the band  5  and the band  8 , and the reception terminal Rx_A&amp;Rx_B commonly used for the band  5  and the band  8 . 
         [0095]    The same input terminal can preferably be commonly used for the transmission filter for the band A and the transmission filter for the band B so as to reduce the number of terminals in the transmission filter unit including the multiple transmission filters, thus simplifying the wiring patterns on the wiring board. In addition, since the matching circuit can be commonly used when the matching circuit is connected at the side of the input terminal of the transmission filter unit, the number of chip components defining the matching circuit can be reduced by half. Furthermore, it is not necessary to provide the SPDT switch, which should be provided between the power amplifier in the power amplifier module  8   x  and the duplexer module  10   x  to switch the transmission filter. 
         [0096]    Preferably, the balanced output terminal is commonly used for the reception filter for the band A and the reception filter for the band B in the dual reception filters  16  and  17  in the reception filter unit and the unbalanced input terminal is commonly used for the transmission filter for the band A and the transmission filter for the band B in the dual transmission filters  14   x  and  15   x  in the transmission filter unit in the second preferred embodiment. However, preferred embodiments of the present invention are not limited to such a configuration. 
         [0097]    For example, the balanced output terminal may not be commonly used for the reception filter for the band A and the reception filter for the band B in the dual reception filters in the reception filter unit whereas the unbalanced input terminal may be commonly used for the transmission filter for the band A and the transmission filter for the band B in the dual transmission filters in the transmission filter unit. 
         [0098]    With the above configuration, since the input terminal is commonly used for the transmission filters in the transmission filter unit including the multiple transmission filters, the wiring patterns on the wiring board can be simplified. Accordingly, this configuration is superior in terms of electrical characteristics, such as isolation characteristics and insertion loss, and in terms of cost as compared to a case in which the input terminal is not commonly used for the transmission filters. In addition, it is not necessary to use the switches in the connection to the power amplifier. 
       Comparative Example 
       [0099]    A duplexer module of a comparative example will now be described with reference to  FIG. 9  to  FIG. 15B . 
         [0100]    The duplexer module of the comparative example supports the four bands (the bands  1 ,  2 ,  5 , and  8 ) in the UMTS, as in the first and second preferred embodiments. The duplexer module of the comparative example includes four duplexers corresponding to the respective bands  1 ,  2 ,  5 , and  8  provided therein. The duplexer supporting the band  1 , the duplexer supporting the band  2 , the duplexer supporting the band  5 , and the duplexer supporting the band  8  are configured as illustrated in the block diagram in  FIG. 9 . 
         [0101]    Specifically, the band A corresponds to the band  1  or the band  5  and the band B corresponds to the band  2  or the band  8 . Duplexers (a duplexer  54  for the band  1  and a duplexer  55  for the band  5 ) each including the transmission filter and the reception filter for the band A and duplexers (a duplexer  56  for the band  2  and a duplexer  57  for the band  8 ) each including the transmission filter and the reception filter for the band B are provided on a wiring board  52  represented by an alternate long and short dash line. As illustrated in  FIG. 9 , each of the duplexers includes the transmission filter of unbalanced input and output and the reception filter of unbalanced input-balanced output, having the balanced-unbalanced conversion function. 
         [0102]    Since the duplexer module of the comparative example supports the bands  1 ,  2 ,  5 , and  8 , the duplexer  54  for the band  1 , the duplexer  56  for the band  2 , the duplexer  55  for the band  5 , and the duplexer  57  for the band  8  are provided on the wiring board  52 . The duplexer module of the comparative example includes an antenna terminal Ant_A for the band  1 , an antenna terminal Ant_B for the band  2 , a transmission terminal Tx_A for the band  1 , a transmission terminal Tx_B for the band  2 , a reception terminal Rx_A for the band  1 , a reception terminal Rx_B for the band  2 , an antenna terminal Ant_A for the band  5 , an antenna terminal Ant_B for the band  8 , a transmission terminal Tx_A for the band  5 , a transmission terminal Tx_B for the band  8 , a reception terminal Rx_A for the band  5 , and a reception terminal Rx_B for the band  8 . 
         [0103]    Four antenna terminals supporting the bands  1 ,  2 ,  5 , and  8  of the duplexer module of the comparative example are connected to an antenna  2  via a switching circuit  4 . Eight reception terminals of the duplexer module of the comparative example are connected to an Rx terminal of a RFIC  6 . The eight reception terminals of the duplexer module of the comparative example include a pair of balanced output terminals corresponding to the reception filter for the band  1 , a pair of balanced output terminals corresponding to the reception filter for the band  2 , a pair of balanced output terminals corresponding to the reception filter for the band  5 , and a pair of balanced output terminals corresponding to the reception filter for the band  8 . Four transmission terminals supporting the bands  1 ,  2 ,  5 , and  8  of the duplexer module of the comparative example are connected to a Tx terminal of the RFIC  6  via a power amplifier module  8 . The four transmission terminals of the duplexer module of the comparative example are unbalanced input terminals corresponding to the respective transmission filters for the bands  1 ,  2 ,  5 , and  8 . 
         [0104]      FIG. 10  is a plan view illustrating a state in which components are mounted on a front surface  52   a  of the wiring board  52  of the duplexer module of the comparative example.  FIG. 11  is a plan view of the front surface  52   a  of the wiring board  52 .  FIG. 12  is a perspective view of a rear surface  52   b  of the wiring board  52 . 
         [0105]    As illustrated in  FIG. 10 , the duplexer  54  for the band  1 , the duplexer  55  for the band  5 , the duplexer  56  for the band  2 , the duplexer  57  for the band  8 , and chip components (multilayer chip capacitors or inductors)  70   a ,  70   b ,  70   c ,  70   d ,  70   e ,  70   f ,  70   g ,  70   h ,  70   i ,  70   j ,  70   k ,  70   l ,  70   m ,  70   n ,  70   o , and  70   p  defining matching circuits are mounted on the front surface  52   a  of the wiring board  52 . 
         [0106]    As illustrated in  FIG. 11 , a conductive pattern is provided on the front surface  52   a  of the wiring board  52 . Broken lines in  FIG. 11  indicate the terminal portions of the duplexers  54  to  57  mounted on the front surface  52   a  of the wiring board  52 . As illustrated in  FIG. 11 , multiple pads including pads  61   t ′,  62   t ′,  65   t ′, and  68   t ′;  61   a ′,  62   a ′,  65   a ′, and  68   a ′;  61   p ′,  62   p ′,  65   p ′, and  68   p ′; and  61   q ′,  62   q ′,  65   q ′, and  68   q ′ connected to the duplexers  54  to  57  are provided on portions on which the broken lines are superposed on the conductive pattern provided on the front surface  52   a  of the wiring board  52 . In addition, pads connected to the chip components  70   a  to  70   d  and pads connected to the chip components  70   e  to  70   p  are provided on portions on which alternate long and short dash lines are superposed on the conductive pattern provided on the front surface  52   a  of the wiring board  52 . Furthermore, wiring patterns connected to theses pads are provided. 
         [0107]    The duplexer  54  includes an unbalanced input terminal and an unbalanced output terminal corresponding to the transmission filter for the band  1  and an unbalanced input terminal and balanced output terminals corresponding to the reception filter for the band  1 . The unbalanced input terminal corresponding to the transmission filter for the band  1  in the duplexer  54  is connected to the pad  61   t ′. One of the balanced output terminals corresponding to the reception filter for the band  1  in the duplexer  54  is connected to the pad  61   p ′ and the other thereof is connected to the pad  61   q ′. The unbalanced output terminal corresponding to the transmission filter for the band  1  in the duplexer  54  and the unbalanced input terminal corresponding to the reception filter for the band  1  in the duplexer  54  are connected to the pad  61   a′.    
         [0108]    The duplexer  55  includes an unbalanced input terminal and an unbalanced output terminal corresponding to the transmission filter for the band  5  and an unbalanced input terminal and balanced output terminals corresponding to the reception filter for the band  5 . The unbalanced input terminal corresponding to the transmission filter for the band  5  in the duplexer  55  is connected to the pad  65   t ′. One of the balanced output terminals corresponding to the reception filter for the band  5  in the duplexer  55  is connected to the pad  65   p ′ and the other thereof is connected to the pad  65   q ′. The unbalanced output terminal corresponding to the transmission filter for the band  5  in the duplexer  55  and the unbalanced input terminal corresponding to the reception filter for the band  5  in the duplexer  55  are connected to the pad  65   a′.    
         [0109]    The duplexer  56  includes an unbalanced input terminal and an unbalanced output terminal corresponding to the transmission filter for the band  2  and an unbalanced input terminal and balanced output terminals corresponding to the reception filter for the band  2 . The unbalanced input terminal corresponding to the transmission filter for the band  2  in the duplexer  56  is connected to the pad  62   t ′. One of the balanced output terminals corresponding to the reception filter for the band  2  in the duplexer  56  is connected to the pad  62   p ′ and the other thereof is connected to the pad  62   q ′. The unbalanced output terminal corresponding to the transmission filter for the band  2  in the duplexer  56  and the unbalanced input terminal corresponding to the reception filter for the band  2  in the duplexer  56  are connected to the pad  62   a′.    
         [0110]    The duplexer  57  includes an unbalanced input terminal and an unbalanced output terminal corresponding to the transmission filter for the band  8  and an unbalanced input terminal and balanced output terminals corresponding to the reception filter for the band  8 . The unbalanced input terminal corresponding to the transmission filter for the band  8  in the duplexer  57  is connected to the pad  68   t ′. One of the balanced output terminals corresponding to the reception filter for the band  8  in the duplexer  57  is connected to the pad  68   p ′ and the other thereof is connected to the pad  68   q ′. The unbalanced output terminal corresponding to the transmission filter for the band  8  in the duplexer  57  and the unbalanced input terminal corresponding to the reception filter for the band  8  in the duplexer  57  are connected to the pad  68   a′.    
         [0111]    As illustrated in  FIG. 12 , the wiring board  52  has a substantially rectangular front surface  52   a  and a substantially rectangular rear surface  52   b , which are parallel or substantially parallel to each other and which define a first main surface and a second main surface, and four side surfaces: first to fourth side surfaces  52   p ,  52   q ,  52   r , and  52   s . A conductive pattern is provided on the rear surface  52   b  of the wiring board  52 . Specifically, a transmission terminal  62   t  for the band  2 , a transmission terminal  61   t  for the band  1 , a transmission terminal  68   t  for the band  8 , and a transmission terminal  65   t  for the band  5  are arranged along the first side surface  52   p  of the wiring board  52 . An antenna terminal  61   a  for the band  1 , an antenna terminal  65   a  for the band  5 , an antenna terminal  68   a  for the band  8 , and an antenna terminal  62   a  for the band  2  are arranged along the second side surface  52   q  of the wiring board  52 . Reception terminals  62   p  and  62   q  for the band  2 , reception terminals  61   p  and  61   q  for the band  1 , reception terminals  68   p  and  68   q  for the band  8 , and reception terminals  65   p  and  65   q  for the band  5  are arranged along the third side surface  52   r  of the wiring board  52 . In addition, a shield pattern  64  is provided on the rear surface  52   b  of the wiring board  52 . 
         [0112]    The transmission terminal  61   t  for the band  1  corresponds to the Tx_A for the band  1  in  FIG. 9 . The transmission terminal  62   t  for the band  2  corresponds to the transmission terminal Tx_B for the band  2  in  FIG. 9 . The transmission terminal  65   t  for the band  5  corresponds to the transmission terminal Tx_A for the band  5  in  FIG. 9 . The transmission terminal  68   t  for the band  8  corresponds to the transmission terminal Tx_B for the band  8  in  FIG. 9 . 
         [0113]    The antenna terminal  61   a  for the band  1  corresponds to the antenna terminal Ant_A for the band  1  in  FIG. 9 . The antenna terminal  62   a  for the band  2  corresponds to the antenna terminal Ant_B for the band  2  in  FIG. 9 . The antenna terminal  65   a  for the band  5  corresponds to the antenna terminal Ant_A for the band  5  in  FIG. 9 . The antenna terminal  68   a  for the band  8  corresponds to the antenna terminal Ant_B for the band  8  in  FIG. 9 . 
         [0114]    The reception terminals  61   p  and  61   q , which are the balanced output terminals for the band  1 , correspond to the reception terminals Rx_A and Rx_B for the band  1  in  FIG. 9 . The reception terminals  62   p  and  62   q , which are the balanced output terminals for the band  2 , correspond to the reception terminals Rx_A and Rx_B for the band  2  in  FIG. 9 . The reception terminals  65   p  and  65   q , which are the balanced output terminals for the band  5 , correspond to the reception terminals Rx_A and Rx_B for the band  5  in  FIG. 9 . The reception terminals  68   p  and  68   q , which are the balanced output terminals for the band  8 , correspond to the reception terminals Rx_A and Rx_B for the band  8  in  FIG. 9 . 
         [0115]    Referring to  FIG. 11 , among the pads arranged at the side of the front surface  52   a  of the wiring board  52 , the pads electrically connected to the terminals at the side of the rear surface  52   b  of the wiring board  52  illustrated in  FIG. 12  are denoted by reference numerals including the addition of a slash (′) to the reference numerals of the terminals to which the pads are electrically connected. 
         [0116]    The wiring board  52  is manufactured preferably by laminating six conductive patterns  51   a  to  51   f  on five dielectric layers made of resin or ceramics, as illustrated in  FIG. 13A  to  FIG. 15B .  FIG. 13A  is a plan view of the first-layer conductive pattern  51   a  and corresponds to  FIG. 11 .  FIG. 13B  is a perspective view of the sixth-layer conductive pattern  51   f  and corresponds to  FIG. 12 .  FIG. 14A  is a perspective view of the second-layer conductive pattern  51   b .  FIG. 14B  is a perspective view of the third-layer conductive pattern  51   c .  FIG. 15A  is a perspective view of the fourth-layer conductive pattern  51   d .  FIG. 15B  is a perspective view of the fifth-layer conductive pattern  51   e . Black circles () in  FIG. 13A  to  FIG. 15B  indicate feed-through conductors electrically connecting the conductive patterns in the wiring board  52 . The black circles () in  FIG. 13B  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  51   f  and the conductive pattern  51   e . The black circles () in  FIG. 14A  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  51   b  to the conductive pattern  51   a . The black circles () in  FIG. 14B  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  51   c  to the conductive pattern  51   b . The black circles () in  FIG. 15A  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  51   d  to the conductive pattern  51   c . The black circles () in  FIG. 15B  indicate the positions of the feed-through conductors that electrically connect the conductive pattern  51   e  to the conductive pattern  51   d . The feed-through conductors are not illustrated in  FIG. 11  and  FIG. 12 . 
         [0117]    The conductive patterns connecting the pads and the terminals corresponding to the band  1  are shaded in  FIG. 13A  to  FIG. 15B . 
         [0118]    The conductive patterns formed in the wiring board  52  of the duplexer module of the comparative example include the wiring patterns, as illustrated in  FIG. 14B  and  FIG. 15B , in addition to shield patterns  63 ,  63   a , and  63   b . Routing the wiring patterns in the wiring board  52 , as in the duplexer of the comparative example, causes the wiring patterns to be lengthened which causes resistance loss. In addition, the wiring patterns are complicated and the routed wiring patterns are linked to each other which causes capacitive coupling between the ports. Accordingly, the insertion loss and the isolation are significantly degraded. In addition, since the structure of the wiring board  52  is complicated, it is difficult to decrease the number of dielectric layers in order to reduce the profile and to reduce the cost. 
         [0119]    In the duplexer modules  10  and  10   x  of the first and second preferred embodiments of the present invention described above, the transmission terminals are preferably adjacently arranged and the reception terminals are preferably adjacently arranged. In addition, the multiple output terminals are preferably commonly used in the reception filter unit including the multiple reception filters to simplify the wiring patterns on the wiring board, thus preventing the electrical characteristics from being degraded. 
         [0120]    The present invention is not limited to the above preferred embodiments and various modifications can be made. 
         [0121]    While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.