JP4307183B2 - Switch module and electronic device using the same - Google Patents

Description

  The present invention relates to a switch module used in a wireless device or the like and an electronic device using the same, and more particularly to a switch module having a plurality of different wireless communication systems and inputting / outputting signals of different frequencies. It relates to the electronic equipment used.

  With the development of information communication technology in recent years, communication networks have become established in society. In particular, a wireless local area network (LAN) using wireless communication technology transmits data wirelessly rather than by wire, so there is no need to install a signal transmission cable throughout the communication network. There is an advantage that construction is relatively easy and construction is possible at low cost.

  A plurality of standards exist in such a wireless LAN. For example, IEEE 802.11a using 5 GHz band, IEEE 802.11b using 2.4 GHz band, IEEE 802.11g, and the like can be mentioned. In general radio apparatuses, communication is generally performed using a frequency band corresponding to any one of the standards.

  However, recently, a dual band compatible device, which is a communication device compatible with a plurality of different standards and different wireless communication systems, has been proposed. For example, in an electronic device having a wireless LAN system compatible with IEEE802.11a and IEEE802.11b, communication can be performed in accordance with the frequency band of IEEE802.11a and the frequency band of IEEE802.11b. It is possible to switch between these depending on the situation.

  That is, when communication is impossible in one standard by performing communication in the frequency band of IEEE802.11a in some cases and communication in the frequency band of IEEE802.11b in other cases. In this case, communication can be performed in accordance with the other standard, and it is also possible to serve as a bridge between communication devices that support only one standard.

  The frequency band of the signals is 4.9 GHz to 5.825 GHz for the transmission signal Tx1 and the reception signal Rx1 of IEEE 802.11a, and the transmission signal Tx2 and the reception signal Rx2 of the IEEE 802.11b is 2.4 GHz to 2.4835 GHz.

  As an example of such an electronic device having a dual-band compatible wireless LAN system, a block diagram of an electronic device having a dual-band compatible wireless LAN having two types of systems compatible with a certain standard is shown in FIG. Reference 1).

  In FIG. 7, an electronic device having a conventional dual-band compatible wireless LAN generates or receives a switch module unit 100, four antennas 101a, 101b, 102a, 102b for transmitting and receiving signals, and a transmission signal Tx1. A transmission / reception circuit 103 that receives the signal Rx1 and a transmission / reception circuit 104 that generates the transmission signal Tx2 and receives the reception signal Rx2.

  The antennas 101a and 101b transmit and receive signals in the frequency band of IEEE.802.11a, and the antennas 102a and 102b transmit and receive signals in the frequency band of IEEE.802.11b. In addition, since the wireless LAN system employs a diversity system that uses a plurality of antennas and uses the more sensitive one, it is necessary to use two antennas for the same system, and therefore, a total of four antennas are used. ing.

  The switch module 100 includes a switch 105 and a switch 106. The switch 105 selects the antenna 101a and the antenna 101b having the higher sensitivity, and transmits to the transmission side of the transmission / reception circuit 103. When receiving, the switch 105 receives the transmission side. It has a function to change the switch. Similarly, the switch 106 has a function of selecting the antenna 102a and the antenna 102b having better sensitivity, and switching the switch to the transmission side of the transmission / reception circuit 104 at the time of transmission and to the reception side of the transmission / reception circuit 104 at the time of reception. .

  Such an electronic device is a dual-band wireless LAN system in which two systems are simply arranged, so that it is relatively easy to construct the system, but it occupies the entire electronic device. Since four antennas having a large ratio are used, there is a problem that it is difficult to reduce the outer shape of the electronic device.

  Therefore, an electronic apparatus having a dual-band compatible wireless LAN system as shown in FIG. 8 has been proposed. In the electronic device having the dual-band wireless LAN system of FIG. 8, two antennas 101c and 102c for transmitting and receiving signals, a transmission and reception circuit 103 for generating a transmission signal Tx1 and receiving a reception signal Rx1, and a transmission signal A transmission / reception circuit 104 that generates Tx2 and receives a reception signal Rx2. The switch module 100 includes duplexers 107 and 108 and switches 105 and 106. Here, since the antennas 101c and 102c transmit and receive signals in both frequency bands, a duplexer is used to separate the signals transmitted and received by the antennas 101c and 102c by the switch module 100 into signals of two standard frequency bands. 107 and 108 are connected between the antennas 101c and 102c and the switches 105 and 106, and signals transmitted and received by the antennas 101c and 102c are separated into signals of individual standards.

  For example, the signals transmitted and received by the antennas 101c and 102c are separated into only signals in the frequency band of the transmission signal Tx1 and the reception signal Rx1 by the duplexers 107 and 108, and the frequency of the transmission signal Tx1 and the reception signal Rx1 is transmitted to the switch 105. Only the signal of the band comes.

In an electronic device having such a dual band compatible wireless LAN system, the antennas 101c and 102c can transmit and receive signals in both frequency bands of the IEEE 802.11a and IEEE 802.11b standards. Compared to the electronic device shown in FIG. 7, the number of antennas can be reduced to two, and the outer shape of the electronic device can be reduced.
JP2003-188761A

  However, in the electronic device having the conventional dual-band compatible wireless LAN system shown in FIG. 8, since a duplexer is newly provided, the number of parts is increased and it is difficult to cope with further downsizing.

  Further, in the switch module shown in FIG. 8, since the switch needs a control signal for control, it is necessary to control two switches to switch the system, and the system switching control becomes complicated. There was also a problem.

  Further, the electronic device having the dual-band compatible wireless LAN system of FIG. 8 has two types of wireless LAN systems. However, when a system with a different standard is newly added, the switch module of FIG. Since one switch for transmission / reception is required for one system, it is necessary to further include a switch for switching transmission / reception according to the number of newly added systems. As a result, similar to the installation of the branching filter described above, the number of parts increases and the mounting area increases, and there is a problem that it is impossible to reduce the size, thickness, and weight.

  In addition, it is necessary to change the duplexer from one that separates a signal into two frequency bands to one that separates a signal into three or more frequency bands.

  Further, in response to demands for miniaturization, thickness reduction, and weight reduction, there is a problem that isolation between the duplexers decreases when the duplexers are brought close to each other. For example, in the electronic device of FIG. 8, since a duplexer is connected between the antenna and the switch, when the duplexers are brought close to each other, the isolation between the duplexers is low. When the signal is transmitted at, the signal passing through the demultiplexer 107 is moved to the demultiplexer 108, the output of the signal transmitted by the antenna 101C is reduced, and the signal is transmitted as noise from the antenna 102C. There was a problem.

  The present invention has been completed in view of the above-described problems of the prior art, and its purpose is that it can be reduced in size, thickness, and weight, can be easily controlled, and a plurality of systems can be controlled. It is an object of the present invention to provide a switch module and an electronic device using the same, which can use a wireless communication system of the above and can improve isolation of a duplexer.

Accordingly, the present invention has the following configuration.

The switch module of the present invention has a transmission side duplexer having a plurality of input terminals and one transmission terminal, a reception side duplexer having a plurality of output terminals and one reception terminal, and a switch, The transmission-side duplexer, the reception-side duplexer, and the switch are provided on a substrate having a plurality of layers, and the transmission-side duplexer is disposed inside the substrate. A plurality of conductor patterns provided, wherein the reception-side duplexer is provided inside the substrate, and each of the plurality of conductor patterns corresponds to the conductor pattern of the transmission-side duplexer. And the switch is electrically connected to a ground electrode formed in the first layer of the substrate via a through conductor formed in the substrate, and the transmission-side duplexer and the conductor path a corresponding receiving-side demultiplexer of the Over down each other, have the same shape is provided in an identical layer other than the first layer of said, the substrate in plan view, are formed in point symmetry about said feed-through conductors Yes.

In the switch module according to the present invention, preferably, the switch has a plurality of antenna terminals.

  The electronic device of the present invention is an electronic device having an antenna and a transmission / reception circuit unit electrically connected to the antenna, and the transmission / reception circuit unit has the switch module of the present invention.

  In the switch module of the present invention, a transmission-side duplexer having a plurality of input terminals and one transmission terminal, a reception-side duplexer having a plurality of output terminals and one reception terminal, and a switch are mounted on a substrate. Since the transmission-side duplexer and the reception-side duplexer are arranged symmetrically with respect to the switch when the substrate is viewed in plan, a control signal for system switching control is required. Since the number of switches can be reduced, the module can be reduced in size, and the switching control to the antenna terminal can be performed by one switch, so that the switching control can be facilitated. In addition, the number of parts of the transmission-side duplexer and the reception-side duplexer is not increased because it is divided into signals for each system, and the input terminal of the transmission-side duplexer and the output terminal of the reception-side duplexer are expanded. Only a new system can be added.

  In addition, since a switch is arranged between the antenna terminal and the duplexer, the signal leakage of the duplexer is blocked by the switch and hardly affects the antenna terminal. It becomes difficult to output. In addition, since the transmission-side duplexer and the reception-side duplexer are arranged symmetrically with respect to the switch, the distance between the transmission-side duplexer and the reception-side duplexer can be increased. Isolation between the side duplexer and the reception duplexer is improved, and signal leakage is reduced.

  In the switch module according to the present invention, in the above configuration, the transmission-side duplexer and the reception-side duplexer are built in the substrate, and the switch is mounted on the main surface of the substrate. Since it is electrically connected to the ground electrode formed inside the substrate through the through conductor formed in the substrate, the transmission side duplexer and the reception side duplexer are built in the substrate for transmission. The side duplexer, the reception duplexer, and the switch can be easily electrically connected, and the size can be reduced. In addition, by forming a through conductor between the transmission-side duplexer and the reception-side duplexer, the transmission-side duplexer and the reception-side duplexer are separated from each other by a ground electrode. Can be improved.

  In addition, since the switch module of the present invention has a plurality of antenna terminals in the above-described configuration, the most sensitive antenna can be selected and used, so that more stable communication is possible. In addition, by connecting an antenna capable of transmitting and receiving signals having different frequency bands to a plurality of antenna terminals, the antenna can be used properly according to the system to be used.

  The electronic device of the present invention is an electronic device having an antenna and a transmission / reception circuit unit electrically connected to the antenna, and the transmission / reception circuit unit includes the switch module of the present invention. Can be used to reduce the size, thickness, and weight of electronic devices, facilitate system switching control, and use multiple wireless communication systems. The isolation between the transmitter and the receiving duplexer can be improved.

  The switch module of the present invention will be described below with reference to the drawings. In the following embodiment, a switch module used in a dual band system of IEEE 802.11a and IEEE 802.11b will be described.

  FIG. 1 is a block diagram showing an example of an embodiment of a switch module of the present invention. In FIG. 1, 1 is a switch, 2 is a transmission side duplexer, 3 is a reception side duplexer, 4a is a first antenna terminal, 4b is a second antenna terminal, 5 is a first switch terminal, and 6 is The second switch terminal, 7 is a transmission terminal, 8 is a reception terminal, 9a is a first input terminal, 9b is a second input terminal, 10a is a first output terminal, and 10b is a second output terminal. Further, the control terminal for switching the switch is omitted.

  The switch module shown in FIG. 1 includes a switch 1, a transmission-side duplexer 2, and a reception-side duplexer 3. The switch 1 includes a first antenna terminal 4a, a second antenna terminal 4b, and a first antenna. A switch terminal 5 and a second switch terminal 6 are provided. The transmission side duplexer 2 has a transmission terminal 7, a first input terminal 9a, and a second input terminal 9b. The reception side duplexer 3 has a reception terminal 8, a first output terminal 10a, and a second input terminal 9b. Output terminal 10b. Then, the first switch terminal 5 and the transmission terminal 7 and the second switch terminal 6 and the reception terminal 8 are electrically connected to form a switch module.

  Here, the operating frequency band of the switch 1 is the frequency band of the system to be used, and the transmission signal Tx1 is input from the first input terminal 9a and the transmission signal Tx2 is input from the second input terminal 9b. Conversely, the reception signal Rx1 is output from the first output terminal 10a, and the reception signal Rx2 is output from the second output terminal 10b. The switch 1 switches to the first switch terminal 5 during transmission, and switches to the second switch terminal 6 during reception. One of the first switch terminal 5 and the second switch terminal 6 is connected to the higher receiving sensitivity of the first antenna terminal 4a and the second antenna terminal 4b.

  For example, when transmitting the transmission signal Tx1 from the first input terminal 9a to the first antenna terminal 4a, the transmission signal Tx1 is input from the first input terminal 9a and passes through the transmission-side duplexer 2 to transmit terminal 7 Is output. In this case, the transmission signal Tx1 does not leak to the second input terminal 9b. The switch 1 connects the first antenna terminal 4 a and the first switch terminal 5. In this case, the transmission signal Tx1 does not leak to the second switch terminal 6. The transmission signal Tx1 is output to the antenna via the first antenna terminal 4a.

FIG. 2 shows a circuit diagram of a specific example of the embodiment of the switch module of the present invention. In FIG. 2, the same parts as those in FIG. In FIG. 2, the transmission-side duplexer 2 has inductors L1 and L2 and capacitors C1 to C5. In the path connecting the transmission terminal 7 and the first input terminal 9a, one end of the capacitor C1 and one end of the capacitor C2 are electrically connected, and the connection point and one end of the inductor L1 are electrically connected. The other end and one end of the capacitor C3 are connected in series. The other end of the capacitor C3 is grounded. With this configuration, a high-pass filter that allows the transmission signal Tx1 to pass through the path connecting the transmission terminal 7 and the first input terminal 9a but does not pass the transmission signal Tx2 can be obtained. On the other hand, in the path connecting the transmission terminal 7 and the second input terminal 9a, the inductor L2 and the capacitor C4 are connected in parallel, and one end thereof is grounded via the capacitor C5. With this configuration, a low-pass filter that allows the transmission signal Tx2 to pass through and does not pass the transmission signal Tx1 in the path connecting the transmission terminal 7 and the second input terminal 9a can be obtained. Has inductors L1a and L2a and capacitors C1a to C5a, but since it is the same circuit as the transmission side duplexer 2 and is connected in the same way, the description thereof is omitted.

  FIG. 3 shows an example of a specific configuration of the switch module of FIG. In FIG. 3, 11 to 16 are first to sixth dielectric layers, 17 is a ground electrode, 18 is a cavity, 19 is a mounting pad, 20a is a transmission electrode, 20b is a reception electrode, and 21a to 24a are transmission side demultiplexing. First to fourth capacitive electrodes of the transmitter, 21b to 24b are the first to fourth capacitive electrodes of the receiving-side duplexer, 25a and 26a are the first and second grounded capacitive electrodes of the transmitting-side duplexer, 25b and 26b are first and second grounded capacitance electrodes of the transmission-side branching filter, 27a to 30a are first to fourth strip lines of the transmission-side branching filter, and 27b to 30b are first numbers of the receiving-side branching filters. 1st to 4th strip lines, 31 is a through conductor, 32a to 36a are 1st to 5th through conductors of a transmission side duplexer, and 32b to 36b are 1st to 5th through conductors of a reception side duplexer , 37a and 38a are first and second input electrodes, 37b and 38b are first and second output electrodes, 39 is a first antenna electrode, 40 is a second antenna electrode, and 41 is a switching IC.

  In FIG. 3, the first capacitive electrode 21a of the transmission-side duplexer formed between the first dielectric layer 11 and the second dielectric layer 12, the second dielectric layer 12 and the third dielectric layer 12 A capacitance generated between the third capacitive electrode 23a of the transmission side duplexer formed between the dielectric layers 13 is defined as C1. Further, the second capacitive electrode 22a of the transmission-side duplexer formed between the first dielectric layer 11 and the second dielectric layer 12, the second dielectric layer 12 and the third dielectric A capacitance generated between the third capacitive electrode 23a of the transmission-side duplexer formed between the layers 13 is defined as C2.

  The first stripline 27a of the transmission-side duplexer formed between the third dielectric layer 13 and the fourth dielectric layer 14, the fifth dielectric layer 15 and the sixth dielectric layer The second strip line 28a of the transmission-side duplexer formed between the first strip line 27a and the first strip line 27a and the second strip line 28a of the transmission-side duplexer are connected between the second strip line 28a and the second strip line 28a. Let L1 be an inductor generated by electrical connection through the second through conductor 33a of the transmission-side duplexer that passes through the dielectrics 12-15.

  Further, it is formed on the first grounded capacitive electrode 25a of the transmission side duplexer formed between the fifth dielectric layer 15 and the sixth dielectric layer 16, and on the lower surface of the sixth dielectric layer 16. The other end of the first stripline 27 of the transmission-side duplexer is the third of the transmission-side duplexer penetrating the third dielectric 13 when the grounded capacitance electrode generated between the grounding electrode 17 and C3 is C3. The second strip line 28a of the transmission-side duplexer and the first ground of the transmission-side duplexer are electrically connected to the third capacitive electrode 23a of the transmission-side duplexer via one through conductor 32a. By electrically connecting the capacitor electrode 25a, a high-pass filter composed of C1, C2, C3, and L1 that performs series resonance is formed.

  In addition, the fourth capacitive electrode 24a of the transmission side duplexer formed between the fourth dielectric layer 14 and the fifth dielectric layer 15, the fifth dielectric layer 15 and the sixth dielectric material The capacitance generated between the second grounded capacitive electrode 26a of the transmission side duplexer formed between the layers 16 is C4. Also, a third strip line 29a of the transmission-side duplexer formed between the first dielectric layer 11 and the second dielectric layer 12, and the second dielectric layer 12 and the third dielectric The fourth stripline 30a of the transmission-side duplexer formed between the layers 13 and one end of the third stripline 29a and the fourth stripline 30a of the transmission-side duplexer are connected to the second dielectric. An inductor generated by electrical connection through the third through conductor 34a penetrating the body 12 is denoted as L2.

  Further, the second grounded capacitance electrode 26 a of the transmission-side duplexer formed between the fifth dielectric layer 15 and the sixth dielectric layer 16 and the lower surface of the sixth dielectric layer 16 are formed. When the grounded capacitance electrode formed between the grounding electrode 17 and the grounding electrode 17 is C5, the other end of the third strip line 29a of the transmission side duplexer passes through the second to fourth dielectrics 12-14. The other end of the fourth strip line 30a of the transmission side duplexer is electrically connected to the fourth capacitive electrode 24a of the transmission side duplexer via the through conductor 35a of the transmission side duplexer. From C4, C5, and L2 by being electrically connected to the second grounded capacitive electrode 26a of the transmission-side duplexer via the 5a through-conductor 36a of the transmission-side duplexer that passes through 13 to 15 A low-pass filter having parallel resonance is configured.

  Then, the third strip line 29a of the transmission-side duplexer is electrically connected to the first capacitive electrode 21a of the transmission-side duplexer and the transmission electrode 20a, and the second capacitive electrode of the transmission-side duplexer is connected. 22a and the first input electrode 37a are electrically connected, and the second grounded capacitance electrode 28a and the second input electrode 38a of the transmission-side duplexer are electrically connected, so that the transmission side shown in FIG. This is the duplexer 2.

  Although omitted here, the same connection is made, and the third strip line 29b of the receiving-side duplexer is electrically connected to the first capacitive electrode 21b and the receiving electrode 20b of the receiving-side duplexer to receive the signal. The second capacitor electrode 22b of the side duplexer and the first output electrode 37b are electrically connected, and the second ground capacitor electrode 28b and the second output electrode 38b of the receive duplexer are electrically connected. By connecting to, the receiving side duplexer 3 is obtained. Then, the switching IC 41 is mounted on the mounting pad 19 in the cavity 18, and the first antenna electrode 39 and the second antenna electrode 40 are electrically connected to the switching IC 41, respectively, and the transmission electrode 20a and the reception electrode The switch module of the present invention can be obtained by electrically connecting 20b to the switching IC 41.

  The first to sixth dielectric layers 11 to 16, the first to fourth capacitive electrodes 21a to 24a of the transmission side duplexer, the first to fourth capacitive electrodes 21b to 24b of the reception side duplexer, and the transmission The capacitors C1 to C5 and C1a to C5a are adjusted by the first and second grounded capacitive electrodes 25a and 26a of the side duplexer and the first and second grounded capacitive electrodes 25b and 26b of the receiver duplexer, and By adjusting the inductances L1, L2 and L1a, L2a by the first to fourth strip lines 27a to 30a of the transmission side duplexer and the first to fourth strip lines 27b to 30b of the reception side duplexer, A duplexer having a desired demultiplexing characteristic can be obtained.

  Further, the switch module of the present invention includes the transmission side duplexer 2, the reception side duplexer 3, and the switch 1, thereby reducing the number of switches that require a control signal for system switching control. Therefore, it is possible to reduce the size, and it is possible to control switching to the first and second antenna terminals 4a and 4b with a single switch, thereby facilitating switch switching control. Further, since the switch 1 is disposed between the first and second antenna terminals 4a and 4b, the transmission-side duplexer 2 and the reception-side duplexer 3, noise is caused by the first and second antenna terminals 4a and 4a. It is difficult to output to 4b. In addition, the transmission-side duplexer 2 and the reception-side duplexer 3 are arranged symmetrically with respect to the switch 1 so that the distance between the transmission-side duplexer 2 and the reception-side duplexer 3 is set. Therefore, the isolation between the transmitting side and the receiving side can be improved, and signal leakage is reduced.

  In the present invention, the transmission-side duplexer 2 and the reception-side duplexer 3 are arranged point-symmetrically around the switch 1, but the point-symmetrical center point can be the center point of the switch 1. . The center point of the switch 1 can be the geometric center point or the center of gravity of the switch 1.

  In the switch module of the present invention, the transmission side duplexer 2 and the reception side duplexer 3 are preferably built in the substrate, the switch 1 is mounted on the main surface of the substrate, and the switching IC 41 is located inside the substrate. The transmission side duplexer 2, the reception side duplexer 3, and the switching IC 41 can be easily electrically connected to each other by being electrically connected to the ground electrode 17 through the through conductor 31 formed in the above. As well as being able to be miniaturized. Further, by forming the through conductor 31 between the transmission side duplexer 2 and the reception side duplexer 3, the transmission side duplexer 2 and the reception side duplexer 3 are connected to the ground electrode 17. Thus, the isolation between the transmission-side duplexer 2 and the reception-side duplexer 3 is improved.

FIG. 4 is a graph showing frequency characteristics of the transmission-side duplexer of the switch module of the present invention shown in FIG. In FIG. 4, the horizontal axis represents the frequency (unit: GHz), the vertical axis represents the signal passing amount S (2, 1) (unit: dB) of the second output terminal, and the solid characteristic curve represents the switch of the present invention. The frequency characteristic of the transmission side duplexer of the module, and the frequency characteristic of the broken line indicate the frequency characteristics of the transmission side duplexer when isolation between the duplexers is low. From 2.4 GHz to 2.4835 GHz From the result of FIG. 4, according to the switch module of the present invention, since the isolation between the duplexers is high, the signal is attenuated in the frequency band (2.4 GHz to 2.4835 GHz) of the transmission signal Tx2. However, it can be seen that, on the contrary, in the transmission-side branching filter with low isolation between the branching filters, the signal is attenuated in the frequency band of the transmission signal Tx2.

  In the switch module of the present invention, when the dielectric layer is made of ceramics, for example, a ceramic green sheet (hereinafter also referred to as a green sheet) that becomes each dielectric layer after firing is subjected to predetermined perforation processing and each electrode It is manufactured by applying a conductive paste to the pattern shape and through holes to be through conductors, the side surfaces of the green sheet, and the like, and laminating and baking them. Alternatively, when the dielectric layer is made of a resin such as a fluororesin, a glass epoxy resin, or a polyimide resin, a resin substrate is used and the copper foil deposited on the surface is etched to form each electrode pattern. It is manufactured by forming a through conductor for connection and laminating and pressing.

  The dielectric layers including the first to sixth dielectric layers 11 to 16 include ceramic materials such as alumina ceramics and mullite ceramics, inorganic materials such as glass ceramics, or tetrafluoroethylene resin (polytetra PTFE), tetrafluoroethylene-ethylene copolymer resin (tetrafluoroethylene-ethylene copolymer resin; ETFE), tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (tetrafluoroethylene-perfluteroalkyl vinyl ether) Fluorine resin such as copolymer resin (PFA), glass epoxy resin, resin material such as polyimide, or the like is used.

Also, the ground electrode 17, the first to fourth capacitive electrodes 21a to 24a of the transmission side duplexer, the first to fourth capacitive electrodes 21b to 24b of the reception side duplexer, and the first and first of the transmission side duplexer. 2 ground capacitance electrodes 25a and 26a, first and second ground capacitance electrodes 25b and 26b of the receiving-side duplexer, first to fourth strip lines 27a to 30a of the transmitting-side duplexer and receiving-side branching Conductor layers made of a metal material for high-frequency signal transmission are used for the first to fourth strip lines 27b to 30b of the device. For example, Cu layer, Mo-Mn metallized layer with Ni plated layer and Au plated layer deposited, W Metallized layer with Ni plated layer and Au plated layer deposited, Cr-Cu Alloy layer, Ni—Cr layer and Au plating layer deposited on Cr—Cu alloy layer, Ni—Cr alloy layer and Au plating layer deposited on Ta ₂ N layer, Ti layer Thick film printing methods or various thin film forming methods and platings using a Pt layer and Au plating layer deposited, or a Pt layer and Au plating layer deposited on a Ni-Cr alloy layer, etc. It is formed by law. The thickness and width are set according to the frequency and application of the transmitted high-frequency signal.

  Next, FIG. 5 shows a block diagram of another example of the embodiment of the switch module of the present invention. The following description is about a switch module used in a triple band system of IEEE 802.11a, IEEE 802.11b, and PDC (Personal Digital Cellular). The PDC transmission signal Tx3 is a frequency band from 925 MHz to 960 MHz, and the PDC reception signal Rx3 is a frequency band from 810 MHz to 926 MHz. In FIG. 5, 1a is a switch, 2a is a transmission side duplexer, 3b is a reception side duplexer, 4a is a first antenna terminal, 4b is a second antenna terminal, 4c is a third antenna terminal, 1st switch terminal, 6 is 2nd switch terminal, 7 is transmitting terminal, 8 is receiving terminal, 9a is 1st input terminal, 9b is 2nd input terminal, 9c is 3rd input terminal, 10a is A first output terminal, 10b is a second output terminal, and 10c is a third output terminal. Since these connections are the same as those in FIG.

  Further, in the switch module of the present invention, the transmission-side duplexer 2 and the reception-side duplexer 3 divide signals for each system, so that the third input terminal 9c and the third output terminal 19c as shown in FIG. Can be easily changed without increasing the number of parts by changing to two types of frequency bands from the two types of frequency bands, such as the transmitting side demultiplexer 2a and the receiving side demultiplexer 3b. It is possible to add a new system.

  In the switch module of the present invention, it is preferable to connect the antenna to a plurality of antenna terminals, so that the most sensitive one can be used, so that more stable communication is possible. In addition, by connecting antennas that transmit and receive signals having different frequencies to a plurality of antenna terminals, it is possible to use different antennas depending on the system to be used.

  Next, FIG. 6 shows an example of an embodiment of an electronic apparatus of the present invention. In FIG. 6, the portion surrounded by a broken line is the switch module described in FIG. 1, 42a is the first antenna, 42b is the second antenna, 43 is the transmission circuit, and 44 is the reception circuit. The description of the switch module is omitted here. The first antenna terminal 4a and the first antenna 42a are electrically connected, and the second antenna terminal 4b and the second antenna 42b are electrically connected. The first and second input terminals 9 a and 9 b are electrically connected to the transmission circuit 43, and the first and second output terminals 10 a and 10 b are electrically connected to the transmission circuit 44.

  According to the electronic device of the present invention, by using the switch module of the present invention for the transmission / reception unit, the electronic device can be reduced in size, thickness, and weight, and control of system switching is easy. A plurality of wireless communication systems can be used, and the isolation of the duplexer can be improved.

  In addition, this invention is not limited to the example of the above embodiment, A various change may be added in the range which does not deviate from the summary of this invention. For example, in a substrate with a built-in duplexer, the first to sixth dielectric layers 11 to 16 are thinned, a high dielectric constant material is used for them, or the first to fourth dielectric layers 11 to 11 are used. Further downsizing is possible by mixing a magnetic material with 14. In addition, the switching IC 41 is mounted in the cavity 18 in the substrate with the built-in duplexer. However, the switching IC 41 may be directly mounted on the substrate without the cavity 18, and may be mounted on the lower surface of the substrate instead of mounting on the upper surface of the substrate. It may be implemented.

  In the example of FIG. 2, the transmission duplexer 2 and the reception duplexer 3 are configured by a high-pass filter and a low-pass filter. A combination of a filter and a bandpass filter may be used. The system used may be not only a wireless LAN but also AMPS (Advanced Mobile Phone Service: 824 MHz to 894 MHz), W-CDMA (Wide Band Code Division Multiple Access: 1920 MHz to 2200 MHz), or the like.

  And as an electronic device in which the switch module of the present invention is mounted, not only a mobile phone, a PDA, a PC card, and an access point, but also an AV device such as a TV, a household electronic device such as a microwave oven, a refrigerator, and a rice cooker Good.

It is a block diagram which shows an example of embodiment of the switch module of this invention. It is a circuit diagram of the switch module of FIG. It is a disassembled perspective view which shows the specific structure of the switch module of FIG. 4 is a graph showing frequency characteristics of a transmission-side duplexer of the switch module of FIG. 3. It is a block diagram which shows the other example of embodiment of the switch module of this invention. It is a block diagram which shows an example of embodiment of the electronic device of this invention. It is a block diagram which shows an example of the electronic device which has the conventional dual band corresponding | compatible wireless LAN function. It is a block diagram which shows the other example of the electronic device which has the conventional dual band corresponding | compatible wireless LAN function.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a: Switch 2, 2a: Transmission side duplexer 3, 2a: Reception side duplexer 4a-4c: 1st-3rd antenna terminal 5: 1st switch terminal 6: 2nd switch terminal 7 : Transmission terminal 8: Reception terminals 9a to 9c: First to third input terminals
10a to 10c: first to third output terminals
17: Ground electrode
20a: Transmitter electrode
20b: Reception electrode
31: Through conductor
43: Transmitter circuit
44: Receiver circuit

Claims (3)

A transmission side duplexer having a plurality of input terminals and one transmission terminal; a reception side duplexer having a plurality of output terminals and one reception terminal; and a switch, the transmission side duplexer, The receiving-side duplexer and the switch are switch modules provided on a substrate composed of a plurality of layers,
The transmission-side duplexer has a plurality of conductor patterns provided inside the substrate, and the reception-side duplexer is provided inside the substrate, each of which is the transmission-side duplexer. Having a plurality of conductor patterns corresponding to the conductor patterns;
The switch is electrically connected to a ground electrode formed in the first layer of the substrate through a through conductor formed in the substrate,
Corresponding the conductor patterns of the said transmitting-side demultiplexer and the receiving branching filter is a same shape is provided in an identical layer other than the first layer, when the substrate is viewed in plane And a switch module formed symmetrically with respect to the through conductor. The switch module according to claim 1 , wherein the switch has a plurality of antenna terminals.   3. An electronic device having an antenna and a transmission / reception circuit unit electrically connected to the antenna, wherein the transmission / reception circuit unit includes the switch module according to claim 1.

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