JPWO2014203808A1 - Wireless communication device - Google Patents

Abstract

The wireless communication device 121 includes an electronic circuit unit 100, a duplexer 120, and an antenna. The electronic circuit unit 100 includes a first magnetic body 108 and a first magnet 114 that forms a first isolator together with the first magnetic body 108. The duplexer 120 includes a third magnetic body 107. The duplexer 120 is disposed on the electronic circuit unit 100, the first magnet 114 is positioned between the first magnetic body 108 and the third magnetic body 107, and the third magnetic body 107 is A third isolator is formed together with the first magnet 114.

Description

  The present invention relates to a wireless communication device, and more particularly to a wireless communication device including an electronic circuit unit and a duplexer.

  In a wireless communication apparatus using an FDD (Frequency Division Duplex) system, frequency assignment to transmission bands and reception bands is opposite in an opposite apparatus. In such an apparatus, isolation between two frequency bands used for transmission / reception is ensured by an isolator provided in the transmission circuit, an isolator provided in the reception circuit, and a filter for each band. However, if the two frequency bands are close, it may be difficult to ensure isolation. Patent Document 1 discloses a method using a circulator for ensuring isolation.

  In a wireless communication device using a high frequency band (for example, a microwave), a waveguide for transmitting a transmission / reception signal (electromagnetic wave) is provided between an antenna and a transmitter / receiver. The circulator is provided in a part of the waveguide, and has a reception port, a transmission port, and an antenna port. A receiver is connected to the reception port via a filter, a transmitter is connected to the transmission port via a filter, and an antenna is connected to the antenna port. The transmission signal from the transmitter is input to the circulator via the transmission filter, and the circulator outputs to the antenna port. The received signal from the antenna port is input to the circulator and output to the receiver side through the reception filter. Between these circulators, a transmitter, a receiver, and an antenna, a waveguide having a predetermined length is provided. In the center of the circulator, a coupling portion of three ports is provided, and this coupling portion is provided with a magnetic body (ferrite or the like) for transmitting electromagnetic waves transmitted and received from the port in one direction. In the coupling portion, a matching stub is provided in the vicinity of the magnetic body, and a predetermined isolation is ensured between transmission and reception of electromagnetic waves.

JP 2001-060807 A

  However, in the case where a total of two filters are used and a circulator is provided in the waveguide connecting the antenna and the filter, the waveguide between the antenna and the filter becomes a cost increase factor.

  Also, a transmission filter is integrally provided at the transmission port of the circulator, and a reception filter is integrally provided at the reception port, so that the two filters and the circulator are integrated, and the duplexer is integrated. The case of forming is also conceivable.

  The duplexer is also called a duplexer or an antenna duplexer, and separates transmission signals and reception signals having different frequencies. The duplexer includes an antenna terminal, a transmission side terminal, a reception side terminal, a transmission filter, and a reception filter. The transmission signal input from the transmission side terminal passes through the transmission filter, and a signal in a predetermined frequency band is output from the antenna terminal. Also, the reception signal input from the antenna terminal passes through the reception filter, and a signal in a predetermined frequency band is output from the reception side terminal.

  In this case, the waveguide between the antenna and the filter is taken into the duplexer. However, since the circulator inside the duplexer is directional, the same duplexer cannot be used for the opposing electronic circuit units, and two types of duplexers must be prepared, which increases costs.

  An object of the present invention is to provide a wireless communication apparatus that can secure isolation even when a transmission band and a reception band are close to each other and can reduce costs.

  The wireless communication device is a wireless communication device having an electronic circuit unit, a duplexer, and an antenna, and the electronic circuit unit is provided on a wireless communication circuit and an input circuit side of the wireless communication circuit. A first magnetic body; a second magnetic body provided on an output circuit side of the wireless communication circuit; a first magnet that forms a first isolator together with the first magnetic body; and A second magnet that forms a second isolator together with the magnetic body, and the duplexer is provided between an antenna terminal, a transmission side terminal, a reception side terminal, and the antenna terminal and the reception side terminal. A third magnetic body provided, and a fourth magnetic body provided between the transmission side terminal and the antenna terminal, wherein the antenna is connected to the antenna terminal, and the duplexer Is The first magnet and the second magnet are disposed on the electronic circuit unit, and are respectively between the first magnetic body and the third magnetic body and between the second magnetic body and the second magnet. The third magnetic body forms a third isolator together with the first magnet, and the fourth magnetic body forms a third isolator together with the second magnet. 4 isolators are formed.

  According to the present invention, it is possible to provide a wireless communication apparatus that can secure isolation and suppress cost even when the transmission band and the reception band are close to each other.

It is the figure which showed a part of cross section of the radio | wireless communication apparatus in this invention. It is the figure which showed the printed circuit board of the electronic circuit part in this invention. It is the figure which showed the internal structure of the duplexer in this invention.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

  FIG. 1A is a diagram showing a part of a cross section of a wireless communication apparatus 121 having an electronic circuit unit 100 and a duplexer 120, and shows a state of connection between the electronic circuit unit 100 and the duplexer 120.

  The conductors 103a, 103b, and 104 are conductors that constitute the electronic circuit unit 100. The waveguide 122 of the electronic circuit unit 100 is formed by these conductors. A printed circuit board 105 is sandwiched between the conductor 103b and the conductor 104, and is fixed by screws 118. The conductor 103b and the conductor 104 shield a wireless communication circuit provided on one surface side of the printed board 105. The present invention is the same for both the input circuit side 210 in which a signal is input from the input side terminal to the radio communication circuit 209 and the output circuit side 211 in which a signal is output from the radio communication circuit 209 to the output side terminal. In FIG. 1A, only the part on the input circuit side 210 is shown.

  The printed circuit board 105 is provided with a transmission line by a strip line, and a first transducer 106 is formed by a copper foil pattern. An electrical signal is transmitted from the waveguide 123 of the duplexer 120 to the strip line by the first transducer 106. A first magnetic body 108 and spacers 111 and 112 are provided inside the waveguide 122 of the electronic circuit unit 100, and constitute a first magnet 114 and a first isolator 202. The magnetic body is typically formed from ferrite. The first magnet 114 is fixed to the conductor 103a with an adhesive 115. The spacer 113 is installed on the first magnet 114 to ensure characteristics. The duplexer 120 is positioned by the convex portion 119 formed on the conductor 103b, and the screw 116 penetrates the filter module and is fixed by being squeezed by the conductor 103b on the electronic circuit portion 100 side.

  The conductors 101, 102 a, and 102 b are conductors constituting the duplexer 120. A waveguide 123 is formed by these conductors. A third magnetic body 107 and spacers 109 and 110 are provided inside the waveguide 123, and constitute a first magnet 114 and a third isolator 302. This is possible because the first magnet 114 is positioned between the first magnetic body 108 and the third magnetic body 107. The conductor 101 and the conductor 102b are fixed by the screw 117.

  As described above, the first magnetic body 108 forms the first isolator 202 together with the first magnet 114, and the third magnetic body 107 forms the third isolator 302 together with the first magnet 114. As described above, since one magnet 114 is shared by the two magnetic bodies 107 and 108, the number of expensive magnets can be reduced by one, which is effective for cost reduction. In addition, by combining the first isolator 202 on the electronic circuit unit 100 side and the third isolator 302 on the duplexer 120 side, isolation is ensured even when the two frequency bands used for transmission and reception are close to each other. it can.

  As described above, the input circuit side of the printed circuit board 105 has been described based on FIG. 1A, but the same can be said for the output circuit side as shown in FIG. Corresponding to the first magnet 114, the first magnetic body 108, the third magnetic body 107, the first isolator 202, the third isolator 302, and the first transducer 106, the second magnet 126, A second magnetic body 124, a fourth magnetic body 125, a second isolator 203, a fourth isolator 303, and a second transducer 127 are provided. Since the second magnet 126 is shared by the second magnetic body 124 and the fourth magnetic body 125, the number of magnets can be reduced by one. In addition, by combining the second isolator 203 on the electronic circuit unit 100 side and the fourth isolator 303 on the duplexer 120 side, isolation is ensured even when the two frequency bands used for transmission and reception are close to each other. it can.

  FIG. 2 shows a circuit formed on the electronic circuit unit 100 side. A printed circuit board 105 is provided in the electronic circuit unit 100, and a circuit using a strip line as a transmission path is provided. The interface 207 includes a first transducer 106 that converts an electric signal from an electromagnetic wave in the waveguide 123 of the duplexer 120 to a strip line, and receives a received signal. In FIG. 2, the interface 207 indicates a direction input from the interface 207, and the direction of the interface 207 is indicated by an arrow on the first isolator 202. The received signal is transmitted to the wireless communication circuit 209 via the first isolator 202.

  The interface 208 includes a second transducer that converts an electrical signal from the strip line to an electromagnetic wave in the waveguide 123 of the duplexer 120, from which a transmission signal is output. In FIG. 2, the direction of the second isolator 203 is indicated by an arrow to indicate the direction of output to the interface 208. The transmission signal is output from the wireless communication circuit 209 to the interface 208 via the second isolator 203.

  The interface 206 is provided for attaching an antenna beyond the electronic circuit portion. Electrically, the interfaces 207 and 208 are separated.

  FIG. 3 shows the internal structure of the duplexer. The interface 309 is for connecting to an antenna and is a waveguide opening. A transmission signal and a reception signal are transmitted to an antenna attached to the other side that penetrates the electronic circuit unit via the interface 206 of FIG.

  The received signal transmitted to the interface 309 passes through the branching unit 308, the desired wave passes through the filter unit 306, and reaches the interface 310 through the isolator unit 302. The interface 310 is a waveguide opening.

  The transmission signal input to the interface 311 passes through the isolator unit 303, the desired wave passes through the filter unit 307, and reaches the interface 309 through the branch unit 308. The interface 311 is a waveguide opening.

  The duplexer 120 is assembled so as to overlap the printed circuit board 105 on the electronic circuit unit 100 side shown in FIG. 2, and the first magnet 114 is sandwiched between the duplexer 120 and the electronic circuit unit 100 as shown in FIG. It is. The arrows of the third isolator 302 and the fourth isolator 303 indicate the direction of the isolator in that case. That is, the first isolator 202 and the third isolator 302 are the same in the counterclockwise direction shown in the figure, and the second isolator 203 and the fourth isolator 303 are the same in the clockwise direction as shown in the figure.

  In the opposite device of the wireless communication apparatus 121, the frequency allocation to the transmission band and the reception band has an inverse relationship. When assembling as an opposite machine, the duplexer 120 is rotated 180 ° and attached to the electronic circuit unit 100 side. When rotated by 180 °, the interface 310 and the third isolator 302 are used for transmission, while the interface 311 and the fourth isolator 303 are used for transmission. In this case, since the magnet is fixed to the electronic circuit unit 100 side, the direction of the isolators 302 and 303 is not opposite to the direction of the transmission / reception signal even when rotated 180 ° and attached. Switching between transmission and reception 311 is realized.

  As described above, the significance of the present invention is that a duplexer having one circulator built in is shared by the magnets used in the transmission circuit and the reception circuit on the printed circuit board 105 of the electronic circuit unit 100 with the isolators 302 and 303 of the duplexer 120. Cost reduction can be expected. This is because the unit price of the magnet is large in the wireless communication device. Further, by combining the isolators 202 and 203 on the electronic circuit unit 100 side and the isolators 302 and 303 on the duplexer 120 side, isolation can be ensured even when two frequency bands used for transmission and reception are close to each other.

  In addition, two types of opposing electronic circuit units can be handled with one type of duplexer, which is useful for cost reduction in terms of manufacturing management.

  In addition, when two filters are used, two different types of filters are attached, whereas the duplexer is one attachment, so that the assembly cost can be reduced.

(Other examples)
In FIG. 1 and FIG. 2, the transducer for converting an electric signal between the strip line as a transmission path on the printed circuit board and the waveguide of the duplexer is formed by a pattern on the printed circuit board. However, the present invention can be implemented even if a pin-shaped microwave signal terminal is used for this transducer.

  While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-127458 for which it applied on June 18, 2013, and takes in those the indications of all here.

100 Electronic circuit portion 101, 102a, 102b, 103a, 103b, 104 Conductor 105 Printed circuit board 106 First transducer 107 Third magnetic body 108 First magnetic body 109, 110, 111, 112, 113 Spacer 114 First Magnet 115 Adhesive 116, 117, 118 Screw 119 Protrusion 120 Duplexer 121 Wireless communication device 122 Waveguide 123 of electronic circuit section Waveguide 124 of duplexer 124 Second magnetic body 125 Fourth magnetic body 126 Second magnet 127 Second magnet 127 2 transducer 202 first isolator 203 second isolator 204, 205, 304, 305 terminator 206, 207, 208, 309, 310, 311 interface 209 wireless communication circuit 210 input circuit side 211 output circuit side 212 Trip line 302 third isolator 303 fourth isolator 306, 307 filter 308 bifurcation

Claims (6)

An electronic circuit section;
Duplexer,
An antenna,
A wireless communication device comprising:
The electronic circuit unit is
A wireless communication circuit;
A first magnetic body provided on the input circuit side of the wireless communication circuit;
A second magnetic body provided on the output circuit side of the wireless communication circuit;
A first magnet forming a first isolator together with the first magnetic body;
A second magnet that forms a second isolator with the second magnetic body;
With
The duplexer is
An antenna terminal;
A transmitter terminal,
A receiving terminal,
A third magnetic body provided between the antenna terminal and the receiving terminal;
A fourth magnetic body provided between the transmitting terminal and the antenna terminal;
With
The antenna is connected to the antenna terminal;
The duplexer is disposed on the electronic circuit unit,
The first magnet and the second magnet are respectively between the first magnetic body and the third magnetic body and between the second magnetic body and the fourth magnetic body. Located between,
The third magnetic body forms a third isolator together with the first magnet,
The wireless communication apparatus, wherein the fourth magnetic body forms a fourth isolator together with the second magnet.   The wireless communication device according to claim 1, wherein the first magnetic body, the second magnetic body, the third magnetic body, and the fourth magnetic body are formed of ferrite.   The wireless communication device according to claim 1, wherein the electronic circuit unit includes a printed circuit board, and the wireless communication circuit is formed on the printed circuit board.   The wireless communication apparatus according to claim 3, wherein the wireless communication circuit on the printed circuit board uses a strip line as a transmission path.   The wireless communication device according to claim 4, wherein a transducer that converts an electric signal between the strip line and the waveguide of the duplexer is formed of a copper foil pattern on the printed board.   The wireless communication apparatus according to claim 4, wherein the transducer that converts an electric signal between the stripline and the waveguide of the duplexer is a pin-shaped microwave signal terminal.

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