JP4379220B2 - Distributor and communication method - Google Patents

Description

The present invention relates to a distributor and a communication method having three or more ports for transmitting and receiving signals of a radio transceiver module by wire. Specifically, when transmitting the output signal of the radio transceiver module to other radio transceiver modules by wire, one end of the distributor transmits and receives high frequency signals output from the radio transceiver module. Three or more signal transmission lines that have ports connected to the module by wire and are arranged symmetrically on the wiring board, a series resistor whose one end is connected to the other end of each signal transmission line, and one end Is connected to the other end of the series resistor, the other end is connected to the ground, and a parallel resistor disposed between three or more signal transmission lines, and each DC resistor and a constant of the parallel resistor are appropriately selected. By adopting a configuration, impedance matching is achieved at all ports, and the insertion loss between each port is constant, so that each radio can communicate in the same state and miniaturization is achieved. DOO in which is according to the way the distributor or the like can be.

  When evaluating or developing a radio or software for a radio, connect the radios with a cable such as a coaxial cable to create a state where they can communicate stably without being affected by external noise or reflected waves. There are things to do.

  Conventionally, a distributor that divides one signal into two is widely known. (For example, refer to Patent Document 1).

  In this case, the power divider is an input terminal, two distribution terminals, 1/4 of the set wavelength connecting between the input terminal and the distribution terminal, or an integral multiple of 1/4 of the set wavelength and half wavelength. It is provided with two branch lines having a line length and an isolation resistor connected between the distribution terminals.

  Further, a distributor that distributes a signal input from one input port to a plurality of output ports has been proposed (see, for example, Patent Document 2).

In this case, the high frequency power distribution synthesizer is a power distribution synthesizer that distributes or synthesizes high frequency power into a plurality of components, and is formed by a dielectric multilayer thin film and a metal thin film stacked on a dielectric substrate. Slot circuit, parallel plate-like balanced line, coplanar line, microstrip line and stripline, etc.
A series formed by connecting a first line composed of a slot line having a characteristic impedance Z or a parallel plate-like line to a second line and a third line comprising a slot line having a characteristic impedance Z / 2 or a parallel plate-like balanced line. A second distribution circuit, a fourth line made of a coplanar line, a microstrip line or a strip line with characteristic impedance Z ′, a fifth line made of a coplanar line, a microstrip line or a strip line with characteristic impedance 2Z ′, and a sixth line A parallel two distribution circuit configured by connecting the two lines, and a line conversion unit for connecting the second and third lines and the fourth line connected between the series two distribution circuit and the parallel distribution circuit. Equipped with two parallel distribution circuits connected to one series distribution circuit and the impedance of the first line When the o, in which the characteristic impedance in each of the fifth and sixth lines are configured to be equal to Zo.

  A microwave power distributor has been proposed (see, for example, Patent Document 3). In this case, since the part that performs power distribution has a waveguide structure, transmission loss can be reduced.

JP 2000-307313 A (pages 2, 3 and 1) Japanese Patent Laid-Open No. 9-246817 (pages 3, 4 and 1) JP-A-8-293707 (pages 3 and 4)

  When evaluating and developing a radio or software for a radio, in order to create a state in which communication can be performed stably without being affected by external noise and reflected waves, avoid external noise and each radio It is necessary to be able to receive only the radio waves that oscillate. In order to avoid the influence of interference between the direct wave and the reflected wave, it is desirable to connect the wireless terminals by wire.

  However, the conventional high-frequency signal distributor Wilkinson coupler, hybrid coupler, or a combination thereof cannot be used to build an evaluation / development system that makes the insertion loss between the ports constant. Combining conventional distributors and attenuators is not an ideal state, but even if an evaluation / development system that can be used is assembled, it becomes a large-scale configuration.

  For example, in the case of Patent Document 1 described above, it is impossible to build a radio evaluation system that distributes signals equally among all ports. Further, in order to set the signal strength to a desired value, it is necessary to use a combination of a distributor and an attenuator, and there is a drawback that it is necessary to construct a complicated and large-scale network.

  In the case of Patent Document 2 described above, the input port and the output port are specified, and the insertion loss is not constant among all the ports, so that it cannot be used for the evaluation of three or more radio devices.

  In addition, when the low-loss distributor described in Patent Document 3 described above is used to evaluate a radio device, there is a problem that the signal is distorted on the receiving side because the signal strength is too strong. Therefore, in order to perform stable wireless communication, it is necessary to send a signal attenuated to some extent to the receiving side.

  Therefore, according to the present invention, impedance matching is achieved at all ports, insertion loss is constant between the ports, each radio can communicate in the same state, and it can be inexpensive and downsized. An object of the present invention is to provide a distributor and a communication method.

Distributor according to the invention has a port to which one end of Ru is connected by wire to the wireless transceiver module, and three or more signal transmission lines are disposed in symmetrical positions on the wiring board, one end each of the signal transmission line a series resistor connected to the other end of the one end connected to the other end of the series resistor, the other end is connected to ground, and a parallel resistor disposed between the three or more signal transmission lines, The number of ports is n (number), the attenuation between each port is A (dB), the characteristic impedance of the signal transmission line is 50 (Ω), the resistance value of the series resistance is r (Ω), and the parallel resistance When the resistance value of s is s (Ω), the series resistance has a resistance value set by r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} ), and the parallel resistance is s ^{= 100 × 10 A / 20 /} {(1 + 10 A / 20) × (1- (n-1) × 10 A / 20)} is set by the resistor A shall which have a.

The communication method according to the invention has a port to which one end of Ru is connected by wire to the wireless transceiver module, and three or more signal transmission lines are disposed in symmetrical positions on the wiring board, one end each of the signal a series resistor connected to the other end of the transmission line, one end connected to the other end of the series resistor, the other end is connected to ground, and a parallel resistor disposed between the three or more signal transmission lines Provided , the number of ports is n (pieces), the attenuation between each port is A (dB), the characteristic impedance of the signal transmission line is 50 (Ω), the resistance value of the series resistance is r (Ω), When the resistance value of the parallel resistance is s (Ω), the series resistance has a resistance value set by r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} ), and the parallel resistance is ^{, s = 100 × 10 A /} 20 / {(1 + 10 A / 20) × (1- (n-1) × 10 A / 20)} set of at That connected to radios to the distributor that having a resistance value, and the step of connecting the input or output terminals of the plurality of radios transceiver module to a port of the signal transmission line cable, among the plurality of radios transceiving module The communication signal has a step of transmitting a communication signal from one, and the communication signal has a step of equally distributing the attenuated signal via the branch point and receiving other wireless transceiver modules connected in the same state It is.

In the present invention, one end of the series resistor is connected to the other end of the three or more signal transmission lines. For example, series resistors connected to a plurality of signal transmission lines each have the same resistance value. Further, the parallel resistor has one end connected to the other end of the series resistor, the other end connected to ground. Further, for example, the parallel resistance is disposed between the three or more signal transmission lines. The signal transmission line is configured by a coplanar line, a strip line, or a microstrip line, and has a ground plane between the signal transmission lines.

Moreover, further comprising the distributor, the signal transmission line, the enclose shield case a series resistor and a parallel resistor.

  With these structures, and by selecting the constants of series resistance and parallel resistance appropriately, it has both distribution and attenuation functions, eliminates the distinction between input port and output port, and impedance matching at all ports In addition, since the insertion loss is constant between the ports, each wireless device can perform communication in the same state and can be downsized.

  Therefore, there is no need to complexly combine high-frequency components such as distributors, attenuators, and terminators as in the past, and an evaluation / development system for multi-terminal wireless communication can be constructed simply by connecting the wireless device to be evaluated to the distributor. Therefore, evaluation and development can be performed intuitively and easily.

According to the present invention, has a port to which one end of Ru is connected by wire to the wireless transceiver module, and three or more signal transmission lines are disposed in symmetrical positions on the wiring board, one end each of the other signal transmission lines a series resistor connected to the end, one end connected to the other end of the series resistor, the other end is connected to ground, and a parallel resistor disposed between the three or more signal transmission lines, ports The number is n (pieces), the attenuation between each port is A (dB), the characteristic impedance of the signal transmission line is 50 (Ω), the resistance value of the series resistance is r (Ω), and the resistance of the parallel resistance When the value is s (Ω), the series resistance has a resistance value set by r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} ), and the parallel resistance is s = 100 ^{× 10 a / 20 / {(} 1 + 10 a / 20) × (1- (n-1) × 10 a / 20)} have a resistance value that is set by A shall, 0.00 impedance matching at all ports, for the insertion loss between the ports is constant, it is possible to each radio is communicating in the same state, it can be miniaturized.

Hereinafter, a distributor and a communication method according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a state of wireless communication among multiple terminals. As shown in FIG. 1, the transmission loss between the wireless devices is determined by the distance between the wireless devices, the gain of the antenna, and the like, but here it is -50 dB as an example.

  In order to create a stable multi-terminal wireless communication state for evaluation and development of wireless devices or software for wireless devices, it is necessary to avoid external noise and be able to receive only the radio waves oscillated by each wireless device. There is. In order to avoid the influence of interference between the direct wave and the reflected wave, it is desirable to connect the wireless terminals by wire. That is, in order to realize a communication environment similar to that shown in FIG. 1 by connecting wireless terminals by wire, a distributor is required in which impedance matching is achieved at all ports and insertion loss is constant between the ports.

  FIG. 2 is a diagram illustrating a configuration of the distributor 100 according to the first embodiment of the present invention. As shown in FIG. 2, the distributor 100 includes ports 1 to 6, a wiring board 11, a signal transmission line 12, a branch point 13, a series resistor 14, a parallel resistor 15, and a shield case 16. .

  Ports 1 to 6 are terminals for connecting to a radio device using a coaxial cable. It is possible to connect to six radio devices using these six ports 1 to 6. A transmission line 12 is connected to each port 1-6.

  The signal transmission line 12 is a 50Ω transmission line connected to each of the ports 1 to 6. The branch point 13 is a connection point for connecting the six signal transmission lines 12. Communication signals are distributed from this branch point 13.

  The series resistor 14 is connected to the signal transmission line 12 in series. Here, one end of each series resistor 14 is connected to the branch point 13. Further, the resistance value of each series resistor 14 is set to an equal value.

  The parallel resistor 15 is connected to the branch point 13 and arranged in parallel with each signal transmission line 12. With the resistance values of the series resistor 14 and the parallel resistor 15, the attenuation between the ports can be adjusted to a desired value. In this example, one parallel resistor 15 is provided. Note that the parallel resistor 15 may be formed of a copper foil.

  The shield case 16 is for reducing the influence of external noise. The shield case 15 covers the entire distributor circuit including the wiring board 11.

The resistance value r (Ω) of the series resistor 14 connected to each signal transmission line 12 is calculated by the following equation. In this case, assuming that the number of ports is n, the attenuation between each port is A (dB), and the characteristic impedance of the signal transmission line 12 is 50Ω, r (Ω) is
r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} )
Further, the resistance value s (Ω) of the parallel resistor 15 is calculated by the following equation.
s = 100 × 10 ^{A / 20} / {(1 + 10 ^{A / 20} ) × (1- (n−1) × 10 ^{A / 20} )}

  Here, when the resistance value r (Ω) of the series resistor 14 and the resistance value s (Ω) of the parallel resistor 15 are set so that the attenuation amount between the ports becomes −50 dB by the above equation, FIG. As described above, when a wireless device is connected to the distributor 100, the same communication environment as that of FIG. 1 described above can be realized by wire.

FIG. 3 is a diagram illustrating a configuration example of a wiring board. As shown in FIG. 3, the signal transmission line 12 is configured by a coplanar line, and has a ground plane 17 between the signal transmission lines 12. Thereby, influences, such as signal interference between each signal transmission line 12, can be reduced. Further, as will be described later , the parallel resistors 15 are disposed between the signal transmission lines 12 at a plurality of positions symmetrical with respect to the transmission lines. In the case of the distributor 100, one parallel resistor 15 is arranged.

  FIG. 4 is a diagram showing an evaluation / development system for multi-terminal wireless communication using the distributor 100. As shown in FIG. 4, in a distributor 100 having six ports, four radios 1 to 4 are connected. Connection with the radios 1 to 4 is made such that the input or output terminal of the radio transceiver module is connected to the ports 1, 2, 4 and 6 of the distributor 100 with a coaxial cable. By connecting a measuring instrument such as a spectrum analyzer to the port, signals transmitted and received by each radio can be observed. Since the characteristics of the six ports of the attenuation distributor are all common, the wireless devices 1 to 4 and the measuring device may be connected to any port of the distributor 100 without being limited to the connection method shown in FIG. Thereby, the multi-terminal wireless communication state shown in FIG. 1 described above can be realized.

  In FIG. 4, a port to which no radio is connected, for example, port 5 is preferably terminated with a 50Ω terminator. However, when the attenuation between the ports is large, for example, when the attenuation is −50 dB, port 1 The signal that goes from port 1 through port 5 to port 4 is 50 dB smaller than the signal that goes directly from port 1 to port 4, and can be ignored, so a system sufficient for evaluation and development can be built without connecting a terminator can do.

  When performing communication using the distributor 100, as shown in FIG. 4, the RF terminals of the plurality of wireless devices 1 to 4 are connected to the ports, respectively, and one of the plurality of wireless devices 1 to 4 (for example, wireless The communication signal is transmitted from the machine 1), and the communication signal is equally attenuated and distributed to other ports via the branch points 13 connecting the signal transmission lines 12. As a result, the wireless devices 2 to 4 perform communication in the same state. The same applies when another wireless device transmits a communication signal. The same can be done when transmitting communication signals simultaneously from a plurality of wireless devices.

  Thus, in the present embodiment, the ports 1 to 6 are provided, the six signal transmission lines 12 are wired to the wiring board 11, and one end of each signal transmission line 12 is connected to the branch point 13. Each signal transmission line 12 is provided with a series resistor 14. The wiring board 11 is surrounded by a shield case 16. The series resistance 14 arranged in each signal transmission line 12 has the same resistance value. The parallel resistor 15 is connected between the branch point 13 and the ground plane 17. The signal transmission line 12 is configured by a coplanar line, and has a ground plane 17 between the signal transmission lines 12.

  As a result, it has both distribution and attenuation functions, eliminates the distinction between input ports and output ports, matches impedance at all ports, and makes the insertion loss constant between ports, so each radio is in the same state. Thus, communication can be performed and downsizing can be achieved.

  As a result, there is no need to complexly combine high-frequency components such as distributors, attenuators, and terminators as in the past, and an evaluation / development system for multi-terminal wireless communication can be constructed simply by connecting the wireless device to be evaluated to the distributor. Therefore, it is possible to evaluate and develop intuitively and easily.

FIG. 5 is a diagram illustrating a configuration of a distributor 200 according to the second embodiment of the present invention. 5, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 5, the distributor 200 includes ports 1 to 4, a wiring board 11, a signal transmission line 12, a branch point 13, a series resistor 14, a parallel resistor 15, and a shield case 16. .

  The distributor 200 includes four signal transmission lines 12 and four ports 1 to 4. Four parallel resistors 15 are alternately arranged with the signal transmission line 12, and one end of each parallel resistor 15 is connected to the branch point 13. As described above, since the parallel resistors 15 are arranged between the signal transmission lines 12 at a plurality of positions symmetrical with respect to each transmission line, the isolation between the signal transmission lines is increased and the insertion loss between the ports is made uniform. can do.

  In this case, the resistance values r (Ω) and s (Ω) of the series resistor 14 and the parallel resistor 15 are obtained using the above-described calculation formula. However, the resistance value s (Ω) is a value obtained by synthesizing all the parallel resistors connected to the branch point 13.

  When the attenuation amount is large, the parallel resistance s (Ω) becomes a small value according to the above-described calculation formula. When the resistance value s (Ω) is sufficiently small, the parallel resistor 15 may connect the branch point 13 directly to the ground with a copper foil or the like without using a chip resistor or the like.

  Thus, in this embodiment, distributor 200 has ports 1 to 4, four signal transmission lines 12 are wired to wiring board 11, and one end of each signal transmission line 12 is at branch point 13. Connected. Each signal transmission line 12 is provided with a series resistor 14. The wiring board 11 is surrounded by a shield case 16. Moreover, the series resistance 14 arrange | positioned at each signal transmission line 12 has the same resistance value. The parallel resistor 15 is connected between the branch point 13 and the ground plane 17. The signal transmission line 12 is configured by a coplanar line, and has a ground plane between the signal transmission lines 12.

  As a result, it has both distribution and attenuation functions, eliminates the distinction between input ports and output ports, matches impedance at all ports, and makes the insertion loss constant between ports, so each radio is in the same state. Thus, communication can be performed and downsizing can be achieved.

  As a result, there is no need to complexly combine high-frequency components such as distributors, attenuators, and terminators as in the past, and an evaluation / development system for multi-terminal wireless communication can be constructed simply by connecting the wireless device to be evaluated to the distributor. Therefore, it is possible to evaluate and develop intuitively and easily.

FIG. 6 is a diagram showing a configuration of a distributor 300 as the third embodiment of the present invention. 6, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 6, the distributor 300 includes ports 1 to 6, a wiring board 11, a signal transmission line 12, a branch point 13, a series resistor 14, and a shield case 16. This distributor 300 has six ports 1 to 6, in which the parallel resistor 15 of the distributor 100 described above is omitted, that is, the value of the parallel resistance s (Ω) becomes infinite. The resistance value r (Ω) of the series resistor 14 is obtained using the above-described calculation formula.

  Thus, in the present embodiment, distributor 300 has ports 1 to 6, and six signal transmission lines 12 are wired to wiring board 11, and one end of each signal transmission line 12 is connected to branch point 13. Connected. Each signal transmission line 12 is provided with a series resistor 14. The wiring board 11 is surrounded by a shield case 16. Moreover, the series resistance 14 arrange | positioned at each signal transmission line 12 has the same resistance value.

  As a result, it has both distribution and attenuation functions, eliminates the distinction between input ports and output ports, matches impedance at all ports, and makes the insertion loss constant between ports, so each radio is in the same state. Thus, communication can be performed and downsizing can be achieved.

  As a result, there is no need to complexly combine high-frequency components such as distributors, attenuators, and terminators as in the past, and an evaluation / development system for multi-terminal wireless communication can be constructed simply by connecting the wireless device to be evaluated to the distributor. Therefore, it is possible to evaluate and develop intuitively and easily.

FIG. 7 is a diagram showing a configuration of a distributor 400 as the fourth embodiment of the present invention. 7, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 7, the distributor 400 includes ports 1 to 6, a wiring board 11, a signal transmission line 12, a branch point 13, a series resistor 14, a parallel resistor 15, and a shield case 16. .

  A distributor 400 shown in FIG. 7 has six ports. The parallel resistor 15 is connected to a position other than the branch point 13, that is, the signal transmission line 12.

  Thus, in the present embodiment, distributor 400 has ports 1 to 6, and six signal transmission lines 12 are wired to wiring board 11, and one end of each signal transmission line 12 is connected to branch point 13. Connected. Each signal transmission line 12 is provided with a series resistor 14. The wiring board 11 is surrounded by a shield case 16. Moreover, the series resistance 14 arrange | positioned at each signal transmission line 12 has the same resistance value. The parallel resistor 15 is connected to a position other than the branch point 13. The signal transmission line 12 is configured by a coplanar line, and has a ground plane between the signal transmission lines 12.

  With these structures, and by selecting the constants of series resistance and parallel resistance appropriately, it has both distribution and attenuation functions, eliminates the distinction between input port and output port, and impedance matching at all ports In addition, since the insertion loss is constant between the ports, each wireless device can communicate in the same state and can be downsized.

  As a result, there is no need to complexly combine high-frequency components such as distributors, attenuators, and terminators as in the past, and an evaluation / development system for multi-terminal wireless communication can be constructed simply by connecting the wireless device to be evaluated to the distributor. Therefore, it is possible to evaluate and develop intuitively and easily.

  In the above-described embodiment, the description has been given of the case having four and six ports. However, the present invention is not limited to this. The number of ports can be set to an arbitrary number of 3 or more.

  In the above-described embodiment, the example in which the attenuation amount between the ports is set to −50 dB has been described. However, the present invention is not limited to this.

  In the above-described embodiment, the series resistance 14 of each signal transmission line 12 has the same resistance value, but the present invention is not limited to this. Different resistance values may be used as necessary.

  As described above, the distributor and the communication method according to the present invention transmit and receive a signal of a wireless device in a wired manner when evaluating / developing a wireless device or evaluating / developing a software for a wireless device, so that an ideal wireless It can be used when a communication environment similar to the communication state is formed.

It is a figure which shows the example of the radio | wireless communication state of many terminals. It is a figure which shows the structural example of the divider | distributor 100 as 1st Embodiment. It is a figure which shows the structural example of a wiring board. 1 is a diagram showing an evaluation / development system for multi-terminal wireless communication using a distributor 100. FIG. It is a figure which shows the structural example of the divider | distributor 200 as 2nd Embodiment. It is a figure which shows the structural example of the divider | distributor 300 as 3rd Embodiment. It is a figure which shows the structural example of the divider | distributor 400 as 4th Embodiment.

Explanation of symbols

1, 2, 3, 4, 5, 6 ... port, 11 ... wiring board, 12 ... signal transmission line, 13 ... branch point, 14 ... series resistance, 15 ... parallel Resistance, 16 ... Shield case, 17 ... Ground plane, 100, 200, 300, 400 ... Distributor

Claims (6)

One end has a port that will be connected by wire to the wireless transceiver module, and three or more signal transmission lines are disposed in symmetrical positions on the wiring board,
A series resistor of which one end is connected to the other end of the signal transmission line,
One end connected to the other end of the series resistor, the other end is connected to ground, and a parallel resistor disposed between the three or more signal transmission lines,
The number of the above ports is n (pieces)
The attenuation between the above ports is A (dB),
The characteristic impedance of the signal transmission line is 50 (Ω),
The resistance value of the series resistor is r (Ω),
When the resistance value of the parallel resistor is s (Ω),
The series resistance is
r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} )
Has a resistance value set in
The parallel resistance is
s = 100 × 10 ^{A / 20} / {(1 + 10 ^{A / 20} ) × (1- (n−1) × 10 ^{A / 20} )}
In distributor that having a resistance value set.   The distributor according to claim 1, wherein each of the series resistors has the same resistance value.   The distributor according to claim 1, wherein the parallel resistor is formed of a copper foil.   The distributor according to claim 1, wherein the signal transmission line is configured by a coplanar line, a strip line, or a microstrip line, and has a ground plane between the signal transmission lines.   The distributor according to claim 1, further comprising a shield case surrounding the signal transmission line, the series resistor, and the parallel resistor. One end has a port that will be connected by wire to the wireless transceiver module, and three or more signal transmission lines are disposed in symmetrical positions on the wiring board, the series of which one end is connected to the other end of the signal transmission line a resistor, one end connected to the other end of the series resistor, the other end is connected to ground, and a parallel resistor disposed between the three or more signal transmission lines, the number of the port n (A), the attenuation between the ports is A (dB), the characteristic impedance of the signal transmission line is 50 (Ω), the resistance value of the series resistance is r (Ω), and the parallel resistance When the resistance value is s (Ω),
The series resistance is
r = 50 × (1-10 ^{A / 20} ) / (1 + 10 ^{A / 20} )
Has a resistance value set in
The parallel resistance is
s = 100 × 10 ^{A / 20} / {(1 + 10 ^{A / 20} ) × (1- (n−1) × 10 ^{A / 20} )}
Radio is that in connected to the distributor that having a resistance value that is set,
Connecting the input or output terminals of the plurality of radio transceiver modules to the port of the signal transmission line with a cable;
Transmitting a communication signal from one of the plurality of radio transceiver modules;
The communication method includes a step of equally distributing the attenuated signal via the branch point and receiving other radio transceiver modules connected in the same state.

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