A signal output device and a signal output method

Abstract

The application relates to a signal output device and a signal output method, the device comprising a first unit, a coupling unit and a second unit, the first unit output port one being connected with the second unit input port one, the first unit output port two being connected with the input port of the coupling unit, the output port of the coupling unit being connected with the second unit input port two, the coupling unit further having a coupling output port, the second unit output port one, the second unit output port two and the coupling output port being the output ports of the device, the signals output between any two of the output ports being orthogonal, and the two signals output by each output port being level balanced. In the second unit output port one and the second unit output port two, the signal level strengths of the two signals of each output port are closer, and when the signals of a certain output port of the two output ports are used to do room division coverage, the room division coverage can be more balanced.

Description

Technical Field

[0001] This invention belongs to the field of wireless communication technology, and specifically relates to a signal output device and a signal output method. Background Technology

[0002] In the future, over 80% of data services will occur indoors, making indoor mobile networks crucial. Ensuring optimal user experience, efficient operation and maintenance, and intelligent management are core competitive advantages for operators. To improve indoor coverage and accelerate the introduction of 5G mobile networks into indoor distribution systems, operators are vigorously organizing indoor distribution system upgrades and construction, making the competition in the indoor distribution market a focal point of rivalry among major operators.

[0003] Compared to other mobile communication systems, the hallmark improvement of 5G in wireless technology is Multiple-Input Multiple-Output (MIMO). However, for indoor distribution systems, traditional passive indoor distribution systems are single-path systems and cannot achieve 5G MIMO. Currently, there is a new low-cost upgrade method for 5G indoor distribution dual-stream upgrades—dual-path coupling upgrade. The dual-path coupling upgrade uses a two-path backbone approach. On the backbone, dual-stream and multiple-stream signals need to be combined to the floor level. Existing devices have the problem of poor dual-stream output balance at the output ports, and the two signals (the two signals corresponding to the two input ports) in each output port have a large difference in level, that is, the balance of the two signals in each output port is poor. When each output port is used as the signal source for the floor level coverage of the indoor distribution system, the poor balance of the two signals will affect the MIMO effect. Summary of the Invention

[0004] In order to solve all or part of the above problems, the present invention aims to provide a signal output device and a signal output method, through which the two signals of each output port of the second unit of the device are closer together. When each output port of the present invention is used as an indoor coverage signal source, the indoor coverage can be more balanced.

[0005] According to a first aspect of the present invention, a signal output device is provided, comprising a first unit, a coupling unit, and a second unit;

[0006] The first unit has a first unit input port one, a first unit input port two, a first unit output port one, and a first unit output port two. The first unit input port one and the first unit input port two are used to input one signal, respectively. The second unit has a second unit input port one, a second unit input port two, a second unit output port one, and a second unit output port two.

[0007] The first unit output port one is connected to the second unit input port one, the first unit output port two is connected to the input port of the coupling unit, and the output port of the coupling unit is connected to the second unit input port two;

[0008] The coupling unit also has a coupling output port. The second unit output port one, the second unit output port two and the coupling output port are the output ports of the device. The signals output between any two output ports are orthogonal, and the two signals output by each output port are level balanced.

[0009] Furthermore, the first unit is a first-stage bridge.

[0010] Furthermore, the first-stage bridge is an equally divided bridge.

[0011] Furthermore, the second unit is a second-stage bridge.

[0012] Furthermore, the second-stage bridge is a non-equal-division bridge.

[0013] Furthermore, the coupling unit is a coupler.

[0014] According to a second aspect of the present invention, a signal output method is provided, the method employing any of the signal output devices described above, the method comprising the following steps:

[0015] The first signal S1 is input to the first unit through the first unit input port one, and the second signal S2 is input to the first unit through the first unit input port two;

[0016] The first signal S1 and the second signal S2 are output from the output port of the device, and each output port of the device outputs two balanced signals.

[0017] Furthermore, the specific steps for outputting the first signal S1 and the second signal S2 from the output port of the device, and for each output port of the device to output two level-balanced signals, are as follows:

[0018] The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively.

[0019] The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the two signal levels output from the coupling output port are balanced. The other path is output from the output port of the coupling unit.

[0020] The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 1 are balanced. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 2 are also balanced.

[0021] According to a third aspect of the present invention, a signal output method is provided, the method employing any of the signal output devices described above, the method comprising the following steps:

[0022] The first signal S1 is input to the first unit through the first unit input port one, and the second signal S2 is input to the first unit through the first unit input port two;

[0023] The first signal S1 and the second signal S2 are output from the output port of the device, and the signals output from any two output ports are orthogonal to each other.

[0024] Furthermore, the first signal S1 and the second signal S2 are output from the output port of the device, and the signals output from any two output ports are orthogonal to each other. The specific steps are as follows:

[0025] The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively.

[0026] The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the other path is output from the output port of the coupling unit.

[0027] The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. Finally, the two total signals output from the second unit output port 1 and the second unit output port 2 are combined.

[0028] Among them, any two of the three signals—the signal output from the coupling output port of the coupling unit, the total signal output from the first output port of the second unit, and the total signal output from the second output port of the second unit—are orthogonal.

[0029] As can be seen from the above technical solution, the signal output device provided by the present invention has the following beneficial effects:

[0030] The present invention enables each of the three output ports to output two balanced signals, and the signals of any two of the three output ports are orthogonal.

[0031] In the second unit output port one and the second unit output port two of this invention, the two signal level intensities of each output port are similar. When the signal of one of the two output ports is used as the indoor coverage signal source, the indoor coverage can be more balanced. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a signal output device according to an embodiment of the present invention;

[0033] The attached figures are labeled as follows: Unit 1, Unit 1 Input Port 11, Unit 1 Input Port 2 12, Unit 1 Output Port 13, Unit 1 Output Port 2 14, Coupled Unit 2, Coupled Output Port 21, Unit 3, Unit 2 Input Port 1 31, Unit 2 Input Port 2 32, Unit 2 Output Port 1 33, Unit 2 Output Port 2 34. Detailed Implementation

[0034] To better understand the purpose, structure, and function of the present invention, a signal output device and signal output method of the present invention will be described in further detail below with reference to the accompanying drawings.

[0035] like Figure 1The diagram illustrates a signal output device according to an embodiment of the present invention, comprising a first unit 1, a coupling unit 2, and a second unit 3. The first unit 1 has a first unit input port 11, a first unit input port 12, a first unit output port 13, and a first unit output port 14. The first unit input port 11 and the first unit input port 12 are respectively used to input one signal, and the first unit output port 13 and the first unit output port 14 are respectively used to output two level-balanced signals. The second unit 3 has a second unit input port 31, a second unit input port 32, a second unit output port 33, and a second unit output port 34. The coupling unit 2 has an input port, an output port, and a coupling output port 21. The specific connection relationship between the first unit 1, the coupling unit 2, and the second unit 3 is as follows: the first unit output port 13 is connected to the second unit input port 31, the first unit output port 14 is connected to the input port of the coupling unit, the output port of the coupling unit is connected to the second unit input port 32, and the second unit output port 33, the second unit output port 34, and the coupling output port 21 are the output ports of the device described in this embodiment. The signals output between any two of the three output ports are orthogonal, and the two signals output by each output port are level balanced.

[0036] In the previous embodiment, after signal a is input through the first unit input port 11 of the first unit 1, the signal output by the first unit 1 has two paths. One path goes directly through the second unit input port 31 of the second unit 3 to the second unit 3, and is output from the second unit output port 33 and the second unit output port 34 of the second unit 3. The other path goes to the coupling unit 2. The output signal after reaching the coupling unit 2 is also divided into two paths. One path goes directly from the coupling output port 21 of the coupling unit 2, and the other path goes through the coupling unit 2 to the second unit 3, and is also output from the second unit output port 33 and the second unit output port 34 of the second unit 3. After signal b is input through the first unit input port 12 of the first unit 1, the movement path of signal b is the same as that of signal a. Finally, it is output through the coupling output port of the coupling unit 2 and the second unit output port 33 and the second unit output port 34 of the second unit 3.

[0037] Based on the previous embodiment, in this embodiment, the first unit 1 is a first-stage bridge.

[0038] Based on the previous embodiment, in this embodiment the first-stage bridge is an equally divided bridge. The equally divided bridge enables each of the first-stage bridge output ports 13 and 14 to output two signals with balanced levels.

[0039] Based on the previous embodiment, in this embodiment, the second unit 3 is a second-stage bridge.

[0040] Based on the previous embodiment, the second-stage bridge in this embodiment is a non-equal-division bridge.

[0041] Furthermore, the coupling unit is a coupler.

[0042] The device of the above embodiments of the present invention can realize that each of the three output ports outputs two signals with balanced levels; the signals output by any two of the other three output ports are orthogonal; the device of the above embodiments of the present invention is different from the existing indoor distribution system and dual-channel coupler in terms of system structure and performance characteristics, so the solution has strong innovation.

[0043] Compared to existing technical solutions, in this solution, the signal levels of the two output ports in the second unit output port 33 and the second unit output port 34 are close. Taking the 10dB model as an example, the two signals S1 and S2 output from each port in the second unit output port 33 and the second unit output port 34 are both about 0.45 times the input level. When performing indoor coverage, the energy of the two ports is closer, which can ensure more balanced indoor coverage.

[0044] Secondly, embodiments of the present invention provide a signal output method, wherein the method employs a signal output device as described in any of the above embodiments, and the method includes the following steps:

[0045] Step 100: Input the first signal S1 into the first unit through the first unit input port one, and input the second signal S2 into the first unit through the first unit input port two;

[0046] Step 110: The first signal S1 and the second signal S2 are output from the output port of the device through the device, and each output port of the device outputs two level-balanced signals.

[0047] The specific steps for the first signal S1 and the second signal S2 to be output from the output port of the device, and for each output port of the device to output two level-balanced signals, are as follows:

[0048] The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively.

[0049] The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the two signal levels output from the coupling output port are balanced. The other path is output from the output port of the coupling unit.

[0050] The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 1 are balanced. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 2 are also balanced.

[0051] Specifically, using the device described in any of the above embodiments, if the signal input through the first unit input port 11 is S1 and the signal input through the first unit input port 12 is S2, then the signal reaching the first unit output port 14 is 0.5S1+0.5S2. If the coupling unit is set to a 10dB coupler, then the signal output from the coupling output port 21 is 0.05S1+0.05S2, that is, the level strengths of S1 and S2 at this port are equivalent, that is, the two signal levels output from this port are balanced.

[0052] Furthermore, since each of the first unit output port 13 and the first unit output port 14 outputs two balanced signals, each of the second unit output ports 33 and 34 can also output two balanced signals, as detailed below:

[0053] Taking both coupling unit 2 and the second unit 3 as 10dB as an example, the output signal of the second unit output port 33 is calculated as follows:

[0054] 0.9(0.5S1+0.5S2)+0.9(0.5S1+0.5S2)0.1

[0055] =0.99(0.5S1+0.5S2)

[0056] =0.495S1+0.495S2

[0057] That is, the output signal of the second unit output port 33 is 0.495S1+0.495S2. Therefore, it can be seen that the level amplitudes of S1 and S2 are similar, and the two signal levels are balanced.

[0058] Similarly, the two signal levels output by the second unit output port 34 can be balanced.

[0059] Therefore, it can be seen that by using any of the devices described in the above embodiments, the signal output method of this embodiment can realize that each output port of the device outputs two signals with balanced levels respectively.

[0060] Furthermore, this embodiment of the invention provides a signal output method, which employs any of the signal output devices described above, and the method includes the following steps:

[0061] Step 200: Input the first signal S1 into the first unit through the first unit input port one, and input the second signal S2 into the first unit through the first unit input port two;

[0062] Step 210: The first signal S1 and the second signal S2 are output from the output port of the device, and the signals output from any two output ports are orthogonal to each other.

[0063] The specific steps for the first signal S1 and the second signal S2 to be output from the output port of the device, and for the signals output from any two output ports to be orthogonal to each other, are as follows:

[0064] The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively.

[0065] The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the other path is output from the output port of the coupling unit.

[0066] The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. Finally, the two total signals output from the second unit output port 1 and the second unit output port 2 are combined.

[0067] Among them, any two of the three signals—the signal output from the coupling output port of the coupling unit, the total signal output from the first output port of the second unit, and the total signal output from the second output port of the second unit—are orthogonal.

[0068] Specifically, in any of the above embodiments of the device, the signal phase shift from the first unit input port 11 to the first unit output port 13 is 90°, the phase shift from the first unit input port 11 to the first unit output port 14 is 180°, the phase shift from the first unit input port 12 to the first unit output port 14 is 90°, and the phase shift from the first unit input port 12 to the first unit output port 13 is 180°; similarly, the signal phase shift from the second unit input port 31 to the second unit output port 33 is 90°, the signal phase shift from the second unit input port 31 to the second unit output port 34 is 180°, the signal phase shift from the second unit input port 32 to the second unit output port 34 is 90°, and the signal phase shift from the second unit input port 32 to the second unit output port 33 is 180°.

[0069] The signal input through the first unit input port 11 is set as S1, and the signal input through the first unit input port 12 is set as S2; the coupling unit is set as a 10dB coupler, and the phase shift from the first unit output port 14 to the coupling output port 21 is 180°.

[0070] Let A represent the signal output through coupling output port 21. Then:

[0071] A = 0.5S1e -j(ωt+π+π) *0.1+0.5S2e -j(ωt+π / 2+π) *0.1

[0072] =0.05S1 e -jωt +0.05S2 e -j(ωt+3π / 2) ;

[0073] Let B represent the signal output through the second unit output port 33. Then:

[0074] B = 0.5S1e -j(ωt+π / 2+π / 2) *0.9+0.5S1e -j(ωt+π+π / 2+π) *0.9*0.1+0.5S2e -j(ωt+π / 2+π / 2+π) *0.9*0.1+0.5S2e -j(ωt+π+π / 2) *0.9

[0075] =0.45S1e -j(ωt+π) +0.045S1e -j(ωt+π / 2) +0.045S2e -jωt +0.45S2e -j(ωt+3π / 2)

[0076] =(0.45e -j(ωt+π) +0.045e -j(ωt+π / 2) )S1+(0.045e -jωt +0.45e -j(ωt+3π / 2) S2;

[0077] The signal output through the second unit output port 34 is represented by C. Then:

[0078] C = 0.5S1e -j(ωt+π / 2+π) *0.1+0.5S1e -j(ωt+π+π / 2+π / 2) *0.9*0.9+0.5S2e -j(ωt+π / 2+π / 2+π / 2) *0.9*0.9+0.5S2e -j(ωt+π+π) *0.1

[0079] =0.05S1e -j(ωt+3π / 2) +0.405S1e -jωt +0.405S2e -j(ωt+3π / 2) +0.05S2e -jωt

[0080] =(0.05e -j(ωt+3π / 2) +0.405e -jωt )S1+(0.405e -j(ωt+3π / 2) +0.05e -jωt S2;

[0081] By comparing the coefficient matrices of signals S1 and S2 in A and B, it can be seen that the signals output from the coupled output port 21 and the second unit output port 33 are orthogonal. Similarly, by comparing the coefficient matrices of signals S1 and S2 in A and C, it can be seen that the signals output from the coupled output port 21 and the second unit output port 34 are orthogonal. By comparing the coefficient matrices of signals S1 and S2 in B and C, it can be seen that the signals output from the second unit output port 33 and the second unit output port 34 are orthogonal.

[0082] Therefore, it can be seen that by using the device described in any of the above embodiments, the signal output method of this embodiment can achieve orthogonality of the signals output between any two output ports of the device.

[0083] Finally, the signal output device of the above embodiments of the present invention can be specifically applied to different floors, namely the first floor and the second floor, both of which are equipped with the device described in any of the above embodiments.

[0084] By installing the device described in any of the above embodiments on two different floors, the signals output from the coupling output ports of the two floors can be made orthogonal. The specific principle is as follows:

[0085] The signal input through the first unit input port 11 on the first floor is S1, and the signal input through the first unit input port 12 is S2. The coupling degree of the dual-channel signal orthogonal coupling output device on the first floor is set to 10dB. Then the signal output through the coupling output port 21 on the first floor is 0.05S1+0.05S2.

[0086] The signal loss is set to h when signal S1 is transmitted from the first floor to the second floor. 11 The signal loss of signal S2 when it is transmitted from the first floor to the second floor is h. 22 The initial input signal, after being transmitted to the second floor, becomes h. 11 S1 and h 22 S2, two signals are input to the two input ports of the dual-signal orthogonal coupling output device located on the second floor. The coupling degree of the dual-signal orthogonal coupling output device on the second floor is set to 10dB. Then, the output signal through the coupling output port 21 on the second floor is 0.05h. 11 S1+0.05h 22 S2;

[0087] Therefore, by comparing the coefficients of S1 and S2 in the output signals of the two floor coupling output ports, it can be seen that the signals output from the two coupling output ports are orthogonal.

[0088] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0089] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0090] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A signal output device, characterized in that, It includes a first unit, a coupling unit, and a second unit; The first unit has a first unit input port one, a first unit input port two, a first unit output port one, and a first unit output port two. The first unit input port one and the first unit input port two are used to input one signal, respectively. The second unit has a second unit input port one, a second unit input port two, a second unit output port one, and a second unit output port two. The first unit output port one is connected to the second unit input port one, the first unit output port two is connected to the input port of the coupling unit, and the output port of the coupling unit is connected to the second unit input port two; The coupling unit also has a coupling output port. The second unit output port one, the second unit output port two and the coupling output port are the output ports of the device. The signals output between any two output ports are orthogonal and the two signals output by each output port are level balanced. The first unit is a first-stage bridge, and the second unit is a second-stage bridge.

2. The signal output device according to claim 1, characterized in that, The first-stage bridge is an equal-division bridge.

3. The signal output device according to claim 1, characterized in that, The second-stage bridge is a non-equal-division bridge.

4. The signal output device according to claim 1, characterized in that, The coupling unit is a coupler.

5. A signal output method, characterized in that, The method employs a signal output device according to any one of claims 1-4, and the method includes the following steps: The first signal S1 is input to the first unit through the first unit input port one, and the second signal S2 is input to the first unit through the first unit input port two; The first signal S1 and the second signal S2 are output from the output port of the device, and each output port of the device outputs two balanced signals.

6. A method according to claim 5, characterized in that, The specific steps for the first signal S1 and the second signal S2 to be output from the output port of the device, and for each output port of the device to output two balanced signals, are as follows: The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the two signal levels output from the coupling output port are balanced. The other path is output from the output port of the coupling unit. The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 1 are balanced. The levels of signal S1 and signal S2 in the total signal output from the second unit output port 2 are also balanced.

7. A signal output method, characterized in that, The method employs a signal output device according to any one of claims 1-4, and the method includes the following steps: The first signal S1 is input to the first unit through the first unit input port one, and the second signal S2 is input to the first unit through the first unit input port two; The first signal S1 and the second signal S2 are output from the output port of the device, and the signals output from any two output ports are orthogonal to each other.

8. A method according to claim 7, characterized in that, The specific steps for the first signal S1 and the second signal S2 to be output from the output port of the device, and for the signals output from any two output ports to be orthogonal to each other, are as follows: The first signal S1 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. Similarly, the second signal S2 is split into two after passing through the first unit, and is output from the first unit output port one and the first unit output port two respectively. The total signal output from the first unit's output port 2 is split into two paths after passing through the coupling unit. One path is output from the coupling output port of the coupling unit, and the other path is output from the output port of the coupling unit. The total signal output from the first unit output port 1 reaches the second unit through the second unit input port 1. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. The signal output from the output port of the coupling unit reaches the second unit through the second unit input port 2. After passing through the second unit, it is also divided into two paths and output from the second unit output port 1 and the second unit output port 2 respectively. Finally, the two total signals are output from the second unit output port 1 and the second unit output port 2. Among them, any two of the three signals—the signal output from the coupling output port of the coupling unit, the total signal output from the first output port of the second unit, and the total signal output from the second output port of the second unit—are orthogonal.

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