Tee-coupler circuit and tee-coupler containing same

Abstract

The application provides a tee coupler circuit and a tee coupler containing the same. The tee coupler circuit comprises: a first coupler, the first coupler being provided with a first input port; a second coupler, the second coupler being provided with a second input port; and a third coupler, the third coupler being provided with a third input port. The second coupler and the third coupler are coupled and connected, and the second coupler and the third coupler are symmetrically connected to the first coupler. The first input port, the second input port and the third input port are used to form three ports of the tee coupler, and the ports are incident ports, coupled output ports or straight-through output ports. The three ports formed by the application can simultaneously serve as input ports and output ports of high-power radio frequency signals, thereby solving the technical problem that the three ports of the coupler in the prior art cannot simultaneously serve as input ports and output ports of high-power radio frequency signals, and leading to poor use flexibility.

Description

Technical Field

[0001] This invention relates to the field of coupler technology, and more specifically to a three-way coupler circuit and a three-way coupler containing the same. Background Technology

[0002] An indoor distribution system refers to a system where base station signals are split using passive devices and distributed via feeders to low-power antennas installed in various areas of a building, thereby achieving uniform signal distribution within the building. Couplers are commonly used passive devices in communication systems. They are typically used when it is not necessary to distribute power evenly, but only to couple a portion of the energy from the main line or branch lines for power distribution.

[0003] Taking a coupler as an example, a coupler is a three-port device, such as... Figure 1 As shown, it includes an input port b1, a coupled output port a1, and a through output port c1. The coupler main line is used for signal transmission, and the coupled output port a1 couples part of the main line signal. Depending on the coupling power requirements, common power types are 6dB, 10dB, 15dB, 20dB, and 30dB.

[0004] The advantage of a coupler is that each port is matched, resulting in a better standing wave ratio. However, it cannot be used for applications with multiple input ports. For example, since the coupled output port a1 and the direct output port c1 are isolated ports, the input port b1 and the coupled output port a1 cannot have the same coupling degree, which means that the direct output port c1 cannot be used as both an output port and an input port at the same time.

[0005] The tapper coupler solves this problem, such as Figure 2 As shown, the tapepper coupler includes an input port b2, a coupled output port a2, and a through output port c2. Its input port b2 and through output port c2 can be used as input ports at the same time, but the matching of the coupled output port a2 is poor and it cannot be used as a port for inputting large power.

[0006] Therefore, the above-mentioned prior art has at least the following technical problems: the coupler in the prior art can only be used as a power divider on the main line port, and the three ports (i.e., the incident port, the coupled output port and the through output port) cannot be used as input ports and output ports for high-power radio frequency signals at the same time, resulting in poor flexibility of use. Summary of the Invention

[0007] This application provides a three-way coupler circuit and a three-way coupler containing the same, which solves the technical problem in the prior art that the three ports of the coupler cannot be used simultaneously as input and output ports for high-power radio frequency signals, resulting in poor flexibility of use.

[0008] To address the aforementioned technical problems, in a first aspect, embodiments of this application provide a three-way coupler circuit for use in a three-way coupler, the three-way coupler circuit comprising:

[0009] A first coupler, wherein the first coupler is provided with a first input port;

[0010] A second coupler, wherein the second coupler is provided with a second input port;

[0011] A third coupler, wherein the third coupler is provided with a third input port;

[0012] The second coupler and the third coupler are coupled together, and the second coupler and the third coupler are symmetrically connected to the first coupler.

[0013] The first input port, the second input port, and the third input port form the three ports of the three-way coupler, and the ports are incident ports, coupled output ports, or through output ports. Furthermore, the first coupler also includes a first coupled output port, a first transmission port, and a first isolation port.

[0014] The specific connection method of the second coupler and the third coupler being symmetrically connected to the first coupler is as follows: the first coupling output port is connected to the second coupler, and the first transmission port is connected to the third coupler;

[0015] The first isolated port is connected to the first load.

[0016] Furthermore, the second coupler also includes a second coupling output port, a second transmission port, and a second isolation port;

[0017] The third coupler also includes a third coupling output port, a third transmission port, and a third isolation port;

[0018] The specific connection method of the coupling connection between the second coupler and the third coupler is as follows: the second transmission port is connected to the third transmission port.

[0019] Furthermore, the specific connection method of the second coupler and the third coupler being symmetrically connected to the first coupler is as follows: the first coupling output port is connected to the second coupling output port, and the first transmission port is connected to the third coupling output port;

[0020] The second isolation port is connected to a second load, and the third isolation port is also connected to a third load.

[0021] Furthermore, the specific connection method of the second coupler and the third coupler symmetrically connected to the first coupler is as follows: the first coupling output port is connected to the second isolation port, and the first transmission port is connected to the third isolation port;

[0022] The second coupling output port is connected to a second load, and the third coupling output port is connected to a third load.

[0023] Furthermore, the specific connection method of the second coupler and the third coupler being symmetrically connected to the first coupler is as follows: the first coupling output port is connected to the second coupling output port, and the first transmission port is connected to the third coupling output port;

[0024] The second isolation port and the third isolation port are connected via a fourth load.

[0025] Furthermore, the first coupler is a 3dB coupler, and the second coupler and the third coupler are the same.

[0026] Furthermore, the second coupler and the third coupler are xdB couplers, and 3≤x≤30.

[0027] Furthermore, the second transmission port and the third transmission port are connected via a 50-ohm transmission line.

[0028] Secondly, embodiments of this application provide a three-way coupler, the three-way coupler including a housing and the three-way coupler circuit, the three-way coupler circuit being encapsulated within the housing, and the incident port, the coupling output port and the through output port being exposed outside the housing.

[0029] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0030] (1) The three ports (first port, second port and third port) formed in the three-way coupler circuit described in this embodiment can be used as input ports and output ports of high-power radio frequency signals at the same time. Each port is matched and the coupling of each port is different. Any one port can be used as input and the other two ports can be used as branch outputs. This realizes the true three-port signal interconnection and can be used as input ports and output ports of high-power radio frequency signals at the same time. This solves the technical problem that the three ports of the coupler in the prior art cannot be used as input ports and output ports of high-power radio frequency signals at the same time, resulting in poor flexibility of use.

[0031] (2) The three-way coupler circuit described in this embodiment can be used as a signal splitter of any frequency or as a frequency combiner. Moreover, there is no limit to the input power. The maximum power depends on the rated power of the connected load, which meets the ultra-high flexibility requirements of indoor distribution system coverage.

[0032] (3) By changing the x values ​​of the second and third couplers, three-way couplers with various power levels can be obtained, and a series of products can be made to meet personalized needs.

[0033] (4) By changing the bandwidth design of the first coupler, the second coupler and the third coupler, the broadband coverage requirements of the present invention can be met, and signal synthesis and distribution of any frequency can be realized. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a 10dB coupler in the prior art. In the diagram, IN represents the input port and OUT represents the through port.

[0036] Figure 2 This is a schematic diagram of the structure of a 6dB coupler tapeper in the prior art. In the diagram, IN represents the input port and OUT represents the through port.

[0037] Figure 3 This is a schematic diagram of a three-way coupler circuit provided in Embodiment 1 of the present invention;

[0038] Figure 4 The diagram shows the simulation results of the 10dB three-way coupler formed by the three-way coupler circuit provided in Embodiment 1 of the present invention. In the figure, 10dB Symmetric Tapper refers to 10dB three-way coupler, the horizontal axis is Frequency (GHz), and the vertical axis is coupling or loss (dB).

[0039] DB(S(2,1))symmetric tapper refers to the coupling or loss curve from the first port to the second port, DB(S(3,1))symmetric tapper refers to the coupling or loss curve from the first port to the third port, and DB(S(2,3))symmetric tapper refers to the coupling or loss curve from the third port to the second port.

[0040] Figure 5 This is a schematic diagram of the three-way coupler circuit provided in Embodiment 2 of the present invention;

[0041] Figure 6 This is a schematic diagram of the three-way coupler circuit provided in Embodiment 3 of the present invention. Detailed Implementation

[0042] This application provides a three-way coupler circuit and a three-way coupler containing the same, which solves the technical problem in the prior art that the three ports of the coupler cannot be used simultaneously as input and output ports for high-power radio frequency signals, resulting in poor flexibility of use.

[0043] One or more embodiments of this application provide a three-way coupler circuit for forming a three-way coupler, for example, when the three-way coupler circuit is packaged in a compatible housing, a three-way coupler can be formed.

[0044] The three-way coupler circuit includes a first coupler D1, a second coupler D2, and a third coupler D3. The first coupler D1 has a first input port 11, the second coupler D2 has a second input port 21, and the third coupler D3 has a third input port 31. The second coupler D2 and the third coupler D3 are coupled together, and the second coupler D2 and the third coupler D3 are symmetrically connected to the first coupler D1.

[0045] The first input port 11, the second input port 21, and the third input port 31 form the three ports of the three-way coupler, namely the first port 1, the second port 2, and the third port 3. These three ports serve as the input port, coupling output port, or direct output port of the three-way coupler. All three ports are exposed outside the housing for easy connection to external devices.

[0046] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0047] Example 1

[0048] Example 1 provides a three-way coupler circuit, such as Figure 3As shown, the three-way coupler circuit includes a first coupler D1, a second coupler D2, and a third coupler D3, wherein:

[0049] The first coupler D1 includes: a first input port 11, a first coupled output port 12, a first transmission port 13, and a first isolation port 14;

[0050] The second coupler D2 includes: a second input port 21, a second coupling output port 22, a second transmission port 23, and a second isolation port 24;

[0051] The third coupler D3 includes: a third input port 31, a third coupling output port 32, a third transmission port 33, and a third isolation port 34.

[0052] In this embodiment, the first coupler D1 is a 3dB coupler, and the second coupler D2 and the third coupler D3 are the same (i.e., they are the same type of coupler).

[0053] The specific structure of the second coupler D2 and the third coupler D3 symmetrically connected to the first coupler D1 is as follows:

[0054] The first coupling output port 12 is connected to the second coupling output port 22, the first transmission port 13 is connected to the third coupling output port 32, and the first isolation port 14 is connected to the first load E1; the second transmission port 23 is connected to the third transmission port 33, the second isolation port 24 is connected to the second load E2; and the third isolation port 34 is connected to the third load E3.

[0055] The first input port 11, the second input port 21, and the third input port 31 form the three ports of the three-way coupler, and the ports are incident ports, coupled output ports, or through output ports, specifically referring to:

[0056] When the power signal is input from the first port 1, the first port 1 formed by the first input port 11 is the input port (input port) of the three-way coupler, the second port 2 formed by the second input port 21 is the coupling output port of the three-way coupler, and the third port 3 formed by the third input port 31 is the coupling output port of the three-way coupler.

[0057] When the power signal is input from the second port 2, the first port 1 formed by the first input port 11 is the coupling output port of the three-way coupler, the second port 2 formed by the second input port 21 is the input port of the three-way coupler, and the third port 3 formed by the third input port 31 is the direct output port of the three-way coupler.

[0058] When the power signal is input from the third port 3, the first port 1 formed by the first input port 11 is the coupling output port of the three-way coupler, the second port 2 formed by the second input port 21 is the direct output port of the three-way coupler, and the third port 3 formed by the third input port 31 is the incident port of the three-way coupler.

[0059] It should be noted that the three ports used to form the three-way coupler, namely the first input port 11, the second input port 21 and the third input port 31, refer to the three ports being directly formed by the first input port 11, the second input port 21 and the third input port 31, or formed by connecting the corresponding connectors.

[0060] In this embodiment, the second transmission port 23 and the third transmission port 33 are connected by a 50-ohm transmission line.

[0061] In this embodiment, the first load E1, the second load E2, and the third load E3 can be low intermodulation loads or ordinary loads; there are no restrictions, and the appropriate load type can be selected according to the actual situation. Furthermore, the first load E1, the second load E2, and the third load E3 are loads with a matched impedance of 50 ohms, and their rated power depends on the power of the input signal.

[0062] In this embodiment, the second coupler D2 and the third coupler D3 are xdB couplers, where x is generally a positive integer and 3 ≤ x ≤ 30. An xdB coupler refers to a coupling degree of xdB between the coupler's output port and the main line. For example, the second coupler D2 and the third coupler D3 can be 3dB, 6dB, 10dB, 15dB, 20dB, or 30dB couplers, etc.

[0063] The three-way coupler circuit described in this embodiment has the following functions:

[0064] 1. The three ports formed in the three-way coupler circuit described in this embodiment can be used simultaneously as input ports and output ports for high-power radio frequency signals. Any one of the ports can be used as an input, while the other two ports can be used as branch outputs.

[0065] Taking a 3dB coupler as an example, the implementation principle of this function is analyzed:

[0066] It should be noted that dB is a relative value, used to represent the ratio of two powers, and is converted to 10^(-x / 10), for example:

[0067] If 3dB of energy is transferred / coupled from the input port to the output port (coupled output port or through output port), it can be understood that 50% of the energy can be transferred from the input port to the output port.

[0068] If 6dB of energy is transferred / coupled from the input port to the output port, it can be understood that 25% of the energy can be transferred from the input port to the output port.

[0069] If 9dB of energy is transferred / coupled from the input port to the output port, it can be understood that 12.5% ​​of the energy can be transferred from the input port to the output port.

[0070] (1.1) When the power signal is input from the first port 1 (at this time, the first port 1 is the incident port, the second port 2 is the coupled output port, and the third port 3 is the coupled output port), 50% of the energy (-3dB) is transmitted through the 3dB coupler (the first coupler) to the second coupled output port 22 of the second coupler D2 and the third coupled output port 32 of the third coupler D3 respectively;

[0071] After passing through the second coupled output port 22 and the second input port 21, the coupling attenuation of the second coupler D2 reaches the second port 2. At this time, the transmitted energy is -3dB ± xdB, where x is the coupling degree of the second coupler D2.

[0072] After passing through the third coupling output port 32 and the third input port 31, the coupling loss of the third coupler D3 reaches the third port 3. At this time, the transmitted energy is -3dB ± xdB, where x is the coupling degree of the third coupler D3.

[0073] After passing through the second coupling output port 22 and the second isolation port 24, the second coupler D2 transmits attenuation to the second load E2 connected to the second isolation port 24. At this time, the energy transmitted to each load is: 10log(1-10^(-x / 10)).

[0074] For example, x = 7dB:

[0075] The energy from port 1 to port 2 (S21) or from port 1 to port 3 (S31) is: -3dB + -7dB = -10dB;

[0076] The energy from the first port 1 to the first isolation port 14 of the first coupler D1 into the first load E1 is: -3dB;

[0077] The energy from the first port 1 to the second isolation port 24 of the second coupler D2 into the second load E2 is: -3+10log(1-10^(-7 / 10))=-4dB.

[0078] The energy from the first port 1 to the third isolation port 34 of the third coupler D3 into the third load E3 is: -3+10log(1-10^(-7 / 10))=-4dB.

[0079] (1.2) When the power signal is input from the second port 2 (at this time, the first port 1 is the coupled output port, the second port 2 is the incident port, and the third port 3 is the direct output port), it reaches the first port 1 through the second coupled output port 22 of the second coupler D2, and the transmitted energy is -xdB-3dB.

[0080] After passing through the second transmission port 23 of the second coupler D2, it reaches the third transmission port 33 of the third coupler D3, and then passes through the main line of the third coupler D3 to reach the third port 3. The transmission energy at this time is calculated twice according to the formula 10log(1-10^(-x / 10)).

[0081] Taking x = 7dB as an example:

[0082] The energy (S12) from the second port 2 to the first port 1 is: -3dB + -7dB = -10dB;

[0083] The energy from the second port 2 to the third isolation port 34 of the third coupler D3 into the third load E3 is -7dB;

[0084] The energy (S32) from port 2 to port 3 is -2dB (the energy transmitted by the main line of the 7dB coupler is about 1dB (0.9691dB), and after passing through two 7dB couplers, it is 2dB).

[0085] (1.3) When the power signal is input from the third port 3 (at this time, the first port 1 is the coupled output port, the second port 2 is the direct output port, and the third port 3 is the incident port), it is the same as the second port 2 as the input in (1.2). Taking x = 7dB as an example, the energy from the third port 3 to the first port 1 (S13) is: -3dB + -7dB = -10dB; the energy from the third port 3 to the second port 2 (S23) is: -3dB + -7dB = -10dB. Since it is a reciprocal network, S21 = S12, S31 = S13, S23 = S32.

[0086] A reciprocal network refers to a reciprocal two-port network, which is a two-terminal network exhibiting reciprocity. Applying a current excitation to port m will generate a corresponding voltage at port n; applying the same current to port n will generate a corresponding voltage at port m. Therefore, the voltages generated at ports m and n are equal.

[0087] Therefore, the first port 1, the second port 2, and the third port 3 formed in the three-way coupler circuit described in this embodiment can simultaneously serve as input and output ports for high-power radio frequency signals. Each port (first port 1, second port 2, and third port 3) is matched, and the coupling of each port is mutually exclusive (i.e., S21 = S12, S31 = S13, S23 = S32). This achieves true three-port signal connectivity, enabling simultaneous use as input and output ports for high-power radio frequency signals. With any one port as input, the other two ports serve as branch outputs. This solves the technical problem in the prior art where the three ports of the coupler cannot simultaneously serve as input and output ports for high-power radio frequency signals, resulting in poor flexibility in use.

[0088] In addition, the three-way coupler circuit described in this embodiment can be used not only as a signal splitter of any frequency, but also as a frequency combiner. Moreover, there is no limit to the input power, and the maximum power depends on the rated power of the connected load, which meets the ultra-high flexibility requirements of indoor distribution system coverage.

[0089] 2. By changing the x value of the second coupler D2 and the third coupler D3, three-way couplers with various power levels can be obtained, and a series of products can be made. By changing the bandwidth design of the first coupler D1, the second coupler D2 and the third coupler D3, the broadband coverage requirements of this invention can be met, and signal synthesis and distribution of arbitrary frequencies can be realized.

[0090] Taking the first coupler D1 as a 3dB coupler as an example, the second coupler D2 and the third coupler D3 are xdB couplers. By changing the x value of the second coupler D2 and the third coupler D3, three-way couplers ranging from 6dB to 33dB can be obtained, allowing for the production of a series of products to meet various needs, such as:

[0091] When the first coupler D1 is a 3dB coupler and the second coupler D2 and the third coupler D3 are 7dB couplers, a 10dB three-way coupler can be obtained.

[0092] When the first coupler D1 is a 3dB coupler, and the second coupler D2 and the third coupler D3 are 3dB couplers, a 6dB (-3dB-3dB=-6dB) three-way coupler can be obtained. This is an equal-division three-way coupler (three-way bridge), that is, the energy transmitted by each input port is equal, which is also the maximum equal-division coupling amount that can be achieved in this embodiment.

[0093] When the first coupler D1 is a 3dB coupler and the second coupler D2 and the third coupler D3 are 12dB couplers, a 15dB (-3dB-12dB=-15dB) three-way coupler can be obtained.

[0094] When the first coupler D1 is a 3dB coupler and the second coupler D2 and the third coupler D3 are 17dB couplers, a 20dB (-3dB-17dB=-20dB) three-way coupler can be obtained.

[0095] As can be seen, by fixing the first coupler D1 and replacing different second couplers D2 and third couplers D3, a series of three-way coupler products can be obtained; by changing the bandwidth design of the first coupler D1, the second coupler D2 and the third coupler D3, the broadband coverage requirements of this invention can be met, and signal synthesis and distribution of any frequency can be realized.

[0096] Experimental verification

[0097] like Figure 4 As shown, a simulation of the effect of a 10dB three-way coupler implemented using the three-way coupler circuit described in this embodiment is performed, and the results are as follows. Figure 4 The simulation results are shown in the figure. Figure 4 It can be seen that the coupling from port 1 to port 2 and port 3 is about 10dB (-10.07dB), and the coupling from port 2 and port 3 to port 1 is also about 10dB (-10.87dB); the through insertion loss from port 2 to port 3 is about 2dB (-1.962dB), and the through insertion loss from port 3 to port 2 is also 2dB (-1.738dB).

[0098] As can be seen, the three ports formed in the three-way coupler circuit described in this embodiment can be used simultaneously as input and output ports for high-power radio frequency signals. Each port is matched, and the coupling of each port is different. Any one port can be used as an input, while the other two ports can be used as branch outputs, thus realizing true three-port signal interconnection.

[0099] In summary, the three-way coupler circuit or three-way coupler described in the embodiments of this application can be widely used in railway tunnels and large-scale residential communities where effective antenna coverage is required to improve user experience.

[0100] Taking railway tunnels as an example, wireless signal coverage in long tunnels requires leaky cables as the signal transmission carrier. However, due to the length of the tunnel and rapid signal attenuation, some tunnel sections often lack effective signal coverage, causing passengers to experience no mobile signal or dropped calls when passing through these sections. Using the three-way coupler circuit or three-way coupler described in this embodiment to add a signal source can improve signal coverage. This added signal can also serve as a backup base station for emergency communication.

[0101] For example, when upgrading coverage in older residential areas, one or more operator frequencies can be added to the existing system. The three-way coupler circuit or three-way coupler described in this embodiment can be used to connect to any location in the existing system.

[0102] The three-way coupler circuit or three-way coupler described in this application embodiment can be used not only as a signal splitter of any frequency, but also as a frequency combiner, and there is no limit to the input power (the maximum power depends on the rated power of the connected load). It is especially suitable for the ultra-high flexibility requirements of indoor distribution system coverage and has a very good performance.

[0103] Example 2

[0104] Based on the same inventive concept as the three-way coupler circuit in Embodiment 1 above, this embodiment also provides a three-way coupler circuit.

[0105] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that: the first coupling output port 12 is connected to the second isolation port 24, and the first transmission port 13 is connected to the third isolation port 34; the second coupling output port 22 is connected to the second load E2, and the third coupling output port 32 is connected to the third load E3.

[0106] All other implementation methods in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

[0107] Example 3

[0108] Based on the same inventive concept as the three-way coupler circuit in Embodiment 1 above, this embodiment also provides a three-way coupler circuit.

[0109] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that the second isolation port 24 and the third isolation port 34 are connected through the fourth load E4, that is, the second coupler D2 and the second coupler D3 share a load.

[0110] Specifically, the fourth load E4 can be a low intermodulation load or a normal load; there is no limitation, and the appropriate load type can be selected according to the actual situation. Other implementation methods in this embodiment are the same as in Embodiment 1, and will not be repeated here.

[0111] It should be understood that although quantifiers such as "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit.

[0112] The directional terms such as "outer," "middle," and "inner" mentioned or potentially used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0113] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of this application, and these improvements and additions should also be considered within the scope of protection of this invention. Any modifications, alterations, and equivalent variations made by those skilled in the art without departing from the spirit and scope of this application, based on the disclosed technical content, are equivalent embodiments of this application. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of this application still fall within the scope of the technical solution of this application.

Claims

1. A tee coupler circuit, characterized by, It is used for a three-way coupler, the three-way coupler circuit comprising: a first coupler, the first coupler being provided with a first input port; a second coupler, the second coupler being provided with a second input port; a third coupler, the third coupler being provided with a third input port; wherein the second coupler and the third coupler are coupled and connected, and the second coupler and the third coupler are symmetrically connected to the first coupler; the first input port, the second input port and the third input port are used to form three ports of the three-way coupler, and the ports are incident ports, coupled output ports or straight-through output ports; the first coupler further comprises a first coupled output port, a first transmission port and a first isolation port; the specific connection mode of the second coupler and the third coupler symmetrically connected to the first coupler is that the first coupled output port is connected to the second coupler, and the first transmission port is connected to the third coupler; the first isolation port is connected with a first load; the second coupler further comprises a second coupled output port, a second transmission port and a second isolation port; the third coupler further comprises a third coupled output port, a third transmission port and a third isolation port; the specific connection mode of the second coupler and the third coupler coupled and connected is that the second transmission port is connected to the third transmission port; and the second coupler and the third coupler are the same.

2. A tee coupler circuit as claimed in claim 1, characterized in that the specific connection mode of the second coupler and the third coupler symmetrically connected to the first coupler is that the first coupled output port is connected to the second coupled output port, and the first transmission port is connected to the third coupled output port; the second isolation port is connected with a second load, and the third isolation port is further connected with a third load.

3. A tee coupler circuit as claimed in claim 1, wherein, the specific connection mode of the second coupler and the third coupler symmetrically connected to the first coupler is that the first coupled output port is connected to the second isolation port, and the first transmission port is connected to the third isolation port; the second coupled output port is connected with a second load, and the third coupled output port is connected with a third load.

4. A tee-coupler circuit as claimed in claim 1, wherein, the specific connection mode of the second coupler and the third coupler symmetrically connected to the first coupler is that the first coupled output port is connected to the second coupled output port, and the first transmission port is connected to the third coupled output port; the second isolation port and the third isolation port are connected through a fourth load.

5. A tee-coupler circuit as claimed in claim 1, wherein, the first coupler is a 3dB coupler.

6. A tee-coupler circuit as claimed in claim 1, wherein, the second coupler and the third coupler are xdB couplers, and 3≤x≤30.

7. A tee-coupler circuit as claimed in claim 3, wherein, the second transmission port and the third transmission port are connected through a 50-ohm transmission line.

8. A tee coupler characterized by, the three-way coupler comprises a shell and the three-way coupler circuit as claimed in any one of claims 1-7, the three-way coupler circuit is packaged in the shell, and the incident port, the coupled output port and the straight-through output port are exposed outside the shell.

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