Sum-and-difference network structure and implementation method

Abstract

The application discloses a high-consistency and difference network structure and an implementation method, relates to the technical field of phased array antennas, and comprises a wideband and difference part and a power divider component, wherein the wideband and difference part comprises four 3dB coupling electric bridges and four 90° wideband phase shifters matched with the corresponding 3dB coupling electric bridges; the four 3dB coupling electric bridges and the four 90° wideband phase shifters are matched to superimpose and subtract input signals, and simultaneously output sum signals, x difference signals, y difference signals and double difference signals; the double difference signals are absorbed and matched through buried resistors and short-circuit branch links; the power divider component divides or combines the sum signals, the x difference signals and the y difference signals, and outputs the signals to a next-stage component. The application has reasonable design, and the wideband and difference network has good amplitude and phase consistency in the K wave band. The sum and difference beam forming network in this form has better processing consistency, greatly reduces production and assembly difficulty, and improves production efficiency and a good product rate in the assembly process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phased array antenna, more particularly to the technical field of high consistency and difference network structure and implementation method. BACKGROUND

[0002] With the rapid development of mobile communication, satellite communication and spaceborne electronics, the capacity requirement of the system is getting higher and higher. Since there are extremely rich spectrum resources in the high frequency microwave band, modern communication systems are developing towards high frequency microwave, especially millimeter wave band.

[0003] Phased array antenna, also known as electronic scanning antenna or electronic scanning array antenna, is developed from the initial array antenna. Since the phased array antenna has the ability to quickly change the beam pointing and beam shape, compared with the ordinary array antenna or parabolic antenna, the performance of the phased array system can be greatly improved, and more system functions can be realized. In the case of changes in working environment and observation target, the system and equipment have strong adaptive ability.

[0004] As a representative technical breakthrough, the millimeter wave phased array system realizes the directional transmission of large bandwidth millimeter wave signals by controlling the phase of the input signal in a large-scale antenna array, solving the problem of large path loss of millimeter wave signals. The development of this technology has made the millimeter wave phased array system widely used in military and civilian fields. For the problem of phased array direction finding, the single pulse method is the most widely used.

[0005] Single pulse angle measurement technology is a very mature precise angle measurement method, which not only has the advantages of small operation amount, simplicity and reliability, but more importantly, single pulse angle measurement technology has high data rate and strong anti-interference ability. In theory, single pulse angle measurement only needs to analyze one echo to extract angle error information (the angle of the target deviating from the beam center pointing). Therefore, it is not only applied to tracking system radars to realize precise tracking and measurement of targets, but also applied to various search system radars to improve angle measurement accuracy, and widely used in communication, radio astronomy, sonar and optical tracking fields.

[0006] The early monopulse angle measurement methods include amplitude comparison, phase comparison and sum-difference comparison. The amplitude comparison refers to that a phased array antenna feed system forms two beams with slightly offset directions but capable of covering a radar angle measurement region. The two beams receive echo signals and transmit the signals to a signal processor through respective receiving channels. The accurate position of a target can be determined by comparing the amplitudes of the two channel output signals. The phase comparison method refers to that a phased array antenna feed system forms two receiving beams with the same shape and direction but with different phase centers in height. The upper and lower receiving beams cover the same space domain. The position of a target can be obtained by measuring the phase difference between the two receiving beam signals. Compared with the amplitude comparison and the phase comparison, the sum-difference comparison monopulse angle measurement method does not require that the beams are fully symmetrical about the central axis, reduces the sources of angle measurement errors, is simple and effective, has small amount of calculation, and is widely used in many fields. At present, the monopulse comparison methods are not classified in detail, and the sum-difference comparison form is generally used.

[0007] The main components of the millimeter wave phased array antenna with the angle measurement function include an antenna array, a TR transceiver assembly, a sum-difference beam forming network, a wave controller, an antenna interface unit and a power module. The sum-difference network is the core system of the beam tracking function of the monopulse technology.

[0008] The traditional sum-difference device is composed of a magic T structure or a microstrip line. The magic T structure is too large, and the design and processing are difficult and high in cost, which is not suitable for an airborne platform. The traditional microstrip line sum-difference device is composed of a 3dB coupling bridge and a 90° microstrip delay line. The 90° microstrip delay line is a narrow-band structure that realizes phase shift by using a long microstrip line, has poor in-band flatness, finally affects the consistency of the entire sum-difference network, and has high assembly requirements for the microstrip line structure, so it is difficult to ensure high assembly consistency between products. SUMMARY

[0009] The purpose of the present application is to solve the technical problems that the traditional microstrip line sum-difference device is composed of a 3dB coupling bridge and a 90° microstrip delay line, and the amplitude and phase consistency and the assembly consistency of the entire sum-difference network are affected. The present application provides a high-consistency sum-difference network structure and implementation method. The strip line structure is composed of a 3dB coupling bridge and a 90° wideband phase shifter, has good in-band phase consistency and high production and assembly efficiency.

[0010] In order to achieve the above purpose, the present application specifically adopts the following technical solutions:

[0011] An aspect of the present application provides a high consistency and difference network structure, comprising a stripline PCB board assembly, the stripline PCB board assembly comprising a broadband and difference part and a power divider assembly, and the broadband and difference part is in a stripline structure, and the broadband and difference part comprises four 3dB coupling bridges and four 90° broadband phase shifters matched with the corresponding 3dB coupling bridges; the four 3dB coupling bridges and the four 90° broadband phase shifters are matched to superimpose and subtract the input signals, and simultaneously output sum signals, x difference signals, y difference signals and double difference signals, and the double difference signals are absorbed and matched through buried resistors and short-circuit branch links.

[0012] The power divider assembly divides or combines the sum signals, the x difference signals and the y difference signals, and outputs them to the next assembly.

[0013] Specifically, the sum and difference beam forming network has good amplitude and phase consistency.

[0014] In an embodiment, each 3dB coupling bridge is a three-branch stripline directional coupler, each three-branch stripline directional coupler comprises a main channel, a secondary channel and three coupling branch channels connected between the main channel and the secondary channel, and each three-branch stripline directional coupler further comprises two signal input ports connected to both ends of the main channel, and two signal output ports connected to both ends of the secondary channel.

[0015] Each three-branch stripline directional coupler uses the wave path difference of the microwave signal after passing through each coupling branch channel at different ports to make the same phase superposition at one signal output port and opposite phase cancellation at the other signal output port, thereby forming directional coupling of the microwave signal. Figure 2 As shown.

[0016] In an embodiment, the broadband and difference part comprises four signal input ports and four signal output ports, and the power divider assembly is arranged at the four signal input ports or the four signal output ports, and the power divider assembly divides or combines the signals and outputs them to the next assembly.

[0017] In an embodiment, the four 3dB coupling bridges are a first 3dB coupling bridge, a second 3dB coupling bridge, a third 3dB coupling bridge and a fourth 3dB coupling bridge, and each of the first 3dB coupling bridge, the second 3dB coupling bridge, the third 3dB coupling bridge and the fourth 3dB coupling bridge comprises two signal input ports and two signal output ports.

[0018] The four 90° broadband phase shifters are a first 90° broadband phase shifter, a second 90° broadband phase shifter, a third 90° broadband phase shifter and a fourth 90° broadband phase shifter.

[0019] One signal input port of the first 3dB coupling bridge is electrically connected with the first 90° wideband phase shifter, and one signal output port of the first 3dB coupling bridge enters one signal input port of the second 3dB coupling bridge through the second 90° wideband phase shifter; the other signal output port of the first 3dB coupling bridge enters one signal input port of the fourth 3dB coupling bridge through the fourth 90° wideband phase shifter.

[0020] One signal input port of the third 3dB coupling bridge is electrically connected with the third 90° wideband phase shifter; one signal output port of the third 3dB coupling bridge is electrically connected with the other signal input port of the second 3dB coupling bridge; and the other signal output port of the third 3dB coupling bridge is electrically connected with the other signal input port of the fourth 3dB coupling bridge.

[0021] In one embodiment, each 90° wideband phase shifter comprises a main channel and a reference channel, and the main channel is formed by cascading a coupling line and an open stub.

[0022] In one embodiment, the input end and the output end of the main channel are respectively connected with 50-ohm transmission lines; and the reference channel is formed by a transmission line with a characteristic impedance of 50 ohms.

[0023] Specifically, the 90° wideband phase shifter is a 90° wideband phase shifter based on the structure of a weakly coupled line cascaded with an open stub, and the circuit structure of the 90° wideband phase shifter is as shown in Figure 3 The main channel is formed by cascading a coupling line and an open stub, and the input end and the output end are respectively connected with 50-ohm transmission lines; and the reference channel is formed by a transmission line with a characteristic impedance of 50 ohms.

[0024] In one embodiment, the Wilkinson power dividers are provided with absorbing buried resistors at the output ports.

[0025] Specifically, the output ports of the Wilkinson power dividers are matched by Wilkinson 1 / 2+2 buried resistors+short-circuit stubs, and if one absorbing buried resistor fails during long-term use of the product, the absorbing performance of the overall structure will not be affected, thereby improving the long-term reliability of the structure.

[0026] In one embodiment, the conductive adhesive films are symmetrically arranged on the upper and lower surfaces of the stripline PCB assembly, the metal structural member cavities are attached to the outer sides of the conductive adhesive films, and the pressing plates are attached to the outer sides of the metal structural member cavities.

[0027] Another aspect of the present application provides an implementation method of a high-consistency and difference network structure, which is used for preparing the high-consistency and difference network structure, and the assembly mode adopts a full-automatic pressing mode, and comprises the following steps:

[0028] S1, preparation of components of the stripline PCB assembly: the hybrid combiner part, the power divider part, the stripline-to-coaxial transition section, the SMP connector pad, and the shielding column are integrated on the PCB board substrate, the power divider part is connected to the signal output port of the combiner part, the male port of the power divider part is matched to the SMP connector through the stripline-to-coaxial transition section, and then the SMP connector is through-plate welded by using a metallized via + metal pad;

[0029] S2, the conductive adhesive film is attached to the upper and lower surfaces of the stripline PCB assembly, then the metal structure cavity is attached to the outer side of each conductive adhesive film, finally the pressing plate is placed outside each metal structure cavity, and high-temperature pressing technology is used for pressing.

[0030] The beneficial effects of the present application are as follows:

[0031] The present application has reasonable design, and the wideband and difference network has good amplitude and phase consistency in the K band. Compared with the traditional microstrip line + structure cavity formed by manual welding, the and difference beam forming network of this form has better processing consistency, greatly reduces the production and assembly difficulty, improves the production efficiency and the good product rate in the assembly process. It can be widely used in engineering batch production tasks. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0033] Figure 1 is a structure diagram of a wideband and difference combiner part.

[0034] Figure 2 is a structure diagram of a 3dB coupled bridge.

[0035] Figure 3 is a structure diagram of a 90° wideband phase shifter.

[0036] Figure 4 is a structure diagram of a stripline PCB assembly.

[0037] Figure 5 is a high-consistency and difference network structure forming network schematic diagram.

[0038] Figure 6 is a structure diagram of a high-consistency and difference network structure. DETAILED DESCRIPTION

[0039] To make the technical problems, technical solutions, and technical effects of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0043] Example 1

[0044] like Figures 1 to 6 As shown, this embodiment provides a high consistency and low density network structure, including a stripline PCB board assembly, and also includes conductive adhesive films symmetrically arranged on the upper and lower surfaces of the stripline PCB board assembly, metal structural component cavities attached to the outside of each conductive adhesive film, and pressure plates attached to the outside of each metal structural component cavity.

[0045] The stripline PCB assembly includes a broadband sum and difference section and a power divider assembly. The sum and difference section is a stripline structure, comprising four 3dB coupled bridges and four 90° broadband phase shifters that cooperate with each corresponding 3dB coupled bridge. The four 3dB coupled bridges and four 90° broadband phase shifters work together to superimpose and subtract the input signals, and simultaneously output the sum signal, x-difference signal, y-difference signal, and double-difference signal. The double-difference signal is absorbed and matched by buried resistors and short-circuit stubs.

[0046] The power divider assembly divides or combines the sum signal, the x difference signal and the y difference signal and outputs to the next stage assembly.

[0047] In particular, the sum-difference beam forming network has good amplitude and phase consistency.

[0048] Embodiment 2

[0049] This embodiment is further optimized on the basis of embodiment 1, specifically:

[0050] Each 3dB coupling bridge is a three-branch stripline directional coupler, each three-branch stripline directional coupler includes a main channel, a secondary channel, and three coupling branch channels connected between the main channel and the secondary channel, and each three-branch stripline directional coupler further includes two signal input ports connected to both ends of the main channel, and two signal output ports connected to both ends of the secondary channel.

[0051] Each three-branch stripline directional coupler utilizes the wave path difference of the microwave signal after passing through each coupling branch channel at different ports, so that the three-branch stripline directional coupler in-phase superimposes at one signal output port and anti-phase cancels at the other signal output port, thereby forming directional coupling of the microwave signal. Figure 2 As shown.

[0052] Embodiment 3

[0053] This embodiment is further optimized on the basis of embodiment 2, specifically:

[0054] In one embodiment, the sum-difference part includes four signal input ports and four signal output ports, and the power divider assembly is arranged at the four signal input ports or the four signal output ports, and the power divider assembly divides or combines the signals and outputs to the next stage assembly.

[0055] In one embodiment, the four 3dB coupling bridges are a first 3dB coupling bridge, a second 3dB coupling bridge, a third 3dB coupling bridge, and a fourth 3dB coupling bridge, and the first 3dB coupling bridge, the second 3dB coupling bridge, the third 3dB coupling bridge, and the fourth 3dB coupling bridge each include two signal input ports and two signal output ports.

[0056] The four 90° wideband phase shifters are a first 90° wideband phase shifter, a second 90° wideband phase shifter, a third 90° wideband phase shifter, and a fourth 90° wideband phase shifter.

[0057] One of the signal input ports of the first 3dB coupling bridge is electrically connected with the first 90° wideband phase shifter, and one of the signal output ports of the first 3dB coupling bridge enters the other signal input port of the second 3dB coupling bridge through the second 90° wideband phase shifter; the other signal output port of the first 3dB coupling bridge enters one of the signal input ports of the fourth 3dB coupling bridge through the fourth 90° wideband phase shifter.

[0058] One of the signal input ports of the third 3dB coupling bridge is electrically connected with the third 90° wideband phase shifter; one of the signal output ports of the third 3dB coupling bridge is electrically connected with the other signal input port of the second 3dB coupling bridge; the other signal output port of the third 3dB coupling bridge is electrically connected with the other signal input port of the fourth 3dB coupling bridge.

[0059] Specifically, the whole sum-difference device part includes four signal input ports and four signal output ports, four input signals are set as signal 1, signal 2, signal 3 and signal 4, and four output signals are set as signal 5, signal 6, signal 7 and signal 8, and the signal superposition or subtraction process of the whole sum-difference device part is specifically as follows:

[0060] Signal 1 enters one of the signal input ports of the first 3dB coupling bridge through the first 90° wideband phase shifter; signal 2 directly enters the other signal input port of the first 3dB coupling bridge; signal 1 and signal 2 are superposed or subtracted in the first 3dB coupling bridge and then output signal 1+signal 2 and signal 1-signal 2 through two signal output ports respectively;

[0061] Signal 3 enters one of the signal input ports of the third 3dB coupling bridge through the third 90° wideband phase shifter; signal 4 directly enters the other signal input port of the third 3dB coupling bridge; signal 3 and signal 4 are superposed or subtracted in the third 3dB coupling bridge and then output signal 3+signal 4 and signal 3-signal 4 through two signal output ports respectively;

[0062] Signal 1+signal 2 enters one of the signal input ports of the second 3dB coupling bridge through the second 90° wideband phase shifter, and signal 3+signal 4 directly enters the other signal input port of the second 3dB coupling bridge; signal 1+signal 2 and signal 3+signal 4 are superposed or subtracted in the third 3dB coupling bridge and then output signal 5 and signal 6 through two signal output ports respectively, the final signal of signal 5 is signal 1+signal 2 signal 3+signal 4, and the final signal of signal 6 is signal 1+signal 2-signal 3-signal 4;

[0063] Signal 1 - signal 2 enters one signal input port of the fourth 3dB coupling bridge through the fourth 90° broadband phase shifter, and signal 3 - signal 4 directly enters the other signal input port of the fourth 3dB coupling bridge; the two-way signals of signal 1 - signal 2 and signal 3 - signal 4 are superimposed or subtracted in the fourth 3dB coupling bridge and then output signal 7 and signal 8 through two signal output ports, the final signal of signal 7 is signal 1 - signal 2 + signal 3 - signal 4, and the final signal of signal 8 is signal 1 - signal 2 - signal 3 + signal 4.

[0064] Embodiment 4

[0065] This embodiment is further optimized on the basis of embodiment 3, specifically:

[0066] Each 90° broadband phase shifter includes a main channel and a reference channel, the main channel is a coupling line cascaded with an open-circuit branch, the input end and the output end of the main channel are respectively connected with 50-ohm transmission lines; the reference channel is a transmission line with a characteristic impedance of 50 ohms.

[0067] Specifically, the 90° broadband phase shifter is a 90° broadband phase shifter based on the structure of a weakly coupled line cascaded with an open-circuit branch, the circuit structure of the 90° broadband phase shifter is as shown in Figure 3 The main channel is a coupling line cascaded with an open-circuit branch, the input end and the output end are respectively connected with 50-ohm transmission lines; the reference channel is a transmission line with a characteristic impedance of 50 ohms.

[0068] Embodiment 5

[0069] This embodiment is further optimized on the basis of any one of embodiments 1 to 4, specifically:

[0070] The Wilkinson power divider part adopts Wilkinson power dividers, and each output port of the Wilkinson power dividers is provided with an absorbing buried resistor.

[0071] Specifically, the output port of the Wilkinson power divider is matched by Wilkinson 1 / 2+2 buried resistors+short-circuit branch, and if one of the absorbing buried resistors fails during long-term use of the product, the absorbing performance of the overall structure will not be affected, thereby improving the long-term reliability of the part structure.

[0072] Embodiment 6

[0073] The embodiment provides an implementation method of a high-consistency and difference network structure, which is used for preparing the high-consistency and difference network structure, and adopts a full-automatic compression assembly mode, and includes the following steps:

[0074] S1, preparation of components of the stripline PCB assembly: the sum and difference device part, the power divider part, the stripline-to-coaxial transition section, the SMP connector pad, and the shielding column are integrated on the PCB board substrate, the power divider part is connected to the signal output port of the difference device part, the public split port of the power divider part is matched to the SMP connector by the stripline-to-coaxial transition section, and then the SMP connector is through-plate welded by using the metallized via + metal pad;

[0075] S2, the conductive adhesive film is attached to the upper and lower surfaces of the stripline PCB assembly, then the metal structure cavity is attached to the outer side of each conductive adhesive film, and finally the pressing plate is placed outside each metal structure cavity, and high-temperature pressing technology is used for pressing.

[0076] Specifically, four 6-port power dividers (i.e., four Wilkinson power dividers, each Wilkinson power divider including six power divider ports, and the four Wilkinson power dividers being distributed in four quadrants with six power divider ports in each quadrant) are selected as an example for detailed design and analysis. The power divider part uses a Wilkinson power divider, and since the number of power divider ports is not 2n, two power divider ports in each quadrant are matched by using a Wilkinson 1-to-2 + two buried resistors + short-circuit stubs (since the number of power divider ports of a Wilkinson power divider is 2n, when six power divider ports are needed, a Wilkinson power divider with 23 power divider ports is selected, and two power divider ports are absorbed and matched), as shown in 1 of Figure 4

[0077] The stripline output ports are matched to the SMP connector by using a stripline-to-coaxial transition section, so that the SMP connector is through-plate welded by using the metallized via + metal pad. Finally, the 1-to-24 and difference beam forming network is processed and assembled by using high-temperature pressing technology, and the sum and difference beam forming network is composed of sum, x-difference, y-difference, and 24 split ports. The circuit size is 85mm*84mm, the thickness is 1.15mm, and the circuit board is completely assembled, pressed with the metal structure cavity and the pressing plate.​

Claims

1. A sum-difference network structure, characterized in that, The system includes a stripline PCB assembly, comprising a broadband sum and difference section and a power divider assembly. The sum and difference section is a stripline structure, comprising four 3dB coupled bridges and four 90° broadband phase shifters that cooperate with each corresponding 3dB coupled bridge. The four 3dB coupled bridges and the four 90° broadband phase shifters cooperate to superimpose and subtract the input signals, and simultaneously output a sum signal, an x-difference signal, a y-difference signal, and a double-difference signal. The double-difference signal is absorbed and matched by buried resistors and short-circuit stubs. The power divider component will split or combine the sum signal, x difference signal, and y difference signal, and output them to the next stage component. Each of the 3dB coupling bridges uses a three-branch stripline directional coupler. Each of the three-branch stripline directional couplers includes a main channel, a secondary channel, and three coupling branch channels connected between the main channel and the secondary channel. Each of the three-branch stripline directional couplers also includes two signal input ports connected to both ends of the main channel and two signal output ports connected to both ends of the secondary channel. Each of the three-branch stripline directional couplers utilizes the path difference at different ports after the microwave signal passes through each of the coupling branch channels, so that the signal output ports of the three-branch stripline directional coupler are in phase and superimposed, while the signal output ports are out of phase and cancel each other, thereby forming directional coupling of microwave signals. Each of the 90° broadband phase shifters includes a main channel and a reference channel, wherein the main channel is cascaded with an open-circuit stub by a coupling line.

2. The sum-difference network structure according to claim 1, characterized in that, The sum and difference section includes four signal input ports and four signal output ports. The power divider component is located at the four signal input ports or the four signal output ports. The power divider component realizes the power division or power combination of the signal and outputs it to the next stage component.

3. The sum-difference network structure according to claim 2, characterized in that, The four 3dB coupling bridges are designated as 3dB coupling bridge No. 1, 3dB coupling bridge No. 2, 3dB coupling bridge No. 3, and 3dB coupling bridge No.

4. Each of the four 3dB coupling bridges includes two signal input ports and two signal output ports. The four 90° broadband phase shifters are designated as No. 1, No. 2, No. 3, and No. 4 90° broadband phase shifters. One of the signal input ports of the first 3dB coupling bridge is electrically connected to the first 90° broadband phase shifter, and one of the signal output ports of the first 3dB coupling bridge enters one of the signal input ports of the second 3dB coupling bridge through the second 90° broadband phase shifter. The other signal output port of the No. 1 3dB coupled bridge enters one signal input port of the No. 4 3dB coupled bridge through the No. 4 90° broadband phase shifter; One of the signal input ports of the No. 3 3dB coupling bridge is electrically connected to the No. 3 90° broadband phase shifter; one of the signal output ports of the No. 3 3dB coupling bridge is electrically connected to the other signal input port of the No. 2 3dB coupling bridge; and the other signal output port of the No. 3 3dB coupling bridge is electrically connected to the other signal input port of the No. 4 3dB coupling bridge.

4. The sum-difference network structure according to claim 3, characterized in that, The input and output terminals of the main channel are each connected to a 50-ohm transmission line; the reference channel consists of a transmission line with a characteristic impedance of 50 ohms.

5. The sum-difference network structure according to claim 1, characterized in that, The power divider section uses Wilkinson power dividers, and each Wilkinson power divider's output port is equipped with an absorption resistor.

6. The sum-difference network structure according to claim 5, characterized in that, It also includes conductive adhesive films symmetrically arranged on the upper and lower sides of the strip PCB board assembly, metal structural cavity attached to the outside of each conductive adhesive film, and pressure plate attached to the outside of each metal structural cavity.

7. A method for implementing a sum-difference network structure, characterized in that, The assembly method for preparing the sum-difference network structure according to any one of claims 1 to 6 is a fully automated pressing method.

8. The method for implementing a sum-difference network structure according to claim 7, characterized in that, Includes the following steps: S1. Fabrication of components of the stripline PCB board assembly: The sum and difference section, the power divider section, the stripline to coaxial transition section, the SMP connector pads, and the shielding post are integrated on the PCB board substrate. The power divider section is connected to the signal output port of the sum and difference section. The power divider port of the power divider section is matched to the SMP connector using the stripline to coaxial transition section. Then, the SMP connector is soldered through the board using metallized vias and metal pads. S2. A conductive adhesive film is attached to the upper and lower surfaces of the strip PCB board assembly. Then, a metal structural component cavity is attached to the outside of each conductive adhesive film. Finally, a pressure plate is placed on the outside of each metal structural component cavity, and high-temperature pressing technology is used for pressing.

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