Broadband Microstrip Signal Sum and Difference Device

Abstract

The embodiment of the present invention relates to the field of microwave communication technology, and discloses a broadband microstrip signal sum difference device, wherein the main wiring layer includes four ‑90° phase shifters, four ‑180° phase compensators, and the first 3db bridge, the second 3db bridge, the third 3db bridge, and the fourth 3db bridge, which are sequentially connected to form a ring network in a clockwise direction; one of the two input ends of the first 3db bridge is connected to a ‑90° phase shifter, and the other is connected to a ‑180° phase compensator, and one of the two output ends of the first 3db bridge is connected to a ‑90° phase shifter, and the other is connected to a ‑180° phase compensator; one of the two input ends of the third 3db bridge is connected to a ‑90° phase shifter, and the other is connected to a ‑180° phase compensator, and one of the two output ends of the third 3db bridge is connected to a ‑180° phase compensator, and the other is connected to a ‑90° phase shifter. Through the above wiring combination, a broadband microstrip signal sum difference device with better integration, more stable performance and higher consistency is achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of microwave communication technology, and in particular to a broadband microstrip signal sum and difference device. Background Art

[0002] In microwave radar antenna systems, signal sum and difference devices are essential components. In Ku-band radars, sum and difference devices composed of waveguide sum and difference devices or radio frequency components are often used.

[0003] In the process of implementing the prior art, the inventors found that although the existing waveguide summators have the advantages of large power capacity and low loss, they are not convenient to be integrated into small radar systems due to their large size; and the summators composed of RF microwave components are small in size, but due to too many connection points among the components, due to process reasons, they are prone to large output amplitude and phase deviations, thus affecting the stability of the system, and the product consistency is poor, and the product cost is also high.

[0004] Therefore, the signal summator in the existing miniaturized radar antenna system has problems such as volume, stability, power capacity and production cost that cannot be taken into account at the same time. Summary of the invention

[0005] In view of the above problems, an embodiment of the present invention provides a broadband microstrip signal sum and difference device, which is used to solve the problem that the signal sum and difference device in a miniaturized radar antenna system in the prior art cannot take into account the volume, stability, power capacity and production cost.

[0006] According to one aspect of an embodiment of the present invention, a broadband microstrip signal sum and difference device is provided, wherein the main wiring layer of the broadband microstrip signal sum and difference device comprises four -90° phase shifters, four -180° phase compensators, and a first 3db bridge, a second 3db bridge, a third 3db bridge, and a fourth 3db bridge which are sequentially connected in a clockwise direction to form a ring network;

[0007] Among them, one of the two input ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator, one of the two output ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; one of the two input ends of the third 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator, one of the two output ends of the third 3db bridge is connected to a -180° phase compensator, and the other is connected to a -90° phase shifter;

[0008] The second 3db bridge is connected across the -180° phase compensator connected to the output end of the first 3db bridge and the -90° phase shifter connected to the output end of the third 3db bridge;

[0009] The fourth 3db bridge is connected across the -90° phase shifter connected to the output end of the first 3db bridge and the -180° phase compensator connected to the output end of the third 3db bridge.

[0010] In an optional manner, the first end of the first -180° phase compensator is the first signal input end of the broadband microstrip signal sum-differentiator; the first end of the first -90° phase shifter is the second signal input end of the broadband microstrip signal sum-differentiator;

[0011] The second end of the first -90° phase shifter is connected to an input end of the first 3db bridge;

[0012] The second end of the first -180° phase compensator is connected to the other input end of the first 3db bridge;

[0013] One output end of the first 3db bridge is connected to a first end of a second -180° phase compensator;

[0014] The other output end of the first 3db bridge is connected to the first end of the second -90° phase shifter;

[0015] The second end of the second -180° phase compensator is connected to an input end of the second 3db bridge; one output end of the second 3db bridge is the sum signal output end of the broadband microstrip signal sum-differentiator, and the other output end is respectively the first difference signal output end of the broadband microstrip signal sum-differentiator; the other input end of the second 3db bridge is connected to the second end of the fourth -90° phase shifter;

[0016] The second end of the second -90° phase shifter is connected to an input end of the fourth 3db bridge; one output end of the fourth 3db bridge is the second difference signal output end of the broadband microstrip signal sum difference device, and the other output end is respectively the useless signal output end of the broadband microstrip signal sum difference device, which is connected to a matching load when in use; the other input end of the fourth 3db bridge is connected to the second end of the fourth -180° phase compensator;

[0017] The first end of the third -90° phase shifter is the third signal input end of the broadband microstrip signal sum-differential device;

[0018] The first end of the third -180° phase compensator is the fourth signal input end of the broadband microstrip signal sum-and-differential device;

[0019] The second end of the third -90° phase shifter is connected to an input end of the third 3db bridge;

[0020] The second end of the third -180° phase compensator is connected to the other input end of the third 3db bridge;

[0021] One output end of the third 3db bridge is connected to the first end of the fourth -180° phase compensator; the other output end of the third 3db bridge is connected to the first end of the fourth -90° phase shifter.

[0022] In an optional manner, the microstrip board includes a first microstrip board and a second microstrip board; the wiring surface of the first microstrip board is glued to the blank surface of the second microstrip board, and the respective copper-clad surfaces face the metal cavity shell; the wiring surface of the first microstrip board is the main wiring layer, and the first microstrip board and the second microstrip board are provided with through holes at positions corresponding to the input port and output port of the broadband microstrip signal summator.

[0023] In an optional manner, the broadband microstrip signal summator also includes a radio frequency connector; one radio frequency connector corresponds to one of the through holes.

[0024] In an optional manner, the RF connector is an ultra-small push-in RF coaxial connector; the input port and the output port of the broadband microstrip signal summator are welded to the corresponding inner conductor of the ultra-small push-in RF coaxial connector through the corresponding through holes on the second microstrip board and the through holes on the first microstrip board.

[0025] In an optional manner, the broadband microstrip signal summator also includes a metal cavity; and the microstrip board is arranged inside the metal cavity.

[0026] In an optional manner, the center of the microstrip board is fixed to an inner wall of one side of the metal cavity by screws.

[0027] In an optional manner, the height inside the metal cavity is consistent with the height of the microstrip board, and the outer height is the sum of the heights required for preset parts assembly.

[0028] In an optional manner, the metal cavity is made of aluminum; each network port and its lead in the main wiring of the first microstrip board in the broadband microstrip signal summator are 50 ohm impedance lines.

[0029] The broadband microstrip signal sum-differentiator provided in the embodiment of the present invention comprises four -90° phase shifters, four -180° phase compensators, and a first 3db bridge, a second 3db bridge, a third 3db bridge, and a fourth 3db bridge which are sequentially connected in a clockwise direction to form a ring network;

[0030] Among them, one of the two input ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator, one of the two output ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; one of the two input ends of the third 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator, one of the two output ends of the third 3db bridge is connected to a -180° phase compensator, and the other is connected to a -90° phase shifter; the second 3db bridge is connected between the -180° phase compensator connected to the output end of the first 3db bridge and the -90° phase shifter connected to the output end of the fourth 3db bridge; the fourth 3db bridge is connected between the -90° phase shifter connected to the output end of the first 3db bridge and the fourth -180° phase compensator connected to the output end of the third 3db bridge. Therefore, it is different from the existing waveguide signal summator which is large in size and not convenient to be integrated into a small radar system, and the summator composed of radio frequency microwave components has too many component connection points, and due to process reasons, it is easy to cause large output amplitude and phase deviation, thereby affecting the stability of the system, as well as poor product consistency and high product cost. The embodiment of the present invention realizes the miniaturization and easy integration of the broadband signal summator through a microstrip network. At the same time, in order to ensure the stability of the summator, the embodiment of the present invention not only performs sum and difference calculation through a 3db bridge and a -90° phase shifter, but also introduces a -180° phase compensator at the corresponding port of each -90° phase shifter, so as to perform phase slope compensation through the -180° phase compensator, reduce the phase deviation between high and low frequency signals, and keep the error of signal amplitude or phase within a certain allowable range within a broadband range, so that the product performance is stable and reliable. Therefore, the broadband microstrip signal summator provided by the embodiment of the present invention has the advantages of small size, high stability, wide bandwidth, low production cost, and easy system integration.

[0031] More preferably, the microstrip board in the embodiment of the present invention can be a double-layer microstrip board, and specific wiring of the microstrip circuit is performed on the upper layer of the first layer to form the aforementioned broadband microstrip signal sum and difference device, and then the first layer and the second layer are combined in a laminated manner, and the wiring layer of the broadband microstrip signal sum and difference device is in the middle of the two boards. Combined with a metal aluminum cavity and a radio frequency coaxial connector, etc., a small integrated broadband signal sum and difference device in the Ku band is realized, which can be used to compare the azimuth difference and elevation difference of the amplitude or phase of the radar antenna signal at the same time, thereby realizing highly integrated and high-performance signal sum and difference calculation in a miniaturized radar.

[0032] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0034] Figure 1 A schematic diagram of the main wiring of a microstrip board in a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0035] Figure 2a A back view of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0036] Figure 2b A main top view of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0037] Figure 2c A side view of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0038] Figure 3a A schematic diagram of the copper-clad surface of the first microstrip board in the broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0039] Figure 3b A schematic diagram showing a wiring surface of a first microstrip board in a broadband microstrip signal sum and subtraction device provided by an embodiment of the present invention is shown;

[0040] Figure 4a A schematic diagram showing a blank surface of a second microstrip plate in a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0041] Figure 4b A schematic diagram of the copper-clad surface of the second microstrip board in the broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0042] Figure 5 A three-dimensional diagram of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0043] Figure 6 A simulation effect diagram of the standing wave ratio of each port of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown;

[0044] Figure 7 A simulation effect diagram of the input port isolation of a broadband microstrip signal sum-difference device provided by an embodiment of the present invention is shown;

[0045] Figure 8 A simulation effect diagram of the output port isolation of a broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown;

[0046] Fig. 9 A simulation effect diagram of the passband insertion loss of the sum signal output end of the broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown;

[0047] Fig.10 A simulation effect diagram of the passband insertion loss of the first difference signal output end of the broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown;

[0048] Fig.11 A simulation effect diagram of the passband insertion loss of the second difference signal output end of the broadband microstrip signal sum-differentiator provided by an embodiment of the present invention is shown;

[0049] Fig.12 A simulation effect diagram of the phase difference at the sum signal output end of the broadband microstrip signal sum-subtractor provided by an embodiment of the present invention is shown;

[0050] Fig.13 A simulation effect diagram of the phase difference at the first difference signal output end of the broadband microstrip signal sum-differentiator provided by an embodiment of the present invention is shown;

[0051] Fig.14 The diagram shows the simulation effect of the phase difference at the second difference signal output end of the broadband microstrip signal sum-differentiator provided by the embodiment of the present invention.

[0052] In the above drawings: microstrip board 01, first 3db bridge 101, second 3db bridge 102, third 3db bridge 103, fourth 3db bridge 104, first -90° phase shifter 201, first -180° phase compensator 301, second -90° phase shifter 202, second -180° phase compensator 302, third -90° phase shifter 203, third -180° phase compensator 303, fourth -90° phase shifter 204, fourth -180° phase compensator 304, first signal input terminal in1, second signal input terminal in2, third signal input terminal in3, fourth signal input terminal in4, sum signal output terminal out1, first difference signal output terminal out2, second difference signal output terminal out3, useless information output terminal out4, first microstrip board 011, second microstrip board 012, through hole 30, RF connector 40, metal cavity 50. DETAILED DESCRIPTION

[0053] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0054] Related terms:

[0055] 3db bridge: a frequency combiner that can continuously sample the transmission power along a certain direction of the transmission line and can divide an input signal into two signals of equal amplitude and 90° phase difference. It is mainly used for combining multiple signals to improve the utilization rate of output signals and is widely used for combining base station signals in indoor coverage systems.

[0056] Phase shift: Control the phase of the input signal (usually a sine wave) without changing its amplitude.

[0057] Figure 1 FIG. 2 shows a structural diagram of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention. Figure 1 As shown, the broadband microstrip signal summator includes a microstrip board 01; the main wiring layer of the microstrip board 01 includes four -90° phase shifters, four -180° phase compensators, and a first 3db bridge 101, a second 3db bridge 102, a third 3db bridge 103, and a fourth 3db bridge 104 which are sequentially connected in a clockwise direction to form a ring network, wherein:

[0058] like Figure 1 As shown, one of the two input ends of the first 3db bridge 101 is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator;

[0059] One of the two output ends of the first 3db bridge 101 is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator;

[0060] One of the two input ends of the third 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator;

[0061] One of the two output ends of the third 3db bridge is connected to a -180° phase compensator, and the other is connected to a -90° phase shifter;

[0062] The second 3db bridge is connected across the -180° phase compensator connected to the output end of the first 3db bridge and the -90° phase shifter connected to the output end of the third 3db bridge;

[0063] The fourth 3db bridge is connected across the -90° phase shifter connected to the output end of the first 3db bridge and the -180° phase compensator connected to the output end of the third 3db bridge.

[0064] Specifically, Figure 1The four -90° phase shifters, four -180° phase compensators, and the first 3db bridge 101, the second 3db bridge 102, the third 3db bridge 103, and the fourth 3db bridge 104 connected in a clockwise direction to form a ring network constitute a broadband microstrip signal sum and difference device. The first 3db bridge 101 and the third 3db bridge 103 are bridges for receiving input signals outside the broadband microstrip signal sum and difference device, and the second 3db bridge 102 and the fourth 3db bridge 104 are bridges for outputting signals outside the broadband microstrip signal sum and difference device. The microstrip board 01 can be made of a material with high dielectric and low loss. By wiring the broadband microstrip signal sum and difference device on the microstrip board 01 to realize broadband sum and difference calculation, the volume of the broadband microstrip signal sum and difference device can be effectively reduced, and it is more suitable for integration into a miniaturized radar system. At the same time, the microstrip board 01 can be formed by integrated printing and pressing, and the processing method is simpler. Compared with the use of RF microwave components to form a summator, the broadband microstrip signal summator of the embodiment of the present invention does not have too many component connection points, thereby avoiding the problem of poor performance of the signal summator caused by the processing technology.

[0065] On the basis of basic sum and difference calculation through 3D bridge and -90° phase shifter, taking into account the phase difference between high-frequency signal and low-frequency signal, in order to improve the performance of broadband microstrip signal sum and difference device, by connecting a -180° phase compensator to an input end and an output end of the first 3DB bridge 101 / the third 3DB bridge 103 respectively, on the logical basis of the sum and difference calculation of the broadband microstrip signal sum and difference device, the sum and difference calculation with phase slope compensation of the input broadband microstrip signal and the signal outside the sum and difference device is realized, ensuring that the error of the sum and difference device signal amplitude or phase within the broadband range is within an acceptable range, making the performance of the broadband microstrip signal sum and difference device more stable and reliable.

[0066] Specifically, refer to Figure 1 , the first end of the first -180° phase compensator 301 is the first signal input end in1 of the broadband microstrip signal sum-differentiator; the first end of the first -90° phase shifter 201 is the second signal input end in2 of the broadband microstrip signal sum-differentiator;

[0067] The second end of the first -90° phase shifter 201 is connected to an input end of the first 3db bridge 101;

[0068] The second end of the first -180° phase compensator 301 is connected to the other input end of the first 3db bridge 101;

[0069] One output end of the first 3db bridge 101 is connected to a first end of the second -180° phase compensator 302;

[0070] The other output end of the first 3db bridge 101 is connected to the first end of the second -90° phase shifter 202;

[0071] The second end of the second -180° phase compensator 302 is connected to an input end of the second 3db bridge 102; one output end of the second 3db bridge is the sum signal output end out1 of the broadband microstrip signal sum-differentiator, and the other output end is respectively the first difference signal output end out2 of the broadband microstrip signal sum-differentiator; the other input end of the second 3db bridge 102 is connected to the second end of the fourth -90° phase shifter 204;

[0072] The second end of the second -90° phase shifter 202 is connected to an input end of the fourth 3db bridge 104; one output end of the fourth 3db bridge 104 is the second difference signal output end out3 of the broadband microstrip signal sum difference device, and the other output end is the useless signal output end out4 of the broadband microstrip signal sum difference device, which is connected to a matching load when in use; the other input end of the fourth 3db bridge 104 is connected to the second end of the fourth -180° phase compensator 304;

[0073] The first end of the third -90° phase shifter 203 is the third signal input end in3 of the broadband microstrip signal sum-differential device;

[0074] The first end of the third -180° phase compensator 303 is the fourth signal input end in4 of the broadband microstrip signal sum-differential device;

[0075] The second end of the third -90° phase shifter 203 is connected to an input end of the third 3db bridge 103;

[0076] The second end of the third -180° phase compensator 303 is connected to the other input end of the third 3db bridge 103;

[0077] One output end of the third 3db bridge 103 is connected to a first end of the fourth -180° phase compensator 304 ; the other output end of the third 3db bridge 103 is connected to a first end of the fourth -90° phase shifter 204 .

[0078] like Figure 1 As shown, when the broadband microstrip signal sum and difference device is in working state, that is, when there is a signal input at each input port of the broadband microstrip signal sum and difference device, the logical relationship between the input signal and the signal output from the output port of the broadband microstrip signal sum and difference device is as follows:

[0079] And signal output terminal out1 = in1 + in2 + in3 + in4;

[0080] First difference signal output terminal out2 = (in1 + in2) - (in3 + in4);

[0081] The second difference signal output terminal out3 = (in2 + in3) - (in1 + in4).

[0082] It can be seen that the first 3db bridge 101, the second 3db bridge 102, the third 3db bridge 103, the fourth 3db bridge 104, which are connected in a clockwise direction to form a ring network in the broadband microstrip signal sum and difference device, and the two -90° phase shifters respectively connected to the above four 3db bridges are the logical basis for realizing the sum and difference calculation, and the two -180° phase compensators respectively connected to the above four 3db bridges perform phase slope compensation on the signal during the sum and difference calculation process, thereby improving the performance stability of the broadband microstrip signal sum and difference device.

[0083] Optionally, in order to further realize the miniaturization and integration of broadband microstrip signal and differential devices and make the microstrip board 01 more convenient to process, the broadband microstrip signal and differential devices can be wired on a single-layer board in a double-layer board, and then the double-layer boards are pressed together to obtain the microstrip board 01.

[0084] Specifically, refer to Figure 2a to Figure 4b The microstrip board 01 includes a first microstrip board 011 and a second microstrip board 012; the wiring surface of the first microstrip board 011 is glued to the blank surface of the second microstrip board 012, and the respective copper-clad surfaces face the metal cavity shell; the wiring surface of the first microstrip board 011 is the main wiring layer; the first microstrip board 011 and the second microstrip board 012 are provided with through holes 30 at positions corresponding to the input port and output port of the broadband microstrip signal summator.

[0085] Specifically, the first microstrip board 011 and the second microstrip board 012 have the same size, and both can use high dielectric and low loss microstrip boards 01. The first microstrip board 011 and the second microstrip board 012 are glued by lamination, and the copper-clad surfaces of the first microstrip board 011 and the second microstrip board 012 face outwards.

[0086] By providing a through hole 30 on the second microstrip board 012 , space is reserved for the connection between the portion of the wiring surface of the first microstrip board 011 corresponding to the input port and the output port and the external device.

[0087] In order to further improve the integration and availability of broadband microstrip signal and difference devices, reference Figure 5 The broadband microstrip signal summator also includes a radio frequency connector 40 ; one radio frequency connector 40 corresponds to one through hole 30 .

[0088] The RF connector 40 is used to connect the broadband microstrip signal and the difference device to an external device such as an external radar system. The type of the RF connector 40 can be a commonly used RF interface type. The RF connector 40 can be selected as needed according to the needs of indicators such as frequency range, impedance, withstand voltage, standing wave ratio, and size in different scenarios.

[0089] Specifically, the RF connector 40 is an ultra-small push-in RF coaxial connector; the input port and the output port of the broadband microstrip signal summator are welded to the conductor in the corresponding ultra-small push-in RF coaxial connector through the corresponding through holes on the first microstrip board and the through holes on the second microstrip board 30.

[0090] The ultra-small push-in RF coaxial connector is the SMP RF coaxial connector. The ultra-small push-in RF coaxial connector can further improve the adaptability and integration of broadband microstrip signal summators and small radars.

[0091] In yet another embodiment of the present invention, reference Figure 2a to Figure 5 The broadband microstrip signal summator also includes a metal cavity 50; the microstrip board 01 is arranged inside the metal cavity 50; and the connection port of the RF connector 40 that is not connected to the microstrip board 01 is exposed to the metal cavity 50.

[0092] It is understandable that the two side connection ports of the RF connector 40 are connected to the external device to be detected outside the metal cavity 50 with the microstrip board 01. By packaging the RF connector 40 together with the microstrip board 01 into the metal cavity 50, the integration of the broadband microstrip signal and the difference device is improved, while avoiding external interference. The material of the metal cavity 50 can be a relatively light metal with good heat dissipation such as aluminum.

[0093] Furthermore, inside the metal cavity 50 , in order to improve the stability of the microstrip board 01 , the center of the microstrip board 01 is fixed to an inner wall of one side of the metal cavity 50 by screws.

[0094] The screws may be stainless steel screws. By fixing the microstrip board 01 in the metal cavity 50, the usability and stability of the product are further improved.

[0095] Furthermore, in order to further reduce the size of the broadband microstrip signal sum and difference device and improve its miniaturization, the height inside the metal cavity 50 is consistent with the height of the microstrip board 01, and the outer height is the sum of the preset heights required for parts assembly.

[0096] Specifically, the height of the metal cavity 50 is substantially the same as the total height of the two layers of microstrip board 01 after lamination, and a mounting gap of about 0.2 mm is reserved to accommodate the error caused by processing.

[0097] The metal cavity 50 is made of aluminum; each network port and its lead wire in the main wiring surface of the first microstrip board in the broadband microstrip signal summator are 50 ohm impedance wires.

[0098] The electrical performance index requirements of the Ku-band broadband microstrip signal and difference device provided in the embodiment of the present invention are as follows: 1. Frequency range: 14-18GHz; 2. Passband insertion loss: ≤9dB; 3. Port isolation ≥20dB; 4. Port standing wave ratio: ≤1.6; 5. Phase consistency of the same frequency point in the passband: ≤±8°. Through computer simulation, the S parameter simulation effect of the broadband microstrip signal and difference device provided in this embodiment is as follows: Figure 6-Figure 14 As shown. The corresponding ports in the S parameters are as follows: port 1 corresponds to the sum signal output end out1, port 2 corresponds to the first difference signal output end out2, port 3 corresponds to the second difference signal output end out3, port 4 corresponds to the third signal input end in3, port 5 corresponds to the fourth signal input end in4, port 6 corresponds to the first signal input end in1, port 7 corresponds to the second signal input end in2, out4 is a useless signal end and is not listed in the S parameters. Among them, Figure 6 A simulation effect diagram of the standing wave ratio of each port of a broadband microstrip signal sum and difference device provided by an embodiment of the present invention is shown; Figure 7 A simulation effect diagram of the input port isolation of a broadband microstrip signal sum-difference device provided by an embodiment of the present invention is shown; Figure 8 A simulation effect diagram of the output port isolation of a broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown; Fig. 9 A simulation effect diagram of the passband insertion loss of the sum signal output end of the broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown; Fig.10 A simulation effect diagram of the passband insertion loss of the first difference signal output end of the broadband microstrip signal sum-differential device provided by an embodiment of the present invention is shown; Fig.11 A simulation effect diagram of the passband insertion loss of the second difference signal output end of the broadband microstrip signal sum-differentiator provided by an embodiment of the present invention is shown; Fig.12 A simulation effect diagram of the phase difference at the sum signal output end of the broadband microstrip signal sum-subtractor provided by an embodiment of the present invention is shown; Fig.13 A simulation effect diagram of the phase difference at the first difference signal output end of the broadband microstrip signal sum-differentiator provided by an embodiment of the present invention is shown; Fig.14 The simulation effect diagram of the phase difference of the second difference signal output end of the broadband microstrip signal sum difference device provided by the embodiment of the present invention is shown. Figure 6-Figure 14 It can be seen that the indicators of the broadband microstrip signal sum and difference device provided by the embodiment of the present invention meet the design requirements. The broadband microstrip signal sum and difference device provided by the embodiment of the present invention has stable and reliable performance, and has the advantages of small size, high stability, wide bandwidth, low production cost, and easy system integration.

[0099] Preferably, the microstrip board 01 in the embodiment of the present invention can be a double-layer microstrip board, and the broadband microstrip signal sum and difference device are wired on the upper layer of the first microstrip board 011, and then the first microstrip board 011 and the second microstrip board 012 are combined in a laminated manner, and the wiring layer of the broadband microstrip signal sum and difference device is in the middle of the two boards. Combined with the metal cavity 50 and the RF coaxial connector, etc., a Ku-band small integrated broadband signal sum and difference device is realized, which can be used to compare the azimuth difference and pitch difference of the amplitude or phase of the radar antenna signal at the same time, thereby realizing highly integrated and high-performance sum and difference calculation in a miniaturized radar.

[0100] The algorithm or display provided herein is not inherently related to any particular computer, virtual system or other equipment. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious to construct the structure required for this type of system. In addition, the embodiment of the present invention is not directed to any specific programming language yet. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described herein, and the description made to specific languages ​​above is for disclosing the best mode of the present invention.

[0101] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0102] Similarly, it should be understood that in order to streamline the present invention and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than those expressly recited in each claim.

[0103] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0104] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be understood as limitations on the order of execution.

Claims

1. A broadband microstrip signal sum-differential device, characterized in that: The main wiring layer of the broadband microstrip signal sum and difference device includes four -90° phase shifters, four -180° phase compensators, and a first 3db bridge, a second 3db bridge, a third 3db bridge, and a fourth 3db bridge which are sequentially connected in a clockwise direction to form a ring network; wherein one of the two input ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; one of the two output ends of the first 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; one of the two input ends of the third 3db bridge is connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; the two output ends of the third 3db bridge are connected to a -90° phase shifter, and the other is connected to a -180° phase compensator; One of the output ends is connected to a -180° phase compensator, and the other is connected to a -90° phase shifter; the first end of the first -180° phase compensator is the first signal input end of the broadband microstrip signal sum and difference device; the first end of the first -90° phase shifter is the second signal input end of the broadband microstrip signal sum and difference device; the first end of the third -90° phase shifter is the third signal input end of the broadband microstrip signal sum and difference device; the first end of the third -180° phase compensator is the fourth signal input end of the broadband microstrip signal sum and difference device; the second 3db bridge is connected across the -180° phase compensator connected to the output end of the first 3db bridge and the -90° phase shifter connected to the output end of the third 3db bridge; The fourth 3db bridge is connected across the -90° phase shifter connected to the output end of the first 3db bridge and the -180° phase compensator connected to the output end of the third 3db bridge.

2. The broadband microstrip signal summator according to claim 1, characterized in that: The second end of the first -90° phase shifter is connected to an input end of the first 3db bridge; the second end of the first -180° phase compensator is connected to the other input end of the first 3db bridge; an output end of the first 3db bridge is connected to the first end of the second -180° phase compensator; the other output end of the first 3db bridge is connected to the first end of the second -90° phase shifter; the second end of the second -180° phase compensator is connected to an input end of the second 3db bridge; one output end and the other output end of the second 3db bridge are respectively the sum signal output end of the broadband microstrip signal summator and the first a difference signal output terminal; the other input terminal of the second 3db bridge is connected to the second terminal of the fourth -90° phase shifter; the second terminal of the second -90° phase shifter is connected to an input terminal of the fourth 3db bridge; one output terminal of the fourth 3db bridge is the second difference signal output terminal of the broadband microstrip signal sum difference device, and the other output terminals are respectively the useless signal output terminals of the broadband microstrip signal sum difference device, which are connected to a matching load when in use; the other input terminal of the fourth 3db bridge is connected to the second terminal of the fourth -180° phase compensator; the second terminal of the third -90° phase shifter is connected to an input terminal of the third 3db bridge; The second end of the third -180° phase compensator is connected to the other input end of the third 3db bridge; an output end of the third 3db bridge is connected to the first end of the fourth -180° phase compensator; and the other output end of the third 3db bridge is connected to the first end of the fourth -90° phase shifter.

3. The broadband microstrip signal summator according to claim 1, characterized in that: The microstrip board includes a first microstrip board and a second microstrip board; the wiring surface of the first microstrip board is glued to the blank surface of the second microstrip board, and the respective copper-clad surfaces face the metal cavity shell; the wiring surface of the first microstrip board is the main wiring layer, and the first microstrip board and the second microstrip board are provided with through holes at positions corresponding to the input port and output port of the broadband microstrip signal summator.

4. The broadband microstrip signal summator according to claim 3, characterized in that: The broadband microstrip signal summator also includes a radio frequency connector; one radio frequency connector corresponds to one through hole.

5. The broadband microstrip signal summator according to claim 4, characterized in that: The RF connector is an ultra-small push-in RF coaxial connector; the input port and the output port of the broadband microstrip signal summator are welded to the corresponding conductors in the ultra-small push-in RF coaxial connector through the corresponding through holes on the first microstrip board and the through holes on the second microstrip board.

6. The broadband microstrip signal summator according to claim 4, characterized in that: The broadband microstrip signal summator also includes a metal cavity; the microstrip board is arranged inside the metal cavity; and the connection port of the radio frequency connector that is not connected to the microstrip board is exposed to the metal cavity.

7. The broadband microstrip signal summator according to claim 6, characterized in that: The center of the microstrip plate is fixed to an inner wall of one side of the metal cavity by screws.

8. The broadband microstrip signal summator according to claim 6, characterized in that: The height inside the metal cavity is consistent with the height of the microstrip board, and the outer height is the sum of the preset heights required for parts assembly.

9. The broadband microstrip signal summator according to claim 6, characterized in that: The metal cavity is made of aluminum; each network port and its lead in the main wiring surface of the first microstrip board in the broadband microstrip signal summator are 50 ohm impedance lines.

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