A multi-channel correction network

Abstract

The utility model belongs to the field of radio frequency multichannel correction network, and especially relates to a correction network of multichannel coupling. The utility model discloses a correction network casing, 8 T / R components end radio frequency connectors, 8 coupling end radio frequency connectors, an antenna end radio frequency connector, a load end radio frequency connector and load, a correction network cover, a coupling end cover, a load end cover and a coupler, the coupler is installed in the correction network casing, and the T / R components end radio frequency connector, coupling end radio frequency connector, antenna end radio frequency connector, load end radio frequency connector are all fixed on the correction network casing, the coupler is microstrip stripline and common ground coplanar waveguide form, and the 8 coupler antennas end and 8 coupler T / R ends are parallel arrangement. The utility model has the characteristics of simple processing, high consistency, small volume, easy installation, can reduce the complexity of feeder system, save space, and reduce the cost.

Description

Technical Field

[0001] This utility model belongs to the field of radio frequency multi-channel calibration networks, and specifically relates to a multi-channel coupled calibration network. Background Technology

[0002] In recent years, with the rapid development and application of civilian drones, drones have posed a significant threat to the security and confidentiality of border areas, airports, power plants, judicial institutions, important conferences, and sporting events. The problem of unauthorized drone flights has become increasingly serious, leading to a growing demand for drone detection. Radar can detect and sense targets in complex environments. Anti-drone radar is mainly used to detect small drone targets within a certain range. It provides information such as the distance, azimuth, altitude, and speed of drone targets through microwave detection, enabling the tracking and identification of drone targets.

[0003] Currently, most anti-drone radars adopt mechanically scanned one-dimensional phased array radars. Due to the high requirements for the detection accuracy of the system, the entire radar needs to perform amplitude and phase consistency correction on the transmitting and receiving channels. The antenna feeder and transceiver channel systems need to add correction functions. The antenna feeder subsystem needs to add a correction network to couple the transmitting and receiving signals of each channel to provide correction data for the system. At the same time, the correction network needs to have the characteristics of small size, low insertion loss, high consistency, and high cost performance. Therefore, a high-precision and cost-effective correction network is of great significance for improving the accuracy of the entire radar and for the application and promotion of the product.

[0004] Commonly used correction network forms include microstrip power splitting coupling and metal cavity coupling, such as the Chinese utility model patent "A Multi-channel Correction Network" (application number: CN202222795156.6). However, existing technologies have drawbacks such as poor consistency, high processing difficulty, and complex debugging, which increase the complexity and cost of the system to varying degrees. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-channel correction network. This invention employs a common-ground, coplanar waveguide configuration at the coupler input, load, antenna, and T / R terminals, allowing the internal stripline to be led out to the coupler surface via blind vias, facilitating soldering and making operation and debugging more convenient and efficient.

[0006] The technical solution of this utility model is: a multi-channel calibration network, including a calibration network housing, a T / R component-end RF connector, an antenna-end RF connector, a coupling-end RF connector, a load-end RF connector, a load, and a coupler; the coupler is installed inside the calibration network housing, and the T / R component-end RF connector, coupling-end RF connector, antenna-end RF connector, load-end RF connector, and load are fixed on the calibration network housing; characterized in that: the coupler width is 16mm, the length is 161mm, the coupler antenna end and the coupler T / R end are arranged in parallel, the distance between the two coupler antenna ends is 17mm, the coupler T / R end and the coupler antenna end adopt a common ground and coplanar waveguide form, the width of the microstrip line of the coupler T / R end is 1.7mm, the width of the first gap between the coupler T / R end microstrip line and the gold-plated copper layer on the front of the coupler is 0.3mm, the diameter of the blind hole of the coupler T / R end from the microstrip line to the internal stripline is 0.6mm, and the diameter of the first metal through hole on both sides of the coupler T / R end microstrip line is 0.6mm. The coupler antenna end microstrip line width is 1.7 mm; the width of the second gap between the coupler antenna end microstrip line and the gold-plated copper layer on the front side of the coupler is 0.3 mm; the diameter of the blind hole at the coupler antenna end where the coupler antenna end microstrip line turns into the internal stripline is 0.6 mm; the diameter of the second metal vias on both sides of the coupler antenna end microstrip line is 0.6 mm; the coupler coupling end and the coupler load end adopt a common ground coplanar waveguide form; the coupling end microstrip line width is 1.7 mm; the coupling end microstrip line and the coupler reverse side are gold-plated copper layered. The width of the third gap between layers is 0.15 mm, the diameter of the blind via of the coupling end from the microstrip line to the internal stripline is 0.6 mm, and the diameter of the metal vias on both sides of the coupling end microstrip line is 0.6 mm; the width of the load end microstrip line is 1.7 mm, the width of the fourth gap between the load end microstrip line and the gold-plated copper layer on the reverse side of the coupler is 0.15 mm, the diameter of the blind via of the load end microstrip line from the internal stripline to the load end is 0.6 mm, and the diameter of the metal vias on both sides of the load end microstrip line is 0.6 mm.

[0007] According to the multi-channel correction network described above, the coupler is connected to the T / R component end RF connector, the coupling end RF connector, the antenna end RF connector, the load end RF connector, and the load by soldering.

[0008] According to the multi-channel calibration network described above, the feature is that it further includes a calibration network cover plate; a coupling end cover plate and a load end cover plate, wherein the calibration network cover plate, the coupling end cover plate and the load end cover plate are fixed on the calibration network housing.

[0009] According to the multi-channel correction network described above, the feature is that the coupler is internally a microstrip line, and the T / R component end, antenna end, coupling end and load end adopt a common ground and coplanar waveguide form.

[0010] According to the multi-channel correction network described above, the coupler is characterized by being made of four layers of microstrip board laminated together, and the microstrip board is made of Rogers 4350 substrate.

[0011] According to the multi-channel correction network described above, the feature is that the coupler surface is processed by copper plating and gold plating.

[0012] The beneficial effects of this invention are as follows: By coupling the signal from the T / R terminal to the coupling terminal and controlling the coupling degree between the T / R terminal and the coupling terminal, the normal operation of the calibration channel can be guaranteed; by installing the coupler in the calibration housing and connecting it to the coupler through the RF connector, mode conversion and matching during microwave transmission can be completed, enabling the calibration network to operate within a wide bandwidth range; the calibration network is small in size, light in weight, compact in structure, and has low insertion loss, thus achieving compatibility between the calibration network and the radar calibration system. Attached Figure Description

[0013] Figure 1 To correct the overall network layout diagram.

[0014] Figure 2 This is a front view of the coupler.

[0015] Figure 3 This is a schematic diagram of the reverse side of the coupler.

[0016] Figure 4 for Figure 2 A partial schematic diagram.

[0017] Figure 5 for Figure 3 A partial schematic diagram.

[0018] Figure 6 for Figure 3 A partial schematic diagram.

[0019] Explanation of reference numerals in the attached figures: 1. Calibration network housing; 2. T / R component RF connector; 3. Coupler RF connector; 4. Antenna RF connector; 5. Load RF connector and load; 6. Calibration network cover plate; 7. Coupler cover plate; 8. Load cover plate; 10. Coupler T / R end; 101. Coupler antenna end; 102. Coupler coupling end; 103. Coupler load end; 104. Coupler T / R end microstrip line; 11. Coupler antenna end microstrip line; 12. First metal through-hole; 13. Second metal through-hole; 14. Coupler T / R end blind hole; 15. Coupler antenna end blind hole; 16. First slot; 17. Second slot; 18. Coupler end metal through-hole; 19. Load end metal through-hole; 20. Coupler front gold-plated copper layer; 21. Coupler back gold-plated copper layer; 33. Coupler end microstrip line; 31. Load end microstrip line; 32. Coupler end blind hole; 35. Load end blind hole; 36. Third slot; 37. Fourth slot; 38. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] The multi-channel correction network of this invention is applicable to the frequency band of 8GHz to 12GHz. For example... Figure 1 As shown, the multi-channel calibration network of this invention includes a calibration network housing 1; eight T / R component-end RF connectors 2; eight antenna-end RF connectors 4; one coupling-end RF connector 3; one load-end RF connector and load 5; a calibration network cover plate 6; one coupling-end cover plate 7; one load-end cover plate 8; and a coupler 10. The multi-channel calibration network coupler 10 is installed inside the calibration network housing 1. The T / R component-end RF connectors 2, 3, 4, 5, and 6 are all fixed to the calibration network housing 1. The calibration network cover plate 6, 7, and 8 are fixed to the calibration network housing. The calibration network cover plate 6 is fixed to the calibration network housing 1 with screws, forming a shielded cavity inside the housing to reduce the impact of external signals on the performance of the calibration network. The coupler 10 is connected to the T / R component-end RF connector 2, 3, 4, 5, and 6 by soldering.

[0022] like Figure 2As shown, the coupler 10 has a microstrip line internal structure. The T / R component end, antenna end, coupling end, and load end adopt a common-ground coplanar waveguide configuration. The signal at the T / R component end is transmitted via a common-ground coplanar waveguide-to-stripline transmission method, which reduces the transmission loss from the T / R component end to the antenna end. The microstrip line design results in a small, lightweight, and compact correction network with low insertion loss, achieving compatibility between the correction network and the radar correction system. The coupler 10 is made of four layers of microstrip board laminated together. The microstrip board uses Rogers 4350 material, which can effectively ensure the performance indicators of the coupler and the consistency of the indicators between channels. The coupler 10 is 16mm wide and 161mm long. The surface of the coupler is processed with copper plating and gold plating to shield the internal signals and ensure that the signals do not resonate during transmission. At the same time, the coupler 10 can form a good ground when installed in the correction housing 1. Eight coupler antenna ends 102 and eight coupler T / R ends 101 are arranged in parallel. The distance between two coupler antenna ends 102 is 17mm, which is consistent with the antenna spacing of the radar antenna subsystem and meets the antenna beam scanning angle requirements.

[0023] like Figure 2 As shown, in order to ensure that the RF connector installed on the calibration network housing 1 can be well installed and soldered with the coupler 10, the coupler T / R end 101 and the coupler antenna end 102 on the coupler 10 are both in the form of common ground and coplanar waveguides, leading the internal stripline to the front of the coupler and exposing the copper microstrip line on the surface for easy soldering. The width of the microstrip line 11 at the T / R end of the coupler is 1.7 mm. The width of the first gap 17 between the microstrip line 11 at the T / R end of the coupler and the gold-plated copper layer 21 on the front side of the coupler is 0.3 mm. The diameter of the blind hole 15 at the T / R end of the coupler, where the microstrip line 11 at the T / R end of the coupler turns into the inner stripline, is 0.6 mm. The diameter of the first metal through-hole 13 on both sides of the microstrip line 11 at the T / R end of the coupler is 0.6 mm. The width of the microstrip line 12 at the antenna end of the coupler is 1.7 mm. The width of the second gap 18 between the microstrip line 12 at the antenna end of the coupler and the gold-plated copper layer 21 on the front side of the coupler is 0.3 mm. The diameter of the blind hole 16 at the antenna end of the coupler, where the microstrip line 12 at the antenna end of the coupler turns into the inner stripline, is 0.6 mm. The diameter of the second metal through-hole 14 on both sides of the microstrip line 12 at the antenna end of the coupler is 0.6 mm.

[0024] like Figure 3As shown, both the coupling end 103 and the load end 104 of the coupler adopt the form of a common ground and coplanar waveguide, leading the internal coupling stripline of the coupler 10 to the opposite side of the coupler 10, exposing the copper-clad microstrip line on the surface for easy soldering. The coupling end microstrip line 31 has a width of 1.7 mm, the third gap 37 between the coupling end microstrip line 31 and the gold-plated copper layer 33 on the back of the coupler has a width of 0.15 mm, the diameter of the coupling end blind via 35 from the coupling end microstrip line 31 to the inner stripline has a diameter of 0.6 mm, and the diameter of the coupling end metal via 19 on both sides of the coupling end microstrip line 31 has a diameter of 0.6 mm; the load end microstrip line 32 has a width of 1.7 mm, the width of the fourth gap 38 between the load end microstrip line 32 and the gold-plated copper layer 33 on the back of the coupler has a width of 0.15 mm, the diameter of the load end blind via 36 from the load end microstrip line 32 to the inner stripline has a diameter of 0.6 mm, and the diameter of the load end metal via 20 on both sides of the load end microstrip line 32 has a diameter of 0.6 mm.

[0025] This invention controls the coupling degree between the signal coupling terminal 101 and the coupler coupling terminal 103 via the signal coupling terminal 101 of the T / R component, thus ensuring the normal operation of the calibration channel. By adjusting the linewidth of some microstrip lines in the main channel and the coupling channel, as well as the slot width of the coplanar waveguide, impedance transformation and standing wave matching are achieved. Simultaneously, the reverse coupling coefficient is reduced, minimizing the influence of external signals on the calibration signal. By mounting the coupler in the calibration housing and connecting it via an RF connector, mode conversion and matching during microwave transmission can be completed, enabling the calibration network to operate over a wide bandwidth. The design of the first slot 17, second slot 18, third slot 37, fourth slot 38, and the blind and through vias ensures good fabrication consistency in the calibration network, facilitating operation and debugging, and resulting in stable final product performance.

Claims

1. A multi-channel calibration network, comprising a calibration network housing, a T / R component-end RF connector, an antenna-end RF connector, a coupling-end RF connector, a load-end RF connector, a load, and a coupler; the coupler is installed inside the calibration network housing, and the T / R component-end RF connector, the coupling-end RF connector, the antenna-end RF connector, the load-end RF connector, and the load are fixed on the calibration network housing; characterized in that: The coupler antenna end and coupler T / R end are arranged in parallel, with a spacing of 17mm between the two coupler antenna ends. The coupler T / R end and coupler antenna end adopt a common ground and coplanar waveguide configuration. The width of the microstrip line at the coupler T / R end is 1.7mm. The width of the first gap between the microstrip line at the coupler T / R end and the gold-plated copper layer on the front of the coupler is 0.3mm. The diameter of the blind aperture at the coupler T / R end where the microstrip line turns into the internal stripline is 0.6mm. The diameter of the first metal vias on both sides of the microstrip line at the coupler T / R end is 0.6mm. The width of the microstrip line at the coupler antenna end is 1.7mm. The width of the second gap between the microstrip line at the coupler antenna end and the gold-plated copper layer on the front of the coupler is 0.3mm. The diameter of the blind aperture at the coupler antenna end where the microstrip line turns into the internal stripline is 0.6mm. The diameter of the second metal via on both sides of the microstrip line at the antenna end of the coupler is 0.6 mm; the coupling end and the load end of the coupler adopt a common ground and coplanar waveguide form; the width of the microstrip line at the coupling end is 1.7 mm; the width of the third gap between the microstrip line at the coupling end and the gold-plated copper layer on the back of the coupler is 0.15 mm; the diameter of the blind via at the coupling end where the microstrip line turns into the inner stripline is 0.6 mm; the diameter of the metal via on both sides of the microstrip line at the coupling end is 0.6 mm; the width of the microstrip line at the load end is 1.7 mm; the width of the fourth gap between the microstrip line at the load end and the gold-plated copper layer on the back of the coupler is 0.15 mm; the diameter of the blind via at the load end where the microstrip line turns into the inner stripline is 0.6 mm; the diameter of the metal via on both sides of the microstrip line at the load end is 0.6 mm.

2. The multi-channel correction network according to claim 1, characterized in that: The coupler is connected to the T / R component RF connector, the coupling end RF connector, the antenna end RF connector, the load end RF connector, and the load by soldering.

3. The multi-channel correction network according to claim 1, characterized in that: It also includes a calibration network cover plate; a coupling end cover plate and a load end cover plate, which are fixed to the calibration network housing.

4. The multi-channel correction network according to claim 1, characterized in that: The coupler is internally a microstrip line, and the T / R component end, antenna end, coupling end and load end adopt a common ground coplanar waveguide form.

5. A multi-channel calibration network according to any one of claims 1 to 4, characterized in that: The coupler is made of four layers of microstrip board laminated together, and the microstrip board is made of Rogers 4350 material.

6. A multi-channel calibration network according to any one of claims 1 to 4, characterized in that: The coupler surface is processed using a copper plating and gold plating process.

7. A multi-channel calibration network according to any one of claims 1 to 4, characterized in that: The coupler is 16mm wide and 161mm long.

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