A passive radio frequency lightning suppressor

Abstract

The application provides a passive radio frequency lightning suppressor, and relates to the technical field of lightning protection equipment. It comprises a metal shell, a PCB board, an SMA connector, a jumper, a capacitor, an inductor and a metal cover plate. The PCB board is connected in the interior of the metal shell. The PCB board is provided with a microstrip line. The two ends of the jumper and the two ends of the capacitor are connected with the microstrip line. The two ends of the inductor are respectively connected with the microstrip line and the grounding wire of the PCB board. The two ends of the metal shell in the length direction are respectively connected with an SMA connector to form an input end and an output end. The lightning suppression performance of the passive radio frequency lightning suppressor is excellent, which can realize good protection for the rear-end radio frequency circuit. The radio frequency characteristic is excellent, which can realize the requirements of low standing wave and low insertion loss, and can realize the requirement of low phase noise. In addition, the passive radio frequency lightning suppressor can meet the requirements of severe environment, has the characteristics of light weight and small size, has high reliability, and can prolong the service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of lightning protection equipment technology, and in particular to a passive radio frequency lightning suppressor. Background Technology

[0002] Lightning is one of the most serious natural disasters. The voltage of lightning can reach millions or even tens of millions of volts, and the current can reach hundreds of thousands of amperes, inevitably damaging electronic equipment. At the same time, lightning is also a common natural discharge phenomenon. If an aircraft is struck by lightning during flight, it will interfere with its electronic and electrical systems, and in severe cases, affect flight safety. Airborne radar and communication systems, in particular, are facing increasingly stringent requirements for lightning protection, in addition to their own communication capabilities.

[0003] Currently, the most common protection solution is to add protective devices with suppression effects at the front end of the system. Lightning suppressors are one of the commonly used lightning protection methods in radar signal paths. They can effectively suppress the surge voltage generated by lightning waves and effectively protect downstream circuits. Common types include gas discharge tube type, TVS tube type, and 1 / 4 wavelength wire type suppression products.

[0004] The applicant has discovered at least the following technical problems in the existing technology: Currently, the commonly used types of lightning suppressors are mainly gas discharge tube type, TVS tube type, and quarter-wavelength conductor type. Gas discharge tube type suppressors have the advantages of high insulation resistance, low parasitic capacitance, and low communication noise interference, but due to their long gas discharge time, their sensitivity is not high, and the gas discharge tube type cannot meet the application requirements. TVS tube type suppressors have the advantages of high sensitivity, low leakage current, and low residual voltage, but their junction capacitance is relatively large, resulting in greater communication interference. A simple quarter-wavelength lightning suppressor has a fast response time, high sensitivity, good lightning wave suppression performance, and is easy to adjust the operating frequency band. However, currently, general quarter-wavelength transmission directly uses microstrip lines, which is difficult to implement for products with stringent phase noise requirements. Considering the performance requirements of airborne equipment, the low sensitivity of gas discharge tubes, the high standing wave phase of transient suppression TVS tubes, and the single quarter-wavelength conductor type cannot meet the wide bandwidth requirements of customers. Summary of the Invention

[0005] The purpose of this invention is to provide a passive radio frequency lightning suppressor to solve the technical problems existing in the prior art. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A passive radio frequency lightning suppressor includes a metal housing, a PCB board, an SMA connector, jumpers, capacitors, inductors, and a metal cover. The PCB board is connected inside the metal housing and has a microstrip line. Both ends of the jumpers and the capacitors are connected to the microstrip line. Both ends of the inductor are connected to the microstrip line and the ground wire of the PCB board, respectively. Each end of the metal housing along its length is connected to an SMA connector to form an input terminal and an output terminal. The metal cover is connected to the top of the metal housing.

[0008] Preferably, the inductor is divided into two continuous sections along its length and forms an L-shaped connection.

[0009] Preferably, the inductor is hollow-wound.

[0010] Preferably, the microstrip line is divided into a first sub-segment, a second sub-segment, and a third sub-segment along its length. The two ends of the jumper are connected to the first sub-segment and the second sub-segment, respectively. The two ends of the capacitor are connected to the second sub-segment and the third sub-segment, respectively. The two ends of the inductor are connected to the first sub-segment and the ground wire of the PCB board, respectively.

[0011] Preferably, the outer conductor of the SMA connector is fixedly connected to the metal housing, and the inner conductor of the SMA connector is fixedly connected to the microstrip line.

[0012] Preferably, the back side of the PCB board is in contact with the bottom surface of the metal casing.

[0013] Preferably, the metal housing is provided with a fixing part, and the metal housing is connected to the external structure through the fixing part.

[0014] Preferably, the metal housing has a plurality of fixed platforms inside, and the outer edge of the PCB board is fixedly connected to the outer surface of the plurality of fixed platforms and the inner wall of the metal housing.

[0015] Preferably, the main body of the inductor is fixed to the PCB board by adhesive dispensing.

[0016] Preferably, both the outer surface of the metal housing and the outer surface of the metal cover are provided with a surface paint layer.

[0017] The beneficial effects of this invention are: 1. Excellent lightning suppression performance, able to meet low residual voltage requirements, and able to provide good protection for back-end radio frequency circuits;

[0018] 2. Excellent radio frequency characteristics, enabling it to meet the requirements of low VSWR, low insertion loss, and low phase noise;

[0019] 3. Meets the requirements of harsh environments and can achieve good electromagnetic shielding effect;

[0020] 4. Lightweight and compact design, meeting the requirements for light weight and small size for airborne applications;

[0021] 5. High reliability: The passive design, optimal matching design, and reflection and discharge design make the internal components less prone to aging and can meet the long service life of airborne equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a top view of the structure of the present invention with the metal cover plate concealed.

[0024] Figure 2 This is a top view of the structure of the present invention;

[0025] Figure 3 This is an enlarged view of the structure of the present invention with the metal cover plate concealed.

[0026] Figure 4 This is a side view of the present invention;

[0027] In the figure: 1. Metal casing; 11. Fixing part; 12. Fixing platform;

[0028] 2. PCB board; 21. First sub-segment; 22. Second sub-segment; 23. Third sub-segment;

[0029] 3. SMA connector; 4. Jumper wire; 5. Capacitor; 6. Inductor; 7. Metal cover plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Reference Figures 1 to 4 This invention discloses a passive radio frequency lightning suppressor, comprising a metal housing 1, a PCB board 2, an SMA connector 3, a jumper 4, a capacitor 5, an inductor 6, and a metal cover plate 7. The PCB board 2 is connected inside the metal housing 1, and a microstrip line is provided on the PCB board 2. Both ends of the jumper 4 and both ends of the capacitor 5 are connected to the microstrip line, and both ends of the inductor 6 are connected to the microstrip line and the ground line of the PCB board 2, respectively.

[0034] In this embodiment, the microstrip line is preferably divided into three segments along its length, namely, the first sub-segment 21, the second sub-segment 22, and the third sub-segment 23. The two ends of the jumper 4 are connected to the first sub-segment 21 and the second sub-segment 22, respectively. The two ends of the capacitor 5 are connected to the second sub-segment 22 and the third sub-segment 23, respectively. The two ends of the inductor 6 are connected to the first sub-segment 21 and the ground wire of the PCB board 2, respectively.

[0035] By using jumper 4 and changing the width of its U-shaped port, the performance errors and phase noise caused by device tolerances and parasitic parameters can be resolved, reducing process difficulty and device error levels, improving product consistency, and preserving the flexibility of RF parameter adjustment. The requirements for low loss and low VSWR in the RF path can be met by adjusting jumper 4.

[0036] Inductor 6 can discharge lightning surge signals, ensuring that the residual voltage and residual current at the output are suppressed to a small range.

[0037] The metal housing 1 has two ends along its length connected to an SMA connector 3, forming an input and an output end. The SMA connector 3 has different connector structures for the corresponding input and output ends. This embodiment is illustrated in the appendix. Figure 1 In the diagram, the leftmost terminal is the input terminal, and the rightmost terminal is the output terminal.

[0038] After all the above structures are connected, the metal cover plate 7 is connected to the top of the metal shell 1. The connection here is preferably welded to form a fully sealed structure, which achieves a good electromagnetic shielding effect and meets the usage requirements under harsh environmental conditions.

[0039] The passive RF lightning suppressor adopts a reflection and discharge design technology. The product is designed to have a suppression capability of about 40dB at a frequency of 1MHz, exhibiting low impedance characteristics, which effectively reduces the impact of lightning signals on back-end devices.

[0040] Passive RF lightning suppressors have excellent lightning suppression performance. When struck by lightning, the device can quickly reduce the impedance between the signal path and ground to conduct, thereby ensuring that the downstream circuit components are protected from damage by transient, high-energy interference. It provides good protection for the downstream RF circuit. In addition, it has good tolerance and performs well after multiple lightning tests.

[0041] Passive radio frequency lightning suppressors have radio frequency functionality, which can ensure high-fidelity transmission of radio frequency signals within the specified operating frequency range. Through circuit and transmission line matching design, low loss, low standing wave ratio, low phase noise, and high phase consistency requirements are achieved.

[0042] Passive radio frequency lightning suppressors have good compatibility. While ensuring functional performance, they are designed to be compatible with the environmental adaptability, small size and lightweight requirements of airborne equipment, and meet the high reliability requirements of the products.

[0043] Passive radio frequency lightning suppressors are highly reliable. They employ a passive design, optimal matching design, and a reflection and discharge design, which makes the internal components less prone to aging and can meet the long service life requirements of airborne equipment.

[0044] As an alternative implementation, the inductor 6 is divided into two continuous sections along its length and forms an L-shaped connection shape, and is hollowly wound, which can save internal space to the greatest extent and reduce weight.

[0045] By adopting a double-section inductor 6, the simple 1 / 4 wavelength short-wire design was replaced, achieving lightning protection capability in the lower frequency band.

[0046] Meanwhile, the L-shaped double-joint inductor is easier to change the bending angle. By adjusting the bending angle of the L-shaped double-joint inductor and changing the jumper width, the index error and phase noise caused by device tolerance and parasitic parameters can be solved, reducing the process difficulty and device error level, and improving product consistency.

[0047] It is worth noting that this embodiment also adopts an integrated design, which allows the inductance value to be adjusted simply by changing the number of turns of the L-shaped double-section inductor, thereby adjusting the frequency range.

[0048] The two ends of the inductor 6 are connected to the microstrip line and the ground line of the PCB board 2, respectively. The main body of the inductor 6 is preferably fixed to the PCB board 2 by dispensing glue, so that the main body of the inductor 6 is also fixed to a certain extent to meet the usage requirements of the inductor 6.

[0049] As an optional implementation, the outer conductor of the SMA connector 3 is directly connected to the metal housing 1, and after direct installation, a fixing method mainly based on welding is used to achieve a seamless connection between the outer conductor and the metal housing 1.

[0050] The inner conductor of the SMA connector 3 is fixedly connected to the microstrip line. The fixed connection is preferably soldered. The input SMA connector 3 is connected to the first sub-segment 21, and the output SMA connector 3 is connected to the third sub-segment 23.

[0051] By adopting the connection method of external direct connection and internal cavity welding of SMA connector 3, the external conductors of both the input and output ends are grounded with the structure in a two-level manner, which realizes electrical continuity in the structural connection and also ensures reliable connection, ensuring that the lightning signal is in a low impedance state to ground.

[0052] In addition, the interior of the metal housing 1 is silver-plated, which enables good welding after the metal housing 1 is connected to the SMA outer conductor. It also effectively avoids excessive mechanical stress on the electrical connection parts of the SMA connector 3, thereby strengthening the connection of the SMA and improving the high reliability of the connection.

[0053] As an optional implementation, a fixing part 11 is provided on the metal housing 1. The metal housing 1 is connected to the external structure through the fixing part 11. The fixing part 11 preferably has a plurality of mounting holes for fixing to the external structure. This allows the passive radio frequency lightning suppressor mentioned in this embodiment to not only be used independently, but also to be made into the built-in structure of other external structures, thus enriching the application scenarios of the device.

[0054] As an optional implementation, the metal housing 1 is provided with a number of fixing platforms 12. Compared with the relatively thick bottom structure in the prior art, the bottom of the metal housing 1 in this embodiment can be hollowed out to accommodate the PCB board 2, thereby reducing weight and saving internal space to the greatest extent. The outer edge of the PCB board 2 can be fixedly connected to the outer surface of the number of fixing platforms 12 and the inner wall of the metal housing 1 at the same time. The fixing connection is preferably glued to make it firm.

[0055] As an optional implementation, in order to ensure high consistency of characteristic parameters, the circuit connection lines of PCB board 2 are used as microstrip lines to connect the input port and the output port. The back of PCB board 2 should be grounded as much as possible. Grounding means that the back of PCB board 2 is in contact with the bottom surface of metal housing 1. At the same time, ground vias need to be arranged reasonably to minimize the ground impedance.

[0056] In addition, the fixed stage 12, PCB board 2 and SMA connector 3 can simultaneously take into account the process operation space and integrated cooperation, ensuring maximum cooperation and operability.

[0057] As an optional implementation, both the outer surface of the metal housing 1 and the outer surface of the metal cover 7 are provided with a surface paint layer to achieve a protective coating treatment on the surface, so as to cope with the characteristics of the large temperature variation range and strong vibration and impact of the suppressor's operating environment. At the same time, it can meet the special environmental requirements such as low air pressure, salt spray, and high humidity, and meet the usage requirements under harsh environmental conditions.

[0058] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A passive radio frequency lightning suppressor, characterized in that, The device includes a metal housing (1), a PCB board (2), an SMA connector (3), a jumper (4), a capacitor (5), an inductor (6), and a metal cover plate (7). The PCB board (2) is connected inside the metal housing (1). A microstrip line is provided on the PCB board (2). Both ends of the jumper (4) and both ends of the capacitor (5) are connected to the microstrip line. Both ends of the inductor (6) are connected to the microstrip line and the ground line of the PCB board (2), respectively. Both ends of the metal housing (1) in the length direction are connected to an SMA connector (3) to form an input terminal and an output terminal. The metal cover plate (7) is connected to the top of the metal housing (1). The inductor (6) is divided into two continuous sections along its length and forms an L-shaped connection. The microstrip line is divided into a first sub-segment (21), a second sub-segment (22), and a third sub-segment (23) along its length. The two ends of the jumper (4) are connected to the first sub-segment (21) and the second sub-segment (22) respectively. The two ends of the capacitor (5) are connected to the second sub-segment (22) and the third sub-segment (23) respectively. The two ends of the inductor (6) are connected to the first sub-segment (21) and the ground wire of the PCB board (2) respectively. The inductor (6) is hollow-wound.

2. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The outer conductor of the SMA connector (3) is fixedly connected to the metal housing (1), and the inner conductor of the SMA connector (3) is fixedly connected to the microstrip line.

3. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The back side of the PCB board (2) is in contact with the bottom surface of the metal housing (1).

4. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The metal housing (1) is provided with a fixing part (11), and the metal housing (1) is connected to the external structure through the fixing part (11).

5. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The metal housing (1) has several fixed platforms (12) inside, and the outer edge of the PCB board (2) is fixedly connected to the outer surface of the several fixed platforms (12) and the inner wall of the metal housing (1).

6. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The main body of the inductor (6) is fixed to the PCB board (2) by dispensing glue.

7. The passive radio frequency lightning suppressor according to claim 1, characterized in that: The outer surface of the metal shell (1) and the outer surface of the metal cover plate (7) are both provided with a surface paint layer.

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