An electromagnetic pulse protection circuit, a constant impedance radio frequency circuit and an implementation method thereof

Abstract

The present application relates to the field of electromagnetic interference protection, and in particular to an electromagnetic pulse protection circuit, a constant impedance radio frequency circuit and an implementation method thereof; the constant impedance radio frequency circuit mainly includes an outer metal cavity, an inner metal cavity, a radio frequency input conductor and a radio frequency output conductor; the present solution utilizes metal mechanical structural parts, breaks through the conventional form, realizes the performance and function of electronic components and the electrical connection between circuits, avoids the use of conventional electronic components to realize circuit and circuit board welding assembly, improves the circuit structure reliability, and effectively saves the electromagnetic pulse protection cost of the equipment.

Description

Technical Field

[0001] The present application relates to the field of electromagnetic interference protection, and in particular to an electromagnetic pulse protection circuit, a constant impedance radio frequency circuit and an implementation method thereof. Background Art

[0002] As various wireless equipment and facilities are widely used in industrial and agricultural production, scientific research, outer space exploration, national defense construction, homeland security defense and other engineering fields, various wireless transceiver systems are placed in a complex electromagnetic environment. Wireless transceiver system equipment, especially antennas and coaxial feeders, are exposed outside the equipment and are easily invaded by various transient electromagnetic pulses in the complex electromagnetic environment. Various transient electromagnetic pulses are introduced into the wireless transceiver system through antennas and feeders, which may cause damage to key sensitive equipment in the system, thereby affecting the normal operation of the wireless transceiver system.

[0003] Currently in the field of electromagnetic pulse protection, the technology for protection against slow-edge strong electromagnetic pulses (such as lightning electromagnetic pulses) is relatively mature, while the protection technology for other types of fast-edge strong electromagnetic pulses (such as nuclear power electromagnetic pulses and high-power microwave pulses) is still in its infancy. How to implement effective strong electromagnetic pulse comprehensive protection for radio frequency (RF) transceiver links in a way that effectively saves the electromagnetic pulse protection cost of equipment and improves the protection performance of the equipment itself is a technical problem that urgently needs to be solved in the current RF link strong transient electromagnetic pulse protection. Summary of the invention

[0004] In order to improve the protection performance of the wireless transceiver system equipment against strong battery pulses while effectively saving the electromagnetic pulse protection cost of the equipment, the present application provides an electromagnetic pulse protection circuit, a constant impedance radio frequency circuit and an implementation method thereof.

[0005] In a first aspect, the present application provides a method for realizing a constant impedance radio frequency circuit for electromagnetic pulse protection, comprising: placing an outer metal cavity 17 on an installation station, and fixing a metal end cover 15A having an insulating dielectric plate 14A attached to an inner surface thereof on one of the openings of the outer metal cavity 17 to seal the opening; a through hole is provided in the middle of the metal end cover 15A; and a through hole is provided on the insulating dielectric plate 14A, which is opposite to the through hole of the metal end cover 15A;

[0006] Through another opening of the outer metal cavity 17, the output end of the electromagnetic pulse suppression device 23 is mounted on the output interface provided on the inner surface of the outer metal cavity 17 to achieve electrical connection between the electromagnetic pulse suppression device 23 and the outer metal cavity 17;

[0007] The inner metal cavity 18 is placed into the outer metal cavity 17 through another opening of the outer metal cavity 17, and the input end of the electromagnetic pulse suppression device 23 is connected to the input interface set on the outer surface of the inner metal cavity 18 to achieve electrical connection between the inner metal cavity 18 and the electromagnetic pulse suppression device 23, and to achieve positioning of the inner metal cavity 18 inside the outer metal cavity 17; one of the openings of the inner metal cavity 18 is sealed in advance by an inductive metal structure 13A, and the inductive metal structure 13A is in contact with the insulating dielectric plate 14A; the inductive metal structure 13A is provided with a through hole corresponding to the through hole position of the insulating dielectric plate 14A; the RF input conductor 11A is placed into the inner metal cavity through another opening of the outer metal cavity 17 and another opening of the inner metal cavity 18 18; and the input end of the RF input conductor 11A is inserted into the through hole of the inductive metal structure 13A, and sequentially passes through the through hole of the insulating dielectric plate 14A and the through hole of the metal end cover 15A, and extends to the outside of the outer metal cavity 17; the contact surface between the RF input conductor 11A and the metal end cover 15A is provided with an insulating layer to ensure that there is no electrical connection between the RF input conductor 11A and the metal end cover 15A; the contact surface between the RF input conductor 11A and the inductive metal structure 13A is exposed to ensure that the RF input conductor 11A is directly electrically connected to the inductive metal structure 13A; at one end of the RF input conductor 11A, a planar metal structure 12A is electrically connected; and an insulating dielectric material layer 16 is bonded to the end of the planar metal structure 12A away from the RF input conductor 11A;

[0008] A planar metal structure 12B is electrically connected to one end of the RF output conductor 11B; and an adhesive is applied to one end of the planar metal structure 12B away from the RF input conductor 11B;

[0009] Align and bond one end coated with the adhesive to the insulating dielectric material layer 16 to fix the RF output conductor 11B;

[0010] The through hole in the middle of the inductive metal structure 13B is aligned with the RF output conductor 11B, and the inductive metal structure 13B is sleeved on the RF output conductor 11B, and is installed and fixed to another opening of the inner metal cavity 18 to achieve sealing of the opening; the contact surface between the RF output conductor 11B and the inductive metal structure 13B is exposed to ensure that the RF output conductor 11B is directly electrically connected to the inductive metal structure 13B;

[0011] The through hole opened in the middle of the metal end cover 15B is aligned with the RF output conductor 11B, and is sleeved on the RF output conductor 11B, and is installed and fixed to another opening of the outer metal cavity 17 to achieve sealing of the opening; the contact surface between the RF output conductor 11B and the metal end cover 15B is provided with an insulating layer to ensure that there is no electrical connection between the RF output conductor 11B and the metal end cover 15B; the output end of the RF output conductor 11B is located outside the outer metal cavity 17.

[0012] Optionally, one end of the RF input conductor 11A away from the planar metal structure 12A is connected to a RF input port for transmitting an external RF signal;

[0013] One end of the RF output conductor 11B away from the planar metal structure 12B is connected to the RF output port for outputting the RF output signal after protection processing.

[0014] In a second aspect, the present application provides a constant impedance radio frequency circuit for electromagnetic pulse protection, comprising:

[0015] An outer metal cavity 17, wherein the outer metal cavity 17 is provided with two first openings at opposite positions, wherein the first opening on one side is sealed by a metal end cover 15A, and wherein the first opening on the other side is sealed by a metal end cover 15B;

[0016] An inner metal cavity 18, wherein the inner metal cavity 18 is disposed inside the outer metal cavity 17 and has no physical contact with the inner surface of the outer metal cavity 17; the inner metal cavity 18 is provided with two second openings at opposite positions, wherein the second opening on one side is sealed by the inductive metal structural member 13A, and the second opening on the other side is sealed by the metal end cover 13B;

[0017] The RF input conductor 11A is used to transmit the RF input signal. The RF input conductor 11A passes through the metal end cover 15A and the inductive metal structure 13A and extends into the inner metal cavity 18. There is no electrical connection between the RF input conductor 11A and the metal end cover 15A, and the RF input conductor 11A is directly electrically connected to the inductive metal structure 13A. The RF input conductor 11A is located at one end in the inner metal cavity 18 and is electrically connected to a planar metal structure 12A.

[0018] The RF output conductor 11B passes through the metal end cover 15B and the inductive metal structure 13B, and extends into the inner metal cavity 18; there is no electrical connection between the RF output conductor 11B and the metal end cover 15B, and the RF output conductor 11B is directly electrically connected to the inductive metal structure 13B; and the RF output conductor 11B is located at one end in the inner metal cavity 18, and is electrically connected to a planar metal structure 12B; the planar metal structure 12B is opposite to the planar metal structure 12A, and there is no physical contact between the two.

[0019] Optionally, one end of the RF input conductor 11A away from the planar metal structure 12A is connected to a RF input port for transmitting an external RF signal;

[0020] One end of the RF output conductor 11B away from the planar metal structure 12B is connected to a RF output port for outputting a RF output signal after protection processing.

[0021] Optionally, the RF input port is a 50-ohm transmission line input port, and the RF output port is a 50-ohm transmission line output port.

[0022] Optionally, an insulating dielectric plate 14 is provided between the outer metal cavity 17 and the inner metal cavity 18;

[0023] A non-metallic insulating medium 16 is filled between the planar metal structure 12B and the planar metal structure 12A.

[0024] Optionally, a first waterproof groove is provided at the contact end surface between the outer metal cavity 17 and the metal end cover 15; the metal end cover 15 includes the metal end cover 15A and / or the metal end cover 15B;

[0025] A first conductive rubber 21 of matching shape and size is disposed in the first waterproof groove.

[0026] Optionally, a second waterproof groove is provided at the contact end surface between the metal end cover 15 and the RF input port; a second conductive rubber 22 of matching shape and size is provided in the second waterproof groove.

[0027] In a third aspect, the present application provides an electromagnetic pulse protection circuit, comprising a constant impedance radio frequency circuit as described in any of the above items, and also comprising an electromagnetic pulse suppression device 23, wherein the electromagnetic pulse suppression device 23 is electrically connected between the outer metal cavity 17 and the inner metal cavity 18.

[0028] In summary, this application at least includes the following beneficial technical effects:

[0029] 1. The present invention is based on engineering practice and uses metal mechanical structural parts to realize the principle of constant impedance radio frequency circuit. It can solve the constant impedance technical problems of comprehensive protection against various types of strong transient electromagnetic pulses, and can also guide engineering practice to realize comprehensive protection devices, and can meet relevant technical standards. It can also be verified through relevant tests and experiments, and can solve the strong transient electromagnetic pulse comprehensive protection technical problems of key equipment on the radio frequency link; at the same time, the use of metal mechanical structural parts breaks through the conventional form, realizes the performance and function of electronic components and the electrical connection between circuits, avoids the use of conventional electronic components to realize circuit and circuit board welding assembly, improves the reliability of the circuit structure, and effectively saves the electromagnetic pulse protection cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a constant impedance radio frequency circuit structure for electromagnetic pulse protection in an embodiment of the present application;

[0031] Figure 2A This is a schematic diagram of the three-dimensional structure of a constant impedance radio frequency circuit packaging product for electromagnetic pulse protection in an embodiment of the present application;

[0032] Figure 2B This is a schematic diagram of the three-dimensional structure of another constant impedance radio frequency circuit packaging product for electromagnetic pulse protection in an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of an equivalent circuit structure for electromagnetic pulse protection in an embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of a partial enlarged structure of a constant impedance radio frequency circuit for electromagnetic pulse protection in an embodiment of the present application;

[0035] Figure 5 This is a schematic diagram of another constant impedance radio frequency circuit structure for electromagnetic pulse protection in an embodiment of the present application;

[0036] Figure 6 This is a schematic diagram of the structure of an electromagnetic pulse protection circuit in an embodiment of the present application;

[0037] Figure 7 The present invention is a flowchart of a method for implementing a constant impedance radio frequency circuit for electromagnetic pulse protection in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 11A-RF input conductor; 11B-RF output conductor; 12A-planar metal structure; 12B-planar metal structure; 13A-inductive metal structure; 13B-inductive metal structure; 14A-insulating dielectric plate; 14B-insulating dielectric plate; 15A-metal end cap; 15B-metal end cap; 16-insulating dielectric material layer; 17-outer metal cavity; 18-inner metal cavity; 19A-one electrode of inductor L1 (not shown); 20A-the other electrode of inductor L1 (not shown); 19B-one electrode of inductor L2; 20B-the other electrode of inductor L2; 21-first conductive rubber; 22-second conductive rubber; 23-electromagnetic pulse suppression device. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear contrary indication in its context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items. The term "exemplary" means "used as an example, embodiment or illustrative", and any embodiment described as "exemplary" here does not need to be interpreted as being superior to or better than other embodiments. The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as implying or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can expressly or implicitly include one or more of these features, and in the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0042] An embodiment of the present application provides a constant impedance radio frequency circuit for electromagnetic pulse protection.

[0043] refer to Figure 1 , a constant impedance radio frequency circuit for electromagnetic pulse protection, Figure 1 This is a cross-sectional view of the product after the constant impedance RF circuit is packaged. For easy understanding, please refer to the following Figure 2A or Figure 2B The product three-dimensional schematic diagram shown is mainly composed of an outer metal cavity 17 and an inner metal cavity 18: the metal cavity can be in the shape of a cube, an elliptical column, a cylinder, etc.; a cylinder is preferred.

[0044] The outer metal cavity 17 is provided with two first openings at opposite positions (two opposite sides), one of which is sealed by a metal end cap 15A, and the other is sealed by a metal end cap 15B. The metal end cap 15 can be sealed and fixed with the outer metal cavity 17 by means of flange fixing, extrusion tight fit crimping or thread fitting process, and the metal end cap 15 is in direct physical contact with the outer metal cavity 17 to achieve electrical connection.

[0045] The inner metal cavity 18 is disposed inside the outer metal cavity 17 and has no physical contact with the inner surface of the outer metal cavity 17. The inner metal cavity 18 is provided with two second openings opposite to each other, one of which is sealed by the inductive metal structure 13A, and the other is sealed by the metal end cover 13B.

[0046] The RF input conductor 11A is used to transmit the RF input signal. The RF input conductor 11A passes through the metal end cover 15A and the inductive metal structure 13A and extends into the inner metal cavity 18. There is no electrical connection between the RF input conductor 11A and the metal end cover 15A. The RF input conductor 11A is directly electrically connected to the inductive metal structure 13A. The RF input conductor 11A is located at one end in the inner metal cavity 18 and is electrically connected to a planar metal structure 12A.

[0047] The RF output conductor 11B passes through the metal end cap 15B and the inductive metal structure 13B, and extends into the inner metal cavity 18; there is no electrical connection between the RF output conductor 11B and the metal end cap 15B, and the RF output conductor 11B is directly electrically connected to the inductive metal structure 13B; and one end of the RF output conductor 11B located in the inner metal cavity 18 is electrically connected to a planar metal structure 12B. The planar metal structure 12B is opposite to the planar metal structure 12A, and there is no physical contact between the two.

[0048] In an optional embodiment of the present application, the end of the RF input conductor 11A away from the planar metal structure 12A is connected to a RF input port for transmitting external RF signals; specifically, the RF input port can be a 50-ohm transmission line input port. The end of the RF output conductor 11B away from the planar metal structure 12B is connected to a RF output port for outputting the RF output signal after protection treatment; specifically, the RF output port can be a 50-ohm transmission line output port.

[0049] Through the 50 ohm transmission line input port and 50 ohm transmission line output port, it can be easily connected to various RF connectors.

[0050] In the embodiment of the present application, the RF input conductor 11A and the RF output conductor 11B can be selected as 50 ohm RF transmission lines, and the planar metal structural members 12A and 12B arranged opposite to each other at their end faces constitute the RF coupling capacitor C3. Figure 3 Specifically, one end of the RF input conductor 11A is connected to the planar metal structure 12A to form an electrode of the RF coupling capacitor C3, and one end of the RF output conductor 11B is connected to the planar metal structure 12B to form the other electrode of the capacitor C3. An insulating dielectric material layer 16 is filled between the two electrodes (i.e., between 12A / 12B) to form the physical structure of the RF coupling capacitor C3.

[0051] In an optional embodiment of the present application, the planar metal structural members 12A and 12B have the same shape, size, and material, and are parallel to each other.

[0052] In the embodiment of the present application, the outer metal cavity 17 is physically isolated from the inner metal cavity 18, and is filled with air or provided with an insulating dielectric plate 14 to form the physical structure of the resonant capacitors C1 and C2. Specifically, an insulating dielectric plate 14A is provided between the metal end cap 15A and the inductive metal structural member 13A, and an insulating dielectric plate 14B is provided between the metal end cap 15B and the inductive metal structural member 13B; the outer metal cavity 17 is connected to the metal end caps 15A and 15B to form a metal integrated sealing structure, the metal end cap 15A constitutes a metal plane at one end of the resonant capacitor C1 (not shown), and the inductive metal structural member 13A constitutes a metal plane at the other end of the resonant capacitor C1 (not shown); the metal end cap 15B constitutes a metal plane 15C at one end of the resonant capacitor C2, and the inductive metal structural member 13B constitutes a metal plane 13C at the other end of the resonant capacitor C2, refer to Figure 4 shown.

[0053] In the embodiment of the present application, the RF input conductor 11A and the RF output conductor 11B, the inductive metal structures 13A and 13B, constitute the RF resonant inductor L1 / L2. The RF resonant inductor L1 includes two electrodes, 19A (not shown) and 20A (not shown), and the RF resonant inductor L2 includes electrodes 19B and 20B. Specifically, the RF input conductor 11A is physically directly connected to the inductive metal structure 13A to form an electrode 19A of the inductor L1, and the inductive metal structure 13A is physically connected to the metal inner cavity 18 to form another electrode 20A of the inductor L1; one end of the RF output conductor 11B is connected to the inductive metal structure 13B to form another electrode 19B of the inductor L2; the inductive metal structure 13B is physically connected to the metal inner cavity 18 to form another electrode 20B of the inductor L2; the two electrodes 20A / 20B are connected through the inner metal cavity 18 to form a physical parallel connection of the two RF resonant inductors L1 / L2, forming the physical structure of the RF resonant inductors L1 / L2, such as Figure 4 shown.

[0054] It should be understood that the inner metal cavity 18 is a built-in pure metal structure, and its function is equivalent to a short-circuit stub (STUB, stub line) in the circuit. The inner metal cavity 18 plays the role of a short-circuit stub, interconnecting the two inductor structures L1 / L2 together, and realizing the electrical interconnection of the ports of the RF resonant inductor L1 / L2. In the embodiment of the present application, the internal inductor structure is a precision mechanical structure, which can be realized by a symmetrical or asymmetrical structure.

[0055] In the embodiment of the present application, the inner and outer metal cavities are physically isolated from each other, the RF input conductor 11A and the RF output conductor 11B are assembled in the inner metal cavity 18, the inductive metal structures 13A / 13B of the two RF resonant inductors L1 / L2, the planar metal structures 12A / 12B of the RF coupling capacitors C1 / C2, and the insulating dielectric material layer 16 together constitute a RF frequency-selective resonant network, which can effectively improve the electromagnetic shielding performance and grounding performance of the protective device, and facilitate the grounding of the protective device. The distributed parameters between each device (including but not limited to the distributed resistance R, the distributed capacitance C, and the distributed inductance L) determine the basic working frequency band, bandwidth, and RF performance (including the standing wave coefficient VSWR and the insertion loss IL) of the constant impedance RF circuit, and can transmit RF signals within the corresponding working frequency band.

[0056] In the embodiment of the present application, the inner and outer metal cavities are physically isolated from each other, and the inner metal cavity 18 can be used as an electrical parallel short stub of the electrodes at one end of the RF resonant inductor L1 and L2, and the outer metal cavity 17 and the metal end cap 15A / 15B together form a sealed metal shell. The inner metal cavity 18 and the outer metal cavity 17 can be in an open circuit state or a short circuit state (for example, if there is no conductor directly connected between the inner cavity and the outer cavity, it is considered an open circuit, and if there is a short-circuit conductor directly connected, it is considered a short circuit), and there is no effect on the impedance between the RF input conductor 11A and the RF output conductor 11B, and there is no change in the RF performance (VSWR & IL), showing a constant impedance characteristic. When the protection device fails and causes the protection circuit itself to fail, the circuit impedance often changes, thereby causing a system failure; and if the present solution is simply a protection device failure, the circuit impedance will not change, which will not affect the normal function of the system, thereby being able to solve the practical engineering problem of not degrading the function of the protected system itself.

[0057] In the embodiment of the present application, the circuit impedance Z0 mainly depends on the values ​​of the two resonant inductors L1 and L2 and the RF coupling capacitor C3, and has nothing to do with the electromagnetic pulse protection suppression device used in the circuit. Even if the electromagnetic pulse protection suppression device fails, it will not affect the impedance of the entire circuit, thereby constructing an electromagnetic pulse protection constant impedance circuit.

[0058] In addition, by connecting with various RF coaxial transmission lines through standard 50-ohm RF transmission lines, electromagnetic pulse protection can be achieved for key sensitive parts of the RF link.

[0059] In an optional embodiment of the present application, the outer metal cavity 17 and one of the two metal end covers 15 (ie, the metal end cover 15A or the metal end cover 15B) can be designed as an integrated structure, so that the overall structure of the present invention is compact, simple and convenient, and has better shielding performance.

[0060] In an optional embodiment of the present application, a first waterproof groove is provided at the contact end surface between the outer metal cavity 17 and the metal end cover 15; the metal end cover 15 includes a metal end cover 15A and / or a metal end cover 15B; a first conductive rubber 21 of matching shape and size is provided in the first waterproof groove, see Figure 5 Specifically, the first waterproof groove can be set as an annular structure along the contact end surface, and correspondingly, the first conductive rubber 21 can use an O-type waterproof conductive rubber ring that matches the shape of the first waterproof groove, so that the outer metal cavity 17 and the metal end cover 15 have an interference fit to ensure the overall sealing of the system. At the same time, it does not affect the electrical connection performance between the outer metal cavity 17 and the metal end cover 15.

[0061] In an optional embodiment of the present application, in order to improve the overall sealing of the system, a second waterproof groove may be provided at the contact end surface between the metal end cover 15 and the RF input port and the RF output port; a second conductive rubber 22 of matching shape and size is provided in the second waterproof groove, see Figure 5 Specifically, the second waterproof groove can be set as an annular structure along the contact end surface, and correspondingly, the second conductive rubber 22 can use an O-type waterproof conductive rubber ring that matches the shape of the second waterproof groove, so that the metal end cover 15 and the RF input port and the RF output port have an interference fit to ensure the overall sealing of the system.

[0062] The embodiment of the present application is implemented by adopting metal structural parts, breaking through the conventional form, realizing the electrical connection between the performance and function of electronic components and circuits, thereby realizing constant impedance circuit performance, avoiding the use of conventional electronic components (such as inductors, capacitors, resistors and other devices implemented in circuit form) to realize circuit and circuit board welding assembly, and improving the reliability of the circuit structure.

[0063] Based on the above embodiments, the present application also provides an electromagnetic pulse protection circuit, referring to Figure 6 , including the constant impedance radio frequency circuit as described above, and also including an electromagnetic pulse suppression device 23, wherein the electromagnetic pulse suppression device 23 is electrically connected between the outer metal cavity 17 and the inner metal cavity 18.

[0064] In the embodiment of the present application, the electromagnetic pulse suppression device 23 has a reconfigurable function, and different types of electromagnetic pulse suppression devices can be placed according to actual protection needs. For example, it can be a gas discharge tube or a transient voltage suppression diode to discharge and absorb and suppress slow-edge strong transient electromagnetic pulses with large energy; it can also be a semiconductor PIN diode (including a tube stack) to discharge and absorb and suppress fast-edge strong transient electromagnetic pulses with small and medium energy. This solution can be flexibly combined as needed, and two types can be used at the same time to achieve the effect of suppressing fast-edge pulses and slow-edge pulses at the same time, thereby improving the electromagnetic pulse protection performance and reliability of wireless equipment and systems.

[0065] The embodiments of the present application can provide electromagnetic pulse protection for wireless radio frequency electronic and electrical equipment and facilities in extremely complex and harsh electromagnetic environments, improve the reliability of radio frequency links, simplify circuits, save costs, and meet the requirements of engineering application practices. The circuit structure has a reconfigurable function, is convenient for field application, and has engineering practical conditions. The samples have been tested to meet relevant technical conditions and achieve good protection effects.

[0066] Based on the above embodiments, the present application also provides a method for implementing a constant impedance radio frequency circuit for electromagnetic pulse protection, see Figure 7 As shown, it mainly includes:

[0067] The outer metal cavity 17 is placed on the installation station, and the metal end cover 15A with the insulating dielectric plate 14A pasted on the inner surface is fixedly installed on one of the openings of the outer metal cavity 17 to achieve sealing of the opening; a through hole is opened in the middle of the metal end cover 15A; and a through hole is provided on the insulating dielectric plate 14A, which is opposite to the through hole of the metal end cover 15A.

[0068] In an optional embodiment of the present application, the outer metal cavity 17 and the metal end cover 15A can be set as an integrated structure, and the metal end cover 15A does not need to be installed. However, the insulating dielectric plate 14A needs to be pasted on the metal end cover 15A for subsequent bonding between the metal end cover 15A and the insulating dielectric plate 14A to prevent the insulating dielectric plate 14A from shifting.

[0069] The output end of the electromagnetic pulse suppression device 23 is mounted on an output interface provided on the inner surface of the outer metal cavity 17 through another opening of the outer metal cavity 17 to achieve electrical connection between the electromagnetic pulse suppression device 23 and the outer metal cavity 17 .

[0070] The inner metal cavity 18 is placed into the outer metal cavity 17 through another opening of the outer metal cavity 17, and the input end of the electromagnetic pulse suppression device 23 is connected to the input interface set on the outer surface of the inner metal cavity 18 to achieve electrical connection between the inner metal cavity 18 and the electromagnetic pulse suppression device 23, and to achieve positioning of the inner metal cavity 18 inside the outer metal cavity 17.

[0071] One opening of the inner metal cavity 18 is sealed in advance by the inductive metal structure 13A, and the inductive metal structure 13A is in contact with the insulating dielectric plate 14A; the inductive metal structure 13A is provided with a through hole corresponding to the through hole of the insulating dielectric plate 14A.

[0072] The RF input conductor 11A is placed into the inner metal cavity 18 through another opening of the outer metal cavity 17 and another opening of the inner metal cavity 18; and the input end of the RF input conductor 11A is inserted into the through hole of the inductive metal structure 13A, and passes through the through hole of the insulating dielectric plate 14A and the through hole of the metal end cover 15A in sequence, and extends to the outside of the outer metal cavity 17; the contact surface between the RF input conductor 11A and the metal end cover 15A is provided with an insulating layer to ensure that there is no electrical connection between the RF input conductor 11A and the metal end cover 15A; the contact surface between the RF input conductor 11A and the inductive metal structure 13A is exposed to ensure that the RF input conductor 11A is directly electrically connected to the inductive metal structure 13A; at one end of the RF input conductor 11A, a planar metal structure 12A is electrically connected; and an insulating dielectric material layer 16 is bonded to the end of the planar metal structure 12A away from the RF input conductor 11A. The insulating dielectric material layer 16 may be made of any insulating material, and this embodiment does not impose any limitation on this.

[0073] At one end of the RF output conductor 11B, a planar metal structure 12B is electrically connected; and adhesive is coated on one end of the planar metal structure 12B away from the RF input conductor 11B; the embodiment of the present application does not limit the type of adhesive, as long as it can achieve stable bonding between the materials.

[0074] The end coated with the adhesive is aligned and bonded to the insulating dielectric material layer 16 to fix the RF output conductor 11B.

[0075] The through hole in the middle of the inductive metal structure 13B is aligned with the RF output conductor 11B, and the inductive metal structure 13B is sleeved on the RF output conductor 11B, and is installed and fixed to another opening of the inner metal cavity 18 to achieve sealing of the opening; the contact surface between the RF output conductor 11B and the inductive metal structure 13B is exposed to ensure direct electrical connection between the RF output conductor 11B and the inductive metal structure 13B.

[0076] The insulating dielectric plate 14B is bonded to the side of the metal end cover 15B facing the inner metal cavity 18, and the through hole opened in the insulating dielectric plate 14B is opposite to the through hole opened on the metal end cover 15B; the through hole opened in the middle of the metal end cover 15B is aligned with the RF output conductor 11B, so that the metal end cover 15B is sleeved on the RF output conductor 11B, and is installed and fixed to the other opening of the outer metal cavity 17 to achieve sealing of the opening; an insulating layer is provided on the contact surface between the RF output conductor 11B and the metal end cover 15B to ensure that there is no electrical connection between the RF output conductor 11B and the metal end cover 15B; the output end of the RF output conductor 11B is located outside the outer metal cavity 17, which is convenient for connection with the RF output port.

[0077] In an optional embodiment of the present application, the end of the RF input conductor 11A away from the planar metal structure 12A is connected to the RF input port for convenient transmission of external RF signals; the end of the RF output conductor 11B away from the planar metal structure 12B is connected to the RF output port for convenient output of the RF output signal after protection processing. The RF input port and the RF output port can use a 50-ohm RF transmission line port structure to facilitate connection with various external RF coaxial transmission lines, so as to realize electromagnetic pulse protection and RF signal transmission of key sensitive parts on the RF link.

[0078] The constant impedance RF circuit provided in the embodiment of the present application can have excellent RF performance and adaptability to ambient temperature within the effective working bandwidth; it can simultaneously complete the suppression and absorption functions of various strong transient electromagnetic pulses and the effective transmission of RF coaxial signals, solve the compatibility problems of various strong transient electromagnetic pulse protection circuits, and achieve significant comprehensive protection effects against various strong transient electromagnetic pulses.

[0079] As described above, the above embodiments are only used to introduce the technical solution of the present application in detail, but the description of the above embodiments is only used to help understand the method and core idea of ​​the present application and should not be understood as limiting the present application. Any changes or substitutions that can be easily thought of by technicians in this technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A method for implementing a constant impedance radio frequency circuit for electromagnetic pulse protection, characterized in that: include: The outer metal cavity 17 is placed on the installation station, and the metal end cover 15A with the insulating dielectric plate 14A attached to the inner surface is fixedly installed on one of the openings of the outer metal cavity 17 to achieve sealing of the opening; a through hole is opened in the middle of the metal end cover 15A; and a through hole is provided on the insulating dielectric plate 14A, which is opposite to the through hole of the metal end cover 15A; Through another opening of the outer metal cavity 17, the output end of the electromagnetic pulse suppression device 23 is mounted on the output interface provided on the inner surface of the outer metal cavity 17 to achieve electrical connection between the electromagnetic pulse suppression device 23 and the outer metal cavity 17; The inner metal cavity 18 is placed into the outer metal cavity 17 through another opening of the outer metal cavity 17, and the input end of the electromagnetic pulse suppression device 23 is connected to the input interface provided on the outer surface of the inner metal cavity 18, so as to realize the electrical connection between the inner metal cavity 18 and the electromagnetic pulse suppression device 23, and realize the positioning of the inner metal cavity 18 inside the outer metal cavity 17; one of the openings of the inner metal cavity 18 is sealed in advance by the inductive metal structure 13A, and the inductive metal structure 13A is in contact with the insulating dielectric plate 14A; the inductive metal structure 13A is provided with a through hole opposite to the through hole of the insulating dielectric plate 14A; The RF input conductor 11A is placed into the inner metal cavity 18 through another opening of the outer metal cavity 17 and another opening of the inner metal cavity 18; and the input end of the RF input conductor 11A is inserted into the through hole of the inductive metal structure 13A, and sequentially passes through the through hole of the insulating dielectric plate 14A and the through hole of the metal end cover 15A, and extends to the outside of the outer metal cavity 17; an insulating layer is provided on the contact surface between the RF input conductor 11A and the metal end cover 15A to ensure that there is no electrical connection between the RF input conductor 11A and the metal end cover 15A; the contact surface between the RF input conductor 11A and the inductive metal structure 13A is exposed to ensure that the RF input conductor 11A is directly electrically connected to the inductive metal structure 13A; one end of the RF input conductor 11A is electrically connected to a planar metal structure 12A; and an insulating dielectric material layer 16 is bonded to the end of the planar metal structure 12A away from the RF input conductor 11A; A planar metal structure 12B is electrically connected to one end of the RF output conductor 11B; and an adhesive is applied to one end of the planar metal structure 12B away from the RF input conductor 11B; Align and bond one end coated with the adhesive to the insulating dielectric material layer 16 to fix the RF output conductor 11B; The through hole in the middle of the inductive metal structure 13B is aligned with the RF output conductor 11B, and the inductive metal structure 13B is sleeved on the RF output conductor 11B, and is installed and fixed to another opening of the inner metal cavity 18 to achieve sealing of the opening; the contact surface between the RF output conductor 11B and the inductive metal structure 13B is exposed to ensure that the RF output conductor 11B is directly electrically connected to the inductive metal structure 13B; The through hole opened in the middle of the metal end cover 15B is aligned with the RF output conductor 11B, and is sleeved on the RF output conductor 11B, and is installed and fixed to another opening of the outer metal cavity 17 to achieve sealing of the opening; the contact surface between the RF output conductor 11B and the metal end cover 15B is provided with an insulating layer to ensure that there is no electrical connection between the RF output conductor 11B and the metal end cover 15B; the output end of the RF output conductor 11B is located outside the outer metal cavity 17.

2. The method for implementing a constant impedance radio frequency circuit according to claim 1, wherein: One end of the RF input conductor 11A away from the planar metal structure 12A is connected to the RF input port for transmitting external RF signals; One end of the RF output conductor 11B away from the planar metal structure 12B is connected to the RF output port for outputting the RF output signal after protection processing.

3. A constant impedance radio frequency circuit for electromagnetic pulse protection, characterized in that: include: An outer metal cavity 17, wherein the outer metal cavity 17 is provided with two first openings at opposite positions, wherein the first opening on one side is sealed by a metal end cover 15A, and wherein the first opening on the other side is sealed by a metal end cover 15B; An inner metal cavity 18, wherein the inner metal cavity 18 is disposed inside the outer metal cavity 17 and has no physical contact with the inner surface of the outer metal cavity 17; the inner metal cavity 18 is provided with two second openings at opposite positions, wherein the second opening on one side is sealed by the inductive metal structural member 13A, and the second opening on the other side is sealed by the metal end cover 13B; The RF input conductor 11A is used to transmit the RF input signal. The RF input conductor 11A passes through the metal end cover 15A and the inductive metal structure 13A and extends into the inner metal cavity 18. There is no electrical connection between the RF input conductor 11A and the metal end cover 15A, and the RF input conductor 11A is directly electrically connected to the inductive metal structure 13A. The RF input conductor 11A is located at one end in the inner metal cavity 18 and is electrically connected to a planar metal structure 12A. The RF output conductor 11B passes through the metal end cover 15B and the inductive metal structure 13B, and extends into the inner metal cavity 18; there is no electrical connection between the RF output conductor 11B and the metal end cover 15B, and the RF output conductor 11B is directly electrically connected to the inductive metal structure 13B; and the RF output conductor 11B is located at one end in the inner metal cavity 18, and is electrically connected to a planar metal structure 12B; the planar metal structure 12B is opposite to the planar metal structure 12A, and there is no physical contact between the two.

4. The constant impedance radio frequency circuit according to claim 3, characterized in that: One end of the RF input conductor 11A away from the planar metal structure 12A is connected to a RF input port for transmitting an external RF signal; One end of the RF output conductor 11B away from the planar metal structure 12B is connected to a RF output port for outputting a RF output signal after protection processing.

5. The constant impedance radio frequency circuit according to claim 4, characterized in that: The radio frequency input port is a 50-ohm transmission line input port, and the radio frequency output port is a 50-ohm transmission line output port.

6. The constant impedance radio frequency circuit according to claim 3, characterized in that: An insulating dielectric plate 14 is provided between the outer metal cavity 17 and the inner metal cavity 18; An insulating dielectric material layer 16 is filled between the planar metal structure 12B and the planar metal structure 12A.

7. The constant impedance radio frequency circuit according to claim 3, characterized in that: A first waterproof groove is provided at the contact end surface between the outer metal cavity 17 and the metal end cover 15; the metal end cover 15 includes the metal end cover 15A and / or the metal end cover 15B; A first conductive rubber 21 of matching shape and size is disposed in the first waterproof groove.

8. The constant impedance radio frequency circuit according to claim 7, characterized in that: A second waterproof groove is provided at the contact end surface between the metal end cover 15 and the RF input port; A second conductive rubber 22 of matching shape and size is disposed in the second waterproof groove.

9. An electromagnetic pulse protection circuit, characterized in that: It includes the constant impedance radio frequency circuit as described in any one of claims 3-8, and also includes an electromagnetic pulse suppression device 23, and the electromagnetic pulse suppression device 23 is electrically connected between the outer metal cavity 17 and the inner metal cavity 18.

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