Radio frequency coaxial line and communication system for suppressing common-mode current

Abstract

The invention provides a radio frequency coaxial line for inhibiting common mode current and a communication system, the radio frequency coaxial line comprises a coaxial line body, the coaxial line body comprises an inner conductor and a shielding layer which are arranged at an interval, and the shielding layer sleeves the outer side of the inner conductor; the suppression structure comprises a conducting layer and a non-conducting layer, the conducting layer and the non-conducting layer are sequentially arranged on the outer side of the shielding layer in the direction from the inner conductor to the shielding layer, and the conducting layer and / or the non-conducting layer at least partially wrap the shielding layer in the circumferential direction of the coaxial line body; wherein the conductive layer is used for providing a low-resistance backflow path for common-mode current on the shielding layer, and the non-conductive layer is used for absorbing, blocking or dissipating common-mode energy. According to the radio frequency coaxial line for suppressing the common mode current and the communication system, consumption attenuation of the common mode current is realized, so that the influence caused by the common mode current is greatly reduced.

Description

Technical Field

[0001] This disclosure relates to the field of radio frequency coaxial cable technology, and more particularly to a radio frequency coaxial cable and communication system for suppressing common-mode current. Background Technology

[0002] RF coaxial cable is a type of coaxial cable specifically designed for transmitting high-frequency radio signals (RF signals). It is an indispensable basic component in fields such as wireless communication, broadcasting, radar, and test and measurement. When traditional RF coaxial cables operate at high frequencies (greater than 3 GHz), the outer conductor (shielding layer) forms an asymmetrical coupling with the surrounding environment, causing common-mode current (shield current) to propagate along the outer surface, which severely affects signal transmission.

[0003] Traditionally, ferrite cores are used, but their bandwidth is limited and their high-frequency suppression is poor. To improve high-frequency suppression, a larger size is required, resulting in an excessively large overall size of the RF coaxial cable, which limits its applications. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the purpose of this disclosure is to provide a radio frequency coaxial cable and communication system that suppresses common-mode current.

[0006] To achieve the above objectives, a first aspect of this disclosure provides a radio frequency coaxial line for suppressing common-mode current, comprising: a coaxial line body, the coaxial line body including: an inner conductor and a shielding layer arranged at intervals, wherein the shielding layer is sleeved on the outside of the inner conductor; at least one suppression structure, the suppression structure including: a conductive layer and a non-conductive layer, the conductive layer and the non-conductive layer being arranged sequentially on the outside of the shielding layer along the direction from the inner conductor to the shielding layer, and the conductive layer and / or the non-conductive layer at least partially enclosing the shielding layer along the circumferential direction of the coaxial line body; wherein the conductive layer is used to provide a low-resistance return path for common-mode current on the shielding layer, and the non-conductive layer is used to absorb, impede, or dissipate common-mode energy.

[0007] Optionally, the at least one suppression structure includes: a plurality of suppression structures, wherein the plurality of suppression structures are arranged sequentially on the outside of the shielding layer along the direction from the inner conductor to the shielding layer; wherein the conductive layers of adjacent suppression structures are connected by interlayer electrical connectors, and the interlayer electrical connectors are used to adjust the common-mode impedance between adjacent conductive layers.

[0008] Optionally, the interlayer electrical connector is a direct metal bridge, and the direct metal bridge includes at least one of: solder joint, conductive adhesive, and metallized via.

[0009] Optionally, the interlayer electrical connector is an electronic component, and the electronic component includes at least one of the following: inductor, capacitor, resistor, and transient voltage suppression diode.

[0010] Optionally, the number of the inhibition structures is not less than three.

[0011] Optionally, the conductive layer and the non-conductive layer may wrap around the shielding layer along the circumferential portion of the coaxial body.

[0012] Optionally, the non-conductive layer may be made of at least one of ferrite material, microwave absorbing material, and resistive material.

[0013] Optionally, the relative permeability of the ferrite material is in the range of 100-2000; and / or, the attenuation constant of the absorbing material in the frequency band of 1GHz-40GHz is greater than or equal to 20dB / cm; and / or, the sheet resistance of the resistive material is in the range of 50Ω / sq-1000Ω / sq.

[0014] Optionally, the conductive layer is made of at least one of silver-plated copper foil, copper braided mesh, conductive polymer film, and metallized fabric; and / or, the thickness of the conductive layer ranges from 5µm to 200µm.

[0015] A second aspect of this disclosure provides a communication system, characterized in that it includes: a radio frequency coaxial cable for suppressing common-mode current as provided in the first aspect of this disclosure.

[0016] The technical solution provided in this disclosure may include the following beneficial effects: The conductive layer and the non-conductive layer are arranged sequentially on the outside of the shielding layer along the direction from the inner conductor to the shielding layer, and the conductive layer and / or the non-conductive layer at least partially wrap the shielding layer along the circumference of the coaxial cable body. This allows the conductive layer to provide a low-resistance return path for the common-mode current on the shielding layer and to absorb, impede, or dissipate common-mode energy using the non-conductive layer. This achieves the attenuation of the common-mode current, thereby significantly reducing the impact of the common-mode current and ensuring high-efficiency and high-quality signal transmission of the coaxial cable body.

[0017] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a radio frequency coaxial line for suppressing common-mode current according to an embodiment of this disclosure; Figure 2This is a partial cross-sectional schematic diagram of a radio frequency coaxial line for suppressing common-mode current according to an embodiment of this disclosure; Figure 3 This is a partial cross-sectional schematic diagram (partially enclosed) of an embodiment of the radio frequency coaxial line for suppressing common-mode current proposed in this disclosure. Figure 4 This is a schematic diagram of the structure of an interlayer electrical connector for suppressing common-mode current in an embodiment of the present disclosure; Figure 5 This is an equivalent circuit diagram of a radio frequency coaxial line for suppressing common-mode current according to an embodiment of this disclosure; As shown in the figure: 1. Coaxial cable body, 11. Inner conductor, 12. Shielding layer, 13. Dielectric layer; 2. Suppression structure, 21. Conductive layer, 22. Non-conductive layer, 231. Inductor, 232. Capacitor, 233. Resistor, 234. Transient voltage suppression diode. Detailed Implementation

[0019] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0020] like Figure 1 and Figure 2 As shown in the figure, this disclosure proposes a radio frequency coaxial line for suppressing common-mode current, comprising: a coaxial line body 1 and at least one suppression structure 2. The coaxial line body 1 includes: an inner conductor 11 and a shielding layer 12 arranged at intervals, with the shielding layer 12 sleeved on the outside of the inner conductor 11. The suppression structure 2 includes: a conductive layer 21 and a non-conductive layer 22, which are sequentially arranged on the outside of the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12, and the conductive layer 21 and / or the non-conductive layer 22 at least partially enclose the shielding layer 12 along the circumferential direction of the coaxial line body 1. The conductive layer 21 is used to provide a low-resistance return path for the common-mode current on the shielding layer 12, and the non-conductive layer 22 is used to absorb, impede, or dissipate common-mode energy.

[0021] It is understandable that the coaxial cable body 1 uses the inner conductor 11 to transmit signals and the shielding layer 12 to shield and protect the signals. However, when the coaxial cable body 1 transmits high-frequency signals, the shielding layer 12 forms asymmetrical coupling with the surrounding environment, causing common-mode current to propagate along the outer surface, which seriously affects the transmission of signals.

[0022] In this embodiment, the conductive layer 21 and the non-conductive layer 22 are arranged sequentially on the outside of the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12, and the conductive layer 21 and / or the non-conductive layer 22 at least partially wrap the shielding layer 12 along the circumference of the coaxial cable body 1, so that the conductive layer 21 can provide a low-resistance return path for the common-mode current on the shielding layer 12 and use the non-conductive layer 22 to absorb, impede or dissipate the common-mode energy, thereby realizing the consumption and attenuation of the common-mode current, thereby greatly reducing the impact caused by the common-mode current, and thus ensuring the high efficiency and high quality of signal transmission of the coaxial cable body 1.

[0023] It should be noted that, compared with traditional ferrite magnetic rings, this embodiment utilizes the combination of conductive layer 21 and non-conductive layer 22 to achieve common-mode current suppression, resulting in a smaller size and wider bandwidth. At the same time, it achieves better electromagnetic interference suppression within a smaller size and with a wider bandwidth.

[0024] Traditional ferrite cores suffer from several problems due to the propagation of common-mode current, such as radiated electromagnetic interference (EMI), affecting adjacent circuits; common-mode current being converted into differential-mode noise, reducing signal integrity; and antenna pattern distortion, leading to decreased efficiency. This embodiment employs a combined suppression structure 2 of conductive layer 21 and non-conductive layer 22, which effectively solves the broadband electromagnetic interference problem in high-speed cable communication and the pattern interference problem caused by common-mode current interference in RF antenna applications.

[0025] Due to its smaller size and wider bandwidth, the RF coaxial cable of this embodiment has a wider range of applications, including high-frequency communication systems, RF front-end modules, and antenna feeders.

[0026] The inner conductor 11 in the coaxial cable body 1 is used to transmit signals, and the shielding layer 12 is used to shield and protect the inner conductor 11. Meanwhile, the inner conductor 11 and the shielding layer 12 can be spaced apart by a dielectric layer 13. The specific type of the coaxial cable body 1 can be set according to actual needs and there are no restrictions on it.

[0027] The conductive layer 21 in the suppression structure 2 not only forms a secondary shield of "Faraday cage", but also serves as a return path for common-mode current, playing a role in reflection and current conduction. The non-conductive layer 22 in the suppression structure 2 is used for the absorption, obstruction and dissipation of common-mode energy. The specific types of conductive layer 21 and non-conductive layer 22 can be set according to actual needs, and there are no restrictions on them.

[0028] like Figure 1 and Figure 2As shown, in some embodiments, at least one suppression structure 2 includes a plurality of suppression structures 2, which are sequentially arranged on the outside of the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12. The conductive layers 21 of adjacent suppression structures 2 are connected by interlayer electrical connectors, which are used to adjust the common-mode impedance between adjacent conductive layers 21.

[0029] It is understandable that multiple suppression structures 2 are arranged sequentially on the outside of the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12, realizing the alternating arrangement of multiple conductive layers 21 and multiple non-conductive layers 22 on the outside of the shielding layer 12. This allows the common-mode current to be reflected and absorbed multiple times by the alternating conductive layers 21 and non-conductive layers 22, forming multi-level attenuation and avoiding the thickness limitation of a single material. Thus, better electromagnetic interference suppression effect can be achieved in a smaller size and with a wider bandwidth.

[0030] Furthermore, based on the interlayer electrical connector between the conductive layers 21 of the adjacent suppression structure 2, the common-mode impedance between the adjacent conductive layers 21 is adjusted, thereby achieving efficient dissipation of common-mode current by utilizing the adapted common-mode impedance, and thus improving the suppression effect.

[0031] It should be noted that the multiple suppression structures 2 are arranged in sequence, so that the common-mode current is reflected, absorbed, re-reflected, re-absorbed, re-reflected, and re-absorbed in sequence from the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12. This causes the common-mode energy to decay continuously, thereby greatly reducing the impact of the common-mode current.

[0032] Interlayer electrical connectors are used to connect adjacent conductive layers 21 and to adjust the common-mode impedance between adjacent conductive layers 21. The specific type of interlayer electrical connector can be set according to actual needs and there are no restrictions on it.

[0033] In some embodiments, the interlayer electrical connector is a direct metal bridge, and the direct metal bridge includes at least one of: solder joint, conductive adhesive, and metallized via.

[0034] Understandably, based on solder joints, conductive adhesive, metallized vias, etc., direct metal bridges can directly connect adjacent conductive layers 21 and form low-resistance channels between adjacent conductive layers 21, ensuring high-efficiency common-mode current suppression.

[0035] It should be noted that the solder joint is the connection point formed by connecting two conductive layers 21 together with molten solder (such as tin-lead or lead-free solder paste). For solder joint type direct metal bridge, the axial ends of adjacent conductive layers 21 are electrically connected by solder joint welding.

[0036] Conductive adhesive is an adhesive with added conductive fillers (such as silver microparticles). It achieves bonding and conductivity through curing. For direct metal bridges of conductive adhesive type, the axial ends of adjacent conductive layers 21 are bonded and electrically connected by conductive adhesive.

[0037] Metallized vias are holes whose walls are plated with a layer of metal (usually copper) through chemical deposition and electroplating processes, thereby achieving electrical interconnection between two conductive layers 21. For direct metal bridges of the metallized via type, the axial ends of adjacent conductive layers 21 are electrically connected through metallized vias.

[0038] like Figure 4 As shown, in some embodiments, the interlayer electrical connector is an electronic component, and the electronic component includes at least one of the following: inductor 231, capacitor 232, resistor 233, and transient voltage suppression diode 234.

[0039] It is understandable that, based on inductors 231, capacitors 232, resistors 233, transient voltage suppression diodes 234, etc., electronic components can form different impedance forms while connecting adjacent conductive layers 21, thereby achieving flexible adaptation and ensuring high-efficiency common-mode current suppression.

[0040] It should be noted that the function of inductor 231 (L) is to store magnetic energy and allow direct current to pass through while impeding alternating current. The ability to generate a magnetic field is called "inductance 231," and its unit is Henry (H). Its core characteristics are that it allows direct current to pass while blocking alternating current, and the current cannot change abruptly. Electronic components with inductor 231 can suppress high-frequency common-mode interference. Inductors 231 are arranged in series; for example, the value of inductor 231 can be 10nH-1µH.

[0041] The function of a capacitor 232 (C) is to store electrical charge (energy) and allow alternating current to pass through while blocking direct current. The ability to store charge is called "capacitance 232," and its unit is the farad (F). Its core characteristics are blocking DC and passing AC, and preventing sudden voltage changes. Electronic components using capacitor 232 can provide high-frequency bypass. Capacitors 232 are typically arranged in parallel; for example, the value of a capacitor 232 can range from 1pF to 100pF.

[0042] The function of a resistor 233 (R) is to impede the flow of current. It is the most basic energy-consuming component in a circuit. The function of impeding current is called "resistance 233", and its unit is ohms (Ω). Its main functions are current limiting and voltage division. For electronic components of the 233 type, it can provide damping. Resistors 233 are arranged in parallel. For example, the value of resistor 233 can be 1Ω-100Ω.

[0043] The transient voltage suppressor diode 234 (TVS) functions as a circuit protector, rapidly absorbing or dissipating sudden high-voltage pulses to protect downstream precision components. Under normal operating voltage, it presents a high-resistance state (virtually ineffective). When encountering instantaneous high voltage (such as electrostatic discharge or lightning surges), it can rapidly transition to a low-resistance state (picoseconds) to dissipate the high-voltage energy, thus clamping the voltage to a safe value. For electronic components using the TVS diode 234, it also provides electrostatic discharge.

[0044] Based on inductor 231, capacitor 232, resistor 233, and transient voltage suppression diode 234, the example interlayer equivalent circuit diagram is as follows: Figure 5 As shown.

[0045] In some embodiments, the number of suppression structures 2 is not less than three.

[0046] It is understandable that by using no less than three suppression structures 2, at least three sets of conductive layers 21 and non-conductive layers 22 are alternately arranged on the outside of the shielding layer 12, so that the common-mode current can be reflected and absorbed at least three times by the alternately arranged conductive layers 21 and non-conductive layers 22, thereby achieving a better electromagnetic interference suppression effect.

[0047] Specifically, the outer side of the shielding layer 12 is arranged with a first suppression structure 2, a second suppression structure 2, a third suppression structure 2, a fourth suppression structure 2, etc., and each suppression structure 2 reflects and absorbs the common-mode current in turn to achieve layer-by-layer attenuation.

[0048] like Figure 3 As shown, in some embodiments, the conductive layer 21 and the non-conductive layer 22 wrap around the shielding layer 12 along the circumferential portion of the coaxial body 1.

[0049] It is understandable that, since the conductive layer 21 and the non-conductive layer 22 partially wrap the shielding layer 12 along the circumferential portion of the coaxial line body 1, and the remaining portion is exposed or filled with air, medium, etc., the directional radiation suppression of the coaxial line body 1 is achieved, which has greater flexibility.

[0050] For example, the conductive layer 21 and the non-conductive layer 22 can cover 120 degrees, 240 degrees, etc. in the circumferential direction of the coaxial body 1 to achieve partial encapsulation of the shielding layer 12.

[0051] It should be noted that the exposed portions of the conductive layer 21 and the non-conductive layer 22 at different locations may overlap or partially overlap in the axial direction of the coaxial body 1, or they may not overlap in the axial direction of the coaxial body 1; there are no restrictions on this.

[0052] In some embodiments, the non-conductive layer 22 is made of at least one of ferrite material, microwave absorbing material, and resistor 233 material.

[0053] It is understandable that by utilizing at least one of ferrite materials, absorbing materials, and resistor 233 materials, the absorption, blocking, and dissipation of common-mode energy are achieved, thereby ensuring efficient suppression of common-mode current.

[0054] Among them, ferrite materials can provide high permeability in the frequency range of 1MHz-1GHz and absorb magnetic flux; wave-absorbing materials can absorb electromagnetic waves and convert them into heat energy in the frequency range of 1GHz-40GHz; and resistor 233 materials can dissipate residual common-mode current through distributed I²R and reduce Q value.

[0055] It should be noted that ferrite materials are ferromagnetic metal oxides, usually composed of oxides of metals such as iron, manganese, zinc, and nickel. Its resistivity is much higher than that of metals, so the eddy current loss generated in high-frequency magnetic fields is very small. Its core functions are magnetic conduction, energy storage, and suppression of high-frequency interference.

[0056] Microwave-absorbing materials are a class of functional materials that can absorb the energy of electromagnetic waves projected onto their surface and dissipate it as heat or other forms of energy through the material's dissipation mechanisms. Common absorption mechanisms include electrical loss (such as conductive graphene) and magnetic loss (such as carbonyl iron). The key properties are complex permittivity and complex permeability, which can reduce unwanted electromagnetic reflection and interference.

[0057] Resistive materials refer to materials with conductivity between that of conductors and insulators and significant resistance characteristics, such as carbon-based materials, metal alloys (such as nichrome wire), and metal oxides. Their core function is to impede the flow of current, thereby achieving current limiting, voltage division, heating, or sensitive measurement.

[0058] For example, the non-conductive layer 22 is formed as a ferrite sheet using a ferrite material (e.g., Ni-Zn, Mn-Zn) with a thickness ranging from 50µm to 500µm and a relative permeability μr ranging from 100 to 2000.

[0059] For example, the non-conductive layer 22 is made of a microwave absorbing material (e.g., carbonyl iron, graphene composite), with a relative permeability μr ranging from 1 to 3, a relative complex permittivity εr ranging from 10 to 30, a thickness ranging from 0.1 mm to 2 mm, and an attenuation constant greater than or equal to 20 dB / cm in the 1 GHz to 40 GHz frequency band.

[0060] For example, the non-conductive layer 22 is formed using a resistive 233 material (e.g., carbon black-filled polymer) to form a resistive 233 thin film with a sheet resistance ranging from 50 Ω / sq to 1000 Ω / sq.

[0061] The non-conductive layer 22 can be formed by methods such as winding, spraying, impregnation, and hot pressing, and there are no restrictions on this.

[0062] In some embodiments, the conductive layer 21 is at least one of silver-plated copper foil, copper braided mesh, conductive polymer film, and metallized fabric.

[0063] It is understandable that by using at least one of silver-plated copper foil, copper braided mesh, conductive polymer film, and metallized fabric, the reflection and conduction of common-mode current are achieved, thereby ensuring efficient suppression of common-mode current.

[0064] It should be noted that silver-plated copper foil is a metal foil with a layer of silver plated on the surface of a highly conductive copper substrate. It combines the excellent mechanical properties of copper with the high conductivity, oxidation resistance and corrosion resistance of silver. Due to the skin effect, the silver layer can provide extremely low surface resistance in high-frequency applications.

[0065] Copper braided wire mesh is a strip or tubular conductor woven from a large number of extremely fine soft copper wires. It has extremely high flexibility and resistance to bending fatigue, can withstand frequent vibration and movement, and provides a huge surface area and excellent current carrying capacity.

[0066] Conductive polymer films are flexible films made by uniformly dispersing conductive fillers (such as carbon black, carbon nanotubes, and metal particles) in a polymer matrix. They combine the lightweight, flexible, and easy-to-process properties of polymers with a certain degree of conductivity.

[0067] Metallized fabrics are flexible conductive fabrics formed by depositing a metal coating (such as silver, copper, or nickel) on the surface of ordinary textiles (such as polyester and nylon) using techniques such as electroplating, chemical plating, or vacuum coating. This successfully combines the breathable, lightweight, and customizable sewing properties of textiles with the conductive shielding properties of metals.

[0068] For example, the thickness of conductive layer 21 ranges from 5µm to 200µm.

[0069] The conductive layer 21 can be formed by electroplating, chemical plating, conductive adhesive bonding, metallized fabric wrapping, etc., and there are no restrictions on the method.

[0070] For multiple suppression structures 2, for example, the conductive layer 21 of the first suppression structure 2 is made of silver-plated copper foil, and the non-conductive layer 22 of the first suppression structure 2 is made of ferrite material; the conductive layer 21 of the second suppression structure 2 is made of silver-plated copper foil, and the non-conductive layer 22 of the second suppression structure 2 is made of microwave absorbing material; the conductive layer 21 of the third suppression structure 2 is made of silver-plated copper foil, and the non-conductive layer 22 of the third suppression structure 2 is made of resistor 233 material.

[0071] The outermost part can be protected by an insulating outer sheath.

[0072] This disclosure also proposes a communication system, including: a radio frequency coaxial cable for suppressing common-mode current as described in this disclosure.

[0073] It is understood that the conductive layer 21 and the non-conductive layer 22 are arranged sequentially on the outside of the shielding layer 12 along the direction from the inner conductor 11 to the shielding layer 12, and the conductive layer 21 and / or the non-conductive layer 22 at least partially wrap the shielding layer 12 along the circumference of the coaxial cable body 1, so that the conductive layer 21 can provide a low-resistance return path for the common-mode current on the shielding layer 12 and use the non-conductive layer 22 to absorb, impede or dissipate the common-mode energy, thereby realizing the consumption and attenuation of the common-mode current, thereby greatly reducing the impact of the common-mode current, and thus ensuring the high efficiency and high quality of signal transmission of the coaxial cable body 1.

[0074] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0075] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A radio frequency coaxial cable for suppressing common-mode current, characterized in that, include: A coaxial cable body, the coaxial cable body comprising: an inner conductor and a shielding layer arranged at intervals, wherein the shielding layer is sleeved on the outside of the inner conductor; At least one suppression structure, the suppression structure comprising: a conductive layer and a non-conductive layer, the conductive layer and the non-conductive layer being sequentially arranged outside the shielding layer along the direction from the inner conductor to the shielding layer, and the conductive layer and / or the non-conductive layer at least partially enclosing the shielding layer along the circumferential direction of the coaxial line body; The conductive layer is used to provide a low-resistance return path for the common-mode current on the shielding layer, and the non-conductive layer is used to absorb, impede, or dissipate common-mode energy.

2. The radio frequency coaxial cable for suppressing common-mode current according to claim 1, characterized in that, The at least one inhibition structure includes: Multiple suppression structures are arranged sequentially on the outside of the shielding layer along the direction from the inner conductor to the shielding layer. The conductive layers of adjacent suppression structures are connected by interlayer electrical connectors, and the interlayer electrical connectors are used to adjust the common-mode impedance between adjacent conductive layers.

3. The radio frequency coaxial cable for suppressing common-mode current according to claim 2, characterized in that, The interlayer electrical connector is a direct metal bridge, and the direct metal bridge includes at least one of the following: solder joint, conductive adhesive, and metallized via.

4. The radio frequency coaxial cable for suppressing common-mode current according to claim 2, characterized in that, The interlayer electrical connector is an electronic component, and the electronic component includes at least one of the following: inductor, capacitor, resistor, and transient voltage suppression diode.

5. The radio frequency coaxial cable for suppressing common-mode current according to claim 2, characterized in that, The number of the inhibition structures is not less than three.

6. The radio frequency coaxial cable for suppressing common-mode current according to claim 1, characterized in that, The conductive layer and the non-conductive layer enclose the shielding layer along the circumferential portion of the coaxial body.

7. The radio frequency coaxial cable for suppressing common-mode current according to claim 1, characterized in that, The non-conductive layer is made of at least one of ferrite material, microwave absorbing material, and resistive material.

8. The radio frequency coaxial cable for suppressing common-mode current according to claim 7, characterized in that, The relative magnetic permeability of the ferrite material ranges from 100 to 2000. And / or, The attenuation constant of the absorbing material is greater than or equal to 20 dB / cm in the 1 GHz-40 GHz frequency band. And / or, The sheet resistance of the resistive material is in the range of 50Ω / sq-1000Ω / sq.

9. The radio frequency coaxial cable for suppressing common-mode current according to claim 1, characterized in that, The conductive layer is made of at least one of silver-plated copper foil, copper braided mesh, conductive polymer film, and metallized fabric. And / or, The thickness of the conductive layer ranges from 5µm to 200µm.

10. A communication system, characterized in that, include: The radio frequency coaxial cable for suppressing common-mode current as described in any one of claims 1-9.

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