Electromagnetic compatibility device and its radiation absorbing apparatus

Abstract

The application discloses an electromagnetic compatibility device and a radiation absorption equipment thereof, and is applied to the technical field of circuits and comprises a first conductor which is telescopic in length direction and is used for absorbing radiation emitted by a target transmission line; a first end of the first conductor is grounded, and a second end of the first conductor is suspended; wherein the direction formed by the first end of the first conductor and the second end of the first conductor is the length direction of the first conductor. The scheme of the application can effectively absorb harmonic interference signals, and has the purposes of reducing harmonic interference, occupying small space and being flexibly arranged, and can be conveniently applied in occasions with limited space. Moreover, the length of the first conductor is adjustable, so that in different occasions, through reasonable setting of the length, appropriate absorption effects can be achieved.

Description

Technical Field

[0001] This invention relates to the field of circuit technology, and in particular to an electromagnetic compatibility device and its radiation absorption equipment. Background Technology

[0002] Products must pass electromagnetic compatibility (EMC) testing before they are allowed to enter the market for user use. This means that when a normal signal propagates, it may generate harmonics that interfere with the wireless transmission of signals from other devices. If this harmonic interference radiation exceeds the testing standards, the product cannot be allowed to enter the market.

[0003] Currently, most methods for shielding harmonic interference radiation use filtering circuits. The drawback of this approach is that it requires circuit modifications, which are costly. Another solution uses shielding enclosures, but these methods have lower flexibility, especially in space-constrained environments, where their application is significantly limited.

[0004] In conclusion, how to effectively reduce harmonic interference radiation to ensure the electromagnetic compatibility performance of equipment is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an electromagnetic compatibility device and its radiation absorption equipment to effectively reduce harmonic interference radiation and ensure the electromagnetic compatibility performance of the device.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A radiation absorbing device, comprising:

[0008] A first conductor that is extendable in length and is used to absorb radiation emitted by a target transmission line; a first end of the first conductor is grounded and a second end of the first conductor is suspended.

[0009] Wherein, the direction formed by connecting the first end and the second end of the first conductor is the length direction of the first conductor.

[0010] In one implementation, it further includes:

[0011] N second conductors, which are extendable in length, are used to absorb radiation emitted by the target transmission line; for each of the N second conductors, the first end of the second conductor is grounded and the second end of the second conductor is left floating.

[0012] Wherein, for each of the N second conductors, the direction formed by connecting the first end of the second conductor to the second end of the second conductor is the length direction of the second conductor;

[0013] The lengths of the first conductor and the N second conductors are all set to a first value 'a'; 'a' is a positive number and 'N' is a positive integer.

[0014] In one embodiment, N second conductors and the first conductor are uniformly arranged around the target transmission line.

[0015] In one implementation, it further includes:

[0016] The length is expandable and retractable, consisting of M third conductors used to absorb radiation emitted by the target transmission line;

[0017] For each of the M third conductors, the first end of the third conductor is grounded, and the second end of the third conductor is left floating.

[0018] Wherein, for each of the M third conductors, the direction formed by connecting the first end of the third conductor to the second end of the third conductor is the length direction of the third conductor; M is a positive integer;

[0019] The lengths of the first conductor and the M third conductors are all different to absorb radiation of different frequency bands emitted by the target transmission line.

[0020] In one embodiment, the first conductor is a linear first conductor or a sheet-like first conductor.

[0021] In one implementation, it further includes:

[0022] An arc-shaped fourth conductor is arranged around the target transmission line to absorb radiation emitted by the target transmission line.

[0023] The fourth conductor has K connection points along its length, and each of the K connection points is grounded through a K connection line.

[0024] Wherein, the direction formed by connecting the first end and the second end of the fourth conductor is the length direction of the fourth conductor, and K is a positive integer.

[0025] In one embodiment, the fourth conductor is arranged around the target transmission line and is located on a first side of the target transmission line;

[0026] The radiation intensity of the first side of the target transmission line is higher than that of the second side of the target transmission line.

[0027] In one embodiment, a first capacitor is also included:

[0028] The first terminal of the first capacitor is connected to the first terminal of the first conductor, and the second terminal of the first capacitor is grounded.

[0029] In one implementation, a first inductor is also included;

[0030] The first end of the first inductor is connected to the second end of the first capacitor, and the second end of the first inductor is grounded.

[0031] An electromagnetic compatibility device includes the radiation absorbing device as described above.

[0032] The technical solution provided by this invention reduces harmonic interference by using a radiation absorption device. Specifically, the radiation absorption device may include a first conductor that is stretchable in length and used to absorb radiation emitted by a target transmission line. The first end of the first conductor is grounded, and the second end is suspended. The length direction of the first conductor refers to the direction formed by connecting the first end and the second end. It can be seen that since the first conductor is placed near the target transmission line, it can absorb the radiation emitted by the target transmission line using the principle of antenna radiation, thus absorbing the harmonic interference radiation signal and reducing harmonic interference radiation. Compared to the traditional method of using a shield, this embodiment only requires one first conductor to reduce harmonic interference, occupying less space and offering flexible placement. Even in space-constrained situations, it can still be easily applied. Furthermore, the first conductor is stretchable in length; when the length is different, the frequency band of the absorbed harmonic interference radiation also differs, allowing for flexible adjustment of the first conductor's length to achieve the most suitable absorption effect in different situations.

[0033] In summary, the solution presented in this application can effectively absorb harmonic interference signals and reduce harmonic interference. It occupies little space, is flexible in arrangement, and can be easily applied in space-constrained environments. Furthermore, because the length of the first conductor is adjustable, appropriate absorption effects can be achieved in different situations by setting the length appropriately. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a schematic diagram of the structure of a radiation absorption device according to the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of a radiation absorption device according to a specific embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the fourth conductor in a specific embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of a radiation absorption device according to another specific embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of a radiation absorption device according to another specific embodiment of the present invention. Detailed Implementation

[0040] The core of this invention is to provide a radiation absorption device that can effectively absorb harmonic interference signals and reduce harmonic interference. It occupies little space, is flexible in arrangement, and can be easily applied in space-constrained environments. Furthermore, because the length of the first conductor is adjustable, appropriate absorption effects can be achieved in different situations by setting the length appropriately.

[0041] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a radiation absorbing device according to the present invention. The radiation absorbing device of this application may include:

[0043] The first conductor 10 is extendable in length and is used to absorb radiation emitted by the target transmission line; the first end of the first conductor 10 is grounded and the second end of the first conductor 10 is suspended.

[0044] The direction in which the first end of the first conductor 10 is connected to the second end of the first conductor 10 is the length direction of the first conductor 10.

[0045] Specifically, Figure 1 In this scenario, the target transmission line is specifically a power line. However, it is understood that in other situations, the target transmission line can be other types of lines, such as signal transmission lines on a PCB board, cables that can transmit electrical energy, etc. This application does not limit the source of harmonic interference radiation. Of course, in practical terms, the most common is... Figure 1In situations where a signal is transmitted over a long conductor, if the conductor is not well shielded and the harmonic components in the signal have high energy, harmonic interference will radiate through the conductor. In this case, the conductor can be used as the target transmission line of this application.

[0046] This application utilizes the principle of antenna radiation to absorb harmonic interference. Specifically, a grounding branch, namely the first conductor 10, is set up near the target transmission line. The first conductor 10 can absorb the radiation emitted by the target transmission line, that is, absorb the harmonic interference radiation signal emitted by the target transmission line.

[0047] Since the first conductor 10 is required to absorb the radiation emitted by the target transmission line, according to the absorption principle, one end of the first conductor 10 needs to be grounded. In this application, this grounded end is referred to as the first end of the first conductor 10, while the second end of the first conductor 10 is left unconnected.

[0048] The direction formed by connecting the first end and the second end of the first conductor 10 is the length direction of the first conductor 10, and the first conductor 10 is expandable and contractible in this length direction. Figure 1 In this implementation, since a linear first conductor 10 is used, the length direction is also the extension direction of the linear first conductor 10.

[0049] This application employs a first conductor 10 that is stretchable in length, allowing for flexible adjustment of its length to achieve optimal absorption in different applications. For instance, in one scenario where the target transmission line emits low-frequency radiation under a first operating condition, the length of the first conductor 10 can be adjusted to a longer length to effectively absorb the low-frequency radiation. Conversely, in another scenario where the target transmission line emits high-frequency radiation under a second operating condition, the length of the first conductor 10 can be adjusted to a shorter length to effectively absorb the high-frequency radiation. In other words, different lengths of the first conductor 10 result in different frequency bands of absorbed harmonic interference radiation. Therefore, in practical applications, a suitable length for the first conductor 10 can be selected based on the specific radiation frequency band of the target transmission line to achieve frequency band matching for harmonic interference radiation.

[0050] When realizing the stretchability of the first conductor 10 in the length direction, it can be accomplished through some simple mechanical structure design, and there are many ways to achieve this. This application does not limit this one, as long as it can well fulfill the functional requirements of this application.

[0051] In one specific embodiment of the present invention, the first conductor 10 is a linear first conductor 10 or a sheet-like first conductor 10.

[0052] In practical applications, the first conductor 10 can be a line or a sheet, such as a rectangle, a circle, etc. Of course, it can also be other shapes, including irregular shapes, which do not affect the implementation of the present invention.

[0053] Of course, in practical applications, the linear first conductor 10 and the sheet-shaped first conductor 10 are the most commonly used implementations. Figure 1 This implementation method is also used in the middle. The linear first conductor 10 occupies very little space, and even in situations where space is very limited, the linear first conductor 10 can usually be arranged. Furthermore, it is relatively easy to design the linear first conductor 10 to achieve the function of being stretchable in the length direction.

[0054] The sheet-shaped first conductor 10 has good connection strength. For example, the first conductor 10 is a rectangular metal sheet. One side of the metal sheet is used as its first end, and this side needs to be grounded. For example, the grounding of this side can be achieved by welding or slotting, which can make the connection between the metal sheet and the ground very strong.

[0055] Similarly, the second conductor 20 and the third conductor described in the embodiments below are analogous to the first conductor 10; their specific shapes can be set and adjusted according to actual needs, and will not be repeated here. Furthermore, the accompanying drawings below use linear conductors as examples for illustration.

[0056] In one specific embodiment of the present invention, it may further include:

[0057] N second conductors 20, which are stretchable in length and used to absorb radiation emitted by the target transmission line;

[0058] For each of the N second conductors 20, the first end of the second conductor 20 is grounded, and the second end of the second conductor 20 is left floating.

[0059] Among them, for each of the N second conductors 20, the direction formed by connecting the first end of the second conductor 20 and the second end of the second conductor 20 is the length direction of the second conductor 20;

[0060] The lengths of the first conductor 10 and the N second conductors 20 are all set to a first value a; a is a positive number and N is a positive integer.

[0061] This implementation takes into account that when the target transmission line emits radiation, it radiates in all directions in space. Therefore, to enhance the radiation absorption effect, this implementation includes N second conductors 20 that are extendable in length to absorb the radiation emitted by the target transmission line. The first end of each second conductor 20 is grounded, and the second end is suspended. Furthermore, the length of each second conductor 20 is extendable.

[0062] As described above, the specific shape of the second conductor 20 can be set and adjusted according to actual needs. However, in general, each second conductor 20 and the first conductor 10 can be implemented using the same type of device, which helps to reduce production costs.

[0063] In this embodiment, the lengths of the first conductor 10 and the N second conductors 20 are all set to a first value 'a'. This can effectively address situations where the radiation frequency band emitted by the target transmission line is relatively fixed and the radiation is strong. In other words, since the radiation frequency band emitted by the target transmission line is relatively fixed in such situations, the lengths of the first conductor 10 and the N second conductors 20 are all set to the first value 'a', thereby effectively addressing a large amount of radiation originating from this frequency band. Compared to having only the first conductor 10, the N second conductors 20 in this embodiment can effectively enhance the radiation absorption effect.

[0064] Furthermore, in practical applications, the N second conductors 20 and the first conductor 10 can typically be uniformly arranged around the target transmission line. This is beneficial for absorbing radiation emitted by the target transmission line in different spatial directions. Figure 2 In this case, the first conductor 10 and three second conductors 20 are evenly arranged around the target transmission line.

[0065] In one specific embodiment of the present invention, it may further include:

[0066] M third conductors, which are extendable in length, are used to absorb radiation emitted by the target transmission line;

[0067] For each of the M third conductors, the first end of the third conductor is grounded, and the second end of the third conductor is left floating.

[0068] Wherein, for each of the M third conductors, the direction formed by connecting the first end of the third conductor to the second end of the third conductor is the length direction of the third conductor; M is a positive integer;

[0069] The lengths of the first conductor 10 and the M third conductors are all different to absorb radiation of different frequency bands emitted by the target transmission line.

[0070] This implementation also takes into account that when the target transmission line emits radiation, it will radiate in all directions in space. Therefore, in order to enhance the radiation absorption effect, this implementation provides M third conductors that are stretchable in length and used to absorb the radiation emitted by the target transmission line. The first end of each third conductor is grounded and the second end is suspended. Furthermore, the length of each third conductor is stretchable.

[0071] As described above, the specific shape of the third conductor can be set and adjusted according to actual needs. However, in general, each third conductor and the first conductor 10 can adopt a linear conductor design to facilitate the stretching and adjustment in the length direction.

[0072] In this embodiment, the lengths of the first conductor 10 and the M third conductors are all different. This is because in some cases, the radiation emitted by the target transmission line is strong and the radiation frequency band is widely distributed. Therefore, in order to achieve a good radiation absorption effect, the lengths of the first conductor 10 and the M third conductors are all different in this embodiment, so as to effectively absorb the radiation of different frequency bands emitted by the target transmission line.

[0073] In practical applications, the M third conductors and the first conductor 10 can usually be arranged uniformly around the target transmission line.

[0074] In one specific embodiment of the present invention, it may further include:

[0075] An arc-shaped fourth conductor 30 is arranged around the target transmission line to absorb radiation emitted by the target transmission line.

[0076] The fourth conductor 30 has K connection points along its length, and each of the K connection points is grounded through K connection lines.

[0077] Wherein, the direction formed by connecting the first end of the fourth conductor 30 and the second end of the fourth conductor 30 is the length direction of the fourth conductor 30, and K is a positive integer.

[0078] This implementation takes into account that, in the aforementioned embodiments, the scheme of using M third conductors and the first conductor 10 can effectively absorb radiation of different frequency bands emitted by the target transmission line. However, in some scenarios, due to limited layout space, there may not be enough space to place the M third conductors and the first conductor 10 in the previous embodiments. For example, in one case, one side of the target transmission line can be used to lay out the conductors described in this application, while the other side cannot be arranged with any devices because it is occupied by other devices or is the inner wall of the casing.

[0079] In this embodiment, an arc-shaped fourth conductor 30 can be provided to absorb radiation emitted by the target transmission line. See also... Figure 3 The fourth conductor 30 is arranged around the target transmission line to absorb the radiation emitted by the target transmission line. The direction formed by connecting the first end and the second end of the fourth conductor 30 is the length direction of the fourth conductor 30. Along this length direction, K connection points are provided, and each of the K connection points is grounded through K connection lines. K is a positive integer, usually not less than 2. For example... Figure 3 In this case, the fourth conductor 30 has three connection points along its length, which are grounded through three connection lines.

[0080] Because the fourth conductor 30 in this embodiment is arc-shaped and arranged around the target transmission line, it can effectively absorb radiation from the target transmission line in different directions. Furthermore, since the fourth conductor 30 has K connection points along its length, each grounded through K connecting lines, it can absorb radiation from different frequency bands emitted by the target transmission line to a certain extent. Compared to the previous embodiment with M third conductors, the fourth conductor 30 in this embodiment occupies less space, making it suitable for applications with strict space constraints.

[0081] Furthermore, in this embodiment, the first end and the second end of the fourth conductor 30 can both be suspended, or both can be grounded, or one end can be grounded. That is, the specific location distribution of these K connection points along the length of the fourth conductor 30 can be freely set according to actual needs. For example, in practical applications, the most suitable number and location of connection points can be selected through experimental verification and in combination with the space constraints in the actual scenario.

[0082] Furthermore, in practical applications, the fourth conductor 30 can typically be arranged around the target transmission line and located on the first side of the target transmission line.

[0083] The radiation intensity on the first side of the target transmission line is higher than that on the second side of the target transmission line.

[0084] This implementation takes into account that, in some cases, the radiation intensity on one side of the target transmission line is higher than that on the other side. In this implementation, the side with higher radiation intensity is referred to as the first side of the target transmission line, and the side with lower radiation intensity is referred to as the second side of the target transmission line.

[0085] Because the radiation intensity is higher on the first side of the target transmission line, the fourth conductor 30 can be placed on the first side of the target transmission line to achieve a better radiation absorption effect. For example Figure 3In cases where the radiation intensity is high on the left side of the target transmission line, the fourth conductor 30 is placed on the left side of the target transmission line.

[0086] In one specific embodiment of the present invention, a first capacitor C1 may also be included:

[0087] The first terminal of the first capacitor C1 is connected to the first terminal of the first conductor 10, and the second terminal of the first capacitor C1 is grounded.

[0088] As described above, by adjusting the length of the first conductor 10, the radiation frequency band can be matched to ensure the radiation absorption effect of the first conductor 10. However, this implementation further considers that, in some cases, it may be difficult to achieve good radiation frequency band matching simply by adjusting the length of the first conductor 10, for example, the length of the first conductor 10 may need to be very long or very short.

[0089] For this information, please refer to Figure 4 This implementation takes into account that a first capacitor C1 can be connected in series with the first conductor 10. By selecting the capacitance value of the first capacitor C1, the radiation frequency band that the first conductor 10 can absorb will also be changed. Therefore, this implementation is conducive to more convenient and flexible matching of radiation frequency bands.

[0090] Furthermore, in one specific embodiment of the present invention, a first inductor L1 may also be included;

[0091] The first terminal of the first inductor L1 is connected to the second terminal of the first capacitor C1, and the second terminal of the first inductor L1 is grounded.

[0092] In the above embodiment, a first capacitor C1 connected in series with the first conductor 10 is provided, which makes it easier and more flexible to achieve radiation frequency band matching. This embodiment also takes into account that a first inductor L1 connected in series with the first conductor 10 can be further provided. By selecting the inductance value of the first inductor L1, the radiation frequency band that the first conductor 10 can absorb will also be changed. Therefore, this embodiment further realizes the convenience and flexibility of radiation frequency band matching.

[0093] In this embodiment, the first capacitor C1 is placed at the first end of the first conductor 10, and then the first capacitor C1 is connected to the first inductor L1 and grounded.

[0094] Furthermore, it should be noted that the grounding described in this application, in practical applications, can typically be selected as the PCB ground plane or the main metal body, that is, the main ground of the product is usually selected. Moreover, the aforementioned implementation scheme of adding inductors and capacitors can also be applied to the second conductor 20, the third conductor, and the fourth conductor 30 described above, and this application will not repeat the description therein.

[0095] The technical solution provided by this invention reduces harmonic interference by using a radiation absorption device. Specifically, the radiation absorption device may include a first conductor 10 that is extendable in length and used to absorb radiation emitted by the target transmission line. The first end of the first conductor 10 is grounded, and the second end is suspended. The length direction of the first conductor 10 refers to the direction formed by connecting the first end and the second end of the first conductor 10. It can be seen that since the first conductor 10 is arranged near the target transmission line, it can absorb the radiation emitted by the target transmission line using the principle of antenna radiation, that is, it absorbs the harmonic interference radiation signal, thus reducing harmonic interference radiation. Furthermore, compared to the traditional method of using a shielding cover, this embodiment only requires one first conductor 10 to reduce harmonic interference, occupying less space and offering flexible arrangement. Even in space-constrained situations, it can still be conveniently applied. Furthermore, the first conductor 10 is a conductor that is stretchable in the length direction. When the length is different, the frequency band of the absorbed harmonic interference radiation is also different, so that the most suitable absorption effect can be achieved by flexibly adjusting the length of the first conductor 10 in different situations.

[0096] In summary, the solution proposed in this application can effectively absorb harmonic interference signals and reduce harmonic interference. It occupies little space, is flexible in arrangement, and can be easily applied in space-constrained environments. Furthermore, since the length of the first conductor 10 is adjustable, appropriate absorption effects can be achieved in different situations by setting the length appropriately.

[0097] Corresponding to the above embodiments of radiation absorption devices, this invention also provides an electromagnetic compatibility device, which may include the radiation absorption device as described in any of the above embodiments. It can be referred to in correspondence with the above description and will not be repeated here. The specific device type of this electromagnetic compatibility device may also be various, and this application does not limit it.

[0098] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0100] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A radiation absorbing device, characterized in that, include: The first conductor is stretchable along its length and is used to absorb radiation emitted by the target transmission line. The first end of the first conductor is grounded, and the second end of the first conductor is left floating. Wherein, the direction formed by connecting the first end of the first conductor and the second end of the first conductor is the length direction of the first conductor; Also includes: An arc-shaped fourth conductor is arranged around the target transmission line to absorb radiation emitted by the target transmission line. The fourth conductor has K connection points along its length, and each of the K connection points is grounded through a K connection line. Wherein, the direction formed by connecting the first end and the second end of the fourth conductor is the length direction of the fourth conductor, and K is a positive integer; The fourth conductor is arranged around the target transmission line and is located on a first side of the target transmission line; wherein the radiation intensity of the first side of the target transmission line is higher than the radiation intensity of the second side of the target transmission line. It also includes a first capacitor: the first terminal of the first capacitor is connected to the first terminal of the first conductor, and the second terminal of the first capacitor is grounded; It also includes a first inductor; the first end of the first inductor is connected to the second end of the first capacitor, and the second end of the first inductor is grounded.

2. The radiation absorbing device according to claim 1, characterized in that, Also includes: N second conductors, which are extendable in length, are used to absorb radiation emitted by the target transmission line; For each of the N second conductors, the first end of the second conductor is grounded, and the second end of the second conductor is left floating. Wherein, for each of the N second conductors, the direction formed by connecting the first end of the second conductor to the second end of the second conductor is the length direction of the second conductor; The lengths of the first conductor and the N second conductors are all set to a first value 'a'; 'a' is a positive number and 'N' is a positive integer.

3. The radiation absorbing device according to claim 2, characterized in that, N second conductors and the first conductor are uniformly arranged around the target transmission line.

4. The radiation absorbing device according to claim 1, characterized in that, Also includes: The length is expandable and retractable, consisting of M third conductors used to absorb radiation emitted by the target transmission line; For each of the M third conductors, the first end of the third conductor is grounded, and the second end of the third conductor is left floating. Wherein, for each of the M third conductors, the direction formed by connecting the first end of the third conductor to the second end of the third conductor is the length direction of the third conductor; M is a positive integer; The lengths of the first conductor and the M third conductors are all different to absorb radiation of different frequency bands emitted by the target transmission line.

5. The radiation absorbing device according to claim 1, characterized in that, The first conductor is either a linear conductor or a sheet-like conductor.

6. An electromagnetic compatibility device, characterized in that, Includes the radiation absorbing device as described in any one of claims 1 to 5.

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