WO2020029341A1

WO2020029341A1 - Functionally gradient leaky coaxial cable

Info

Publication number: WO2020029341A1
Application number: PCT/CN2018/102437
Authority: WO
Inventors: 杨志行; 刘中华; 王永池; 吴广; 周雪兵; 邱石
Original assignee: 江苏亨鑫科技有限公司
Priority date: 2018-08-07
Filing date: 2018-08-27
Publication date: 2020-02-13
Also published as: CN109003741A

Abstract

A functionally gradient leaky coaxial cable capable of increasing a signal-to-noise ratio of a terminal signal coverage area, improving the quality of leaky communication, shortening a signal switching area, and stabilizing the switching effect. At least two different groups of slots are arranged on an outer conductor of the same continuously produced leakage cable. The slots in each group of slots are arranged in the same radial region along the length direction of the leakage cable in sequence, different slot groups need to support corresponding target frequency bands when existing separately, and different slot groups need to have performance difference in corresponding target frequency bands when existing separately.

Description

Leaky coaxial cable with gradual performance

Technical field

[0001] The present invention relates to the technical field of leaky cables, and in particular, to a leaky coaxial cable with gradual performance.

Background technique

[0002] The amount of leaking coaxial cables in strip-shaped narrow areas such as tunnels, pipe corridors, and mines is very large, and their transmission performance and radiation performance are relatively stable. Transmission attenuation constants and coupling losses do not change along the leaky cable. The transmission loss increases by the same amount as the distance, which is manifested as the level of the radiated signal becomes smaller and smaller as the length of the leaky cable extends. In practical applications, the signal of the current cell is getting weaker and the signal of the neighboring cell is getting more The stronger, so the designed handover condition can be met in the critical area to complete the handover of the cell. At present, in the same communication project, the same type of leaky cable with the same specification is generally used, and the same leaked cable uses the same slot structure. During the entire leaky communication process, the leaked cable always radiates energy in equal proportions, so the signal is With the increase of the transmission distance, the leaked cable will gradually weaken, and the natural radiation signal will become smaller and smaller. Therefore, in order to meet the communication conditions at the end, the signal is generally very strong in a longer area at the beginning. This phenomenon It is essentially a waste of energy.

Summary of invention

technical problem

Problem solution

Technical solutions

[0003] In view of the above problems, the present invention provides a leaky coaxial cable with gradual performance, which balances the front-end comprehensive loss under the premise of ensuring that the beginning of the leaky cable link meets the communication requirements and that the end-end comprehensive loss is constant. The front-end section of the communication link established by the cable sacrifice certain radiation performance to ensure small transmission loss, effectively extend the coverage radius of the equipment or at the same time sacrifice an appropriate amount of transmission loss at the end section to increase radiation performance, in order to avoid waste of field strength at the end and improve end-signal The signal-to-noise ratio in the coverage area improves leakage communication quality, shortens the signal switching area, and stabilizes the switching effect.

[0004] A leaky coaxial cable with gradual performance is characterized in that at least two different groups of slotted holes are arranged on the outer conductor of the same continuously produced leakage cable, and each of the slotted hole groups is in the slotted hole group. Slot along the leaky cable The positions of the same radial region in the length direction are sequentially arranged. Different slot groups need to support the corresponding target frequency band when they exist separately. Different slot groups have different performance when they exist in the corresponding target frequency band.

[0005] It is further characterized in that, in the case where the leaky cable itself is not cut, it is lengthwise segmented according to the slotting method of the outer conductor of the leaky cable according to the site where the leaky cable is to be arranged, and according to the characteristics of each length area in Corresponding slot groups are set on the outer conductors of the corresponding length areas to ensure that they are still a leaky cable; [0006] For leaky cables in different length areas, different slot groups need to be arranged according to different performance requirements;

[0007] When the different slot groups exist separately, the main polarization mode is the same, that is, if there is a group of slot groups in the combined slot group whose radiation signals are mainly vertically polarized, all the slots combined with it When the hole group is used to make the leakage cable separately, the vertical polarization is mainly used;

[0008] The slot parameters of different slot groups are not completely the same, and the slot parameters specifically include, but are not limited to, slot shape, tapered pitch, slot width, slot length, slotted inclination angle, and slot pitch [0009] The slot hole group includes, but is not limited to, a U-shaped slotted combination, a figure-shaped slotted combination, or a slotted slotted combination.

[0010] The combination of different slot hole groups includes at least one of the following slot hole parameters, different pitch combinations, different slot length combinations, different slot width combinations, different inclination angle combinations, and different slot shape combinations;

[0011] The slot parameters of different slot hole groups when combined include, but are not limited to, arbitrary combination through the above five methods

[0012] The groove shape includes, but is not limited to, the following shapes, a rectangular inclined groove, a rectangular vertical groove, a U-shaped transverse groove, or a slotted groove.

The beneficial effects of the invention

Beneficial effect

[0013] After the above technical solution is adopted, through the combination of different slot groups, the performance of the leaky cable will change with the respective combination structure, and its performance is jointly determined by each slot group. Generally, which one is located in Within the structure, following the performance of the cable leakage when the structure exists alone, it is more complicated near the gradual node, mainly the radiation performance. The specific effect can be estimated through the simulation of the cable leakage, but usually the impact area is very short (within 5m) Can basically be ignored; for the effect evaluation based on the fine-tuning of the mature slotted structure parameters, reference can be made to the performance of the leaked cable when the slotted structure exists alone, combined with experience to estimate, or through simulation. Open at least two different types of slots on the same continuous production leaky cable Group to achieve the purpose of gradual control of the leakage and transmission characteristics of the leaky cable; this method has high requirements for customization. Due to the long length required at the application site, the leaky cable is generally segmented, and the actual segmentation of the application site is required. To produce a gradual leaky cable, and because the gradual slot on a leaky cable has directivity along the length of the leaky cable, it has different electrical properties along the line, and special attention should be paid to the laying direction when laying.

[0014] On the premise of ensuring that the beginning of the leaky cable link meets the communication requirements and that the comprehensive loss at the end is unchanged, the front-end section of the communication link established by the leaky cable sacrifice certain radiation performance to ensure a small transmission loss. Sacrifice an appropriate amount of transmission loss to increase radiation performance, to avoid waste of field strength at the beginning and end, increase the signal-to-noise ratio of the end signal coverage area, improve leaky communication quality, shorten the signal switching area, and stabilize the switching effect;

[0015] On the basis of ensuring that the communication requirements of the front-end section of the leaked cable are met, the radiation ratio is reduced as much as possible to reduce transmission loss and unnecessary energy loss of the front-end leaked cable, so that the signal can be further extended under the premise of ensuring communication, so that Lift equipment coverage radius.

Brief description of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 is a schematic diagram of a conventional combined mode link loss, where comprehensive loss = transmission loss + nominal loss; [0017] FIG. 2 is a schematic diagram of a link loss after the specific implementation of the present invention;

[0018] FIG. 3 is another schematic diagram of link loss after the specific implementation of the present invention;

[0019] FIG. 4 is a schematic view of an arrangement structure of two different types of slot groups;

[0020] FIG. 5 is a second schematic diagram of an arrangement structure of two different types of slot groups;

[0021] FIG. 6 is a third schematic diagram of an arrangement structure of two different types of slot groups;

[0022] FIG. 7 is a schematic diagram of an arrangement structure of two different slot groups;

[0023] FIG. 8 is a schematic view of an arrangement structure of two different slot groups;

[0024] FIG. 9 is a schematic cross-sectional view of the present invention.

The best embodiment for carrying out the invention

Best Mode of the Invention

[0025] A leaky coaxial cable with gradual performance: at least two different sets of slotted holes are arranged on the outer conductor of the same continuously produced leaked cable, and the slotted edges in each set of slotted hole groups The locations of the same radial region in the length direction of the leaky cables are sequentially arranged. Different slot groups need to support the corresponding target frequency band when they exist separately. Different slot groups must exist in the corresponding target frequency band when they exist separately. Performance difference. [0026] In the case where the leaky cable itself is not cut, it is lengthwise segmented according to the slotting method of the outer conductor of the leaky cable according to the site where the leaky cable is to be arranged, according to the characteristics of each length area outside the corresponding length area. A corresponding slot group is set on the conductor to ensure that it is still a leaky cable physically;

[0027] For leaky cables in different length areas, different slot groups need to be arranged according to different performance requirements;

[0028] When the different slot groups exist separately, the main polarization mode is the same, that is, if there is a group of slot groups in the combined slot group whose radiation signals are mainly vertically polarized, all the slots combined with it When the hole group is used to make the leakage cable separately, the vertical polarization is mainly used;

[0029] The slot hole parameters of different slot hole groups are not completely the same, and the slot hole parameters specifically include, but are not limited to, slot hole shape, graded pitch, slot width, slot length, slotted inclination angle, and hole pitch , Slot shape combination style;

[0030] The slotted hole group includes but is not limited to a U-shaped slotted combination, a figure-shaped slotted combination, or a slotted slotted combination

[0031] For a U-shaped slotting combination, it is generally a pair of positive and negative U-shaped slot holes, which are arranged in a periodically repeated pitch P. The slotting parameters of the U-shaped slot include the slot length and slot width. , Arm length, arm width.

[0032] For a figure-eight slotted combination, each "/" and a "\" are combined into a pair to form a "eight" figure, where the spacing between "/" and the corresponding "\" is a half cycle, generally one cycle There are multiple groups of eight characters in P. The number of groups of eight characters is related to the use of bandwidth. At the same time, it can effectively stabilize the field fluctuation of the radiated signal and balance the performance of the leaky cable. The current eight-shaped structure uses the four-eight characters as the mainstream, that is, four in one cycle. "Eight" characters, a total of eight slots.

[0033] For a slotted combination, a slot can be a group, generally placed in a "丨" type, similar to the figure-eight structure, how many "丨" in a cycle, and the use of bandwidth and Relevant to performance, Bayi is currently the mainstream of the glyph structure, that is, there are eight "丨" shapes in a cycle with a total of eight slots.

[0034] The combination of different slot hole groups includes at least one of the following slot hole parameters, different pitch combinations, different slot length combinations, different slot width combinations, different inclination angle combinations, and different slot shape combinations.

[0035] a combination of different pitches, the specific implementation is shown in Figure 4: in the case of other parameters are consistent, the large pitch combination generally has poor radiation performance and good transmission performance, the small pitch combination generally has better radiation performance and attenuation performance Poor; when combining, the combined pitch needs to refer to two slotting pitches, and the reference ratio is 1: 1, as shown in Figure 4, the pitches are

It follows that it rules slotted character "/" and "\" minimum distance of P / 4, shellfish _{IjD 1 = P ^ 4 = 61} mm, D 2 = P 2/4 = 60mm, the combination of pitch D = D , / A + D ₂

/4=63.5mni _' [0036] b Different slot length combinations, the specific implementation is shown in Figure 5: In the case of other parameters being consistent, the relatively short slot group generally has poor radiation performance and good transmission performance, and the relatively long slot group generally has good radiation performance The attenuation performance is poor. For the amount of increase or decrease, refer to the specific expected change in performance and evaluate through simulation.

[0037] c Different slot width combinations, the specific implementation is shown in FIG. 6: In the case of other parameters being consistent, relatively narrow slot groups generally have poor radiation performance and good transmission performance, and relatively wide slot groups generally have good radiation performance. Poor attenuation performance.

[0038] d Different inclination combinations, the specific implementation is shown in Figure 7: In the case of other parameters are consistent, the angle between the slot length and the cable leakage axis can also be adjusted, that is, the slot inclination angle to control (except U-shaped groove), the inclination angle Smaller general radiation performance is worse, transmission performance is better, larger general radiation performance is better, attenuation performance is worse.

[0039] e different groove combinations, the specific implementation is shown in Figure 8: On the premise of meeting the combination conditions, the grooves with the same main polarization mode can be combined, such as a figure-eight structure and a U-shaped structure. Because it is a combination of different grooves, the slotting parameters to be followed are completely different, and the performance changes refer to the performance of the leaked cable in the state of each slot. The slot combinations include but are not limited to the following shapes, rectangular chute, rectangular vertical Slot, U-shaped transverse slot or slot

[0040] The above five different combinations of slot groups can be used to solve the problem of wasted field strength at the beginning of the leaked cable, to improve the performance of the communication end, to extend the longest coverage distance or to shorten the switching area, improve the switching effect, and improve Terminal signal-to-noise ratio, but in general, multiple methods are often used in combination. In general, this solution is of great significance for solving the problem of low signal-to-noise ratio at the end of the leaky cable, too long switching area, and extending the equipment coverage radius to increase the distance of the leaky cable.

[0041] By arranging the corresponding performance-graded leaky coaxial cable, the link loss diagram shown in FIG. 2 and FIG. 3 is obtained; under the premise of ensuring that the beginning of the leaky cable link meets the communication requirements and that the comprehensive loss at the end is unchanged, The front-end section of the communication link established by the cable sacrifice certain radiation performance to ensure a small transmission loss, and sacrifice an appropriate amount of transmission loss at the end section to increase radiation performance, to avoid waste of field strength at the beginning and end, increase the signal-to-noise ratio of the end signal coverage area, and increase leakage The communication quality shortens the signal switching area and stabilizes the switching effect. On the basis of ensuring that the communication requirements of the front-end section of the leaked cable are met, it reduces the radiation ratio as much as possible to reduce transmission loss, save unnecessary energy loss of the front-end leaked cable, and ensure the premise of communication. The signal can be further extended to improve the coverage radius of the device. [0042] The specific embodiments of the present invention have been described in detail above, but the content is only the preferred embodiments created by the present invention, and cannot be considered to limit the implementation scope of the invention creation. All equal changes and improvements made in accordance with the scope of the present invention shall still fall within the scope of this patent.

Claims

Claim

[Claim 1] A leaky coaxial cable with gradual performance, characterized in that: at least two different sets of slot holes are arranged on the outer conductor of the same continuously produced leaky cable, and each set of slot holes The slots in the group are arranged in sequence along the same radial area position of the length of the leaky cable. When different slot groups exist separately, they must support the corresponding target frequency bands. There are performance differences in the corresponding target frequency bands.

[Claim 2] A leaky coaxial cable with gradual performance according to claim i, characterized in that: when the leaky cable itself is not cut, the outer conductor of the leaky cable is opened according to the site where the leaky cable is to be arranged. The slot method is designed in lengthwise segments. According to the characteristics of each length area, a corresponding slot hole group is opened on the outer conductor of the corresponding length area to ensure that it is still a leaky cable physically.

[Claim 3] The leaky coaxial cable with gradual performance according to claim 2, characterized in that: for leaky cables in different length regions, different slot groups need to be arranged according to different performance requirements.

[Claim 4] The leaky coaxial cable with gradual performance according to claim 1, characterized in that: when different slot groups exist separately, the main polarization mode is the same, that is, if one of the combined slot groups has one The radiated signals of the slot group are mainly vertical polarization, so all slot groups combined with it need to be mainly vertical polarization when the leakage cable is opened separately.

[Claim 5] The leaky coaxial cable with gradual performance according to claim 1, characterized in that the slot parameters of different slot groups are not completely the same, and the slot parameters specifically include but Not limited to slot hole shape, gradient pitch, slot width, slot length, slotting inclination angle, slot pitch, slot hole shape combination style.

[Claim 6] The leaky coaxial cable with gradual performance according to claim 1, characterized in that the slot group includes, but is not limited to, a U-shaped slotted combination, a figure-eight slotted combination or a flat Type slotted combination.

[Claim 7] The leaky coaxial cable with gradual performance according to claim 5, characterized in that: the combination of different slot groups includes at least one of the following slot parameters, different pitch combinations, and different slots Long combination, different slot width combination, different inclination angle combination, different slot shape combination.

[Claim 8] The leaky coaxial cable with gradual performance according to claim 7, wherein: Slot hole parameters of the same slot hole group during combination include, but are not limited to, any combination in any of the five ways in claim 8.

[Claim 9] The leaky coaxial cable with gradual performance according to claim 7, characterized in that the groove shape includes, but is not limited to, the following shapes, a rectangular inclined groove, a rectangular vertical groove, a U-shaped transverse groove or Slit slot.