CN115458889B

CN115458889B - Promote leaky cable of MIMO function

Info

Publication number: CN115458889B
Application number: CN202211150627.6A
Authority: CN
Inventors: 查昊; 杨军; 李俊达; 王耀民; 李昀
Original assignee: China Information Consulting and Designing Institute Co Ltd
Current assignee: China Information Consulting and Designing Institute Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-07-28
Anticipated expiration: 2042-09-21
Also published as: CN115458889A

Abstract

The invention discloses a leakage cable for improving MIMO (multiple input multiple output) function, which comprises a leakage cable body, wherein the leakage cable body comprises a first leakage cable and a second leakage cable, the first leakage cable comprises an inner conductor, an insulating medium and a first outer conductor from inside to outside, an inclined slot hole unit is arranged on the first outer conductor, the inclined slot hole unit comprises more than two inclined slot hole groups, the inclined slot hole groups are vertically arranged, and each inclined slot hole group comprises more than one splayed slot hole; the second leakage cable sequentially comprises an inner conductor, an insulating medium and a second outer conductor from inside to outside, wherein a fork-shaped slot hole unit is arranged on the second outer conductor and comprises more than two fork-shaped slot hole groups, the fork-shaped slot hole groups are vertically arranged, and each fork-shaped slot hole group is centrally symmetrical and comprises more than two fork-shaped slot holes. The leaky cable creatively improves the slotted hole form of the combined leaky cable, improves the coupling loss so as to further improve the communication quality, realizes more uniform spatial field distribution and increases the radiation area.

Description

Promote leaky cable of MIMO function

Technical Field

The invention belongs to the technical field of mobile communication, and particularly relates to a leaky cable for improving MIMO (multiple input multiple output) functions.

Background

The leaky cable integrates signal transmission, transmitting and receiving functions, has the dual functions of a coaxial cable and an antenna, and is mainly suitable for covering long and narrow area scenes such as tunnels, roadways, subways and the like. When the 5G era is entered, the 5G terminal is mainly 1T4R and 2T4R, and at least more than 2T/R radio frequency medium needs to be deployed on the network side at this time, so that capacity and coverage improvement brought by 5G can be fully reflected, and the prior art mainly has two types: the type a mode utilizes a single leaky cable to construct multipath effect, the mode is that radio frequency signals are fed in from the forward end and the reverse end of the same leaky cable at the same time, and because two paths of signals are opposite in radiation and have lower correlation in the transmission path inside the leaky cable, the characteristic of MIMO (multiple-in multiple-out) can be realized, but the implementation of the method has two necessary conditions, firstly, two paths of fed signals have to be in the same cell (certain requirement on information source equipment), and additionally, paved scenes need to be in a rich scattering state. Therefore, the method is greatly discounted in the practicability and the universality of the scene; the B type mode adopts a plurality of leaky cables to combine to realize the MIMO characteristic, and the method has the advantages that too much consideration is not needed for equipment and implementation, the requirements on wireless environment are not needed to be strict, different polarizations are realized by adopting different slotting modes under different environments, and better MIMO characteristics can be obtained in the same polarization and cross polarization modes. In addition, in order to expand the application scene of the leaky cable (for example, building type scene), a C-type wide-angle leaky cable is also developed, and the radial radiation distance and performance of the slotted hole design of the leaky cable are improved to be more than those of the common leaky cable, so that the width of the application scene of the leaky cable is enhanced. Class C is also a single cable mode, and it is more difficult to implement MIMO in building type scenes by class A, and all the above-mentioned class 3 modes face several common problems: the cable has no universality, when the radiation of the lower cable is directional, the radiation area is narrower, if the bidirectional radiation is to be realized, the construction process of the leaky cable is high, and the covering effect is not influenced in place by installation, so that the cable has higher requirements on the technical level of implementation personnel.

Disclosure of Invention

The invention aims to: the invention aims to solve the technical problem of providing a leaky cable for improving the MIMO function aiming at the defects of the prior art.

In order to solve the technical problems, the invention discloses a leaky cable for improving the MIMO function, which comprises a leaky cable body and a sheath layer for wrapping the leaky cable body, wherein the leaky cable body comprises a first leaky cable and a second leaky cable, the first leaky cable sequentially comprises an inner conductor, an insulating medium and a first outer conductor from inside to outside, an inclined slotted hole unit is arranged on the first outer conductor and is used for realizing vertical polarization, the inclined slotted hole unit comprises more than two inclined slotted hole groups, the inclined slotted hole groups are vertically arranged, and each inclined slotted hole group comprises more than one group of splayed slotted holes; the second leakage cable sequentially comprises an inner conductor, an insulating medium and a second outer conductor from inside to outside, wherein a fork-shaped slot hole unit is arranged on the second outer conductor and used for realizing horizontal polarization, the second leakage cable comprises more than two fork-shaped slot hole groups, the fork-shaped slot hole groups are vertically arranged, and each fork-shaped slot hole group is centrally symmetrical and comprises more than two fork-shaped slot holes.

Further, oblique slot units are alternately arranged on the two sides of the first outer conductor, fork-shaped slot units are alternately arranged on the two sides of the second outer conductor, and the pitch of the two oblique slot units is the same as the pitch of the two fork-shaped slot units and is denoted as P.

Further, the fork slot unit includes two fork slot groups vertically arranged, each fork slot group includes six fork slots, which are respectively marked as a first fork slot, a second fork slot, a third fork slot, a fourth fork slot, a fifth fork slot and a sixth fork slot, the first to third fork slot are on the same horizontal line, the fourth to sixth fork slots are on another same horizontal line, and the distance between the two horizontal lines is d1 _x The method comprises the steps of carrying out a first treatment on the surface of the The distance between two fork-shaped slotted hole groups is d2 _x The total length of the two rows of fork-shaped slotted holes is L _x The method comprises the steps of carrying out a first treatment on the surface of the The inclination angle of the fork-shaped slotted hole is theta _x Width w _x 。

Further, the inclined slot unit includes two inclined slot groups, the two inclined slot groups are vertically arranged, each inclined slot group includes three groups of splayed slots, which are marked as a first splayed slot, a second splayed slot and a third splayed slot, the first splayed slot includes a first inclined slot and a second inclined slot, the second splayed slot includes a third inclined slot and a fourth inclined slot, the third splayed slot includes a fifth inclined slot and a sixth inclined slot, and the inclination angles of the two inclined slots in each group of splayed slots are respectively θ _o And 180 DEG to theta _o ，θ _o The width of each inclined slot hole is w, and the inclined slot hole is an included angle between the inclined slot hole and the axial direction of the leakage cable _o The vertical distance between two inclined slots is d1 _o The method comprises the steps of carrying out a first treatment on the surface of the Each inclined slot group is sequentially provided with a first inclined slot, a third inclined slot, a fifth inclined slot, a sixth inclined slot, a fourth inclined slot and a second inclined slot; the distance between the two inclined slot groups is d2 _o The total length of the two rows of inclined slotted holes is L _o 。

Further, the inclination angle θ of the fork slot _x Angle of inclination θ with one of the splayed slots _o And the same value is set as theta, and the value range of theta is 26-34 degrees.

Further, the distance d1 in the fork slot group _x Vertical distance d1 between two inclined slots of each splayed slot group _o The value range of d1 is 2-4 mm.

Further, the distance d2 between two fork slot sets _x Distance d2 from two inclined slot groups _o The same is set as d2, and the value range of d2 is 2-4 mm.

Further, the total length L of the two rows of fork-shaped slotted holes _x And the total length L of two rows of inclined slotted holes _o The value range of L is 25-33 mm.

Further, the pitch P is 210-250 mm in value.

Further, width w of fork slot _x Width w of inclined slot _o And the value range of w is 3-5 mm.

The beneficial effects are that: the utility model provides a promote leaky cable of MIMO function improves the slotted hole form of merging leaky cable creatively, including slotted hole shape, size, range, angle, not only has the characteristic of C class, and realizes that the general scene is suitable for MIMO characteristic, improves coupling loss and makes communication quality further improve. The double-sided slotting mode enables the directional coverage of the cable to be changed into bidirectional (approximately omni-directional) coverage, so that more uniform spatial field distribution is realized, the radiation area is increased, and the requirement of more potential scenes (for example, the leaky cable vertically covers the opposite building scene) is met. The technical requirements of constructors are reduced, and the labor cost is reduced; combining leaky cables also reduces CAPEX (Capital Expenditure ) costs, saves installation space, reduces installation difficulty, and in turn reduces overall TCO (Total Cost of Ownership ).

Drawings

The foregoing and/or other advantages of the invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings and detailed description.

Fig. 1 is a schematic structural diagram of a leaky cable for improving MIMO function according to an embodiment of the present application.

Fig. 2 is an exploded schematic view of an outer conductor current line of a tilt slotted leaky cable in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 3 is an exploded schematic view of a vertical symmetrical slot outer conductor current line in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 4 is a schematic diagram of an inclined slot design on a first outer conductor in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 5 is a schematic diagram of staggered arrangement of first outer conductor copper strips in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 6 is a schematic diagram of superposition of a fork slot radiation field on a second outer conductor in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 7 is a schematic diagram of a design of a fork slot hole on a second outer conductor in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 8 is a schematic diagram of staggered layout of spreading fork slots of a second outer conductor copper strip in a leaky cable for improving MIMO function according to an embodiment of the application.

Fig. 9 is a schematic diagram of an operating frequency band and a voltage standing wave ratio simulation result of a leaky cable when a vertical distance d1=0 between two inclined slots of each splayed slot in an inclined slot group in the leaky cable for improving a MIMO function according to an embodiment of the application.

Fig. 10 is a schematic diagram of an operating frequency band and a voltage standing wave ratio simulation result of a leaky cable when a vertical distance d1=4mm between two inclined slots of each splayed slot in an inclined slot group in the leaky cable for improving a MIMO function according to an embodiment of the application.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The leaky cable for improving the MIMO function can be applied to closed long and narrow scenes with limited indoor installation space, such as subways, tunnels and mines, so that the MIMO characteristic is realized, and meanwhile, the leaky cable can also be applied to indoor building type scenes, such as corridor, single-double-sided office buildings and hotel hotels; compact shopping areas with simple material intervals such as glass, wood board or gypsum board; elongated underground parking garage; an elevator, realizing MIMO characteristics; and meanwhile, the cable can be vertically and horizontally laid outside to cover the opposite building, so that the MIMO characteristic can be realized.

MIMO technology is mainly divided into three categories: transmit diversity, spatial multiplexing, beamforming. For the 2T/R leaky cable mode, the transmission diversity and the spatial multiplexing technology can be mainly realized, and the transmission diversity and the spatial multiplexing use the weak correlation of the spatial channels to improve the reliability of signal transmission and the peak rate of data transmission. The space latitude of the combined leaky cable is not yet available, how to realize weak correlation can be realized through frequency, time and polarization modes, or the uncorrelation of channels can be realized through a wireless multipath environment, the polarization mode is one of better modes, and the homopolar polarization mode performance of the combined double cable is better than that of the combined double cable by adopting a cross polarization mode, because the antenna polarization modes are different, so that the reflection coefficients of the inner wall of a tunnel are different. Because the inner wall of the tunnel is made of conductor material and has high dielectric constant, the transmitting end can generate higher reflected waves in a homopolar mode, so that the power of the same-polarization mode is smaller than that of cross polarization, and the channel capacity is relatively higher. The precondition that the same polarization is higher than the cross polarization capacity is that in a tunnel with multipath environment, if the tunnel is not in the condition, the capacity improvement is only logarithmic, so that the tunnel has no universality, the difference of polarization modes is independent of environmental change, and the uncorrelation of channels is realized by a polarization orthogonal mode, so that the tunnel adapts to the universality environment.

The embodiment of the application discloses a leaky cable for improving a MIMO function, as shown in fig. 1, the leaky cable comprises a leaky cable body 100 and a sheath layer 200 wrapping the leaky cable body, the leaky cable body 100 comprises a first leaky cable 110 and a second leaky cable 120, the first leaky cable 110 sequentially comprises an inner conductor 3, an insulating medium 4 and a first outer conductor 111 from inside to outside, as shown in fig. 5, an inclined slot hole unit 112 is arranged on the first outer conductor 111, the inclined slot hole unit 112 is used for realizing vertical polarization, the inclined slot hole unit comprises more than two inclined slot hole groups 113, the inclined slot hole groups 113 are vertically arranged, and each inclined slot hole group 113 comprises more than one splayed slot hole; the second leaky cable 120 sequentially includes an inner conductor, an insulating medium, and a second outer conductor 121 from inside to outside, as shown in fig. 8, a fork slot unit 122 is provided on the second outer conductor 121, the fork slot unit 122 is used for realizing horizontal polarization, and includes more than two fork slot groups 123, the fork slot groups 123 are vertically arranged, and each fork slot group 123 is centrally symmetrical and includes more than two fork slots.

Orthogonal is achieved because electromagnetic waves with vertical polarization and electromagnetic waves with horizontal polarization do not interfere with each other, and MIMO characteristics are presented.

In this embodiment, as shown in fig. 5, the first outer conductor 111 is provided with oblique slot units 112 in a double-sided staggered manner, as shown in fig. 8, the second outer conductor 121 is provided with fork-shaped slot units 122 in a double-sided staggered manner, and the pitch of the two oblique slot units 112 is the same as the pitch of the two fork-shaped slot units 122, denoted as P.

In order to realize more scene coverage, the embodiment adopts a double-sided slotting mode, and because the cable outer conductor copper strip adopts a longitudinal wrapping lap joint mode, double-sided symmetrical slotting is difficult to realize in the process, and the embodiment adopts a staggered arrangement mode. Under the condition of single-mode radiation, the radiation direction of the leaky cable is mainly concentrated around the leaky cable, and the radiation angle theta of the leaky cable can be known according to the following formula (1) _m Mainly composed of pitch P, wavelength lambda, harmonic order m and dielectric constant epsilon _r To determine the degree of freedom of the device,

the selection frequency is 3.5GHz, the wavelength lambda=0.08 m, and the dielectric constant epsilon of the insulating medium of the copper cable _r At about 1.25, the pitch P is 240mm, and when the harmonic frequency m is less than or equal to-1, the leaky cable can work in the radiation mode, and the maximum radiation direction (radiation angle theta _m ) Near the 30 deg. direction of the slotted side.

Compared with a single-side slotted leaky cable, the double-side slotted leaky cable has a more symmetrical directional diagram, so that the problem of blind areas on the back of a slotted hole of the single-side slotted cable can be avoided, signals can be radiated more uniformly in space, the radiation area is increased, and the communication quality is improved.

In this embodiment, as shown in fig. 7 and 8, the fork slot unit 122 includes two fork slot groups 123, the two fork slot groups 123 are vertically arranged, each fork slot group 123 includes six fork slots, which are respectively denoted as a first fork slot 124, a second fork slot 125, a third fork slot 126, a fourth fork slot 127, a fifth fork slot 128, and a sixth fork slot 129, the first to third fork slots are on the same horizontal line, the fourth to sixth fork slots are on another same horizontal line, and the distance between the two horizontal lines is d1 _x The method comprises the steps of carrying out a first treatment on the surface of the The distance between the two fork slot sets 123 is d2 _x The total length of the two rows of fork-shaped slotted holes is L _x The method comprises the steps of carrying out a first treatment on the surface of the The inclination angle of the fork-shaped slotted hole is theta _x Width w _x 。

When the phase difference of the current lines passing through the two slots is zero or an integral multiple of 2 pi, the component directions of the radiation fields in the horizontal direction are the same, and the radiation fields are mutually overlapped; in the vertical direction, the directions of the radiation field components are opposite and offset, as shown in fig. 6, to make the phase difference of the current lines passing through the two slots be zero or an integer multiple of 2pi, the interval between the slots should satisfy that the interval is an integer multiple of the half wavelength of the operation, and when the interval between the two slots is 0, that is, the geometric centers of the two slots coincide, the condition that the phases of the current lines of the two slots are the same can be satisfied, so that horizontal polarization is realized.

In this embodiment, the inclined slot unit 112 includes two inclined slot groups 113, the two inclined slot groups 113 are vertically arranged, each inclined slot group 113 includes three groups of splayed slots, which are denoted as a first splayed slot 114 including a first inclined slot 114 and a second inclined slot 115, a second splayed slot including a third inclined slot 116 and a fourth inclined slot 117, and a third splayed slot including a fifth inclined slot 118 and a sixth inclined slot 119, and the inclination angles of the two inclined slots in each group of splayed slots are respectively θ _o And 180 DEG to theta _o The width is w _o The vertical distance between two inclined slots is d1 _o The method comprises the steps of carrying out a first treatment on the surface of the Each inclined slot group 113 is sequentially arranged with a first inclined slot 114, a third inclined slot 116, a fifth inclined slot 118, a sixth inclined slot 119, a fourth inclined slot 117, and a second inclined slot 115; the distance between the two inclined slot groups 113 is d2 _o The total length of the two rows of inclined slotted holes is L _o 。

Each fork slot set 123 includes six fork slots and each inclined slot set 113 includes three splayed slots to spread the leaky cable over a wider frequency band while suppressing higher harmonics. Table 1 shows the relation between the number of slotted groups and the expansion multiple of the frequency band in the embodiment of the present application, as shown in table 1, as the number of slotted groups increases, the expansion multiple of the frequency band of the leaky cable also increases, if the number of slots is too large, the slot distance is too close, so that the electromagnetic coupling phenomenon is serious, and thus the energy transmission in the leaky cable communication process is also affected, so that the leaky cable with the slot number of 3 is selected in this embodiment.

TABLE 1 relation of slotted group number and band expansion multiple

Number of grooving groups in one period (pitch P)	Frequency band expansion number
		1	2
2	4
		3	6
4	8

In the present embodiment, the inclination angle θ of the fork slot _x Angle of inclination θ with one of the splayed slots _o And the same value is set as theta, and the value range of theta is 26-34 degrees.

The first outer conductor 111 employs an inclined slot, and the current flowing through the inclined slot can be decomposed into two components parallel to the slot and perpendicular to the slot, as shown in fig. 2 and 3, when the width of the slot is sufficiently small as shown in fig. 2 (a) and 3 (a), the displacement current generated by cutting the current line component parallel to the slot by the slot can be ignored, that is, radiation can not be generated, while the current component perpendicular to the slot shown in fig. 2 (b) and 3 (b) is cut by the slot, generating a larger displacement current, radiating electromagnetic energy, the component of the current line perpendicular to the slot can be divided into a horizontal component and a vertical component, the horizontal component current generates a field strength in the Z direction, the current of the vertical component generates a field strength in the circumferential direction, that is, phi, and based on the above analysis, for the inclined slotted leaky cable, the horizontal component is suppressed, while the circumferential component is retained, so that the vertically polarized leaky cable can be achieved. Therefore, as shown in fig. 4, the design of symmetrical slots (splayed slots) is adopted, and the current lines of the symmetrical slots are opposite in phase, so that the electric field vectors generated by the displacement currents of the slots are opposite in direction in the horizontal direction and are superimposed and cancelled; in the vertical direction, the directions are the same, and the overlapping and the adding are carried out; in the radial direction, the directions are opposite, and the superposition is cancelled. Thereby achieving the effect of vertically polarized radiation. Meanwhile, the inclination angle of the slot hole also affects the component sizes of the radiation field in the horizontal direction and the vertical direction, the inclination angle is increased to increase the component in the horizontal direction and reduce the component in the vertical direction, so that the purity of vertical polarization can be improved by properly reducing the angle of the slot hole, but the purity of vertical polarization can be improved by infinitely reducing the angle of the slot hole, and the coupling loss of a leaky cable can be increased, so that the radial radiation performance is reduced, and the inclination angle cannot be reduced very little. The second outer conductor 121 adopts a fork-shaped slot (X-shaped), which is also consistent with the splayed slot mode, the inclination angle of the slot still causes the components of the horizontal direction and the radiation field in the horizontal direction and the vertical direction to be different, and because the phase of the fork-shaped slot cable and the coincident current line of the slot are the same, the vertical component can be completely counteracted, the splayed slot can not completely counteract the horizontal component, so the angle dependence of the horizontal polarization purity on the slot is smaller, the inclination angle of the slot is improved, the horizontal component can be improved, and the inclination angle recommended value of the slot is consistent with that of the first outer conductor 111.

In the present embodiment, the distance d1 in the fork slot group 123 _x Vertical distance d1 between two inclined slots of each splayed slot of inclined slot group 113 _o The value range of d1 is 2-4 mm.

Unlike the reflection of common coaxial cable, the equivalent transmission line of the leaky cable is asymmetric, the impedance value distributed along the axis can change along with the different positions, each slotted hole on the outer conductor of the leaky cable can periodically reflect electromagnetic energy, and when the reflection between adjacent slotted holes meets certain conditions, resonance can be generated under the working frequency, so that the electromagnetic energy oscillates in the propagation process, and the communication is affected. In this embodiment, the slot is designed with consideration of the suppression of the resonance point, that is, the dislocation adjustment is performed on the slot with a three-splayed shape and the fork-shaped slot to achieve the suppression of the resonance point, and the inclined slot in half period is shifted by d1 in the X direction.

By using HFSS (High Frequency Structure Simulator, high-frequency structure simulation) electromagnetic simulation software to perform simulation analysis, setting the working frequency range of the electromagnetic simulation software to be 0 to 3500MHz, and carrying out frequency sweep by taking 500MHz as a step length to obtain the voltage standing wave ratio (VSWR, voltage Standing Wave Ratio) of the leaky cable, as shown in FIG. 9, it can be seen from FIG. 9 that the peak value of the voltage standing wave ratio of the leaky cable is 1.83 when the frequency is 500MHz, and the voltage standing wave ratio of the rest frequency points is less than 1.15. According to the electrical performance requirement of the communication industry standard YD/T2491-2013, the standing wave ratio is smaller than 1.30 under the condition of 500MHz, so that the position is a resonance point, the electromagnetic energy reflection is obvious, and the communication quality is influenced. In this embodiment, the slot is translated, the initial translation value d1=4mm, as shown in fig. 10, the working frequency range of the simulation process is still set to 0 to 3500MHz, and the frequency sweep is still performed with 500MHz as a step length, so as to achieve a cable leakage voltage standing wave, as shown in fig. 10, as can be seen from fig. 10, the voltage standing wave ratio of other working frequencies except for 0MHz is less than 1.30, the industry standard requirement is met, and the resonance point of the cable leakage of the tri-splayed slot at 1000MHz is obviously inhibited through dislocation adjustment, namely the cable leakage can normally work within the working frequency of 3500MHz, and the communication requirement is met.

In the present embodiment, the distance d2 between the two fork slot sets 123 _x Distance d2 from two inclined slot groups 113 _o The same is set as d2, and the value range of d2 is 2-4 mm.

In the present embodiment, the total length L of the two rows of fork slots _x And the total length L of two rows of inclined slotted holes _o The value range of L is 25-33 mm.

The first outer conductor 111 divides a single-row inclined slot hole group in the prior art into double-row inclined slot hole groups (a row and b row), the a row and the b row are symmetrically arranged, and the interval d2 between the a row and the b row is controlled to be 2-4 mm; the length of each split row of slot holes is smaller than 1/4 wavelength of the highest use frequency supported by the leaky cable, so that the deployment of 3.5G frequency can be satisfied, meanwhile, the length L of each split double-row slot hole is larger than the single-row length in the prior art, the current intercepted by the slot holes is increased, the electromagnetic energy radiated to the external space is increased, the coupling loss is correspondingly reduced, and the radial radiation performance is more excellent. The second outer conductor 121 also includes two fork slot sets 123, the spacing d2 and the length L are identical to those of the first outer conductor 111, and the overall length of the double row slot set is increased compared with that of a conventional single slot, so that the increase in length and the increase in the number of units after splitting can effectively expand the radiation angle and coverage uniformity of the leaky cable.

The slot pitch P also affects the coupling loss, and is affected by the phase superposition of the radiation fields of different slots, and the coupling loss becomes smaller when the slot pitch is increased, but when the slot pitch is increased to a certain value, the coupling loss becomes larger due to the reduction of electromagnetic energy radiated per unit length, so that in this embodiment, the range of the value of the pitch P is 210-250 mm.

In the present embodiment, the width w of the fork slot _x Width w of inclined slot _o And the value range of w is 3-5 mm.

When the width of the slot is increased, the result of the coupling loss is also improved, the slot width is increased, the horizontal current line is cut by the slot to generate displacement current, so that excitation is generated, electromagnetic waves are radiated to the space, and the effect is better.

The invention provides a leaky cable for improving the MIMO function, and the method and the way for realizing the technical scheme are numerous, the above description is only a specific embodiment of the invention, and it should be pointed out that a plurality of improvements and modifications can be made to those skilled in the art without departing from the principle of the invention, and the improvements and modifications are also considered as the protection scope of the invention. The components not explicitly described in this embodiment can be implemented by using the prior art.

Claims

1. The utility model provides a promote leaky cable of MIMO function, its characterized in that includes leaky cable body (100) and parcel leaky cable body's restrictive coating (200), leaky cable body (100) include first leaky cable (110) and second leaky cable (120), first leaky cable (110) are from inside to outside including inner conductor (3), insulating medium (4) and first outer conductor (111) in proper order, offer inclined slotted hole unit (112) on first outer conductor (111), inclined slotted hole unit (112) are used for realizing vertical polarization, include more than two inclined slotted hole group (113), inclined slotted hole group (113) are arranged perpendicularly, each inclined slotted hole group (113) include the splayed slotted hole of more than one group; the second leakage cable (120) sequentially comprises an inner conductor, an insulating medium and a second outer conductor (121) from inside to outside, wherein a fork-shaped slot hole unit (122) is arranged on the second outer conductor (121), the fork-shaped slot hole unit (122) is used for realizing horizontal polarization and comprises more than two fork-shaped slot hole groups (123), the fork-shaped slot hole groups (123) are vertically arranged, and each fork-shaped slot hole group (123) is centrally symmetrical and comprises more than two fork-shaped slot holes;

inclined slot hole units (112) are formed in the first outer conductor (111) in a double-sided staggered manner, fork-shaped slot hole units (122) are formed in the second outer conductor (121) in a double-sided staggered manner, and the pitch of the two inclined slot hole units (112) is the same as the pitch of the two fork-shaped slot hole units (122) and is denoted as P;

the fork-shaped slot unit (122) comprises two fork-shaped slot groups (123), the two fork-shaped slot groups (123) are vertically arranged, each fork-shaped slot group (123) comprises six fork-shaped slots which are respectively marked as a first fork-shaped slot (124), a second fork-shaped slot (125), a third fork-shaped slot (126), a fourth fork-shaped slot (127), a fifth fork-shaped slot (128) and a sixth fork-shaped slot (129), the first to third fork-shaped slots are on the same horizontal line, the fourth to sixth fork-shaped slots are on the other same horizontal line, and the distance between the two horizontal lines is d1 _x The method comprises the steps of carrying out a first treatment on the surface of the The distance between two fork-shaped slot groups (123) is d2 _x The total length of the two rows of fork-shaped slotted holes is L _x The method comprises the steps of carrying out a first treatment on the surface of the The inclination angle of the fork-shaped slotted hole is theta _x Width w _x ；

The inclined slot unit (112) comprises two inclined slot groups (113), the two inclined slot groups (113) are vertically arranged, each inclined slot group (113) comprises three groups of splayed slots, namely a first splayed slot, a second splayed slot and a third splayed slot, the first splayed slot comprises a first inclined slot (114) and a second inclined slot (115), the second splayed slot comprises a third inclined slot (116) and a fourth inclined slot (117), the third splayed slot comprises a fifth inclined slot (118) and a sixth inclined slot (119), and the inclination angles of the two inclined slots in each group of splayed slots are respectively theta _o And 180 DEG to theta _o The width is w _o The vertical distance between two inclined slots is d1 _o The method comprises the steps of carrying out a first treatment on the surface of the Each inclined slot group (113) is sequentially provided with a first inclined slot (114), a third inclined slot (116), a fifth inclined slot (118), a sixth inclined slot (119), a fourth inclined slot (117) and a second inclined slot (115)The method comprises the steps of carrying out a first treatment on the surface of the The distance between the two inclined slot groups (113) is d2 _o The total length of the two rows of inclined slotted holes is L _o 。

2. The leaky cable with improved MIMO function according to claim 1, wherein the angle of inclination θ of the fork slot _x Angle of inclination θ with one of the splayed slots _o And the same value is set as theta, and the value range of theta is 26-34 degrees.

3. A leaky cable for improving MIMO function according to claim 2, wherein the distance d1 in the fork slot group (123) _x Vertical distance d1 between two inclined slots of each splayed slot group (113) _o And the same is set as d1, and the value range of d1 is 2-4 mm.

4. A leaky cable for improving MIMO function according to claim 3, wherein the distance d2 between two fork slot groups (123) _x Distance d2 from two inclined slot groups (113) _o And the same is set as d2, and the value range of d2 is 2-4 mm.

5. The leaky cable with improved MIMO function as claimed in claim 4, wherein the total length L of two rows of fork slots _x And the total length L of two rows of inclined slotted holes _o The same is set as L, and the value range of the L is 25-33 mm.

6. The leaky cable with the function of improving MIMO according to claim 5, wherein the pitch P is 210-250 mm.

7. The leaky cable with improved MIMO function as claimed in claim 6, wherein width w of the fork slot _x Width w of inclined slot _o The value range of w is 3-5 mm.