WO2022165909A1

WO2022165909A1 - Radiation-enhanced leaky coaxial cable

Info

Publication number: WO2022165909A1
Application number: PCT/CN2021/079559
Authority: WO
Inventors: 刘中华; 宋海燕; 金惠义; 吕岑佳; 蒋鹏良; 卫伟; 周祎; 徐学孜; 袁纯钢; 孙鹏
Original assignee: 江苏亨鑫科技有限公司
Priority date: 2021-02-03
Filing date: 2021-03-08
Publication date: 2022-08-11
Also published as: CN112803169A; DE112021000107T5

Abstract

Provided is a radiation-enhanced leaky coaxial cable, comprising an inner conductor, an insulating layer, an outer conductor and a sheath, which are sequentially arranged from the center to an outer ring surface; the outer conductor is provided with a special slot; the special slot comprises at least two rows of slot groups, which are distributed at different angles in the circumferential direction of the outer conductor; each row of the slot groups comprises several slot arrays, which are periodically and repeatedly arranged at a fixed pitch in the axial direction of the outer conductor; each slot array comprises several slots; the pitches of all rows of the slot groups are the same; the slot groups comprise at least a row of main radiation slot groups and a row of main guide slot groups; and the main guide slot groups are ahead of the main radiation slot groups by a quarter of a pitch in a signal transmission direction. In the present invention, by arranging the main radiation slot groups and the main guide slot groups at a distance of a quarter of a pitch, the amount of main radiation in a main radiation direction can be amplified, thereby enhancing the radiation performance of a leaky cable in a usage frequency band, and causing the leaky cable to have stronger scenario adaptability.

Description

A radiation-enhanced leaky coaxial cable

technical field

The invention relates to a leaky coaxial cable design technology, in particular to a radiation-enhanced leaky coaxial cable.

Background technique

With the development of leaky coaxial cable technology, leaky cables are becoming more and more diverse like antennas, and their application fields are also expanding. In 5G indoor coverage, industrial Internet of Things and other fields, wireless coverage leaky cable solutions The uniform radiation, high stability and reliability are more and more favored by people.

For some specific industrial scenarios (such as key coverage scenarios, wireless sensor systems, etc.), high received power is required to trigger sensing conditions, and the radiation amount of leaky cables is very high, which is difficult to achieve with conventional leaky cable designs; However, some key coverage scenarios have high requirements on the radiation of leaky cables. The traditional method of increasing the radiation by changing the parameters of the outer conductor slot of the leaky cable often has great limitations and can only be used for certain specific frequency bands. For optimization, it is impossible to enhance the full-frequency radiation performance or to achieve the same degree of enhancement of the full-frequency radiation performance.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a radiation-enhanced leaky coaxial cable, which can conveniently and effectively enhance the main radiation amount in the main radiation direction, and is especially suitable for scenarios with high radiation requirements for leaky cables.

A brief summary of one or more aspects is presented below to provide a basic understanding of the aspects. This summary is not an exhaustive overview of all contemplated aspects and is neither intended to identify key or critical elements of all aspects nor attempt to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to an aspect of the present invention, a radiation-enhanced leaky coaxial cable is provided, comprising an inner conductor, an insulating layer, an outer conductor and a sheath sequentially arranged from the center to the outer annular surface, and the outer conductor is provided with a special groove The special slot hole includes at least two rows of slot hole groups, the at least two rows of slot hole groups are evenly distributed in the circumferential direction of the outer conductor, and each row of the slot hole group includes several slot hole arrays, so The slot arrays are periodically and repeatedly arranged at a fixed pitch along the axial direction of the outer conductor, each slot array includes a plurality of slot holes, and the pitch of the slot groups in each row is the same. There is at least one row of the main radiation slot group and at least one row of the main guide slot group, the main guide slot group leading the main radiation slot group by a quarter pitch along the signal transmission direction.

In an embodiment, the main guide slot group of the radiation-enhanced leaky coaxial cable has the same slot parameter settings as the main radiation slot group.

In one embodiment, the relationship between the angle α between the main guide groove group and the main radiation groove group of the radiation-enhanced leaky coaxial cable in the circumferential direction of the leaky cable and the total number of slot groups n is, α=360 °/n.

In one embodiment, the relationship between the distance D of the slot hole group on the expanded outer conductor of the radiation-enhanced leaky coaxial cable and the insulation of the outer diameter D of the _insulating layer is: D=π*D _insulation /n .

In one embodiment, the main guide groove group and the main radiation groove group of the radiation-enhanced leaky coaxial cable are respectively provided with 1 to 3 rows.

In one embodiment, when the specially made slot holes of the radiation-enhanced leaky coaxial cable include 3 rows of slot hole groups, the slot hole group in the middle position coincides with the center line of the narrow side of the outer conductor.

In one embodiment, the special slot hole of the radiation-enhanced leaky coaxial cable includes 1 row of main radiation slot groups, and 1 row or 2 rows of main guide slot groups.

In one embodiment, the special slot hole of the radiation-enhanced leaky coaxial cable includes 1 row of main radiation slot groups and 2 rows of main guide slot groups, between the main radiation slot group and the main guide slot group. The included angle in the circumferential direction of the leaky cable is 120 degrees.

In one embodiment, the special slot hole of the radiation-enhanced leaky coaxial cable includes 1 row of main radiation slot group and 1 row of main guide slot group, between the main radiation slot group and the main guide slot group The included angle in the circumferential direction of the leaky cable is 180 degrees.

The beneficial effect of the embodiment of the present invention is: by arranging at least one row of main radiating slot groups and at least one row of main guiding slot groups in the circumferential direction of the leaky cable, and setting the main radiating slot group and the main guiding slot group to be a quarter of a difference The pitch can enhance the main radiation amount in the main radiation direction, thereby enhancing the radiation performance of the leaky cable in the operating frequency band, while retaining the characteristics of the leaky cable with low loss and broadband uniform radiation, which can be used to solve the problem of the leaky cable in some scenarios. The problem of weak radiation performance makes the leaky cable more adaptable to the scene.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

The above-described features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale and components with similar related characteristics or features may have the same or similar reference numbers.

1 is a side view of an embodiment of the present invention;

Figure 2 is a side view of an embodiment of the present invention (outer conductor unfolded);

3 is a schematic diagram of the development of an outer conductor according to an embodiment of the present invention (the slot is a character-eight slot);

Fig. 4 is the corresponding cross-sectional schematic diagram of Fig. 3;

5 is a schematic diagram of the development of an outer conductor according to another embodiment of the present invention (the slot is a character-eight slot);

6 is a schematic diagram of the development of the outer conductor according to the embodiment of the present invention (the slot is a U-shaped slot);

7 is a schematic diagram of the development of the outer conductor according to the embodiment of the present invention (the slot is a slot);

Among them: 1-inner conductor; 2-insulation layer; 3-outer conductor; 4-sheath; 31-slot hole group; 31a-main radiation slot group; 31b-main guide slot group; 32-slot hole array; 33- Slotted hole; 34-center line; 35-stacked edge.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary, and should not be construed as any limitation to the protection scope of the present invention.

As shown in FIG. 1 and FIG. 2 , an embodiment of the present invention provides a radiation-enhanced leaky coaxial cable, including an inner conductor 1 , an insulating layer 2 , an outer conductor 3 and a sheath 4 that are sequentially arranged from the center to the outer annular surface . The outer conductor 3 is provided with a special slot hole, and the special slot hole includes at least two rows of slot hole groups 31. These slot hole groups 31 are evenly distributed in the circumferential direction of the outer conductor 3, in other words, the clips between these slot hole groups 31. Angles are equal.

Each row of slot groups 31 includes a plurality of slot arrays 32 periodically arranged along the axial direction of the outer conductor 3 . The pitch of each row of slot groups 31 is the same. In the slot group 31, at least one row is the main radiation slot group 31a, and at least one row is the main guide slot group 31b; the main guide slot group 31b is ahead of the main radiation slot along the signal transmission direction. Group 31a quarter pitch P.

By arranging at least one row of main radiating slot groups 31a and at least one row of main guide slot groups 31b in the circumferential direction of the leaky cable, and setting the main radiating slot group 31a and the main guide slot group 31b to differ by a quarter pitch, it is possible to make The phase difference of the excitation electric field of the main radiation slot group 31a and the main guide slot group 31b is close to 90°, thereby enhancing the main radiation amount in the main radiation direction, and enhancing the radiation performance of the leaky cable in the use frequency band, while retaining the low leakage cable. It can be used to solve the problem that the radiation performance of the leaky cable is too weak in some scenarios, so that the leaky cable has stronger scene adaptability.

The parameters of the slot holes 33 of the main guide slot group 31b and the main radiation slot group 31a can be inconsistent, but if the parameters of the slot holes 33 of the main guide slot group 31b and the main radiation slot group 31a are set the same, the radiation amount of the leaky cable can be doubled.

The relationship between the angle α between the main guide groove group 31b and the main radiation groove group 31a in the circumferential direction of the leaky cable and the total number of slot groups n is α=360°/n. The relationship between the spacing D of the slot group 31 on the expanded outer conductor 3 and the outer diameter D _insulation of the insulating layer is: D=π*D _insulation /n. During processing, slot groups 31 may be formed on the expanded outer conductor 3 with a pitch D. It should be noted that, the distance D and the included angle α in this application are both calculated based on the geometric center of the slot hole 33 .

Usually, the main guide groove group 31b and the main radiation groove group 31a can be respectively provided in 1-2 rows. When there are two rows of main radiation slot groups 31a, the two rows of main radiation slot groups 31a should be arranged adjacent to each other. Since the pitch and phase of the two rows of main radiation slot groups 31a are the same, the electric fields are superimposed on each other, so that the radiation lobe width is wider. The main guide groove groups 31b are arranged outside the two rows of the main radiation groove groups 31a, so that the effects of wide radiation lobes and strong radiation performance can be obtained. However, it should be noted that when the number of slot group columns is n=3, the slot hole group 31 in the middle position should be centrally arranged. As shown in FIG. 3, the slot hole group 31 in the middle position and the center line of the narrow side of the outer conductor 34 overlap, so that when the outer conductor is longitudinally wrapped, the overlapping edge 35 will not block the slot 33 .

Preferably, the special slot holes include 1 row of main radiating slot groups, 1 row or 2 rows of main guide slot groups. For example: as shown in Fig. 3, for 13/8" inch leaky cable, 2 columns of main guide grooves 31b and 1 column of main radiation grooves 31a can be set. For outer conductor 3, the spacing of the slotted holes D=π*19.2mm/3≈44.8mm. When wrapping on the leaky cable, the angle α between the main guide slot 31b and the main radiation slot 31a is about 120° ,As shown in Figure 4.

Also as shown in FIG. 5 , one row of main guide grooves 31b and one row of main radiation grooves 31a are provided, each row adopts a figure-eight slotting method, and a copper strip with a width of 148mm is used as the outer conductor 3, and slotted holes are made. The distance D=π*19.2mm/2≈67.2mm, when wrapping on the leaky cable, the angle between the main guide slot 31b and the main radiation slot 31a is about 180°.

It is easy to understand that the slot hole 33 can be a current mainstream slot, a character slot or a U-shaped slot, and can also be other such as an L-shaped slot, a T-shaped slot, an E-shaped slot or a triangular slot, which is not limited here. FIG. 6 shows the arrangement when the slot holes 33 are in-line slots, and FIG. 7 shows the arrangement when the slot holes 33 are U-shaped slots.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The previous description of the present disclosure is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above descriptions are only preferred examples of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection of this application. within the range.

Claims

A radiation-enhanced leaky coaxial cable, comprising an inner conductor, an insulating layer, an outer conductor and a sheath sequentially arranged from the center to the outer ring surface, characterized in that: the outer conductor is provided with a special slot hole, and the specially made The slot hole includes at least two rows of slot hole groups, the at least two rows of slot hole groups are evenly distributed in the circumferential direction of the outer conductor, and each row of the slot hole group includes a number of slot hole arrays, the slot hole arrays are along the The outer conductors are periodically and repeatedly arranged at a fixed pitch in the axial direction. Each slot hole array includes a plurality of slot holes, the pitch of each row of the slot hole groups is the same, and at least one row of the slot hole groups is the main one. The radiation slot group has at least one row of the main guide slot group, and the main guide slot group is ahead of the main radiation slot group by a quarter pitch along the signal transmission direction.
The multi-directional radiation leaky coaxial cable according to claim 1, wherein the parameters of the slot holes of the main guide slot group and the main radiation slot group are set consistent.
The multi-directional radiation leaky coaxial cable according to claim 1, characterized in that: the relationship between the angle α of the main guide groove group and the main radiation groove group in the circumferential direction of the leaky cable and the total number of slot hole groups n is: : α=360°/n.
The multi-directional radiation leakage coaxial cable according to claim 3, wherein the relationship between the distance D of the slot group on the expanded outer conductor and the insulation of the outer diameter D of the insulating layer is: D=π* D insulation /n.
The multi-directional radiation leakage coaxial cable according to claim 1, wherein the main guide groove group and the main radiation groove group are respectively provided with 1-2 rows.
The multi-directional radiation leakage coaxial cable according to claim 5, characterized in that: when the special slotted hole includes 3 rows of slotted hole groups, the slotted hole group in the middle position coincides with the center line of the narrow side of the outer conductor .
The multi-directional radiation leaky coaxial cable according to claim 5, wherein the specially-made slot holes comprise one row of main radiation slot groups and one row or two rows of main guide slot groups.
The multi-directional radiation leaky coaxial cable according to claim 7, wherein the special slot hole comprises one row of main radiation slot groups and two rows of main guide slot groups, the main radiation slot group and the main guide slot group The included angle between the groove groups in the circumferential direction of the leaky cable is 120 degrees.
The multi-directional radiation leakage coaxial cable according to claim 7, wherein the special slot hole comprises a main radiation slot group and a main guide slot group, the main radiation slot group and the main guide slot group The included angle between the groove groups in the circumferential direction of the leaky cable is 180 degrees.