CN111293393A - Fusion type leaky cable and coverage system - Google Patents

Abstract

A fusion type leaky cable comprises at least one leaky coaxial cable and at least one leaky waveguide, wherein the leaky coaxial cable and the leaky waveguide form an integrated structure, and the distance between the leaky coaxial cable and the leaky waveguide is 0-20 mm. The leaky coaxial cable and the leaky waveguide are integrated, the lower frequency band is transmitted in the leaky coaxial cable, and the higher frequency band is transmitted in the leaky waveguide, so that the use frequency band of the leaky cable is expanded to a high frequency and has higher compatibility.

Description

Fusion type leaky cable and coverage system

Technical Field

The invention relates to the technical field of communication, in particular to a fusion type leaky cable capable of being used for long-distance transmission or radiation of microwave signals and a covering system using the fusion type leaky cable.

Background

At present, the leaky coaxial cable is widely applied to the environments with poor wireless signal coverage such as railways, tunnels, mines, buildings and the like, has the transmission characteristic of a transmission line and the radiation characteristic of an antenna, and can overcome the problem of strong underground electromagnetic interference, thereby improving the communication quality. With the rapid development of 5G construction, the use frequency band is higher and higher. The power capacity is reduced due to the structural limitation of the coaxial cable, the loss of the inner conductor of the leaky coaxial cable and the loss of the filling medium of the leaky coaxial cable are correspondingly increased, and the transmission loss of the leaky coaxial cable is increased. Meanwhile, in order to adapt to a higher use frequency band, the structural size of the leaky coaxial cable needs to be reduced, and the transmission loss of the leaky coaxial cable is further increased. Therefore, leaky coaxial cables are not suitable for high frequency long distance communications.

The leaky waveguide has better transmission performance at high frequency, and can be applied to higher frequency band transmission. But the frequency compatibility is poor, the low, medium and high frequency communication frequency band signals cannot be compatible at the same time, the structure size is large, the construction and installation difficulty is large, a large installation space is needed, and the installation and construction cost is high.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a fused leaky cable and a coverage system using the same, in which a leaky coaxial cable and a leaky waveguide are integrated, a lower frequency band is transmitted in the leaky coaxial cable, and a higher frequency band is transmitted in the leaky waveguide, so that the frequency band of the leaky cable is expanded to a high frequency band and has higher compatibility.

In order to achieve the purpose, the invention adopts the technical scheme that:

a fusion type leaky cable comprises at least one leaky coaxial cable and at least one leaky waveguide, wherein the leaky coaxial cable and the leaky waveguide form an integrated structure, and the leaky coaxial cable and the leaky waveguide are arranged at a distance of 0-20 mm.

Preferably, the leakage coaxial cable further comprises an outer sheath and a filling layer, the outer sheath is wrapped outside the leakage coaxial cable and the leakage waveguide, at least one back rib for position indication is arranged on the outer side wall of the outer sheath in a protruding mode, and the filling layer is arranged between the outer sheath and the leakage coaxial cable and between the outer sheath and the leakage waveguide.

Preferably, the filling layer is filled with one of filling materials of a filling rope, a filling rod or a sheath.

Preferably, the leaky coaxial cable comprises an inner conductor, an outer conductor and a first insulating filling layer, the inner conductor is arranged inside the outer conductor, the first insulating filling layer is arranged between the inner conductor and the outer conductor, the leaky waveguide comprises a waveguide conductor and a second insulating filling layer, the second insulating filling layer is arranged inside the waveguide conductor, the leaky coaxial cable is in tangential abutting contact with the outer part of the leaky waveguide, namely the outer side wall of the waveguide conductor is in tangential abutting contact with the outer side wall of the outer conductor, and the filling layer is arranged in a gap between the waveguide conductor and the outer conductor to the outer sheath.

Preferably, the waveguide conductor and the outer conductor are both provided with leakage slot holes along the axial direction thereof, the leakage slot holes are one or more of oval holes, rectangular holes, splayed inclined holes, splitting holes, L-shaped holes, U-shaped holes, E-shaped holes, T-shaped holes, triangular holes and polygonal holes, and the leakage slot holes on the outer conductor and the leakage slot holes on the waveguide conductor are both arranged back to the back rib.

Preferably, the leaky waveguide is one of a leaky circular waveguide, a leaky elliptical waveguide, a leaky rectangular waveguide, a leaky semicircular waveguide, a leaky semi-elliptical waveguide, a leaky ridge waveguide and a leaky special-shaped waveguide, and the leaky coaxial cable is circular or square in shape.

Preferably, the leaky coaxial cable includes an inner conductor, an outer conductor, and a first insulating filling layer, the inner conductor is disposed inside the outer conductor, and the first insulating filling layer is disposed between the inner conductor and the outer conductor, the leaky waveguide includes a waveguide conductor and a second insulating filling layer, the second insulating filling layer is disposed inside the waveguide conductor, the leaky coaxial cable and the leaky waveguide are disposed in an intersecting manner, that is, the outer conductor and the waveguide conductor are disposed in an intersecting manner, and the filling layers are disposed between the waveguide conductor and the outer sheath.

Preferably, the waveguide conductor and the outer conductor are provided with leakage slot holes along the axial direction thereof, the leakage slot holes are one or more of elliptical holes, rectangular holes, splayed inclined holes, split holes, L-shaped holes, U-shaped holes, E-shaped holes, T-shaped holes, triangular holes and polygonal holes, and the leakage slot holes in the outer conductor and the leakage slot holes in the waveguide conductor are both arranged back to the back rib.

Preferably, the leaky coaxial cable is circular or square in shape.

Preferably, the outer sheath is one of PE, LSZH, FEP and PFA.

Meanwhile, the application also provides a coverage system which comprises a signal source, a connecting element, a load, an antenna and the fusion type leaky cable, wherein connectors are arranged at two ends of the fusion type leaky cable, one end of the fusion type leaky cable is connected with the signal source through the connectors and the connecting element, and the other end of the fusion type leaky cable is connected with any one of the signal source, the load and the antenna through the connectors and the connecting element.

Compared with the prior art, the fused leaky cable provided by the invention has the advantages that the leaky coaxial cable and the leaky waveguide are fused to form a leaky cable, so that the installation space and the construction difficulty are reduced. Meanwhile, high-frequency signals are transmitted in the leaky waveguide and radiated through a leaky slot on a waveguide conductor of the leaky waveguide, and lower-frequency signals are transmitted in the leaky coaxial cable and radiated through a leaky slot on an outer conductor of the leaky coaxial cable, so that the fused leaky cable has high frequency compatibility.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a slot diagram of a leaky coaxial cable according to the first embodiment;

FIG. 2 is a slot diagram of a leaky waveguide according to the first embodiment;

fig. 3 is a schematic cross-sectional view of the fusion-type leaky cable in the first embodiment;

FIG. 4 is a slot diagram of a leaky coaxial cable according to the second embodiment;

FIG. 5 is a slot diagram of a leaky waveguide in the second embodiment;

fig. 6 is a schematic cross-sectional view of the fusion-type leaky cable in the second embodiment;

fig. 7 is a schematic cross-sectional view of the fusion-type leaky cable according to the third embodiment;

fig. 8 is a schematic view of a tunnel covering system using the fusion-type leaky cable according to the fourth embodiment;

FIG. 9 is a schematic view of a passive room covering system using a hybrid leaky cable according to the fifth embodiment;

fig. 10 is a schematic view of an active room partial coverage system using the fusion-type leaky cable according to the sixth embodiment.

Reference numerals and component parts description referred to in the drawings:

1. an outer sheath; 2. a leaky coaxial cable; 3. a leaky waveguide; 4. a filling layer; 5. a leaky slot; 6. back ribs; 21. an inner conductor; 22. an outer conductor; 23. a first insulating filling layer; 31. a waveguide conductor; 32. a second insulating filling layer; 7. a signal source; 8. a combiner; 9. a fused leaky cable; 10. a load; 11. a coupler; 12 power divider; 13. an antenna.

Detailed Description

The technical solution of the present invention will be clearly and completely described by the following detailed description. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

In the present embodiment, the leakycoaxial cable 2 and theleaky waveguide 3 are preferably arranged at a distance of 0mm from each other and in a tangential configuration.

Specifically, referring to fig. 1 to 3, the fused leaky cable includes a leakycoaxial cable 2 and aleaky waveguide 3. The leakycoaxial cable 2 includes aninner conductor 21, anouter conductor 22, and a first insulating fillinglayer 23, wherein theinner conductor 21 is disposed inside theouter conductor 22, and the first insulating fillinglayer 23 is disposed therebetween. The first insulatingfiller layer 23 may be expanded polyethylene, PTFE (polytetrafluoroethylene), or FEP (Fluorinated ethylene propylene copolymer, also known as perfluoroethylene propylene copolymer). Theleaky waveguide 3 includes awaveguide conductor 31 and a second insulating fillinglayer 32, and the second insulating fillinglayer 32 is provided inside thewaveguide conductor 31. The second insulatingfill 32 may be air, expanded polyethylene, PTFE, or FEP. The leakycoaxial cable 2 is in contact with theleaky waveguide 3 in a tangential manner, namely the outer side wall of thewaveguide conductor 31 is in contact with the outer side wall of theouter conductor 22 in a tangential manner, and afilling layer 4 is arranged in a gap between thewaveguide conductor 31 and theouter conductor 22 to theouter sheath 1. Thefilling layer 4 is filled with one of filling materials of a filling rope, a filling rod or a sheath.

Thewaveguide conductor 31 and theouter conductor 22 are provided withleaky slots 5 along the axial direction thereof for transmitting and radiating signals. Theleakage slot 5 is one or more of an elliptical hole, a rectangular hole, a splayed inclined hole, a fission hole, an L-shaped hole, a U-shaped hole, an E-shaped hole, a T-shaped hole, a triangular hole and a polygonal hole, and in the embodiment, a fission splayed inclined hole is adopted. In order to achieve better radiation, theleaky slot 5 in theouter conductor 22 and theleaky slot 5 in thewaveguide conductor 31 are preferably arranged facing away from theback rib 6.

Theleaky waveguide 3 in this embodiment is one of a leaky circular waveguide, a leaky elliptical waveguide, a leaky rectangular waveguide, a leaky semicircular waveguide, a leaky semi-elliptical waveguide, a leaky ridge waveguide, and a leaky shaped waveguide, or other deformed structures may be used, and the shape of the leakycoaxial cable 2 is circular or square and other deformed structures. Theleaky waveguide 3 is a leaky elliptic waveguide, and the leakycoaxial cable 2 is exemplified by a circular structure.

Example two

In the present embodiment, the leakycoaxial cable 2 and theleaky waveguide 3 are preferably arranged at a distance of 0mm from each other and in an intersecting configuration.

Specifically referring to fig. 4-6, the fused leaky cable comprises a leakycoaxial cable 2 and aleaky waveguide 3. The leakycoaxial cable 2 includes aninner conductor 21, anouter conductor 22, and a first insulating fillinglayer 23, wherein theinner conductor 21 is disposed inside theouter conductor 22, and the first insulating fillinglayer 23 is disposed therebetween. The first insulatingfiller layer 23 may be expanded polyethylene, PTFE or FEP. Theleaky waveguide 3 includes awaveguide conductor 31 and a second insulating fillinglayer 32. The second insulatingfill 32 may be air, expanded polyethylene, PTFE, or FEP. Thewaveguide conductor 31 is sleeved outside theouter conductor 22, the leakycoaxial cable 2 and theleaky waveguide 3 are arranged in an intersecting manner, namely thewaveguide conductor 31 and theouter conductor 22 are arranged in an intersecting manner, the intersecting portions of thewaveguide conductor 31 and theouter conductor 22 can be shared, afilling layer 4 is arranged between thewaveguide conductor 31 and theouter sheath 1, and one filling material of a filling rope, a filling rod or a sheath is filled in thefilling layer 4.

Thewaveguide conductor 31 and theouter conductor 22 are provided withleaky slots 5 along the axial direction thereof for transmitting and radiating signals. Theleakage slot 5 is one or more of an elliptical hole, a rectangular hole, a splay inclined hole, a fracture hole, an L-shaped hole, a U-shaped hole, an E-shaped hole, a T-shaped hole, a triangular hole and a polygonal hole, in the embodiment, theleakage slot 5 formed in theouter conductor 22 is a periodic four-eight inclined hole, and theleakage slot 5 formed in thewaveguide conductor 31 is a periodic four-eight inclined hole with two different sizes and different periods. In order to make the radiation effect better, the leakingslot 5 on theouter conductor 22 and the leakingslot 5 on thewaveguide conductor 31 are both arranged back to theback rib 6, and theouter sheath 1 is marked by a color bar at the position corresponding to the leakingslot 5.

The leakycoaxial cable 2 in the present embodiment is circular or square in shape, and the leakycoaxial cable 2 described above adopts a circular structure as an example.

EXAMPLE III

Referring specifically to fig. 7, the fused leaky cable includes two leakycoaxial cables 2 and oneleaky waveguide 3. The two leakycoaxial cables 2 are arranged oppositely and are intersected with theleaky waveguide 3. The rest of the structure is the same as that of the second embodiment.

Further, the present application also provides a covering system using the fusion-type leaky cable.

Example four

Referring to fig. 8, the covering system is a tunnel covering system using a fusion type leaky cable. The connecting elements comprise acombiner 8 and jumper wires, thesignal source 7, thecombiner 8 and the fusion typeleaky cable 9 are connected through the jumper wires, and connectors are arranged at two ends of the fusion typeleaky cable 9. The fused leaky cable can be disconnected, and jumper wires are adopted to jump or connect the load 10 at the disconnected position. Thesignal source 7 adopts a BBU + RRU fiber remote mode, and the BBU is transmitted with the RRU through the fiber.

The signal of the lower frequencyband signal source 7 is combined by thecombiner 8 and then enters the leakycoaxial cable 2 of the fusionleaky cable 9 for transmission and coverage; the signal of the higher frequencyband signal source 7 is combined by thecombiner 8 and then enters theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage. For example, for a signal system, signals of the 1.8GHzband signal source 7 are combined by thecombiner 8 and then enter the leakycoaxial cable 2 of the fusedleaky cable 9 for transmission and coverage; signals of the 5GHz frequencyband signal source 7 are combined by thecombiner 8 and then enter theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage. For a mobile communication system, signals of a 0.7-3.8GHz frequencyband signal source 7 are combined by acombiner 8 and then enter a leakycoaxial cable 2 of a fusionleaky cable 9 for transmission and coverage; signals of the 4.8-5GHz signal source 7 are combined by thecombiner 8 and then enter theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage.

EXAMPLE five

Referring to fig. 9, the cover system is a passive room-division cover system using a fusion-type leaky cable. The connection elements comprise acombiner 8, acoupler 11, apower divider 12 and jumper wires, thesignal source 7, thecombiner 8, the fusedleaky cable 9, thecoupler 11 and thepower divider 12 are connected through the jumper wires, connectors are arranged at two ends of the fusedleaky cable 9, the tail end of the fusedleaky cable 9 is connected with a load 10 or an antenna 13, thesignal source 7 adopts a BBU + RRU optical fiber remote mode, and the BBU transmits with the RRU through the optical fibers.

The signals of the lower frequencyband signal source 7 are combined by thecombiner 8 and then enter the leakycoaxial cable 2 of the fusion typeleaky cable 9 for transmission and coverage, and the signals of the higher frequencyband signal source 7 are combined by thecombiner 8 and then enter theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage. For example, signals of thesignal source 7 in the frequency range of 0.7 to 3.8GHz are combined by thecombiner 8 and then enter the leakycoaxial cable 2 of the fusedleaky cable 9 for transmission and coverage; signals of the 4.8-5GHz frequencyband signal source 7 are combined by thecombiner 8 and then enter theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage.

EXAMPLE six

Referring to fig. 10, the cover system is an active room sub-cover system using a fusion type leaky cable. The connection element comprises acombiner 8 and a jumper, thesignal source 7, thecombiner 8 and the fusion typeleaky cable 9 are connected through the jumper, connectors are mounted at two ends of the fusion typeleaky cable 9, the tail end of the fusion typeleaky cable 9 is connected with a load 10 or an antenna 13, thesignal source 7 adopts a BBU + RHUB/PBridge + pRRU remote mode, the BBU is connected with the RHUB/PBridge through optical fibers, and the RHUB/PBridge and the pRRU are transmitted through an optical-electrical composite cable or a data cable.

The signals of the lower frequency band and the higher frequency band of thesignal source 7 are divided into two paths through thecombiner 8, and the two paths enter the leakycoaxial cable 2 and theleaky waveguide 3 of the fusion typeleaky cable 9 respectively for transmission and coverage. For example, a 0.7-3.8GHz band signal of thesignal source 7 enters the leakycoaxial cable 2 of the fusedleaky cable 9 through thecombiner 8 for transmission and coverage; and 4.8-5GHz band signals of thesignal source 7 pass through thecombiner 8 and then enter theleaky waveguide 3 of the fusion typeleaky cable 9 for transmission and coverage.

The fused leaky cable provided by the invention integrates the leaky coaxial cable and the leaky waveguide, the lower frequency band is transmitted in the leaky coaxial cable, and the higher frequency band is transmitted in the leaky waveguide, so that the use frequency band of the leaky cable is expanded to a high frequency and has higher compatibility.

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

Claims (11)

1. A fused leaky cable is characterized in that: the leakage coaxial cable and the leakage waveguide form an integral structure, and the distance between the leakage coaxial cable and the leakage waveguide is 0-20 mm.

2. The fused leaky cable as claimed in claim 1, wherein: the leakage coaxial cable and the leakage waveguide are arranged in the cavity, the outer side wall of the outer sheath is provided with at least one position indication back rib in a protruding mode, and the filling layer is arranged between the outer sheath and the leakage coaxial cable and between the outer sheath and the leakage waveguide.

3. The fused leaky cable as claimed in claim 2, wherein: the filling layer is filled with one filling material of filling ropes, filling rods or sheaths.

4. The fused leaky cable as claimed in claim 3, wherein: the leaky coaxial cable comprises an inner conductor, an outer conductor and a first insulating filling layer, wherein the inner conductor is arranged in the outer conductor, the first insulating filling layer is arranged between the inner conductor and the outer conductor, the leaky waveguide comprises a waveguide conductor and a second insulating filling layer, the second insulating filling layer is arranged in the waveguide conductor, the leaky coaxial cable is in tangential abutting contact with the outer part of the leaky waveguide, namely the outer side wall of the waveguide conductor is in tangential abutting contact with the outer side wall of the outer conductor, and the filling layer is arranged in a gap between the waveguide conductor and the outer conductor to the outer sheath.

5. The fused leaky cable as claimed in claim 4, wherein: leakage slotted holes are formed in the waveguide conductor and the outer conductor along the axial direction of the waveguide conductor and are one or more of oval holes, rectangular holes, splayed inclined holes, split holes, L-shaped holes, U-shaped holes, E-shaped holes, T-shaped holes, triangular holes and polygonal holes, and the leakage slotted holes in the outer conductor and the leakage slotted holes in the waveguide conductor are arranged back to the back ribs.

6. The fused leaky cable as claimed in claim 4, wherein: the leaky waveguide is one of a leaky circular waveguide, a leaky elliptical waveguide, a leaky rectangular waveguide, a leaky semicircular waveguide, a leaky semi-elliptical waveguide, a leaky ridge waveguide and a leaky special-shaped waveguide, and the leaky coaxial cable is circular or square.

7. The fused leaky cable as claimed in claim 3, wherein: the leaky coaxial cable comprises an inner conductor, an outer conductor and a first insulating filling layer, wherein the inner conductor is arranged in the outer conductor, the first insulating filling layer is arranged between the inner conductor and the outer conductor, the leaky waveguide comprises a waveguide conductor and a second insulating filling layer, the second insulating filling layer is arranged in the waveguide conductor, the leaky coaxial cable and the leaky waveguide are arranged in an intersecting mode, namely the outer conductor and the waveguide conductor are arranged in an intersecting mode, and the filling layers are arranged between the waveguide conductor and the outer sheath.

8. The fused leaky cable as claimed in claim 7, wherein: leakage slotted holes are formed in the waveguide conductor and the outer conductor along the axial direction of the waveguide conductor and are one or more of oval holes, rectangular holes, splayed inclined holes, split holes, L-shaped holes, U-shaped holes, E-shaped holes, T-shaped holes, triangular holes and polygonal holes, and the leakage slotted holes in the outer conductor and the leakage slotted holes in the waveguide conductor are arranged back to the back ribs.

9. The fused leaky cable as claimed in claim 7, wherein: the leaky coaxial cable is circular or square in shape.

10. The fused leaky cable as claimed in claim 1, wherein: the outer sheath adopts one of PE, LSZH, FEP and PFA.

11. An overlay system comprising a source, a connecting element, a load and an antenna, characterized in that: the hybrid leakage cable of any one of claims 1 to 10, wherein connectors are provided at both ends of the hybrid leakage cable, one end of the hybrid leakage cable is connected to the source through the connectors and the connecting element, and the other end of the hybrid leakage cable is connected to any one of the source, the load and the antenna through the connectors and the connecting element.

Images