KR102020067B1 - Leaky Coaxial Cable - Google Patents

Leaky Coaxial Cable Download PDF

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Publication number
KR102020067B1
KR102020067B1 KR1020130018464A KR20130018464A KR102020067B1 KR 102020067 B1 KR102020067 B1 KR 102020067B1 KR 1020130018464 A KR1020130018464 A KR 1020130018464A KR 20130018464 A KR20130018464 A KR 20130018464A KR 102020067 B1 KR102020067 B1 KR 102020067B1
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KR
South Korea
Prior art keywords
protective film
slot
coaxial cable
outer conductor
leaky coaxial
Prior art date
Application number
KR1020130018464A
Other languages
Korean (ko)
Other versions
KR20140104687A (en
Inventor
신상식
백종섭
백종원
손강호
Original Assignee
엘에스전선 주식회사
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Priority to KR1020130018464A priority Critical patent/KR102020067B1/en
Publication of KR20140104687A publication Critical patent/KR20140104687A/en
Application granted granted Critical
Publication of KR102020067B1 publication Critical patent/KR102020067B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • H01B11/1843—Construction of the insulation between the conductors of tubular structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/203—Leaky coaxial lines

Abstract

Provides leaky coaxial cable. The leaky coaxial cable has an inner conductor, a cylindrical dielectric formed on the outside of the inner conductor, an outer conductor surrounding the dielectric and having at least one slot for radiating an RF signal transmitted through the inner conductor to the outside, the outer conductor A protective film for protecting the slot between the outer jacket surrounding the slot and the slotted area of the outer conductor and the outer jacket, wherein the width of the protective film is between two and three times the length of the slot; It features.

Description

Leaky Coaxial Cable {Leaky Coaxial Cable}

The present invention relates to a leaky coaxial cable, and more particularly, to a leaky coaxial cable that suppresses deformation of a slot.

Leaky CoaXial cable (LCX) is generally installed in tunnels or underground facilities (underground malls, parking lots, subways) where radio wave quality is unstable, and is used to transmit or relay radio waves along the cable.

The leaky coaxial cable may leak electromagnetic waves to the outside through slots formed at regular intervals in the outer conductor, and the performance of the leaky coaxial cable may depend on the shape, size, and spacing of the slots. In particular, the polarization of the radio wave leaked to the outside through the slot is determined according to the shape of the slot, and in general, when the long side of the slot is arranged in the circumferential direction, horizontal polarization is predominant, and the long side of the slot is arranged in the wire axis direction In this case, vertical polarization may prevail.

Meanwhile, in the leakage coaxial cable, a coupling loss, which is a main electrical characteristic, is determined according to the shape of the slot formed in the outer conductor. Coupling loss means that the level of power received by the interference of electromagnetic waves emitted from adjacent slots is reduced. Coupling loss is one of the main characteristics that determine the performance of a leaky coaxial cable, and the coupling loss characteristic of a leaky coaxial cable when the slot formed in the outer conductor is distorted or broken by external factors such as winding or cutting of the cable. This is likely to deteriorate.

Korean Laid-Open Patent No. 2007-0082228, “Broadband Leakage Coaxial Cable”

In order to solve the above-mentioned problems of the prior art, the present invention provides a leaky coaxial cable that can prevent the shape of the slot formed in the outer conductor from being deformed by an external factor.

In addition, the present invention provides a leaky coaxial cable that can maintain the bending characteristics and winding quality of the cable while maintaining the shape of the slot formed in the outer conductor.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood from the following description.

In order to achieve the above object, the leaky coaxial cable according to the first aspect of the present invention, the inner conductor, a cylindrical dielectric formed on the outside of the inner conductor, surrounds the dielectric, and transmits the RF signal transmitted through the inner conductor An outer conductor having one or more slots formed to radiate to the outside, an outer jacket surrounding the outer conductor, and a protective film protecting the slot between the slotted area of the outer conductor and the outer jacket; The width of the protective film is characterized in that it is between two and three times the length of the slot.

Here, the tensile strength of the protective film may be 6.5 kgf / 15mm or more.

Here, the thickness of the protective film may be 0.05mm to 0.15mm.

Here, the width of the protective film may be 1/5 to 2/3 of the circumferential length of the outer conductor.

Here, the adhesive force of the protective film may be 500 gf / 15mm or more.

Here, the protective film may be bonded to the outer conductor by an adhesive material applied to one surface.

Specific details for achieving the above object will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be configured in different forms, and the present embodiments are intended to complete the disclosure of the present invention and to provide general knowledge in the technical field to which the present invention belongs. It is provided to fully inform those who have the scope of the invention.

According to one of the problem solving means of the present invention mentioned above, the shape of the slot formed in the outer conductor can be prevented from being deformed by an external factor.

In addition, it is possible to maintain the bending characteristics and winding quality of the cable while maintaining the shape of the slot formed in the outer conductor.

1 is an exploded perspective view showing the structure of a leaky coaxial cable according to an embodiment of the present invention.
2 is a view showing the structure of the outer conductor and the protective film in the leaky coaxial cable of FIG.
3 is an experimental result table showing a characteristic change of the leaky coaxial cable according to the specification of the protective film of FIG.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, in the present specification, electromagnetic waves are radio waves along a direction in which waves travel due to interaction between an electric field and a magnetic field.

Hereinafter, with reference to the accompanying drawings will be described in detail for the practice of the present invention.

1 is an exploded perspective view showing the structure of a leaky coaxial cable according to an embodiment of the present invention.

As shown in FIG. 1, the leaky coaxial cable 100 of the present invention may sequentially have an inner conductor 110, an insulator 120, an outer conductor 130, a protective film 140, and an outer jacket 150 from a central portion thereof. It consists of a configuration comprising a.

The leaky coaxial cable 100 may radiate or transmit electromagnetic waves to the outside through a plurality of slots 132 formed in the outer conductor 130 in the cable length direction, and the slot 132 formed in the outer conductor 130. You can adjust the frequency of use and the mode of electromagnetic leakage by adjusting the shape, size, or spacing (slot period) of the.

The inner conductor 110 is a conductive wire made of a conductive metal material. As the metal material, for example, copper wires, copper wires, copper wires, copper wire steels, tin-plated copper wires, silver plated wires, or copper aluminum may be used. However, the metal material is not particularly limited. In addition, the inner conductor 110 may function as a transmission path of electromagnetic energy transmitted and received through the slot 132.

The insulator 120 is a low loss dielectric that surrounds the inner conductor 110 and is highly foamed to insulate the inner conductor 110 from the outer conductor 120 and to reduce loss of electromagnetic energy. For reference, the insulator 120 may be formed of a material such as HDPE (high density polyethylene), LDPE (low density polyethylene), or the like, as long as the insulator 120 may satisfy requirements such as foaming degree, flame retardant performance, insulation breakdown voltage, or insulation resistance. .

The outer conductor 130 is formed around the insulator 120. The outer conductor 130 may be formed of a conductive metal material such as copper or aluminum. In addition, the outer conductor 130 functions as a shield layer for shielding electromagnetic waves, and may be connected to a separate ground line for grounding.

One or more slots 132 having a predetermined pattern may be formed in the outer conductor 130 to leak or transmit electromagnetic waves generated by the RF signal flowing along the inner conductor 110 to the outside. At this time, the leaky coaxial cable 100 operates in the coupling mode or the radiation mode according to the relative relationship between the wavelength and the slot interval.

The slot 132 formed in the outer conductor 130 is punched or processed to have a specific pattern, and may be formed in a suitable shape according to the frequency of use or propagation mode. The slots 132 are arranged to be aligned on one or more slot arrangement axes in the longitudinal direction of the leaky coaxial cable 100, and are arranged to be spaced apart by a predetermined distance between adjacent slots 132.

The period of the slot 132 is a period in which a series of slot patterns repeatedly formed in the slot structure is repeated, and is a distance from the start point of the first slot of the slot pattern to the start point of the first slot of the next slot pattern.

On the other hand, the polarization of the electromagnetic wave emitted according to the shape of the slot 132 is determined. For example, when the long side of the slot is disposed in the circumferential direction, as in the vertical slot 132 of FIG. 1, horizontal polarization mainly occurs. On the other hand, when the long side of the slot is disposed in the wire axis direction, the vertical polarization is It occurs mainly.

The protective film 140 is formed between the area where the slot of the outer conductor 130 is formed and the outer jacket to maintain and protect the shape of the slot. When the shape of the slot 132 formed in the outer conductor 130 is deformed by winding or cutting the leaky coaxial cable 100, the coupling loss characteristic of the leaky coaxial cable 100 is deteriorated or is different from the original design value. You lose. To prevent this, it is possible to maintain and protect the shape of the slot 132 by the force applied from the outside by adding a protective film 140 having a tacky to the position where the slot 132 of the outer conductor 130 is formed. . Detailed characteristics of the protective film 140 will be described later with reference to FIG. 2.

The outer jacket 150 is coated around the outer conductor 130 by extrusion molding to prevent corrosion and breakage of the outer conductor 130. The outer jacket 150 preferably uses a resin having good flexibility. In addition, the support line 160 may be formed on one side of the outer jacket 150.

Next, detailed characteristics of the protective film 140 will be described.

Figure 2 shows the structure of the outer conductor and the protective film in a leaky coaxial cable according to an embodiment of the present invention.

Referring to FIG. 2, a plurality of slots 132 are formed at one side of the outer conductor 130, and a protective film 140 is formed at a portion where the slots 132 are formed. In this case, the adhesive film may be coated on one or both surfaces of the protective film 140 so that the protective film 140 may be attached to a portion of the dielectric 120 exposed by the outer conductor 130 and the slot 132. Therefore, even if the leaky coaxial cable 100 is bent and bent, the adhesion between the outer conductor 130 and the protective film 140 is improved by the protective film 140 to form a slot 132 formed in the outer conductor 130. This deformation can be suppressed.

On the other hand, the protective film 140 may have a color of white or bright to increase the identification with the outer conductor (130).

Width T L of Protective Film 140 Silver is preferably two to three times the length S L of the slot 132. At this time, the length of the protective film 140 and the slot 132 means the length in the circumferential direction of the cable perpendicular to the longitudinal direction of the leaky coaxial cable 100. Width T L of Protective Film 140 When the slot length S L is less than or equal to two, the adhesive surface of the protective film 140 and the outer conductor 130 may be opened by bending the leaky coaxial cable 100, and the width T L of the protective film 140. When the slot length S L is three times or more, the bonding process of the protective film 140 becomes complicated and the defective rate may increase.

In addition, the width T L of the protective film 140 Silver is preferably 1/5 to 2/3 of the circumferential length of the leaky coaxial cable 100. Through this, the operation of adhering the protective film 140 to the outer conductor 130 is easy, and the total weight and manufacturing cost of the leaky coaxial cable 100 are reduced.

In addition, the thickness of the protective film 140 is preferably 0.05 mm to 0.15 mm. If the thickness of the protective film 140 exceeds 0.15 mm, irregularities caused by the protective film 140 are generated in the outer jacket 150.

3 is a table showing the results of measuring the state of the main characteristics of the leaky coaxial cable according to the width of the protective film 140.

Referring to FIG. 3, the coverage of the protective film 140 (width T L of the protective film) A total of eight tests were performed, including seven experiments (cases 1 to 7) varying the slot length S L ) and an experiment (case 8) when the protective film 140 was not attached, and the results were collected. At this time, the characteristics of the cable to be checked is the quality of the winding of the outer conductor at the time of slot processing (degrees unevenness occurs in the outer jacket 150 when winding the cable due to the slot 132 formed in the outer conductor 130), coupling Loss, bending characteristics, tensile strength and adhesion of the protective film 140, and the like.

First, when the protective film 140 is not attached, the winding quality of the outer conductor during slotting process is good, but due to the deformation of the slot, both the coupling loss and the bending characteristic of the leaky coaxial cable 100 may be deteriorated. (case 8).

On the other hand, when the coverage of the protective film 140 is less than 2.0 (cases 5 to 7), regardless of the tensile strength and adhesive strength of the protective film 140, it can be seen that the winding quality, bonding loss, and bending characteristics of the outer conductor are not good. have. This is because the unevenness is prominently generated in the outer jacket 150 due to the protective film 140 when the width of the protective film 140 is too narrow, and the width of the protective film 140 is too narrow so that the slot It is determined that the shape maintaining function of 132 is inferior.

On the other hand, when the coverage of the protective film 140 is 2.0 or more (cases 1 to 4), the tensile strength of the protective film 140 is 7.5 ~ 9.7 kgf / 15 mm, all measured as 6.5 kgf / 15 mm or more. In addition, the adhesive force of the protective film 140 was also measured to be 600 ~ 650 gf / 15 mm. In this case, the degree of unevenness generated in the outer jacket 150 during slotting was well measured, and it was determined that the coupling loss and the bending characteristics were satisfactory by improving the shape retaining function of the slot 132.

Therefore, in order to ensure the tensile strength and adhesive force at an appropriate level while maintaining the shape of the slot 132, it can be seen that it is preferable to set the width of the protective film 140 to 2 to 3 times the slot length.

Through the above configuration, the leaky coaxial cable of the present invention can prevent the shape of the slot formed in the outer conductor from being deformed by external factors. In addition, while maintaining the shape of the slot formed in the outer conductor there is an effect that can maintain the bending characteristics and winding quality of the cable.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: leakage coaxial cable 110: inner conductor
120: insulator 130: outer conductor
132: slot 140: protective film
150: outer jacket 160: support line

Claims (6)

For leaky coaxial cable,
Inner conductor;
A cylindrical dielectric formed on an outer side of the inner conductor;
An outer conductor surrounding the dielectric and configured to have a long hole shape in the circumferential direction of the dielectric for radiating the RF signal transmitted through the inner conductor to the outside, and having a plurality of slots spaced apart in the longitudinal direction of the leaky coaxial cable;
An outer jacket surrounding the outer conductor; And
And a protective film protecting the slot between the slotted region of the outer conductor and the outer jacket.
The thickness of the protective film is 0.05mm to 0.15mm, the tensile strength of the protective film is 6.5 kgf / 15mm or more, the adhesive force of the protective film is 500 gf / 15mm or more,
The circumferential width of the protective film is between 2 and 3 times the circumferential length of the slot, and is 1/5 to 2/3 of the circumferential length of the outer conductor. delete delete delete delete The method of claim 1,
The protective film is leaky coaxial cable, characterized in that bonded to the outer conductor by an adhesive material applied to one surface.
KR1020130018464A 2013-02-21 2013-02-21 Leaky Coaxial Cable KR102020067B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130018464A KR102020067B1 (en) 2013-02-21 2013-02-21 Leaky Coaxial Cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130018464A KR102020067B1 (en) 2013-02-21 2013-02-21 Leaky Coaxial Cable

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KR20140104687A KR20140104687A (en) 2014-08-29
KR102020067B1 true KR102020067B1 (en) 2019-09-09

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100761597B1 (en) 2006-02-15 2007-09-27 엘에스전선 주식회사 A broadband leaky coaxial cable
KR100761598B1 (en) * 2006-02-17 2007-09-27 엘에스전선 주식회사 Method for manufacturing leaky coaxial cable of high water-proofing
CN102763278A (en) * 2010-02-12 2012-10-31 株式会社藤仓 Leaky coaxial cable

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