KR100907580B1 - Flame-retardant leaky coaxial cable - Google Patents

Flame-retardant leaky coaxial cable Download PDF

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Publication number
KR100907580B1
KR100907580B1 KR1020080020474A KR20080020474A KR100907580B1 KR 100907580 B1 KR100907580 B1 KR 100907580B1 KR 1020080020474 A KR1020080020474 A KR 1020080020474A KR 20080020474 A KR20080020474 A KR 20080020474A KR 100907580 B1 KR100907580 B1 KR 100907580B1
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South Korea
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coaxial cable
leaky coaxial
flame retardant
flame
outer conductor
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KR1020080020474A
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Korean (ko)
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조영일
조봉권
이형국
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엘에스전선 주식회사
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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
    • 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
    • H01B11/1869—Construction of the layers on the outer side of the outer conductor
    • 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
    • H01B11/1895—Particular features or applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • 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
    • 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
    • H01Q13/22—Longitudinal slot in boundary wall of waveguide or transmission line

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Abstract

A flame-retardant leaky coaxial cable is provided to prevent the loss of transmission of a cable while securing nonflammable of a cable by installing insulating member between nonflammable jacket and outer conductor. A flame-retardant leaky coaxial cable is composed of a coaxial cable, a internal conductor(110), an outer conductor(130), a second insulating member(140), and nonflammable jacket(150). The internal conductor is a conductive metal material, and a first insulator insulates the space between the internal conductor and the outer conductor by a insulating layer of external side. The outer conductor is an electromagnetic wave shield layer while being installed at external circumference of the first insulating member.

Description

난연성 누설 동축 케이블{Flame-retardant Leaky Coaxial Cable}Flame-retardant Leaky Coaxial Cable

본 발명은 난연성 누설 동축 케이블에 관한 것으로, 더욱 상세하게는 케이블의 난연성을 보장함과 동시에 케이블의 전송손실을 감소시킬 수 있는 난연성 누설 동축 케이블에 관한 것이다. 여기서, 누설 동축 케이블이란, FM, Pager, Cellular 대역에서만 사용할 수 있는 통상적인 누설 동축 케이블과, UHF 대역에서도 사용될 수 있는 광대역 RF용 누설 동축 케이블(예컨데, RFCX 및 RFCL)을 모두 포함하는 개념이다. The present invention relates to a flame retardant leaky coaxial cable, and more particularly to a flame retardant leaky coaxial cable that can ensure the flame retardancy of the cable and at the same time reduce the transmission loss of the cable. Here, the leaky coaxial cable is a concept including both a conventional leaky coaxial cable that can be used only in the FM, Pager, and Cellular bands, and a leaky coaxial cable (for example, RFCX and RFCL) for wideband RF that can also be used in the UHF band.

일반적으로, 터널, 지하 철로, 건물 지하 및 밀폐 공간 등과 같이 디스크리트 안테나(Discrete Antenna)로 무선 주파수(Radio Frequency)를 충분히 송ㆍ수신할 수 없는 장소에는 전송 라인(Transmission Line)과 안테나의 역할을 동시에 수행하는 누설 동축 케이블(Leaky Coaxial Cable)이 사용된다. In general, in a place where a radio frequency cannot be sufficiently transmitted and received by a discrete antenna such as a tunnel, underground railway, underground building, and an enclosed space, a transmission line and an antenna are simultaneously used. A leaky coaxial cable is used.

상기 누설 동축 케이블은 길이 방향을 따라 구비된 복수의 슬롯(Slot)을 통해 전파의 방사가 이루어지도록 한 케이블로서, 슬롯의 주기나 형태를 조절하여 자유롭게 특성 주파수를 설계할 수 있고, 어떠한 형태의 전파 음영지역이라도 포설이 용이하다.The leaky coaxial cable is a cable that allows radio waves to be radiated through a plurality of slots provided along a longitudinal direction, and can freely design a characteristic frequency by adjusting a period or a shape of a slot, and propagating any form It is easy to install even in the shaded area.

이하. 상기 누설 동축 케이블의 구조에 대해 도 1을 참조하여 구체적으로 설명한다. 도 1은 일반적인 누설 동축 케이블을 도시한 절개 사시도이다. Below. The structure of the leaky coaxial cable will be described in detail with reference to FIG. 1. 1 is a cutaway perspective view of a typical leaky coaxial cable.

도 1에 도시된 바와 같이, 일반적으로 누설 동축 케이블(10)은 중심부로부터 내부 도체(1), 절연체(2), 외부 도체(3) 및 외피(4)를 포함하여 구비되고, 외부 도체(3)에는 소정 형상의 슬롯(3a)이 규칙적으로 배열된다.As shown in FIG. 1, a leaky coaxial cable 10 is generally provided including an inner conductor 1, an insulator 2, an outer conductor 3 and an outer sheath 4 from a central portion, and an outer conductor 3. ) Slots 3a of a predetermined shape are regularly arranged.

그러나, 상기 일반적인 누설 동축 케이블(10)의 외피(4)는 난연재질로 이루어지지 않기 때문에 상기 누설 동축 케이블(10)이 설치된 장소에 화재가 발생하였을 때 상기 누설 동축 케이블(10)을 적절히 보호할 수 없는 문제가 있다. 따라서, 현재에는 상기 외피(4)를 난연제가 첨가된 고분자물질을 이용하여 형성하고 있다. However, since the shell 4 of the general leakage coaxial cable 10 is not made of a flame retardant material, the leakage coaxial cable 10 may be properly protected when a fire occurs in a place where the leakage coaxial cable 10 is installed. There is no problem. Therefore, the shell 4 is currently formed using a polymer material to which a flame retardant is added.

한편, 난연제는 크게 첨가형 난연제와 반응형 난연제로 분류되고, 상기 첨가형 난연제는 다시 유기난연제와 무기난연제로 구분된다. 현재, 난연제 시장에서는 상기 무기난연제가 가장 큰 부분을 차지하고 있는데, 이는 상기 무기난연제가 타 난연제에 비해 가격이 싸고, 할로겐화 유기화합물과 상승작용을 일으키며, Filler로 사용될 수 있기 때문이다.On the other hand, flame retardants are largely classified into additive flame retardants and reactive flame retardants, the additive flame retardants are classified into organic flame retardants and inorganic flame retardants again. Currently, the inorganic flame retardant occupies the largest part in the flame retardant market because the inorganic flame retardant is cheaper than other flame retardants, synergistic with halogenated organic compounds, and can be used as a filler.

상기 무기난연제에는 수산화알미늄, 수산화마그네슘, 산화안티몬, 수산화주석, 산화주석, 산화몰리브덴, 지르코늄화합물, 붕산염, 칼슘염 등이 있는데, 이중에서 수산화알미늄 및 수산화마그네슘의 수요가 가장 크다.The inorganic flame retardant includes aluminum hydroxide, magnesium hydroxide, antimony oxide, tin hydroxide, tin oxide, molybdenum oxide, zirconium compound, borate, calcium salt, etc. Among these, the demand for aluminum hydroxide and magnesium hydroxide is the greatest.

상기 외피(4)를 수산화알루미늄, 수산화마그네슘 등과 같이 수산화기를 포함하는 난연제가 첨가된 고분자물질을 이용하여 형성할 경우, 상기 외피(4)는 미세하게 전기전도성 성질을 갖게 된다. 그러나, 이와 같이 상기 외피(4)가 전기전도성 성질을 갖는 경우, 그렇지 않은 경우에 비해 상기 누설 동축 케이블(10)의 전송손실이 커지는 문제가 있다. 여기서, 전송손실은 케이블의 길이방향을 따라 전달되는 신호의 크기가 신호 입력단에서 멀어지면서 감쇄되는 양을 의미한다.When the outer shell 4 is formed using a polymer material to which a flame retardant including a hydroxyl group is added, such as aluminum hydroxide and magnesium hydroxide, the outer shell 4 has fine electric conductivity. However, when the sheath 4 has an electrically conductive property as described above, there is a problem in that the transmission loss of the leaky coaxial cable 10 is larger than that of the case 4 which is not. Here, the transmission loss means the amount of attenuation as the magnitude of the signal transmitted along the length of the cable moves away from the signal input terminal.

본 발명은 상술한 바와 같은 문제점을 해결하기 위한 것으로, 난연성을 보장함과 동시에 전송손실의 증가를 방지할 수 있는 난연성 누설 동축 케이블을 제공하는 것을 목적으로 삼고 있다. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a flame retardant leaky coaxial cable capable of ensuring flame retardancy and preventing an increase in transmission loss.

상술한 바와 같은 목적을 달성하기 위해 본 발명은, 내부도체와, 상기 내부도체의 외주면에 위치하는 절연체와, 상기 절연체의 외주면에 위치하며 전자기파의 방사를 위한 슬롯이 형성된 외부도체와, 상기 외부도체의 외주면에 위치하며 수산화기를 포함하는 난연제가 첨가된 난연자켓을 포함하는 난연성 누설 동축 케이블에 있어서, 상기 외부도체와 상기 난연자켓 사이에는 절연체가 장착되는 것을 특징으로 하는 난연성 누설 동축 케이블을 제공한다.In order to achieve the above object, the present invention provides an inner conductor, an insulator positioned on an outer circumferential surface of the inner conductor, an outer conductor formed on an outer circumferential surface of the insulator and having a slot for radiation of electromagnetic waves, and the outer conductor. In the flame retardant leaky coaxial cable comprising a flame retardant jacket is located on the outer peripheral surface of the flame retardant containing a hydroxyl group, provides a flame retardant leaky coaxial cable characterized in that the insulator is mounted between the outer conductor and the flame retardant jacket.

여기서, 상기 누설 동축 케이블은, FM, Pager, Cellular 대역에서만 사용할 수 있는 통상적인 누설 동축 케이블과, UHF 대역에서도 사용될 수 있는 광대역 RF용 누설 동축 케이블(예컨데, RFCX 및 RFCL) 모두를 의미한다.Here, the leaky coaxial cable means both a conventional leaky coaxial cable that can be used only in the FM, Pager, and Cellular bands, and a leaky coaxial cable (for example, RFCX and RFCL) for wideband RF that can also be used in the UHF band.

본 발명에 의하면, 최외곽층에 난연자켓이 위치하고 상기 난연자켓과 외부도체 사이에 절연체가 위치하기 때문에 케이블의 난연성이 보장됨과 동시에 상기 난연자켓에 포함된 수산화기로 인해 케이블의 전송손실이 증가하는 것을 방지할 수 있는 효과가 발생한다. According to the present invention, since the flame retardant jacket is located on the outermost layer and the insulator is located between the flame retardant jacket and the outer conductor, the flame retardancy of the cable is guaranteed and the transmission loss of the cable is increased due to the hydroxyl group included in the flame retardant jacket. An effect that can be prevented occurs.

이하, 본 발명의 바람직한 실시예를 도면의 참조하여 상세하게 설명한다. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

도 2는 본 발명에 따른 난연성 누설 동축 케이블의 일실시예를 도시한 절개 사시도이고, 도 3은 도 2의 난연성 누설 동축 케이블과 종래의 난연성 누설 동축 케이블의 전송손실을 비교한 컴퓨터 가상 실험 결과이다.FIG. 2 is a cutaway perspective view showing an embodiment of a flame retardant leaky coaxial cable according to the present invention, and FIG. 3 is a computer simulation result comparing the transmission loss of the flame retardant leaky coaxial cable of FIG. 2 and a conventional flame retardant leaky coaxial cable. .

앞서 설명한 바와 같이 본 발명에 따른 누설 동축 케이블은 통상적인 누설 동축 케이블과 광대역 RF용 누설 동축 케이블(예컨데, RFCX 및 RFCL) 모두를 포함하는 개념이다. 그러나, 상기 광대역 RF용 누설 동축 케이블은 외부도체의 형상, 상기 외부도체에 형성된 슬롯의 형태 및 주기 등에 있어서 상기 통상적인 누설 동축 케이블과 차이가 있을 뿐이고, 그 기본적인 구성은 상기 통상적인 누설 동축 케이블과 동일하다. 따라서, 이하에서는 상기 통상적인 누설 동축 케이블만을 예로 들어 본 발명의 기술적 사상을 설명한다. As described above, the leaky coaxial cable according to the present invention is a concept including both a conventional leaky coaxial cable and a leaky coaxial cable for wideband RF (eg, RFCX and RFCL). However, the wideband RF leakage coaxial cable differs from the conventional leaky coaxial cable only in the shape of the outer conductor, the shape and the period of the slot formed in the outer conductor, and the basic configuration thereof is different from that of the conventional leaky coaxial cable. same. Therefore, hereinafter, the technical spirit of the present invention will be described taking only the conventional leakage coaxial cable as an example.

본 발명에 따른 난연성 누설 동축 케이블(100)은 내부도체(110)와, 제1절연체(120)와, 외부도체(130)와, 제2절연체(140)와, 난연자켓(150)을 포함한다.The flame retardant leaky coaxial cable 100 according to the present invention includes an inner conductor 110, a first insulator 120, an outer conductor 130, a second insulator 140, and a flame retardant jacket 150. .

상기 내부도체(110)는 도전성이 있는 금속 소재의 도선이다. 상기 금속 소재로는 동관, 연동선, 동복 알루미늄선 등이 채택될 수 있으며, 상기 누설 동축 케이블(100)에 송ㆍ수신된 전자기파 에너지의 전송로(Transmission Line)이다.The inner conductor 110 is a conductive wire of a conductive metal material. The metal material may be a copper tube, an interlocking line, a copper aluminum wire, or the like, and is a transmission line of electromagnetic wave energy transmitted and received on the leaky coaxial cable 100.

상기 제1절연체(120)는 상기 내부도체(110)의 외주면에 위치하는 유전층으로 상기 내부도체(110)와 외부도체(130) 간을 절연하고, 상기 전자기파 에너지의 손실을 방지하는 유전 물질로 이루어져 있다. 상기 유전 물질로는 발포 플라스틱 또는 플라스틱 복합 절연물 등이 선택적으로 채택된다.The first insulator 120 is a dielectric layer positioned on the outer circumferential surface of the inner conductor 110 and insulates the inner conductor 110 from the outer conductor 130 and is made of a dielectric material that prevents loss of electromagnetic wave energy. have. As the dielectric material, a foamed plastic or a plastic composite insulator is selectively adopted.

상기 외부도체(130)는 도전성이 있는 금속 소재의 전자기파 차폐층으로 상기 제1절연체(120)의 외주면에 위치하고 접지선에 의해 접지(Earth)된다. 상기 금속 소재로는 동관 또는 라미네이트형 알루미늄 테이프 등이 선택적으로 채택될 수 있다. 상기 외부 도체(130)에는 다수의 방사 슬롯(132)이 형성되는데, 이로 인해 상기 제1유전체(120)의 일부가 노출될 수 있고 전자기파 에너지 전자기파 에너지가 방사 및 흡수될 수 있다.The outer conductor 130 is a conductive electromagnetic shielding layer of a metallic material and is located on the outer circumferential surface of the first insulator 120 and grounded by a ground line. As the metal material, a copper tube or a laminated aluminum tape may be selectively adopted. A plurality of radiation slots 132 are formed in the outer conductor 130, which may expose a portion of the first dielectric 120 and may radiate and absorb electromagnetic energy.

상기 제2절연체(140)는 상기 외부도체(130)의 외주면에 위치하는 유전층으로, 상기 난연자켓(150)에 포함된 수산화기(OH)에 의해 상기 누설 동축 케이블(100)의 전송손실이 증가하는 것을 방지할 수 있도록 상기 외부도체(130)와 상기 난연자켓(150) 간을 절연한다. 상기 제2절연체(140)는 발포 플라스틱 또는 플라스틱 복합 절연물 등으로 이루어진다.The second insulator 140 is a dielectric layer positioned on the outer circumferential surface of the outer conductor 130, and the transmission loss of the leakage coaxial cable 100 is increased by the hydroxyl group OH included in the flame retardant jacket 150. Insulating between the outer conductor 130 and the flame retardant jacket 150 to prevent the thing. The second insulator 140 is made of foamed plastic or plastic composite insulator.

상기 난연자켓(150)은 외부 도체(130)의 부식을 방지함과 동시에 화재발생시 그 내부에 위치하는 부품들(110, 120, 130, 140)을 보호하기 위한 것으로, 수산화기를 포함하는 무기난연제가 첨가된 고분자물질로 형성된다. The flame retardant jacket 150 is to prevent corrosion of the outer conductor 130 and at the same time to protect the parts (110, 120, 130, 140) located therein in case of fire, an inorganic flame retardant including a hydroxyl It is formed of added polymer material.

상기 누설 동축 케이블(100)은 제2절연체(140)를 포함하기 때문에 종래의 누설 동축 케이블에 비해 더 작은 전송손실을 갖게 된다. 이와 같은 효과를 입증하기 위해 본 출원인은 컴퓨터를 이용하여 모의 실험을 수행하였고, 그 결과가 도 3에 도시되어 있다.Since the leaky coaxial cable 100 includes the second insulator 140, the leaky coaxial cable 100 has a smaller transmission loss than the conventional leaky coaxial cable. Applicants have performed simulations using a computer to demonstrate this effect, and the results are shown in FIG. 3.

도 3에서 가로축은 상기 누설 동축 케이블(100)에 흐르는 신호의 주파수(단 위:GHz)를 나타내고, 세로축은 1km 당 상기 누설 동축 케이블(100)의 전송손실(단위:dB/km)을 나타낸다. 또한, 도 3에서 '나'는 상기 누설 동축 케이블(100)의 전송손실을 나타내고, '가'는 상기 누설 동축 케이블(100)에서 제2절연체(140)를 제거한 종래의 누설 동축 케이블의 전송손실을 나타낸다. 상기 누설 동축 케이블(100)과 종래의 누설 동축 케이블의 슬롯(132) 형상은 도 2에 도시된 바와 같이 가로가 세로보다 짧은 직사각형 형태로 형성하였으며, 슬롯(132) 간 거리는 100mm로 설정하였다.In FIG. 3, the horizontal axis represents the frequency (unit: GHz) of the signal flowing through the leaky coaxial cable 100, and the vertical axis represents the transmission loss (unit: dB / km) of the leaky coaxial cable 100 per km. In addition, in Figure 3 'b' represents the transmission loss of the leakage coaxial cable 100, 'ga' represents the transmission loss of the conventional leakage coaxial cable in which the second insulator 140 is removed from the leakage coaxial cable 100. Indicates. The shape of the slot 132 of the leaky coaxial cable 100 and the conventional leaky coaxial cable was formed in a rectangular shape shorter than the vertical length as shown in Figure 2, the distance between the slots 132 was set to 100mm.

도 3에 도시된 모의 실험 결과를 살펴보면, 가로축 전 범위에 걸쳐 상기 누설 동축 케이블(100)의 전송손실이 상기 종래의 누설 동축 케이블의 전송손실보다 작음을 확인할 수 있다.Looking at the simulation results shown in Figure 3, it can be seen that the transmission loss of the leakage coaxial cable 100 over the entire horizontal axis range is smaller than the transmission loss of the conventional leakage coaxial cable.

도 1은 일반적인 누설 동축 케이블을 도시한 절개 사시도이다. 1 is a cutaway perspective view of a typical leaky coaxial cable.

도 2는 본 발명에 따른 난연성 누설 동축 케이블의 일실시예를 도시한 절개 사시도이다.Figure 2 is a cutaway perspective view showing one embodiment of a flame retardant leaky coaxial cable according to the present invention.

도 3은 도 2의 난연성 누설 동축 케이블과 종래의 난연성 누설 동축 케이블의 전송손실을 비교한 컴퓨터 가상 실험 결과이다.3 is a computer simulation result comparing the transmission loss of the flame retardant leaky coaxial cable of FIG. 2 and the conventional flame retardant leaky coaxial cable.

Claims (1)

내부도체와, 상기 내부도체의 외주면에 위치하는 절연체와, 상기 절연체의 외주면에 위치하며 전자기파의 방사를 위한 슬롯이 형성된 외부도체와, 상기 외부도체의 외주면에 위치하며 수산화기를 포함하는 난연제가 첨가된 난연자켓을 포함하는 난연성 누설 동축 케이블에 있어서,An inner conductor, an insulator located on the outer circumferential surface of the inner conductor, an outer conductor formed on the outer circumferential surface of the insulator, and formed with a slot for radiation of electromagnetic waves, and a flame retardant including a hydroxyl group located on the outer circumferential surface of the outer conductor. In a flame retardant leaky coaxial cable comprising a flame retardant jacket, 상기 외부도체와 상기 난연자켓 사이에는 절연체가 장착되는 것을 특징으로 하는 난연성 누설 동축 케이블.Flame retardant leakage coaxial cable, characterized in that the insulator is mounted between the outer conductor and the flame retardant jacket.
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Publication number Priority date Publication date Assignee Title
KR20140069547A (en) * 2012-11-29 2014-06-10 엘에스전선 주식회사 Leaky Coaxial Cable with Enhanced Flexural Properties and Manufacturing Method thereof
CN103928172A (en) * 2014-04-26 2014-07-16 芜湖航天特种电缆厂 Flame-retardant cross linked polyethylene insulation power cable
JP2017188802A (en) * 2016-04-06 2017-10-12 日立金属株式会社 Leaky coaxial cable

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US4780695A (en) 1986-02-12 1988-10-25 Hitachi Cable Ltd. Refractory leakage coaxial cable
US5304739A (en) 1991-12-19 1994-04-19 Klug Reja B High energy coaxial cable for use in pulsed high energy systems
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US4280225A (en) 1977-08-24 1981-07-21 Bicc Limited Communication systems for transportation undertakings
US4780695A (en) 1986-02-12 1988-10-25 Hitachi Cable Ltd. Refractory leakage coaxial cable
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JPH0855524A (en) * 1994-08-15 1996-02-27 Mitsubishi Cable Ind Ltd Roadside heat resistant coaxial communication cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140069547A (en) * 2012-11-29 2014-06-10 엘에스전선 주식회사 Leaky Coaxial Cable with Enhanced Flexural Properties and Manufacturing Method thereof
CN103928172A (en) * 2014-04-26 2014-07-16 芜湖航天特种电缆厂 Flame-retardant cross linked polyethylene insulation power cable
CN103928172B (en) * 2014-04-26 2016-06-01 芜湖航天特种电缆厂 Fire retardant crosslinked polyethylene insulated power cable
JP2017188802A (en) * 2016-04-06 2017-10-12 日立金属株式会社 Leaky coaxial cable

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