CN101430949B - A kind of coaxial cable and the method for making coaxial cable - Google Patents

Abstract

The invention discloses a coaxial cable and a method for making the coaxial cable, which are used to solve the problems in the prior art that the coaxial cable is difficult to fix and install and inconvenient to lay. The method determines the first thickness of the copper inner conductor in the inner core layer of the coaxial cable, and the first thickness is determined according to the frequency of the transmission signal in the coaxial cable and the attribute information of the inner conductor; a metal or a metal with a smaller density than the inner conductor is selected. Metal alloy, according to the thickness of the inner core layer and the first thickness of the coaxial cable, the second thickness of the metal or metal alloy is determined; the inner core layer is made according to the first thickness and the second thickness, wherein the inner conductor is located in the metal or metal alloy The outer layer of the inner conductor; the outer layer of the inner conductor in the inner core layer is sequentially made into an insulating layer and an outer skin layer. The solution proposed by the present invention can effectively reduce the weight of the coaxial cable without changing the quality of the transmitted signal, reduce the difficulty of fixing and installing the coaxial cable, and facilitate the laying of the coaxial cable.

Description

A kind of coaxial cable and the method for making coaxial cable

technical field

The invention relates to the technical field of mobile communication, in particular to a coaxial cable and a method for making the coaxial cable. the

Background technique

With the popularization and diversification of mobile communications, there is a higher demand for network construction. At present, the feeders widely used in the mobile communication industry are basically made of copper. This is because copper has good electrical, mechanical and thermal properties. the

The weight of the copper coaxial cable, that is, the feeder is relatively large, so there are high requirements for the installation and fixing of the feeder. Especially for projects with a large demand for the promotion of feeder lines, such as the promotion of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) base stations of the 3rd Generation Mobile Communications System (3G) Time Division Synchronization , which is 9 times higher than that of the Global System for Mobile communications (GSM) base station for the feeder, and at the same time it puts forward higher requirements for the fixing and installation of the feeder. the

At present, the structure of a feeder commonly used in the technical field of mobile communication is shown in FIG. 1 . The feeder is usually a layered structure, and its components mainly include: outer skin layer, insulating layer, inner core layer and air layer from outside to inside. The outer skin layer is usually metal copper film, the insulating layer is usually filled with dielectric materials such as polyethylene, and the inner core layer is usually pure copper. the

In the prior art, because the copper used in the coaxial cable is of high quality, it increases the difficulty of fixing and installing the coaxial cable, and it is inconvenient to lay the coaxial cable. the

Invention content

In view of this, the embodiments of the present invention provide a coaxial cable and a method for manufacturing the coaxial cable to solve the problems in the prior art that the coaxial cable is difficult to fix and install and inconvenient to lay. the

A method for manufacturing a coaxial cable provided by an embodiment of the present invention includes: determining the first thickness of the copper inner conductor in the inner core layer of the coaxial cable, wherein the first thickness is based on the transmission signal in the coaxial cable The frequency and the attribute information of the inner conductor are determined; according to the thickness of the inner core layer in the coaxial cable and the first thickness, determine the metal or metal alloy with a density smaller than that of the inner conductor in the inner core layer The second thickness, wherein the ratio of the first thickness of the copper inner conductor to the second thickness of the metal or metal alloy is 1:3; according to the first thickness and the second thickness to make the inner core layer, wherein the The inner conductor is located on the outer layer of the metal or metal alloy; the outer layer of the inner conductor in the inner core layer is sequentially made into an insulating layer and an outer skin layer. the

The embodiments of the present invention provide a coaxial cable and a method for making the coaxial cable. First, it is necessary to determine the first thickness of the copper inner conductor in the inner core layer of the coaxial cable, and according to the inner core of the coaxial cable, the thickness of the layer, and said first thickness, determines a second thickness of a metal or metal alloy having a density less than that of said inner conductor in said inner core layer, the inner core layer is made according to said first thickness and second thickness, And in the inner core layer, an insulating layer and an outer skin layer are sequentially made on the outer layer of the inner conductor. The method for making a coaxial cable provided by the embodiment of the present invention can effectively reduce the weight of the coaxial cable without changing the quality of the transmitted signal, reduce the difficulty of fixing and installing the coaxial cable, and facilitate the coaxial cable laying. the

Fig. 1 is the structural representation of coaxial cable in the prior art;

Fig. 2 is the flow chart of the method for making inner conductor thickness in the coaxial cable that the embodiment of the present invention provides;

Fig. 3 is a schematic structural diagram of a coaxial cable provided by an embodiment of the present invention. the

In the embodiment of the present invention, in order not to change the quality of the transmission signal of the coaxial cable, and effectively reduce the weight of the coaxial cable, as shown in Figure 2, a method for making a coaxial cable is provided, which specifically includes the following steps :

S201: Determine a first thickness of a copper inner conductor in an inner core layer of a coaxial cable, wherein the first thickness is determined according to the frequency of a signal transmitted in the coaxial cable and attribute information of the inner conductor. the

The inner conductor in the inner core layer is generally copper. the

S202: Select a metal or metal alloy with a density smaller than that of the inner conductor, and determine a second thickness of the metal or metal alloy according to the thickness of the inner core layer in the coaxial cable and the first thickness. the

Making the inner core layer in the form of a copper inner conductor and a metal or metal alloy with a lower density than copper can effectively reduce the weight of the inner core layer, thereby reducing the weight of the coaxial cable. the

Detailed ways

At the same time, when a metal or a metal alloy with a density smaller than copper is selected and the price is cheaper than copper, the cost of the coaxial cable can be effectively reduced at the same time. the

S203: Fabricate an inner core layer according to the first thickness and the second thickness, wherein the inner conductor is located on the outer layer of the metal or metal alloy. the

Wherein, the metal or metal alloy is the inner layer of the inner core layer, the metal or metal alloy is adjacent to the air layer, and the copper inner conductor is located at the outer layer of the inner core layer. the

S204: Fabricate an insulating layer and an outer skin layer in sequence on the outer layer of the inner conductor in the inner core layer. the

In the embodiment of the present invention, the more commonly used inner conductor is made of copper, and of course it can also be other metal inner conductors. The inner conductor is located in the inner core layer of the coaxial cable, and the inner conductor is adjacent to the insulating layer of the coaxial cable. The inner core layer may also include: other metals or metal alloys with a density lower than that of the inner conductor. The metal or metal alloy is adjacent to the air layer. the

Using other metals or metal alloys with low density and the inner conductor as the inner core layer of the coaxial cable can effectively ensure the stability of the inner core of the coaxial cable. When choosing a metal or a metal alloy whose density is lower than copper and whose price is cheaper than copper, the cost of coaxial cable can be effectively reduced at the same time. the

An embodiment of the present invention provides a coaxial cable. The coaxial cable is composed of an outer skin layer, an insulating layer, an inner core layer and an air layer, wherein the outer skin layer is the outermost layer of the coaxial cable, and the air layer is the outermost layer of the coaxial cable. The innermost layer of the axial cable, the insulation layer is adjacent to the inner core layer of the outer skin layer, and the inner core layer is adjacent to the air layer of the insulation layer, wherein the inner core layer includes a copper inner conductor and a metal or metal with a lower density than the inner conductor Alloy, the inner conductor is located in the outer layer of the inner core layer, adjacent to the insulating layer, and the metal or metal alloy with a lower density than the inner conductor is located in the inner layer of the inner core layer, adjacent to the air layer, wherein the inner conductor in the inner core layer The thickness can determine the transmission thickness of the signal in the coaxial cable according to the frequency of the transmission signal in the coaxial cable and the attribute information of the inner conductor, and determine the thickness of the inner conductor in the inner core layer according to the transmission thickness . the

In a coaxial cable, since the transmitted signal is generally a high-frequency signal, when the high-frequency signal passes through the inner conductor of the inner core layer of the coaxial cable, it can be considered that the high-frequency signal is only on the surface of the inner conductor in the inner core layer. Transmission in a very thin layer adjacent to the insulating layer. That is, in the coaxial optical cable, the high-frequency signal is only transmitted in a very thin layer of the inner conductor of the inner core layer, which is close to the contact surface of the inner conductor of the inner core layer and the insulating layer. Moreover, the thickness of this layer is related to the frequency of the high-frequency signal in the coaxial cable and the attribute information of the inner conductor. The thickness can be determined by the following formula:

$\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; \&pi;f\&mu;\&sigma;</span>}}}$

Among them, δ is the thickness space range of high-frequency signal transmission in the coaxial cable, f is the frequency of the high-frequency signal in the coaxial cable, μ is the magnetic permeability of the inner conductor of the high-frequency signal in the coaxial cable, and σ is the inner conductor of the high-frequency signal in the coaxial cable. The conductivity of the conductor. the

According to the above formula, it can be seen that the spatial range of the transmission thickness of the high-frequency signal is inversely proportional to the frequency of the transmitted high-frequency signal. When the transmission frequency of the high-frequency signal is small, the thickness of the transmission signal is greater for the same inner conductor. the

For example, in the field of mobile communication, when the frequency of the high-frequency signal is 100MHz, when the inner conductor is copper, according to the above formula, the magnetic permeability of copper is μ≈μ ₀ ≈4π×10 ^-7 H/m, The electrical conductivity of copper is σ=5.8×10 ⁷ S/m, so it is determined that the transmission thickness of the inner core layer of the transmission signal is 0.0067mm. When the frequency of the high-frequency signal is 5MHz, when the inner conductor is copper, the transmission The signal transmission thickness of the inner core layer is 0.02996mm. According to the thickness, the thickness of the copper inner conductor can be determined, and according to the total thickness of the inner core layer, the thickness of other metals or metal alloys with a lower density than the inner conductor can be determined, so that the thickness of the inner conductor and other metals with a lower density than the inner conductor can be determined. Or metal alloy to make the inner core layer.

Therefore, it can be seen that when the signal in the coaxial cable is transmitted in the inner conductor, since the signal is generally a high-frequency signal, the inner conductor is generally copper. According to the frequency of the high-frequency signal and the attribute information of the inner conductor copper, the The transmission depth of the high-frequency signal, according to the transmission depth of the high-frequency signal, determines the thickness of the copper in the inner core layer of the coaxial cable. And in order to effectively enhance the stability of the coaxial cable, an alloy of copper and other metals, or copper and other metals is used as the inner core layer in the coaxial cable, wherein the thickness of the copper in the inner layer is determined according to the thickness determined above . the

Wherein, in order to effectively improve the quality of the coaxial cable without affecting the transmission quality of the coaxial cable signal, other metals selected may be metals or metal alloys with a lower density than copper, such as aluminum, titanium, zinc, and the like. As shown in Figure 3, the coaxial cable includes an outer skin layer, an insulating layer, a copper inner core layer, an aluminum inner core layer and an air layer, wherein the outer skin layer is the outermost layer of the coaxial cable, and the air layer is the outermost layer of the coaxial cable. The innermost layer of the coaxial cable, the insulating layer is adjacent to the inner core layer of the outer skin layer, the inner core layer is adjacent to the air layer of the insulating layer, and the copper inner core layer in the inner core layer is located on the outer layer of the inner core layer, and The insulating layers are adjacent, and the inner core layer of metal aluminum whose density is lower than that of copper is located in the inner layer of the inner core layer and adjacent to the air layer. the

In the embodiment of the present invention, since the depth in the transmission process of the high-frequency signal in the coaxial cable determined according to the above formula is known, the depth is generally small, so the inner core layer of the coaxial cable may have a smaller density than copper The depth of the metal or metal alloy can be larger. Preferably, for example, in the inner core layer of the coaxial cable, the depth ratio, or thickness ratio, of copper to other metals or metal alloys with a lower density is 1:3, etc., for example, in the inner core layer, copper and The aluminum thickness ratio is 1:3. the

Of course, it can also be other proportional coefficients, as long as it can ensure that the quality of the high-frequency signal transmitted in the coaxial cable is not affected, the transmission depth of the high-frequency signal in the inner conductor of the coaxial cable is determined according to the above formula, so as to determine the transmission depth of the coaxial cable The thickness of the inner conductor in the inner core layer and other metals or metal alloys with a smaller density than the inner conductor should all be within the protection scope of the present invention. the

Embodiment one:

可知该高频信号在内芯层的铜中的传输深度为0.02119mm。 In the embodiment of the present invention, the inner conductor of the inner core layer of the coaxial cable is copper, and when the frequency of the transmitted high-frequency signal is 15MHz, then according to

It can be seen that the transmission depth of the high-frequency signal in the copper of the inner core layer is 0.02119 mm.

In this coaxial cable, the thickness of the conductor copper in the inner core layer is determined to be 2 mm or the like. the

Alternatively, in this coaxial cable, the inner core layer is made of copper-clad aluminum, and the thickness of copper and aluminum in the inner core layer is determined according to the principle that the thickness of copper and aluminum is 1:3. The thickness of aluminum is used to make the inner core layer, and the outer layer of the inner core layer is made of copper and the inner layer is made of aluminum. the

Embodiment two:

可知该高频信号在内芯层的铜中的传输深度为1.8163×10^-4。 In the embodiment of the present invention, the inner conductor of the inner core layer of the coaxial cable is copper, and when the frequency of the high-frequency signal in the coaxial cable is 1750MHz, then according to

It can be seen that the transmission depth of the high-frequency signal in the copper of the inner core layer is 1.8163×10 ^-4 .

In this coaxial cable, the inner core layer is composed of copper-clad zinc alloy. According to the principle that the thickness of copper and alloy is 1:5, the thickness of copper and zinc alloy in the inner core layer is determined. According to the determined copper and aluminum The thickness of the inner core layer is made, and the outer layer of the inner core layer is made of copper, and the inner layer is made of aluminum. the

When other metals or metal alloys with a lower density than the inner conductor and the inner conductor are used as the inner core layer of the coaxial cable, according to the frequency of the high-frequency signal and the attribute information of the inner conductor, the transmission of the high-frequency signal in the coaxial cable Thickness, so as to determine the thickness of the inner conductor in the inner core layer of the coaxial cable, and the thickness of other metals or metal alloys with a lower density than the inner conductor. In the embodiment of the present invention, we will not go into details one by one. It is believed that those skilled in the art can realize the determination of the inner conductor in the inner core layer and other conductors with a lower density than the inner conductor in the coaxial cable according to the implementation method provided by the embodiment of the present invention. The thickness of a metal or metal alloy. the

When the metal in the inner core layer of the coaxial cable with a lower density than the inner conductor of copper is aluminum, since the price of aluminum is cheaper than that of copper, the weight of the coaxial cable can be reduced, and the cost of purchasing the coaxial cable can be reduced. The investment cost of the cable, thereby reducing the investment cost of the base station engineering construction. the

The embodiments of the present invention provide a coaxial cable and a method for making the coaxial cable. First, it is necessary to determine the first thickness of the copper inner conductor in the inner core layer of the coaxial cable, and according to the inner core of the coaxial cable, the thickness of the layer, and said first thickness, determines a second thickness of a metal or metal alloy having a density less than that of said inner conductor in said inner core layer, the inner core layer is made according to said first thickness and second thickness, And in the inner core layer, an insulating layer and an outer skin layer are sequentially made on the outer layer of the inner conductor. The coaxial cable manufacturing method provided by the embodiment of the present invention can effectively reduce the weight of the coaxial cable without changing the quality of the transmitted signal, reduce the difficulty of fixing and installing the coaxial cable, and facilitate the coaxial cable Cable laying. the

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations. the

Claims (3)

1. A method for making coaxial cable, characterized in that, comprising: determining the first thickness of the copper inner conductor in the inner core layer of the coaxial cable, wherein the first thickness is determined according to the frequency of the transmission signal in the coaxial cable and the attribute information of the inner conductor; Select a metal or metal alloy with a density smaller than that of the inner conductor, and determine the second thickness of the metal or metal alloy according to the thickness of the inner core layer in the coaxial cable and the first thickness, wherein the copper inner the ratio of the first thickness of the conductor to the second thickness of the metal or metal alloy is 1:3; forming an inner core layer according to the first thickness and the second thickness, wherein the inner conductor is located on the outer layer of the metal or metal alloy; The outer layer of the inner conductor in the inner core layer is sequentially made into an insulating layer and an outer skin layer of a coaxial cable. 2. The method of claim 1, wherein the metal having a density less than that of the inner conductor comprises: Aluminum, Zinc or Titanium. 3. The method according to claim 1, wherein the determination of the first thickness according to the frequency of the transmission signal in the coaxial cable and the attribute information of the inner conductor copper includes: according to

Determine the first thickness, where δ is the first thickness of the inner conductor in the inner core layer of the coaxial cable, f is the frequency of the signal transmitted in the coaxial cable, the magnetic permeability of the inner conductor μ, and σ is the electrical conductivity of the inner conductor.

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