Classifications

• • 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

Definitions

• the present invention relates to a coaxial cable.
• the outer conductor is placed on the dielectric layer at a certain angle with respect to the longitudinal axis direction of the coaxial cable in order to improve the shielding effect and reduce the attenuation.
• the applicant of the present invention uses a coaxial cable (see Japanese Patent Application Laid-Open No. 2000-057863) using, as an outer conductor, a metal tape in which a metal such as aluminum or copper is vapor-deposited on an insulating tape or a laminate of these foils.
• a coaxial cable using a plurality of conductive strands is proposed.
• a metal tape serving as an outer conductor is wound from above a dielectric layer, and the metal tape is rotated at 0 to 25 degrees with respect to the longitudinal axis direction of the coaxial cable. Winding at an angle. Then, by winding a metal tape at an angle within a predetermined range, the coaxial cable disclosed in Japanese Patent Laid-Open No. 2000-057863 achieves a sufficient shielding effect and further reduces the attenuation.
• a plurality of conductive strands serving as outer conductors are spirally wound from above a dielectric, and the plurality of conductive strands are connected to each other. It is wound at an angle of 8 degrees to 19 degrees with respect to the longitudinal direction of the coaxial cable.
• a plurality of conductive wires at an angle within a predetermined range.
• a coaxial cable excellent in electrical characteristics such as a shielding effect is provided.
• the present invention has been made in view of the various problems as described above.
• the object of the present invention is to have flexibility and a higher shielding characteristic, to reduce the attenuation, and to reduce the fluctuation thereof.
• an inner conductor a dielectric layer provided on the outer periphery of the inner conductor, an outer conductor layer provided on the outer periphery of the dielectric layer, and the outer conductor
• a band layer is provided, and the wound band layer is wound at a predetermined angle with respect to a longitudinal axis direction of the coaxial cable.
• the winding band is further wound from above the outer conductor layer of the coaxial cable. For this reason, the outer conductor layer is pressed by the winding band, so the outer conductor layer is tightened. As a result, the adhesion of the outer conductor layer is improved and the shielding characteristics are improved. In addition, since the outer conductor is tightened, it becomes difficult to form a gap in the outer conductor layer when the coaxial cable is bent, and it is possible to stably maintain a state in which the shield characteristics are improved.
• the winding band is a metallized tape.
• the wound belt layer becomes a shield layer, two shields of the outer conductor layer and the wound belt layer are provided, and the shield characteristics can be further improved.
• this coaxial cable it is possible to stably maintain a state in which the shield characteristics are improved by closely contacting the wound belt layer and the outer conductor layer.
• the predetermined angle is in a range of 25 degrees to 50 degrees.
• the outer conductor can be tightly tightened by the wound belt layer while maintaining the production efficiency, and the shield characteristics can be improved.
• the outer conductor layer is wound in a single horizontal direction.
• the coaxial cable of the present invention is characterized in that the outer conductor layer is double-rolled horizontally.
• the outer conductor layer is tightened by winding the winding band from above. Therefore, even if the number of outer conductor layers is increased, the present invention can be applied.
• FIG. 1 is a diagram showing a coaxial cable 1 according to an embodiment of the present invention.
• Fig. 2 is the first diagram showing the results of the shield test of coaxial cable 1. The
• FIG. 3 is a second diagram showing the result of the shield test of the coaxial cable 1.
• FIG. 4 is a diagram showing a test method for a winding test of the coaxial cable 1.
• FIG. 5 is a first diagram showing the results of the winding test of the coaxial cable 1.
• FIG. 6 is a second diagram showing the results of the winding test of the coaxial cable 1.
• FIG. 7 is a third diagram showing the results of the winding test of the coaxial cable 1.
• FIG. 8 is a first diagram showing the results of a soldering test of the coaxial cable 1 in which the outer conductor layer is double-sided.
• FIG. 9 is a second diagram showing the results of a winding test of the coaxial cable 1 in which the outer conductor layer is double-side-wrapped.
• FIG. 10 is a third view showing the results of a winding test of the coaxial cable 1 in which the outer conductor layer is double-side wound.
• FIG. 1 (a) is a perspective view of the coaxial cable 1 of the present embodiment
• FIG. 1 (b) is a sectional view of the coaxial cable 1 of the present embodiment
• Fig. 1 (C) shows the winding of the coaxial cable 1 FIG.
• the coaxial cable 1 of the present embodiment is a characteristic part of the present invention, the center conductor 11 (inner conductor), the dielectric layer 12 and the outer conductor layer 13.
• the winding belt layer 14 and the jacket 15 (protective coating layer) are substantially constituted.
• the coaxial cable 1 is formed by the following procedure.
• the coaxial cable 1 is formed by twisting a plurality of conductors 1 1 a to form a center conductor 1 1, and using an extruder (not shown) on the outer periphery of the center conductor 1 1, a dielectric 1 2 a is extrusion coated to form dielectric layer 12. Then, a plurality of conductor strands 13 a are horizontally wound around the outer periphery of the dielectric layer 12 to form the outer conductor layer 13, and the outer periphery of the outer conductor layer 13 is, for example, a conductor strand.
• a metallized tape for example, ALPE T 14 a (winding band) is spirally wound to form a characteristic part of the present invention.
• the jacket 15 is formed by extrusion coating on the outer periphery of the wound belt layer 14. In this way, the coaxial cable 1 is formed.
• the material of the coaxial cable 1 is, for example, a silver-plated annealed copper wire of the conductive wire 1 la, and a material of the dielectric 1 2 a is a tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter simply referred to as FEP). )
• the conductor wire 13a is made of tinned annealed copper wire, and the jacket 15 is made of FEP.
• the material of the coaxial cable 1 of the present embodiment is not limited to the above-described materials, and other materials that are usually used for the coaxial cable can also be used.
• the winding band layer 14 is The direction of rotation may be the same as the direction of horizontal winding of the conductor wire 13 3 a as long as the conductor wire 13 3 a horizontally wound as the outer conductor layer 13 3 is fastened.
• AL PET 14a is formed into a tape by laminating aluminum foil and polyethylene tephrate (hereinafter simply PET) via polyvinyl chloride (hereinafter simply PVC). It is what.
• the A LPET 14 a is wound from above the outer conductor layer 13 in such a manner that the aluminum foil is in contact with the outer conductor layer 13.
• the conductor wire 13a is laid on the outer conductor layer 13 as the outer conductor layer 13.
• the AL PET 14 a forming the wound belt layer 14 is spirally wound at a predetermined angle 0 with respect to the longitudinal axis direction of the coaxial cable 1. Therefore, the outer conductor layer 13 is tightened by applying a desired stress by the wound belt layer 14, and the degree of adhesion between the conductor wires 13 3a of the outer conductor layer 13 is improved. Further, since the plurality of conductor strands 13 a are tightened by the wound belt layer 14, the conductor strips 13 a are kept in close contact with each other by the wound belt layer 14. Even if the coaxial cable 1 is bent, it is possible to prevent the conductor wires 13 a from being separated from each other at the bent portion. Since the wound belt layer 14 is formed of the AL PET 14a, the wound belt layer 14 itself also acts as a shield.
• the coaxial cable 1 according to the present embodiment includes two layers having a shield effect, that is, the outer conductor layer 1 3 and the wound belt layer 14. Further, the outer conductor layer 1 3 Since the conductor wire 1 3 a is tightened by the wound belt layer 14, the adhesion between the conductor wires 1 3 a is improved, and the adhesion state is maintained, and the outer conductor layer is maintained. 1 3 More shield effect It becomes possible to raise.
• Fig. 2 is a table showing the test results of the shield test
• Fig. 3 is a diagram showing the test results of the shield test.
• four coaxial cables 1 with varying predetermined angle 0 for winding the wound belt layer 14 are adjusted to a length of 3 m to be test cables A to D.
• the amount of the signal inserted into cables A to D leaked outside of test cables A to D was measured by an absorption clamp method in which an RF (Radio Frequency) network analyzer was used.
• the inserted signal was sequentially changed from 0 Hz to 1 GHz, and the change in shielding effect was measured during that time.
• a braided coaxial cable used in the past was also tested.
• the configuration of the four test cables A to D used in this shield test is that the central conductor 1 1 is formed by twisting seven silver-plated annealed copper wires having an outer diameter of 0.12 mm.
• the outer periphery of 1 is coated with FEP to form a dielectric layer 12 so that the outer diameter is 0.9 mm.
• the outer diameter of the dielectric layer 12 is equal to the outer diameter of the conductor wire 13 a.
• the outer conductor layer 13 is formed by laying on the cable at an angle of 9.6 degrees with respect to the longitudinal direction of the cable.
• ALPET 14a which is stacked through the same, is wound spirally to form a wound belt layer 14.
• This test cable A to D has an outer diameter of 1, 37 mm.
• the conventional braided coaxial cable has a configuration in which a central conductor is formed by twisting seven silver-plated annealed copper wires with an outer diameter of 0.102 mm and the outer circumference of this central conductor is covered with FEP.
• a dielectric layer is formed so that the outer conductor layer has a thickness of 16 and a braided structure of 6 with an outer diameter of 0.05 mm tinned annealed copper wire on the outer periphery of the dielectric layer.
• This outer conductor layer is formed by extrusion coating a 0.12 mm thick FE P jacket on the outer periphery, and this conventional braided coaxial cable has an outer diameter of 1, 37 mm. Has been.
• test cables A to D each change the angle 0 at which the winding band layer 14 is wound, and the test cable A has the winding band layer 14 with respect to the longitudinal axis direction of the coaxial cable 1.
• Test cable B has a winding band 14 of 25 degrees with respect to the longitudinal direction of the coaxial cable 1
• test cable C has a winding band 14 of 14 with the longitudinal direction of the coaxial cable 1.
• the test cable D is formed by winding the wound belt layer 14 spirally at an angle of 40 degrees with respect to the longitudinal direction of the coaxial cable 1.
• test cables A to D having the characteristic configuration of the coaxial cable 1 of the present embodiment have a higher shielding effect as a whole than the braided type coaxial cable.
• test cable A has a signal of 10 MHz.
• the shielding effect is 1 5 1.7 dB
• the shielding effect is 18.5 dB when the signal is 10 OMH z
• the test cable B has a shielding effect when the signal is 10 MHz—52.
• the shielding effect when the signal is 100 MHz at 5 dB is 49.8 dB
• the test cable C has a shielding effect of 53.4 dB when the signal is 10 MHz.
• the shielding effect at 1 MHz is 50.
• O d B and the test cable D has a shielding effect of 15.5 B when the signal is 10 MHz
• the shielding effect is 1 0 B when the signal is 10 MHz. 51. I d B.
• the coaxial cable 1 of the present embodiment has a higher shielding effect than the conventional coaxial cable, and a higher shielding effect is obtained when the angle 0 for winding the wound belt layer 14 is larger.
• the angle 0 for winding the wound belt layer 14 is preferably 20 degrees or more.
• the width of the ALPET 14 a of the winding band 14 becomes narrower in inverse proportion to the angle 0, so the productivity of the coaxial cable 1 decreases.
• the upper limit of the angle 0 for winding the wound belt layer 14 is 50 degrees in consideration of productivity. Therefore, in the shield test, it can be said that the preferable angle ⁇ for winding the wound belt layer 14 is 20 degrees or more and 50 degrees or less.
• FIG. 4 is a diagram for explaining the test method of the winding test.
• the test method of the winding test will be explained using Fig. 4.
• the test cable is wound around the pipe 20 with an outer diameter of 1 Omm with a spacing of 1 Omm 1 2 times, and two types of signals of 5 GHz and 6 GHz are inserted into this wound test cable. Then, the signal attenuation was measured.
• FIG. 5 is a table showing the test results of the winding test
• Fig. 6 is a diagram showing the relationship between the attenuation amount of the winding test and the angle 0 of the wound belt layer 14
• Fig. 7 FIG. 6 is a diagram showing the relationship between the fluctuation value of the attenuation amount in the winding test and the angle 0 of winding of the wound belt layer 14.
• this winding test the same test was performed on a braided coaxial cable that had been used for comparison.
• the attenuation of the braided coaxial cable is 3.667 dB / m at 5 GHz and 4.0 3 dB at 6 GHz.
• Test cable A to D which has the characteristic configuration of coaxial cable 1.
• the attenuation of test cable A is 3.36 0 dB / m at 5 GHz and 3.6 at 6 GHz.
• test cable B is 5 GH zB temple (3.30 5 dB / m, 3.6 GHz at 6 GHz, 3.6 2 6 dB / m
• the attenuation of one cable C is 3.2 3 3 dB / m at 5 GHz, and 3.5 5 4 dB BZm at 6 GHz
• the attenuation of the test cable D is 3 at 5 GHz. It is 3.5 5 0 d BZm at 1 92 dB and 6 GHz. Therefore, it can be seen that the test cables A to D having the characteristic configuration of the coaxial cable 1 of the present embodiment have an overall reduced attenuation compared to the braided coaxial cable.
• the wound belt layer 14 is wound in a spiral shape at 40 degrees with respect to the longitudinal direction of the coaxial cable.
• Test cable D has the smallest value of attenuation and fluctuation of attenuation, and test cable A and test cable D have a difference of about 0.2 dB / m in attenuation. Arise. Therefore, the coaxial cable of this embodiment As can be seen from Table 1, the amount of attenuation is lower than that of a conventional coaxial cable, and the amount of attenuation is further reduced by increasing the angle ⁇ for winding the wound belt layer 14.
• the difference between the attenuation of test cable C and the attenuation of test cable D is about 0.04 d ⁇ ⁇ , and the difference is small, and the fluctuation in attenuation is almost the same at 6 GHz. It's gone. From this, the attenuation can be reduced by the fact that when the angle ⁇ of winding of the wound belt layer 14 exceeds 30 degrees, the change in attenuation is almost flat. It turns out that it becomes a peak. Therefore, even if the angle ⁇ for winding the wound belt layer 14 is 40 degrees or more, the attenuation value does not change greatly, and it is thought that a good state can be maintained. To do. As described in the result of the shield test, the angle 0 for winding the wound belt layer 14 has an upper limit of 50 degrees in consideration of productivity.
• the winding angle ⁇ of 4 is about 25 degrees.
• the angle 0 for winding the wound belt layer 14 is a lower limit of 25 degrees, and 50 degrees is the J limit. Then, when the amount of attenuation and productivity are taken into account, the changing force S of the amount of attenuation S is almost flat. 30 ° or more and 40 ° or less is the most preferable angle for winding the wound belt layer 14 You can say that.
• a winding test using another test cable will be described in detail with reference to FIG. 8 to FIG.
• Fig. 8 is a table showing the test results of the winding test using different test cables F to H
• Fig. 9 is the attenuation and winding band of the winding test using different test cables F to H.
• Fig. 10 shows the relationship between the wound angle 0 of layer 14 and Fig. 10 shows the fluctuation value of the amount of attenuation in the winding test using different test cables F to H and the winding. It is a figure which shows the relationship with the wound angle ⁇ of the belt layer 14.
• the configuration of the three test cables F to H used in this winding test is that the central conductor 1 1 is formed by twisting seven silver-plated annealed copper wires with an outer diameter of 0.079 mm.
• a dielectric layer 12 is formed on the outer periphery of FEP so as to have an outer diameter of 0.7 mm, and tin with an outer diameter of 0.05 mm corresponding to the conductor wire 1 3 a is formed on the outer periphery of the dielectric layer 12
• the outer conductor layer 1 3 is formed by laying double laying on the 9 pcs of annealed copper wire at an angle of 8.3 degrees with respect to the longitudinal axis direction of the coaxial cable.
• a spiral belt layer 14 is formed by spirally winding AL PET 14a, which is laminated through a wire, and a jacket made of 0.12m thick FEP is formed on the outer periphery of the wound belt layer 14. 15 is formed by extrusion coating.
• the outer diameters of the test cables F to H are 1, 13 mm.
• test cables F to H are respectively changed in the angle ⁇ for winding the wound belt layer 14, and the test cable F is arranged so that the wound belt layer 14 is aligned with the longitudinal direction of the coaxial cable.
• test cable G has a winding band 14 of 25 degrees with respect to the longitudinal axis of the coaxial cable
• test cable H has a winding band 14 of 32 with respect to the longitudinal axis of the coaxial cable.
• the comparative test cable ⁇ ⁇ used in the attenuation test is one in which the wound cable layer 14 is not provided in the test cables F to H.
• the attenuation of the comparative test cable E is 4.940 d B / at 5 GHz and 5.58 d BZm at 6 GHz.
• the attenuation of the test cable F is 4.21 dBZm at 5 GHz and 4.65 dB / m at 6 GHz.
• Cable G The attenuation is 4, 11 dB B Zm at 5 GH z B, 4.5 3 dB B Zm at 6 GHz, and the attenuation of test cable H is 4.0 5 dB at 5 GHz. It is 4.45 dBB Zm at Zm and 6 GHz.
• test cables F to H having the characteristic configuration of the coaxial cable 1 of the present embodiment have a reduced attenuation as a whole as compared with the comparative test cable E.
• the wound belt layer 14 is spirally wound with 3 2 in the longitudinal direction of the coaxial cable.
• the rotating test cable H has the smallest amount of attenuation and variation in attenuation.
• the test cable F and the test cable H have about 0.2 dB Bm of attenuation. The difference occurs.
• the coaxial cable 1 of the present embodiment has a reduced attenuation compared to the conventional coaxial cable, and even when the outer conductor layer 13 is double-sided, the winding band layer 1 Rotate 4 It turns out that the amount of attenuation decreases more when angle ⁇ is increased.
• the difference between the attenuation of test cable G and the attenuation of test cable H is about 0.06 dBB Zm, and the difference is small. There is almost no difference with cable H. From this, the attenuation is reduced because the change in attenuation is almost flat when the winding angle ⁇ is between 25 and 3 2 degrees, in other words, about 30 degrees. It can be seen that it reaches a certain level at about 30 degrees. Therefore, even if the angle ⁇ for winding the wound belt layer 14 is 32 degrees or more, the attenuation value does not change greatly, and it is thought that the good state can be maintained. . And as described in the results of the shield test, the angle ⁇ for winding the wound belt layer 14 has an upper limit of 50 degrees in consideration of productivity.
• the attenuation is greatly improved as compared with the conventional one.
• the winding zone layer 14 turns Angle 0 is about 25 degrees.
• the lower limit of the angle 0 for winding the wound belt layer 14 is 25 degrees, and the upper limit is 50 degrees.
• the change in attenuation is almost flat. 30 degrees or more and 40 degrees or less are the most preferable angle for winding the wound belt layer 14. It can be said.
• the range of the predetermined angle ⁇ for winding the wound belt layer 14 is 25 degrees from the required attenuation value, and the upper limit is 50 degrees from the viewpoint of productivity. It becomes.
• the most preferable angle for winding the wound belt layer 14 is 30 degrees or more and 40 degrees or less.
• the shielding effect is further improved and the attenuation is further reduced.
• the angle ⁇ for winding the wound belt layer 14 is increased, the force of tightening the outer conductor layer 1 3 by the corresponding wound belt layer 14 increases, so the conductor of the outer conductor layer 1 3 This is because the degree of adhesion between the strands 1 3 a is improved accordingly. If the close contact between the conductor wires 1 3 a is improved, it becomes difficult to form a gap between the conductor wires 1 3 a. Therefore, it becomes possible to prevent the shield effect from being reduced due to a gap between the conductor wires 1 3 a, and the shield effect is improved. Further, since the wound belt layer 14 is formed of ALPET 14a, the wound belt layer 14 itself also acts as a shield.
• the coaxial cable 1 of the present embodiment includes two layers having a shielding effect, that is, the outer conductor layer 13 and the wound band layer 14.
• the conductor wire 1 3 a of the outer conductor layer i 3 is fastened by the wound belt layer 14, the degree of adhesion between the conductor wires 1 3 a can be improved and the adhesion state can be maintained.
• the shielding effect of the outer conductor layer 13 can be further increased, and the attenuation can be further reduced.
• the wound belt layer 14 has been formed of ALPET 14a which is a metallized tape, but the wound belt layer of the present invention is not limited to this.
• any material can be used as long as the outer conductor layer can be tightened.
• the coaxial cable of the present invention can be applied to any device.
• it can be applied to electronic devices such as computers, computers, and mobile phones, and it can also be applied to control circuits for machines that need to be equipped with control devices such as automobiles and airplanes in narrow spaces.

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Citations (8)

• 2007
  • 2007-01-15 JP JP2007006320A patent/JP2008171778A/ja active Pending
  • 2007-12-19 TW TW096148630A patent/TW200837778A/zh unknown
• 2008
  • 2008-01-08 KR KR1020097013781A patent/KR20090105922A/ko not_active Application Discontinuation
  • 2008-01-08 CN CNA2008800021782A patent/CN101601104A/zh active Pending
  • 2008-01-08 WO PCT/JP2008/050310 patent/WO2008087919A1/ja active Application Filing

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