JP2005175792A - Connecting device for adjusting high-frequency coaxial cable phase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting device for adjusting high-frequency coaxial cable phase that facilitates a method for changing the length of a high-frequency coaxial cable and shortens working time from the measurement in the radiation direction of a transmission antenna to the adjustment in the radiation direction. <P>SOLUTION: In the connecting device 1 for connecting a connector 44 for feeder lines to which a high-frequency coaxial feeder line is connected to a connector 43 for cables to which a high-frequency coaxial cable 42 is connected, there are provided: a center conductor 2; insulators 3a, 3b provided at one portion of the outer periphery of the center conductor 2; and an external conductor 4 that is provided at the outer periphery of the insulators 3a, 3b and has axial length corresponding to a phase in which a cable 42 is adjusted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connection device for phase adjustment of a high-frequency coaxial cable or a high-frequency coaxial feed line.

  In the transmission antenna system 61 as shown in FIG. 5, the radio wave (power supply signal) transmitted from the transmitter 62 is distributed by the power supply component such as the distributor 64 through the main power supply line 63, and a plurality of signals are supplied by a plurality of branch cables 65. Each of the transmission antennas 66 is fed. The branch cable 65 is a cable for transmitting the radio wave distributed by the distributor 64 to each transmission antenna 66 when supplying power to the plurality of transmission antennas 66 in the transmission antenna system 61.

  In the transmission antenna system 61, the radiation direction is adjusted by synthesizing radio waves radiated from the plurality of transmission antennas 66. At this time, the individual transmission antennas 66 may be fed with a specific phase difference. . In this case, the feeding phase to each transmitting antenna 66 is adjusted based on the difference in electrical length of the branch cable 65.

Conventionally, when the transmission antenna system 61 is installed, the radiation direction when the radio waves radiated from the plurality of transmission antennas 66 are synthesized in advance is measured, and each branch cable is connected to each cable connecting portion 67 as necessary. The radial direction is adjusted by changing the length of 65.
As a method of changing the length of the branch cable 65, a method of calculating from the measurement result and shortening the length of the cable connected to the specific transmitting antenna 66, or preparing many cables having different lengths is prepared. There is a way to replace the cable.

  Here, it is assumed that the distributor 64 and each cable connection portion 67 are connected by a high-frequency coaxial feed line, and each cable connection portion 67 and each transmission antenna 66 are connected by a high-frequency flexible coaxial cable.

  As shown in FIG. 4, each cable connecting portion 67 constitutes a part of a power feeding component and a cable connector 43 to which a high frequency flexible coaxial cable 42 is connected, and a high frequency coaxial power feeding line (not shown) is connected thereto. The power supply line connector 44 is connected via a connection device (anchor connector) 41.

  The cable connector 43 is connected to the coaxial cable 42 at the other end and is provided with a standardized outer connection flange 45a at one end. A female inner connection flange 46a is provided inside the outer connection flange 45a. Similarly, the feeder connector 44 is connected to the coaxial feeder at the other end and is provided with a standardized outer connection flange 45b at one end. A female inner connection flange 46b is provided inside the outer connection flange 45b. The connection device 41 includes a center conductor 47 and an insulator 48 provided on a part of the outer periphery of the center conductor 47.

  The assembly of the cable connecting portion 67 is performed by connecting the coaxial cable 42 whose length is appropriately adjusted to the cable connector 43, and connecting the end face of the outer connection flange 45 a of the cable connector 43 to the coaxial power supply line. The end face of the outer connection flange 45b 44 is brought into contact with each other via a connection device 41 and a rubber packing 49 that keeps airtightness in the coaxial pipe, and connected by using a plurality of bolts 50, washers 51, and nuts 52. At this time, the insulator 48 of the connection device 41 is fitted to the inner connection flanges 46a and 46b, and the center line m indicated by a dotted line in FIG. 4 coincides with the abutting surface of the outer connection flanges 45a and 45b.

  The prior art document information related to the invention of this application includes the following.

JP-A-5-326076 JP 2003-7406 A Japanese Patent Laid-Open No. 9-238006

  However, among the methods of changing the length of the branch cable 65 described in FIG. 5 (the coaxial cable 42 in FIG. 4), the method of shortening the cable length requires reattachment of the cable connector 43. The work process is increased by the amount of the connector mounting work, and the work time becomes longer.

  In addition, the degree of skill is required for the connector mounting operation of the coaxial cable 42, and it is necessary for a specific operator with experience to perform it. This is also due to the fact that the length of the coaxial cable 42 may be adjusted within a few millimeters.

  On the other hand, the method of preparing a large number of cables with different lengths and exchanging the cables requires many cables that are not used for the antenna that is actually installed, which is costly and labor-intensive. is there. Also in this case, it is necessary to reattach the cable connector 43, and the number of work steps increases by the amount of the connector mounting work, and the work time becomes longer.

  Therefore, an object of the present invention is to provide a high-frequency coaxial cable phase adjustment connecting device that facilitates a method of changing the length of a high-frequency coaxial cable and shortens the work time from measurement of the radiation direction of the transmitting antenna to adjustment of the radiation direction. It is to provide.

  The present invention was devised to achieve the above object, and the invention of claim 1 includes a power line connector to which a high frequency coaxial power line is connected and a cable connector to which a high frequency coaxial cable is connected. In the connecting device to be connected, a central conductor, an insulator provided on a part of the outer periphery of the central conductor, and an axial length corresponding to a phase to which the cable is adjusted are provided on the outer periphery of the insulator. A connection device for phase adjustment of a high-frequency coaxial cable provided with an outer conductor.

  According to a second aspect of the present invention, there is provided the high frequency coaxial cable phase adjusting connecting device according to the first aspect, wherein the insulator is divided into an insulator on the feeder connector side and an insulator on the cable connector side. It is.

  According to a third aspect of the present invention, there is provided the high-frequency coaxial cable phase according to the first or second aspect, wherein connection flanges connected to the feeder line connector end and the cable connector end are provided on both sides of the outer conductor, respectively. It is a connection device for adjustment.

  The invention according to claim 4 is the high-frequency coaxial cable phase adjustment connecting device according to any one of claims 1 to 3, wherein the center conductor, the insulator, and the outer conductor are symmetrical on both sides.

  According to the present invention, it is possible to easily adjust the feeding phase of the high-frequency coaxial cable without reattaching the cable connector or replacing the cable, and to reduce the work time from measuring the radiation direction of the transmitting antenna to adjusting the radiation direction. It has an excellent effect that it can be shortened.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  First, a transmission antenna system using the high-frequency coaxial cable phase adjustment connecting device according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, the transmission antenna system 31 has substantially the same configuration as the transmission system 61 of FIG. 5, and includes a main feed line 32 that transmits a radio wave (feed signal) sent from a transmitter (not shown), and a feed component. Of the power supply signal from the main power supply line 32, the branch cables 34a to 34d for transmitting the power supply signal distributed by the distributor 33, and the branch cables 34a to 34d, respectively. It is mainly comprised by the transmitting antennas 35a-35d connected.

  Cable connecting portions 36a to 36d are provided in the middle of the branch cables 34a to 34d. In the present embodiment, the distributor 33 and the cable connecting portions 36a to 36d are connected by high-frequency coaxial feeders, and the cable connecting portions 36a to 36d and the transmitting antennas 35a to 35d are connected by high-frequency flexible coaxial cables. did.

  In the transmission antenna system 31, when only the feeding phase of the transmission antenna 35a is delayed, for example, among the transmission antennas 35a to 35d, the high frequency coaxial cable phase adjustment connecting device 1 according to the present embodiment is incorporated, and the cable connection portion 36a. Configure. Each cable connection part 36b-36d is the same structure as the cable connection part 67 of FIG.

  FIG. 1 is a partial cross-sectional view of a cable connecting portion using a high-frequency coaxial cable phase adjusting connecting device showing a preferred embodiment of the present invention.

  As shown in FIG. 1, the cable connecting portion 36a constitutes a part of a power feeding component and a cable connector 43 to which a high frequency flexible coaxial cable 42 is connected, and a high frequency coaxial power feeding line (not shown) is connected thereto. A power line connector 44 is connected via the connection device 1. That is, the cable connection portion 36a is obtained by using the connection device 1 in place of the connection device 41 in the cable connection portion 67 of FIG.

  The cable connector 43 is connected to the coaxial cable 42 at the other end and is provided with a standardized outer connection flange 45a at one end. A female inner connection flange (concave portion) 46a is provided inside the outer connection flange 45a. Similarly, the feeder connector 44 is connected to the coaxial feeder at the other end and is provided with a standardized outer connection flange 45b at one end. A female inner connection flange 46b (concave portion) is provided inside the outer connection flange 45b. The inner connection flanges 46a and 46b have the same shape.

  As shown in FIGS. 1 and 2, the high-frequency coaxial cable phase adjusting connection device 1 according to the present embodiment includes a substantially cylindrical center conductor 2 and a cable connector provided at the center of the outer periphery of the center conductor 2. A ring-shaped insulator 3a on the 43 side, a ring-shaped insulator 3b on the feeder connector 44 side provided in the center of the outer periphery of the center conductor 2, and a coaxial on the outer periphery of these insulators 3a and 3b. The cable 42 includes a ring-shaped outer conductor 4 having an axial length L corresponding to the phase to be adjusted.

  In the present embodiment, standard parts having the same dimensions as the insulator 48 of FIG. 4 are used as the insulators 3a and 3b. Further, as the material of the insulators 3a and 3b, a material excellent in electrical characteristics, heat resistance, water resistance, and chemical resistance, for example, Teflon (registered trademark) was used.

  A male inner connection flange 5a is provided on one end surface 4a of the outer conductor 4 on the cable connector 43 side so as to be fitted and connected to the inner connection flange 46a of the cable connector 43. A male inner connection flange 5b is provided on the other end surface 4b of the outer conductor 4 on the power supply line connector 44 side and fitted and connected to the inner connection flange 46b of the power supply line connector 44. The inner connection flanges 5a and 5b have the same shape.

  In the inner connection flange 5 a and a part of the outer conductor 4, a space 6 is defined by the outer peripheral surface of the center conductor 2, the insulators 3 a and 3 b, and the inner peripheral surface of the outer conductor 4. The insulator 3a is accommodated, and the insulator 3b is accommodated in a part of the inner connection flange 5b and the outer conductor 4.

  The connection device 1, that is, the center conductor 2, the insulators 3a and 3b, the outer conductor 4, and the inner connection flanges 5a and 5b are bilaterally symmetric on both sides of the cable connector 43 side and the feeder connector 44 side. And symmetric with respect to the center line indicated by the alternate long and short dash line in FIG.

  The connection device 1 is formed so as to be impedance-matched to the coaxial cable 42, the cable connector 43, the feeder connector 44, and the coaxial feeder in order to prevent reflection of the feeding signal. Impedance matching is performed by adjusting the outer diameter φi of the center conductor 2 and the outer diameter φo of the outer conductor 4.

  In the present embodiment, the outer diameter φi of the center conductor 2 is made the same as the outer diameter of the center conductor 47 of FIG. 4, and the outer diameter φo of the outer conductor 4 is made the same as the outer diameter of the outer connection flanges 45a and 45b.

  The operation of the present embodiment will be described.

  A plurality of types of connection devices 1 having different lengths L in the axial direction of the external conductor 4 are prepared in advance. First, after the transmission antenna system 31 of FIG. 3 is installed, the radiation direction is measured when the radio waves radiated from the plurality of transmission antennas 35a to 35d are combined. As a result of the measurement, for example, the radiation direction of the plurality of transmission antennas 35a to 35d is adjusted by delaying the feeding phase of only the transmission antenna 35a. In other words, it is necessary to increase the length of the coaxial cable 42 (or the coaxial feeder) connected to the transmission antenna 35a.

  Based on this measurement result, the connection device 1 having the optimum length L is selected from a plurality of types of connection devices 1 prepared in advance, and only the connection portions of the outer connection flanges 45a and 45b are disassembled, and the selected connection is selected. The device 1 and the already-connected connecting device are exchanged, and the cable connecting portion 36a of FIG. 1 is assembled.

  The cable connecting portion 36a is assembled by rubber packing that keeps the end face of the outer connection flange 45a of the cable connector 43 to which the coaxial cable 42 is connected and the one end face 4a of the outer conductor 4 of the connecting device 1 in a coaxial tube. 49, and the end face of the outer connection flange 45b of the power supply line connector 44 to which the coaxial power supply line is connected, and the other end face 4b of the outer conductor 4 of the connection device 1 are put together via the rubber packing 49. The plurality of bolts 50, washers 51, and nuts 52 are used for connection. At this time, the inner connection flanges 5a and 5b provided on both sides of the outer conductor 4 of the connection device 1 are fitted into the inner connection flanges 46a and 46b, respectively.

  Thus, the axial length of the outer conductor 4 is longer than that of the original coaxial cable 42 by connecting the coaxial cable 42 that needs to be increased in length and the coaxial feeder using the connection device 1. This is equivalent to feeding power to the transmitting antenna 35a using a coaxial cable that is longer by L. That is, the feeding phase to the transmitting antenna 35a (the feeding phase of the coaxial cable 42) can be delayed by a phase corresponding to the length L, and the radiation directions of the plurality of transmitting antennas 35a to 35d can be adjusted.

  In other words, the feeding phase to the transmission antenna 35a can be adjusted so that the coaxial cable 42 is lengthened by the length L in the longitudinal direction. At this time, the electrical length (electrical length) to be phase-adjusted is proportional to the length L, and is determined by the frequency of the feed signal and the total dielectric constant of the insulators 3a and 3b of the connection device 1.

  Accordingly, only the connecting portions of the outer connecting flanges 45a and 45b are disassembled, and the cable using the connecting device 1 having the optimum length is selected from the plural types of connecting devices 1 having different lengths L in the axial direction of the outer conductor 4. By assembling the connecting portion 36a, the feeding phase of the coaxial cable 42 can be easily adjusted without reattaching the cable connector 43 or exchanging the coaxial cable 42. From the measurement of the radiation directions of the transmission antennas 35a to 35d, the radiation direction The work time until adjustment is reduced.

  Since the insulator of the connection device 1 is divided into the insulator 3a on the cable connector 43 side and the insulator 3b on the feeder connector 44 side, Teflon is expensive as a material for the insulators 3a and 3b. Even if (Registered Trademark) is used, the connecting device 1 becomes low cost. In addition, standard parts having the same dimensions as existing ones (for example, the insulator 48 in FIG. 4) can be used.

  Further, since the connection device 1 is provided with the inner connection flanges 5a and 5b having the same shape on both sides of the outer conductor 4, the cable is similarly applied to both the cable connector 43 direction and the feeder connector 44 direction. It can be connected to the outer connection flange 45 a of the connector 43 for power supply and the outer connection flange 45 b of the connector 44 for power supply line.

  Further, the connection device 1, that is, the central conductor 2, the insulators 3a and 3b, the outer conductor 4, and the inner connection flanges 5a and 5b are symmetrical on both sides of the cable connector 43 side and the feeder connector 44 side. Even if the direction is changed, the same connection can be obtained mechanically and electrically.

  The connecting device 1 can be easily applied to the sizes of other standardized outer connecting flanges 45a and 45b.

  In the above-described embodiment, the example in which the connection device 1 is used for the connection portion of the branch cable of the transmission antenna system 31 and the phase of the branch cable is adjusted has been described, but power is supplied to the transmission antenna using a plurality of main feed lines. It is also possible to apply to a transmission antenna system that performs the above.

It is a fragmentary sectional view which shows an example of the cable connection part using the connection apparatus for high frequency coaxial cable phase adjustment which shows suitable embodiment of this invention. FIG. 2 is an enlarged partial cross-sectional view of the connection device shown in FIG. 1. FIG. 2 is a feed system diagram illustrating an example of a transmission antenna system using the connection device illustrated in FIG. 1. It is a fragmentary cross-sectional view which shows an example of the cable connection part using the connection apparatus of background art. FIG. 5 is a feed system diagram illustrating an example of a transmission antenna system using the connection device illustrated in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency coaxial cable phase adjustment connection apparatus 2 Center conductors 3a and 3b Insulator 4 Outer conductor 42 High frequency flexible coaxial cable 43 Cable connector 44 Feed line connector

Claims (4)

  In a connection device that connects a power line connector to which a high-frequency coaxial power line is connected and a cable connector to which a high-frequency coaxial cable is connected, a center conductor, an insulator provided on a part of the outer periphery of the center conductor, A high-frequency coaxial cable phase adjusting connecting device comprising an outer conductor provided on an outer periphery of the insulator and having an axial length corresponding to a phase to which the cable is adjusted.   The high-frequency coaxial cable phase adjustment connecting device according to claim 1, wherein the insulator is divided into an insulator on the feeder connector side and an insulator on the cable connector side.   The high-frequency coaxial cable phase adjustment connecting device according to claim 1 or 2, wherein connection flanges connected to the end portions of the feeder connector and the cable connector are provided on both sides of the outer conductor. The high-frequency coaxial cable phase adjustment connecting device according to any one of claims 1 to 3, wherein the center conductor, the insulator, and the outer conductor are symmetrical on both sides.

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