KR102758197B1 - Coaxial cable assembly - Google Patents

Abstract

The present invention relates to a coaxial cable assembly that can minimize damage to a coaxial cable caused by birds or the like, improve watertightness during outdoor installation, and improve workability during connection work at a base station.

Description

COAXIAL CABLE ASSEMBLY

The present invention relates to a coaxial cable assembly. More specifically, the present invention relates to a coaxial cable assembly that can minimize damage to a coaxial cable caused by birds or the like, and improve watertightness during outdoor installation and workability during connection work at a base station.

In the case of conventional mobile communications, a communication signal is transmitted from a telecommunications company's base station to a base station, and an RF signal transmitted from the BTS (Base Transceiver Station) of the base station is wirelessly transmitted via the base station antenna. In addition, a wireless signal transmitted from a user's mobile terminal is received by the base station antenna, and the received signal is amplified via a TMA (Tower Mount Amplifier) and transmitted to the BTS.

At this time, the BTS, TMA, and antenna of the base station are connected by a coaxial feed line, but the coaxial feed line has a large signal loss as the cable length increases. When the antenna is installed on a base station tower that is tens of meters high, the loss increases in the coaxial feed line connecting the ground base station and the antenna, and the signal provided from the base station does not reach the signal intensity required by the antenna and is attenuated due to the signal loss of the coaxial feed line, so a TMA is installed to compensate for and amplify this.

However, since the TMA consumes relatively much power to amplify the signal, it entails a problem in that it requires a lot of maintenance costs and its efficiency is low when viewed from the perspective of the overall system.

Meanwhile, base station facilities are also evolving with the evolution of FTTx (Fiber to the X) and miniaturization of relay equipment. Among these, optical units are characterized by lower signal attenuation according to cable length compared to coaxial cables. By applying this advantage, RRH (Remote Radio Head), a technology that transmits optical signals to just before the base station antenna to minimize signal loss and converts optical signals into RF signals that can be radiated just before the antenna, has emerged.

RRH is a solution to the power consumption and maintenance inefficiency of conventional mobile communication base stations using TMA. RRH separates the RRU (Remote RF Unit) from the conventional BTS and places it under the antenna of the base station tower and remotely controls it.

Here, the remaining parts of the existing BTS, i.e., the BBU (Baseband Unit) and PSU (Power Supply Unit), from which the RRU is separated from the RRH, are connected to the RRU by an optical-electrical hybrid cable including an optical unit and a power unit with almost no attenuation per length, so that communication signals from the BBU and PSU are supplied to the RRU through the optical unit constituting the optical-electrical hybrid cable, and power is supplied to the RRU through the power unit constituting the optical-electrical hybrid cable.

In these RRH systems, the BBU, PSU, and RRU are branched and connected via terminal boxes for optical-electrical composite cables.

Since these RRUs can be installed directly underneath the base station antenna on the top of the base station tower, the length of the coaxial cable for supplying the signal converted into an RF signal by the RRU to the antenna is minimized, so RF signal attenuation that occurs when transmitting RF signals through the coaxial cable does not become a problem, the amount of signal attenuation right before radiation is minimized, and the need for the TMA that previously consumed a lot of power is eliminated. This technical feature has become a special advantage of the RRH in terms of base station maintenance.

In these RRH base station systems, the base station antenna is mounted so as to protrude at the top of the tower, and the coaxial cable connecting the antenna and the RRU on the top of the base station tower is easily exposed to birds and may be damaged by birds' beaks, etc. In addition, the coaxial cable for connecting the antenna and the RRU is connected to the antenna and the RRU respectively in a connector manner, and when it rains, moisture may penetrate into the antenna, RRU, or coaxial cable through the connector connection part.

In this way, if a failure or corrosion occurs due to physical damage or moisture intrusion of the coaxial cable connecting the antenna and RRU at the top of the base station tower, workers must approach the top of the base station tower to perform the work, which may result in poor workability and increased maintenance and repair costs and risks.

The present invention aims to solve the problem of providing a coaxial cable assembly that can minimize damage to coaxial cables caused by birds, etc., and improve watertightness during outdoor installation and workability during connection work at a base station.

In order to solve the above problem, the present invention can provide a coaxial cable assembly comprising: a coaxial cable; a coaxial connector connected to both ends of the coaxial cable; a cable protection tube wrapping the outside of the coaxial cable so as to expose an end area of a predetermined range of the coaxial cable to prevent damage to the coaxial cable; a flexible pipe-shaped sealing member for sealing a connection portion of the coaxial connector and a corresponding connector connected to the coaxial connector; and a protective cap for receiving and closing the sealing member in the direction of the corresponding connector after mounting the sealing member.

In addition, it may include a heat shrink tube that wraps and finishes the connection portion of the coaxial connector connected to both ends of the coaxial cable from the area of both ends of the cable protection tube.

In addition, the sealing member is provided with an inlet and an outlet at both ends, and the inner diameter of the inlet and outlet can be reduced to be smaller than the outer diameter of the coaxial cable equipped with the heat shrink tube.

Here, an expansion member with an enlarged inner diameter may be provided between the inlet and outlet of the sealing member to accommodate the connection portions of the coaxial connector and the corresponding connector.

In this case, the expansion portion of the sealing member may be provided closer to the outlet in the direction of the coaxial connector among the inlet and the outlet.

Additionally, the inner diameter of the outlet of the sealing member may be larger than the inner diameter of the inlet.

In addition, a plurality of anti-slip protruding ribs may be provided in the circumferential direction of an area other than the expansion portion of the sealing member.

Here, at least one engaging groove may be provided on the inner surface of the protective cap to engage and fix at least one protruding rib provided on the sealing member.

In this case, the sealing member is provided with a plurality of ring-shaped protruding ribs, and when the protective cap is mounted while surrounding the sealing member, a protruding rib closer to the inlet side among the plurality of protruding ribs can be seated in the engaging groove.

In addition, when the outer surface of the sealing member is pressed so that the empty space inside the sealing member is removed and contracted while the sealing member is installed, the contracted state of the sealing member can be maintained.

Additionally, the above coaxial cable assembly can connect an RRU and an antenna in a RRH type base station system.

In addition, in order to solve the above problem, the present invention can provide an RRH type base station system, including: a terminal box to which at least one photoelectric hybrid cable including a plurality of power units and a plurality of optical units for supplying power and data from a ground PSU and a BBU is connected and branched; an RRU connected to the terminal box by a jumper cable including at least one power unit and at least one unit; an antenna for transmitting and receiving an RF signal with the RRU; and the above-described coaxial cable assembly for connecting the RRU and the antenna.

According to the coaxial cable assembly according to the present invention, damage to the coaxial cable can be minimized or prevented by providing a cable protection tube that is not damaged even by bird attacks even when installed on the top of a base station tower.

In addition, according to the coaxial cable assembly according to the present invention, a sealing member for sealing the connector connection part during outdoor installation can be provided to minimize equipment failure or corrosion due to moisture penetration.

In addition, according to the coaxial cable assembly according to the present invention, the work of mounting a sealing member for sealing a connector connection portion, etc. and a protective cap for protecting the exterior thereof can be performed without a separate tool, and workability in a base station tower can be improved by mounting the sealing member by pressing it into the inside of the protective cap.

FIG. 1 illustrates a configuration diagram of a base station having a coaxial cable assembly installed according to one embodiment of the present invention.
Figure 2 illustrates a cross-sectional view of an optoelectronic composite cable introduced into a terminal box for an optoelectronic composite cable and branched or connected.
FIG. 3 is a close-up perspective view of the connection state of a coaxial cable assembly connecting an antenna and an RRU of an RRH system according to the present invention.
Figure 4 illustrates a coaxial cable assembly according to the present invention.
Figures 5 to 8 illustrate a process of connecting a coaxial cable assembly according to the present invention to an antenna.
FIGS. 9 and 10 illustrate side and cross-sectional views of a sealing member constituting a coaxial cable assembly according to the present invention.
Figure 11 is a cross-sectional view showing the mounting state of the sealing member and the cap member constituting the coaxial cable assembly according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed contents can be thorough and complete, and so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Like reference numerals represent like elements throughout the specification.

FIG. 1 illustrates a configuration diagram of a base station having a coaxial cable assembly installed according to one embodiment of the present invention.

Referring to Fig. 1, the RRH type base station system (1) separates the RRU (40) from the conventional BTS type base station and places it under the antenna (20) of the base station installation tower and remotely controls it.

Here, in the base station system (1) of the RRH type, the remaining part (10) of the existing BTS type base station from which the RRU (40) is separated, i.e., the BBU and PSU and the RRU, is connected by an optical-electrical composite cable (100) including an optical unit and a power unit with almost no attenuation per length.

Communication signals from the BBU and PSU are supplied to the RRU (40) through an optical unit (130) constituting the optical-electrical composite cable (100), and power is supplied to the RRU (40) through a power unit (110) constituting the optical-electrical composite cable (100).

Since the RRU (40) described above can be installed directly below the base station antenna (20) on the top of the base station tower, the length of the coaxial cable assembly (30) according to the present invention for supplying the signal converted into an RF signal from the RRU (40) to the antenna (20) is minimized, so that RF signal attenuation that may occur when transmitting an RF signal through the coaxial cable assembly (30) according to the present invention is not a problem, and thus the amount of signal attenuation up to just before radiation is minimized, and the TMA that previously consumed a lot of power is not required. This technical feature has become a special advantage of the RRH in terms of base station maintenance.

As mentioned above, in the event of a failure or corrosion of the coaxial cable connecting the antenna and the RRU at the top of the tower due to physical damage or moisture infiltration, etc., the RRH base station system may have poor workability and increased maintenance and repair costs and risks because workers must approach the top of the base station tower to perform work.

Therefore, the RRH type base station system (1) according to the present invention uses a coaxial cable assembly (30) of a new structure, rather than a conventional coaxial cable, as a connecting means for connecting the base station antenna and the RRU, thereby minimizing damage caused by birds and moisture infiltration. The detailed structure of the coaxial cable assembly (30) according to the present invention will be described later with reference to FIG. 3 and below.

As shown in Fig. 1, the base station system (1) of this RRH method is composed of a BBU and a PSU, a part (10) and an optical-electrical composite cable (1000) are connected via a terminal box (1200) for the optical-electrical composite cable.

The optical unit (130, see FIG. 2) of the above-mentioned photoelectric composite cable (100) is connected to the BBU side, and the power unit (110, see FIG. 2) is connected to the PSU side.

That is, the photoelectric composite cable (100) is a cable in which a plurality of optical units and power units are connected, and a portion (10) consisting of a BBU and a PSU and a plurality of RRUs of various shapes installed in a single base station tower cannot be directly connected, and each optical unit and power unit constituting the photoelectric composite cable (100) may be branched from a terminal box (1200) for the photoelectric composite cable and then connected to each RRU (40) via a jumper cable (50).

Figure 2 illustrates a cross-sectional view of an optoelectronic composite cable introduced into a terminal box for an optoelectronic composite cable and branched or connected.

Referring to FIG. 2, the photoelectric composite cable (100) may be composed of a cable core (105) and an outer layer (150) surrounding the cable core (105).

The above cable core (105) may be equipped with multiple power units (110) for supplying power and multiple optical units (130) for transmitting optical signals.

A central tension line (145) may be arranged at the center of the above-mentioned photoelectric composite cable (100), and a plurality of optical units (130) may be arranged around the central tension line (145) in the longitudinal direction of the photoelectric composite cable.

Additionally, a protective layer (140) for protecting the optical unit (130) may be further provided on the outside of the plurality of optical unit (130) layers.

The optical unit (130) may be configured in any form that includes an optical fiber for transmitting an optical signal, and may include, for example, an optical fiber (133) having at least one core and a tube (135) surrounding the optical fiber (133). The tube (135) may be composed of, for example, polybutylene terephthalate (PBT), polypropylene, polyethylene, or polyvinyl chloride. In addition, a filler (137), such as jelly or waterproofing yarn, may be additionally filled inside the tube (135). For example, jelly may be filled, or a tensile material (not shown) such as aramid yarn may be filled. The tensile material has excellent tensile strength and is flexible, so that the cable can be stably installed.

In addition, as described below, the optical unit is equipped with a plurality of optical fibers and is connected to an MPO type optical connector so that a single optical unit can be branched and connected to a plurality of jumper cables.

The above optical unit (130) can be configured in a necessary form among various forms such as a tight buffer method or a loose tube method.

And, each of the power units (110) includes a conductor (113) and an insulator (115) surrounding the conductor (113). The power unit (110) may be formed in a form that complies with the standard used for general power, and the plurality of conductors (113) may take a form in which they are twisted together. In addition, the conductor (113) may be formed of a metal such as copper or aluminum, and the insulator (115) may be formed of a polymer resin such as polyethylene, polypropylene, or polyvinyl chloride.

Comparing the optical unit (130) and the power unit (110), the optical unit (130) has a smaller diameter than the power unit (110), and the optical fiber (133) provided in the optical unit (130) is relatively more vulnerable to bending or breaking, so the optical unit (130) can be placed in the center of the photoelectric composite cable (100), the outside of the optical unit can be wrapped with a protective layer (140), and the power unit (110) can be placed on the outer surface of the protective layer.

In addition, the cable core (105) may further include a filler (120) that fills the gap between the plurality of power units (110) or optical units (130).

Since the above power unit (110) has a circular shape, a gap or clearance occurs between adjacent power units (110). In this configuration, the overall outer shape of the photoelectric composite cable (100) cannot be maintained in a circular shape, so it becomes vulnerable to external bending or impact. Therefore, the gap in the cable core (105) can be filled with a filler (120), and the outer shape of the filler (120) can be maintained in a circular shape to have a structure that can withstand external impact.

The outer layer (150) provided on the outermost surface of the photoelectric composite cable (100) is a part that forms the outer shape of the photoelectric composite cable (100) and protects the optical unit (130) and power unit (110) included in the photoelectric composite cable (100).

The above outer layer (150) may include a non-woven tape (151) that is in contact with the cable core (105) and wraps around the outer periphery of the cable core (105), a metal protective layer (153) that surrounds the cable core (105) in a circular shape on the outside of the non-woven tape (151) and protects the cable core (105) from external impact, and an outer jacket (155) that surrounds the metal protective layer (153).

The above non-woven tape (151) is provided to wrap around the outer periphery of the cable core (105) from the outer side of the cable core (105), and may be provided to surround the power unit (110) and the optical unit (130) in a circular shape. The above non-woven tape (151) may be arranged in a form that wraps the optical unit and the power unit inside with compressed non-woven fabric. The above non-woven tape (151) may be formed by horizontally winding or vertically attaching a tape-shaped material.

The above metal protective layer (153) can be formed with wrinkles in which wrinkles and wrinkle valleys are repeatedly formed to surround the cable core (105).

For example, the metal protection layer (153) may be formed of a metal pipe such as aluminum in a corrugated shape in which wrinkles and grooves are repeatedly formed. Regarding a method for forming the metal protection layer (153), a plate-type metal plate is supplied together with a cable core (105) including an optical unit (130) and a power unit (110), the metal plate is rolled up and formed to wrap around the outside of the cable core, and then both ends of the metal plates that are in contact are joined by a method such as welding to produce a pipe shape having a predetermined diameter. Then, the pipe may be configured by pressing at predetermined intervals to form wrinkles on the outside.

Meanwhile, the outer jacket (155) may be composed of a flame-retardant and environmentally friendly resin. For example, the outer jacket (155) may be composed of polyethylene, polypropylene, or polyvinyl chloride (PVC).

The above-mentioned photoelectric composite cable (100) is connected to a jumper cable (50) that is connected to the RRU (40) after the power unit (110) and the optical unit (130) are branched off in the terminal box (1200) described above.

Hereinafter, the structure of the coaxial cable assembly (30) according to the present invention will be examined in detail.

FIG. 3 is a close-up perspective view of the connection state of a coaxial cable assembly (30) connecting an antenna (20) and an RRU (40) of an RRH system according to the present invention, and FIG. 4 illustrates a coaxial cable assembly (30) according to the present invention.

For convenience of explanation, the coaxial cable assembly (30) of FIG. 4 shows a state in which the sealing member (35) and the protective cap (37) are retracted near one connector of the coaxial cable assembly (30), and a state in which the sealing member (35) and the protective cap (37) are assembled near the other connector.

The RRH type base station system is installed on a base station tower, an antenna (20) is installed at the top of the tower, an RRU (40) is installed below it, and the antenna (20) and the RRU (40) can be connected with a coaxial cable assembly (30) according to the present invention.

As described above, when the coaxial cable constituting the coaxial cable assembly (30) is exposed to the outside, the outer jacket of the coaxial cable, etc., can be easily damaged by currents.

Accordingly, the coaxial cable assembly (30) according to the present invention may have a cable protection tube (39) for accommodating a coaxial cable therein.

The above cable protection tube (39) may be composed of a material that has a certain degree of flexibility, but is hard enough not to cause damage to a bird's beak, etc. The above cable protection tube (39) may have a corrugation structure with repeated grooves and ridges.

In addition, the base station antenna (20) and RRU (40) equipment are structures that are constantly exposed to the outdoors and are continuously exposed to snow and rain, so the coaxial cable assembly (30) according to the present invention is provided with a flexible sealing member (35) for sealing each connector connection part, etc., to prevent moisture from penetrating into the connection part of the antenna (20) and RRU (40) equipment, and may further be provided with a protective cap (37) for protecting and finishing the sealing member (35).

Accordingly, as shown in FIG. 3, the base station antenna (20) and the RRU (40) equipment have a structure in which a coaxial power supply line is formed through a coaxial cable and a connector provided on the end of the coaxial cable and the equipment, but the coaxial cable and connector connection are not exposed to the outside, so that damage to the coaxial cable or moisture infiltration can be prevented, making maintenance of the base station antenna (20) easy.

A coaxial cable assembly (30) according to the present invention may be configured to include: a coaxial cable; a coaxial connector (31) connected to both ends of the coaxial cable; a cable protection tube (39) that wraps around the outside of the coaxial cable so that an end area of a predetermined range of the coaxial cable is exposed to prevent damage to the coaxial cable; a flexible pipe-shaped sealing member (35) for sealing a connection portion of the coaxial connector (31) and a corresponding connector connected to the coaxial connector (31); and a protective cap (37) that receives and closes the sealing member (35) in the direction of the corresponding connector after mounting the sealing member.

A coaxial cable assembly (30) according to the present invention comprises a coaxial cable for transmitting and receiving RF signals between an antenna (20) and an RRU (40), and coaxial connectors (31) may be provided at both ends of the coaxial cable.

Since the connecting standards of the above antenna (20) and the above RRU (40) may be different, the coaxial connectors (31) provided at both ends of the coaxial cable of the present invention may be configured with any one of the standards of CHFS 1/4” standard, CHFS 3/8” standard, CHFS 1/2” standard, CHFA 3/8” standard, CHF 1/2” standard, and CLH 7/8” standard.

A cable protection tube (39) may be provided to protect the coaxial cable from damage by wrapping the outside of the coaxial cable so that a predetermined range of end areas of the coaxial cable is exposed on the outside of the coaxial cable, to which the coaxial connector (31) is connected at both ends. The cable protection tube (39) may have a corrugation structure to ensure flexibility and prevent bending, and is preferably made of a material that can prevent damage by currents.

As shown in Fig. 4, the cable protection tube (39) may be configured to a length that can expose both end areas of the coaxial cable. That is, the coaxial cable may have coaxial connectors (31) connected to both ends, and the cable protection tube (39) may be configured to be shorter than the coaxial cable in order to prevent moisture penetration between the cable protection tube (39) and the coaxial cable and to be finished with a heat shrink tube (33).

The above heat shrinkable tube (33) is a finishing material composed of a resin material whose inner diameter shrinks when heat is applied, and has the property of shrinking while wrapping around the outer surface of the finishing target.

As shown in Fig. 4, the heat shrinkable tube (33) is installed and shrunk in the boundary area of the cable protection tube (39) whose length is configured so that a predetermined end area of the coaxial cable and the coaxial cable are exposed, thereby closing the boundary area of the cable protection tube (39) and its interior, and preventing moisture from penetrating into the boundary area.

The above heat shrink tube (33) closes the boundary area between the cable protection tube (39) and the coaxial cable, but since the connection between the corresponding connector (21) provided in the antenna (20) or RRU (40) and the coaxial connector (31) provided at the end of the coaxial cable is performed at the base station tower site, the coaxial connector (31) itself is not the closing portion of the heat shrink tube (33).

Accordingly, after the connector connection by the worker is completed, a sealing member (35) may be additionally provided to seal the connector connection portion and the end of the heat shrink tube near the coaxial connector (31). The sealing member (35) may be configured in the form of a flexible pipe.

The above sealing member (35) is provided with an inlet (357) and an outlet (351) at both ends, and in order to provide a practical sealing effect, the inner diameters (see FIG. 9) of the inlet (357) and the outlet (351) may be configured to have a shape that is reduced to be smaller than the outer diameter of the coaxial cable to which the heat shrink tube (33) is mounted. Furthermore, the inner diameters of the inlet (357) and the outlet (351) may be configured to be different from each other. A detailed description of the sealing member (35) will be postponed.

A protective cap (37) may be provided on the outside of the sealing member (35). The protective cap (37) is configured to be structured so that the sealing member (35) made of a flexible material is entirely received and protected, and after the sealing member (35) is mounted on the connector connection portion, the sealing member (35) is inserted into the interior and fixed therein.

Accordingly, the sealing member (35) and the protective cap (37) can be fixed by pressing the sealing member (35) into the inside of the protective cap (37) without a separate fastening member.

When the above protective cap (37) is mounted, it can be configured to be pushed toward the housing of the antenna (20) or RRU (40) equipped with the corresponding connector (21) while containing the sealing member (35) so as to be tightly attached, or it can also be configured to be fastened using a separate fastening member.

The above sealing member (35) can prevent moisture penetration, etc., but since the sealing member (35) can also be composed of a flexible material, it can be easily damaged by a bird's beak, etc. Therefore, by finishing the exterior with the sealing member (35) contained in the protective cap (37), physical damage can be minimized.

Figures 5 to 8 illustrate a process of connecting a coaxial cable assembly (30) according to the present invention to an antenna (20).

When connecting an antenna (20) and an RRU (40), etc., through a coaxial cable assembly (30) according to the present invention, as shown in FIGS. 5 and 6, the protective cap (37) and sealing member (35) of the coaxial cable assembly (30) are first retracted to the rear of the coaxial connector (31), and then the coaxial connector (31) provided at the end of the coaxial cable is connected to the corresponding connector (21) of the antenna (20), etc., to complete the electrical connection.

And, as shown in Fig. 7, the sealing member (35) can be moved to the connector connection portion so that the connector connection portion and the end of the heat shrink tube (33) in the direction of the coaxial connector (31) can be sealed together.

And as shown in Fig. 8, the protective cap (37) can be pushed toward the connector connection portion to complete the connection between the coaxial cable assembly (30) and the antenna (20).

Since the above sealing member (35) is made of a flexible material, when the above protective cap (37) is pushed in, the sealing member (35) is pressed into the inside of the protective cap (37), so that the protective cap (37) can be fixed by the sealing member (35). It is also possible to use a separate fastening member to fix the protective cap (37) to the antenna (20) or the housing of the RRU (40).

FIGS. 9 and 10 illustrate side and cross-sectional views of a sealing member (35) constituting a coaxial cable assembly (30) according to the present invention.

As shown in FIGS. 9 and 10, the sealing member (35) is provided with an inlet (357) and an outlet (351) at both ends, and the inner diameters (d1, d2) of the inlet (357) and the outlet (351) are configured to have a shape that is reduced to be smaller than the outer diameter of the coaxial cable to which the heat shrink tube (33) is mounted, so that the sealing member can perform the function of sealing the outer surface of the coaxial cable or connector passing through the inlet (357) and the outlet (351).

The above sealing member (35) is mainly intended to seal the connection portion of the coaxial connector (31) and the corresponding connector (21) connected to both ends of the coaxial cable, and considering that the outer diameter of the connector or the connection portion of the connector is configured to be larger than the outer diameter of the coaxial cable, an expansion portion (353) with an enlarged inner diameter may be provided between the inlet (357) and the outlet (351) of the sealing member (35) to accommodate the connection portion of the coaxial connector (31) and the corresponding connector (21).

In general, since the coaxial connector (31) and the corresponding connector (21) provide a screw-fastening method of fastening, the diameter of the connector connection portion is larger than the cable diameter due to the fastening screw, etc. Therefore, the sealing member (35) may also be provided with an expansion portion (353) in consideration of the increase in the diameter of the connector connection portion, so that the connector connection portion can be stably accommodated. The inner diameter (d2) of the expansion portion (353) of the sealing member (35) may be configured to be the largest among the sealing members.

And, as can be seen in FIGS. 9 and 10, the expansion portion (353) of the sealing member (35) may be provided closer to the outlet (351) of the sealing member (35) in the direction of the coaxial connector (31) among the inlet (357) and the outlet (351) of the sealing member (35).

With the sealing member (35) mounted, the expansion member (353) is a space where a connector connection portion is accommodated, and the corresponding connector (21) of the antenna (20) or RRU (40) is provided in a manner directly connected to the antenna (20) or RRU (40) housing, so that the expansion member (353) of the sealing member (35) can be provided closer to the outlet (351) of the sealing member (35) in response to the connector connection portion position.

And, with the sealing member (35) mounted, the outlet (351) of the sealing member (35) seals the body of the corresponding connector (21) and the inlet (357) of the sealing member (35) seals the outer surface of the coaxial cable to which the heat shrink tube (33) is mounted, so it is preferable that the inner diameter (d1) of the outlet (351) of the sealing member (35) be configured to be larger than the inner diameter (d3) of the inlet (357).

In addition, the sealing member is provided with an inlet and an outlet at both ends, and the inner diameter of the inlet and outlet is configured to be smaller than the outer diameter of the coaxial cable to which the heat shrink tube is mounted, so that when the sealing member is mounted, the inlet and outlet of the sealing member are each configured in a sealed state.

Accordingly, since there may be an empty space inside the sealing member when the sealing member is mounted on the connector connection portion, interference may occur due to the volume of the sealing member when the cap member is mounted. To resolve this, when the outer surface of the sealing member (35) is pressed so that the empty space inside the sealing member (35) is removed and contracted while the sealing member is mounted, the contracted state of the sealing member can be maintained, and when the cap member is mounted in the contracted state of the sealing member, the workability of the cap member mounting work can be improved.

And, as shown in FIGS. 9 and 10, a plurality of protruding ribs (335r) are provided in the circumferential direction in an area other than the expansion portion (353) of the sealing member (35) to prevent slipping, etc. when mounting the sealing member (35).

Figure 11 illustrates a cross-sectional view of the mounting state of the sealing member (35) and the cap member constituting the coaxial cable assembly according to the present invention.

In addition to the function of preventing slipping when a sealing member (35) is mounted on a connector connection portion, the above-mentioned protruding rib (335r) can also provide a function of fixing or supporting a protective cap to prevent the protective cap from slipping off, etc. when the protective cap is mounted after the sealing member (35) is mounted on the connector connection portion.

That is, as illustrated in FIG. 11, at least one engaging groove (37g) may be provided on the inner surface of the protective cap to engage and fix at least one protruding rib (335r) provided on the sealing member (35), and when the protective cap is mounted on the outer side of the sealing member (35), the protruding rib (335r) of the sealing member (35) is secured to the engaging groove (37g) to prevent the protective cap from slipping down, etc.

As described above, the protective cap can be configured in a way that a flexible sealing member (35) is pressed into the inside and fixed, but an additional mechanical catch structure can be added to prevent the cap member from flowing down, etc., thereby stabilizing the mounting state of the cap member.

And, as illustrated in FIG. 11, the sealing member (35) is provided with a plurality of ring-shaped protruding ribs (335r), and when the protective cap is mounted while surrounding the sealing member (35), it is preferable that the protruding rib (335r) closer to the inlet (357) of the sealing member (35) among the plurality of protruding ribs (335r) is configured to be seated in the engaging groove (37g), so that the engaging state of the protruding rib (335r) and the engaging groove (37g) is maintained while the cap member is in close contact with the connector.

Although this specification has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to modify and change the present invention in various ways without departing from the spirit and scope of the present invention as set forth in the claims below. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, it should be considered that it is included in the technical scope of the present invention.

20 : Antenna
30 : Coaxial Cable Assembly
40 : RRU
100 : Photoelectric composite cable
1200 : Terminal Box

Claims (12)

coax;
A coaxial connector connected to both ends of the above coaxial cable;
A cable protection tube that wraps the outside of the coaxial cable to expose a predetermined range of end areas of the coaxial cable to prevent damage to the coaxial cable;
A flexible pipe-shaped sealing member for sealing the connecting portion of the above coaxial connector and the corresponding connector connected to the above coaxial connector; and
After mounting the sealing member, a protective cap is provided for receiving and finishing the sealing member in the direction of the corresponding connector;
The above sealing member has a plurality of protruding ribs for anti-slip, and the protective cap has at least one catching groove on the inner surface for catching and fixing at least one protruding rib provided on the sealing member, so that the sealing member is fixed inside the protective cap.
Includes a heat shrink tube that wraps and closes the connection part of the coaxial connector connected to both ends of the coaxial cable from the area of both ends of the cable protection tube,
The above sealing member is provided with an inlet and an outlet at both ends, and the inner diameter of the inlet and outlet is smaller than the outer diameter of the coaxial cable equipped with the heat shrink tube.
An expansion pipe with an enlarged inner diameter is provided between the inlet and outlet of the sealing member to accommodate the connection portion of the coaxial connector and the corresponding connector.
A coaxial cable assembly characterized in that the inner diameter of the outlet of the sealing member is larger than the inner diameter of the inlet. delete delete delete In the first paragraph,
A coaxial cable assembly, characterized in that the expansion member of the sealing member is provided closer to the outlet in the direction of the coaxial connector among the inlet and the outlet. delete In the first paragraph,
A coaxial cable assembly characterized in that the above protruding rib is provided in a circumferential direction in an area other than the expansion portion of the sealing member. delete In the first paragraph,
A coaxial cable assembly characterized in that a plurality of protruding ribs provided on the sealing member are ring-shaped, and when the protective cap is mounted to surround the sealing member, a protruding rib closer to the inlet side among the plurality of protruding ribs is seated in the engaging groove. In the first paragraph,
A coaxial cable assembly characterized in that when the outer surface of the sealing member is pressed so that the empty space inside the sealing member is removed and the sealing member shrinks while the sealing member is installed, the shrinkage state of the sealing member is maintained. In the first paragraph,
The above coaxial cable assembly is a coaxial cable assembly characterized in that it connects an RRU and an antenna in a RRH type base station system. In the RRH type base station system,
A terminal box to which at least one photovoltaic composite cable including a plurality of power units and a plurality of optical units for supplying power and data from a ground PSU and BBU is connected and branched;
An RRU connected to the terminal box with a jumper cable including at least one power unit and at least one optical unit;
An antenna for transmitting and receiving RF signals with the RRU; and
A base station system of the RRH type, comprising a coaxial cable assembly according to any one of claims 1, 5, 7, and 9 to 11 for connecting the RRU and the antenna.

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