Patent Publication Number: US-11380987-B2

Title: Antenna-integrated base station apparatus and antenna fixing equipment of mobile communication network

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Divisional Application of U.S. application Ser. No. 16/039,344, filed on Jul. 19, 2018 (now pending), which is a Continuation of International Application No. PCT/KR2017/000644, filed on Jan. 19, 2017, which claims the benefit of and priority to Korean Patent Application No. 10-2016-0008310, filed on Jan. 22, 2016, the content of which are herein incorporated by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure in some embodiments relates to a base station apparatus or a repeater apparatus (hereinafter collectively referred to as “base station apparatus”) in a mobile communication such as a CDMA, GSM, third generation (3G), LTE or such network. More particularly, the present disclosure relates to an antenna-integrated base station apparatus and an antenna fixing apparatus. 
     BACKGROUND 
     A base station of a mobile communication system has been generally divided into a base station apparatus including various electric and electronic devices for processing transmit and receive signals, and an antenna apparatus for transmitting and receiving radio signals with at least one radiating element. The antenna apparatus is installed at a high position such as a building roof, a tower or a support column, and the base station apparatus is usually installed at a low position on the ground. The antenna and base station apparatuses may be connected in an arrangement to transmit and receive wireless signals and/or control signals to and from each other. 
     Recent downsizing and weight reduction achievements of the respective apparatuses for wireless signal processing have eased their tower installations, encouraging the provision of base station apparatuses with antenna built-in. At this time, the relevant antenna-integrated base station apparatus can be installed in its entirety on an outside support column of a building or the like. These antenna-integrated base station apparatuses can maximize utilization of space as a whole, and minimize losses due to the feeder cable for interconnecting between the base station apparatus and the antenna as commonly practiced in the art. 
     Meanwhile, an antenna (or an antenna-integrated base station apparatus) is typically installed on a support column or the like by an installation structure which can reposition and fix the antenna so as to have its posture tilted with an appropriate inclination for properly directing the antenna to the ground (that is, towards a service user on the ground). Such a structure is implemented by a bracket structure and/or a clamp structure for fixedly fastening the antenna to the support column. For example, a support bracket fixed to the support column is formed with a vertically arcuate guide hole (i.e., a slot formation), while an antenna bracket or the like is fastened by a bolt coupling structure for positional fixation, which is fixedly disposed in the relevant guide hole in a proper position. A prior art example of such antenna installation method is Korean Unexamined Publication No. 1020030069260 filed by LG Electronics Inc., titled Antenna System for A Mobile Communication Station, invented by KIM, Dae Su and AHN, Hong Jin, and published on Aug. 27, 2003. 
     In this manner, the installation structure of the antenna allows an operator to not only adjust the posture of the antenna as appropriate at the time of the initial installation, but also reposition it thereafter and when the radio wave environment changes. 
     DISCLOSURE 
     Technical Problem 
     However, installing the antenna by such method as disclosed in the aforementioned Korean Unexamined Publication No. 1020030069260 requires an operator first to adjust and hold the antenna posture at a desired inclination angle until the fixing bolt is fastened, troubling the operator of using the human power to hold the posture of the antenna throughout the bolt fastening procedure. In addition, during the operation of fastening the fixing bolt by the operator, the antenna tilt often deviates from the desired angle due to the rotational friction of the bolt, compelling the operator to perform the same operation again and again. 
     In addition, when installing the antenna-integrated base station apparatus, the size and weight of the fixing component for installing the base station apparatus proportionally add to the apparatus&#39; own size and weight, worsening the difficulty of the installation work. 
     Further, it is typical that the antenna (and the antenna-integrated base station apparatus) be installed at a high position such as on a roof or an exterior wall of a building, a street lamp, in a spire, etc., which requires an operator to use a crane or a rope for work-at-height to perform, further elevating the difficulty level of the same work done on the ground. Particularly, the operator utilizing work tools may cause casualties and damage to property from being struck with inadvertently dropped tools. 
     On the other hand, an antenna-integrated base station apparatus may be equipped with a global positioning system (GPS) device. In principle, to optimize the performance of the built-in GPS antenna, the GPS device is installed externally of the base station apparatus so as to have an upright posture facing towards the sky. 
     When tilting and installing an antenna-integrated base station apparatus equipped with such a GPS device, the installation angle of the GPS device tends to deviate from the optimum position. Accordingly, there is a need for an arrangement for installing an antenna-integrated base station apparatus, taking account of the installation angle of GPS equipment. 
     In consideration of the above issues, the present disclosure in at least some embodiments aims to provide an antenna-integrated base station apparatus and an antenna fixing apparatus, which enhance the installability and work time reduction. 
     Further, the present disclosure in at least some embodiments aims to provide an antenna-integrated base station apparatus and an antenna fixing apparatus with self-adjustment to their own optimum installation angles, while allowing a GPS device to be installed in its optimally angled position. 
     Summary 
     According to some aspects of the present disclosure, a base station apparatus of an antenna-integrated type for use in a mobile communication network, includes an enclosure, an antenna, an enclosure fixing device, an enclosure and an antenna fixing apparatus. The enclosure is configured to have electric and electronic devices for processing signals in receipt and to form at least a part of an exterior of the base station. The antenna is configured to be installed so as to be tiltable on one surface of the enclosure, to have an outer contour defined by a radome, to include at least one radiating element for transmitting and receiving a radio signal. The enclosure fixing device is configured to fixedly mount the enclosure to an external support. The antenna fixing apparatus is configured to fixedly install the antenna on the enclosure so that the antenna is adjustably tilted with respect to the enclosure. 
     The antenna fixing apparatus may include a dial knob configured to be installed externally of the radome, a gear structure configured to make a helical or rotational movement in response to a rotation of the dial knob, a linear movement mechanism configured to linearly move in engagement with the gear structure, and a linkage mechanism configured to secure the linear movement mechanism to the enclosure. 
     The antenna fixing apparatus may include a dial knob configured to be installed externally of the radome, a rotating rod configured to turn in response to a rotation of the dial knob, and to be formed with a gear arrangement, a movable block configured to have a gear structure that meshes with the gear arrangement of the rotating rod, and to linearly move in a sliding manner when the rotating rod turns, and a linkage mechanism configured to establish a linkage between the movable block and at least one hinge member that is fixedly mounted to one side of the enclosure. 
     The dial knob may be installed at an upper middle portion of the radome. The rotating rod may be formed with a screw gear arrangement. The movable block may have a gear structure in the form of a nut that meshes with the screw gear arrangement. 
     The dial knob may be installed on a lateral side of the radome. The rotating rod may be formed with a rotating gear structure. The movable block may have a linear gear structure in mesh with the rotating gear structure. 
     The linkage mechanism may include a link configured to interlink between at least one upper hinge member that is fixed to an upper portion of the enclosure and the movable block. Pivotable joints may be formed by link pins between the link and the upper hinge member of the enclosure, and between the link and the movable block, respectively. The enclosure may be formed, at a front lower portion, with at least one lower hinge member. The radome may be correspondingly formed with a hinge member for hinged connection with the at least one lower hinge member. 
     According to some other aspects of the present disclosure, an antenna fixing apparatus of base station in a mobile communication network, includes a dial knob, a rotating rod, a movable block and a linkage mechanism. The dial knob is configured to be installed externally of a radome of an antenna. The rotating rod is configured to turn in response to a rotation of the dial knob, and to be formed with a gear arrangement. The movable block is configured to have a gear structure that meshes with the gear arrangement of the rotating rod, and to linearly move in a sliding manner when the rotating rod turns. The linkage mechanism is configured to establish a linkage between the movable block and at least one hinge member formed on a bracket for installing the antenna on an external support. 
     The at least one hinge member of the bracket may include an upper hinge member formed on a first upper bracket that is subordinate to the bracket, and a lower hinge member formed on a second lower bracket that is subordinate to the bracket. The linkage mechanism may include a link that interconnects between the upper hinge member of the bracket and the movable block. Pivotable joints may be formed by link pins between the link and the upper hinge member of the bracket, and between the link and the movable block, respectively. The radome may be correspondingly formed with a hinge member for hinged connection with the at least one lower hinge member of the second lower bracket. 
     Advantageous Effects 
     As described above, the antenna-integrated base station apparatus of the mobile communication network, and the antenna fixing apparatus therefor according to some embodiments of the present disclosure are structured to maintain the state in which the base station apparatus stands upright in the vertical direction, and to render the antenna to be exclusively angularly adjustable, and thereby enhance the installability and work time reduction. Moreover, this obviates the need for the installer to use a separate tool for adjusting the installation angle, improves the convenience of the angle adjustment operation while shortening the operation time, and provides more accurate angular adjustments. 
     Further, the ability to install the base station apparatus in an upright posture allows a GPS device to be installed in its optimally angled position, and at the same time, permits an independent adjustment of the installation angle of the antenna into the optimum installation angle. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Some embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. 
         FIGS. 1A to 1F  are external structural views of an antenna-integrated base station apparatus of a mobile communication network, according to a first embodiment of the present disclosure. 
         FIGS. 2A and 2B  are perspective views of the installed state of the antenna-integrated base station apparatus shown in  FIGS. 1A to 1F . 
         FIG. 3A  is a cross-sectional view along line A-A′ shown in  FIG. 1B , and  FIG. 3B  is an enlarged view of portion B of  FIG. 3A . 
         FIG. 4  is a perspective view of the antenna alone shown in  FIG. 3A . 
         FIG. 5  is a perspective view showing just the enclosure of the base station apparatus of  FIGS. 1A to 1F , and the antenna fixing apparatus capable of adjusting the installation angle. 
         FIG. 6  is an enlarged perspective view of the antenna fixing apparatus of  FIG. 5 . 
         FIG. 7  is an external perspective view of an antenna-integrated base station apparatus of a mobile communication network, according to a second embodiment of the present disclosure. 
         FIG. 8  is an enlarged perspective view of the antenna fixing apparatus of  FIG. 7 . 
         FIG. 9  is a perspective view of an antenna fixing apparatus of a base station in a mobile communication network, according to a third embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, specific expressions are presented with particular details such as specific structural elements, but they are provided to aid in a more general understanding of the present disclosure, and it will be obvious to one of ordinary skill in the art that these specific matters can be subject to certain modifications or changes within the range of the present disclosure. 
       FIGS. 1A to 1F  are external structural views of an antenna-integrated base station apparatus of a mobile communication network, according to a first embodiment of the present disclosure, wherein  FIG. 1A  is a perspective view of one side thereof,  FIG. 1B  a front view, and  FIG. 1C  a side view,  FIG. 1D  a rear view,  FIG. 1E  a top view, and  FIG. 1F  a bottom view. 
     Referring to  FIGS. 1A to 1F , the antenna-integrated base station apparatus according to the first embodiment of the present disclosure includes an enclosure  10  and an antenna  20 . The enclosure  10  houses various electrical and electronic devices for processing signals in receipt, and it forms at least a part of the exterior of the relevant base station apparatus. The antenna  20  is tiltably fixed on one surface (i.e., the front surface) of the enclosure  10 , and it is equipped with at least one radiating element housed therein for transmitting and receiving radio signals. 
     On its front and rear exterior surfaces, the enclosure  10  may formed integrally with a plurality of radiation fins  101  for heat emission. Further, on the rear surface of the enclosure  10 , an enclosure fixing device  12  such as a bracket is installed to fixedly mount the enclosure  10  on a support (not shown) such as an external support column. The enclosure fixing device  12  may have a simple structure in which the enclosure  10  is installed, for example, in an upright posture so as to be fixed without inclination. On the upper surface of the enclosure  10 , a GPS device  14  may be mounted so that it is fixedly installed upright on top without inclination. 
     The antenna  20  may be provided therein with at least one radiating element (not shown), and it may have its outer contour defined by a radome  202  forming the outer contour of the antenna  20 . The radiating element provided in the radome  20  may be, for example, a patch type radiating element implemented in a PCB structure for miniaturization thereof, although a dipole type or other various types of radiating elements may be also provided. A dipole type radiating element would have the installation space extended thicknesswise corresponding to the height of the radiating element, which needs to be reflected in determining the thickness of the radome  202  at the corresponding portion for accommodating the radiating element. 
     Meanwhile, the enclosure  10  (thus the electronic devices inside) and the antenna  20  (with the radiating elements inside) may be interconnected by an appropriate connector (e.g., at  244  in  FIG. 4 ) and a cable (e.g., at  242  in  FIG. 4 ). 
     Further, on the rear face of the radome  202  of the antenna  20 , an antenna fixing apparatus  22  is provided for installing the radome  202  so as to be fixed while being tiltable from the front face of the enclosure  10 . The antenna fixing apparatus  22  has a dial knob  220  which receives a rotation operation of an installer, and a mechanism (not shown) for changing the angle of the tilt of the radome  202  (as a result, the tilt of the antenna) by pivoting the radome  202  in response to a rotation of the dial knob  220  about an axis while otherwise holding the radome  202  in place. Such mechanism may be implemented by such structures as a gear structure that makes helical or rotational movement in response to the rotation of the dial knob  220 , a linear movement mechanism that linearly moves in engagement with the gear structure, and a linkage mechanism for securing the linear movement mechanism to the enclosure  10 . 
       FIGS. 2A and 2B  are perspective views of the installed state of the antenna-integrated base station apparatus shown in  FIGS. 1A to 1F .  FIG. 2A  shows the initially installed state of the apparatus, and  FIG. 2B  shows the state of installation after an installer operated the antenna fixing apparatus  22 . As shown in  FIG. 2A , the enclosure  10  of the base station apparatus may be fixedly installed on a support column  1  by the enclosure fixing device  12 . At this time, when the installer rotates the dial knob  220  of the antenna fixing apparatus  22  as shown by the rotational arrow in  FIG. 2B , the antenna  20  is inclined by an angle (θ) corresponding to the rotational operation of the dial knob  220 , while the enclosure  10  remains fixed. 
     As structured in the above description, according to the present disclosure, the base station apparatus and the GPS device  14  installed in the base station apparatus can remain standing upright, while the antenna  20  alone can be separately adjusted angularly. Further, the installer needs no special tool or support for the base station apparatus for making adjustments to the installation angle of the antenna  20 , which is performed by operating the dial knob  220  of the antenna fixing apparatus  22 . 
     At this time, the maximum rotatable angle of the antenna  20  by the antenna fixing apparatus  22  can be realized at, for example, about 5 to 15 degrees. 
       FIG. 3A  is a cross-sectional view along line A-A′ shown in  FIG. 1B , and  FIG. 3B  is an enlarged view of portion B of  FIG. 3A .  FIG. 4  is a perspective view of the antenna alone shown in  FIG. 3A . For convenience in describing the embodiments,  FIGS. 3A to 4  omit various devices which can be installed inside the enclosure, and radiating elements and the like provided inside the antenna.  FIG. 5  is a perspective view showing just the enclosure of the base station apparatus of  FIGS. 1A to 1F , and the antenna fixing apparatus capable of adjusting the installation angle.  FIG. 6  is an enlarged perspective view of the antenna fixing apparatus of  FIG. 5 . On the other hand, the enclosure  10  as in  FIG. 5  shows a state in which the GPS device  14  has been removed (not yet attached), yet illustrating a connector  140  which is installed on the upper side of the enclosure  10  for mounting the GPS device  14 . Hereinafter, with reference to  FIGS. 3A to 6 , the structure of the antenna fixing apparatus  22  will be described in more detail. 
     The antenna fixing apparatus  22  may include the dial knob  220  installed for operation by an installer at an appropriate position outside the radome  202 , for example, in the middle of the upper surface of the radome  202 , and a rotating rod  222  that is rotated in response to the rotation of the dial knob  220  and is formed with, for example, a screw gear arrangement. The dial knob  220  and the rotating rod  222  may be supportedly mounted to be rotatable by mountings  203 - 1  and  203 - 2  each formed in a proper shape on the rear side of the radome  202 . Here, the dial knob  220  and/or the mounting  203 - 1  where the dial knob  220  is installed may be both formed or printed with appropriate scale marks or other various forms of signs for the installer to recognize the rotation amount of the dial knob  220  more easily. 
     Further, the antenna fixing apparatus  22  includes a movable block  223 , having a gear structure in the form of a nut that meshes with the screw gear arrangement of the rotating rod  222 , to linearly move in a sliding manner when the rotating rod  222  turns. The antenna fixing apparatus  22  also includes a linkage mechanism that establishes a linkage between the movable block  223  and, for example, a couple of upper hinge members  102 - 1 ,  102 - 2  fixedly mounted to proper upper portions in the front of the enclosure  10 . The screw gear arrangement of the rotating rod  222  is formed with a male thread having a constant pitch, while the movable block  223  has a female thread with a pitch value corresponding to that of the screw gear arrangement. The pitch value of the screw gear arrangement of the rotating rod  222  and the corresponding pitch value of the female thread of the movable block  223 , are appropriately set so as to have coarser threads than the ordinary gear structure, in order to minimize the influence of foreign matter such as dust while allowing a smooth movement of the movable block  223  by the rotation of the screw gear. 
     The linkage mechanism is mainly composed of a link  224  of an appropriate shape for interlinking between the upper hinge members  102 - 1 ,  102 - 2  of the enclosure  10  and the movable block  223 . Pivotable joints are formed by link pins  230 - 1 ,  230 - 2 ,  225  between the link  224  and the upper hinge members  102 - 1 ,  102 - 2  of the enclosure  10 , and between the link  224  and the movable block  223 , respectively. 
     Meanwhile, the enclosure  10  is formed, at its appropriate front lower portions, with lower hinge members (reference numerals  103 - 1  and  103 - 2  in  FIG. 5 ), while the radome  202  is formed with hinge members (reference numeral  211 - 1  in  FIG. 4 ) for hinged connection with the lower hinge members  103 - 1 ,  103 - 2  at their corresponding positions. The lower hinge members  103 - 1 ,  103 - 2  of the enclosure  10  and the hinge members  211 - 1  of the radome  202  are pivotally interconnected by link pins  231 - 1 ,  231 - 2 . 
     As to the principle of the angular adjustment of the antenna  20  by the antenna fixing apparatus  22  having the above-described configuration, the dial knob  220  is operated to turn the rotating rod  222 , whereby the movable block  223  moves up and down. With the movable block  223  being connected by the link  224  to the upper side of the enclosure  10 , and the lower side of the enclosure  10  being in hinged connection with the lower side of the antenna  20 , the upward and downward movements of the movable block  223  cause the antenna  20  to pivot as a whole about the hinge connection between the enclosure  10  and the antenna  20 . In other words, the distance between the upper side of the antenna  20  and the enclosure  10  is increased or decreased. 
       FIG. 7  is an external perspective view of an antenna-integrated base station apparatus of a mobile communication network, according to a second embodiment of the present disclosure.  FIG. 8  is an enlarged perspective view of the antenna fixing apparatus of  FIG. 7 . In  FIGS. 7 and 8 , the antenna  20  is shown as being transparent for convenience of explanation, and  FIG. 7  shows only a substantial part of the antenna fixing apparatus. As shown in  FIGS. 7 and 8 , the antenna-integrated base station apparatus according to the second embodiment of the present disclosure may include an enclosure  10  and an antenna  20  having almost the same structures as those of the first embodiment disclosed in the previous drawings. The basic difference from the first embodiment is, as shown in  FIGS. 7 and 8 , that an antenna fixing apparatus  25  for fixing the antenna  20  to the enclosure  10  is structured to have a dial knob  250  attached to a lateral side of the radome  202 . 
     More specifically, the antenna fixing apparatus  25  according to the second embodiment of the present disclosure includes a dial knob  250  installed on the upper portion of one outer side of the radome  202 , a rotating rod  251 , and a movable block  253 . The rotating rod  251  is rotated by the rotation of the knob  250  and is formed with, for example, with a rotating gear structure  252 . The movable block  253 , which has a linear gear structure in mesh with the rotating gear structure  252  of the rotating rod  251 , moves linearly in a sliding manner when the rotating rod  251  turns. In other words, the gear coupling between the rotating gear structure  252  of the rotating rod  251  and the movable block  253  corresponds to the rack and pinion gear structure. As in the first embodiment, the movable block  253  is connected to the enclosure  10  via a linkage mechanism including a link  254 . 
     The principle of angular adjustment of the antenna  20  by the antenna fixing apparatus  25  according to the second embodiment of the present disclosure is the same as in the first embodiment, which is to operate the dial knob  250  for turning the rotating rod  251  and accordingly move the movable block  253  up and down. 
     The configuration and operation of the antenna-integrated base station apparatus according to embodiments of the present disclosure can be implemented as described above, but on the other hand, besides the above description of the present disclosure presented with specific examples, variations thereof can be made without departing from the scope of the present disclosure. For example, in the above-described embodiments, the dial knob of the antenna fixing apparatus is installed on the upper side or the lateral side of the radome, although a structure is also envisioned that the dial knob is installed on the lower side of the radome. 
     Further, in the above description, it is mentioned that the maximum rotation angle of the antenna  20  by the antenna fixing apparatus  22  is about 5 to 15 degrees, although the rotation angle of the antenna can be implemented in a wide range beyond 15 degrees. Although the above description is directed to the structure in which the antenna is tilted towards the ground, the present disclosure in yet another embodiment envisions the antenna tilting towards the sky. 
     In the above description, the antenna fixing apparatus according to the embodiments of the present disclosure is applied to the antenna-integrated base station apparatus. However, in yet another embodiment of the present disclosure, the antenna fixing apparatus can be also installed on an antenna that is mounted separately from the base station apparatus. For example, independent of base station apparatuses for ground level installation, antennas to be mounted on the support stands such as support columns may be installed with mounting brackets which can be appropriately structured to incorporate the antenna fixing apparatus. Specifically, the bracket may be structured in part to be coupled with the support column, while it is structured in part (e.g., as a first upper side sub-bracket that is subordinate to the bracket) similar to the upper hinge members  102 - 1 ,  102 - 2  as shown in  FIG. 5  to be connected with the linkage structure of the antenna fixing apparatus. In addition, the bracket may be structured in part to be coupled with the support column, while it is structured in part (e.g., as a second lower side sub-bracket) similar to the lower hinge members  103 - 1 ,  103 - 2  as shown in  FIG. 5  to be in hinged connection with the hinge members of the radome of the antenna. Through the bracket having such a structure and the antenna fixing apparatus, the antenna can be installed on the support column separately from the base station apparatus. The remainder of the configuration of the antenna fixing apparatus may be similar to the structure of the first or second embodiment. 
       FIG. 9  is a perspective view of an antenna fixing apparatus of a base station in a mobile communication network, according to a third embodiment of the present disclosure, illustrating an example antenna fixing apparatus that can be installed in an antenna  21  to be mounted on a support column  1  separately from a base station apparatus for ground level installation.  FIG. 9  depicts the antenna  21  by dotted lines for convenience of explanation, with the antenna  21  detached from a bracket  16 / 18  on the support column  1 . 
     Referring to  FIG. 9 , the antenna fixing apparatus according to the third embodiment of the present disclosure includes a dial knob  270 , a rotating rod  272 , a movable block  273  and a linkage mechanism  274 . The dial knob  270  is installed externally of a radome  212  of the antenna  2 . The rotating rod  272  turns in response to the rotation of the dial knob  270  and is formed with, for example, a gear arrangement. The movable block  273  has a gear structure that meshes with the gear arrangement of the rotating rod  272 , and linearly moves in a sliding manner when the rotating rod  272  turns. The linkage mechanism  274  establishes a linkage between the movable block  273  and at least one hinge member formed on a bracket (e.g., a first sub-bracket  16 ) for installing the antenna  21  on a support such as the external support column  1 . 
     The bracket for mounting the antenna  21  on the support column  1  may be implemented as two separate brackets including a first sub-bracket  16  located on the upper side, and a second sub-bracket  18  located on the lower side. The first sub-bracket  16  has upper hinge members  142 - 1  and  142 - 2 , while the second sub-bracket  18  has lower hinge members  152 - 1  and  152 - 2 . The upper hinge members  142 - 1 ,  142 - 2  of the first sub-bracket  16  are structured to be hinged to the linkage mechanism  272 . In addition, the lower hinge members  152 - 1 ,  152 - 2  of the second sub-bracket  18  are hinged to hinge members  213 - 1 ,  213 - 2  formed on the radome  212  of the antenna  21 . 
     Through the antenna fixing apparatus having the structure according to the third embodiment of the present disclosure shown in  FIG. 9 , the installer operates only the dial knob  270  of the antenna fixing apparatus, and thereby adjusts the installation angle of the antenna  21 . 
     On the other hand, similar to the structure of the first embodiment of the present disclosure shown in  FIGS. 2A to 6 , the antenna fixing apparatus of the third embodiment of the present disclosure shown in  FIG. 9  is installed on the upper surface of the antenna  21 . In yet another embodiment of the present disclosure, the antenna fixing apparatus may be also structured to be installed on a lateral side of the antenna radome similar to the structure of the second embodiment shown in  FIGS. 7 and 8 . Such a structure may have the dial knob installed on the lateral side of the radome  212 , the rotating rod provided with a rotating gear structure, and the movable block fitted with a linear gear structure that meshes with the rotating gear structure. 
     As described above, there are various modifications and changes available to the present disclosure, and therefore, the scope of the present disclosure is not defined by the embodiments described, but by the claims and the equivalence of the claims.