Patent Publication Number: US-2018041293-A1

Title: Apparatus for automatically measuring pim

Description:
TECHNICAL FIELD 
     The present invention relates to a passive intermodulation (PIM) automatic measurement device, and more particularly, to a PIM automatic measurement device in which one or more first connectors and one or more second connectors are automatically connected to ports of a radio frequency (RF) component, thus enabling PIM measurement. 
     BACKGROUND ART 
     Passive intermodulation (PIM) is a phenomenon in which, when signals at two or more frequencies are input to a passive device, signals of other unintended frequencies are generated in addition to the two or more signals, and PIM commonly occurs in RF components such as an antenna using multiple frequency bands. Due to this, the quality of wireless communication deteriorates, and, in severe cases, wireless communication may fail, and thus it is necessary to previously measure PIM to produce antennas, and problems occurring therefrom have to be addressed. 
     In conventional PIM measurement devices, a PIM measurement device or a zig is individually designed and produced according to the type of port included in an RF component such as an antenna, and antenna manufacturers should individually purchase and use an expensive PIM measurement device or zig according to the type of antenna port, and thus unnecessary time and cost are consumed. 
     In addition, when connecting a PIM measurement device to an RF component, a user must individually connect a connector of the PIM measurement device and a port of the RF component, and also individually change the phase of a signal emitted from the RF component by operating a motor, and thus unnecessary time and effort are required. 
     Therefore, the present invention provides a novel PIM automatic measurement device that may be generally used in all RF components regardless of the type of ports of the RF components, does not require a user to put effort into connecting a connector of the PIM measurement device and a port of an RF component through automatic connection therebetween, and may conveniently change the phase of a signal emitted from the RF component without being individually changed by a user by operating a motor. 
     DISCLOSURE 
     Technical Problem 
     Therefore, the present invention has been made in view of the above problems, and it is one object of the present invention to provide a PIM automatic measurement device that may be generally used in all RF components regardless of the type of ports of RF components for PIM measurement. 
     It is another object of the present invention to provide a PIM automatic measurement device that does not require a user to put effort into connecting a connector of the PIM measurement device to a port of an RF component, through automatic connection therebetween. 
     It is yet another object of the present invention to provide a PIM automatic measurement device that enables a user to conveniently change the phase of a signal emitted from an RF component instead of changing the phase of the signal by individually operating a motor. 
     Meanwhile, the present invention is not limited to the technical goals set forth above and other technical goals may be inferred from the following description within a range obvious to those of ordinary skill in the art. 
     Technical Solution 
     A PIM automatic measurement device according to an embodiment of the present invention includes: one or more first connectors disposed on an upper surface of a first plate; one or more first movement controllers disposed on the upper surface of the first plate to control movement of the one or more first connectors; a second plate disposed on a lower surface of the first plate; one or more second connectors disposed on the lower surface of the second plate; and one or more second movement controllers disposed on a rear surface of the second plate to control movement of the one or more second connectors. According to the present invention, PIM of all RF components may be measured regardless of the type of ports of the RF components, and thus time and cost consumed in individually designing and purchasing a PIM measurement device or a zig according to the type of port of an RF component may be reduced. In addition, the PIM automatic measurement device does not require that a user put effort into connecting a connector of the PIM measurement device to a port of an RF component through automatic connection therebetween, and thus unnecessary time and effort consumed therein may be reduced. In addition, the phase of a signal emitted from an RF component may be conveniently changed by a user by simply inputting desired phase instead of changing the phase of the signal by individually operating a motor. 
     In addition, the PIM automatic measurement device may further include one or more first connection parts disposed on the upper surface of the first plate, one end of the first connection part being connected to the first connector and another end thereof is connected to the first movement controller, and the first connector may be connected to the first connection part by a plate spring. 
     In addition, the PIM automatic measurement device may further include one or more first rail parts disposed on the upper surface of the first plate to allow the first connection part to move either forward or backward, one or more second connection parts disposed on the lower end of the first plate, one end of the second connection part being connected to the second plate and another end thereof being connected to the second movement controller, one or more second rail parts disposed on a lower surface of the first plate to allow the second plate to move either forward or backward, a third plate disposed at a lower end of the second connector to support the second connector, and a fixing part connecting the second plate and the third plate to each other to be fixed. The first movement controller and the second movement controller may be configured as any one of an air cylinder, a hydraulic pump, and an electric motor. 
     Meanwhile, the second connector may further include a remote electrical tilt (RET) motor to tilt a phase of a signal emitted from an antenna, upward/downward height adjustment and leftward/rightward movement of the first and second connectors may be enabled, and the PIM automatic measurement device may further include a shelf part allowing an radio frequency (RF) component having one or more ports connected to the first and second connectors to be mounted thereon. In this regard, the shelf part further may include a vibrator to vibrate the RF component, and the PIM automatic measurement device may further include a cover member including the shelf part therein, an inner wall of the cover member being filled with an electromagnetic wave absorbing material. 
     Lastly, the PIM automatic measurement device may further include a first controller to control ON/OFF of the first and second movement controllers and a second controller to control a tilt angle of the RET motor. 
     Advantageous Effects 
     According to the present invention, a PIM measurement device can measure PIM of all RF components regardless of the type of ports of the RF components, and thus time and cost consumed in individually designing and purchasing a PIM measurement device or a zig according to the type of port of an RF component can be reduced. 
     In addition, the PIM measurement device does not require that a user put effort into connecting a connector of the PIM measurement device to a port of an RF component through automatic connection therebetween, and thus unnecessary time and effort consumed therein can be reduced. 
     In addition, the phase of a signal emitted from an RF component can be conveniently changed by a user by simply inputting desired phase instead of changing the phase of the signal by individually operating a motor. 
     Meanwhile, effects of the present invention are not limited to the effects set forth herein, and various other effects may be inferred from the following description within a range obvious to those of ordinary skill in the art. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a top view of a PIM automatic measurement device according to an embodiment of the present invention. 
         FIG. 2  is a front view of the PIM automatic measurement device according to an embodiment of the present invention. 
         FIG. 3  is a view of antenna ports for PIM measurement. 
         FIG. 4  is a view of a plate spring involved in height adjustment and leftward/rightward movement of a first connector. 
         FIG. 5  is a view illustrating a state before the first connector is moved forward by a first movement controller. 
         FIG. 6  is a view illustrating a state in which the first connector is being moved forward by the first movement controller. 
         FIG. 7  is a side view of the PIM automatic measurement device according to an embodiment of the present invention. 
         FIG. 8  is a view illustrating a state before a second connector is moved forward by a second movement controller. 
         FIG. 9  is a view illustrating a state in which the second connector is being moved forward by the second movement controller. 
         FIG. 10  is a view of a cover member including a shelf part. 
         FIG. 11  is a view of a first controller. 
         FIG. 12  is a view illustrating a state in which the PIM automatic measurement device according to an embodiment of the present invention is mounted on a support and connected to one end of a cover member. 
     
    
    
     Meanwhile, reference numerals used in the drawings are as follows: 
       100 : PIM automatic measurement device 
       10 : first plate 
       20 : first connector 
       21 : coaxial cable  25 : first connection part 
       26 : plate spring  28 : second rail part 
       30 : first movement controller 
       40 : second plate 
       50 : second connector 
       55 : second connection part 
       60 : second movement controller 
       70 : third plate 
       82 : shelf part  83 : cover member  87 : first controller 
     MODE 
     Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments set forth herein are provided so that the spirit of the present invention can be understood by those of ordinary skill in the art without undue difficulty, and the present invention is not limited to the embodiments. Detailed explanations of related known configurations or functions will be omitted when such detailed explanations might unnecessarily obscure the essence of the invention. 
     In addition, the details illustrated in the accompanying drawings are intended to clearly explain embodiments of the present invention and thus the shapes thereof may be different from actual shapes thereof, and it should be noted that the same reference numerals in each drawing possibly denote the same elements although illustrated in other drawings. 
     In addition, it will be understood that the expression “including” certain elements as used herein is an open expression and simply refers to the presence of the corresponding elements, but does not preclude the presence of additional elements. 
       FIG. 1  is a top view of a PIM automatic measurement device  100  according to an embodiment of the present invention. 
     The PIM automatic measurement device  100  includes a first plate  10 , a first connector  20 , a first movement controller  30 , a second plate  40 , a second connector  50 , and a second movement controller  60 , and an upper surface of the PIM automatic measurement device  100  includes the first plate  10 , the first connector  20 , and the first movement controller  30 . 
     Meanwhile, an RF component may include all components that emit RF signals, but, in the present specification, an antenna will be described as the RF component for clarity of explanation. 
     The first plate  10  is a configuration positioned at the center of the PIM automatic measurement device  100  according to an embodiment of the present invention, in which the first connector  20  is positioned on an upper surface of the first plate  10 , and the second connector  50  is positioned on a lower surface thereof. This will be described below in detail in the corresponding description. The first plate  10  has to support structures disposed on the upper surface thereof such as the first connector  20 , the first movement controller  30 , and the like, and thus may be made of a metal material with predetermined thickness and hardness sufficient to support the weights of the structures. For example, the first plate  10  may be made of a hard metal material such as an iron or aluminum alloy or the like, having a thickness of 2 cm to 3 cm, and the metal material and thickness of the first plate  10  may be appropriately adjusted. 
     Meanwhile, the first plate  10  may have a sufficient area to include all the structures positioned on the upper surface of the first plate  10 , but, to minimize an overall size of the PIM automatic measurement device  100 , may have an area such that the size of an empty space where no structures are disposed may be minimized. 
     The first connector  20  is positioned on the upper surface of the first plate  20 . In particular, the first connector  20  is configured in a certain arrangement form such that one or more first connectors  20  are connected to one or more first connection parts  25 . Referring to  FIG. 2 , it can be confirmed that the first connector  20  is configured in a certain arrangement form, and, assuming that connectors are denoted as 1 st  to 6 th  connectors from the first connector  20  on the left side, the 2 nd  and 5 th  connectors protrude upward more than the remaining connectors. Such arrangement of the first connectors  20  corresponds to arrangement of upper ports of an antenna to which the first connectors  20  are connected. That is, in the case of ports (e.g., 1 st  to 6 th  ports) of an antenna of  FIG. 3 , connected to the first connectors  20  of  FIG. 2 , the 2 nd  to 5 th  ports also protrude upward more than the other ports. In addition, upward/downward height adjustment and leftward/rightward movement of the first connectors  20  may be performed by a rail (not shown) and a plate spring  26  formed at one end of the first connector  25 , which will be described below, and thus, even when an antenna for PIM measurement has a different arrangement of ports from that illustrated in  FIG. 3 , the first connectors  20  may be connected to the PIM automatic measurement device  100  without any difficulty. Through such configuration, time and cost consumed in designing and purchasing a separate PIM measurement device for measuring PIM of an antenna including different port arrangement may be reduced. Meanwhile, one or more coaxial cables  21  are connected to rear surfaces of the first connectors  20  to provide feed signals for operating an antenna connected for PIM measurement. 
     The first connection part  25  is configured in singular or plural on the upper surface of the first plate  10  to connect the first connectors  20  to the first movement controller  30 , which will be described below. In particular, the first connection part  25  may be provided in the same number as that of the first connectors  20 , and one end of the first connection part  25  is connected to the first connector  20 , and another end thereof is connected to the first movement controller  30 . In addition, a rail (not shown) with a predetermined shape may be provided at one end of the first connection part  25  connected to the first connector  20  to enable upward/downward height adjustment and leftward/rightward movement of the first connectors  20 . That is, the height adjustment and leftward/rightward movement of the first connectors  20  may be performed by a rail (not shown) formed at one end of the first connection part  25 . Due to this, the first connection part  25  may be provided in the same number as that of the first connectors  20 . This is because, when two or more first connectors  20  are simultaneously connected to the first connection part  25 , there is the possibility of unnecessary collision between the two or more first connectors  20  when performing height adjustment and leftward/rightward movement. However, on the premise that there is no collision between the two or more first connectors  20  simultaneously connected to the first connection part  25  due to non-overlapping of leftward/rightward movement paths, the first connection part  25  may be provided in number different from that of the first connectors  20 , if necessary. Meanwhile, the first connector  20  may be provided, at a rear surface thereof, with a groove with a predetermined depth at a position corresponding to a rail formed at one end of the first connection part  25 , thereby smoothly performing the height adjustment and leftward/rightward movement of the first connectors  20 . In addition, the first connection part  25  may also be provided, at one end thereof, with other means for guiding height adjustment and leftward/rightward movement of the first connectors  20 , in addition to a rail (not shown) with a predetermined shape. For example, as illustrated in  FIG. 4 , the first connection part  25  may be provided with the plate spring  26  at one end thereof. In particular, the plate spring  26  is disposed between the first connection part  25  and the first connector  20 , and enables height adjustment and leftward/rightward movement of the first connectors  20 . In this case, different from the case of using a rail (not shown), there is no need to form a groove with a predetermined depth at a rear surface of the first connector  20 , and thus manufacturing processes may be simplified and manufacturing costs may be reduced. 
     Meanwhile, the first connection part  25  may be positioned on one or more first rail parts (not shown) disposed on the upper surface of the first plate  10  and move either forward or backward. In this case, the first connection part  25  may be provided, at a lower surface thereof, with a groove with a predetermined depth formed at a position corresponding to the first rail part (not shown), and thus may smoothly move either forward or backward. In particular, when the first connection part  25  moves forward, the first connector  20  connected to the one end of the first connection part  25  may be connected to a port of an antenna for PIM measurement and, when the first connection part  25  moves backward, the first connector  20  may be disconnected from the port of the antenna. That is, the first rail part (not shown) may guide forward/backward movement paths of the first connection part  25  and thus enable the first connector  20  to be connected to or disconnected from the port of an antenna. Meanwhile, it should be understood that the first rail part (not shown) is formed on the upper surface of the first plate  10 , and the first connection part  25  is formed thereon, and thus the first rail part is not shown in the drawings and, accordingly, is not specifically illustrated in the accompanying drawings, but the first rail part (not shown) should be regarded as being formed in all the drawings. In addition, the first plate  10  is provided with one or more second rail parts  28  at the lower surface of the first plate  10 , and a detailed description thereof will be provided below in the corresponding description. 
     The one or more first connectors  20  may be connected to one end of the one or more first connection parts  25 , and thus the upward/downward height adjustment and leftward/rightward movement thereof are enabled by a rail (not shown) and the plate spring  26 . In addition, the first connector  20  may be connected to or disconnected from a port of an antenna as the first connection part  25  formed on the first rail part (not shown) moves either forward or backward. Thus, it is very important to control the forward/backward movement of the first connection part  25 , and thus the first movement controller  30  that enables this will now be described. 
     The first movement controller  30  is configured in singular or plural on the upper surface of the first plate  10 , and controls forward or backward movement of the first connector  20 . In particular, when the first movement controller  30  is in an ON-state through connection to another end of the first connection part  25 , one end of which is connected to the first connector  20 , the first connection part  25  is itself moved and, accordingly, the first connector  20  may also move together with the first connection part  25 . Referring to  FIGS. 5 and 6 , it can be confirmed that, when the first movement controller  30  is in an ON-state, the first connection part  25  and the first connector  20  simultaneously move forward, and the first connector  20  is automatically connected to a port of an antenna for PIM measurement. 
     Meanwhile, the first movement controller  30  may be selected from any one of air cylinders, hydraulic pumps, and electric motors, the first connection part  25  may be moved only by movement of the first movement controller  30  itself, but may be moved by a predetermined bar (not shown) additionally disposed between the first movement controller  30  and the first connection part  25 . For example, when the first movement controller  30  is configured as an air cylinder, a bar (not shown) may be moved forward by instantaneously injecting air into the cylinder, and, accordingly, the first connection part  25  and the first connector  20  may move forward. In addition, when the first movement controller  30  is configured as a hydraulic pump, similarly, a bar (not shown) may be moved forward by applying pressure to the inside of the pump, and, accordingly, the first connection part  25  and the first connector  20  may move forward. Lastly, when the first movement controller  30  is configured as an electric motor, a bar (not shown) may be moved forward by operation of the motor, and, accordingly, the first connection part  25  and the first connector  20  may move forward. As such, as the first connection part  25  moves forward by the first movement controller  30 , the first connector  20  connected to one end of the first connection part  25  may be automatically connected to a port of an antenna for PIM measurement. In particular, in a state in which the pressure applied to the inside of the air cylinder or the hydraulic pump is maintained or the electric motor is being operated, while fixing the first connection part  25  forward, a state in which the first connector  20  is connected to the port of an antenna may be continuously maintained. In contrast, when the first movement controller  30  is in an OFF state, the first connector  20  is disconnected from the port of an antenna. For example, in a case in which the first movement controller  30  is configured as an air cylinder, when the first movement controller  30  is in an OFF state, air injected into the cylinder is discharged and thus a bar (not shown) moves from front to back and, accordingly, the first connection part  25  also moves backward, resulting in disconnection of the first connector  20  from the port of an antenna. In addition, in a case in which the first movement controller  30  is configured as a hydraulic pump, similarly, the pressure inside the pump is decreased and thus a bar (not shown) moves from front to back and, accordingly, the first connection part  25  also moves backward, resulting in disconnection of the first connector  20  from the port of an antenna. Lastly, in a case in which the first movement controller  30  is configured as an electric motor, the motor operates in a direction opposite to that in which the motor pushes a bar (not shown) forward and thus the bar (not shown) moves from front to back and, accordingly, the first connection part  25  also moves backward, resulting in disconnection of the first connector  20  from the port of an antenna. Meanwhile, it is obvious that such forward or backward movement of the first connection part  25  is performed on the first rail part (not shown). 
     As described above, according to the ON/OFF state of the first movement controller  30 , the bar (not shown) or the first connection part  25  may move either forward or backward and, accordingly, the first connector  20  may be automatically connected to or disconnected from the port of an antenna for PIM measurement. Thus, a connector of the PIM measurement device and a port of an antenna for PIM measurement may be automatically and conveniently connected to and disconnected from each other without requiring efforts of a user. In addition, the first movement controller  30  may be configured as any means for applying a predetermined pressure so that the bar (not shown) or the first connection part  25  and the first connector  20  move forward, in addition to the air cylinder, the hydraulic pump, or the electric motor as described above. 
     A detailed description of the first connector  20  disposed on the upper surface of the first plate  10  of the PIM automatic measurement device  100  according to an embodiment of the present invention and connected to a port of an antenna for PIM measurement and the first movement controller  30  to control forward or backward movement of the first connector  20  has been provided. Hereinafter, configurations related to the second connector  50  capable of changing the phase of a signal emitted from an antenna for PIM measurement will be described. This is another major part of configurations of the present invention and is related to configurations formed on a lower end of the first plate  10 . 
       FIG. 7  is a side view of the PIM automatic measurement device  100  according to an embodiment of the present invention. Referring to  FIG. 7 , the second plate  40 , the second connector  50 , and the second movement controller  60  that are disposed at a lower end of the first plate  10  can be confirmed. 
     The second plate  40  is disposed on the lower end of the first plate  10 . In particular, one or more second rail parts  28  disposed on the lower surface of the first plate  10  are provided with a groove with a predetermined depth that allows forward or backward movement. In addition, the second plate  40  does not include predetermined configurations on an upper surface thereof as in the first plate  10 , and is a configuration that is moved either forward or backward simply by the second movement controller  60 , which will be described below, and thus has a smaller area than that of the first plate  10 , thereby minimizing the overall size of the PIM automatic measurement device  100 . 
     The second connector  50  is configured in singular or plural at a lower end of the second plate  40 , and, in particular, is supported by a third plate  70  disposed at a lower end of the second connector  50 . That is, as illustrated in  FIG. 7 , the second connector is disposed between the second plate  40  and the third plate  70 . In addition, the second connector  50  has to move together as the second plate  40  moves either forward or backward, and thus an upper surface of the second connector  50  may be strongly connected to a lower surface of the second plate  40  via a predetermined structure. For example, the upper surface of the second connector  50  and the lower surface of the second plate  40  may be fastened with a bolt or may be connected by a predetermined adhesive. In another embodiment, instead of connecting the lower surface of the second plate  40  to the upper surface of the second connector  50 , an additional means such as a fixing part (not shown) that connects the second plate  40  and the third plate  70  to each other may be configured so that the third plate  70  moves together with movement of the second plate  40  and, accordingly, the second connector  50  supported by the third plate moves therewith. That is, in any case, the second plate  40  is the center of movement, and the second plate  40  may be connected to the second connector  40  or the third plate  70 . 
     Meanwhile, the second connector  50  is connected to a phase modification port of an antenna for PIM measurement. Generally, an antenna including multiple ports includes a separate phase modification port for adjusting the phase of a signal emitted from the antenna, and the second connector  50  may be connected to a lower port from among ports of an antenna for PIM measurement illustrated in  FIG. 3 . In addition, the second connector  50  may also be configured in the same manner as in the first connector  20  described above so as to enable upward/downward height adjustment and leftward/rightward movement, and thus may be connected to the PIM automatic measurement device  100  without any problem even when an antenna for PIM measurement includes a phase modification port arrangement different from what is illustrated in  FIG. 3 . 
     In addition, the second connector  50  is connected to the phase modification port of an antenna for PIM measurement, and thus includes a predetermined driving means capable of tilting the phase of a signal emitted from the antenna. The driving means may be a motor, in particular, a remote electrical tilt (RET) motor. Referring to  FIG. 6 , it can be confirmed that an additional configuration with a rectangular parallelepiped shape is disposed at a rear surface of the second connector  50 , and a driving means may be inserted thereinto. Meanwhile, the second connector  50  may also include any driving means capable of tilting the phase of a signal emitted from an antenna, in addition to the RET motor. 
     The second connection part  55  is configured in singular or plural at the lower end of the first plate  10 , and one end of the second connection part  55  is connected to the second plate  40  and another end thereof is connected to the second movement controller  60 , which will be described below. It has already been described above that, as the second plate  40  moves either forward or backward, the second connector  50  moves together. That is, the second connection part  55  serves to transmit force transmitted by the second movement controller  60  to the second plate  40 . In particular, when the second movement controller  60  moves the second connection part  55  forward, the second plate  40  also moves forward, and, when the second movement controller  60  moves the second connection part  55  backward, the second plate  40  also moves backward. That is, the second connection part  55  is a configuration such as a predetermined bar (not shown) described above with respect to the first movement controller  30 , and may have various shapes such as a bar shape, a plate shape, and the like. A reason why the second connection part  55  is needed is that the lower end of the first plate  10  has spatial restriction in order to minimize the overall size of the PIM automatic measurement device  100 , and does not have a space sufficient for the second movement controller  60  to directly move the second plate  40 , unlike the upper surface of the first plate  10 . However, the second movement controller  60  may directly move the second plate  40  without the second connection part  55  so long as there is a sufficient space. 
     The second movement controller  60  is configured in singular or plural on the rear surface of the second plate  40  to control forward or backward movement of the second connector  50 . In particular, when in an ON state via connection to another end of the second connection part  55 , the second movement controller  60  moves the second connection part  55  itself, and, accordingly, the second plate  40  connected to one end of the second connection part  55  moves therewith and, consequently, the second connector  50  moves. Referring to  FIGS. 8 and 9 , it can be confirmed that, when the second movement controller  60  is in an ON state, the second connection part  55 , the second plate  40 , and the second connector  50  move in unison, and the second connector  50  is automatically connected to the phase modification port of an antenna for PIM measurement. 
     Meanwhile, the second movement controller  60  may also be configured by selecting any one of an air cylinder, a hydraulic pump, and an electric motor, and the second plate  40  may be moved only by movement of the second movement controller  60  itself, but the second connection part  55  may be further configured due to spatial restriction to move the second plate  40 . Operation of the second movement controller  60  will now be described. For example, when the second movement controller  60  is configured as an air cylinder, the second connection part  55  may be moved forward by instantaneously injecting air into the cylinder, and, accordingly, the second plate  40  and the second connector  50  may move forward. In addition, when the second movement controller  60  is configured as a hydraulic pump, similarly, the second connection part  55  may be moved forward by applying pressure to the inside of the pump, and, accordingly, the second plate  40  and the second connector  50  may move forward. Lastly, when the second movement controller  60  is configured as an electric motor, the second connection part  55  may be moved forward by operation of the motor, and, accordingly, the second plate  40  and the second connector  50  may move forward. As such, as the second connection part  55  moves forward by the second movement controller  60 , the second plate  40  connected to one end of the second connection part  55  also moves forward, and the second connector  50  may be automatically connected to the phase modification port of an antenna for PIM measurement. In particular, in a state in which the pressure applied to the inside of the air cylinder or the hydraulic pump is maintained or the electric motor is being operated, while fixing the second connection part  55  forward, a state in which the second connector  50  is connected to the phase modification port of an antenna may be continuously maintained. In contrast, when the second movement controller  60  is in an OFF state, the second connector  50  is disconnected from the phase modification port of an antenna. For example, in a case in which the second movement controller  60  is configured as an air cylinder, when the second movement controller  60  is in an OFF state, air injected into the cylinder is discharged and thus the second connection part  55  moves from front to back, and, accordingly, the second plate  40  also moves backward and thus the second connector  50  is disconnected from the phase modification port of an antenna. In addition, in a case in which the second movement controller  60  is configured as a hydraulic pump, similarly, the pressure inside the pump is decreased and thus the second connection part  55  moves from front to back and, accordingly, the second plate  40  also moves backward, resulting in disconnection of the second connector  50  from the phase modification port of an antenna. Lastly, in a case in which the second movement controller  60  is configured as an electric motor, the motor operates in a direction opposite to that in which the motor pushes the second connection part  55  forward and thus the second connection part  55  moves from front to back and, accordingly, the second plate  40  also moves backward, resulting in disconnection of the second connector  50  from the phase modification port of an antenna. Meanwhile, it is obvious that such forward or backward movement of the second plate  40  is performed on a second rail part  28 . 
     As described above, according to the ON/OFF state of the second movement controller  60 , the second connection part  55  may move either forward or backward and, accordingly, the second connector  50  connected to the second plate  40  may be automatically connected to or disconnected from the phase modification port of an antenna for PIM measurement. Thus, a connector of the PIM measurement device and a phase modification port of an antenna for PIM measurement may be automatically and conveniently connected to and disconnected from each other without requiring efforts of a user. In addition, the second movement controller  60  may also be configured as any means for applying a predetermined pressure so that the second connection part  55  or the second plate  40  and the second connector  50  move forward, in addition to the air cylinder, the hydraulic pump, or the electric motor as described above. 
     A detailed description of the second connector  50  disposed on the lower end of the first plate  10  of the PIM automatic measurement device  100  according to an embodiment of the present invention and connected to the phase modification port of an antenna for PIM measurement and the second movement controller  60  to control forward or backward movement of the second connector  50  has been provided. By using the second movement controller  60 , there may be no need to change the phase of a signal by individually operating a motor on the phase modification port of an antenna for PIM measurement by a user as known in the art. 
     Meanwhile, the PIM automatic measurement device  100  according to an embodiment of the present invention may further include a shelf part  82 , a vibrator (not shown), a first controller  87 , and a second controller (not shown), which are additional configurations, and these additional configurations will now be described. 
     The shelf part  82  allows an antenna for PIM measurement, connected to the first connector  20  and the second connector  50 , to be mounted thereon. In addition, as illustrated in  FIG. 10 , the shelf part  82  may be included in a cover member  83  having, for example, a box shape with an opening at one surface thereof to minimize ambient impact during PIM measurement. In this regard, formation of the opening of the cover member  83  is performed because the first and second connectors  20  and  50  have to be connected to a port of an antenna, and an inner wall of the cover member  83  may be filled with an electromagnetic wave absorbing material. In addition, the shelf part  82  may have a flat shape so that the antenna mounted thereon maintains a horizontal state. 
     Meanwhile, the shelf part  82  may further include a vibrator (not shown) to vibrate the antenna. In the case of existing PIM measurement devices, a user provides intended vibration with a hard tool, such as a hammer, to simulate an ambient environment, such as wind pressure or the like, in which antennas are actually installed. However, in the present invention, vibration may be conveniently provided to the antenna without requiring efforts of a user, and the vibrator may be configured so as to adjust the intensity of vibration, and thus a variety of ambient environments may be virtually simulated. 
     In addition, the PIM automatic measurement device  100  according to an embodiment of the present invention may further include the first controller  87  to control ON/OFF states of the first and second movement controllers  30  and  60  as described above and a driving means included in the second connector  50 , in particular, the second controller (not shown) to control a tilt angle of an RET motor. In this regard, as illustrated in  FIG. 11 , the first controller  87  may include buttons for individually performing ON/OFF of the first and second movement controllers  30  and  60 , and the second controller (not shown) may include levers capable of adjusting a predetermined angle according to an individual RET motor. In addition, the second controller (not shown) may be a configuration such as a computer with an embedded program for controlling a tilt angle of a motor. Meanwhile, the ON/OFF operation or intensity of vibration of the vibrator (not shown) may be controlled using a separate button provided on the first controller  87  or additional individual controllers. In addition, the first controller  87  and the second controller (not shown) may also be configured as a single controller. 
     Meanwhile, as illustrated in  FIG. 12 , the PIM automatic measurement device  100  according to an embodiment of the present invention may be positioned on a predetermined support and connected to one end of the cover member  83  including the shelf part  82 . In particular, the support with the PIM automatic measurement device  100  positioned thereon and a connection part of the cover member  83  may be configured in an opening and closing form, such as a door. Through such configuration, after an antenna for PIM measurement is mounted on the shelf part  82  positioned in the cover member, and is positioned close to the opening of the cover member  83  by moving the support, the first and second connectors  20  and  50  may be connected to ports of an antenna through the first controller  87  and the second controller (not shown), thereby readily measuring PIM of the antenna. In this case, the support or the cover member  83  may further include a predetermined fixing member capable of fixing the support positioned close to the cover member. In addition, the support may further include a configuration such as a rotatable wheel at a lower end thereof to be movable on the ground. 
     The above-described embodiments of the present invention are provided only for illustrative purposes, and are not intended to limit the scope of the present invention. In addition, it is obvious to those of ordinary skill in the art to which the present invention pertains that various changes and modifications may be made within the spirit and scope of the present invention, and these changes and modifications should be construed as being within the scope of the present invention.