Patent Publication Number: US-11652263-B2

Title: Phase shifter including a fixed board unit and at least one moving board unit, where a guide bracket guides the at least one moving board unit relative to the fixed board unit

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/KR2019/008459, filed on Jul. 10, 2019, which claims the benefit of Korean Patent Application NO. 10-2018-0080786, filed on Jul. 11, 2018, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein in their entirety by reference. 
    
    
     BACKGROUND 
     1) Field 
     The disclosure relates to a phase shifter. 
     2) Description of Related Art 
     The statements in this section merely present background knowledge for the disclosure, and do not necessarily constitute prior art. 
     Horizontal beam antennas are most efficient in terms of coverage, but may need to be designed to be inclined at an angle due to interference or loss. In this case, mechanically installing antennas inclined downwards involves a huge troublesomeness for several reasons such as the need for an operator to visit on site and shut off a power supply during the operation. In order to avoid such troublesomeness, an electrical beam tilt scheme is used rather than the above mechanical beam tilt schemes. 
     The electrical beam tilt scheme is multiple phase shifters (MLPS) based scheme. The electrical beam tilt scheme is the way shifts phase difference of signals fed to each of radiating elements of the antenna arranged vertically. Techniques related to the electrical beam tilt scheme have been described U.S. Pat. No. 6,864,837, etc. 
     On the other hand, in general, a phase shifter must be provided for the electrical beam tilting. The phase shifter is used in various fields, including beam control of phased array antennas, to perform a phase modulation function at an RF analog signal processing stage. A principle of the phase shifter is to appropriately delay an input signal so that the phase difference between the input and output signals is generated, and this may be implemented by changing a physical length of a transmission line, changing a signaling speed in the transmission line, and the like. 
     The technique related to these phase shifters is exemplified by U. S. Patent Publication NO. 2005/0248494, which discloses a fixed board unit having one input port and five pairs of output ports and a moving circuit board having a conductive strip. However, the above prior art has a structure in which a fixed board unit and a moving circuit board are provided only on one surface of the phase shifter, and the space of the phase shifter is not fully utilized. Further, there are disadvantages that the moving parts have become less durable because of the repeated physical contacts of the protruded portions of the moving parts, and it is difficult to cope with changes of transmission range due to the limitation on the slot length. 
     On the other hand, antennas used extensively in recent years in base stations and repeaters in mobile communication systems are often multiband frequency antennas for various bandwidth services. Such multiband antennas need to individually adjust phases of several band frequencies. Individual phase adjustment of several band frequencies requires more phase shifters, and there is a problem associated with spatial constraints. 
     In order to address these issues, a method of assigning more space to the phase shifter from an inner space of the antenna is used, but this causes a problem that an actual space for antenna elements is reduced. 
     SUMMARY OF THE INVENTION 
     Accordingly, the disclosure is to provide a phase shifter having a simple configuration and capable of being reduced in size and weight. 
     The disclosure is also to provide a phase shifter which enhances the space utilization to occupy less space in an antenna. 
     Moreover, the disclosure is to provide a phase shifter easy to repair and reassemble. 
     According to an embodiment of the present invention, provided is a phase shifter including: an elongated fixed board unit including one or more fixed circuit boards, each circuit board having a circuit pattern formed on one surface thereof, a guiding bracket surrounding the fixed board unit and fixed to the fixed board unit, and one or more moving board units disposed between the guiding bracket and at least one surface of the fixed board unit, guided by the guiding bracket, and including one or more moving circuit boards having conductive strips formed thereon that are coupled to the circuit patterns on the fixed circuit boards. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a phase shifter in accordance with an embodiment of the disclosure; 
         FIG.  2    is a cross-sectional view of a portion ‘A-A’ in  FIG.  1   ; 
         FIG.  3    is an exploded perspective view of the phase shifter in accordance with an embodiment of the disclosure; 
         FIG.  4 A  is a perspective view showing a construction of a moving board unit of the phase shifter in accordance with an embodiment of the disclosure; 
         FIG.  4 B  is a perspective bottom view showing elements of the moving board unit of the phase shifter and combinatorial relationships in accordance with an embodiment of the disclosure; 
         FIG.  5    is a top view of a fixed board unit and a bottom view of the moving board unit of the phase shifter in accordance with an embodiment of the disclosure; 
         FIG.  6 A  is a perspective view showing a guiding bracket of the phase shifter with being coupled in accordance with an embodiment of the disclosure; and 
         FIG.  6 B  is a perspective view showing the guiding bracket of the phase shifter with being separated in accordance with an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the following, some embodiments of the disclosure will be described in detail with reference to illustrative drawings. It should be noted that, in labeling each element in the drawings with reference numbers, whenever possible, the same elements are intended to have the same reference numbers even though the same elements are indicated in different drawings. In addition, in describing the disclosure, known components or features involved are not described in detail in order not to obscure the subject matter of the disclosure. 
     The designations such as “a first”, “a second”, “i)”, “ii)”, “a)”, “b)”, and so forth may be used herein to describe the components of the embodiments according to the disclosure. The above designations are just to distinguish one element from the other elements, and do not limit the essence or sequence, order or the like of those components. As used herein, reference to “include,” “includes,” “including,” “comprise,” “comprises,” “comprising,” or any variation thereof, indicates that any part that comprises any element does not exclude any other elements, but may also include other elements, unless expressly stated otherwise. 
     In the specification, let the x-axis direction in  FIG.  1    be set to “crosswise”; let the y-axis direction be set to “lengthwise”; and let the z-axis direction be set to be “elevational”. Meanwhile, let “widthwise” be used in the same meaning as “crosswise” and “longitudinal” be used in the same meaning as “lengthwise” to describe with reference to a fixed board unit  100 . 
       FIG.  1    is a perspective view of a phase shifter in accordance with an embodiment of the disclosure. 
     Referring to  FIG.  1   , the phase shifter according to an embodiment of the disclosure includes a fixed board unit  100 , a moving board unit  200 , and a guiding bracket  300 . 
     The phase shifter may also include a holder  400  for connecting an external device and the phase shifter according to an embodiment of the disclosure. 
     The fixed board unit  100  includes circuit patterns  111  which are signal transmission paths of antenna signals. The fixed board unit  100  includes one or more ports, through which the fixed board unit  100  may be connected with antenna cables. The circuit patterns  111  formed on the fixed board unit  100  receives the antenna signals from the antenna cables, and provides the transmission path of the antenna signals. 
     The moving board unit  200  is formed on one surface or the other surface of the fixed board unit  100 . The moving board unit  200  is prevented from being dislocated by the guiding bracket  300 . Further, the moving board unit  200  is guided by the guiding bracket  300  and may slide in the longitudinal direction of the fixed board portion  100 . The moving board unit  200  may be displaced on the fixed board unit  100  by sliding in the longitudinal direction of the fixed board unit  100 . This relative displacement of the moving board unit  200  with respect to the fixed board unit  100  may result in a change in shape or length of the transmission path of the antenna signals as described later. In this way, a phase of the antenna signals is shifted depending on the change of the transmission path of the antenna signals. 
     A system in which the moving board unit  200  is brought into contact with the fixed board unit  100  may be a surface contact system in that one surface of the moving board unit  200  comes into surface-to-surface contact with the circuit patterns  111  formed on the fixed board unit  100 . This surface contact system may cause the fixed board unit  100  and the moving board unit  200  to be relatively less damaged as compared to a point contact system such as, for example, a ball-type component brought into contacting with the circuit patterns  111 , etc. 
     On the other hand, the moving board unit  200  may be formed on both surfaces of the fixed board unit  100 . This is made possible by the guiding bracket  300  being located on both surfaces of the fixed board unit  100  to prevent dislocation of the moving board unit  200  from outer sides of the moving board unit  200 . 
     The embodiment has a construction in which the moving board unit  200  may be formed on both surfaces of the fixed board unit  100 , thereby enabling phase shift of the antenna signals on the both surfaces thereof. As such, since the phase shifter according to an embodiment of the disclosure enables phase shift on both surfaces of the fixed board unit  100 , the proposed phase shifter may achieve a smaller volume and enhance the utilization of a space as compared with a configuration capable of phase shifting only on one surface thereof. 
     One or more guiding brackets  300  are disposed around the fixed board unit  100 , and are fixed to the fixed board unit  100 . 
     Moreover, the guiding bracket  300  guides the moving board unit  200 , and the moving plate portion  200  may slide along the longitudinal direction of the fixed board portion  100  in a region defined by the guiding bracket  300 . In particular, the guiding bracket  300  has a rail structure as will be described later, and may smoothly guide the moving board unit  200  to reduce damage to the surfaces of the fixed board unit  100  and the moving board unit  200 . 
     The guiding bracket  300  may be composed of one or more segments, and in one embodiment of the disclosure, the two segments may be configured to be capable of being separated and coupled. By this configuration, the guiding bracket  300  may be easily separated and coupled, and the moving board unit  200  and the fixed board unit  100  constrained by the guiding bracket  300  may easily be separated or disassembled. In other words, the phase shifter according to the embodiment has such configuration that is easy to be separated or disassembled, thereby facilitating repair and reassembly. 
     The holder  400  may serve as a medium for coupling the phase shifter according to the embodiment to external components. The holder  400  is fixed on one side to the fixed board unit  100 , and is connected on the other side with fastening holes formed to other apparatuses external to the antenna. The phase shifter according to the embodiment and the external device may be directly connected through the fastening holes formed in the holder  400 , or may be engaged by means of a coupling element such as a bolt, etc. 
     On the other hand, since the holder  400  has a locking bar that is adjacent to the moving board unit  200  and is locked to the moving board unit  200 , the holder  400  may prevent the moving board unit from being dislocated. In this case, a position of the moving board unit  200  may be guided by both the guiding bracket  300  and the holder  400 , allowing the moving board unit  200  to be precisely positioned. 
       FIG.  2    is a cross-sectional view of a portion ‘A-A’ in  FIG.  1   . 
       FIG.  3    is an exploded perspective view of the phase shifter in accordance with an embodiment of the disclosure. 
     Now, elements of the phase shifter and combinational relationships in accordance with an embodiment of the disclosure is now described in detail with reference made to  FIGS.  2  and  3   . 
     The fixed board unit  100  ( FIG.  3   ) may have an elongated plate-like structure fixedly coupled to at least one side inside the antenna. The fixed board unit  100  includes the circuit patterns  111  ( FIG.  3   ) formed on at least one surface thereof. To be specific, the circuit patterns  111  ( FIG.  3   ) are formed on a fixed circuit board  110  of the fixed board portion  100 . 
     The circuit patterns  111  may be divided into a portion that is in contact with and coupled to strips  221  ( FIGS.  4 B and  5   ) formed on the mobile circuit board  220  ( FIG.  3   ) of the mobile board portion  200  and a portion that is not in contact with the strips  221 . Ports connected to separate cables are formed at ends of each of circuit patterns  111 , so that the antenna signals may be input or output. 
     Meanwhile, in one embodiment of the disclosure, the fixed board unit  100  may include a base board  120  and fixed circuit boards  110  formed on both surfaces thereof, wherein circuit patterns  111  may be formed on each of the surfaces of two fixed circuit boards  110 . 
     In this case, the base board  120  may be made from a material having a high dielectric constant. This is to prevent an electric field generated from the fixed circuit boards  110  formed on one side of the base board  120  from affecting current signals flowing through the fixed boards  110  formed on the other side of the base board  120 . 
     The current signals flow through the circuit patterns  111  of the fixed circuit boards  110 , and an induced electric field may be formed due to the flow of the current signals. In the phase shifter according to an embodiment of the disclosure, the current signals may flow not only on one surface of the fixed board unit  100  but also on the other side thereof. In such structure, there is a concern that the current signals flowing through the circuit patterns  111  formed on the other surface of the fixed board unit  100  are disturbed due to the induced electric field generated by the current signals flowing through the circuit patterns  111  formed in one surface of the fixed board portion  100 . 
     The embodiment may prevent an electric field generated from the fixed circuit board  110  disposed on one side of the base board  120  from affecting the signal flow on the fixed circuit board  110  located on the other side, by disposing the base board  120  having a high dielectric constant between the fixed circuit boards  110  on both sides. 
     In one embodiment of the disclosure, the base board  120  may be made from Teflon® material. Although the dielectric constant of the Teflon® varies depending on the measurement conditions, the base board  120  has a dielectric constant of approximately 2 or more, so as to effectively prevent the electric field generated from the fixed circuit board  110  disposed on one side of the base board  120  from affecting the fixed board  110  disposed on the other side of the base board  120 . 
     In addition, if the base board  120  is made from Teflon® material, the base board  120  may maintain the physical properties in a wide range of temperature, and has excellent heat-resisting property, which also prevents thermal damage to the fixing circuit board  110 . 
     On the other hand, side grooves  130  ( FIG.  3   ) may be formed at edges of the fixed board unit  100 . The guiding bracket  300  ( FIG.  2   ) may be fixed to the side grooves  130  of the fixed board unit  100 . Specifically, each of end portions of a first segment  310  or a second segment  320  constituting the guiding bracket  300  may be fastened. 
     Widths of the side grooves  130  may be equal to or slightly larger than widths of each of the end portions of the first segment  310  or the second segment  320  of the guiding bracket  300 . The side grooves  130  of the fixing circuit board  110  restrict a movement of the guiding bracket  300  in the longitudinal direction with respect to the fixed circuit board  110 . 
     The moving board unit  200  is disposed between the guiding bracket  300  and one surface of the fixed board unit  100 . 
     The moving board unit  200  may include a moving housing  210 , and a moving circuit board  220  ( FIG.  3   ) disposed within the moving housing  210 . On the other hand, Although the embodiment describes a configuration in which the moving housing  210  and the moving circuit board  220  are separated from each other as one example, alternatively, the moving board unit  200  may has a configuration where the moving housing  210  and moving circuit board  220  are integrally formed. The moving housing  210  may be disposed on one surface and the other surface of the fixed board unit  100 . 
     The moving circuit board  220  may be disposed in a space defined in the moving housing  210 . 
     The moving circuit board  220  may be on one surface thereof in contact with and coupled to circuit patterns  111  formed on the fixed circuit board  110 . 
     The contact state between the moving circuit board  220  and the fixed circuit board  110  changes as the moving board  220  slides on the fixed board portion  100  in conjunction with the sliding of the moving housing  210  along the longitudinal direction of the fixed board unit  100 . The length and shape of the transmission path of the antenna signals changes according to such change in the contact state. 
     The guiding brackets  300  are disposed on outer sides of the moving board unit  200 . 
     In one example, the guiding bracket  300  may be composed of the first segment  310  and the second segment  320 . The guiding bracket  300  may also include one or more rollers  330  and shafts  340  ( FIG.  2   ) connected to the first segment  310  and the second segment  320 , respectively. 
     The first segment may be disposed in one side region of the fixed board unit  100 . 
     The first segment  310  is coupled and fixed to the second segment  320  at end portions thereof, and one or both of end portions of the first segment  310  are disposed and fixed in the side grooves  130  formed in the fixed board unit  100 , thereby preventing dislocation in the longitudinal direction of the fixed board unit  100 . In this case, the widths of the end portions of the first segment  310  are snapped into the side grooves  130  such that the guiding bracket  300  may be prevented from being deviated. 
     The first segment  310  is engaged with the second segment  320  to prevent elevational dislocation, and is fixedly disposed in the side grooves  130  of the fixed board unit  100 , thereby being prevented from longitudinal dislocation. Thus, the shafts  340  coupled to the first segment  310  and the rollers  330  coupled to the first segment  310  are prevented from being dislocated. In addition, since the first segment  310  is in a fixed position, the moving board unit  200  disposed between the first segment  310  and the fixed board portion  100  is also prevented from being dislocated. 
     The second segment  320  may be disposed in the other side region of the fixed board unit  100 . 
     The second segment  320  is coupled and fixed to the first segment  310  at end portions thereof, and one or both of end portions of the second segment  320  are disposed and fixed in the side grooves  130  formed in the fixed board unit  100 , thereby preventing dislocation in the longitudinal direction of the fixed board unit  100 . In this case, the widths of the end portions of the second segment  320  are snapped into the side grooves  130  such that the guiding bracket  300  may be prevented from being deviated. 
     Further, the second segment  320  is engaged with the first segment  310  to prevent elevational dislocation, and is fixedly disposed in the side grooves  130  of the fixed board unit  100 , thereby being prevented from longitudinal dislocation. This also prevents the shafts  340  and the rollers  330  coupled to the second segment  320  from being dislocated. In addition, since the second segment  320  is in a fixed position, the moving board unit  200  disposed between the second segment  320  and the fixed board portion  100  is also prevented from being dislocated. 
     The rollers  330  may be connected to a shaft  340  coupled to the inner surfaces of the first segment  310  and the second segment  320 . 
     There could be a plurality of rollers  330  disposed. The plurality of rollers  330  may be spaced from one another. The distance between the plurality of rollers  330  may be equal to or slightly greater than a crosswise width of a guiding rib  211  of the moving housing  210 . In this case, the guiding rib  211  ( FIG.  2   ) is disposed in a space defined between the plurality of rollers  330 , so that the guiding rib  211  may be prevented from being dislocated crosswise. Accordingly, the plurality of rollers  330  may guide the moving board unit  200 . 
     One surface of the rollers  330  may be in contact with a portion of the one surface of a moving board unit  200  on which the guiding rib  211  is not formed. Specifically, one surface of the rollers  330  may be in contact with a surface of the moving housing  210  adjacent to the guiding rib  211 . The roller  330  may rotate about the shaft  340  while maintaining contact with one surface of the moving housing  210  when the moving board unit  200  slides along the longitudinal direction of the fixed board unit  100 . 
     Since the roller  330  maintains contact with the moving housing  210  of the moving board unit  200  when the moving board unit  200  slides, prevention of elevational vibrations of the moving board unit  200  to allow the moved board portion  200  to slide smoothly is possible. Also, the moving circuit board  220  hereby is prevented from elevational vibrations, so that the contact between the strip  221  formed on the moving circuit board  220  and the circuit pattern  111  formed on the fixed circuit board  110  may be stably maintained. 
     The shaft  340  is coupled to the inner surface of the guiding bracket  300 . For example, the shaft  340  may be rotatably coupled to the inner surface of the guiding bracket  300 . If the shaft  340  is rotatably coupled to the inner surface of the guiding bracket  300 , the roller  330  may be fixedly coupled to the shaft  340 . In this case, as the shaft  340  rotates, the roller  330  may also rotate. 
     On the other hand, the shaft  340  may be fixedly coupled to the inner surface of the guiding bracket  300 . Herein, the roller  330  is not fixedly coupled to the shaft  340 , but rather may be arranged so as to be rotatable on the shaft  340 . In this case, when the moving board unit  200  moves, the shaft  340  does not rotate, and only the roller  330  rotates independently. 
       FIG.  4 A  is a perspective view showing a construction of a moving board unit of the phase shifter in accordance with an embodiment of the disclosure. 
       FIG.  4 B  is a perspective bottom view showing elements of the moving board unit of the phase shifter and combinational relationships in accordance with an embodiment of the disclosure. 
     Now, individual elements of the moving board unit  200  ( FIGS.  1 - 3   ) of the phase shifter and combinational relationships in accordance with an embodiment of the disclosure is now described with reference made to  FIGS.  4 A and  4 B . 
     As previously described, the moving board unit  200  includes the moving housing  210  and the moving circuit board  220  as shown in  FIG.  3   . The moving board unit  200  may also include a leaf spring  230  ( FIG.  4 B ) between the moving housing  210  and the moving circuit board  220 . 
     The moving housing  210  may include a guiding rib  211  ( FIG.  4 A ) and moving board placements  212  ( FIG.  4 B ). 
     The guiding rib  211  may be formed on the outer surface of the moving housing  210 . In one embodiment of the disclosure, the guiding rib  211  protrudes from one surface of the moving housing  210 , and may be in a form extending in the longitudinal direction of the moving housing  210 . 
     The guiding rib  211  may be prevented from being dislocated by the guiding bracket  300  disposed adjacent to the outer sides of the moving housing  210 . The guiding rib  211  is prevented from being dislocated by the guiding bracket  300 , thereby preventing dislocation of the moving housing  210 . Specifically, as previously described, the roller  330  of the guiding bracket  300  prevents the guiding rib  211  and the moving housing  210  from being dislocated. 
     Furthermore, the guiding rib  211  is guided by the guiding bracket  300  during sliding of the moving housing  210 . The moving housing  210  hereby slides along the longitudinal direction of the fixed board unit  100  while being guided by the guiding bracket  300 . The presence of the guiding rib  211  prevents crosswise deviation of the moving circuit board  220  arranged inside the moving housing  210  with respect to the fixed board unit  100 , enabling a stable contact between the moving and fixed circuit boards  220 ,  110 . 
     On the other hand, a portion of an upper surface of the moving board unit  200  where the guiding rib  211  is not formed may be formed as a flat surface in one embodiment of disclosure. This flat surface may contact one surface of the roller  330 . This configuration enables stable contact of the strip  221  with the circuit pattern  111  by preventing the elevational vibrations of the moving housing  210  and the moving circuit board  220  during sliding of the moving board unit  200 , as previously described. 
     The moving board placement  212  is a space in which the moving circuit board  220  may be located. The moving board placement  212  is configured such that the space is defined between the moving housing  210  and the fixed board unit  100  in which the moving circuit board  220  may be located. The crosswise and lengthwise widths of the moving board arrangement  212  may be similar to or slightly larger than crosswise and lengthwise widths of the moving circuit board  220 . 
     As the moving circuit board  220  is placed in the moving board placement  212 , the moving circuit board  220  also slides on the fixed board unit  100  in conjunction with the sliding of the moving housing  210 , and the position of the moving circuit board  220  changes correspondingly. 
     An elastic leaf spring  230  may be disposed in a space defined between one surface of the moving board placement  212  and the moving circuit board  220 . The leaf spring  230  continuously presses the moving circuit board  220  toward the fixed board portion  100 , and hence the moving board  220  and the fixed board unit  100  may be kept in contact with each other stably. 
     On the other hand, a protruding pin  213  may be formed in the moving board placement  212 , which extends from the inner surface of the moving board arrangement portion  212 , in order to prevent lateral deviation of the moving circuit board  220  as shown in  FIG.  4 B . 
     In this case, a coupling hole  222  may be formed in the moving circuit board  220  for insertion of the protruding pin  213  of the moving board placement  212 , wherein the protruding pin  213  is inserted into the coupling hole  222  and fixes the moving circuit board  220 , whereby may prevent the lateral deviation and dislocation of the moving board  220 . On the other hand, a through hole through which the protruding pin  213  passes is formed in the leaf spring  230  is desirable. On the other hand, for insertion of the protruding pin  213 , a coupling hole rather than the coupling hole  222  ( FIG.  4 B ) may be formed in the moving circuit board  220 . 
     The moving circuit board  220  may be disposed in the moving board placement  212  of the moving housing  210 . The moving circuit board  220  includes a strip  221  disposed on a surface in contact with the fixed circuit board  110 . Again, the coupling hole  222  may be formed in the moving circuit board  220 . 
     The strip  221  formed on the moving circuit board  220  may be in contact with and coupled to the circuit pattern  111  formed on the fixed circuit board  110 . 
     The contact aspect between the strip  221  and the circuit pattern  111  changes as the moving circuit board  220  slides on one side surface of the fixed board portion  100  in conjunction with the sliding of the moving housing  210  along the longitudinal direction of the fixed board portion  100 . The contact state of the strip  221  and the circuit pattern  111  changes according to the displacement and placement state of a moving circuit board  220 , and the length and shape of the transmission path of the antenna signals change according to such change in the contact state. 
     The coupling hole  222  formed in the moving circuit board  220  is engaged with the protruding pin  213  formed on the moving housing  210  to fix the moving circuit board  220  to the moving housing  210 , whereby may prevent deviation and dislocation of the moving circuit board  220 . 
       FIG.  5    is a top view of the fixed board unit  100  and a bottom view of the moving board unit  200  ( FIG.  4 B ) of the phase shifter in accordance with an embodiment of the disclosure. 
     Referring now to  FIG.  5   , a process of coupling the strip  221  of the moving circuit board  220  to the circuit pattern  111  on the fixed circuit board  110  of the phase shifter according to an embodiment of the disclosure will be described. 
     In  FIG.  5   , shown is a configuration in which the strip  221  formed on the moving circuit board  220  is in a form of U-shaped, and each strip  221  has symmetry with respect to a central portion on the moving board unit  200 . However, that the shape and arrangement of the strips  221  may be configured differently as needed for design and modification of the circuit pattern  111  is evident. 
     Some of the circuit patterns  111  on the fixed circuit board  110  are in contact and coupled with strips  221  formed on a lower surface of the moving circuit board  220 . The moving circuit board  220  is located in the moving board placement  212  ( FIG.  4 B ) within the moving housing  210  and thus slides in the longitudinal direction of the fixed board portion  100  as the moving housing  210  moves. 
     As the moving circuit board  220  moves in the longitudinal direction of the fixed circuit board  110 , the contact state of the circuit pattern  111  and the strip  221  changes, and the signal path length and shape may change depending on such change in the contact state. Accordingly, the antenna signals are phase-shifted depending on changes in signal path length and shape as the moving circuit board  220  moves. 
       FIG.  6 A  is a perspective view showing a guiding bracket  300  of the phase shifter with being coupled in accordance with an embodiment of the disclosure. 
       FIG.  6 B  is a perspective view showing a guiding bracket  300  of the phase shifter with being separated in accordance with an embodiment of the disclosure. 
     Now, elements of the guiding bracket  300  of the phase shifter and combinational relationships in accordance with an embodiment of the disclosure is now described with reference made to  FIGS.  6 A-B . 
     The guiding bracket  300  may include a first segment  310  and a second segment  320 . 
     A first coupling part  311  is formed at one end of the first segment  310 , and a second coupling part  312  is formed at the other end of the first segment  310 . A third coupling part  321  ( FIG.  6 B ) is formed at one end of the second segment  320 , and a fourth coupling part  322  is formed at the other end of the second segment  320 . The first coupling part  311  is engaged with the third coupling part  321 , and the second coupling part  312  is engaged with the fourth coupling part  322 . 
     In one embodiment of the disclosure, the first coupling part  311  of the first segment  310  may be in a form that extends and projects from an end portion of one side of the first segment  310 . The first coupling part  311  may be configured to have a locking bar projecting outward from the first segment  310  and to which the third coupling part  321  is engaged, at one end. Also, the first coupling part  311  may be tapered on one surface so that the third coupling part  321  is readily engaged. 
     On the other hand, the third coupling part  321  of the second segment  320  may be in a form that extends and projects from an end portion of one side of the second segment  320 . The third coupling part  321  may be configured to have a locking bar projecting inward from the second segment  320  and to which the first coupling part  311  is engaged, at one end. Also, the third coupling part  321  may be tapered on one surface so that the first coupling part  311  is readily engaged. 
     The locking bar of the first coupling part  311  and the locking bar in the third coupling part  321  are engaged with each other to maintain the engagement between the first segment  310  and the second segment  320 . The first coupling part  311  and the third coupling part  321  may be elastic members to easy to fasten. 
     In one embodiment of the disclosure, the second coupling part  312  of the first segment  310  may be in a form that extends from an end portion of the other side of the first segment  310 , and projects outward of the first segment  310  at one end. 
     On the other hand, the fourth coupling part  322  of the second segment  320  may configured to extend from an end portion of the other side surface portion of the first segment  320 , and to have a locking groove or a locking hole to which the second coupling part  312  of first segment  310  may be engaged at one end. The end portion of the second coupling part  312  may be configured to have a locking bar that may be engaged to the locking groove or the locking hole of the fourth coupling part  322 . Also, the end portion of the second coupling part  312  may be tapered on one surface thereof so that the fourth coupling part  322  is readily engaged. 
     A width of the locking groove or the locking hole of the fourth coupling part  322  is formed to be similar to a width of the second coupling part  312 , whereby the second coupling part  312  may be steadily fixed in the longitudinal direction of the fixed board unit  100 . This locking groove or locking hole of the fourth coupling part  322  stops the second coupling part  312  from elevational movement as well as longitudinal movement with respect to the fixed board unit  100 , enabling the guiding bracket  300  to be securely fastened. 
     In other words, in one embodiment of the disclosure, it is possible to securely and conveniently fasten the first segment  310  and the second segment  320  by first fastening the second coupling part  312  and the fourth coupling part  322 , thereby preventing the first segment  310  and the second segment  320  from longitudinal movement with respect to the fixed board unit  100 , and then fastening the first coupling part  311  and the third coupling part  321 . 
     The foregoing describes the technical idea of the embodiment by way of illustration only, and thus various modifications and variations may be made by one of ordinary skill in the art to which the embodiment belongs without departing from the essential attributes of the embodiment. Therefore, the embodiments are intended to illustrate, and not to limit the technical idea of the embodiment, and the scope of the technical idea of the embodiment is not limited to these embodiments. It is intended that the scope of protection of the embodiment shall be interpreted as set forth in the following claims and to encompass all technical ideas falling within range of equivalents thereof.