Patent Publication Number: US-10763560-B2

Title: Wiper support device for a phase shifter comprising a wiper support resiliently compressed between a substrate and a cover

Description:
RELATED APPLICATION 
     The present application claims priority from and the benefit of Chinese Patent Application No. 20180081467.1, filed Jan. 29, 2018, the disclosure of which is hereby incorporated herein by reference in its entirety. 
     FIELD OF THE INVENTION 
     The present disclosure generally relates to a phase shifter. More specifically, the present disclosure relates to a wiper support device for a phase shifter. 
     BACKGROUND OF THE INVENTION 
     A phase shifter is a device capable of adjusting a phase of a wave. There are wide applications in such fields as radar, missile attitude control, communication, instrument and even music. The phase shifter, which organically combines transformer phase shift technology and the digital measurement technology, presents a high-precision phase shift adjustment, an accurate and visual reading, an adjustable output voltage and current, a favorable output waveform, a reliable operation and a convenient operation, so that the phase shifter can satisfy testing and checking of such instruments as single-phase and three-phase AC power and phase with a high precision, and can also be used in a test device of a meter. 
     In general, the phase shifter includes a wiper that presses against a PCB (printed circuit board) and is movable relative to the PCB to change a phase. It is known that, in an existing phase shifter, one end of the wiper is fixed relative to the PCB to serve as a center of rotation and the other end is rotatable about the center of rotation, thereby enabling the wiper to rotate with respect to the PCB. 
     The cost of the PCB is proportional to the area of the PCB; that is, the greater the area of PCB is, the higher the cost will normally be. Thus, a smaller phase shifter presents a cost advantage over a larger phase shifter. However, for a phase shifter, the use of the above-described rotary operation principle normally results in a larger size of the phase shifter, thus causing an increase in the cost. 
     SUMMARY OF THE INVENTION 
     One object of the present disclosure is to provide a wiper support device capable of overcoming at least one drawback in the prior art. 
     Another object of the present disclosure is to provide a phase shifter comprising the above-described wiper support device. 
     According to an aspect of the present disclosure, there is provided a wiper support device for a phase shifter including a substrate. The wiper support device may comprise a cover, which is provided opposite to the substrate. The wiper support device may further comprise a wiper support, which is located between the cover and the substrate. The wiper support has a first surface facing the cover and a second surface facing the substrate. The second surface may be affixed with a wiper. The wiper support device may further comprise a resilient element, which extends from the first surface of the wiper support toward the cover and abuts against the cover. The wiper support device may further comprise a fastening mechanism, which connects the cover to the substrate. The resilient element may be compressed between the cover and the wiper support. 
     In one embodiment of the wiper support device, the resilient element may extend obliquely towards the cover with respect to the first surface of the wiper support and is movable relative to the cover on a surface of the cover. 
     In one embodiment of the wiper support device, the resilient element may be a resilient finger extending from the first surface of the wiper support toward the cover, one end of which resilient finger is fixed to the first surface of the wiper support, and the other end of which resilient finger is a free end abutting against the cover and movable on a surface of the cover relative to the cover. 
     In one embodiment of the wiper support device, the wiper support may be provided with a cutout, within which the resilient element is located when viewed along a direction perpendicular to the first surface such that the resilient element, when compressed, is deformable towards the cutout so as to enter into the cutout. The advantage of such configuration lies in that the space required for the deformation of the resilient element can be saved, so that the wiper support device is more compact. 
     In one embodiment of the wiper support device, the free end may have a flat contact surface which is remained in contact with the surface of the cover facing the wiper support, so as to form a face contact between the resilient element and the cover. 
     In one embodiment of the wiper support device, the free end may have a projection which remains in contact with the surface of the cover facing the wiper support, so as to form a point contact between the resilient element and the cover. 
     In one embodiment of the wiper support device, the wiper support may be provided with a guide pin, and the cover may be provided with a guide slot, the guide pin passing through the guide slot and being movable within the guide slot. 
     In one embodiment of the wiper support device, the end of the guide slot may serve as a stop to limit a movement of the guide pin. 
     In one embodiment of the wiper support device, the guide pin may be centrally disposed on the wiper support. 
     In one embodiment of the wiper support device, the cover may be connected to the substrate via the fastening mechanism such that a distance between the cover and the substrate is associated with a degree at which the resilient element is compressed. 
     In one embodiment of the wiper support device, the fastening mechanism may comprise an adjusting means, which is configured to adjust a distance between the cover and the substrate. 
     In one embodiment of the wiper support device, a PCB may be fixed on the substrate, and the wiper may abut against the PCB, wherein the wiper is completely covered by the second surface of the wiper support. In the case that the second surface of the wiper support completely covers the wiper, the pressing force on the wiper support produced due to the compression of the resilient element can be uniformly applied to the entire wiper so that the pressure between the wiper and the PCB is uniform. 
     In one embodiment of the wiper support device, the cover, the wiper support and the substrate may be arranged parallel to each other and remain arranged in parallel during operation of the phase shifter. In this case, the distance between the cover and the substrate always maintains uniform so that the pressure between the wiper and the PCB is uniform. 
     In one embodiment of the wiper support device, the wiper support device may comprise a plurality of resilient elements, which are arranged in a regular manner on the wiper support. Such resilient elements may have the same configuration, and/or may be arranged symmetrically around a center of the guide pin. In this case, it can help to maintain a uniform pressure between the wiper and the PCB. 
     In one embodiment of the wiper support device, the wiper support may be provided with a positioning member, and the cover may be provided with a positioning slot. When the wiper support device is assembled, the positioning member may extend into the positioning slot. 
     According to another aspect of the present disclosure, there is provided a phase shifter, which comprises a driving mechanism and the wiper support device as described above, wherein the driving mechanism may be configured to drive the wiper support. 
     In one embodiment of the phase shifter, the driving mechanism may include a pull rod and a pull rod connector fixedly connected to the pull rod, the pull rod connector being configured to drive the wiper support. 
     In an embodiment of the phase shifter, the driving mechanism may include a pull rod and a pull rod support, in which the pull rod support is fixed on the substrate, and the pull rod is slidably coupled to the pull rod support. 
     In one embodiment of the phase shifter, the phase shifter may be provided with a plurality of wiper support devices that share a cover. 
     According to the wiper support device of the present disclosure as well as the phase shifter comprising the wiper support device, the size of the phase shifter may be greatly reduced by using such a configuration that the wiper slides on the PCB, so as to lower cost. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       After reading the embodiments below in combination with the accompany drawings, a plurality of aspects of the present disclosure will be better understood. In the accompany drawings: 
         FIG. 1  is a perspective view of the phase shifter according to the present disclosure; 
         FIG. 2  is a partial perspective view of the phase shifter according to the present disclosure; 
         FIG. 3  is a cross-sectional view of the wiper support device according to the present disclosure; 
         FIG. 4  is an exploded perspective view of the wiper support device according to the present disclosure; 
         FIG. 5  is a perspective view of one embodiment of a wiper support of the wiper support device according to the present disclosure; and 
         FIG. 6  is a perspective view of another embodiment of a wiper support of the wiper support device according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present disclosure will be described as follows with reference to the accompanying drawings, in which certain embodiments of the present disclosure are shown. However, it is to be understood that the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments that are pictured and described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It will also be appreciated that the embodiments disclosed herein can be combined in any way to provide many additional embodiments. 
     Like numbers refer to like elements throughout. In the figures, the thickness of certain lines, layers, components, elements or features may be exaggerated for clarity. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well-known functions or constructions may not be described in detail for brevity and/or clarity. 
     As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. As used herein, phrases such as “between X and Y” and “between about X and Y” should be interpreted to include X and Y. As used herein, phrases such as “between about X and Y” mean “between about X and about Y” As used herein, phrases such as “from about X to Y” mean “from about X to about Y.” 
     It will be understood that when an element is referred to as being “on”, “attached” to, “connected” to, “coupled” with, “contacting”, etc., another element, it can be directly on, attached to, connected to, coupled with or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being, for example, “directly on”, “directly attached” to, “directly connected” to, “directly coupled” with or “directly contacting” another element, there are no intervening elements present. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed “adjacent” another feature may have portions that overlap or underlie the adjacent feature. 
     Spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper”, “lateral”, “left”, “right” and the like, may be used herein for ease of description to describe one element or feature&#39;s relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the descriptors of relative spatial relationships used herein interpreted accordingly. 
     Referring now to the drawings,  FIG. 1  shows one example of the phase shifter  1 . As shown in the drawings, the phase shifter  1  comprises a substrate  10 , a primary phase shifter  20 , a secondary phase shifter  30 , and a driving mechanism  40 . In the following description, a direction along a width of the phase shifter is referred to as a transverse direction, a direction along a length of the phase shifter is referred to as a longitudinal direction, and a direction along a height of the phase shifter is referred to as a vertical direction. 
     The substrate  10  is a substantially plate-shaped member, and the PCB  50  is fixed on the substrate  10 . The primary phase shifter  20  and the secondary phase shifter  30  are arranged above the PCB  50 . The primary phase shifter  20  and the secondary phase shifter  30  may be arranged in a conventional manner. For example, as shown in  FIG. 1 , the primary phase shifter  20  and the secondary phase shifter  30  are arranged side by side. 
     The primary phase shifter  20  and the secondary phase shifter  30  each include a wiper  60  (see  FIG. 2 ), which is configured to abut the PCB  50 , and is movable with respect to the PCB  50  to thereby effect a phase change. 
     The driving mechanism  40  is operatively coupled with the primary phase shifter  20  and the secondary phase shifter  30 , so as to drive operation of the primary phase shifter  20  and the secondary phase shifter  30 . The primary phase shifter  20  and the secondary phase shifter  30  each have a wiper support device on which the wipers  60  are respectively supported. The driving mechanism  40  drives the wiper support device, thus driving movement of the wiper  60  relative to the PCB  50 . 
     In an embodiment, the driving mechanism  40  includes a pull rod  41  and a pull rod support  42 , in which the pull rod support  42  is fixed on the substrate  10 , and the pull rod  41  is slidably coupled to the pull rod support  42 . As shown in  FIGS. 1 and 2 , the pull rod  41  is arranged along a longitudinal direction and movable along the longitudinal direction. 
     The driving mechanism  40  further includes a pull rod connector  43  fixedly connected to the pull rod  41 . As shown in  FIG. 1 , the pull rod connector  43  is substantially transverse to the pull rod  41 , and the movement of the pull rod  41  causes movement of the pull rod connector  43 . The pull rod connector  43  is operatively coupled with the primary phase shifter  20  and the secondary phase shifter  30 , and more specifically, operatively coupled with the wiper support device. Accordingly, the movement of the driving mechanism  40  causes movement of the wiper support device, which in turn causes movement of the wiper  60  relative to the PCB  50 . 
     The primary phase shifter  20  and the secondary phase shifter  30  may use the same or different configurations. In the illustrated embodiments, the primary phase shifter  20  and the secondary phase shifter  30  use different structures. However, this is not restrictive, but merely exemplary. As shown in  FIGS. 1 and 2 , the secondary phase shifter  30  ( FIG. 1 ) uses a sliding configuration which comprises the wiper support device  70  ( FIG. 2 ) according to the present disclosure. The wiper support device  70  ( FIG. 2 ) which supports the wiper  60  ( FIG. 2 ), is operatively coupled with the driving mechanism  40  ( FIG. 1 ) to cause the wiper  60  ( FIG. 2 ) to slide relative to the PCB  50  ( FIG. 2 ). The wiper support device  70  ( FIG. 2 ) according to the present disclosure will be described in detail below. 
     Referring now to  FIGS. 3 and 4 ,  FIG. 3  shows one example of the wiper support device  70  ( FIG. 2 ). As shown in the drawings, the wiper support device  70  serves to support the wiper  60  in the phase shifter such that the wiper  60  is slidable with respect to the PCB, thereby changing a phase. The wiper support device  70  includes a cover  100  ( FIG. 3 ), a wiper support  200  ( FIG. 3 ), a resilient element  300 , and a fastening mechanism  400 . 
     As shown in  FIG. 3 , the cover  100  is a substantially plate-shaped member and disposed opposite to the substrate  10 . The cover  100  is connected to the substrate  10  through the fastening mechanism  400  such that the cover  100  is positioned parallel to the substrate  10  but spaced apart from each other, thereby forming certain distance between the cover  100  and the substrate  10 . 
     In one embodiment, the fastening mechanism  400  may include a fastener  401 . As shown in  FIG. 4 , the fastening mechanism  400  includes four fasteners  401 , which are respectively located at four corners of the cover  100 . At the four corners of the cover  100 , there are provided through holes  101  for the fasteners  401 , through which the fasteners  401  pass correspondingly. 
     At corresponding positions on the substrate  10 , there are also provided with perforations, through which the fasteners  401  pass correspondingly. In this way, the fastener  401  passes through the through hole  101  of the cover  100  and the perforation of the substrate  10  so as to connect the cover  100  to the substrate  10 . 
     The wiper support  200  is located between the cover  100  and the substrate  10 , as shown in  FIG. 3 . In one embodiment, the wiper support  200  is also a generally plate-shaped member having a first surface  201  facing the cover  100  and a second surface  202  facing the substrate  10 . The wiper  60  is fixed to the second surface  202  of the wiper support  200 . A person skilled in the art should understand that, the wiper  60  may be fixed to the second surface  202  by any suitable means, for example, the wiper  60  may be directly adhered to the second surface  202 . 
     As described above, the driving mechanism  40  is operatively coupled with the wiper support device  70 . Accordingly, the movement of the driving mechanism  40  causes movement of the wiper support device  70 , which in turn causes movement of the wiper  60  relative to the PCB  50 . 
     To this end, a coupling mechanism is provided on the wiper support device  70 . Specifically, according to one embodiment, the coupling mechanism is in the form of a guide pin  210  ( FIGS. 3, 5 and 6 ). As shown in  FIGS. 3-6 , the guide pin  210  is substantially centrally disposed on the wiper support  200 . In one embodiment, the guide pin  210  is fixed to the wiper support  200 . In another embodiment, the guide pin  210  is integrally formed with the wiper support  200 . 
     As shown in  FIGS. 5 and 6 , the guide pin  210  which is disposed on the first surface  201  of the wiper support  200 , extends from the first surface  201  toward the cover  100  ( FIG. 3 ). The cover  100  ( FIG. 3 ) is provided with a guide slot  102  ( FIG. 4 ), through which the guide pin  210  passes such as to protrude from the guide slot  102  ( FIG. 4 ). The guide slot  102  ( FIG. 4 ) may use various types of shapes and sizes. The guide slot  102  ( FIG. 4 ), which extends along a longitudinal direction, is shaped and sized to match a movement range of the guide pin  210 , so that the guide pin  210  is movable within the guide slot  102  ( FIG. 4 ). In addition, the guide slot  102  ( FIG. 4 ) may be configured to define a movement range of the guide pin  210 . For example, both ends of the guide slot  102  ( FIG. 4 ) may serve as a stop to limit further movement of the guide pin  210 . 
     The portion of the guide pin  210  protruding from the guide slot  102  is operatively coupled with the driving mechanism  40 , and specifically, operatively coupled with the pull rod connector  43 . As a result, the pull rod  41  of the driving mechanism  40  moves along a longitudinal direction, causing the pull rod connector  43  to move along a longitudinal direction and driving the guide pin  210  to move along a longitudinal direction within the guiding slot  102 , so as to allow that the wiper support  200  moves along a longitudinal direction, and in turn to allow that the wiper  60  fixed on the second surface  202  of the wiper support  200  in the case of abutting against the PCB  50  moves relative to the PCB  50  along a longitudinal direction. 
     The resilient element  300  which is located between the cover  100  and the wiper support  200 , extends from the first surface  201  of the wiper support  200  toward the cover  100  and eventually abuts the cover  100 . 
     As shown in  FIG. 3 , the resilient element  300  extends obliquely toward the cover  100  relative to the first surface  201  of the wiper support  200 . The distal end of the resilient element  300  abuts the cover  100 , and is movable on a surface of the cover  100  facing the wiper support  200 . 
     In one embodiment, the resilient element  300  may be in the form of, for example, a resilient finger, extending from the first surface  201  of the wiper support  200  toward the cover  100 . One end of the resilient finger is a fixed end  301 , which is fixed to the first surface  201  of the wiper support  200 , or which is formed integrally with the wiper support  200 . The other end of the resilient finger is a free end  302 , which abuts the cover  100  and is movable with respect to the cover  100  on a surface of the cover  100  facing the wiper support  200 . 
       FIG. 5  shows one embodiment of the wiper support  200  and the resilient element  300 , and  FIG. 6  shows another embodiment of the wiper support  200  and the resilient element  300 . In the embodiments shown in  FIGS. 5 and 6 , the fixed end  301  of the resilient member  300  is formed integrally with the wiper support  200 . The wiper support  200  is formed with a cutout  230 , at one end of which the fixed end  301  of the resilient element  300  is located. Viewed along a direction perpendicular to the first surface  201 , the resilient element  300  is located within the cutout  230 , so that the resilient element  300  when compressed may be deformed towards the cutout  230  so as to enter the cutout  230 . The advantage presented by such configuration lies in that it is possible to further save a space required for accommodating the resilient element  300  to perform resilient deformation, such that the structure of the wiper support device  70  is more compact. 
     In addition,  FIGS. 5 and 6  respectively show different extension manners of the resilient element  300 . In  FIG. 5 , the resilient element  300  extends from the first surface  201  of the wiper support  200  toward the cover  100  and away from the guide pin  210 , whereas in  FIG. 6 , the resilient element  300  extends from the first surface  201  of the wiper support  200  towards the cover  100  and toward the guide pin  210 . A person skilled in the art may understand that, the resilient element  300  may also use any other suitable extension manner. 
     The free end  302  of the resilient element  300  may present multiple forms, for example the forms as shown in  FIGS. 5 and 6 . In one embodiment, the free end  302  has a flat contact surface, which always remains in contact with the surface of the cover  100  facing the wiper support  200 . In the case that there is a flat contact surface, a face contact is formed between the resilient element  300  and the cover  100 . In another embodiment, the free end  302  has a projection  303  ( FIG. 3 ), which always remains in contact with a surface of the cover  100  facing the wiper support  200 . In the case that there is a projection  303  (see  FIG. 3 ), point contact is formed between the resilient member  300  and the cover  100 . A person skilled in the art should understand that, the free end  302  of the resilient element  300  may also use any other suitable form. 
     As described above, the resilient element  300 , which is disposed between the cover  100  and the wiper support  200 , extends from the wiper support  200  to abut the cover  100 . According to the embodiment of the present disclosure, the resilient element  300  is configured to be compressed between the cover  100  and the wiper support  200 , and always remain compressed during the entire operation of the phase shifter  1 . 
     Since the resilient element  300  is compressed between the cover  100  and the wiper support  200 , the resilient element  300  applies a pressing force to the wiper support  200  so as to bias the wiper support  200  toward the substrate  10 . As described above, the wiper  60  is fixed on the second surface  202  of the wiper support  200 , the PCB  50  is fixed on the substrate  10 , and the wiper  60  abuts against the PCB  50 . Thus, the resilient element  300  applies pressure to the wiper support  200  so that, in turn, pressure is exerted between the wiper  60  and the PCB  50 . 
     Since the resilient element  300  extends between the cover  100  and the wiper support  200 , a distance between the cover  100  and the wiper support  200  determines a degree at which the resilient element  300  is compressed. In this case, since the wiper  60  is fixed on the second surface  202  of the wiper support  200 , the PCB  50  is fixed on the substrate  10 , and the wiper  60  abuts against the PCB  50 , a distance between the cover  100  and the wiper support  200  actually determines a distance between the cover  100  and the substrate  10 . That is, when the cover  100  is fixed to the substrate  10  by the fastening mechanism  400 , the distance between the cover  100  and the substrate  10  is associated with a degree at which the resilient element  300  is compressed. 
     In operation of the phase shifter  1 , the wiper  60  is required to press against the PCB  50  with a suitable pressure, so as to maintain a favorable contact between the wiper  60  and the PCB  50  during movement of the wiper  60  relative to the PCB  50 . In the meantime, the pressure between the wiper  60  and the PCB  50  cannot be too high. Otherwise, there may be an excessive friction force between the wiper  60  and the PCB  50 , which results in difficulty for the wiper  60  to move relative to the PCB  50 . 
     Therefore, it is desirable that the pressure between the wiper  60  and the PCB  50  is adjustable so as to provide a proper pressure according to actual needs. It can be known from the above descriptions that, the degree at which the resilient element  300  is compressed is associated with the pressure between the wiper  60  and the PCB  50 , and moreover, the distance between the cover  100  and the substrate  10  is associated with the degree at which the resilient element  300  is compressed. Thus, the pressure between the wiper  60  and the PCB  50  may be adjusted by adjusting the distance between the cover  100  and the substrate  10 . 
     According to one embodiment of the present disclosure, the distance between the cover  100  and the substrate  10  may be adjusted by selecting a fastening mechanism  400  of a different size. That is, the distance between the cover  100  and the substrate  10  is determined on the basis of the pressure required between the wiper  60  and the PCB  50 , and a suitable fastening mechanism  400  is selected according to the distance between the cover  100  and the substrate  10 . 
     According to another embodiment of the present disclosure, the fastening mechanism  400  may be provided with an adjusting means  410  ( FIG. 4 ), which is configured to adjust a distance between the cover  100  and the substrate  10 . The adjusting means  410  may use any suitable configuration, for example, an adjusting screw, an indexing adjusting means, and the like may be used. 
     In operation of the phase shifter  1 , the pressure between the wiper  60  and the PCB  50  is desirably uniform, thereby improving the operation accuracy of the phase shifter  1 . 
     As described above, the wiper  60  is fixed on the second surface  202  of the wiper support  200 , the PCB  50  is fixed on the substrate  10 , and the wiper  60  abuts against the PCB  50 . According to one embodiment of the present disclosure, the second surface  202  of the wiper supporter  200  is configured such that its surface area is greater than the surface area of the wiper  60  so that the wiper  60  can be completely covered by the second surface  202  when the wiper  60  is completely fixed to the second surface  202 . In this case, the pressing force on the wiper support  200  produced due to the compression of the resilient element  300  can be uniformly applied to the entire wiper  60  so that the pressure between the wiper  60  and the PCB  50  is uniform. 
     According to one embodiment of the present disclosure, the cover  100 , the wiper support  200  and the substrate  10  are arranged parallel to one another, and always remain arranged in parallel during an operation process of the phase shifter  1 . 
     The cover  100  and the substrate  10  are both made of a rigid material. By the connection of the fastening mechanism  400 , the distance between the cover  100  and the substrate  10  always remains uniform so that the cover  100  and the substrate  10  remain arranged in parallel. 
     As described above, the guide pin  210  is disposed substantially centrally on the wiper support  200 . In order to maintain a uniform pressing force produced by the resilient element  300  on the entire wiper support  200 , there may be provided with a plurality of resilient elements  300 , which may be resilient elements of the same configuration. As shown in  FIGS. 5 and 6 , a plurality of resilient elements  300  are arranged on the wiper support  200  in a regular manner, preferably arranged symmetrically with respect to the guide pins  210 . For example, as shown in  FIG. 5 , according to one embodiment of the wiper support device  70 , there are provided with two resilient elements  300 , which are arranged on both sides of the guide pin  210  and symmetrically arranged with respect to the center of the guide pin  210 . For example, as shown in  FIG. 6 , according to one embodiment of the wiper support device  70 , there are provided with four resilient elements  300 , which are symmetrically arranged around the center of the guide pin  210 . A person skilled in the art may understand that, the amount and arrangement manner of the resilient elements  300  are not limited thereto, and various other suitable amounts and arrangement manners are also possible according to actual needs in application. 
     In the case that the cover  100 , the wiper support  200  and the substrate  10  are arranged parallel to one another, with the aid of the symmetrical arrangement of the plurality of resilient elements  300 , the pressing force produced by compression of the resilient elements  300  on the wiper support  200  can be uniformly exerted on the entire wiper  60 , in turn causing a uniform pressure between the wiper  60  and the PCB  50 , during an operation process of the phase shifter. 
     The phase shifter  1  may have a plurality of primary phase shifters  20  and/or secondary phase shifters  30 . In this case, it may be necessary to ensure that the pressure between all the wipers  60  and the PCB  50  is uniform. To this end, the cover  100  may be configured for a plurality of wiper support devices  70 , preferably for all the wiper support devices  70 . For example, as shown in  FIGS. 1 and 2 , one cover  100  is provided. In other words, a plurality of wiper support devices  70  share one cover  100 , thus ensuring that in all the wiper support devices  70 , the distance between the cover  100  and the substrate  10  is uniform and the same, maintaining that the cover  100  and the substrate  10  are arranged in parallel. 
     In this case, the resilient element  300  in each of the wiper support devices  70  may use the same configuration, so that during operation of the phase shifter, the pressure produced by compression of the resilient elements  300  on the wiper support  200  can be uniformly exerted on the entire wiper  60 , in turn causing a uniform pressure between all the wipers  60  and the PCB  50 . 
     Those of skill in this art will appreciate that the resilient element may take other forms. For example, when in the form of a resilient finger as described above, the resilient member may be disposed at a different oblique angle relative to the wiper support  200 , which may influence the pressure experience by the wiper. The resilient finger may be tapered in width or depth along its length to produce a desired force when deflected. The locations and/or angular dispositions of the resilient fingers may vary from that shown herein. Moreover, the resilient member may take a sinuous or serpentine form, with multiple bends and angles (much like a spring), and provide pressure due to compression thereof rather than bending. The resilient members may also comprise multiple layers to impact the pressure force (for example, a damping material may be included as the contact surface to assist with uniformity of pressure). Other variations may also be employed. 
     In one embodiment of the wiper support device  70  according to the present disclosure, the wiper support  200  may be provided with a positioning member  220 , and correspondingly, the cover  100  may be provided with a positioning slot  103 . As shown in  FIGS. 2 and 4 , the positioning member  220  may be disposed on an edge of the wiper support  200 , protruding from the first surface  201  of the wiper support  200  toward the cover  100 . When the wiper support device  70  is assembled, the positioning member  220  extends into the positioning slot  103  to facilitate the positioning of the wiper support  200  relative to the cover  100 . 
     The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof. Although exemplary embodiments of this invention have been described, those skilled in the art should readily appreciate that many variations and modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such variations and modifications are intended to be included within the scope of this invention as defined in the claims. The invention is defined by the following claims, with equivalents of the claims to be included therein.