Patent Publication Number: US-2022223538-A1

Title: Electronic device including printed circuit board having shielding structure

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of International Application No. PCT/KR2021/019538, filed on Dec. 21, 2021, which claims priority to Korean Patent Application No. 10-2021-0003965, filed on Jan. 12, 2021 in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference. 
    
    
     TECHNICAL FIELD 
     One or more embodiments of the instant disclosure generally relate to an electronic device including a substrate having a shielding structure. 
     BACKGROUND ART 
     Electronic devices have been made slimmer due to user preference and market pressure, and have been developed to have increased rigidity to better protect internal components. 
     An electronic device may include at least two substrates (for example, printed circuit boards (PCBs)) disposed in the inner space thereof. Theses substrates may be stacked on each other so as to provide an efficient mounting space for other components, and may be electrically connected to each other via a stack-type substrate (for example, interposer) disposed therebetween. For example, substrates may include multiple conductive terminals, and the two substrates may be electrically connected by physical contact via multiple corresponding conductive terminals disposed on corresponding surfaces of the stack-type substrate. 
     Multiple electronic components need to be mounted on the substrate of the electronic device, and the spaces in which the components are mounted must be used efficiently in order to provide the slimmest possible electronic device. In addition, if multiple electronic components efficiently disposed on the substrate of the electronic device interfere with each other and thus fail to function correctly, the quality of the electronic device may be degraded. Therefore, recent developments have been directed to satisfy such conditions. 
     Surface mount device (SMD) process for a substrate mounted on an electronic device may be done at high temperatures, and two substrates may bend during this process. If the two substrates bend to different extents, or if the two substrates bent in different directions, the two substrates and the stack-type substrate (for example, interpose) may detach from each other. Such detachment may be a cause of defect that opens the connection between multiple conductive terminals. 
     SUMMARY 
     An electronic device according to an embodiment of the disclosure may include a housing, a first substrate disposed in an inner space of the housing and having one or more first electric elements disposed thereon, a second substrate disposed in the inner space to be parallel with the first substrate and having one or more second electric elements disposed thereon, and a third substrate disposed between the first substrate and the second substrate and configured to electrically connect the first substrate and the second substrate, the second substrate being disposed from the first substrate in a first direction, wherein the second substrate includes a first metal layer including a first metal pattern connected to ground and multiple first slits formed by removing a portion of the first metal pattern, each of the multiple first slits having a cross shape, a second metal layer formed from the first metal layer in a second direction opposite to the first direction and including a second metal pattern connected to the ground and multiple second slits formed by removing a portion of the second metal pattern, each of the multiple second slits having the cross shape, and multiple ground vias extending through at least a portion of the second substrate so as to connect the first metal pattern of the first metal layer to the second metal pattern of the second metal layer. 
     An electronic device according to an embodiment of the disclosure may include a housing, a first substrate disposed in an inner space of the housing and having one or more first electric elements disposed thereon, a second substrate disposed in the inner space to be parallel with the first substrate and having one or more second electric elements disposed thereon, and a third substrate disposed between the first substrate and the second substrate and configured to electrically connect the first substrate and the second substrate, the second substrate being disposed from the first substrate in a first direction, wherein the second substrate includes a first metal layer including a first metal pattern connected to ground and multiple first slits formed by removing a portion of the first metal pattern, each of the multiple first slits having a first shape, a second metal layer formed from the first metal layer in a second direction opposite to the first direction and including a second metal pattern connected to the ground and multiple second slits formed by removing a portion of the second metal pattern, each of the multiple second slits having a second shape other than the first shape, and multiple ground vias extending through at least a portion of the second substrate so as to connect the first metal pattern of the first metal layer to the second metal pattern of the second metal layer, and wherein, when the second substrate is viewed from the first direction, portions of the first metal layer excluding the multiple first slits are arranged to overlap the second metal pattern of the second metal layer, and portions of the second metal layer excluding the multiple second slits are arranged to overlap the first metal pattern of the first metal layer. 
     An electronic device according to an embodiment of the disclosure may have a slit formed in a second substrate (for example, sub-substrate or slave substrate), thereby adjusting the remained copper ratio of the second substrate (i.e. a ratio proportional to the amount of copper remaining in the second substrate), and may prevent two substrates (for example, first and second substrates) and a stack-type substrate (for example, interposer) from detaching from each other. 
     An electronic device according to an embodiment of the disclosure may provide a second substrate having a shielding structure configured such that multiple ground vias can be disposed near the slit. 
     Various other advantageous effects identified explicitly or implicitly through the disclosure may be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front perspective view of a mobile electronic device according to an embodiment disclosed herein; 
         FIG. 2  is a rear perspective view of the electronic device in  FIG. 1  according to an embodiment disclosed herein; 
         FIG. 3  is an exploded perspective view of the electronic device in  FIG. 1  according to an embodiment disclosed herein; 
         FIG. 4  is an exploded perspective view of an electronic device in which a stackable substrate is applied between two substrates according to an embodiment disclosed herein; 
         FIG. 5  is a planar view of a third substrate according to an embodiment; 
         FIG. 6  is a cross-sectional view illustrating a lateral surface of an electronic device in a state in which a pair of substrates is arranged according to an embodiment; 
         FIG. 7  is a view illustrating a stacking structure of a second substrate according to an embodiment; 
         FIG. 8  is a planar view illustrating a first metal layer of a second substrate according to an embodiment; 
         FIG. 9  is a planar view illustrating a second metal layer of a second substrate according to an embodiment; 
         FIG. 10  is a perspective view illustrating an arrangement state of a first metal layer and a second metal layer according to an embodiment; 
         FIG. 11  is a planar view illustrating an arrangement state of a first metal layer and a second metal layer according to an embodiment; 
         FIG. 12  is a planar view illustrating a portion of a conventional second metal layer; 
         FIG. 13  is a planar view illustrating a portion of a second metal layer according to an embodiment; 
         FIG. 14  is a planar view illustrating a second metal layer of a second substrate according to another embodiment; 
         FIG. 15  is a planar view illustrating an arrangement state of a first metal layer and a second metal layer according to another embodiment; 
         FIG. 16A  is a planar view illustrating another embodiment in which two neighboring second slits are connected to each other; 
         FIG. 16B  is a planar view illustrating a second slit having a bar shape (for example, a quadrangular shape) extending in x direction according to another embodiment; 
         FIG. 16C  is a planar view illustrating a second slit having a protrusion  1801  protruding in the +x direction according to another embodiment; 
         FIG. 16D  is a planar view illustrating a second slit having a protrusion  1901  protruding in the −x direction according to another embodiment; 
         FIG. 16E  is a planar view illustrating a second slit having a protrusion  2001  protruding in the +y direction according to another embodiment; 
         FIG. 16F  is a planar view illustrating a second slit having a protrusion  2101  protruding in the −y direction according to another embodiment; 
         FIG. 16G  is a planar view illustrating a second slit having a protrusion  2201  protruding in the +x direction according to another embodiment; 
         FIG. 16H  is a planar view illustrating a second slit having a protrusion  2301  protruding in the −x direction according to another embodiment; 
         FIG. 16I  is a planar view illustrating a second slit having a protrusion  2401  protruding in the +x direction according to another embodiment; and 
         FIG. 16J  is a planar view illustrating a second slit having a protrusion  2501  protruding in the −x direction according to another embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Certain embodiments of the disclosure may provide an electronic device configured to prevent two substrates and a stack-type substrate (for example, interposer) from detaching from each other. 
     Certain embodiments of the disclosure may provide an electronic device including a substrate having a shielding structure configured such that multiple ground vias can be disposed near a slit. 
     Technical problems to be solved by the disclosure are not limited to the above-mentioned technical problems, and other technical problems not mentioned herein will be clearly understood from the following description by those skilled in the art to which the disclosure pertains. 
       FIG. 1  is a front perspective view of a mobile electronic device  100  according to an embodiment disclosed herein.  FIG. 2  is a rear perspective view of the electronic device  100  in  FIG. 1  according to an embodiment disclosed herein. 
     Referring to  FIG. 1  and  FIG. 2 , the electronic device  100  according to an embodiment may include a housing  110  including a first surface (or a front surface)  110 A, a second surface (or a rear surface)  110 B, and a lateral surface  110 C surrounding a space between the first surface  110 A and the second surface  110 B. According to another embodiment (not shown), the housing may refer to a structure for configuring a portion of the first surface  110 A, the second surface  110 B, and the lateral surface  110 C in  FIG. 1 . According to an embodiment, at least a portion of the first surface  110 A may be made of a substantially transparent front plate  102  (for example, a glass plate including various coating layers or a polymer plate). The second surface  110 B may be made of a substantially opaque rear plate  111 . The rear plate  111  may be formed by, for example, coated or colored glass, ceramic, polymers, metals (for example, aluminum, stainless steel (STS), or magnesium), or a combination of at least two thereof. The lateral surface  110 C may be coupled to the front plate  102  and the rear plate  111  and formed by a lateral bezel structure  118  (or a “lateral member”) including a metal and/or a polymer. In an embodiment, the rear plate  111  and the lateral bezel structure  118  may be integrally formed and be made of the same material (for example, metal material such as aluminum). 
     In the embodiment illustrated above, the front plate  102  may include first area  110 D seamlessly extending from the first surface  110 A to be bent toward the rear plate at the opposite ends of a long edge of the front plate. In the embodiment illustrated above (see  FIG. 2 ), the rear plate  111  may include second area  110 E seamlessly extending from the second surface  110 B to be bent toward the front plate at the opposite ends of the long edge. In an embodiment, the front plate  102  or the rear plate  111  may include only one of the first areas  110 D or the second areas  110 E. In an embodiment, the front plate  102  may not include the first area and the second area, but include a flat surface disposed in parallel with the second surface  110 B. In the embodiments above, when viewed from the lateral side of the electronic device, the lateral bezel structure  118  may have a first thickness (or a width) at the lateral surface in which the first area  110 D or the second area  110 E is not included, and may have a second thickness thinner than the first thickness at the lateral surface in which the first area or the second area is included. 
     According to an embodiment, the electronic device  100  may include at least one of a display  101 , an input device  103 , an audio output device  107  and  114 , a sensor module  104  and  119 , a camera module  105 ,  112 , and  113 , a key input device  117 , an indicator (not shown), and a connector  108  and  109 . In an embodiment, the electronic device  100  may omit one of components (for example, the key input device  117  or the indicator) or may additionally include another component. 
     The display  101  may be exposed through, for example, a substantial portion of the front plate  102 . In an embodiment, at least a part of the display  101  may be exposed through the front plate  102  configuring the first surface  110 A and the first area  110 D of the lateral surface  110 C. The display  101  may be combined to or disposed adjacent to a touch sensing circuit, a pressure sensor for measuring a strength (pressure) of a touch, and/or a digitizer for detecting a magnetic field-type stylus pen. In an embodiment, at least a part of the sensor module  104  and  119  and/or at least a part of the key input device  117  may be disposed on the first area  110 D and/or the second area  110 E. 
     The input device  103  may include a microphone  103 . In an embodiment, the input device  103  may include multiple microphone  103  arranged so as to detect a direction of sound. The audio output device  107  and  114  may include speakers  107  and  114 . The speakers  107  and  114  may include an outer speaker  107  and a receiver hole  114  for calling. In an embodiment, the microphone  103 , the speakers  107  and  114 , and the connectors  108  and  109  may be arranged in the space of the electronic device  100  and exposed to the outside environment through at least one hole formed through the housing  110 . In an embodiment, a hole formed in the housing  110  may be used in common for the microphone  103  and the speakers  107  and  114 . In an embodiment, the audio output device  107  and  114  may include a speaker (for example, a piezo speaker) operating without a hole formed in the housing  110 . 
     The sensor module  104  and  119  may generate an electrical signal or a data value corresponding to an internal operation state or external environment state of the electronic device  100 . The sensor module  104  and  119  may include a first sensor module  104  (for example, a proximity sensor) disposed on the first surface  110 A of the housing  110  and/or a second sensor module (not shown) (for example, a fingerprint sensor), and/or a third sensor module  119  (for example, an HRM sensor) disposed on the second surface  110 B of the housing  110 . The fingerprint sensor may be disposed on the first surface  110 A (for example, a home key button  115 ), on a partial area of the second surface  110 B, or under the display  101  of the housing  110 . The electronic device  100  may further include at least one sensor module not shown in the drawings, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, humidity sensor, or an illuminance sensor  104 . 
     The camera module  105 ,  112 , and  113  may include the first camera device  105  disposed on the first surface  110 A of the electronic device  100  and the second camera device  112  disposed on the second surface  110 B, and/or a flash  113 . The camera modules  105  and  112  may include one or more of lenses, an image sensor, and/or an image signal processor. The flash  113  may include, for example, a light-emitting diode or a xenon lamp. In an embodiment, two or more lenses (a wide-angle lens, a super-wide-angle lens, or a telephoto lens) and image sensors may be arranged on one surface of the electronic device  100 . 
     The key input device  117  may be disposed on the lateral surface  110 C of the housing  110 . In another embodiment, the electronic device  100  may not include a portion or entirety of the key input device  117  described above, and the excluded key input device  117  may be implemented as various forms such as a soft key on the display  101 . In another embodiment, the key input device  117  may be implemented by using a pressure sensor included in the display  101 . 
     The indicator may be disposed, for example, on the first surface  110 A of the housing  110 . The indicator may provide state information of the electronic device  100  in a form of light, for example. In another embodiment, the light-emitting element may provide, for example, a light source associated with an operation of the camera module  105 . The indicator may include, for example, a light emitting diode (LED), an infrared LED (IR LED), and a xenon lamp. 
     The connector hole  108  and  109  may include a first connector hole  108  capable of receiving a connector (for example, a USB connector) for transmitting or receiving power and/or data to or from an external electronic device, and/or a second connector hole (or an earphone jack)  109  capable of receiving a connector for transmitting or receiving an audio signal to or from an external electronic device. 
     A certain camera module  105  of the camera modules  105  and  112 , a certain sensor module  104  of the sensor modules  104  and  119 , or the indicator may be disposed to be exposed through the display  101 . By way of example, the camera module  105 , the sensor module  104 , or the indicator may be disposed in the inner space of the electronic device  100  to be in contact with the external environment through a through-hole extending through the front plate  102  of the display  101 . For another example, a certain sensor module  104  may be disposed in the inner space of the electronic device to perform functions thereof without visually exposing through the front plate  102 . For example, in this case, a through-hole of the display  101 , facing the sensor module may be unnecessary. 
       FIG. 3  is an exploded perspective view of the electronic device  100  in  FIG. 1  according to an embodiment disclosed herein. 
     The electronic device  300  In  FIG. 3  may be at least partially similar to the electronic device  100  in  FIG. 1  and  FIG. 2  or may implement another embodiment of an electronic device. 
     Referring to  FIG. 3 , the electronic device  300  (for example, the electronic device  100  in  FIG. 1  or  FIG. 2 ) may include a lateral member  310  (for example, a lateral bezel structure), a first support member  311  (for example, a bracket or a support structure), a front plate  320  (for example, a front cover), a display  330 , a substrate  340 , a battery  350 , a second support member  360  (for example, a rear case), an antenna  370 , and a rear plate  380  (for example, a rear cover). In an embodiment, the electronic device  300  may omit at least one of the components (for example, the first support member  311  or the second support member  360 ) or additionally include another component. At least one of the components of the electronic device  300  may be the same as or similar to at least one of the components of the electronic device  100  in  FIG. 1  or  FIG. 2 , and thus the overlapping description thereof will be omitted. 
     The first support member  311  may be disposed in the electronic device  300  to be connected to the lateral structure  310  or integrally formed with the lateral structure  310 . The first support member  311  may be made of, for example, metal material and/or non-metal (for example, polymer) material. The first support member  311  may have the display  330  coupled to one surface thereof and the substrate  340  coupled to the other surface thereof. A processor, a memory, and/or an interface may be mounted to the substrate  340 . The processor may include, for example, one or more of a central processing device, an application processor, a graphic process device, an image signal processor, a sensor hub processor, or a communication processor. 
     The memory may include, for example, a transitory memory or a non-transitory memory. 
     The interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a SD card interface, and/or an audio interface. The interface, for example, may electrically or physically connect the electronic device  300  to an external electronic device, and may include a USB connector, SD card/MMC connector, or an audio connector. 
     The battery  350  is a device for supplying power to at least one component of the electronic device  300 , and may include, for example, a non-rechargeable primary battery, or a rechargeable secondary battery, or a fuel cell. At least a part of the battery  350  may be disposed, for example, on a substantially identical plane to the substrate  340 . The battery  350  may be integrally disposed inside the electronic device  300 . In another example, the battery  350  may be disposed to be attachable to/detachable from the electronic device  300 . 
     The antenna  370  may be interposed between the rear plate  380  and the battery  350 . The antenna  370  may include, for example, a near field communication (NFC) antenna, a wireless charge antenna, and/or a magnetic secure transmission (MST) antenna. The antenna  370 , for example, may perform near field communication with an external device or wirelessly transmit and receive power required for charging. In another embodiment, an antenna structure may be formed by a part or a combination of the lateral bezel structure  310  and/or the first support member  311 . 
       FIG. 4  is an exploded perspective view of an electronic device  400  in which a stackable substrate  440  is applied between two substrates  420  and  430  according to an embodiment disclosed herein. 
     The electronic device  400  In  FIG. 4  may be at least partially similar to the electronic device  100  in  FIG. 1  and  FIG. 2  or the electronic device  300  in  FIG. 3  or may implement other embodiments of an electronic device. 
     Referring  FIG. 4 , the electronic device  400  (for example, the electronic device  300  in  FIG. 3 ) may include a housing (for example, the housing  110  in  FIG. 1 ) including a front cover  481  (for example, the front plate  320  in  FIG. 3 ), a rear cover  480  (for example, the rear plate  380  in  FIG. 3 ) facing a direction opposite to the front cover  481 , and a lateral frame  410  (for example, the lateral member  310  in  FIG. 3 ) surrounding a space between the front cover  481  and the rear cover  480 . According to an embodiment, the electronic device  400  may include a first support member  411  (for example, the first support member  311  in  FIG. 3 ) disposed in an inner space thereof. According to an embodiment, the first support member  411  may be integrated with the lateral frame  410  to extend into the inner space from the lateral frame  410 . In another embodiment, the first support member  411  may be separately provided in the inner space of the electronic device  400 . According to an embodiment, the first support member  411  may extend from the lateral frame  410  and have at least a partial area made of a conductive material. According to an embodiment, the electronic device  400  may further include a camera structure  490  disposed in a space between the front cover  481  and the rear cover  480 . 
     According to an embodiment, the electronic device  400  may include a pair of substrates  420  and  430  (for example, printed circuit boards (PCBs)) disposed between the first support member  411  and the rear cover  480  in the inner space. According to an embodiment, when viewing the rear cover  480  from above as shown in  FIG. 4 , the pair of substrates  420  and  430  may disposed such that at least portions thereof overlap with each other. According to an embodiment, the pair of substrates  420  and  430  may include a first substrate  420  (for example, the main substrate) disposed between the first support member  411  and the rear cover  480  and a second substrate  430  (for example, the sub-substrate) disposed between the first substrate  420  and the rear cover  480 . 
     According to an embodiment, the electronic device  400  may include a third substrate  440  (for example, an interposer or a stackable substrate) interposed between the first substrate  420  and the second substrate  430 . According to an embodiment, the third substrate  440  may include multiple conductive terminals and come into physical contact with conductive terminals arranged on the two substrates  420  and  430  so as to electrically connect the two substrates  420  and  430 . For example, the third substrate  440  may be preferentially mounted on the first substrate  420  using a pre-solder applied on the conductive terminals. In another example, the third substrate  440  may be preferentially mounted on the second substrate  430  using a pre-solder applied on the conductive terminals. According to an embodiment, the electronic device  400  may include a second support member  470  disposed between the second substrate  430  and the rear cover  480 . According to an embodiment, the second support member  470  may be disposed at a position at least partially overlapping the second substrate  430 . According to an embodiment, the second support member  470  may include a metal plate. Accordingly, the first substrate  420 , the third substrate  440 , and the second substrate  430  may be fixed to the first support member  411  through the second support member  470  disposed thereon. For example, the second support member  470  may be fastened to the first support member  411  using a fastening member such as a screw so as to firmly support the electric connection among the first substrate  420 , the third substrate  440 , and the second substrate  430 . In another embodiment, the first substrate  420 , the third substrate  440 , and the second substrate  430  may be disposed in the inner space of the electronic device  400  without the second support member  470 . 
     An electronic device (for example, the electronic device  100  in  FIG. 1 ) according to an embodiment of the disclosure may include a housing (for example, the housing  110  in  FIG. 1 ), a first substrate (for example, the first substrate  420  in  FIG. 6 ) disposed in the inner space of the housing  110  and having one or more first electric elements (for example, the first electric element  611  in  FIG. 6 ) disposed thereon, a second substrate (for example, the second substrate  430  in  FIG. 6 ) disposed in the inner space to be parallel with the first substrate  420  and having one or more second electric elements (for example, the second electric element  612  in  FIG. 6 ) disposed thereon, and a third substrate (for example, the third substrate  440  in  FIG. 6 ) disposed between the first substrate  420  and the second substrate  430  and electrically connecting the first substrate  420  and the second substrate  430 . The second substrate  430  may be disposed from the first substrate  420  in a first direction (for example, the first direction (−z direction) in  FIG. 6 ). The second substrate  430  may include a first metal layer (for example, the first metal layer  710  in  FIG. 8 ) which includes a first metal pattern (for example, the first metal pattern  711  in  FIG. 8 ) connected to ground and multiple first slits (for example, the first slit  712  in  FIG. 8 ) formed by removing a portion of the first metal pattern  711 , each first slit  712  having a cross shape, a second metal layer (for example, the second metal layer  720  in  FIG. 9 ) which is formed from the first metal layer  710  in a second direction (for example, the second direction (z direction) in  FIG. 7 ) opposite to the first direction (−z direction) and includes a second metal pattern (for example, the second metal pattern  721  in  FIG. 9 ) connected to the ground and multiple second slits (for example, the second slit  722  in  FIG. 9 ) formed by removing a portion of the second metal pattern  721 , each second slit  722  having the cross shape, and multiple ground vias (for example, the ground via  731  in  FIG. 8 ) extending through at least a portion of the second substrate  430  so as to connect the first metal pattern  711  of the first metal layer  710  to the second metal pattern  721  of the second metal layer  720 . 
     According to an embodiment, the multiple first slits  712  may be arranged in a matrix form at intervals and the multiple second slits  722  may be arranged in a matrix form at intervals. 
     According to an embodiment, each of the multiple first slits  712  and each of the multiple second slit  722  may have the same area. 
     According to an embodiment, each of the multiple first slits  712  may include a first portion disposed at the center of the first slit  712 , a second portion disposed from the first portion in +y direction, a third portion disposed from the first portion in −y direction, a fourth portion disposed from the first portion in +x direction, and a fifth portion disposed from the first portion in −x direction, and each of the first portion to the fifth portion may have a square shape of a first width. Each of the second slits  722  may include a sixth portion disposed at the center of the second slit  722 , a seventh portion disposed from the sixth portion in +y direction, an eighth portion disposed from the sixth portion in −y direction, a ninth portion disposed from the sixth portion in +x direction, and a tenth portion disposed from the sixth portion in −x direction, and each of the sixth to the tenth portion may have the square shape of the first width. 
     According to an embodiment, when viewing the second substrate  430  from the first direction (−z direction), the center of one first slit  712  and the center of one second slit  722  may be disposed to be spaced apart by a distance corresponding twice the first width. 
     According to an embodiment, when viewing the second substrate  430  from the first direction (−z direction), the fourth portion of the first slit  712  and the tenth portion of the second slit  722  may disposed to overlap each other and the fifth portion of the first slit  712  and the ninth portion of the second slit  722  may be disposed to overlap each other. 
     According to an embodiment, when viewing the second substrate  430  from the first direction (−z direction), the portions of the first slit  712  other than the fourth portion and the fifth portion may be disposed to overlap the second metal pattern  721  of the second metal layer  720 , and the portions of the second slit  722  other than the ninth portion and the tenth portion may be disposed to overlap the first metal pattern  711  of the first metal layer  710 . 
     According to an embodiment, the multiple first slits  712  arranged in odd-numbered rows and the multiple first slits  712  arranged in even-numbered rows may not be arranged in a straight line in y direction but be arranged to be shifted from each other. 
     According to an embodiment, the multiple second slits  722  arranged in odd-numbered rows and the multiple second slits  722  arranged in even-numbered rows may not be arranged in a straight line in y direction but be arranged to be shifted from each other. 
     According to an embodiment, the multiple ground vias  731  may be arranged at both sides of each first slit  712  at intervals therebetween and connect the first metal pattern  711  to the second metal pattern  721 . 
     An electronic device  100  according to an embodiment of the disclosure may include a housing  110 , a first substrate  420  disposed in the inner space of the housing  110  and having one or more first electric elements  611  disposed thereon, a second substrate  430  disposed in the inner space to be parallel with the first substrate  420  and having one or more second electric elements  612  disposed thereon, and a third substrate  440  disposed between the first substrate  420  and the second substrate  430  and electrically connecting the first substrate  420  and the second substrate  430 . The second substrate  430  may be disposed from the first substrate  420  in a first direction (−z direction), and the second substrate  430  may include a first metal layer  710  which includes a first metal pattern  711  connected to ground and multiple first slits  712  formed by removing a portion of the first metal pattern  711 , each first slit  712  having a first shape, a second metal layer  720  which is formed from the first metal layer  710  in a second direction (z direction) opposite to the first direction (−z direction) and includes a second metal pattern  721  connected to the ground and multiple second slits  722  formed by removing a portion of the second metal pattern  721 , each second slit  722  having a second shape different from the first shape, and multiple ground vias  731  extending through at least a portion of the second substrate  430  so as to connect the first metal pattern  711  of the first metal layer  710  to the second metal pattern  721  of the second metal layer  720 . When viewing the second substrate  430  from the first direction (−z direction), the portions of the first metal layer  710  excluding the multiple first slits  712  may be disposed to overlap the second metal pattern  721  of the second metal layer  720 , and the portions of the second metal layer  720  excluding the multiple second slits  722  may be disposed to overlap the first metal pattern  711  of the first metal layer  710 . 
     According to an embodiment, the first shape may include a cross shape, and the second shape may include a bar shape. 
     According to an embodiment, two neighboring first slits  712  may have the cross shape and may be connected to each other. 
     According to an embodiment, the first shape and the second shape may include one shape selected from among a cross shape, a bar shape extending in x direction, a bar shape extending in x direction and having a protrusion protruding from the center of the bar in y direction, a bar shape extending in x direction and having a protrusion protruding from the center of the bar in −y direction, a bar shape extending in x direction and having a protrusion protruding from one end of the bar in y direction, a bar shape extending in x direction and having a protrusion protruding from one end of the bar in −y direction, a bar shape extending in x direction and having a protrusion protruding from another end of the bar in y direction, a bar shape extending in x direction and having a protrusion protruding from another end of the bar in −y direction, a bar shape extending in y direction, a bar shape extending in y direction and having a protrusion protruding from the center of the bar in x direction, a bar shape extending in y direction and having a protrusion protruding from the center of the bar in −x direction, a bar shape extending in y direction and having a protrusion protruding from one end of the bar in x direction, a bar shape extending in y direction and having a protrusion protruding from one end of the bar in −x direction, a bar shape extending in y direction and having a protrusion protruding from another end of the bar in x direction, and a bar shape extending in y direction and having a protrusion protruding from another end of the bar in −x direction. 
     According to an embodiment, the multiple first slits  712  may be arranged in a matrix form at intervals and the multiple second slits  722  may be arranged in a matrix form at intervals. 
     According to an embodiment, when viewing the second substrate  430  from the first direction (−z direction), the center of one first slit  712  and the center of one second slit  722  may be disposed to be spaced a pre-configured distance apart from each other. 
     According to an embodiment, the multiple first slits  712  arranged in odd-numbered rows and the multiple first slits  712  arranged in even-numbered rows may not be arranged in a straight line in y direction but be arranged to be shifted from each other. 
     According to an embodiment, the multiple second slits  722  arranged in odd-numbered rows and the multiple second slits  722  arranged in even-numbered rows may not be arranged in a straight line in y direction but be arranged to be shifted from each other. 
     According to an embodiment, the multiple ground vias  731  may be arranged at both sides of each first slit  712  at intervals therebetween and connect the first metal pattern  711  to the second metal pattern  721 . 
     According to an embodiment, the second metal layer  720  may be the outermost layer disposed closest to the first substrate  420  in the stacking structure of the second substrate  430 . 
       FIG. 5  is a planar view of a third substrate  440  according to an embodiment.  FIG. 6  is a cross-sectional view illustrating a lateral surface of an electronic device in a state in which a pair of substrates is arranged according to an embodiment. 
     Referring to  FIG. 5  and  FIG. 6 , an electronic device  400  (for example, the electronic device  400  in  FIG. 4 ) may include a first substrate  420 , a second substrate  430  spaced apart from the first substrate  420  in an overlapping manner, and a third substrate  440  disposed between the first substrate  420  and the second substrate  430 . According to an embodiment, the third substrate  440  may include an opening  4404 . According to an embodiment, the opening  4404  may be in a closed loop shape or an opened loop shape which is at least partially opened. According to an embodiment, the first substrate  420  may be a main substrate disposed in the inner space of the electronic device (for example, the electronic device  400  in  FIG. 4 ) and may have a larger area than the second substrate  430 . According to an embodiment, the third substrate  440  may be formed substantially along an edge of the second substrate  430  and formed to have a designated size so as to surround the opening  4404 . In an embodiment, the first substrate  420 , the second substrate  430 , and/or the third substrate  440  may have the same size or different sizes from each other. 
     According to an embodiment, the electronic device  400  may include three or more substrates (not shown) unlike the embodiment shown in  FIG. 6 , and the three or more substrates may be electrically connected to each other by stackable substrates (not shown) which is identical to the third substrate  440  or of which at least a portion is similar to the third substrate. For example, the electronic device may include a multi-stacking structure having three or more substrates. 
     According to an embodiment, the first substrate  420  may include a first surface  4201  facing the second substrate  430  and a second surface  4202  facing a direction opposite to the first surface  4201 . According to an embodiment, the first substrate  420  may include multiple first conductive terminals  421  exposed on the first surface  4201 . According to an embodiment, the second substrate  430  may include a third surface  4301  facing the first substrate  420  and a fourth surface  4302  facing a direction opposite to the third surface  4301 . According to an embodiment, the second substrate  430  may include multiple second conductive terminals  431  exposed on the third surface  4301 . According to an embodiment, the third substrate  440  may include a first substrate surface  4401  facing the first substrate  420  and a second substrate surface  4402  opposite the first substrate surface  4401  and facing the second substrate  430 . According to an embodiment, the third substrate  440  may include multiple third conductive terminals  442  disposed on the first substrate surface  4401  to face the multiple first conductive terminals  421  disposed on the first surface  4201  of the first substrate  420 . According to an embodiment, the third substrate  440  may include multiple fourth conductive terminals  443  disposed on the second substrate surface  4402  to respectively face the multiple second conductive terminals  431  disposed on the third surface  4301  of the second substrate  430 . According to an embodiment, each of the multiple third conductive terminals  442  and the multiple fourth conductive terminals  443  may be electrically connected through a conductive via  444  (for example, a conductive post) disposed to penetrate from the first substrate surface  4401  to the second substrate surface  4402  through a dielectric substrate  441  of the third substrate  440 . 
     According to an embodiment, the first substrate  420  may include at least one first electric element  611  disposed on the first surface  4201  and at least one second electric element  612  disposed on the second surface  4202 . According to an embodiment, the second substrate  430  may include a third electric element  613  disposed on the fourth surface  4302 . According to an embodiment, the first electric element to the third electric element  611 ,  612 , and  613  may be at least one of an application processor (AP), a communication processor (CP), a power management IC (PMIC), a power supply circuit, an RF-related element (for example, an RF transceiver), or an audio module. 
     According to an embodiment, the second substrate  430  may include a shielding structure (for example, the first metal layer  710  and the second metal layer  720  in  FIG. 7 ) configured to shield electrical noise incurred from the first electric element  611  mounted on the first substrate  420 . According to an embodiment, when viewing the second substrate  430  from above (for example, z direction), the area in which the shielding structure is disposed may be located at a position overlapping at least the first electric element  611 . According to an embodiment, when viewing the second substrate  430  from above (for example, z direction), the area in which the shielding structure is disposed may be located at not only the position overlapping the first electric element  611  but also a position not overlapping the first electric element  611 . For example, the shielding structure may be disposed to correspond to the entire area of the second substrate  430 . According to an embodiment, the shielding structure of the second substrate  430  may include a metal layer that includes a metal pattern connected to ground, multiple slits formed by removing at least a portion of the metal pattern from the metal layer, and multiple ground vias arranged around the multiple slits and penetrating at least some layers of the second substrate  430  to connect the metal pattern to the ground. According to an embodiment, when viewing the second substrate  430  from above (for example, z direction), the metal pattern of the second substrate  430  may be disposed at a position overlapping at least the first electric element  611  and electrically connected to a ground structure (for example, a conductive bracket) inside the electronic device to perform the shielding function. For example, electrical noise incurred from the first electric element  611  may be shielded by the metal pattern formed on at least a portion of the second substrate  423  and the multiple ground vias arranged around the multiple slits so as not to be transferred to the third electric element  613  and an inner layer of the second substrate  430  on which the third electric element  613  is disposed. 
     According to an embodiment, the formation of the multiple slits may adjust a remained copper ratio and a warpage attribute of the second substrate  430 . For example, the second substrate  430  may change the warpage attribute by adjusting the remained copper ratio. When the warpage attribute of the second substrate  430  is improved or optimized, it is possible to reduce the possibility of defects, such as an open connection between the first substrate  420  and the third substrate  440  and/or between the second substrate  430  and the third substrate  440 . For example, when a surface mount device process of a substrate included in the electronic device is performed at high temperatures, the pair of substrates  420  and  430  may be warped during this process. When the warpage degrees of each of two substrates  420  and  430  are different or the warpage directions of each of two substrates  420  and  430  are different, lifting between the pair of substrates  420  and  430  and the third substrate  440  (for example, an interposer) may occur. The shift may cause the defect of an open connection between the multiple conductive terminals. In certain embodiments disclosed herein, the multiple slits are formed in the second substrate  430  to adjust the remained copper ratio of the second substrate  430  so as to reduce the defect of an open connection between the first substrate  420  and the third substrate  440  and/or between the second substrate  430  and the third substrate  440 . 
       FIG. 7  is a view illustrating a stacking structure of a second substrate  430  according to an embodiment. 
     Referring to  FIG. 7 , the stacking structure of the second substrate  430  according to an embodiment may include a middle layer L 2 -L 9 , an upper layer L 1  disposed in a first direction (−z) from the middle layer L 2 -L 9 , and a lower layer L 10  disposed in a second direction (z) opposite to the first direction (−z) from the middle layer L 2 -L 9 . According to an embodiment, the first direction (−z) may be defined as a direction from the first substrate  420  to the second substrate  430 . For example, the first direction (−z) may be −z direction shown in  FIG. 6 . According to an embodiment, the second direction (z) may be defined as a direction from the second substrate  430  to the first substrate  420 . For example, the second direction (z) may be z direction shown in  FIG. 6 . 
     According to an embodiment, the middle layer L 2 -L 9  may collectively form an inner layer of the second substrate  430  and may be implemented as a multilayer in which multiple insulative layers, multiple copper foil layers, and multiple copper plating layers are stacked. For example, the middle layer L 2 -L 9  may include a stacking structure in which multiple flexible copper clad laminate (CCL) are stacked. According to an embodiment, the middle layer L 2 -L 9  may include multiple flexible copper clad laminate and at least one layer of the multiple flexible copper clad laminate may be used as the first metal layer  710  connected to ground. For example, the middle layer L 2 -L 9  may include a first metal layer  710  connected to ground. According to an embodiment, the first metal layer  710  may include a first metal pattern  711  connected to ground and multiple first slits  712  formed by removing at least a portion of the first metal pattern  711 . 
     According to an embodiment, the upper layer L 1  may be an outer layer disposed in the first direction (−z) of the second substrate  430  and may be a multilayer in which an insulative layer, a copper foil layer, and a copper plating layer are stacked. According to an embodiment, the upper layer L 1  may further include a protective layer formed on the outermost layer facing a first direction (−z). According to an embodiment, the protective layer of the upper layer L 1  may form a fourth surface (for example, the fourth surface  4302  in  FIG. 6 ) of the second substrate  430  and have a third electric element  613  disposed thereon. According to an embodiment, the protective layer may include a coverlay, a solder resistor, or a photo solder resist (PSR) ink. 
     According to an embodiment, the lower layer L 10  may be an outer layer disposed in the second direction (z) of the second substrate  430  and may be a multilayer in which an insulative layer, a copper foil layer, and a copper plating layer are stacked. According to an embodiment, the lower layer L 10  may further include a protective layer formed on the outermost layer facing a first direction (−z). According to an embodiment, the protective layer of the lower layer L 10  may form a third surface (for example, the third surface  4301  in  FIG. 6 ) of the second substrate  430  and may be disposed to face the first substrate  420 . According to an embodiment, the copper foil layer of the lower layer L 10  may be defined as a second metal layer  720  connected to ground. For example, the lower layer L 10  may include a second metal layer  720  connected to ground. According to an embodiment, the second metal layer  720  may include a second metal pattern  721  connected to ground and multiple second slits  722  formed by removing at least a portion of the second metal pattern  721 . 
     According to an embodiment, the second substrate  430  may include multiple ground vias  731  configured to electrically connect at least one first metal layer  710  formed on the middle layer L 2 -L 9  to the second metal layer  720  formed on the lower layer L 10 . According to an embodiment, the multiple ground vias  731  may penetrate at least a portion of the lower layer L 10  and at least a portion of the middle layer L 2 -L 9  so as to electrically connect at least one first metal layer  710  to the second metal layer  720 . For example, the multiple ground vias  731  may electrically connect the first metal pattern  711  of the first metal layer  710  to the second metal pattern  721  of the second metal layer  720 . The multiple ground vias  731  may connect the ground of the first metal layer  710  to the ground of the second metal layer  720  by electrically connecting the first metal pattern  711  to the second metal pattern  721 . 
       FIG. 8  is a planar view illustrating a first metal layer  710  of a second substrate  430  according to an embodiment. For example,  FIG. 8  may be a planar view illustrating a portion of the first metal layer  710  when viewing the second substrate  430  from above (for example, the first direction (−z)). 
       FIG. 9  is a planar view illustrating a second metal layer  720  of a second substrate  430  according to an embodiment. For example,  FIG. 9  may be a planar view of a portion of the second metal layer  720  when viewing the second substrate  430  from above (for example, the first direction (−z)). 
     The first metal layer  710  shown in  FIG. 8  may be at least partially similar to the first metal layer  710  shown in  FIG. 7  or may implement another embodiment of the instant disclosure. The second metal layer  720  shown in  FIG. 9  may be at least partially similar to the second metal layer  720  shown in  FIG. 7  or may implement another embodiment. Hereinafter, in reference to  FIG. 8  and  FIG. 9  collectively, attributes of the first metal layer  710  and the second metal layer  720  not described in connection with  FIG. 7  or are different from those shown in  FIG. 7  will be described. 
     Referring to  FIG. 8  and  FIG. 9 , the first metal layer  710  and the second metal layer  720  may include slits having shapes identical to each other. According to an embodiment, the first metal layer  710  may include multiple first slits  712  having a first shape and the second metal layer  720  may include multiple second slits  722  having a second shape. According to an embodiment, the first shape of the first slit  712  and the second shape of the second slit  722  may be the same. 
     According to an embodiment, the first slit  712  and the second slit  722  may each have a cross shape. According to an embodiment, the area of each first slit  712  and the area of each second slit  722  may be identical to each other. For example, one side of the first slit  712  may have the first length d 1  and the maximum horizontal width (or maximum vertical width) of the first slit  712  may be three times the first length d 1 . Similarly, one side of the second slit  722  may have the first length d 1  and the maximum horizontal width (or maximum vertical width) of the second slit  722  may be three times the first length d 1 . 
     According to an embodiment, as shown in  FIG. 8 , the multiple first slits  712  may be arranged in a matrix form at certain intervals. By way of example, the first slits  712  may be arranged in rows, and the first slits  712  arranged in the k-th row R_k may be arranged at intervals of the first length d 1 . According to an embodiment, the distance between the centers  811  and  812  of the first slits  712  arranged adjacent to each other in the x direction may have the second length d 2 . For example, the second length d 2  may correspond to four times the first length d 1 . According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), x direction may be a horizontal direction, as shown in  FIG. 8 . 
     According to an embodiment, first slits  712  arranged on odd-numbered rows R_k and R_k+2 may not be arranged not to form a straight line with first slits  712  arranged on the even-numbered row R_k+1. For example, the center  811  of the first slits  712  arranged on the odd-numbered rows R_k and R_k+2 and the center  821  of the first slits  712  arranged on the even-numbered row R_k+1 may be arranged not to form a straight line in y direction but are shifted from each other. According to an embodiment, the center  811  of the first slits  712  arranged on the odd-numbered rows R_k and R_k+2 and the center  821  of the first slits  712  arranged on the even-numbered row R_k+1 may be arranged to be spaced apart by a predetermined third length d 3  in the x direction. According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), y direction may be a vertical direction. For example, the third length d 3  may correspond to two times the first length d 1 . 
     According to an embodiment, as shown in  FIG. 9 , the multiple second slits  722  may be arranged in a matrix form at certain intervals. By way of example, the second slits  722  may be arranged in rows, and the second slits  722  arranged in the q-th row R_q may be arranged at intervals of the first length d 1 . According to an embodiment, the distance between the centers  911  and  912  of the second slits  722  arranged adjacent to each other in the x direction may have the second length d 2 . For example, the second length d 2  may correspond to four times the first length d 1 . According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), x direction may be a horizontal direction. 
     According to an embodiment, second slits  722  arranged on odd-numbered rows R_q and R_q+2 may not be arranged not to form a straight line with second slits  722  arranged on the even-numbered row R_q+1. For example, the center  911  of the second slits  722  arranged on the odd-numbered rows R_q and R_q+2 and the center  921  of the second slits  722  arranged on the even-numbered row R_q+1 may be arranged not to form a straight line in y direction but are shifted from each other. According to an embodiment, the center  911  of the second slits  722  arranged on the odd-numbered rows R_q and R_q+2 and the center  921  of the second slits  722  arranged on the even-numbered row R_q+1 may be arranged to be spaced apart by a predetermined third length d 3  in the x direction. According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), y direction may be a vertical direction. For example, the third length d 3  may correspond to two times the first length d 1 . 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), the first slit  712  and the second slit  722  may be disposed to at least partially overlap each other. According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), the center  811  of the first slit  712  and the center  911  of the second slit  722  may be disposed to be spaced apart by a predetermined length (for example, the third length d 3  in  FIG. 10 ) from each other. Accordingly, the first slit  712  may be divided into a portion overlapping the second slit  722  of the second metal layer  720  and a portion overlapping the second metal pattern  721  of the second metal layer  720 . The second slit  722  may be divided into a portion overlapping the first slit  712  of the first metal layer  710  and a portion overlapping the first metal pattern  711  of the first metal layer  710 . 
     According to an embodiment, multiple ground vias  731  may be arranged around the multiple first slits  712 . According to an embodiment, the multiple ground vias  731  may be arranged at intervals and may electrically connect the first metal pattern  711  of the first metal layer  710  to the second metal pattern  721  of the second metal layer  720 . The multiple ground vias  731  may connect the ground of the first metal layer  710  to the ground of the second metal layer  720  by electrically connecting the first metal pattern  711  to the second metal pattern  721 . According to an embodiment, the multiple ground vias  731  may be arranged at both sides of the first slit  712  at intervals therebetween and connect the first metal pattern  711  to the second metal pattern  721 . 
       FIG. 10  is a perspective view illustrating an arrangement state of a first metal layer  710  and a second metal layer  720  according to an embodiment disclosed herein. For example,  FIG. 10  may be a perspective view of a state in which a portion of the first metal layer  710  and a portion of the second metal layer  720  are disposed to overlap each other.  FIG. 11  is a planar view illustrating an arrangement state of a first metal layer  710  and a second metal layer  720  according to an embodiment. For example,  FIG. 11  may be a planar view of a state in which a portion of the first metal layer  710  and a portion of the second metal layer  720  are disposed to overlap each other. 
     Referring to  FIG. 10  and  FIG. 11 , each of the first slits  712  may have a cross shape made up of square-shaped portions. Each of the second slits  722  may have a cross shape made up of square-shaped portions. 
     According to an embodiment, the first slit  712  may include a first portion A 1  disposed at the center of the first slit  712 , a second portion A 2  disposed from the first portion A 1  in +y direction, a third portion A 3  disposed from the first portion A 1  in −y direction, a fourth portion A 4  disposed from the first portion A 1  in +x direction, and a fifth portion A 5  disposed from the first portion A 1  in −x direction. According to an embodiment, each of the first portion A 1  to the fifth portion A 5  may have a square shape having a first width (for example, the first length d 1  in  FIG. 8 ). 
     According to an embodiment, the second slit  722  may include a sixth portion A 6  disposed at the center of the second slit  722 , a seventh portion A 7  disposed from the sixth portion A 6  in +y direction, an eighth portion A 8  disposed from the sixth portion A 6  in −y direction, a ninth portion A 9  disposed from the sixth portion A 6  in +x direction, and a tenth portion A 10  disposed from the sixth portion A 6  in −x direction. Each of the sixth portion A 6  to the tenth portion A 10  may have a square shape having a first width (for example, the first length d 1  in  FIG. 9 ). 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), the first slit  712  and the second slit  722  may be disposed to at least partially overlap each other. According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), the center of the first slit  712  and the center of the second slit  722  may be disposed to be spaced apart by a predetermined length, for example, the third length d 3  corresponding to two times the first length (or first width) d 1 . Accordingly, the first slit  712  may be divided into a portion overlapping the second slit  722  of the second metal layer  720  and a portion overlapping the second metal pattern  721  of the second metal layer  720 . The second slit  722  may be divided into a portion overlapping the first slit  712  of the first metal layer  710  and a portion overlapping the first metal pattern  711  of the first metal layer  710 . 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), the distance between the center of the first slit  712  and the center of the second slit  722  may depend on the number of vias  731  arranged between the first slit  712  and the second slit  722 . For example, when viewing the second substrate  430  from above (for example, the first direction (−z)), a predetermined number of vias  731  may be arranged between the first slit  712  and the second slit  722 , the distance between the center of the first slit  712  and the center of the second slit  722  may be determined based on the predetermined number or a length corresponding to the predetermined number. For example, as described above, when viewing the second substrate  430  from above (for example, the first direction (−z)), the distance between the center of the first slit  712  and the center of the second slit  722  may be determined based on the distance within which about three vias are arranged at given intervals. 
     According to an embodiment, as shown in  FIG. 11 , when viewing the second substrate  430  from the first direction (−z), the fourth portion A 4  of the first slit  712  and the tenth portion A 10  of the second slit  722  may disposed to overlap each other and the fifth portion A 5  of the first slit  712  and the ninth portion A 9  of the second slit  722  may be disposed to overlap each other. 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1110  in  FIG. 11  may be generated by the first slit  712  and the second slit  722  overlapping each other and may be an area corresponding to the fourth portion A 4  and the fifth portion A 5  of the first slit  712  and the ninth portion A 9  and the tenth portion A 10  of the second slit  722 . 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1120  in  FIG. 11  may be generated by the first slit  712  and the second metal pattern  721  of the second metal layer  720  overlapping each other, and may be an area corresponding to a remaining area of the first slit  712  excluding the fourth portion A 4  and the fifth portion A 5 . 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1130  in  FIG. 11  may be generated by the first metal pattern  711  of the first metal layer  710  and the second slit  722  overlapping each other, and may be an area corresponding to a remaining area of the second slit  722  excluding the ninth portion A 9  and the tenth portion A 10 . 
     According to an embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1140  in  FIG. 11  may be generated by the first metal pattern  711  of the first metal layer  710  and the second metal pattern  721  of the second metal layer  720  overlapping each other, and the multiple ground vias  731  may be arranged at intervals on the corresponding area. 
       FIG. 12  is a planar view illustrating a portion of a conventional second metal layer.  FIG. 13  is a planar view illustrating a portion of a second metal layer  720  according to an embodiment. 
     The second metal layer  720  shown in  FIG. 13  may be at least partially similar to the second metal layer  720  shown in  FIG. 7  and  FIG. 9  or may implement another embodiment. Hereinafter, with reference to  FIG. 13 , attributes of the second metal layer  720  not described in connection with  FIG. 7  or are different from those in  FIG. 7  and  FIG. 9  will be described. Referring to  FIG. 12 , the conventional second metal layer  1200  may include a second metal pattern  1210  connected to ground and multiple second slits  1220  formed by removing at least a portion of the second metal pattern  1210 . In this conventional example, the second slit  1220  may have a shape extending in y direction. In this conventional example, the multiple second slits  1220  may be arranged in the x direction at intervals. In the conventional second substrate, an RF signal wire  1230  may be formed through the middle layer L 2 -L 9  overlapping the second metal layer  1200 . 
     In the conventional second substrate, the second metal pattern  1210  of the second metal layer  1200  may vertically extend to intersect with the RF signal wire  1230  and a magnetic field affecting the RF signal wire  1230  may be formed by a predetermined current flowing through the second metal pattern  1210 . Thus conventionally, when a high frequency signal (or a signal of high current) is provided through the RF signal wire  1230 , the magnetic field formed by the second metal pattern  1210  may cause signal distortion and/or crosstalk due to coupling. 
     Referring to  FIG. 13 , in the electronic device according to an embodiment, the second slit  722  of the second metal layer  720  is formed to have a cross shape (or a grid shape) and the multiple ground vias  731  are arranged at intervals around the second slit  722 , thus reducing the influence of the second metal pattern  721  of the second metal layer  720  over the RF signal wire  1230 . For example, when viewing the second substrate  430  from above (for example, the first direction (−z)), the second substrate  430  may reduce signal distortion and/or crosstalk due to coupling by arranging the multiple ground vias  731  around the RF signal wire  1230 . For example, in the electronic device according to an embodiment, the length of the slit is shorter than that of the conventional example in  FIG. 12  and thus the wavelength of signals passable through the slit may be shortened. For example, the conventional slit  1220  shown in  FIG. 12  may have a fourth length d 4  and the slit according to an embodiment shown in  FIG. 13  may have a fifth length d 5  shorter than the fourth length d 4 . 
     When the wavelength of the signals passable through the slit is shortened, noise incurred from the middle layer L 2 -L 9  to be radiated outside is reduced, and as a result, a robust shielding structure may be provided. 
       FIG. 14  is a planar view illustrating a second metal layer  720  of a second substrate  430  according to another embodiment. For example,  FIG. 14  may be a planar view of a portion of the second metal layer  720  when viewing the second substrate  430  from above (for example, the first direction (−z)). 
       FIG. 15  is a planar view illustrating an arrangement state of a first metal layer  710  and a second metal layer  720  according to another embodiment. For example,  FIG. 15  may be a planar view of a state in which a portion of the first metal layer  710  shown in  FIG. 8  and a portion of the second metal layer  720  shown in  FIG. 14  are disposed to overlap each other. The second metal layer  720  shown in  FIG. 14  and  FIG. 15  may be at least partially similar to the second metal layer  720  shown in  FIG. 7  and  FIG. 9  or may include another embodiment. Hereinafter, in reference to  FIG. 14  and  FIG. 15  collectively, attributes of the second metal layer  720  not described in connection with  FIG. 7  and  FIG. 9  or are different from those shown in  FIG. 7  and  FIG. 9  will be described. 
     Referring to  FIG. 14 , the second substrate  430  according to another embodiment may include multiple first slits  712  formed on the first metal layer  710  and multiple second slits  722  formed on the second metal layer  720 , wherein the shape of the first slit  712  and the shape of the second slit  722  may be different from each other. 
     According to another embodiment, the first metal layer  710  and the second metal layer  720  may include slits having shapes different from each other. According to another embodiment, the first metal layer  710  may include multiple first slits  712  having a first shape and the second metal layer  720  may include multiple second slits  722  having a second shape. According to another embodiment, the first shape of the first slit  712  and the second shape of the second slit  722  may be different from each other. 
     According to another embodiment, the multiple first slits  712  formed on the first metal layer  710  may have a cross shape as that shown in  FIG. 8 . 
     According to another embodiment, the second multiple slits  722  formed on the second metal layer  720  may have a bar shape as that shown in  FIG. 14 . For example, the multiple second slits  722  may have a bar shape (for example, a quadrangular shape) extending in the y direction and arranged in a matrix form. 
     According to another embodiment, as shown in  FIG. 14 , the second slits  722  arranged on odd-numbered rows may not be arranged not to form a straight line with second slits  722  arranged on even-numbered rows. For example, the center of the second slits  722  arranged on the odd-numbered rows and the center of the second slits  722  arranged on the even-numbered rows may be arranged not to form a straight line in the y direction but to be shifted from each other. 
     According to another embodiment, as shown in  FIG. 15 , when viewing the second substrate  430  from above (for example, the first direction (−z)), the first slit  712  may be arranged to completely not overlap the second slit  722 . Accordingly, the first slit  712  may not overlap the second slit  722  of the second metal layer  720  but overlap the second metal pattern  721  of the second metal layer  720 . The second slit  722  may not overlap the first slit  712  of the first metal layer  710  but overlap the first metal pattern  711  of the first metal layer  710 . 
     According to another embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1510   1  in FIG. may be generated by the first slit  712  and the second metal pattern  721  of the second metal layer  720  overlapping each other. 
     According to another embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1520  in  FIG. 15  may be generated by the first metal pattern  711  of the first metal layer  710  and the second slit  722  overlapping each other. 
     According to another embodiment, when viewing the second substrate  430  from above (for example, the first direction (−z)), an area having a hatching pattern  1530  in  FIG. 15  may be generated by the first metal pattern  711  of the first metal layer  710  and the second metal pattern  721  of the second metal layer  720  overlapping each other, and the multiple ground vias  731  may be arranged at intervals on the corresponding area. 
     Referring to  FIG. 15 , when viewing the second substrate  430  from above (for example, the first direction (−z)), in the second substrate  430  according to another embodiment, the first slit  712  and the second metal pattern  721  are arranged to completely overlap each other, and the second slit  722  and the first metal pattern  711  are arranged to 

 
     completely overlap each other, thus providing a robust shielding structure. 
     According to certain embodiments, unlike shown in  FIG. 14  and  FIG. 15 , the shape of the first metal layer  710  and the shape of the second metal layer  720  may be interchanged. For example,  FIG. 14  may show the first metal layer  710  according to another embodiments, which may be disposed to overlap the second metal layer  720  shown in  FIG. 9 . 
       FIG. 16A  to  FIG. 16J  are planar views illustrating a first metal layer  710  or a second metal layer  720  of a second substrate  430  according to still other embodiments. For example,  FIG. 16A  to  FIG. 16J  may be planar views of a portion of the first metal layer  710  or the second metal layer  720  when viewing the second substrate  430  from above (for example, the first direction (−z)). 
     The second metal layer  720  shown in  FIG. 16A  to  FIG. 16J  may be at least partially similar to the first metal layer  710  and/or the second metal layer  720  shown in  FIG. 7  and  FIG. 9  or may include another embodiment. Hereinafter, in reference to  FIG. 16A  to  FIG. 16J , attributes of the second metal layer  720  not described in connection to  FIG. 7  and  FIG. 9  or are different from those shown in  FIG. 7  and  FIG. 9  will be described. 
     Referring to  FIG. 16A , the second metal layer  720  according to another embodiment may include the second metal pattern  721  connected to ground and multiple second slits  722 , and the second metal pattern  721  may be electrically connected to a first metal pattern  711  of the first metal layer  710  through multiple ground vias  731 . According to another embodiment, the multiple second slits  722  are arranged to have a cross shape and two neighboring second slits  722  may be formed to be connected to each other. For example, two second slits  722  neighboring in the x direction may be connected to each other. For example, a ninth portion A 9  (for example, the ninth portion A 9  in  FIG. 10 ) of the second slit  722  may be formed to be continuously connected to a tenth portion A 10  (for example, the tenth portion A 10  in  FIG. 10 ) of the second slit  722 , adjacent thereto in the x direction. According to certain embodiments, the first metal layer  710  may be formed in a shape identical or similar to a shape of the second metal layer  720  shown in  FIG. 16A . For example, a fourth portion A 4  (for example, the fourth portion A 4  in  FIG. 10 ) of the first slit  712  may be formed to be continuously connected to a fifth portion A 5  (for example, the fifth portion A 5  in  FIG. 10 ) of the first slit  712 , adjacent thereto in the x direction. In the second substrate  430  according to another embodiment shown in  FIG. 16A , two neighboring first slits  712  (or two neighboring second slits  722 ) are formed to be connected to each other so that the remained copper ratio and the warpage attribute are easily adjusted and the defect of open connection between the first substrate  420  and the third substrate  440  and/or between the second substrate  430  and the third substrate  440  may be reduced. 
     Referring to  FIG. 16B , the multiple second slits  722  may be disposed to have a bar shape (for example, a quadrangular shape) extending in the x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16B . For example, although not shown, each of the multiple first slits  712  may be disposed to have a bar shape extending in the x direction. 
     Referring to  FIG. 16C , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  1801  protruding from the center of the bar in the +x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16C . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding in the +x direction. 
     Referring to  FIG. 16D , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  1901  protruding from the center of the bar in the −x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16D . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding from the center of the bar in the −x direction. 
     Referring to  FIG. 16E , each of the multiple second slits  722  may be disposed to have a bar shape extending in the x direction and a protrusion  2001  protruding from the center of the bar in the +y direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16E . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the x direction and a protrusion (not shown) protruding from the center of the bar in the +y direction. 
     Referring to  FIG. 16F , each of the multiple second slits  722  may be disposed to have a bar shape extending in the x direction and a protrusion  2101  protruding from the center of the bar in the −y direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16F . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the x direction and a protrusion (not shown) protruding from the center of the bar in the −y direction. 
     Referring to  FIG. 16G , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  2201  protruding from one end of the bar in the +x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16G . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding from one end of the bar in the +x direction. 
     Referring to  FIG. 16H , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  2301  protruding from one end of the bar in the −x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16H . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding from one end of the bar in the −x direction. 
     Referring to  FIG. 16I , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  2401  protruding from the other end of the bar in the +x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16I . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding from the other end of the bar in the +x direction. 
     Referring to  FIG. 16J , each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion  2501  protruding from the other end of the bar in the −x direction. According to an embodiment, the first metal layer  710  may be formed in a shape identical or similar to the shape of the second metal layer  720  shown in  FIG. 16J . For example, although not shown, each of the multiple second slits  722  may be disposed to have a bar shape extending in the y direction and a protrusion (not shown) protruding from the other end of the bar in the −x direction. 
     According to certain embodiments, the first shape of the first slit  712  and the second shape of the second slit  722  may be changed and combined into various shapes not shown in the disclosure. For example, the first shape and the second shape may have one shape selected from among the following shapes.
         A cross shape;   A bar shape extending in the x direction;   A bar shape extending in the x direction and having a protrusion protruding from the center of the bar in the y direction;   A bar shape extending in the x direction and having a protrusion protruding from the center of the bar in the −y direction;   A bar shape extending in the x direction and having a protrusion protruding from one end of the bar in the y direction;   A bar shape extending in the x direction and having a protrusion protruding from one end of the bar in the −y direction;   A bar shape extending in the x direction and having a protrusion protruding from the other end of the bar in they direction;   A bar shape extending in the x direction and having a protrusion protruding from the other end of the bar in the −y direction;   A bar shape extending in the y direction;   A bar shape extending in the y direction and having a protrusion protruding from the center of the bar in the x direction;   A bar shape extending in the y direction and having a protrusion protruding from the center of the bar in the −x direction;   A bar shape extending in the y direction and having a protrusion protruding from one end of the bar in the x direction;   A bar shape extending in the y direction and having a protrusion protruding from one end of the bar in the −x direction;   A bar shape extending in the y direction and having a protrusion protruding from the other end of the bar in the x direction;   A bar shape extending in the y direction and having a protrusion protruding from the other end of the bar in the −x direction.       

     The electronic device according to certain embodiments may adjust the remained copper ratio of a second substrate and prevent shifting between a stackable substrate (for example, an interposer) and two substrates (for example, first substrate and second substrate) by forming slits on the second substrate (for example, a sub-substrate or a slave substrate). 
     The electronic device according to certain embodiments may provide a second substrate having a shielding structure in which multiple ground vias are arranged around slits. 
     In addition, various effects directly or indirectly identified through the disclosure may be provided. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present disclosure as defined by the appended claims and their equivalents.