Patent Publication Number: US-2022231653-A1

Title: Circuit device and filter circuit

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to Japanese Patent Application No. 2019-225302 filed on Dec. 13, 2019 and is a Continuation Application of PCT Application No. PCT/JP2020/041687 filed on Nov. 9, 2020. The entire contents of each application are hereby incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present disclosure relates to a circuit device and a filter circuit. 
     2. Description of the Related Art 
     In an electronic device, noise suppression is generally performed using a filter circuit. Examples of the filter circuit used for the noise suppression include an EMI (Electro-Magnetic Interference) suppression filter. The EMI suppression filter allows a necessary component of a current flowing through a conductor to pass through and removes an unnecessary component thereof. Further, it is known that since the filter circuit uses a capacitor as a capacitance element, a noise suppression effect is lowered by equivalent series inductance (ESL) that is a parasitic inductance of the capacitor. 
     A technique is known in which the equivalent series inductance (ESL) of a capacitor is canceled with negative inductance generated by magnetically coupling two coils and a frequency range of a noise suppression effect of a filter circuit is widened (Japanese Unexamined Patent Application Publication No. 2001-160728, for example). 
     In order to cancel the equivalent series inductance (ESL) of the capacitor, it is necessary to adjust mutual inductance M of the two coils. In an LC filter disclosed in Japanese Unexamined Patent Application Publication No. 2001-160728, since two coils are provided in a magnetic body, a large mutual inductance M may be obtained. However, in order to adjust the mutual inductance M to match the equivalent series inductance (ESL) to be canceled, it is necessary to change the magnetic coupling of the two coils or the like, and thus it is difficult to adjust the mutual inductance M. 
     SUMMARY OF THE INVENTION 
     Preferred embodiments of the present disclosure provide circuit devices and filter circuits that are each able to adjust mutual inductance of two coils. 
     A circuit device according to a preferred embodiment of the present invention includes a substrate, a wiring pattern on the substrate, and a coil component on the substrate. The coil component includes a first coil and a second coil in a multilayer body such that coil surfaces thereof face each other in a lamination direction, and the coil component is mounted such that the coil surfaces thereof are parallel or substantially parallel to a surface of the substrate. The wiring pattern includes a first electrode portion connected to an input terminal of the coil component and provided along a first side surface of the multilayer body on which the input terminal is provided, a second electrode portion connected to an output terminal of the coil component and provided along a second side surface of the multilayer body, the second side surface being opposed to the first side surface, a first wiring portion electrically connected to the first electrode portion at a position shifted along the first side surface from a center of the first side surface by a first distance, and a second wiring portion electrically connected to the second electrode portion at a position shifted along the second side surface from a center of the second side surface by a second distance. 
     A circuit device according to a preferred embodiment of the present invention includes a substrate, a wiring pattern on the substrate, and a coil component on the substrate. The coil component includes a first coil and a second coil in a multilayer body such that coil surfaces thereof face each other in a lamination direction, and the coil component is mounted such that the coil surfaces thereof are parallel or substantially parallel to a surface of the substrate. The wiring pattern includes a first electrode portion connected to an input terminal of the coil component and provided along a first side surface of the multilayer body on which the input terminal is provided, a second electrode portion connected to an output terminal of the coil component and provided along a second side surface of the multilayer body, the second side surface being opposed to the first side surface, a first wiring portion not electrically connected to the first electrode portion, and a second wiring portion not electrically connected to the second electrode portion. The first electrode portion includes a first connection portion at a position shifted in a first direction along the first side surface from a center of the first side surface by a first distance, and a second connection portion at a position shifted in a second direction opposite to the first direction along the first side surface from the center of the first side surface by the first distance. The second electrode portion includes a third connection portion at a position shifted in the first direction along the second side surface from a center of the second side surface by a second distance, and a fourth connection portion at a position shifted in the second direction along the second side surface from the center of the second side surface by the second distance. The first wiring portion includes a first end portion extending to a position facing the first connection portion, and a second end portion extending to a position facing the second connection portion. The second wiring portion includes a third end portion extending to a position facing the third connection portion, and a fourth end portion extending to a position facing the fourth connection portion. The circuit device includes a first connection element that electrically connects between the first connection portion and the first end portion, or between the second connection portion and the second end portion, and a second connection element that electrically connects between the third connection portion and the third end portion, or between the fourth connection portion and the fourth end portion. 
     A filter circuit according to a preferred embodiment of the present invention includes a circuit device according to a preferred embodiment of the present invention and a capacitor connected to an electrode between the first coil and the second coil of the coil component. 
     According to each of the preferred embodiments of the present invention, mutual inductance of the coil component is able to be adjusted by making a current flow along the side surface of the multilayer body through the wiring pattern. 
     The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view of a circuit device according to Preferred Embodiment 1 of the present invention. 
         FIG. 2  is a perspective view of a coil component according to Preferred Embodiment 1 of the present invention. 
         FIG. 3  is a graph illustrating a relationship between mutual inductance of the circuit device according to Preferred Embodiment 1 of the present invention and a shifting value of a wiring portion. 
         FIGS. 4A and 4B  are plan views of another pattern of the circuit device according to Preferred Embodiment 1 of the present invention. 
         FIGS. 5A and 5B  are plan views of another pattern of the circuit device according to Preferred Embodiment 1 of the present invention. 
         FIG. 6  is a circuit diagram of a filter circuit including the coil component according to Preferred Embodiment 1 of the present invention. 
         FIGS. 7A and 7B  are plan views of a circuit device according to Preferred Embodiment 2 of the present invention. 
         FIGS. 8A and 8B  are plan views of another pattern of the circuit device according to Preferred Embodiment 2 of the present invention. 
         FIGS. 9A and 9B  are plan views of a circuit device according to Preferred Embodiment 3 of the present invention. 
         FIGS. 10A and 10B  are plan views of another pattern of the circuit device according to Preferred Embodiment 3 of the present invention. 
         FIGS. 11A and 11B  are plan views of the circuit device according to Preferred Embodiment 3 of the present invention and a comparative example. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, circuit devices and filter circuits according to preferred embodiments will be described with reference to the drawings. 
     Preferred Embodiment 1 
     First, a circuit device  10 A according to Preferred Embodiment 1 of the present invention will be described with reference to the drawings.  FIG. 1  is a plan view of the circuit device  10 A according to Preferred Embodiment 1. A coil component  1  is mounted on a surface of a substrate  2  of the circuit device  10 A. Land electrodes  60 ,  70 ,  80 , and  81  on which the coil component  1  is surface-mounted are provided on the surface of the substrate  2 . The land electrode  60  is connected to an electrode  4   a  that is an output terminal to output a current from the coil component  1 , and the land electrode  70  is connected to an electrode  4   b  that is an input terminal to input the current to the coil component  1 . The direction of the current flowing through the coil component  1  may be changed such that the current is inputted through the electrode  4   a  as the input terminal and is outputted through the electrode  4   b  as the output terminal. 
     The land electrode  80  is connected to an electrode  4   c  of the coil component  1 , and the land electrode  81  is connected to an electrode  4   d  of the coil component  1 . The electrode  4   c  described later is between a coil L 1  and a coil L 2  included in the coil component  1  and is connected to the coil L 1  and the coil L 2 . The electrode  4   d  is not connected to the coil L 1  or the coil L 2 . 
     A wiring line  61  is connected to the land electrode  60  as illustrated in  FIG. 1 . The wiring line  61  is connected to the land electrode  60  at a position shifted in a minus direction from the center of the side surface (first side surface on which the electrode  4   a  is provided) of the coil component  1  by a shifting value X (first distance). A dashed-and-dotted line in  FIG. 1  represents the center of the side surface of the coil component  1  and the wiring line, and a lower side in the drawing is defined as the minus (negative) direction and an upper side in the drawing is defined as a plus (positive) direction. 
     A wiring line  71  is connected to the land electrode  70  as illustrated in  FIG. 1 . The wiring line  71  is connected to the land electrode  70  at a position shifted in the minus direction from the center of the side surface (second side surface on which the electrode  4   b  is provided) of the coil component  1  by a shifting value Y (second distance). In the circuit device  10 A, the shifting value X (first distance) and the shifting value Y (second distance) are the same or substantially the same, and the shifts of the wiring line  61  and the wiring line  71  may be represented only by the shifting value X (first distance). 
     The substrate  2  is formed by laminating multiple insulation layers and is made of, for example, low-temperature co-fired ceramics, glass epoxy resin, or the like. Each of the land electrodes  60 ,  70 ,  80 , and  81 , and the wiring lines  61  and  71  provided on the surface of the substrate  2  is a wiring pattern and is made of, for example, a metal such as Cu, Ag, or Al used as an electrode in many cases. 
     The coil component  1  is a transformer coil and includes the coil L 1  (first coil) and the coil L 2  (second coil) provided in a multilayer body such that the coil surfaces thereof face each other in the lamination direction. Further, the coil component  1  is mounted such that the coil surfaces thereof are parallel or substantially parallel to the surface of the substrate  2 . The configuration of the coil component  1  will be described with reference to the drawings.  FIG. 2  is a perspective view of the coil component according to Preferred Embodiment 1. Here, in  FIG. 2 , a short side direction of the coil component  1  is defined as an X direction, a longitudinal direction is defined as a Y direction, and a height direction is defined as a Z direction. Further, the lamination direction of the substrates is the Z direction, and the direction of the arrow indicates the upper layer direction. 
     As illustrated in  FIG. 2 , the coil component  1  is configured of a multilayer body  3  (ceramic element body) made of ceramic layers in which multiple substrates (ceramic green sheets) are laminated. A wiring line of the coil is provided on the substrate. The multilayer body  3  includes a pair of main surfaces opposed to each other and side surfaces connecting the main surfaces. In parallel or substantially in parallel to the main surface of the multilayer body  3 , multiple first wiring patterns  10 , multiple third wiring patterns  30 , and multiple second wiring patterns  20  are laminated in this order from the bottom to form the coil L 1  and the coil L 2 . 
     The side surfaces of the multilayer body  3  include a first side surface and a second side surface on the long sides and a third side surface and a fourth side surface on the short sides. The first side surface is the side surface on which the electrode  4   a  (first electrode) is provided, the second side surface is the side surface on which the electrode  4   b  (second electrode) is provided, the third side surface is the side surface on which the electrode  4   c  (third electrode) is provided, and the fourth side surface is the side surface on which the electrode  4   d  is provided. 
     In the coil component  1 , the multiple first wiring patterns  10 , the multiple second wiring patterns  20 , and the multiple third wiring patterns  30  defining the coils L 1  and L 2  are disposed inside the multilayer body  3 . A portion of the multiple third wiring patterns  30  defines the coil L 1  and the rest of the multiple third wiring patterns  30  defines the coil L 2 . That is, the multiple third wiring patterns  30  are a common portion of the coils L 1  and L 2 . Including a common portion of the coils L 1  and L 2  as in the multiple third wiring patterns  30  makes it possible to reduce variations in magnetic coupling between the coil L 1  and the coil L 2 . The coil shapes of the coils L 1  and L 2  are line-symmetrical or substantially line-symmetrical relative to the electrode  4   c.    
     Among the multiple first wiring patterns  10  laminated in the lower layer, an end portion  11  of the first wiring pattern  10  in the lowest layer is electrically connected to the electrode  4   a . The multiple first wiring patterns  10  are electrically connected to each other by a via conductor (first via conductor) not illustrated. The first via conductor may include one via conductor or multiple via conductors. It is sufficient that at least one of the multiple first wiring patterns  10  is electrically connected to the electrode  4   a.    
     Among the multiple third wiring patterns  30  laminated in the middle layer, an end portion  31  of the third wiring pattern  30  in the lowest layer is electrically connected to the electrode  4   c . The multiple third wiring patterns  30  are electrically connected to each other using a via conductor (seventh via conductor) not illustrated. Note that the seventh via conductor may include one via conductor or multiple via conductors. It is sufficient that at least one of the multiple third wiring patterns  30  is electrically connected to the electrode  4   c.    
     The third wiring patterns  30  laminated in the middle layer are electrically connected to the first wiring patterns  10  in the lower layer using via conductors (second via conductor and third via conductor) not illustrated. The second via conductor provided in the first wiring pattern  10  and the third via conductor provided in the first wiring pattern  10  are located on different side surface sides of the multilayer body  3 . Specifically, as illustrated in  FIG. 2 , the second via conductor provided in the first wiring pattern  10  is located on the first side surface side on the long side, and the first side surface side is different from the fourth side surface side on the short side on which the third via conductor provided in first wiring pattern  10  is located. 
     Among the multiple second wiring patterns  20  laminated in the upper layer, an end portion  21  of the second wiring pattern  20  in the lowest layer is electrically connected to the electrode  4   b . The multiple second wiring patterns  20  are electrically connected to each other using a via conductor  54  (fourth via conductor). Note that the via conductor  54  may include one via conductor or multiple via conductors. It is sufficient that at least one of the multiple second wiring patterns  20  is electrically connected to the electrode  4   b.    
     The second wiring patterns  20  laminated on the upper layer are electrically connected to the third wiring patterns  30  in the middle layer using via conductors  55  and  56 . Each of the via conductors  55  and  56  may include one via conductor or multiple via conductors. The via conductors  55  and  56  are electrically connected to the respective multiple second wiring patterns  20  and multiple third wiring patterns  30 . Further, the via conductor  55  (fifth via conductor) provided in the second wiring pattern  20  and the via conductor  56  (sixth via conductor) provided in the second wiring pattern  20  are located on different side surface sides of the multilayer body  3 . Specifically, as illustrated in  FIG. 2 , the second wiring pattern  20  to which the via conductor  55  is provided is located on the second side surface side on the long side, and the second side surface side is different from the fourth side surface side on the short side on which the second wiring pattern  20  to which the via conductor  56  is provided is located. 
     In the coil component  1 , the mutual inductance M between the coil L 1  and the coil L 2  is determined as a constant value by providing the configuration illustrated in  FIG. 2 . However, there is a case that adjusting the mutual inductance M between the coil L 1  and the coil L 2  is required without changing the coil component  1 . Therefore, in Preferred Embodiment 1, the mutual inductance M of the coil component  1  is adjusted with the wiring pattern provided on the substrate  2  on which the coil component  1  is mounted. 
     Returning to  FIG. 1 , the wiring line  61  is shifted in the minus direction from the center of the side surface of the coil component  1  by the shifting value X and is connected to the land electrode  60 . This makes the current flowing through the land electrode  60  flow along the side surface of the coil component  1  toward the wiring line  61 , as indicated by a solid line arrow in  FIG. 1 . The current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows in the direction opposite or substantially opposite to that of the current flowing through the land electrode  60 , as indicated by a dashed line arrow in  FIG. 1 . As a result, the magnetic field generated by the current flowing through the coil component  1  is weakened by the magnetic field generated by the current flowing through the land electrode  60 . 
     Further, the wiring line  71  is shifted in the minus direction from the center of the side surface of the coil component  1  by the shifting value Y (=the shifting value X) and is connected to the land electrode  70 . This makes the current flowing through the land electrode  70  flow along the side surface of the coil component  1  away from the wiring line  71 , as indicated by a solid line arrow in  FIG. 1 . The current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows in the direction opposite or substantially opposite to that of the current flowing through the land electrode  70 , as indicated by a dashed line arrow in  FIG. 1 . As a result, the magnetic field generated by the current flowing through the coil component  1  is weakened by the magnetic field generated by the current flowing through the land electrode  70 . 
     Thus, the magnetic field generated in the coil L 1  and the coil L 2  of the coil component  1  is weakened by the current flowing through the land electrode  60  and the land electrode  70 . This makes it possible to reduce the mutual inductance M between the coil L 1  and the coil L 2 . That is, the mutual inductance M between the coil L 1  and the coil L 2  may be adjusted by changing the shifting value of the wiring line  61  and the wiring line  71 , which are connected to the land electrode  60  and the land electrode  70 , from the center of the side surface of the coil component  1 . 
       FIG. 3  is a graph illustrating the relationship between the mutual inductance of the circuit device according to Preferred Embodiment 1 and the shifting value of the wiring portion. The graph in  FIG. 3  has a horizontal axis representing the shifting value X (mm) and a vertical axis representing the mutual inductance M (nH) between the coil L 1  and the coil L 2 . Further, the graph in  FIG. 3  describes a circuit device in which the shifting value X of the wiring line  61  and the shifting value Y of the wiring line  71  are the same or substantially the same. A point A in  FIG. 3  is the mutual inductance M of the coil component  1  in the circuit device  10 A. The mutual inductance M of the coil component  1  in the circuit device when the shifting value X is 0 (zero) is indicated by a point O. As indicated by the point A, by setting the shifting value X to about −0.9 mm, for example, the mutual inductance M may be reduced by approximately 0.06 nH (approximately 2%) relative to the point O. 
       FIGS. 4A and 4B  are plan views of another pattern of the circuit device according to Preferred Embodiment 1.  FIG. 4A  illustrates a circuit device  10 B in which the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 , and the wiring line  71  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  70 .  FIG. 4B  illustrates a circuit device  10 C in which the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 , and the wiring line  71  is shifted in the minus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  70 . In the circuit device illustrated in  FIGS. 4A and 4B , the same or corresponding components as those of the circuit device illustrated in  FIG. 1  are denoted by the same reference signs, and detailed description thereof will not be repeated. Further, the shifting values X and Y and the shifting directions of the wiring lines  61  and  71  in  FIGS. 4A and 4B  are defined as the same or substantially the same shifting values X and Y and the shifting directions of the wiring lines  61  and  71  in  FIG. 1 . 
     In the circuit device  10 B in  FIG. 4A , the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 . This makes the current flowing through the land electrode  60  flow along the side surface of the coil component  1  toward the wiring line  61 , as indicated by a solid line arrow. Meanwhile, the current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows parallel or substantially parallel to the current flowing through the land electrode  60 , as indicated by a dashed line arrow in  FIG. 4A . As a result, the magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  60 . 
     Further, the wiring line  71  is shifted in the plus direction from the center of the side surface of the coil component and is connected to the land electrode  70 . This makes the current flowing through the land electrode  70  flow along the side surface of the coil component  1  away from the wiring line  71 , as indicated by a solid line arrow in  FIG. 4A . Meanwhile, the current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows parallel or substantially parallel to the current flowing through the land electrode  70 , as indicated by a dashed line arrow in  FIG. 4A . As a result, the magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  70 . 
     A point B in  FIG. 3  is the mutual inductance M of the coil component  1  in the circuit device  10 B. As indicated by the point B, by setting the shifting value X to about +0.9 mm, for example, the mutual inductance M may be increased by approximately 0.06 nH (approximately 2%) relative to the point O. 
     In the circuit device  10 C in  FIG. 4B , the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 . This makes the current flowing through the land electrode  60  flow along the side surface of the coil component  1  toward the wiring line  61 , as indicated by a solid line arrow. Meanwhile, the current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows parallel or substantially parallel to the current flowing through the land electrode  60 , as indicated by a dashed line arrow in  FIG. 4B . As a result, the magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  60 . 
     Whereas, the wiring line  71  is shifted in the minus direction from the center of the side surface of the coil component and is connected to the land electrode  70 . This makes the current flowing through the land electrode  70  flow along the side surface of the coil component  1  away from the wiring line  71 , as indicated by a solid line arrow in  FIG. 4B . The current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows in the direction opposite or substantially opposite to that of the current flowing through the land electrode  70 , as indicated by a dashed line arrow in  FIG. 4B . As a result, the magnetic field generated by the current flowing through the coil component  1  is weakened by the magnetic field generated by the current flowing through the land electrode  70 . 
     A point C in  FIG. 3  is the mutual inductance M of the coil component  1  in the circuit device  10 C. As indicated by the point C, for example, by setting the shifting value X of the wiring line  61  to about +0.9 mm and the shifting value X of the wiring line  71  to about −0.9 mm (the point C is plotted only with the shifting value X of the wiring line  61  in the graph of  FIG. 3 ), the mutual inductance M is the same or substantially the same as that in the point O. That is, since the magnetic field on the land electrode  60  side is strengthened and the magnetic field on the land electrode  70  side is weakened, the circuit device  10 C, as a whole, has mutual inductance M equivalent to that of a circuit device in which the shifting value X is approximately 0 (zero). 
     In the circuit device, the shifting value X of the wiring line  61  and the shifting value Y of the wiring line  71  need not be the same or substantially the same and may be different from each other. For example, acceptable is a case that the shifting value X (first distance) of the wiring line  61  is about −0.9 mm and the shifting value Y (second distance) of the wiring line  71  is about +0.5 mm.  FIGS. 5A and 5B  are plan views of still another pattern of the circuit device according to Preferred Embodiment 1.  FIG. 5A  illustrates a circuit device  10 D in which the wiring line  61  is shifted in the minus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60  and the wiring line  71  is connected to the land electrode  70  at the center of the side surface of the coil component  1 .  FIG. 5B  illustrates a circuit device  10 E in which the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60  and the wiring line  71  is connected to the land electrode  70  at the center of the side surface of the coil component  1 . In the circuit device illustrated in  FIGS. 5A and 5B , the same or corresponding components as those of the circuit device illustrated in  FIG. 1  are denoted by the same reference signs, and detailed description thereof will not be repeated. Further, the shifting values X and Y and the shifting directions of the wiring lines  61  and  71  in  FIGS. 5A and 5B  are defined as the same or substantially the same as the shifting values X and Y and the shifting directions of the wiring lines  61  and  71  in  FIG. 1 . 
     In the circuit device  10 D in  FIG. 5A , the wiring line  61  is shifted in the minus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 . This makes the current flowing through the land electrode  60  flow along the side surface of the coil component  1  toward the wiring line  61 , as indicated by a solid line arrow. Whereas, the current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows in the direction opposite or substantially opposite to that of the current flowing through the land electrode  60 , as indicated by a dashed line arrow in  FIG. 5A . As a result, the magnetic field generated by the current flowing through the coil component  1  is weakened by the magnetic field generated by the current flowing through the land electrode  60 . 
     Further, the wiring line  71  is connected to the land electrode  70  at the center of the side surface of the coil component  1 . This makes the current flowing through the land electrode  70  flow orthogonal or substantially orthogonal to the side surface of the coil component  1 , as indicated by a solid line arrow in  FIG. 5A . Whereas, the current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows orthogonal or substantially orthogonal to the current flowing through the land electrode  70 , as indicated by a dashed line arrow in  FIG. 5A . As a result, the magnetic field generated by the current flowing through the coil component  1  is not affected by the magnetic field generated by the current flowing through the land electrode  70 . Accordingly, the mutual inductance M of the coil component  1  in the circuit device  10 D is larger than the mutual inductance M of the coil component  1  in the circuit device  10 A and is smaller than the mutual inductance M of the coil component  1  in the circuit device in which the shifting value X is approximately 0 (zero). 
     In the circuit device  10 E in  FIG. 5B , the wiring line  61  is shifted in the plus direction from the center of the side surface of the coil component  1  and is connected to the land electrode  60 . This makes the current flowing through the land electrode  60  flow along the side surface of the coil component  1  toward the wiring line  61 , as indicated by a solid line arrow. Meanwhile, a current flowing through the coil component  1  (the current flowing through the second wiring pattern  20 , for example) flows parallel or substantially parallel to the current flowing through the land electrode  60 , as indicated by a dashed line arrow in  FIG. 5B . As a result, the magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  60 . 
     Whereas, the wiring line  71  is connected to the land electrode  70  at the center of the side surface of the coil component  1 . This makes the current flowing through the land electrode  70  flow orthogonal or substantially orthogonal to the side surface of the coil component  1 , as indicated by a solid line arrow in  FIG. 5B . The current flowing through the coil component (the current flowing through the second wiring pattern  20 , for example) flows orthogonal or substantially orthogonal to the current flowing through the land electrode  70 , as indicated by a dashed line arrow in  FIG. 5B . As a result, the magnetic field generated by the current flowing through the coil component  1  is not affected by the magnetic field generated by the current flowing through the land electrode  70 . Accordingly, the mutual inductance M of the coil component  1  in the circuit device  10 E is smaller than the mutual inductance M of the coil component  1  in the circuit device  10 B and is larger than the mutual inductance M of the coil component  1  in the circuit device in which the shifting value X is approximately 0 (zero). 
     In the circuit device  10 A to the circuit device  10 E described above, the coil component  1  is mounted on the substrate  2 . However, a filter circuit may be configured by mounting a capacitor C 1  on the land electrode  80 .  FIG. 6  is a circuit diagram of a filter circuit including the coil component according to Preferred Embodiment 1. 
     A filter circuit  100  is an EMI suppression filter and is a third order T-type LC filter circuit, for example. The circuit device  10 A, the circuit device  10 B, the circuit device  10 C, the circuit device  10 D, or the circuit device  10 E is used in the filter circuit  100 . In the following Preferred Embodiment 1, the third order T-type LC filter circuit will be described as a configuration of the filter circuit  100 , but a multilayer substrate having a similar configuration may be applied to a fifth order T-type LC filter circuit or a higher-order T-type LC filter circuit. First, as illustrated in  FIG. 6 , the filter circuit  100  includes the capacitor C 1 , electrodes  4   a ,  4   b , and  4   c , the coil L 1  (first coil), and the coil L 2  (second coil). 
     One end of the capacitor C 1  is connected to the electrode  4   c , and the other end is connected to a GND wiring as illustrated in  FIG. 6 . Note that, the capacitor C 1  is not limited to a multilayer ceramic capacitor including, for example, BaTiO 3  (barium titanate) as a main component, and may be, for example, a multilayer ceramic capacitor including another material as a main component or may be another type of capacitor such as an aluminum electrolytic capacitor other than the multilayer ceramic capacitor. The capacitor C 1  includes an inductor L 3  as a parasitic inductance (equivalent series inductance (ESL)) and is equivalent to a circuit configuration in which the inductor L 3  is connected to a capacitor C 1   a  in series. Note that, the capacitor C 1  may be equivalent to a circuit configuration in which a parasitic resistance (equivalent series resistance (ESR)) is further connected to the inductor L 3  and the capacitor C 1   a  in series. 
     The coil L 1  and the coil L 2 , in addition to the capacitor C 1 , are connected to the electrode  4   c . The coil L 1  and the coil L 2  are magnetically coupled to each other and generate a negative inductance component (mutual inductance M). The parasitic inductance (inductor L 3 ) of the capacitor C 1  may be canceled using the negative inductance component, and the inductance component of the capacitor C 1  may be reduced. In the filter circuit  100  including the capacitor C 1 , the coil L 1 , and the coil L 2 , the parasitic inductance of the capacitor C 1  is canceled with the negative inductance component due to the mutual inductance M of the coil L 1  and the coil L 2 . Thus, the noise reduction or prevention effect in a radio frequency range can be increased. 
     As described above, the circuit device  10 A according to Preferred Embodiment 1 includes the substrate  2  on which the wiring pattern is provided and the coil component  1  to be mounted on the substrate  2 . The coil component  1  includes the coil L 1  (first coil) and the coil L 2  (second coil) provided in the multilayer body such that the coil surfaces thereof face each other in the lamination direction. Further, the coil component  1  is mounted such that the coil surfaces thereof are parallel or substantially parallel to the surface of the substrate  2 . The wiring pattern includes the land electrode  70  (first electrode portion) and the land electrode  60  (second electrode portion). The land electrode  70  is provided along the second side surface of the multilayer body  3  on which the electrode  4   b  is provided and is connected to the electrode  4   b  (input terminal) of the coil component  1 . The land electrode  60  is provided along the first side surface of the multilayer body  3  opposed to the second side surface and is connected to the electrode  4   a  (output terminal) of the coil component  1 . Further, the wiring pattern includes the wiring line (first wiring portion) and the wiring line  61  (second wiring portion). The wiring line  71  is electrically connected to the land electrode  70  at a position shifted along the second side surface from the center of the second side surface by the shifting value Y (first distance). The wiring line  61  is electrically connected to the land electrode  60  at a position shifted along the first side surface from the center of the first side surface by the shifting value X (second distance). 
     With this configuration, in the circuit device  10 A according to Preferred Embodiment 1, a current may flow along the side surface of the multilayer body  3  through the land electrode  60  and the wiring line  61 , and the land electrode  70  and the wiring line  71 . With this, the magnetic field generated by the current flowing through the coil component  1  may be weakened or strengthened by the magnetic field generated by the current flowing through the land electrodes  60  and  70 , and the mutual inductance M of the coil component  1  may be adjusted. 
     The shifting value X and the shifting value Y may be the same or substantially the same as in the circuit devices  10 A to  10 C. The wiring line  61  and the wiring line  71  may be shifted in the same direction along the side surfaces of the multilayer body  3  as in the circuit devices  10 A and  10 B. The wiring line  61  and the wiring line  71  may be shifted in different directions along the side surfaces of the multilayer body  3  as in the circuit device  10 C. The shifting value X or the shifting value Y may include distance of zero or approximately zero as in the circuit devices  10 D and  10 E. 
     The first side surface and the second side surface of the coil component  1  are surfaces parallel or substantially parallel to the longitudinal direction of the coil component  1 . Making the first side surface and the second side surface of the coil component  1  parallel or substantially parallel to the longitudinal direction of the coil component  1  allows the land electrodes  60  and  70  to be provided along the longitudinal direction of the coil component  1 . Providing the land electrodes  60  and  70  along the longitudinal direction of the coil component  1  makes it possible to elongate the current path of the land electrodes  60  and  70  that may affect the current flowing through the coil component  1 , in comparison with the case that the land electrodes  60  and  70  are provided along the lateral direction of the coil component  1 . 
     It is preferable that the coil component  1  is a transformer coil in which the coil L 1  and the coil L 2  are magnetically coupled to each other. It is preferable that in the coil component  1 , the first wiring pattern  10  to the third wiring pattern  30  (conductors) of the coil L 1  and the coil L 2  include respective portions running along the first side surface and the second side surface. 
     The filter circuit  100  includes the circuit device  10 A,  10 B,  10 C,  10 D, or  10 E and the capacitor C 1  connected to the electrode  4   c  between the coil L 1  and the coil L 2  of the coil component  1 . With this, in the filter circuit  100 , the parasitic inductance of the capacitor C 1  is canceled, and the noise reduction or prevention effect in a radio frequency range may be increased. 
     Preferred Embodiment 2 
     In the circuit device  10 A according to Preferred Embodiment 1, the wiring lines  61  and  71  are formed in advance at positions shifted by the shifting value X (first distance) relative to the land electrodes  60  and  70 . A circuit device according to Preferred Embodiment 2 of the present invention has a configuration in which a connecting position of a wiring line to a land electrode may be changed at the time of mounting the component.  FIGS. 7A and 7B  are plan views of the circuit device according to Preferred Embodiment 2. In the circuit device in  FIGS. 7A and 7B , the same or corresponding components as those of the circuit device  10 A in  FIG. 1  are denoted by the same reference signs, and detailed description thereof will not be repeated. Dashed-and-dotted lines in  FIGS. 7A and 7B  represent the center of the side surface of the coil component  1  and the wiring lines, and a lower side in the drawing is defined as the minus (negative) direction and an upper side in the drawing is defined as the plus (positive) direction. 
     The coil component  1  is mounted on the surface of the substrate  2  of a circuit device  15 A in  FIG. 7A . Land electrodes  62  and  72  and the land electrodes  80  and  81  for surface-mounting the coil component  1  are provided on the surface of the substrate  2 . The land electrode  62  is connected to the electrode  4   a  that is the output terminal to output a current from the coil component  1 , and the land electrode  72  is connected to the electrode  4   b  that is the input terminal to input a current to the coil component  1 . Note that, the direction of the current flowing through the coil component  1  may be changed such that the current is inputted through the electrode  4   a  as the input terminal and is outputted through the electrode  4   b  as the output terminal. 
     The land electrode  62  includes a connection portion  62   a  ( 1 A connection portion) and a connection portion  62   b  ( 1 B connection portion). The connection portion  62   a  is provided at a position shifted in the plus direction from the center of the side surface (first side surface on which the electrode  4   a  is provided) of the coil component  1  by the shifting value X (first distance). The connection portion  62   b  is provided at a position shifted in the minus direction from the center of the side surface of the coil component  1  by the shifting value X. A wiring line  63  includes an end portion  63   a  ( 1 A end portion) extending to the position facing the connection portion  62   a  and an end portion  63   b  ( 1 B end portion) extending to the position facing the connection portion  62   b . As a result, at the time of mounting the component, it is possible to select whether the connection portion  62   a  and the end portion  63   a  are connected by a connection element  90  (a zero ohm chip, for example) or the connection portion  62   b  and the end portion  63   b  are connected by the connection element  90 . 
     The land electrode  72  includes a connection portion  72   a  ( 2 A connection portion) and a connection portion  72   b  ( 2 B connection portion). The connection portion  72   a  is provided at a position shifted in the plus direction from the center of the side surface of the coil component  1  by the shifting value Y (second distance), and the connection portion  72   b  is provided at a position shifted in the minus direction from the center of the side surface of the coil component  1  by the shifting value Y. A wiring line  73  includes an end portion  73   a  ( 2 A end portion) extending to the position facing the connection portion  72   a  and an end portion  73   b  ( 2 B end portion) extending to the position facing the connection portion  72   b . As a result, at the time of mounting the component, it is possible to select whether the connection portion  72   a  and the end portion  73   a  are connected by a connection element  91  (a zero ohm chip, for example) or the connection portion  72   b  and the end portion  73   b  are connected by the connection element  91 . 
     In the circuit device  15 A in  FIG. 7A , the connection element  90  connects the connection portion  62   b  and the end portion  63   b , and the connection element  91  connects the connection portion  72   a  and the end portion  73   a . As a result, in the circuit device  15 A, the wiring line  63  and the land electrode  62  are connected to each other at a position shifted in the minus direction from the center of the side surface of the coil component  1  by the shifting value X, and a current flowing through the land electrode  62  flows along the side surface of the coil component  1  toward the connection portion  62   b , as indicated by a solid line arrow in  FIG. 7A . Whereas, the current flowing through the coil component  1  flows in the direction opposite or substantially opposite to that of the current flowing through the land electrode  62 , as indicated by a dashed line arrow in  FIG. 7A . The magnetic field generated by the current flowing through the coil component  1  is weakened by the magnetic field generated by the current flowing through the land electrode  62 . 
     Further, in the circuit device  15 A, the wiring line  73  and the land electrode  72  are connected to each other at a position shifted in the plus direction from the center of the side surface of the coil component  1  by the shifting value Y, and a current flowing through the land electrode  72  flows along the side surface of the coil component  1  toward the connection portion  72   b , as indicated by a solid line arrow in  FIG. 7A . Meanwhile, the current flowing through the coil component  1  flows parallel or substantially parallel to the current flowing through the land electrode  72 , as indicated by a dashed line arrow in  FIG. 7A . The magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  72 . 
     In a circuit device  15 B in  FIG. 7B , the connection element  90  connects the connection portion  62   a  and the end portion  63   a , and the connection element  91  connects the connection portion  72   a  and the end portion  73   a . As a result, in the circuit device  15 B, the wiring line  63  and the land electrode  62  are connected to each other at a position shifted in the plus direction from the center of the side surface of the coil component  1  by the shifting value X, and a current flowing through the land electrode  62  flows along the side surface of the coil component  1  toward the connection portion  62   a , as indicated by a solid line arrow in  FIG. 7B . Meanwhile, the current flowing through the coil component  1  flows parallel or substantially parallel to the current flowing through the land electrode  62 , as indicated by a broken line arrow in  FIG. 7B . The magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  62 . 
     Further, in the circuit device  15 B, the wiring line  73  and the land electrode  72  are connected to each other at a position shifted in the plus direction from the center of the side surface of the coil component  1  by the shifting value Y, and a current flowing through the land electrode  72  flows along the side surface of the coil component  1  toward the connection portion  72   b  from the connection portion  72   a , as indicated by a solid line arrow in  FIG. 7B . Meanwhile, the current flowing through the coil component  1  flows parallel or substantially parallel to the current flowing through the land electrode  72 , as indicated by a broken line arrow in  FIG. 7B . The magnetic field generated by the current flowing through the coil component  1  is strengthened by the magnetic field generated by the current flowing through the land electrode  72 . 
     In the circuit device, the shifting value X of the connection portions  62   a  and  62   b  and the shifting value Y of the connection portions  72   a  and  72   b  need not be the same or substantially the same and may be different from each other. Further, the shifting value of the connection portion  62   a  and the shifting value of the connection portion  62   b  need not be the same or substantially the same and may be different from each other. Furthermore, the shifting value of the connection portion  72   a  and the shifting value of the connection portion  72   b  need not be the same or substantially the same and may be different from each other.  FIGS. 8A and 8B  are plan views of still another pattern of the circuit device according to Preferred Embodiment 2. In circuit devices  15 C and  15 D in  FIGS. 8A and 8B , the land electrode  62  includes the connection portions  62   a  and  62   b  and is connected to the wiring line  63 , and the wiring line  71  is connected to the land electrode  70  at the center or approximate center of the side surface of the coil component  1 . 
     In the circuit device  15 C in  FIG. 8A , the connection element  90  connects the connection portion  62   b  and the end portion  63   b . In the circuit device  15 D in  FIG. 8B , the connection element  90  connects the connection portion  62   a  and the end portion  63   a.    
     As described above, in the circuit devices  15 A and  15 B according to Preferred Embodiment 2, the land electrode  62  (first electrode portion) includes the connection portion  62   a  ( 1 A connection portion) and the connection portion  62   b  ( 1 B connection portion). The connection portion  62   a  is provided at a position shifted in the plus direction (first direction) along the first side surface from the center of the first side surface by the shifting value X (first distance). The connection portion  62   b  is provided at a position shifted in the minus direction (second direction) along the first side surface from the center of the first side surface by the shifting value X. The land electrode  72  (second electrode portion) includes the connection portion  72   a  ( 2 A connection portion) and the connection portion  72   b  ( 2 B connection portion). The connection portion  72   a  is provided at a position shifted in the plus direction along the second side surface from the center of the second side surface by the shifting value Y (second distance). The connection portion  72   b  is provided at a position shifted in the minus direction along the second side surface from the center of the second side surface by the shifting value Y. The wiring line  63  (first wiring portion) includes the end portion  63   a  ( 1 A end portion) extending to the position facing the connection portion  62   a  and the end portion  63   b  ( 1 B end portion) extending to the position facing the connection portion  62   b . The wiring line  73  (second wiring portion) includes the end portion  73   a  ( 2 A end portion) extending to the position facing the connection portion  72   a  and the end portion  73   b  ( 2 B end portion) extending to the position facing the connection portion  72   b . The circuit devices  15 A and  15 B include the connection element  90  (first connection element) that electrically connects between the connection portion  62   a  and the end portion  63   a  or between the connection portion  62   b  and the end portion  63   b , and the connection element  91  (second connection element) that electrically connects between the connection portion  72   a  and the end portion  73   a  or between the connection portion  72   b  and the end portion  73   b.    
     With this, in the circuit devices  15 A and  15 B according to Preferred Embodiment 2, a current may flow along the side surface of the multilayer body  3  through the land electrode  62  and the wiring line  63 , and the land electrode  72  and the wiring line  73 . With this, the magnetic field generated by the current flowing through the coil component  1  may be weakened or strengthened by the magnetic field generated by the current flowing through the land electrodes  62  and  72 . This makes it possible to adjust the mutual inductance M of the coil component  1 . 
     The filter circuit includes the circuit device  15 A,  15 B,  15 C, or  15 D and the capacitor C 1  connected to the electrode  4   c  between the coil L 1  and the coil L 2  of the coil component  1 . With this, in the filter circuit, the parasitic inductance of the capacitor C 1  is canceled, and the noise reduction or prevention effect in a radio frequency range may be increased. 
     Preferred Embodiment 3 
     In Preferred Embodiment 2, described is the configuration in which, at the time of mounting the component, the connection element  90  can electrically connect the connection portion  62   a  and the end portion  63   a  or the connection portion  62   b  and the end portion  63   b , and the connection element  91  can electrically connect the connection portion  72   a  and the end portion  73   a  or the connection portion  72   b  and the end portion  73   b . In Preferred Embodiment 3 of the present invention, a configuration of a circuit device in which whether or not to include the coil component  1  can be determined at the time of mounting the component will be described. 
       FIGS. 9A and 9B  are plan views of the circuit device according to Preferred Embodiment 3.  FIG. 9A  is a plan view of a circuit device  18 A on which the coil component  1  is mounted, and  FIG. 9B  is a plan view of a circuit device  18 B on which the coil component  1  is not mounted. In the circuit device  18 A and the circuit device  18 B, land electrodes and wiring patterns for mounting the coil component  1 , the capacitor C 1 , a capacitor C 2 , or the like are identically or substantially identically provided on the surface of the substrate  2 . 
     Specifically, as illustrated in  FIG. 9A , the wiring pattern includes wiring lines  65  and  75  to be connected to the input/output terminal of the coil component  1 , a land electrode  85  to connect the coil component  1  and the capacitor C 1 , a wiring line  86  to connect the capacitor C 1  and the capacitor C 2 , and a land electrode  87  to be connected to the capacitor C 2 . 
     In the circuit device  18 A, as illustrated in  FIG. 9A , the coil component  1  is mounted at a position to be connected to the wiring lines  65  and  75  and the land electrode  85 . In the circuit device  18 A, since the coil component  1  is mounted, the capacitor C 1  is mounted at the position to connect the land electrode  85  and the wiring line  86 . 
     Whereas, in the circuit device  18 B, since the coil component  1  is not mounted, as illustrated in  FIG. 9B , a connection element  300  (a zero ohm chip, for example) to connect the wiring line  65  and the wiring line  75  is mounted. In the circuit device  18 B, since the coil component  1  is not mounted, the capacitor C 1  is not mounted at the position to connect the land electrode  85  and the wiring line  86 , but the capacitor C 1  is mounted between the wiring line  75  and the wiring line  86 . 
     As can be seen from  FIGS. 9A and 9B , the circuit devices  18 A and  18 B include the land electrode  85 , the wiring line  86 , or the like so that the mounting position of the capacitor C 1  may be changed depending on whether the coil component  1  is mounted, and the mounting position of the capacitor C 2  is not changed. 
       FIGS. 10A and 10B  is a plan view of another pattern of the circuit device according to Preferred Embodiment 3.  FIG. 10A  is a plan view of a circuit device  18 C on which the coil component  1  is mounted, and  FIG. 10B  is a plan view of a circuit device  18 D on which the coil component  1  is not mounted. In the circuit device  18 C and the circuit device  18 D, land electrodes and wiring patterns to mount the coil component  1 , the capacitors C 1  and C 2 , or the like are identically or substantially identically provided on the surface of the substrate  2 . 
     The wiring pattern of the circuit device  18 C and the circuit device  18 D differs from the wiring pattern of the circuit device  18 A and the circuit device  18 B in the shape of a wiring line  86   a . In the case of the circuit device  18 A and the circuit device  18 B, the wiring line  86  has a shape that the capacitor C 1  and the capacitor C 2  may be mounted on a straight line when the coil component  1  is not mounted. Whereas, in the case of the circuit device  18 C and the circuit device  18 D, the wiring line  86   a  has a shape that the capacitor C 1  and the capacitor C 2  may be mounted on a straight or substantially straight line when the coil component  1  is mounted. In the circuit device  18 D in  FIG. 10B , when the coil component  1  is not mounted, an unnecessary inductance component is generated in the portion of the wiring line  86   a , and the radio frequency characteristics deteriorate. However, in the circuit device  18 A in  FIG. 9A , even when an unnecessary inductance component is generated in the portion of the wiring line  86 , since the coil component  1  is mounted, the inductance component may be canceled. 
       FIGS. 11A and 11B  are plan views of a comparative example of the circuit device according to Preferred Embodiment 3.  FIG. 11A  is a plan view of a circuit device  18 E on which the coil component  1  is mounted, and  FIG. 11B  is a plan view of a circuit device  18 F on which the coil component  1  is not mounted. In the circuit device  18 E and the circuit device  18 F, land electrodes and wiring patterns to mount the coil component  1 , the capacitors C 1  and C 2 , or the like are identically or substantially identically provided on the surface of the substrate  2 . 
     Specifically, as illustrated in  FIG. 11A , the wiring pattern includes the wiring lines  65  and  75  to be connected to the input/output terminal of the coil component  1 , a land electrode  85  to connect the coil component  1  and the capacitor C 1 , a wiring line  86   b  to connect the capacitor C 1  and the capacitor C 2 , and a land electrode  87   b  to be connected to the capacitor C 2 . 
     Further, as illustrated in  FIG. 11B , the wiring pattern includes a wiring line  86   c  to connect the capacitor C 1  and the capacitor C 2  when the coil component  1  is not mounted, and a land electrode  87   c  to be connected to the capacitor C 2 . 
     In the circuit devices  18 A to  18 D in  FIGS. 9A and 9B  and  FIGS. 10A and 10B , the wiring patterns are provided such that the mounting position of the capacitor C 2  is not changed depending on whether the coil component  1  is mounted. This makes it possible to reduce the mounting area of the components on the substrate  2 , in comparison with the circuit devices  18 E and  18 F in  FIGS. 11A and 11B . In the circuit devices  18 A to  18 D in  FIGS. 9A and 9B  and  FIGS. 10A and 10B , it is sufficient that a wiring pattern capable of changing only the mounting position of the capacitor C 1  is provided on the surface of the substrate  2 . 
     While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.