JP2015186011A - Coil element and communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil element that prevents its thickness in a lamination direction from becoming larger and can prevent the electrical characteristic of a coil from departing from a desired characteristic even if a metal body is placed in proximity.SOLUTION: A coil element 80 comprises: a laminate made by stacking a plurality of insulation layers 82; coil conductor patterns 84a, 84b that are provided on main surfaces 83a, 83b of any insulation layers 82a, 82b among the plurality of insulation layers and form part of a coil whose winding axis is a direction orthogonal to the lamination direction of the plurality of insulation layers 82; and a frame-shaped conductor pattern 87 that is the same layer as the coil conductor patterns 84a, 84b and provided so as to surround the coil viewed from the lamination direction.

Description

  The present invention relates to a coil element and a communication terminal device.

  RFID system that communicates reader / writer and RFID (Radio Frequency Identification) tag in a non-contact manner and transmits information between the reader / writer and RFID tag, and short-range wireless communication in which two communication devices communicate at a short distance (NFC: Near Field Communication) system is known.

  An RFID system or a short-range wireless communication system is introduced into a communication terminal device such as a mobile phone, and the communication terminal device may be used as an RFID tag or a reader / writer, or may be used as a short-range wireless communication terminal.

  In order to communicate using an RFID system or a short-range wireless communication system, an antenna including a coil is provided in a communication terminal device. As a document disclosing such an antenna, for example, Japanese Patent Application Laid-Open No. 2007-19891 (Patent Document 1) is cited.

  The antenna disclosed in Patent Document 1 includes a plurality of magnetic layers provided with a coil conductor pattern that forms a coil, a first insulating layer facing the magnetic layer, and a solid film-like conductor over substantially the entire main surface. The second insulating layer provided with the layer is stacked. The second insulating layer is arranged to face the first insulating layer on the side opposite to the side where the magnetic layer is located when viewed from the first insulating layer.

  In the configuration of Patent Document 1, even when the coil is arranged close to a metal object, the antenna characteristic deviates from the desired characteristic because the solid film-like conductor layer functions as a shield. Can be suppressed.

JP 2007-19891 A

  However, in the configuration disclosed in Patent Document 1, a second insulating layer having a solid film-like conductor layer is provided separately from the plurality of magnetic layers provided with the coil conductor pattern that forms the coil. Therefore, there is a problem that the thickness of the antenna in the stacking direction is increased.

  The present invention has been made in view of the above problems, and an object of the present invention is a case where metal bodies are arranged close to each other while suppressing an increase in thickness in the stacking direction. It is another object of the present invention to provide a coil element and a communication terminal device that can suppress the electrical characteristics of the coil from deviating from desired characteristics.

  The coil element according to the present invention is provided on the main surface of any one of the plurality of insulating layers and the stacked body in which the plurality of insulating layers are stacked, and is orthogonal to the stacking direction of the plurality of insulating layers. A coil conductor pattern constituting a part of a coil whose direction is a winding axis, and a frame-like conductor pattern provided on the same layer as the coil conductor pattern and surrounding the coil when viewed from the laminating direction; .

  In the coil element according to the present invention, the frame-like conductor pattern is preferably provided on the main surface of the insulating layer provided with the coil conductor pattern.

  In the coil element according to the present invention, it is preferable that a plurality of the coil conductor patterns are provided on the main surface of the insulating layer. In this case, the frame-shaped conductor pattern is a region surrounded by the outer peripheral portion passing through a gap between the outer peripheral portion that surrounds the outside of the plurality of coil conductor patterns and any two of the plurality of coil conductor patterns. It is preferable to include a separation part for separating.

  In the coil element according to the present invention, when the outer peripheral length of the frame-like conductor pattern is A, the operating frequency is f, and the speed of light is c, the above condition is satisfied so as to satisfy the relationship of A <c / f. A frame-like conductor pattern is preferably formed.

  A communication terminal device according to the present invention includes the coil element and a metal body provided so as to overlap the coil element when viewed from the stacking direction, and the frame conductor pattern includes the coil conductor pattern. The main surface of the plurality of insulating layers provided is provided on the main surface closest to the metal body.

  According to the present invention, it is possible to prevent the electrical characteristics of the coil from deviating from desired characteristics even when the metal bodies are arranged close to each other while suppressing an increase in the thickness in the stacking direction. The coil element and communication terminal device which can be provided can be provided.

3 is a schematic diagram showing a configuration of a communication terminal apparatus according to Embodiment 1. FIG. 3 is a circuit diagram illustrating a configuration of a power feeding circuit including a coil element according to Embodiment 1. FIG. FIG. 3 is a schematic cross-sectional view along the longitudinal direction in the central portion of the coil element according to the first embodiment. It is a disassembled perspective view of the coil element arrange | positioned in the vicinity of the flat conductor shown in FIG. It is a figure for demonstrating the outer periphery length of the frame-shaped conductor pattern which concerns on Embodiment 1. FIG. It is a figure which shows the electric current which flows into the frame-shaped conductor pattern contained in the coil element in a comparative example. 4 is a diagram showing a current flowing through a frame-shaped conductor pattern included in the coil element according to Embodiment 1. FIG. It is a figure which shows the wiring board and coil element which are equipped with the communication terminal device which concerns on Embodiment 2. FIG. It is a disassembled perspective view of the coil element arrange | positioned in the vicinity of the wiring board shown in FIG. 6 is a schematic diagram illustrating a configuration of a communication terminal apparatus according to Embodiment 3. FIG. It is a disassembled perspective view of the coil element arrange | positioned between a plane conductor and a battery pack. 6 is an exploded perspective view of a coil element according to Embodiment 4. FIG. It is a figure for demonstrating the outer periphery length of the several frame-shaped conductor pattern formed by dividing a frame-shaped conductor pattern by the isolation | separation part shown in FIG. It is a figure which shows the electric current which flows into the some frame-shaped conductor pattern shown in FIG. 10 is an exploded perspective view of a coil element according to Embodiment 5. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a configuration of a communication terminal apparatus according to the present embodiment. In FIG. 1, the state which removed the housing | casing cover of the communication terminal device is shown. FIG. 2 is a circuit diagram showing a configuration of a power feeding circuit including a coil element according to the present embodiment. With reference to FIG. 1 and FIG. 2, the communication terminal device 1 which concerns on this Embodiment is demonstrated.

  As illustrated in FIG. 1, the communication terminal device 1 includes a housing cover 10, a housing 20, wiring boards 31 and 32, antennas 3 </ b> A and 3 </ b> B, a battery pack 40, a camera module 50, an integrated circuit 70, and a coil element 80. .

  The housing cover 10 includes a planar conductor 11 as a metal body and a circular opening 12. The planar conductor 11 has a rectangular shape and is provided to face the battery pack 40 and the wiring board 31. The planar conductor 11 is provided so as not to overlap the antennas 3A and 3B. The planar conductor 11 is positioned above the coil element 80 in the vicinity of the coil element 80. The opening 12 is provided so that the lens part provided in the camera module 50 is exposed.

  The housing cover 10 and the housing 20 house the wiring boards 31 and 32, the battery pack 40, the camera module 50, the integrated circuit 70, and the coil element 80 in the housing space surrounded by them.

  The wiring board 31 and the wiring board 32 are provided around the battery pack 40. The wiring board 31 and the wiring board 32 are connected by a cable 33. The wiring board 31 and the camera module 50 are connected by a cable 51. The wiring board 31 is provided with an antenna 3A, bonding conductors 61 and 62, an integrated circuit 70, a coil element 80, various electronic components, and the like. The wiring board 32 is provided with an antenna 3B and various electronic components. The joining conductors 61 and 62 are in contact with the planar conductor 11 in a state where the housing cover 10 is installed in the housing 20.

  A current flows from the power feeding unit (not shown) to the antenna 3A and the antenna 3B. A current flows from the power feeding unit (not shown) to the planar conductor 11 via the junction conductors 61 and 62. Thereby, the antennas 3A and 3B and the planar conductor 11 function as a main antenna for communication of the communication terminal device 1.

  As shown in FIG. 2, a capacitor and a coil element 80 are connected in parallel to the integrated circuit 70. Thereby, the power feeding circuit 90 is configured. In FIG. 1, the capacitor is omitted. Here, assuming that the inductance value of the coil element 80 is L1 and the capacitance value of the capacitor 71 is C1, the resonance frequency of the parallel resonance circuit is substantially determined by L1 and C1. FIG. 2 also shows the resistance component R1 of the coil element. In addition, a matching circuit may be connected between the coil element 80 and the integrated circuit 70 as necessary.

  FIG. 3 is a schematic cross-sectional view along the longitudinal direction in the central portion of the coil element according to the present embodiment. FIG. 4 is an exploded perspective view of a coil element disposed in the vicinity of the flat conductor shown in FIG. The coil element according to the present embodiment will be described with reference to FIGS. 3 and 4.

  As shown in FIGS. 3 and 4, the coil element 80 includes a laminated body 81, a coil 86, a frame-shaped conductor pattern 87, and external electrodes 84c1 and 84c2. The stacked body 81 is formed by stacking a plurality of insulating layers 82 in a predetermined stacking direction (Z-axis direction). Note that the number of the insulating layers 82 can be selected as appropriate.

  The insulating layer 82 is made of, for example, LCP (liquid crystal polymer) that is a thermoplastic resin. By using the low dielectric constant LCP, it is possible to suppress the formation of capacitance with the frame-like conductor pattern 87 described later. In addition to LCP, the material of the insulating layer 82 may be PEEK (polyether ether ketone), PEI (polyether imide), PPS (poniphenylene sulfide), PI (polyimide), or the like.

  The coil 86 includes a plurality of coil conductor patterns 84 a and 84 b and a plurality of interlayer connection conductors 85. The coil 86 is formed with a direction (X-axis direction) orthogonal to the stacking direction as a winding axis. The coil 86 is formed by electrically connecting a coil conductor pattern provided on the main surface provided on the main surface of any one of the plurality of insulating layers in the stacking direction. Specifically, the coil 86 electrically connects each of the plurality of coil conductor patterns 84a and 84b provided on the main surfaces 83a and 83b of at least two insulating layers 82a and 82b of the four insulating layers 82 in the stacking direction. It is formed by connecting to. The number of turns of the coil 86 can be appropriately selected according to a desired inductance value.

  The coil conductor patterns 84a and 84b are planar conductors made of a conductor foil. The coil conductor patterns 84 a and 84 b constitute a part of the coil 86. The plurality of coil conductor patterns 84a are provided, for example, so as to extend in the short side direction (Y-axis direction) of the insulating layer 82. The plurality of coil conductor patterns 84a are provided apart from each other along the longitudinal direction (X-axis direction) of the insulating layer 82, that is, the direction in which the winding axis extends.

  The coil conductor pattern 84b is provided so as to be inclined in the Y-axis negative direction as it goes in the X-axis positive direction. When viewed from the stacking direction, the rear end portion (end portion on the Y-axis positive direction side) of the coil conductor pattern 84b is the rear end portion (Y-axis portion) of one of the two coil conductor patterns 84a adjacent to each other. The front end of the coil conductor pattern 84b (the end on the Y-axis negative direction side) overlaps the front end of the other coil conductor pattern 84a in the two adjacent coil conductor patterns 84a (Y It overlaps the end of the negative shaft side.

  When viewed from the stacking direction, the rear end portion of the coil conductor pattern 84b and the rear end portion of the coil conductor pattern 84a that overlap each other are a plurality of interlayer connection conductors connected in the stacking direction as shown by the broken lines in FIG. It is electrically connected by 85. Further, when viewed from the stacking direction, the front end portion of the coil conductor pattern 84b and the front end portion of the coil conductor pattern 84a that overlap each other are a plurality of interlayer connection conductors connected in the stacking direction, as shown by the broken lines in FIG. It is electrically connected by 85.

  The external electrodes 84c1 and 84c2 are provided on the main surface 83c of the insulating layer 82c farthest from the planar conductor 11 provided on the housing cover 10. The external electrode 84c1 is electrically connected to one end side of the coil 86 by a plurality of interlayer connection conductors 85 connected in the stacking direction. The external electrode 84c2 is electrically connected to the other end side of the coil 86 by a plurality of interlayer connection conductors 85 connected in the stacking direction. In addition, the coil element 80 and the integrated circuit 70 are electrically connected via the external electrode 84c1 and the external electrode 84c2.

  The frame-shaped conductor pattern 87 has a frame shape. The frame-like conductor pattern 87 is provided so as to surround the coil 86 when viewed from the stacking direction. The frame-like conductor pattern 87 is provided on the main surface of the insulating layer provided with the coil conductor pattern. Specifically, the frame-like conductor pattern 87 is provided on the main surface 83a of the insulating layer 82a closest to the planar conductor 11 among the plurality of insulating layers 82a and 82b provided with the coil conductor patterns 84a and 84b. The frame-like conductor pattern 87 is provided on the same layer as the coil conductor pattern 84a. That is, the frame-like conductor pattern 87 is provided at the same height as the coil conductor pattern 84a.

  The frame-like conductor pattern 87 is preferably made of a conductor foil, and is preferably patterned simultaneously when the coil conductor pattern 84a is patterned. The frame-like conductor pattern 87 may be provided in another insulating layer different from the insulating layer 82a. In this case, a frame-like conductor pattern 87 is provided on the main surface of the other insulating layer. For example, the main surface on which the frame-shaped conductor pattern 87 is formed and the main surface of the insulating layer 82a on which the coil conductor pattern 84a is formed are laminated facing each other. Also in this case, the frame-shaped conductor pattern 87 is provided on the same layer and at the same height as the coil conductor pattern 84a.

  The coil element 80 configured as described above is provided so as to overlap the planar conductor 11 when viewed from the stacking direction.

  FIG. 5 is a diagram for explaining the outer peripheral length of the frame-shaped conductor pattern according to the present embodiment. With reference to FIG. 5, the outer peripheral length of the frame-shaped conductor pattern 87 is demonstrated.

  As shown in FIG. 5, the frame-shaped conductor pattern 87 is formed in a rectangular frame shape, and a pair of side portions 87 a and 87 c extending in the short direction and a pair of side portions 87 b extending in the longitudinal direction. 87d. The outer peripheral length A of the frame-shaped conductor pattern 87 is the sum of the lengths L1, L2, L3, and L4 of the side portions 87a, 87b, 87c, and 87d. The lengths L1, L2, L3, and L4 are the lengths at the centers in the width direction of the side portions 87a, 87b, 87c, and 87d, respectively. The frame-like conductor pattern 87 satisfies the relationship of A <c / f, where A is the outer peripheral length, f is the frequency (use frequency) of the signal applied to the coil 86, and c is the speed of light. It is preferable to be provided. The reason for this will be described below with reference to FIGS.

  FIG. 6 is a diagram illustrating a current flowing through a frame-shaped conductor pattern included in the coil element in the comparative example. With reference to FIG. 6, the electric current which flows into the frame-shaped conductor pattern contained in the coil element in a comparative example is demonstrated.

  In the coil element in the comparative example, a frame-like conductor pattern is provided so as to satisfy the relationship of A = c / f, where A is the outer peripheral length, f is the operating frequency, and c is the speed of light. . That is, the outer peripheral length A of the frame-like conductor pattern is the same as one wavelength of the high frequency used.

  At the time of data transmission to a communication partner, the above-described integrated circuit 70 (see FIG. 1) applies a high frequency signal (high frequency current) to the coil 86 and the capacitor. The coil 86 induces a magnetic field by this high frequency current.

  Since the phase of the high frequency is inverted every half wavelength, in the frame-shaped conductor pattern of the comparative example having an outer peripheral length of one wavelength, when a magnetic field is induced by the coil, the current I2 that flows clockwise through the frame-shaped conductor pattern And the current I1 flowing counterclockwise is offset. For this reason, a magnetic field that cancels the change in the surrounding magnetic field is not generated from the frame-shaped conductor pattern, and the shielding effect is weakened.

  If the shielding effect is not sufficient, the magnetic flux passing through the coil body passes through the planar conductor located above the coil element. As a result, the coil element and the planar conductor are magnetically coupled, and an eddy current is generated in the planar conductor. As a result, in the coil element in the comparative example, the electrical characteristics deviate from the desired characteristics.

  FIG. 7 is a diagram showing a current flowing through the frame-shaped conductor pattern included in the coil element according to the embodiment. With reference to FIG. 7, the current flowing through the frame-shaped conductor pattern included in the coil element according to the present embodiment will be described.

  In the coil element 80 according to the present embodiment, when the outer peripheral length is A, the operating frequency is f, and the speed of light is c, the frame-shaped conductor pattern 87 is set so as to satisfy the relationship of A <c / f. Is provided. That is, the outer peripheral length A of the frame-like conductor pattern is shorter than one wavelength of the high frequency used.

  In this case, when a magnetic field is induced by the coil, for example, the current I1 flowing counterclockwise is larger than the current I2 flowing clockwise through the frame-like conductor pattern, and the current flows counterclockwise as a whole. Flowing. Thus, in the present embodiment, an induced current is induced in the frame-shaped conductor pattern 87 by the magnetic field from the coil 86. A secondary magnetic field due to the induced current is generated so as to cancel the magnetic field from the coil 86. Thereby, magnetic field coupling between the coil element 80 and the planar conductor 11 can be suppressed. As a result, in the coil element 80 according to the present embodiment, the electrical characteristics can be prevented from deviating from the desired characteristics. In the case of A> c / f, since the outer peripheral length A is increased, the frame-shaped conductor pattern is increased and the coil element is increased in size.

  As described above, by providing the frame-like conductor pattern 87, magnetic field coupling between the coil element 80 and the planar conductor 11 can be suppressed. Thereby, it can suppress that the electrical characteristic of the coil element 80 shift | deviates from a desired characteristic.

  Further, by providing the frame-shaped conductor pattern 87 and the coil conductor pattern 84a in the same insulating layer, it is not necessary to prepare a frame-shaped conductor pattern 87 alone, so that the thickness in the stacking direction increases. The manufacturing cost can be reduced while suppressing the above.

  Further, in the present embodiment, when viewed from the stacking direction of the insulating layers, the coil conductor pattern 84a and the frame-shaped conductor pattern 87 do not overlap with each other, and the frame shape so as to surround the outside of the plurality of coil conductor patterns 84a. By providing the conductor pattern 87, it is possible to suppress the formation of a capacitance between the frame-like conductor pattern 87 and the coil conductor pattern 84a.

  Furthermore, by providing the frame-like conductor pattern 87, the magnetic field from the coil element 80 becomes difficult to be coupled with electronic components located around the coil element 80. Thereby, it can also suppress that the electrical characteristic of a peripheral electronic component shifts | deviates from a desired characteristic.

(Embodiment 2)
FIG. 8 is a diagram showing a wiring board and coil elements provided in the communication terminal device according to the present embodiment. With reference to FIG. 8, communication terminal apparatus 1A according to the present embodiment will be described.

  As shown in FIG. 8, the communication terminal device 1A according to the present embodiment has a ground in which a planar conductor as a metal body is mounted on a wiring board 31 when compared with the communication terminal device 1 according to the first embodiment. The point that it is the electrode 36 is different, and accordingly, the configuration of the coil element 80A is different. Other configurations are almost the same.

  The ground electrode 36 is provided on the main surface of the wiring board 31 over a wide range so as not to overlap the antennas 3A and 3B (see FIG. 1) when viewed from the normal direction of the main surface of the wiring board 31. . The external electrodes 84c1 and 84c2 of the coil element 80A are connected to lands 35A and 35B separated from the ground electrode 36 by using a joining member such as solder. At least a part of the ground electrode 36 is provided so as to overlap the coil element 80A when viewed from the stacking direction.

  FIG. 9 is an exploded perspective view of a coil element disposed in the vicinity of the wiring board shown in FIG. A coil element 80A according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 9, the coil element 80 </ b> A differs from the coil element 80 according to Embodiment 1 in the position where the frame-shaped conductor pattern 87 is provided. Other configurations are substantially the same.

  In the present embodiment, coil element 80A is located above ground electrode 36 as a metal body. The frame-shaped conductor pattern 87 is provided on the main surface 83b of the insulating layer 82b closest to the ground electrode 36 among the main surfaces 83a and 83b of the plurality of insulating layers 82a and 82b provided with the coil conductor patterns 84a and 84b. .

  By having such a configuration, also in the present embodiment, it is possible to suppress the magnetic coupling between the coil element 80A and the ground electrode 36 while suppressing an increase in the thickness in the stacking direction. For this reason, also in the present embodiment, substantially the same effect as in the first embodiment can be obtained.

(Embodiment 3)
FIG. 10 is a schematic diagram showing the configuration of the communication terminal apparatus according to the present embodiment. With reference to FIG. 10, communication terminal apparatus 1B according to the present embodiment will be described.

  As illustrated in FIG. 10, the communication terminal device 1 </ b> B differs from the communication terminal device 1 according to Embodiment 1 in the arrangement of the battery pack 40 and the wiring boards 31 and 32. Other configurations are substantially the same.

  The wiring boards 31 and 32 are arranged so as to overlap with a predetermined interval in the normal direction of the main surface of the wiring boards 31 and 32. The battery pack 40 is disposed on the wiring substrate 32 and is disposed between the wiring substrate 31 and the wiring substrate 32. A coil element 80 </ b> B is provided on the wiring board 31 so as to be positioned above the battery pack 40. The planar conductor 11 (see FIG. 11) is disposed above the coil element 80B. Thus, the battery pack 40 and the planar conductor 11 are provided so as to overlap the coil element 80B when viewed from the stacking direction of the insulating layers.

  FIG. 11 is an exploded perspective view of the coil element disposed between the planar conductor and the battery pack. A coil element 80B according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 11, the coil element 80B is different from the coil element 80 according to the first embodiment in that a plurality of frame-shaped frame-like conductor patterns 87A and 87B are provided. Other configurations are substantially the same.

  In the present embodiment, coil element 80B is located between planar conductor 11 as the metal body and battery pack 40. The frame-shaped conductor pattern 87A is provided on the main surface 83a of the insulating layer 82a closest to the planar conductor 11 among the main surfaces 83a and 83b of the plurality of insulating layers 82a and 82b provided with the coil conductor patterns 84a and 84b. . The frame-like conductor pattern 87B is provided on the main surface 83b of the insulating layer 82b closest to the battery pack 40 among the main surfaces 83a and 83b of the plurality of insulating layers 82a and 82b provided with the coil conductor patterns 84a and 84b. .

  By having such a configuration, also in the present embodiment, the coil element 80B, the planar conductor 11, and the ground electrode 36 are prevented from being magnetically coupled while suppressing an increase in the thickness in the stacking direction. be able to. For this reason, also in the present embodiment, substantially the same effect as in the first embodiment can be obtained.

(Embodiment 4)
FIG. 12 is an exploded perspective view of the coil element according to the present embodiment. A coil element 80C according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 12, the coil element 80 </ b> C is different in the configuration of the frame-shaped conductor pattern 87 </ b> D when compared with the coil element 80 according to the first embodiment. Other configurations are almost the same.

  The frame-shaped conductor pattern 87 is an area surrounded by the outer peripheral portion 88 through the gap between any one of the outer peripheral portion 88 surrounding the outer sides of the plurality of coil conductor patterns 84a1 to 84a4 and the plurality of coil conductor patterns 84a1 to 84a4. And a separation unit 89 for separating the components. The separation part 89 separates the plurality of coil conductor patterns 84a1 to 84a4 into two or more coil conductor pattern groups by connecting one side and the other side of the outer peripheral part 88. Note that the coil conductor pattern group includes not only a plurality of coil conductor patterns but also a pattern including only a single coil conductor pattern.

  Specifically, the separating portion 89 is provided so as to pass through a gap between the coil conductor pattern 84a3 and the coil conductor pattern 84a4, for example. Separating portion 89 connects one side and the other side of outer peripheral portion 88 to connect a plurality of coil conductor patterns 84a1 to 84a4, a first coil conductor pattern group including coil conductor patterns 84a1 to 84a3, and a coil It divides | segments into the 2nd coil conductor pattern group containing the conductor pattern 84a4.

  The separation part 89 is made of a conductive foil, and is patterned at the same time when the coil conductor patterns 84a1 to 84a4 are patterned. By forming the separation part 89, the frame-shaped conductor pattern 87 is divided into a plurality of frame-shaped conductor patterns 87C and 87D.

  FIG. 13 is a view for explaining the outer peripheral lengths of a plurality of frame-like conductor patterns formed by dividing the frame-like conductor pattern by the separation portion shown in FIG. With reference to FIG. 13, the outer peripheral lengths of a plurality of frame-like conductor patterns 87 </ b> C and 87 </ b> D formed by dividing the frame-like conductor pattern by the separating portion 89 will be described.

  As shown in FIG. 13, the frame-shaped conductor pattern 87C includes side portions 87a and separation portions 89 extending in the short direction of the insulating layer, and a pair of side portions 87b1 and 87d1 extending in the longitudinal direction of the insulating layer. Have. The outer peripheral length A1 of the frame-shaped conductor pattern 87 is the sum of the lengths L1, L5, L7, and L6 of the side portions 87a, 87b1, and 87d1 and the separating portion 89.

  The frame-shaped conductor pattern 87D has a separating portion 89 and a side portion 87c extending in the short direction of the insulating layer, and a pair of side portions 87b2 and 87d2 extending in the longitudinal direction of the insulating layer. The outer peripheral length A2 of the frame-shaped conductor pattern 87D is the sum of the lengths L8, L3, L9, and L6 of the side portions 87b2, 87c, 87d2 and the separating portion 89.

  The outer peripheral length A of the frame-shaped conductor pattern 87 is the sum of the lengths L1, L2, L3, L4 of the respective side portions constituting the frame-shaped conductor pattern 87. The length of each side is substantially the same as that of the first embodiment, and the outer peripheral length A of the frame-shaped conductor pattern 87 according to the present embodiment is the outer peripheral length A of the frame-shaped conductor pattern 87 according to the first embodiment. Is almost the same.

  Further, the outer peripheral length A1 of the frame-shaped conductor pattern 87C and the outer peripheral length A2 of the frame-shaped conductor pattern 87D are shorter than the outer peripheral length A of the frame-shaped conductor pattern 87. The outer peripheral length A2 of the frame-shaped conductor pattern 87D is shorter than the outer peripheral length of the frame-shaped conductor pattern 87C. The outer peripheral length A1 of the frame-shaped conductor pattern 87C is shorter than one wavelength (c (speed of light) / f (used frequency)) of the high frequency used, and the outer peripheral length A1 of the frame-shaped conductor pattern 87C and the frame-shaped conductor pattern 87D. The outer peripheral length A2 is also shorter than one wavelength of the high frequency used.

  FIG. 14 is a diagram showing currents flowing through the plurality of frame-like conductor patterns shown in FIG. With reference to FIG. 14, the electric current which flows into the some frame-shaped conductor pattern shown in FIG. 13 is demonstrated.

  When a magnetic field is induced by the coil 86, currents I3 and I5 flow, for example, counterclockwise in each of the plurality of frame-like conductor patterns 87C and 87D, as shown in FIG. , I6 flows.

  As described in the first embodiment, when the outer peripheral length A1 of the frame-like conductor pattern 87C and the outer peripheral length A2 of the frame-like conductor pattern 87D are shorter than one wavelength of the high frequency used, for example, counterclockwise The flowing currents I3 and I5 are larger than the currents I4 and I6 flowing clockwise. For this reason, an induced current is induced in both the frame-shaped conductor pattern 87C and the frame-shaped conductor pattern 87D.

  The outer peripheral length A1 of the frame-shaped conductor pattern 87C and the outer peripheral length A2 of the frame-shaped conductive pattern 87D are provided so as to satisfy the relationship of A1 <c / f and A2 <c / f. High frequencies having higher frequencies can be shielded.

  When viewed as the entire coil element 80C, there is a frequency band that cannot be shielded by the frame-shaped conductor pattern 87C even if the frame-shaped conductor pattern 87D can be shielded. For this reason, when the frame-shaped conductor pattern 87 is divided into one having a long outer peripheral length and one having a short outer peripheral length, a frequency band that can be shielded is determined by the one having a long outer peripheral length.

  In the present embodiment, as described above, the outer peripheral length A1 of the frame-shaped conductor pattern 87C is shorter than the outer peripheral length A of the frame-shaped conductor pattern 87 in the first embodiment, so that it is longer than the frequency band in the first embodiment. Can shield high frequency bands. As a result, in this embodiment, an effect equal to or greater than that of the first embodiment can be obtained.

(Embodiment 5)
FIG. 15 is an exploded perspective view of the coil element according to the present embodiment. A coil element 80D according to the present embodiment will be described with reference to FIG.

  As illustrated in FIG. 15, the coil element 80 </ b> D is different from the coil element 80 according to Embodiment 1 in the position of the separation unit 89. Other configurations are substantially the same.

  The separation part 89 is provided so as to pass through a gap between the coil conductor pattern 84a2 and the coil conductor pattern 84a3, for example. Separating portion 89 connects one side and the other side of outer peripheral portion 88 to connect a plurality of coil conductor patterns 84a1 to 84a4, a first coil conductor pattern group including coil conductor patterns 84a1 and 84a2, and a coil. It divides | segments into the 2nd coil conductor pattern group containing conductor pattern 84a3, 84a4.

  Even in such a case, the coil element 80D according to the present embodiment can obtain substantially the same effect as the coil element 80C according to the fourth embodiment.

  In the third embodiment described above, the case where the coil element 80D is disposed between the planar conductor 11 and the battery pack 40 is described as an example, but the present invention is not limited to this. The wiring board and the battery pack 40 may be arranged as in the second embodiment, and a coil element may be arranged between the planar conductor 11 and the ground electrode 36.

  Further, the planar conductor 11 may not be provided. In this case, the antenna device can also be configured by treating the battery pack 40 as a planar conductor and the battery pack as a planar conductor. In such a case, the frame-like conductor pattern 87 may be provided on the main surface 83b of the insulating layer 82b closest to the battery pack 40 among the main surfaces of the plurality of insulating layers provided with the coil conductor patterns. .

  As described above, when there are a plurality of embodiments, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

  Although the embodiments of the present invention have been described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

  1, 1A, 1B communication terminal device, 3A, 3B antenna, 10 housing cover, 11 planar conductor, 12 opening, 20 housing, 31, 32 wiring board, 33, 51 cable, 35A, 35B land, 36 ground electrode , 40 battery pack, 50 camera module, 61, 62 junction conductor, 70 integrated circuit, 71 capacitor, 80, 80A, 80B, 80C, 80D coil element, 81 laminated body, 82, 82a, 82b, 82c insulating layer, 83a, 83b, 83c main surface, 84c1, 84c2 external electrode, 84a, 84a1, 84a2, 84a3, 84a4, 84b coil conductor pattern, 85 interlayer connection conductor, 86 coil, 87, 87A, 87B, 87C, 87D frame-like conductor pattern, 87a , 87b, 87b1, 87b2, 87c, 87 , 87D1,87d2 side portion, 88 an outer peripheral portion, 89 separation section, 90 power supply circuit.

Claims (5)

A laminate in which a plurality of insulating layers are laminated;
A coil conductor pattern that is provided on the main surface of any one of the plurality of insulating layers and forms a part of a coil having a winding axis in a direction orthogonal to the stacking direction of the plurality of insulating layers;
And a frame-like conductor pattern provided on the same layer as the coil conductor pattern so as to surround the coil when viewed from the stacking direction.   The coil element according to claim 1, wherein the frame-shaped conductor pattern is provided on a main surface of the insulating layer provided with the coil conductor pattern. A plurality of the coil conductor patterns are provided on the main surface of the insulating layer,
The frame-shaped conductor pattern includes an outer peripheral portion that surrounds the outside of the plurality of coil conductor patterns, and a separation portion that separates a region surrounded by the outer peripheral portion through a gap between any two of the plurality of coil conductor patterns. The coil element according to claim 2, including:   The frame-shaped conductor pattern is formed so as to satisfy the relationship of A <c / f, where A is the outer peripheral length of the frame-shaped conductor pattern, f is the operating frequency, and c is the speed of light. The coil element according to any one of 1 to 3. A coil element according to any one of claims 1 to 4,
A metal body provided to overlap the coil element when viewed from the stacking direction,
The frame-shaped conductor pattern is a communication terminal device provided on a main surface closest to the metal body among a plurality of main surfaces of the insulating layer provided with the coil conductor pattern.

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