CN107591622B - Wireless communication antenna and method for manufacturing the same - Google Patents
Wireless communication antenna and method for manufacturing the same Download PDFInfo
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- CN107591622B CN107591622B CN201710068375.5A CN201710068375A CN107591622B CN 107591622 B CN107591622 B CN 107591622B CN 201710068375 A CN201710068375 A CN 201710068375A CN 107591622 B CN107591622 B CN 107591622B
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- wireless communication
- communication antenna
- metal strips
- magnetic body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
- G04G7/02—Synchronisation by radio
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R60/00—Constructional details
- G04R60/06—Antennas attached to or integrated in clock or watch bodies
- G04R60/10—Antennas attached to or integrated in clock or watch bodies inside cases
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/064—Circuit arrangements for actuating electromagnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
Abstract
The present invention relates to a wireless communication antenna and a method for manufacturing the same. A wireless communication antenna according to an embodiment of the present invention includes: a magnetic body including a plurality of metal strips stacked; an adhesive bonded to the side surfaces of the plurality of metal strips; a first substrate disposed on an upper surface of the magnetic body and including a plurality of conductive patterns; a second substrate disposed on a lower surface of the magnetic body and including a plurality of conductive patterns; and a plurality of conductive vias interconnecting the plurality of conductive patterns of the first and second substrates.
Description
Technical Field
The present invention relates to a wireless communication antenna and a method for manufacturing the same.
Background
Wireless communication is used in a variety of environments. In particular, in connection with electronic payment, a wireless communication antenna in the form of a coil may be applied to various devices.
Recently, a radio communication antenna in the form of a Spiral (helical) coil that can be attached to a cover or the like of a mobile device has been used.
Furthermore, with the generalization of wearable devices, the demand for wireless communication antennas suitable not only for mobile devices but also for wearable devices is increasing.
A wireless communication antenna employed for a wearable device needs to ensure reliability of data transmission and to satisfy requirements for radiation direction and radiation range for user convenience. Further, a wireless communication antenna mounted on a wearable device realized in a relatively small size needs to ensure mass productivity based on the small size.
In order to satisfy the characteristics of such a radio communication antenna, studies have been made on the material and structure of a magnetic material that functions as a core of the antenna.
[ Prior art documents ]
[ patent document ]
(patent document 1) Korean laid-open patent publication No. 10-2011-
Disclosure of Invention
According to an embodiment of the present invention, there is provided a wireless communication antenna including a magnetic body suitable for a wearable device and capable of improving communication performance.
An example of a wireless communication antenna for a wearable device according to the present invention includes: a magnetic body including a plurality of metal strips stacked; an adhesive bonded to the side surfaces of the plurality of metal strips; a first substrate disposed on an upper surface of the magnetic body and including a plurality of conductive patterns; a second substrate disposed on a lower surface of the magnetic body and including a plurality of conductive patterns; and a plurality of conductive vias interconnecting the plurality of conductive patterns of the first and second substrates.
Further, a method of manufacturing a wireless communication antenna according to an embodiment of the present invention includes the steps of: laminating a plurality of metal strips; bonding an adhesive to the sides of the plurality of metal strips; arranging the plurality of metal strips in a laminated manner between the first substrate and the second substrate, and extruding; forming a through hole penetrating the first substrate and the second substrate; and plating metal in the through holes to form a plurality of conductive through holes.
A wireless communication antenna according to an embodiment of the present invention has a miniaturized, thin-film solenoid coil (solenoid coil) and has improved radiation characteristics.
Drawings
Fig. 1 is a perspective view showing an example in which a wearable device performs wireless communication according to an embodiment of the present invention.
Fig. 2 is a graph showing voltages across the magnetic head adjacent to the magnetic card.
Fig. 3 is a diagram showing an example in which a magnetic head of a magnetic card reader is magnetically coupled to a wireless communication antenna according to an embodiment of the present invention.
Fig. 4 is an exploded perspective view of a wearable device according to an embodiment of the present invention.
Fig. 5 is a perspective view illustrating the inside of the rear surface of the wearable device according to an embodiment of the present invention.
Fig. 6 is a front view of a wireless communication antenna according to an embodiment of the present invention.
Fig. 7 is a rear view of a wireless communication antenna according to an embodiment of the present invention.
Fig. 8 is a cross-sectional view of a wireless communication antenna according to an embodiment of the present invention.
Fig. 9 is a cross-sectional view of a wireless communication antenna according to another embodiment of the present invention.
Fig. 10 is a cross-sectional view of a process of a method of manufacturing a wireless communication antenna according to an embodiment of the present invention.
Fig. 11 is a cross-sectional view of an extrusion process for explaining an extrusion step according to an embodiment of the present invention.
Fig. 12 and 13 are diagrams illustrating wireless communication antennas according to various embodiments of the present invention.
Description of the symbols
601: first substrate 602: second substrate
603: magnetic body 605: adhesive article
610: first wire-arranging portion 620: the second flat cable part
630: third wire arranging portion 640: the fourth flat cable part
645: through hole 650: conductive vias
660: separation region 670: contact terminal
680: filter circuit 690: reinforcing layer
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
However, the embodiment of the present invention may be modified into other various forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention by those having basic knowledge in the art. It is to be understood that the various embodiments of the invention are distinct from one another, but are not necessarily mutually exclusive.
Further, when a certain constituent element is referred to as "including" (including), if not specifically stated to the contrary, it means that another constituent element may be included without excluding the presence of another constituent element.
Fig. 1 is a perspective view showing an example in which a wearable device performs wireless communication according to an embodiment of the present invention.
The wearable device may be an electronic device that is worn on an arm, a head, or the like of a human body or fixed to a specific structure by a strap (strap) 130. Hereinafter, the wearable device of the present invention is described assuming a watch form, but is not limited thereto.
The wireless communication antenna 20 is employed for a wearable device 30. The wireless communication antenna 20 may form a magnetic field according to the control of the wearable device 30.
The wireless communication antenna 20 can operate as a transmission coil and can transmit information wirelessly in magnetic combination with a wireless signal receiving device equipped with a receiving coil.
In fig. 1, a magnetic card reader (magnetic card reader)10 is disclosed as a wireless signal receiving device equipped with a receiving coil. According to the embodiment, as the device equipped with the receiving coil, various wireless signal receiving devices can be used in addition to the magnetic card reader 10.
The wireless communication antenna 20 is magnetically coupled to the magnetic card reader 10 even when the position or angle of the receiving coil of the magnetic card reader 10 is changed by forming a widely diffused magnetic field by the transmitting coil.
In one embodiment, wireless communication antenna 20 may transmit data (e.g., card number data) to be transmitted to magnetic card reader 10 by changing the direction of the magnetic field. That is, the magnetic card reader 10 may generate the card number data by using a change in voltage across the receiving coil due to a direction change of the magnetic field formed from the wireless communication device 20.
Hereinafter, the magnetic coupling between the wireless communication antenna and the magnetic card reader and the operation of the magnetic card reader will be described in detail with reference to fig. 2 and 3.
Fig. 2 is a graph showing voltages across the magnetic head adjacent to the magnetic card.
Magnetic card reader 10 (fig. 1) includes a magnetic head 210 and an analog-to-digital converter (not shown). The Magnetic head 210 may generate a voltage by Magnetic Flux (Magnetic Flux). That is, the magnetic head 210 may include a receiving coil, and may detect a both-end voltage V generated across the receiving coil by a magnetic fieldhead。
In the case of a receiving coil present in the magnetic field, a voltage V is formed across the receiving coil by means of the magnetic fluxhead。
The resulting two-terminal voltage VheadIs supplied to an analog-to-digital converter, and the analog-to-digital converter can generate a decoding signal V from the voltage at two endsdecode. Decoding signal VdecodeMay be a digital voltage signal and may be decoded from the decoded signal VdecodeCard information data is generated.
The magnetic card has a magnetized magnetic stripe 220. As the magnetic head 210 moves over the magnetic stripe 220, a two-terminal voltage V is formed in the receiving coil of the magnetic head 210 by the magnetic fluxhead。
Voltage V acrossheadMay have a peak voltage depending on the polarity of the magnetic stripe 220. For example, in the case where the same polarities are adjacent to each other, the both-end voltage VheadA peak voltage may be induced.
In addition, the analog-to-digital converter can obtain the voltage V from two endsheadGenerating a decoded signal Vdecode. For example, the analog-to-digital converter may generate the decoding signal V by generating an edge (edge) whenever a peak voltage is detecteddecode。
Due to decoding of the signal VdecodeIs a digital voltage signal, so that digital data can be decoded therefrom. For example, it can be based on the decoded signal VdecodeLength of the period of (1) or (0)And (4) code. As an example of the illustration, the decoded signal V can be seendecodeIs twice as long as the third period. Thus, the signal V is decodeddecodeMay be decoded to '1' and the third through fifth periods may be decoded to '0'. The above decoding method is merely an example, and various decoding techniques may be adopted.
FIG. 2 shows an example of a magnetic card reader decoding from a magnetic stripe. In addition, the magnetic head 210 may generate a two-terminal voltage from a magnetic field generated by a wireless communication antenna, in addition to a magnetic stripe. That is, the magnetic head 210 of the magnetic card reader may receive data (e.g., card number data) in magnetic coupling with the transmission coil of the wireless communication antenna.
Fig. 3 is a diagram showing an example in which a magnetic head of a magnetic card reader is magnetically coupled to a wireless communication antenna according to an embodiment of the present invention.
In addition, the wireless communication antenna 310 may include a filter circuit 320 in order to remove noise from the driving signal or transform the driving signal.
Fig. 4 is an exploded perspective view of a wearable device according to an embodiment of the present invention.
Referring to fig. 4, the wearable device includes a housing, a display 420, a battery 430, a wireless communication antenna 440, and a main substrate 450.
In addition, as an example, the wearable device may include a string 460 for wearing by a user, and the housing may include a display housing 411, a battery housing 412, and a main body 413.
The display 420 may be disposed toward the front of the housing and used to visualize the electrical signals to provide visual information to the user.
Further, a touch screen panel that receives a touch input from a contact object such as a finger may be included as an example.
The battery 430 provides a power source for driving the wearable device. The battery 430 may be mounted to the battery case 412 and may be charged by a wireless power charging manner.
The wireless communication antenna 440 may form a magnetic field by receiving a driving signal from the driving signal generator 330 attached to the main substrate 450. That is, a magnetic pulse can be radiated as the transmission coil of the wireless communication antenna 440. Specifically, the wireless communication antenna 440 may have a radiation direction S along a direction perpendicular to a direction F faced by the front of the housing (i.e., a direction faced by the side of the wearable device).
Further, the transmitting coil may be magnetically combined with a wireless signal receiving device equipped with a receiving coil to transmit information wirelessly. Here, the information may be magnetic stripe (magnetic stripe) data.
Fig. 4 illustrates a case where the wireless communication antenna 440 is mounted between the main substrate 450 and the battery 430, but the mounting position of the wireless communication antenna 440 may be changed.
The wireless communication antenna 440 is described in more detail with reference to fig. 6 to 10.
The string 460 may be formed in two and connected to the body, respectively. When the string 460 is formed in an integrated manner, it may have a form surrounding the main body 413.
Fig. 5 is a perspective view illustrating the inside of the rear surface of the wearable device according to an embodiment of the present invention.
Referring to fig. 4 and 5, the wearable device may include a wireless power receiving coil 470. As an example, the wireless power receiving coil may be disposed between the rear of the main body 413 of the wearable device and the main substrate 450.
Further, the wireless power receiving coil 470 may include a shield sheet at the opposite side of the rear face receiving the wireless power. The shield sheet may be constituted by a magnetic sheet arranged on one side of the wireless power receiving coil, or may be formed by coating ferrite or conductive powder.
Such a shield sheet is provided in order to effectively form a magnetic path of wireless power and minimize the influence of a magnetic field on a battery.
The shield sheet can merely reduce the radiation range of the magnetic field formed by the wireless communication antenna 440. Thus, for the case of wearable devices employing shielding patches, wireless communication antennas incorporating solenoid coils that may have a radiation direction toward the sides of the wearable device may be more favorable for radiation characteristics than helical (helical) coils.
Fig. 6 is a front view of a wireless communication antenna according to an embodiment of the present invention; fig. 7 is a rear view of a wireless communication antenna according to an embodiment of the present invention; fig. 8 is a cross-sectional view of a wireless communication antenna according to an embodiment of the present invention; fig. 9 is a cross-sectional view of a wireless communication antenna according to another embodiment of the present invention.
Referring to fig. 6 and 7, the wireless communication antenna according to an embodiment of the present invention includes a first substrate 601, a second substrate 602, and a magnetic body 603.
The first substrate 601 includes a first line arrangement portion 610 and a second line arrangement portion 620 arranged on a first surface of the magnetic body 603. One flat line portion may be formed without a separation region 660 between the first flat line portion 610 and the second flat line portion 620, and the first flat line portion 610 and the second flat line portion 620 may be separated from each other as shown in the drawing.
In addition, the second substrate 602 includes a third line arrangement portion 630 and a fourth line arrangement portion 640 disposed on the second surface of the magnetic body 603. Here, the third and fourth line arrangement parts 630 and 640 may be formed as one line arrangement part or may be separated from each other.
The first substrate 601 and the second substrate 602 are thin film substrates, and may be flexible substrates such as FPCB. But is not limited thereto.
In addition, a plurality of conductive vias 650 for connecting the first substrate 601 and the second substrate 602 in the peripheral region of the magnetic body 603 are included.
As shown, the first to fourth bus portions 610, 620, 630, 640 include a plurality of conductive patterns. The conductive pattern constitutes a part of one turn of the coil. For example, one conductive pattern of the first line arrangement part 610 is connected with one conductive pattern of the third line arrangement part 630 through a conductive via, and one turn of the coil is completed by this connection.
As described above, the first and third bus lines 610 and 630 are connected by the plurality of conductive vias 650 to form the first coil portion as a solenoid coil.
The second bus arrangement 620 and the fourth bus arrangement 640 are connected by a plurality of conductive vias 650 to form a second coil portion as a solenoid coil.
Further, the first coil portion and the second coil portion may be arranged apart from each other with a region where no conductive pattern is formed therebetween. That is, a separation region 660 may be disposed between the first and second coil portions. Further, the first coil portion and the second coil portion may be connected in series.
The solenoid coil including the first coil portion and the second coil portion is not used as a coil in a wire form as in the related art, but is used by forming a coil pattern on a thin film substrate, so that the thickness of the thin film coil can be made very thin.
In addition, the first coil portion and the second coil portion may form two solenoid coil portions wound in the same direction, and thus, the magnetic flux passing through the magnetic body 603 may be strengthened,
the magnetic body 603 constitutes a core of the solenoid coil part, prevents eddy current, and strengthens a magnetic field formed by the solenoid coil part.
Further, a solenoid coil portion having the magnetic body 603 as a core according to an embodiment of the present invention may be attached to the wearable device to have a radiation direction toward a side of the wearable device.
A wireless communication antenna according to an embodiment of the present invention may include a contact terminal 670 and a filter circuit 680.
The contact terminal 670 is configured to electrically connect the main substrate 450 (fig. 4) and the solenoid coil portion including the first coil portion and the second coil portion. The wireless communication antenna may be applied with a driving signal through the contact terminal 670.
The filter circuit 680 may remove noise from the drive signal or may transform the drive signal.
Fig. 8 is a sectional view taken along I-I' of fig. 6. Referring to fig. 8, the wireless communication antenna includes: a first substrate 601 including a second line arrangement portion 620 formed of a conductive pattern; the second substrate includes a fourth line arrangement portion 640 formed of a conductive pattern, and the wireless communication antenna includes a magnetic body 603 between the first substrate 601 and the second substrate 602. That is, the second line arrangement portion 620 is disposed on the upper surface of the magnetic body 603, and the fourth line arrangement portion 640 is disposed on the lower surface of the magnetic body.
That is, if the magnetic body 603 is regarded as one substrate, the radio communication antenna according to the example may include a plurality of conductive patterns formed on the upper surface and the lower surface of the substrate, and a plurality of conductive vias connecting the conductive pattern formed on the upper surface and the conductive pattern formed on the lower surface.
In addition, the first substrate 601 or the second substrate 602 may be attached to the magnetic body 603 by an adhesive sheet 604. The adhesive sheet 604 may be formed of an adhesive tape, or may be formed by applying an adhesive or a resin having adhesive properties to the surfaces of the first substrate 601 and the second substrate 602 or the magnetic body 603.
The conductive via 650 connects the second line arrangement portion 620 and the fourth line arrangement portion 640 to form a solenoid-shaped coil surrounding the magnetic body 603 together with the second line arrangement portion 620 and the fourth line arrangement portion 640.
As shown in the drawing, one conductive pattern on the first substrate 601 and one conductive pattern on the second substrate 602 are connected by two conductive vias 650, so that disconnection between the conductive patterns can be prevented.
The magnetic body 603 is formed by stacking a plurality of metal strips 603a, 603b, and 603 c. In the embodiment of the present invention, the case where three metal strips are laminated is illustrated, but the number of the laminated metal strips may be changed.
The plurality of metal strips 603a, 603b, and 603c are obtained by pressure molding or pressure-and-sintering a powder magnetic material. The plurality of metal strips are soft magnetic (soft magnetic) and may be thin metal strips having an amorphous (amorphous) structure or a nanocrystalline structure. Alternatively, the plurality of metal strips may be composed of permalloy (permalloy) which is a high permeability substance.
As the alloy having the amorphous structure, an Fe-based or Co-based magnetic alloy can be used. For example, Fe-Si-B alloy can be used as the Fe-based magnetic alloy, and the saturation magnetic flux density is higher as the content of the metal including Fe is higher, but if the content of Fe element is too large, the Fe content is 70 to 90 atomic% because it is difficult to form amorphous, and the amorphous forming ability of the alloy is most excellent when the sum of Si and B is in the range of 10 to 30 atomic%. In order to prevent corrosion, corrosion resistance elements such as Cr and Co may be added to the above basic composition in an amount of up to 20 atomic%, and other properties may be imparted by including a small amount of other metals as required.
The metal strip having the nanocrystal structure may use a Fe-based nanocrystalline particle magnetic alloy. As the Fe-based nanocrystalline particle alloy, an Fe-Si-B-Cu-Nb alloy can be used.
The Fe-based nanocrystalline particle alloy may have a permeability of 20,000 before heat treatment and a permeability of 100,000 after heat treatment.
Or the plurality of metal strips may be constructed of a semi-hard magnetic material (semi-hard magnetic). For example, the semi-hard magnetic material may be an Fe-based alloy, and Ni may be included in a range of 13 to 17%. In this case, the Coercivity (Coercivity) of the plurality of metal strips may be in a range of 1.5 to 3(kA/m), and the remanence (reference) may be in a range of 1.3 to 1.6 (T).
Between the metal strips, an adhesive layer is arranged between the joining surfaces of the metal strips for joining the metal strips. The adhesive layer may be formed by coating an adhesive sheet, an adhesive, or a resin having adhesiveness.
In addition, since the magnetic resistance decreases as the sectional area of the magnetic body 603 increases, the inductance of the wireless communication antenna increases. That is, the inductance increases as the number of the metal strips stacked increases. Furthermore, as the inductance increases, the radiation performance of the wireless communication antenna may be improved. However, since the thickness of the magnetic material 603 is limited due to the limitation of the mounting space, it is necessary to make the magnetic material thin.
The wireless communication antenna according to an embodiment of the present invention includes an adhesive 605 adhered to a side 603s of at least a part of the plurality of metal strips 603a, 603b, 603 c.
The adhesive 605 may adhere to the sides of the plurality of metal strips to secure the plurality of metal strips to each other. Thus, the adhesive 605 may replace an adhesive layer disposed on the lamination surface to which the plurality of metal strips are joined.
The adhesive 605 may be a hot melt adhesive (hotmelt) applied in a molten state to the sides of the plurality of metal strips.
Specifically, the hot melt adhesive may be a mixture containing one or more of Ethylene Vinyl Acetate (EVA), polyurethane (polyurethane), polyimide (polyimide), and rubber (rubber). The hot melt adhesive containing polyurethane reacts with moisture to be hardened, and thus corrosion of the metal strip can be prevented. In addition, a hot melt adhesive comprising rubber may enhance the flexibility of the wireless communication antenna.
Alternatively, the adhesive 605 may be a film having adhesiveness on one side or both sides, and the film thickness may have a thickness of 10 μm to 100 μm.
The adhesive 605 fixes the plurality of metal strips, and may be bonded to the first substrate 601 and the second substrate 602, and the adhesive 605 may reinforce the bonding interface between the first substrate 601 and the second substrate 602. That is, since the adhesive 605 fills the empty space around the magnetic body 603 and adheres to the first substrate 601 and the second substrate 602, defects such as disconnection and inflow of air bubbles occurring in the process can be prevented.
The magnetic body 603 using such an adhesive 605 can be made thin by omitting the adhesive layer. Alternatively, a greater number of metal strips may be stacked at the same thickness.
Fig. 9 is a cross-sectional view of the wireless communication antenna further including a reinforcing layer 690 in the example of the wireless communication antenna of fig. 8.
Referring to fig. 9, the wireless communication antenna may include a reinforcing layer 690, and the reinforcing layer 690 may be made of a thermosetting resin having insulation and adhesion properties.
The stiffening layer 690 may be disposed between the first substrate 601 and the second substrate 602 at the outer periphery of the magnetic body 603. That is, as shown in fig. 9, the reinforcing layer 690 may be disposed at a side portion of the magnetic body 603. In addition, the stiffening layer 690 may be disposed so as to surround the outer edge of the magnetic body 603 in the plan view of fig. 6.
The reinforcing layer 690 can prevent process defects together with the adhesive 605.
In addition, the conductive via 650 may be formed to penetrate the stiffening layer 690.
The constitution and materials of the wireless communication antenna other than these can be understood by the embodiment of the wireless communication antenna described above with reference to fig. 8, and thus a detailed explanation is omitted.
Fig. 10 is a cross-sectional view of a process of a method of manufacturing a wireless communication antenna according to an embodiment of the present invention.
As shown in fig. 10 (a), the magnetic body 603 is formed by stacking a plurality of metal strips 603a, 603b, and 603 c. The plurality of metal strips may be made of a Fe-Si-B-Nb-Cu based nanocrystalline alloy material and may be cut according to the form of the magnetic body 603.
Then, as shown in fig. 10 (b), an adhesive 605 is bonded to the side surfaces of the plurality of metal strips 603a, 603b, and 603 c. Specifically, the adhesive 605 may be a hot melt adhesive. When heat is applied, the hot melt adhesive becomes a molten state and can be coated in the molten state. The hot melt adhesive may be a mixture containing one or more of ethylene vinyl acetate, polyurethane, polyimide, and rubber.
Then, as shown in fig. 10 (c), the magnetic body 603 is disposed between the first substrate 601 and the second substrate 602. The first substrate 601 and the second substrate 602 have the bus lines 620 and 640 on the outer surfaces (i.e., the other surfaces of the surfaces to be bonded to the magnetic bodies).
Then, as shown in fig. 10 (d), the first substrate 601 and the second substrate 602 are pressed. At this time, the first substrate 601 and the second substrate 602 may be attached to the magnetic body 603 by the adhesive sheet 604.
The adhesive 605 may be bonded to the first substrate 601 and the second substrate 602 in a molten state, and the adhesive 605 may reinforce the bonding interface between the first substrate 601 and the second substrate 602. That is, since the adhesive 605 can fill the empty space around the magnetic body 603, defects such as disconnection and inflow of air bubbles due to a process can be prevented.
Then, as shown in fig. 10 (e), a through hole 645 is formed to penetrate the first substrate and the second substrate. Thereafter, as shown in fig. 10 (f), a plurality of conductive through holes 650 may be formed by plating metal to the inside of the through holes 645.
Fig. 11 shows another embodiment of the steps described above with reference to fig. 10 (c) and 10 (d).
As shown in fig. 11 (a), a plurality of metal strips stacked are arranged between a first substrate 601 and a second substrate 602. Thereafter, as shown in fig. 11 (b), the reinforcing layer 690 is disposed between the first substrate 601 and the second substrate 602 at the outer periphery of the magnetic body 603. Thereafter, as shown in fig. 11 (c), the first substrate 601 and the second substrate 602 are pressed.
Accordingly, the reinforcing layer 690 and the adhesive 605' adhered to the reinforcing layer 690 can fill the empty space around the magnetic substance 603 between the first substrate 601 and the second substrate 602, and thus defects such as disconnection and inflow of bubbles occurring in the process can be prevented.
Fig. 12 and 13 are diagrams illustrating wireless communication antennas according to various embodiments of the present invention. Although fig. 12 and 13 show front views, the following description is equally applicable to the rear surface of the wireless communication antenna. The examples of the wireless communication antenna described with reference to fig. 12 and 13 are not necessarily mutually exclusive from the examples of the wireless communication antenna of fig. 6 to 9. Therefore, a description overlapping with the description for the above-described wireless communication antenna will be omitted.
Referring to fig. 12, a substrate 1001 of a wireless communication antenna according to an embodiment of the present invention may have a form that can be easily attached to a wearable device.
For example, the substrate 901 may have a circular, elliptical, polygonal shape, and may have a portion at least partially recessed or protruding. Further, a contact terminal 970 for achieving electrical connection of the coil part and the main substrate 450 (fig. 4) may be arranged at one end of the lead-out portion 971 protruding from the substrate 901.
The magnetic material 903 functioning as a core of the solenoid coil portion may have a protruding portion E extending toward both ends of the solenoid coil portion.
The shape of the magnetic body 903 may be variously modified depending on the shape of the substrate 901 or the length and arrangement of the plurality of conductive patterns. That is, it may have a circular, elliptical, polygonal shape, and may have at least a portion of a concave or convex portion.
According to the change in the form of the magnetic body 903, the radiation direction and the radiation range of the magnetic field radiated from the solenoid coil can be adjusted.
Referring to fig. 13, the wireless communication antenna according to an embodiment of the present invention includes a coil portion, and the coil portion may include a plurality of conductive patterns of various lengths according to the shape of the first substrate 1001.
For example, as shown in fig. 13, the plurality of conductive patterns may be formed in a form in which patterns having lengths increased or decreased while constituting a chord (chord) of a circle are arranged.
Further, the shape of the magnetic body 1003 functioning as the cores of the two solenoid coil portions may have a shape expanding to the edge position of the first substrate 1001.
In addition, a plurality of conductive vias 1050 may be formed along a region adjacent to an edge position of the first substrate 1001 at the outer contour of the magnetic body 1003.
Further, the two solenoid coil portions may have different numbers of conductive patterns from each other, and the arrangement of the separation region between the two solenoid coil portions in which the conductive patterns are not formed may be changed.
The present invention described above is not limited to the above-described embodiments and the accompanying drawings, but is defined by the scope of the claims, and those having a basic knowledge in the art will readily understand that various changes and modifications can be made in the constitution of the present invention without departing from the scope of the technical idea of the present invention.
Claims (12)
1. A wireless communication antenna, comprising:
a magnetic body including a plurality of metal strips stacked;
an adhesive bonded to the side surfaces of the plurality of metal strips;
a first substrate disposed on an upper surface of the magnetic body and including a plurality of conductive patterns;
a second substrate disposed on a lower surface of the magnetic body and including a plurality of conductive patterns; and
a plurality of conductive vias interconnecting the plurality of conductive patterns of the first and second substrates and spaced apart from the magnetic body,
wherein the plurality of electric patterns of the first substrate and the plurality of electric patterns of the second substrate are connected through the conductive through-holes, respectively, to form a solenoid coil equipped with the magnetic body as a core.
2. The wireless communication antenna of claim 1,
the plurality of metal strips are made of Fe-Si-B-Nb-Cu nanocrystalline alloy.
3. The wireless communication antenna of claim 1, further comprising:
and a reinforcing layer disposed between the first substrate and the second substrate at an outer periphery of the magnetic body.
4. The wireless communication antenna of claim 1,
the adhesive is a hot melt adhesive applied in a molten state to the sides of the plurality of metal strips.
5. The wireless communication antenna of claim 4,
the hot melt adhesive fixes the plurality of metal strips and bonds the metal strips to the first substrate and the second substrate.
6. The wireless communication antenna of claim 4,
the hot melt adhesive is a mixture containing at least one of ethylene vinyl acetate, polyurethane, polyimide, and rubber.
7. The wireless communication antenna of claim 1,
the adhesive is a film having adhesiveness on one surface or both surfaces.
8. A method of manufacturing a wireless communication antenna, comprising the steps of:
laminating a plurality of metal strips;
bonding an adhesive to the sides of the plurality of metal strips;
arranging the plurality of metal strips in a laminated manner between the first substrate and the second substrate, and extruding;
forming a through hole penetrating the first substrate and the second substrate;
plating metal inside the through holes to form a plurality of conductive through holes,
wherein the first substrate and the second substrate comprise a plurality of conductive patterns,
the plurality of conductive vias interconnecting the plurality of conductive patterns of the first substrate and the second substrate and being spaced apart from the plurality of metal strips,
the plurality of electric patterns of the first substrate and the plurality of electric patterns of the second substrate are connected through the conductive through holes, respectively, to form a solenoid coil equipped with the plurality of metal strips as cores.
9. The method of manufacturing a wireless communication antenna according to claim 8,
the plurality of metal strips are made of Fe-Si-B-Nb-Cu nanocrystalline alloy.
10. The method of manufacturing a wireless communication antenna according to claim 8,
the step of extruding comprises the steps of:
disposing the plurality of metal strips in a stack between the first substrate and the second substrate;
disposing a stiffening layer between the first substrate and the second substrate at an outline of the plurality of metal strips;
and extruding the first substrate and the second substrate.
11. The method of manufacturing a wireless communication antenna according to claim 8,
the bonding step is a step of applying a hot melt adhesive in a molten state to the side surfaces of the plurality of metal strips for bonding.
12. The method of manufacturing a wireless communication antenna according to claim 11,
the hot melt adhesive is a mixture containing at least one of ethylene vinyl acetate, polyurethane, polyimide, and rubber.
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| KR1020160086696A KR102480127B1 (en) | 2016-07-08 | 2016-07-08 | Wireless communication antenna and fabrication method thereof |
| KR10-2016-0086696 | 2016-07-08 |
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| CN107591622A (en) | 2018-01-16 |
| KR102480127B1 (en) | 2022-12-22 |
| KR20180006072A (en) | 2018-01-17 |
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