KR20130098019A - Ferrite substrate for antenna, antenna module and the manufacturing method of the same - Google Patents

Abstract

PURPOSE: A ferrite substrate for an antenna, an antenna module, and a manufacturing method thereof improve the transmission and reception characteristics of the antenna by connecting multiple small ferrite substrates in parallel to increase the area of the substrate. CONSTITUTION: An antenna module (100) includes a ferrite substrate (120) and a PCB substrate (140) attached to each other by an adhesive member (130). The ferrite substrate is composed of at least two unit ferrite substrates. Multiple cutting-plane lines are formed in a certain direction on the surface of the unit ferrite substrate. When the unit substrates are laminated, the cutting lines cross each other. The adhesive member is composed of a sheet and adhesive materials coated on the sheet. Ferrite components and metal magnetic substance components are added to the adhesive materials coated on one side of the sheet.

Description

Ferrite substrate for antenna, antenna module and the manufacturing method of the same

The present invention relates to an antenna ferrite substrate, an antenna module, and a method of manufacturing the same, and more particularly, by arranging a plurality of ferrite substrates to operate as a single substrate to enable a large area of a ferrite substrate having a limited large area. In addition, the ferrite powder is added to the adhesive member used in the bonding of the ferrite substrate and the PCB substrate, so that the magnetic properties are continuous between the ferrite substrate and the PCB substrate, thereby improving the communication quality of the antenna.

Near Field Communication (NFC) is an electronic tag (RFID), a non-contact short-range wireless communication module using a 13.56Mz frequency band refers to a technology for transmitting data between terminals at a close distance of 10 cm. In addition to billing, NFC is used extensively in supermarkets and general stores for transporting travel information for goods information and visitors, as well as traffic and access control locks.

The feature of NFC is that it is extended from existing RFID, and the terminal with the built-in tag can be operated in active mode, so it can not only function as a tag, but also read the tag and input information into the tag. It also functions as a writer and enables P2P between terminals, and ISO 18092, the international standard for NFC, is ISO 14443, the international standard for contactless smart cards, Felica of Sony, and MiFare of Philips. Also compatible with.

NFC is a core component of the ferrite substrate for the antenna module, such a ferrite substrate can solve the problem that the communication distance is reduced by the loss due to the generation of eddy current of the metal, from which can increase the communication distance of NFC Has an advantage.

The conventional method for manufacturing a ferrite substrate for an antenna module is as follows.

First, a slurry for preparing a ferrite green sheet is prepared, and the slurry is mixed with a ball mill or a basket mill by adding PVB or an acrylic crab binder, a plasticizer, a solvent, and the like to the ferrite powder. Then, using the mixture to produce a ferrite green sheet through a doctor blade process or coma roll process. Thereafter, the green sheet manufactured as described above is laminated with one or more green sheets in consideration of the planar shrinkage rate and the contracted thickness after firing the ferrite green sheet. Thereafter, the stacked green sheets are cut into a plurality of unit ferrite green sheets. At this time, two methods of complete cutting and partial cutting may be applied when cutting. The complete cutting refers to cutting the ferrite green sheet so that a plurality of unit ferrite green sheets become independent objects, and the partial cutting means the thickness of the green sheet. It means to cut partly like cutting only a part of thickness in the direction. At this time, the unit ferrite substrate is cut to have a side length of about 2mm to 5mm, it is preferable to make a partial cut. Subsequently, the sintered ferrite green sheet is calcined according to the firing temperature conditions to complete the sintered ferrite substrate.

As described above, when the ferrite substrate is manufactured, the following problem occurs.

First, the ferrite substrate is a ceramic material, and according to the stress generated during molding, problems such as warpage may occur during the firing process, and thus, a large area may be very difficult.

In addition, the ferrite substrate is bonded using a PCB circuit and an adhesive to control the operation thereof, there is also a problem that the communication quality is reduced by the gain is reduced in the bonding portion as a result of the bonding.

In addition, a ferrite substrate is usually manufactured by a method of laminating a plurality of substrates, and the process of applying cutting lines as described above is performed after laminating the substrates, in which the cutting equipment generating the cutting lines is very finely adjusted. Should be. In other words, in order to determine the depth that the cutting line has in the thickness direction of the substrate, a high degree of operation of cutting equipment is required. To this end, the cutting equipment becomes complicated and there is a problem in that an error is more likely to occur in the operation of the cutting equipment. .

In addition, when the cutting line is applied to the substrate, the horizontal cutting line and the vertical cutting line, which are usually perpendicular to each other, are simultaneously applied to one substrate. For example, the horizontal cutting line is first applied, and then the vertical cutting line is applied. In this case, there is a problem in that the cutting depth of the horizontal cutting line is changed by the provision of the vertical cutting line, and thus the cutting is not uniform. In addition, when the equipment is configured such that the horizontal cutting line and the vertical cutting line are simultaneously provided, the equipment becomes complicated and the manufacturing cost increases, resulting in an increase in the production cost of the ferrite substrate.

The present invention has been made to solve the above-described problems, the present invention, in the use of a substrate made of a ceramic material, such as a ferrite substrate having a large area limit, by connecting a plurality of small-scale ferrite substrates in mass production level in parallel It is an object of the present invention to manufacture a large-area antenna module by allowing a large area to be used.

In addition, the present invention, when the ferrite substrate for the antenna module is bonded to the PCB substrate through the adhesive member, by introducing a ferrite substrate and the same material to the adhesive member, the antenna by improving the magnetic connection between the ferrite substrate and the PCB substrate It is another object to improve the transmission / reception characteristics of the antenna.

In addition, the present invention is provided with at least one cutting line having a direction so as to be divided into a plurality of unit ferrite substrate to the ferrite substrate, by cutting the cutting line of the unit ferrite substrate to which each cutting line is given so as to cross each other, cutting equipment It is another object to improve the productivity by simplifying the structure of the.

In addition, by performing the cutting line applying process first of the lamination process and the cutting line granting process, the depth of the cutting line of the ferrite green sheet to which the cutting line is once given in the lamination process can be easily changed by the lamination pressure, thereby providing the precision of cutting. Another aim is to simplify the process and to eliminate the complexity inherent in the process.

In order to achieve the above object, the present invention provides an antenna module including a ferrite substrate and a PCB substrate bonded to each other via an adhesive member, wherein the adhesive member is composed of a sheet and an adhesive material applied to the sheet. At least one ferrite component or a magnetic metal component is provided in the adhesive material applied to at least one surface of the sheet.

The ferrite substrate is formed by stacking at least two unit ferrite substrates, and each of the two unit ferrite substrates has a plurality of cutting lines in a predetermined direction on a surface thereof, and is preferably laminated so that the directions of the cutting lines cross each other. Do.

The two stacked unit ferrite substrates are stacked in a direction in which cutting lines face each other, and the cutting lines are partial cutting lines partially cut in the thickness direction of the substrate.

The depth at which the cut line is formed is preferably 10 to 100, based on 100 of the unit ferrite substrate.

It is preferable that the plurality of antenna modules are connected in parallel to form a large area antenna module.

In addition, the present invention comprises the steps of arranging a plurality of ferrite substrates adjacent; Adhering an adhesive member on the plurality of arranged ferrite substrates, wherein the adhesive member includes a ferrite component or a magnetic metal component. .

Arranging the plurality of ferrite substrates to be adjacent to each other; Previously, cutting to form a cutting line in one direction on the unit ferrite substrate; And stacking at least two of the unit ferrite substrates in a direction in which the cutting lines cross each other, thereby manufacturing a ferrite substrate.

The two stacked unit ferrite substrates are stacked in a direction in which cutting lines face each other, and the cutting lines are partial cutting lines partially cut in the thickness direction of the substrate.

According to the present invention as described above, by using a substrate made of a ceramic material, such as a ferrite substrate that has a limited large area, by connecting a plurality of small-scale ferrite substrates of mass production level can be connected in parallel to enable a substantially large area, It is expected that the effect of producing a practical and practical antenna module of the area is expected.

In addition, when the ferrite substrate for the antenna module is bonded to the PCB substrate through the adhesive member, the ferrite substrate and components of the same material are introduced into the adhesive member to maintain the connection gain between the ferrite substrate and the PCB substrate to maximize the transmission and reception of the antenna. The effect of improving the properties is expected.

In addition, at least one cutting line having directionality is provided to the ferrite substrate so as to be divided into a plurality of unit ferrite substrates, and the cutting lines of the unit ferrite substrates to which each cutting line is applied are laminated so as to intersect with each other, thereby generating on one substrate. The ferrite substrates laminated by guiding the cutting direction of the other substrate on which the cut lines are stacked may have the same effect as if each has all the crossing lines. From this, it is possible to implement the structure simplification of the cutting equipment, and thus the effect of improving the productivity and reducing the production cost is expected.

In addition, by performing the cutting line applying process first during the lamination process and the cutting line granting process, the depth of the cutting line of the ferrite green sheet to which the cutting line is once given in the lamination process can be easily changed by the lamination pressure, thereby creating the precision of the cutting line. It is expected that the effect of removing various complexities such as the complexity of the process and the complexity of the equipment caused by the granting process is expected.

1 is an exploded perspective view of an antenna module including a ferrite substrate and an adhesive member according to an embodiment of the present invention.
2 is an exploded perspective view showing a parallel connection state of a plurality of ferrite substrates for the large area of the ferrite substrate according to an embodiment of the present invention.
3 is an exploded perspective view before coupling of a substrate to which a horizontal cutting line and a vertical cutting line of a ferrite substrate according to an exemplary embodiment of the present invention are applied.
4 is an exploded perspective view before coupling of a substrate to which a horizontal cutting line and a vertical cutting line of a ferrite substrate according to another embodiment of the present invention are applied.
5 is a cross-sectional view showing that the ferrite powder is added to the adhesive member connecting the ferrite substrate and the PCB substrate 140 according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments and the accompanying drawings.

1 is an exploded perspective view of an antenna module 100 including a ferrite substrate 120 and an adhesive member 130 according to an embodiment of the present invention. As shown, the antenna module 100 according to the present invention is a cover 110 at the top layer, a ferrite substrate 120 at the bottom, the adhesive member 130 at the bottom, PCB substrate 140 at the bottom ), An adhesive member 130 at a lower portion thereof, and a protective paper 131 protecting the surface of the adhesive member 130 at a lower portion thereof.

The invention here has two main features.

One is a parallel connection method of a plurality of ferrite substrate 120 as configured in FIG. As described above, the ferrite substrate 120 has a problem of the stress generated during the molding process and the deformation caused by the stress during the firing process, so that the ferrite substrate 120 having a small area is easy to manufacture, but has a large area The more difficult local stress control is, the more easily deformation occurs.

On the other hand, the large area of the substrate is a situation that the PCB (FPCB) used in the manufacture of the antenna is increasing in size to the large size and advantageous in mass production and low price is increasing the demand for the large size of the substrate, the ferrite substrate 120 Since control of process variables during molding and firing is very difficult, certain limitations arise in the large area of the substrate.

Therefore, the present invention has been conceived in that it is simple and economical to pursue large area using parallel connection between existing manufactured substrates rather than pursuing such large area.

That is, one of the features of the present invention is characterized in that the plurality of ferrite substrate 120 is connected in parallel via the adhesive member 130, which is the parallel connection of the ferrite substrate 120 is the antenna module 100 Applicants attempted to break the preconceived notion that there would be limitations in the function implementation as 0) and found that there was no problem in operating as the antenna module 100.

In addition, the second main feature of the present invention is the configuration of the adhesive member 130 for connecting both substrates between the ferrite substrate 120 and the PCB substrate 140. This is shown as a cross-sectional view of a portion of antenna module 100 0 in FIG. 5.

The adhesive member 130 is typically used as a double-sided tape, the double-sided tape is coated with an adhesive material 133 on both sides. Such an adhesive material 133 and the double-sided tape may be an obstacle to the conductive connection between the PCB substrate 140 and the ferrite substrate 120 as an insulating material, and in the case where a fine communication sensitivity is required, such obstacles are not many. It can be recognized as a problem.

Accordingly, in the present invention, the ferrite component of the same material as the ferrite substrate 120 is mixed with the adhesive material 133 in a fine powder form, for example, and then applied to the adhesive member 130. The continuity due to the ferrite material is provided between the PCB substrate 140. Thereby, the communication characteristic of an antenna can be improved significantly.

In other words, the adhesive member 130 is composed of a sheet and an adhesive material 133 applied to both sides of the sheet, it characterized in that the ferrite component is applied to at least one surface of the adhesive material 133.

Meanwhile, the detailed features of the present invention are as shown in FIG.

In FIG. 3, the laminated cut line 121 and the vertical cut line 121 face each other (a), and the horizontal cut line 121 and the vertical cut line 121 are stacked. In Fig. 4, the laminates (b) are laminated so that they do not face each other. Respectively.

In the case of FIG. 3A, it is easier to adjust the depth corresponding to the substrate thickness direction of the cutting line 121 according to the stacking pressure, and FIGS. 3A, 4A, In the case of (b), it is impossible to do the cutting process before lamination. The present invention has an advantage that the stacking direction can be diversified by applying the cutting line 121 before the stacking. That is, when the cutting line 121 is provided after the lamination, for example, the cutting line 121 in the horizontal direction and the cutting line 121 in the vertical direction are not necessarily provided on one ferrite substrate 120. Since it must be, the process of applying the cutting line 121 before lamination will be significant in itself.

Here, the cutting line 121 is an example of a partial cutting line, not a complete cutting. However, the cutting line 121 is not to be excluded, and in the case of a complete cutting, each unit ferrite substrate 125 after the cutting is scattered. To prevent it, it should be fixed firmly to an adhesive tape and then cut. At this time, care should be taken that the adhesive tape or the like is not cut together with the ferrite substrate 120.

Here, the substrate is provided with at least one or more cutting lines 121 in a single direction, and as long as the cutting lines 121 are defined in one direction, the cutting lines 121 intersecting with the cutting lines 121 are further attached to the same substrate. It is not provided, it is preferable to laminate the substrate stage in which the cutting line 121 in a single direction is provided.

For example, as shown in FIG. 3, the cutting lines 121 are stacked in the horizontal direction and the ferrite substrates 120 in the vertical direction, and the cutting lines 121 in the horizontal and vertical directions are thus stacked. If they intersect, they will be at right angles to each other. In the present invention, the intersection of the cutting lines 121 as described above is not limited only to the vertical relationship as described above, and the crossing angle may be variously implemented.

When the cutting line 121 is provided in this way, the ferrite substrate 120 maintains a fluid state (flexible), and thus is very easy to handle, and is separated by the cutting of the ferrite substrate 120 When the cell is referred to as the unit ferrite substrate 125, it is very convenient to configure the antenna module 100 using the unit ferrite substrate 125.

However, in order to avoid the complexity in providing the cutting line 121 in both directions (horizontal direction and vertical direction) and to simplify the process, in the present invention, a plurality of substrates having a plurality of intersecting cutting lines 121 are laminated. will be.

Here, the cutting line 121 is a partial cutting line in which only part is cut in the thickness direction of the substrate, or otherwise, the cutting line 121 is divided into complete cutting lines, which are cutting lines 121 having the same depth as the thickness direction of the substrate.

The depth at which the cutting line 121 is formed is preferably 10 to 100 when the thickness of the unit ferrite substrate 125 is set to 100. If the depth is less than 10, the flexibility of the substrate cannot be secured. It is good to have the above value.

Hereinafter, a method of manufacturing the ferrite substrate 120 for the antenna module 100 of the present invention. The manufacturing process of the antenna module 100 may be interpreted as having the characteristics of the invention at the same time by the manufacturing process of the ferrite substrate 120.

The present invention comprises the steps of arranging the plurality of ferrite substrates 120 adjacent; Adhering the adhesive member 130 on the arranged plurality of ferrite substrates 120; wherein the adhesive member 130 includes a ferrite component. Provided is a method of manufacturing the ferrite substrate 120. In this case, the ferrite component is preferably, for example, ferrite powder 135. On the other hand, there may be a metal magnetic powder in place of the ferrite powder 135, and a metal magnetic body to be used in this case include a sendust (sendust), permalloy (MPP), pure iron.

Meanwhile, before the arranging the plurality of ferrite substrates 120 to be adjacent to each other, cutting the ferrite substrate 120 such that one cutting line 121 is formed in one direction; Stacking at least two substrates of the ferrite substrate 120 in a direction in which the cutting lines 121 cross each other to manufacture the ferrite substrate 120, which is preferably described above. same.

The stacked two unit ferrite substrates 120 are stacked in a direction in which the cutting lines 121 face each other, and the cutting lines 121 are partially cut lines 121 partially cut in the thickness direction of the substrate. It is advantageous. This is to facilitate the handling of the ferrite substrate 120, and to enable the depth control of the cutting line 121.

Applying the present invention as described above can easily manufacture the antenna module 100 having a large area of the substrate, can facilitate the process of applying the cutting line 121 to the ferrite substrate 120, cutting The equipment can be simplified and the depth control of the cutting line 121 can be facilitated.

100: antenna module 110: cover paper
120: ferrite substrate 121: unit ferrite substrate
125: cutting line 130: adhesive member
131: protective paper 133: adhesive material
135 ferrite powder 140 PCB substrate 140

Claims (8)

In the antenna module comprising a ferrite substrate and a PCB substrate bonded to each other via an adhesive member,
The adhesive member is composed of a sheet and an adhesive material applied to the sheet, the antenna module, characterized in that the adhesive material applied to at least one surface of the sheet further comprises a ferrite component or a magnetic metal component. The method of claim 1,
The ferrite substrate is formed by stacking at least two unit ferrite substrates, and each of the two unit ferrite substrates has a plurality of cutting lines in a predetermined direction on a surface thereof, and is laminated so that the directions of the cutting lines cross each other when stacked. Antenna module. 3. The method of claim 2,
The stacked two unit ferrite substrates are stacked in the direction in which the cutting lines face each other, wherein the cutting line is a partial cutting line cut only partly in the thickness direction of the substrate. 3. The method of claim 2,
The depth of the cutting line is formed, the antenna module, characterized in that 10 to 100, based on the thickness of the unit ferrite substrate 100. 3. The method according to claim 1 or 2,
And at least two antenna modules connected in parallel on the same plane to form a large area antenna module. Arranging the plurality of ferrite substrates to be adjacent;
Adhering an adhesive member on the arranged plurality of ferrite substrates;
It is configured to include, wherein the adhesive member is a method of manufacturing a ferrite substrate for an antenna module, characterized in that the ferrite component or a magnetic metal component is contained. The method according to claim 6,
Arranging the plurality of ferrite substrates to be adjacent to each other; Before,
Cutting to form a cutting line in one direction on the unit ferrite substrate;
Manufacturing a ferrite substrate by stacking at least two substrates of the unit ferrite substrates in a direction in which cutting lines cross each other;
Method of manufacturing a ferrite substrate for an antenna module, characterized in that it further comprises. The method of claim 7, wherein
The stacked two unit ferrite substrates are stacked in the direction in which the cutting lines face each other, the cutting line is a manufacturing method of the ferrite substrate for the antenna module, characterized in that the partial cutting line cut only partly in the thickness direction of the substrate.

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