KR100862890B1 - RF antenna circuit device and RF card including same - Google Patents

Abstract

The present invention relates to a radio frequency identification (RFID) antenna circuit device and an RFID card including the same. The present invention has a starting point on one side of a surface of a substrate and is wound in an outer direction of the substrate or wound inward of the substrate. Including a loop-shaped coil, including a loop antenna having an end point in the region adjacent to the start point and an RFID chip provided on the loop antenna and electrically connected to the start point and the end point and mounted to overlap the coil. By forming an antenna device, the present invention relates to an invention for improving the transmission and reception efficiency of an RFID card and increasing the manufacturing process yield.

Description

Rfid antenna circuit device and rfid card including same {RFID Antenna Circuit Device and RFID Card With The Same}

The present invention relates to an RFID antenna circuit device having an antenna circuit for transmitting or receiving radio frequency. More particularly, the present invention relates to a method for transmitting and receiving an electronic card including an improved method for connecting both terminals of an antenna circuit. The present invention relates to a technique capable of improving the efficiency and increasing the manufacturing process yield.

Recently, technology using radio frequency (RF) has been widely used not only in communication technology but also in all industries including distribution. Radio frequency technology is used not only in radar devices but also in technical fields such as safety devices such as vehicle collision avoidance systems, smart cards and radio frequency identification (RFID) devices. Among them, wireless recognition technology has been introduced as a basis for realizing the development of electronic commerce due to the rapid development of information technology. For example, the use of radio frequency systems is expanding in that the overall flow of goods such as location tracking and inventory management can be grasped to more effectively complete the production and sale of goods. In order to implement this radio frequency technology, a radio frequency system includes components such as an antenna, a transponder and a reader. As in other technical fields, each component is compacted to meet the needs of light weight, miniaturization and thinning.

An antenna is a passive device capable of transmitting or receiving electromagnetic wave signals according to the principle of electromagnetic induction in an electromagnetic field. In order to efficiently transmit and receive signals while satisfying the requirements of a small thin film in a smart card, a mobile phone, and a wireless tag, Loop antennas, preferably loop antennas in the form of printed circuit boards, are used among the various types of loop antennas. A loop antenna in the form of a printed circuit board is a circuit obtained by etching a metal film formed on a substrate which is a thin film of polyethylene terephthalate resin (PET). Such circuits are problematic in how to connect integrated circuit chips.

1 is a schematic diagram showing an antenna circuit device according to the prior art.

Referring to FIG. 1, a loop antenna 40 is wired on a substrate 30.

Here, the loop antenna 40 is formed on the substrate 30 made of polyethylene terephthalate resin (PET) using a method such as an etching method or a printing method. The loop antenna 40 is typically made in the form of a spiral so that a longer circuit can be formed in a limited space of the substrate 30.

Next, the first connecting terminal 41 is provided at the outer end of the loop antenna 40, and the second connecting terminal 45 is formed at the inner end thereof, respectively.

Next, the first and second terminals 41, 45 of the loop antenna 40 must be connected to the anodes of the integrated circuit chip 42, respectively.

In this case, since most of the loop antenna circuit devices currently used are integrated circuit chips 42 provided inside the loop antenna 40, in order to connect the first connection terminal 41 to the inside of the loop antenna 40. The additional wiring part 11 is further needed.

To this end, a separate insulating film 20 is formed on the roof antenna 40, and the wiring part 11 is formed on the roof antenna 40. The third connection terminal 12 connecting the first connection terminal 41 and the integrated circuit chip 42 is formed at both ends of the wiring unit 11.

Finally, a fourth connection terminal 46 is formed to connect the integrated circuit chip 42 and the second connection terminal 45 provided inside the loop antenna 40.

Here, when the wiring unit 11 and the third connection terminal 12 is the connection element 10, the connection element 10 may be formed in various ways, for example, silver (Ag) formed using a printing method or the like. Silver paste consisting of such components may be used. However, since the connection element 10 made of silver paste is difficult to have a uniform thickness and formation position through a printing method or the like, it may have an unwanted effect on the resonance frequency characteristic of the antenna circuit.

Therefore, a method of directly connecting the end of the loop antenna formed on the outside to the inside has been developed.

2 is a plan view illustrating an antenna circuit device according to the prior art.

Referring to FIG. 2, a loop antenna 40a is wired on the substrate 30a. In this case, the loop antenna 40a is generally formed in a spiral shape so that a longer circuit can be formed in a limited space of the substrate 30a, and the integrated circuit chip 42a is formed in one direction inside the loop antenna 40a. do.

Here, in order to directly connect the outer end of the loop antenna 40a and the integrated circuit chip 42a, the outer end should be directed inwards across the loop antenna 40a. At this time, the insulating film 20a should be formed on the upper portion of the loop antenna 40a that the outer end crosses.

In addition, when the loop antenna 40a is formed using an enameled wire, the loop antenna 40a may be formed without the need for forming the insulating film 20a, but the risk of short circuit is high.

Next, first and second connection terminals 41a and 45a are formed at both ends of the loop antenna 40a, respectively, and the integrated circuit chip 42a is provided between the first and second connection terminals 41a and 45a. Connect it.

As described above, when the outer end of the loop antenna 40a is directly connected to the inside of the loop antenna 40a, the connection element described in FIG. 1 does not occur, but there is a problem in forming the loop antenna 40a by etching or printing. Since the antenna 40a itself is very thin, the risk of a short circuit is high when it is formed by bending.

As described above, the antenna circuit device according to the prior art has a structure for connecting the integrated circuit chip, and should have a separate connection element. However, it is difficult to have a uniform thickness and formation position when arranging the connection elements, which may have an unwanted effect on the resonance frequency characteristics of the antenna circuit, and manufacture a loop antenna when the outer line of the loop antenna is directly connected inward. There is a problem that the method is quite cumbersome, which significantly increases the manufacturing cost.

The present invention includes a loop-shaped coil having a starting point on one side of the surface of the substrate and winding in the outer direction of the substrate from the starting point or inward of the substrate, and having an end point in a region adjacent to the starting point and a loop antenna. RFID, which is provided at and is electrically connected to a start point and an end point, and which includes an RFID chip arranged to overlap the coil, thereby improving the transmission and reception efficiency of the electronic card and increasing the manufacturing process yield. It is an object of the present invention to provide an antenna circuit device and an RFID card including the same.

Including a coil of the loop type having a starting point on one side and wound in the outer direction or wound inward from the starting point, to the surface of the Flexible Copper Clad Laminate (FCCL) substrate to have an end point in the region adjacent to the starting point And a loop antenna formed by a lithography process and an RFID chip provided on the loop antenna and electrically connected to the start point and the end point and mounted to overlap the loop antenna.

Here, the loop antenna is formed in a polygonal shape, wherein the coil of the start point and the end point portion is formed in a wave shape so that the RFID chip is located inside the loop antenna, the RFID chip is And an insulating film disposed below or above the insulating film, and further including an insulating film printed on the loop antenna at a portion where the RFID chip and the coil overlap with each other by a screen printer. And an insulating adhesive tape on an upper portion of the loop antenna of the portion where the coils overlap, and an insulating film formed by spraying an insulating resin on the roof antenna of the portion where the RFID chip and the coil overlap. The start point and the end point and the RFID chip further comprises a brush The cream (Solder Cream) is characterized in that it is mounted and connected by the technology of Surface Mounting Technology (SMT).

In addition, the RFID card according to the present invention is characterized in that it comprises an FCCL substrate provided with the above-described RFID antenna circuit device as an inner core layer.

According to the present invention, an RFID antenna circuit device forms an RFID chip electrically connected to a start point and an end point of a loop antenna in a loop antenna, and is arranged in an overlapping form with a coil, thereby preventing short circuits between RFID antenna circuit wiring and simplifying the structure In addition, it provides an effect that can significantly reduce the manufacturing cost and increase the yield.

Hereinafter, an RFID antenna circuit device and an RFID card including the same according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic diagram illustrating an antenna circuit device according to an embodiment of the present invention.

Referring to FIG. 3, a loop antenna 120 is formed on the substrate 100. In this case, the loop antenna 120 is formed in a spiral antenna structure having a polygonal shape, and the start point coil 130 and the end point coil 140 of the loop antenna 120 are formed to be adjacent to each other. Here, the spacing between the start point coil 130 and the end point coil 140 is preferably formed in consideration of being able to coincide with the connection terminal of the RFID chip to be formed later.

For convenience, the coil provided on the outside is referred to as the starting point, and the coil provided on the inside is referred to as the end point.

The loop antenna 120 may be formed on the flexible copper clad laminate (FCCL) substrate 100 made of polyethylene terephthalate resin (PET), BT resin, epoxy resin, or FR4 using an etching method or a printing method. In particular, it is preferable to form the lithography process. Therefore, the loop antenna 120 is formed to protrude on the surface of the substrate 100.

Next, connection terminals are formed in the start point coil 130 and the end point coil 140 of the loop antenna 120, respectively. In this case, the connection terminal may be formed at the same time as the loop antenna using a lithography process or printing using the flexible copper clad laminate (FCCL) as a part electrically connected to the RFID chip in a subsequent process. In addition, when the start point coil 130 and the end point coil 140 are formed to a thickness sufficient to perform a function as a connection terminal, the connection terminal forming process may be omitted.

Next, an insulating layer 150 is formed on the loop antenna 120 overlapping the region connecting the starting point coil 130 and the ending point coil 140 in a straight line. In this case, the insulating film 150 may be formed in consideration of the size of the RFID chip 180 formed in a subsequent process, and may be formed by printing by a screen printer, by using an insulating adhesive tape, or by spraying an insulating resin. have. In this case, when the insulating film is provided under the RFID chip 180 by itself, it may be omitted.

Next, the RFID chip 180 is formed on the insulating film 150. In this case, the RFID chip 180 includes first and second connection terminals 160 and 170 on both sides thereof. Here, the start point coil 130 and the second connection terminal 170 are connected, and the end point coil 140 and the first connection terminal 160 are connected.

In addition, since the first and second connection terminals 160 and 170 are arbitrarily ordered, the first and second connection terminals 160 and 170 may be changed as necessary.

In addition, the first and second connection terminals 160 and 170 may be formed on the RFID chip 180 and further include separate connection parts connected to the start point coil and the end point coils 130 and 140.

4 is a plan view illustrating an antenna circuit device according to an embodiment of the present invention.

Referring to FIG. 4, a loop antenna 220 is formed on the substrate 200. In this case, the loop antenna 220 is formed in a spiral antenna structure having a polygonal shape, and forms a portion where the start point and the end point of the loop antenna 220 are formed to have a wave shape. This is a modification of a portion of the loop antenna 220 to move the RFID chip inside the substrate.

Next, connection terminals (not shown) are formed in the start point coil and the end point coil of the loop antenna 220, respectively. In this case, when sufficient space around the start point coil and the end point coil of the loop antenna 220 is secured, the connection terminal may be omitted since it may be directly connected to the terminal connected to the RFID chip in a subsequent process.

Next, an insulating film 250 is formed on the loop antenna 220 between the start point coil and the end point coil. In this case, the insulating layer 250 may be formed in consideration of the size of the RFID chip 280 formed in a subsequent process, and may be formed by printing using a screen printer, by using an insulating adhesive tape, or by spraying an insulating resin. have. Here, if the insulating film is included in the lower portion of the RFID chip 280 may be omitted.

Next, the RFID chip 280 is formed on the insulating film 250. In this case, the RFID chip 280 includes first and second connection terminals 260 and 270 on both sides, and is electrically connected to the start point coil and the end point coil of the loop antenna 220 as described above.

As described above, the RFID antenna circuit apparatus according to the present invention forms an RFID chip so as to overlap the upper part of the loop antenna, thereby reducing the resonance frequency characteristic of the antenna circuit due to the connection elements required when forming the RFID chip inside the loop antenna. It is possible to prevent the effect that does not occur, and to simplify the method of manufacturing the antenna circuit device and the RFID card manufacturing process including the same.

Although the above has been described with reference to one embodiment of the present invention, various changes and modifications can be made at the level of those skilled in the art. Such changes and modifications may belong to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention will be determined by the claims described below.

1 is a schematic diagram showing an antenna circuit arrangement according to the prior art;

2 is a plan view showing an antenna circuit device according to the prior art.

3 is a schematic diagram illustrating an antenna circuit device according to an embodiment of the present invention;

Figure 4 is a plan view showing an antenna circuit device according to an embodiment of the present invention.

Claims (9)

A coil having a loop shape having a starting point on one side and winding outwardly or winding inwardly from the starting point, and formed by a lithography process on the surface of a flexible copper clad laminate (FCCL) substrate to have an end point in an area adjacent to the starting point. Loop antennas; And And an RFID (Radio Frequency Identification) chip provided on the loop antenna and electrically connected to the start point and the end point and mounted to overlap the loop antenna. delete The method of claim 1, The loop antenna is formed in a polygonal shape, and the coil of the start point and the end point portion of the RFID antenna circuit device, characterized in that formed in a wave shape so that the RFID chip is located inside the loop antenna. The method of claim 1, And the RFID chip includes an insulating film below or above the RFID chip. The method of claim 1, And an insulating film printed by a screen printer on an upper portion of the loop antenna at a portion where the RFID chip and the coil overlap each other. The method of claim 1, And an insulating adhesive tape on an upper portion of the loop antenna in a portion where the RFID chip and the coil overlap each other. The method of claim 1, And an insulating film formed by spraying an insulating resin on an upper portion of the loop antenna in a portion where the RFID chip and the coil overlap each other.       The method of claim 1,       And the start point, the end point, and the RFID chip are mounted and connected by a technology of Surface Mounting Technology (SMT) using solder cream. An RFID card comprising an FCCL substrate provided with an RFID antenna circuit device according to claim 1 as an inner core layer.

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