KR20090129384A - Portable terminal with radio frequency identification antennas - Google Patents

Abstract

PURPOSE: A portable terminal equipped with a radio recognition antenna is provided to improve a configuration and installation structure of a radio recognition antenna performing a short-range communication by installing a conductor horizontally against the longitudinal direction of a core. CONSTITUTION: An antenna(20) includes a core(210) and a coil(220). The core includes a magnetic material. The coil is wounded around the core. A conductor(30) is adjacent to the antenna. The conductor is perpendicularly installed about the longitudinal direction of the core. The conductor is a shielding film. The portable terminal is equipped with a radio recognition antenna.

Description

Portable terminals with radio frequency identification antennas

The present invention relates to a portable terminal, and more particularly, to a portable terminal having a wireless identification antenna having an improved structure and installation structure of a wireless identification antenna for performing near field communication.

Radio Frequency Identification Antennas (RFIDs) are installed in portable terminals including mobile communication devices such as mobile phones and PDAs. They are installed separately from the main communication devices, and are used for authentication, commerce, financial transactions, and transportation fee payment. Used for

In general, a portable terminal having a wireless identification antenna includes a conductive metal structure such as a printed circuit board (PCB), a shield, and a battery inside the case. If the loop antenna is used in combination with a portable terminal, loss of eddy current loss and hysteresis loss may occur due to the conductive metal structure.

This loss can render the antenna unusable or make the signal reach extremely short. Therefore, the loop antenna is pulled out of the portable terminal for use, which acts as a factor to hinder the miniaturization of the portable terminal.

In order to improve the disadvantages of the conventional portable terminal, a method of attaching a magnetic absorber sheet made of a magnetic material having a high permeability to the rear surface of the loop antenna may be used. The magnetic absorber sheet functions to reduce the loss caused by the conductive metal structure of the portable terminal.

However, the portable terminal using the magnetic absorber sheet also has a disadvantage in that the miniaturization of the device is disadvantageous in terms of the design of the case, and the communication distance of the antenna is shortened.

In order to solve such a conventional problem, to provide a short distance communication of the antenna while at the same time to enable the miniaturization of the portable terminal, to provide an antenna for the short-range communication of the improved structure, improve the installation structure of the antenna and the metal structure of the portable terminal Maximize the space utilization.

A portable terminal having a wireless identification antenna includes a housing made of an insulating material, a shielding film formed inside or outside the housing, and a circuit part shielded by the shielding film. The portable terminal includes a core made of a magnetic material and a coil wound around the core. And an conductor adjacent to the antenna and installed in a direction perpendicular to the longitudinal direction of the core.

In this case, the conductor may be a shielding film.

In addition, the conductor may be formed of at least one of a printed circuit pattern or a battery.

In addition, the conductor may have a shape of a conductive thin plate surrounding the core, and may include at least one insulation cutout on one side to prevent loss of eddy current flowing through the center of the antenna.

In addition, the conductor may be formed of a plurality of conductive patterns disposed around the core.

Therefore, since the wireless identification antenna is made of a very small size and a large induced electromotive force can be obtained, it is very advantageous to achieve miniaturization of the portable terminal and secure a long communication reach.

In addition, even if the conductor is replaced with a metal structure usually mounted in a mobile terminal, since the advantages of extending communication reach can be taken as it is, there are many advantages such as ease of assembly and reduction in manufacturing cost.

Hereinafter, a technical configuration of a portable terminal having a wireless identification antenna according to the accompanying drawings will be described in detail.

1 is a perspective view of a portable terminal according to an embodiment, FIG. 2 is a perspective view of an antenna according to an embodiment, and FIG. 3 is a plan view illustrating a schematic configuration of an antenna and a conductor according to an embodiment.

As shown in FIGS. 1 to 3, the mobile terminal 1 includes a housing 10, a shielding film, and a circuit portion.

The housing 10 is made of synthetic resin of insulating material. The shielding film is formed inside or outside the housing 10. The shielding film serves to shield the electromagnetic wave from being radiated from the electrical device mounted inside the housing 10. The circuit unit is one of electrical devices such as a printed circuit pattern mounted inside the housing 10 and is shielded by a shielding film.

In particular, the mobile terminal 1 includes an antenna 20 and a conductor 30.

The antenna 20 is composed of a core 210 and a coil 220. Core 210 is made of a magnetic material of high permeability. In addition, the coil 220 is wound on the outer circumferential surface of the core 210 several times to several tens of times. The antenna 20 configured as described above performs near field communication within several tens of millimeters, and transmits and receives an RF signal in a non-contact manner.

The voltage induced in the antenna 20 is determined by the electromagnetic induction principle according to Faraday's law and the energy conservation principle according to Lenz's law. Therefore, in order to obtain a high voltage signal, the greater the amount of magnetic flux that links to the coil 220, the more advantageous.

The core 210 of high permeability has a low loss due to eddy currents even at high frequencies, and draws a magnetic flux passing through the surrounding space to compress the magnetic flux. Therefore, the coil 220 wound around the core 210 can obtain a large induced electromotive force even with a small size.

Conductor 30 is installed adjacent to the antenna 20, it is formed wide in the vertical direction with respect to the longitudinal direction of the core (210). In this case, the distance between the conductor 30 and the antenna 20 is advantageous as the distance between the conductors is secured. That is, the distance between the conductor 30 and the antenna 20 is preferably formed 5 mm or less, more preferably 1 mm or less.

 The conductor 30 performs capacitive coupling and magnetic induction coupling to reflect and transmit induced electromotive force generated by the reader or antenna 20. In this case, the reader transmits / receives an RF signal and the like with the antenna 20, and reads a signal used for authentication, commerce, financial transaction, payment of a transportation fee, and the like.

As described above, the induced electromotive force is reflected and transmitted to the antenna 20 through the configuration and coupling structure of the antenna 20 and the conductor 30 including the core 210 and the coil 220 formed of a magnetic material having a high permeability. As a result, the communication reach is lengthened by increasing the sensitivity of the antenna 20.

Therefore, since the miniaturization of the antenna can be achieved while maintaining the communication reach distance, the miniaturization of the overall portable terminal and the performance of the antenna for short range communication can be greatly improved.

In this case, the conductor 30 may be a shielding film. In addition, the conductor 30 may be at least one of a printed circuit pattern and a battery.

That is, the conductor 30 may be replaced with a conductive metal structure installed inside or outside the housing 10 of the mobile terminal 1. In other words, the conductor 30 may be a conductive member that is manufactured separately, and may be a component that adopts at least one of a shielding film, a printed circuit pattern, and a battery.

In summary, the portable terminal 1 according to the above-described embodiment not only has a great advantage of extending communication reach through the structural combination of the conductor 30 and the antenna 20, but also the conductor 30. In general, it can be said that it has a great advantage in that it can take advantage of the expansion of communication reach as it is even if replaced by a metal structure mounted in the mobile terminal.

4 is a plan view illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 3.

As shown in FIG. 4, it is also possible to form a recess 301 recessed in one side of the conductor 30 and to install a part of the antenna 20 to be recessed in the recess 301. In this case, the antenna 20 can reduce the overall volume while having a fine clearance with the conductor 30, thereby improving space utilization.

5A is a side view illustrating a schematic configuration of an antenna and a conductor according to an embodiment, and FIGS. 5B and 5C are side views illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 5A.

As shown in FIG. 5A, the conductor 30 may be located at the center of the antenna 20, and as shown in FIG. 5B, the conductor 30 may be disposed to be deflected on one side of the antenna 20. Can be. In addition, as illustrated in FIG. 5C, the thickness of the conductor 30 may be thick according to the structure of the portable terminal.

6 is a plan view illustrating a schematic configuration of an antenna and a conductor according to another modification of FIG. 3.

As illustrated in FIG. 6, the conductor 30 may have a shape of a conductive thin plate surrounding the core 210 and may include at least one insulating cutout 303 on one side thereof. The insulation cutout 303 functions to prevent loss of eddy current flowing through the center of the antenna 20.

That is, the through hole 302 for accommodating the antenna 20 in place of the conductor 30 is formed in the perforation, and the insulation cutout 303 is formed from the through hole 302 to the outside of the conductor 30. Is formed. The through-hole 302 is formed to be finer than the area of the antenna 20, and preferably has a shape corresponding to the shape of the antenna 20 so that there is no contact portion between the conductor 30 and the antenna 20. . However, in addition to this, it is apparent that the through hole 302 may have various shapes.

FIG. 7A is a side view illustrating a schematic configuration of an antenna and a conductor according to the embodiment of FIG. 6, and FIGS. 7B and 7C are side views illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 7A.

As shown in FIG. 7A, the conductor 30 may be located at the center of the antenna 20, and as shown in FIG. 7B, the conductor 30 may be disposed to be deflected on one side of the antenna 20. Can be. In addition, as shown in FIG. 7C, the thickness of the conductor 30 may be thick according to the structure of the portable terminal. In this case, one side of the conductor 30 around the antenna 20 may be formed to be thick and the other side may be formed to be thin, and the thick and thin portions may be mixed.

Meanwhile, as in the embodiment of FIG. 2, the core 210 may be formed in a plate-shaped rectangular parallelepiped shape. In this case, the thickness of the core 210 is preferably 3 mm or less and the height is preferably 15 mm or less. Therefore, the core 210 may be effectively installed even in a narrow space formed on the side of the housing 10.

8 is a perspective view of an antenna according to a modification of FIG. 2, and FIGS. 9 and 10 are plan views illustrating schematic configurations of an antenna and a conductor according to the embodiment of FIG. 8.

That is, as shown in FIGS. 8 to 10, the core 210 may have a pillar shape. In this case, the diameter and height of the core 210 is preferably formed to 10mm or less.

On the other hand, the conductor may be a plurality of conductive patterns disposed around the core.

11 to 13 are plan views illustrating a schematic configuration of an antenna and a conductor according to another embodiment.

As shown in FIG. 11, a plurality of divided conductors 31, 32, 33 may be provided to surround the antenna 20. Such a structure has the same structure as that in which a plurality of insulating cutouts 303 are formed in the embodiment of FIG. 6.

12 and 13, one side of the antenna 20 may be a conductor 31 using a metal structure adopted at least one of a shielding film, a printed circuit pattern, and a battery. It is also possible to consist of the conductor 32 separately manufactured.

The manufacturing process of the mobile terminal having the wireless identification antenna configured as described above will be described through some embodiments in which specific numerical values are limited.

In the first embodiment, a coil 13 mm wide, 4.5 mm high and 1 mm thick is wound 7 times with a coil of 0.19 mm diameter enameled copper wire and connected to a 70PF parallel resonant capacitor to resonate at 13.56 MHz. An identification antenna was constructed. Subsequently, the wireless identification antenna was connected with the tag IC circuit to obtain a result of a communication reach distance of 30 mm with the reader.

In a second embodiment, a 50 mm long and 110 mm thin metal plate was processed into a long keyhole shape to make a conductor, and the wireless identification antenna manufactured in the first embodiment was installed in the keyhole to be spaced apart from the conductor. Subsequently, the wireless identification antenna was connected with the tag IC circuit to obtain a result of 63 mm of communication reach with the reader.

As a result, when comparing the first embodiment and the second embodiment, it can be seen that the structure in which the conductor is installed around the wireless identification antenna improves the communication reach more than twice as compared to the structure in which the conductor is not installed. there was.

In a third embodiment, the wireless identification antenna manufactured in the first embodiment is installed on one side of a conductor made of a thin metal plate having a width of 30 mm and a length of 110 mm, spaced apart from the conductor. Subsequently, the wireless identification antenna was connected with the tag IC circuit to obtain a result of 54 mm communication reach with the reader.

As a result, when comparing the first embodiment and the third embodiment, it was confirmed that the structure in which the wireless identification antenna is installed on one side of the conductor improves the communication reach by 1.8 times compared to the structure in which the conductor is not installed.

Therefore, the structure according to the third embodiment has a slight decrease in communication reach distance compared to the second embodiment. However, since the structure of the portable terminal can use a metal structure such as a shielding film, a printed circuit pattern, and a battery as a conductor, the portable terminal can be used as a conductor. It can be a very realistic structure that enables an advantageous design for miniaturization of the device.

Until now, the portable terminal having the wireless identification antenna has been described with reference to the embodiment shown in the drawings, but this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope should be defined by the technical spirit of the appended claims.

1 is a perspective view of a mobile terminal according to one embodiment;

2 is a perspective view of an antenna according to an embodiment;

3 is a plan view illustrating a schematic configuration of an antenna and a conductor according to one embodiment;

4 is a plan view illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 3;

5A is a side view illustrating a schematic configuration of an antenna and a conductor according to an embodiment.

5B and 5C are side views illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 5A.

6 is a plan view illustrating a schematic configuration of an antenna and a conductor according to another modification of FIG. 3;

7A is a side view illustrating a schematic configuration of an antenna and a conductor according to the embodiment of FIG. 6.

7B and 7C are side views illustrating a schematic configuration of an antenna and a conductor according to a modification of FIG. 7A.

8 is a perspective view of an antenna according to a modification of FIG. 2;

9 and 10 are plan views illustrating a schematic configuration of an antenna and a conductor according to the embodiment of FIG. 8.

11, 12, and 13 are plan views illustrating schematic configurations of an antenna and a conductor according to another embodiment.

<Description of the symbols for the main parts of the drawings>

1: mobile terminal 10: housing

20: antenna 210: core

220: coil 30: conductor

303: insulated incision

Claims (5)

A portable terminal comprising a housing made of an insulating material, a shielding film formed inside or outside the housing, and a circuit portion shielded by the shielding film, An antenna comprising a core made of magnetic material and a coil wound around the core; And a wireless identification antenna comprising a conductor adjacent to the antenna and installed in a direction perpendicular to the longitudinal direction of the core. The method of claim 1, The conductor is a portable terminal having a wireless identification antenna, characterized in that the shielding film. The method of claim 1, The conductor is a portable terminal having a wireless identification antenna, characterized in that at least one of a printed circuit pattern or a battery. The method according to any one of claims 1 to 3, The conductor has a shape of a conductive thin plate surrounding the core, and has a wireless identification antenna having at least one insulation cutout on one side to prevent the loss of eddy current flowing through the center of the antenna. The method according to any one of claims 1 to 3, And the conductor is a plurality of conductive patterns arranged around the core.

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