WO2014126418A1

WO2014126418A1 - Wireless communication antenna module and portable terminal comprising same

Info

Publication number: WO2014126418A1
Application number: PCT/KR2014/001231
Authority: WO
Inventors: 정을영; 백형일; 김범진; 이치호; 이도형
Original assignee: 주식회사 아모텍
Priority date: 2013-02-14
Filing date: 2014-02-14
Publication date: 2014-08-21

Abstract

Disclosed is a wireless communication antenna module in which a radiation sheet provided with an opening and a slot is laminated on top of an antenna sheet, and thereby maximizes antenna performance. The disclosed wireless communication antenna module comprises: the antenna sheet on which a radiation pattern is provided in loop shape formed by a wire placed along the periphery of a non-patterned portion in the form of a plurality of loops; and the radiation sheet laminated on the upper surface of the antenna sheet, wherein the radiation sheet is provided with the opening and a plurality of slits and is laminated so that the opening and the plurality of slits form an overlapping area with a radiation pattern.

Description

Wireless communication antenna module and portable terminal having same

The present invention relates to a wireless communication antenna module, and more particularly, to a wireless communication antenna module for communicating with a wireless communication antenna module embedded in a portable terminal and embedded in another portable terminal, and a portable terminal having the same (WIRELESS COMMUNICATION ANTENNA MODULE) AND PORTABLE TERMINAL HAVING THE SAME.

The present invention claims the benefit of the Korean Patent Application No. 10-2013-0015840 filed February 14, 2013 and the Korean Patent Application No. 10-2014-0017217 filed February 14, 2014, the contents of all Is included herein.

With the development of technology, mobile terminals such as mobile phones, PDAs, PMPs, navigation systems, laptops, etc., are not only basic functions such as calls, video / music playback, directions, etc. Additional features are provided. Accordingly, the portable terminal is provided with a plurality of antennas for wireless communication, such as wireless internet and Bluetooth.

In addition, recently, there has been a trend to apply functions such as information exchange, payment, ticket reservation, search, etc. between terminals using short-range communication (ie, NFC) to the portable terminal. To this end, the portable terminal is equipped with a portable terminal antenna module (that is, a wireless communication antenna module) used in the short-range communication method. In this case, the wireless communication antenna module used is a non-contact short-range wireless communication module using a frequency band of about 13.56 GHz as one of RFIDs and transmits data between terminals at a close distance of about 10 cm. The wireless antenna module is widely used not only for payment but also for transmitting goods information or travel information for visitors, traffic, and access control lock devices in supermarkets or general stores.

In recent years, the market of portable terminals, such as a tablet and a smart phone, is expanding rapidly. Portable terminals have tended to include functions such as information exchange, payment, ticket reservation, and search between terminals using short-range communication (ie, NFC). Accordingly, there is an increasing demand for wireless communication antenna modules used in short-range communication. Prior patents related to a wireless communication antenna module include Korea Patent Publication No. 10-2009-0126323 (name: NFC module, in particular NFC module for mobile phone), Korea Patent Registration 10-1098263 (name: NFC loop antenna) and the like. .

In the portable terminal, a differential antenna type wireless communication antenna module is mainly used. In the differential antenna type wireless communication antenna module, a signal is received from an external terminal through a radiator pattern, and signal transmission is performed only at a signal line connected to one end of the radiator pattern. Accordingly, in the conventional wireless communication antenna module, since the reception strength of the received signal is weak, the reception performance in the reader mode is degraded, and the reader mode recognition distance is reduced.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to provide a wireless communication antenna module for maximizing antenna performance by stacking a radiation sheet having an opening and a slot formed thereon.

In order to achieve the above object, a wireless communication antenna module according to an embodiment of the present invention, the antenna sheet is a radiation pattern is formed in a loop shape in which the wire is wound a plurality of times along the outer periphery of the pattern unformed portion; And a radiation sheet laminated on an upper surface of the antenna sheet, wherein the radiation sheet is formed by forming an opening and a plurality of slits, and forming the overlapping region with an opening and a plurality of slits.

The opening formed in the radiation sheet may be stacked in an area of which an outer circumference is formed with a radiation pattern. At this time, the openings formed in the radiation sheet may have an outer circumference laminated on the outer circumference of the pattern non-forming portion.

The spinning sheet includes: a first slit extending from one side of the opening in one direction of the opening; And a second slit extending from the other side of the opening in the other direction of the opening. In this case, the second slit is disposed to face the first slit.

The first slit may be stacked in an area where one side connected to one side of the opening is formed with a radiation pattern, and the second slit may be stacked in an area where one side connected to the other side of the opening is formed with a radiation pattern.

The protective sheet may further include a protective sheet stacked on the opening and the plurality of slits.

A portable terminal for achieving the object of the present invention, the portable terminal body; A rear housing mounted to the rear of the portable terminal body; And a wireless communication antenna module mounted inside the rear housing, wherein the wireless communication antenna module is the wireless communication antenna module according to any one of claims 1 to 6. At this time, the radiation sheet of the wireless communication antenna module is included in the rear housing.

According to the present invention, the wireless antenna module by forming an opening and a plurality of slits in the radiation sheet and laminated to the radiation pattern, thereby increasing the radiation area of the magnetic field through the magnetic field coupling of the radiation pattern and the radiation sheet and the magnetic flux loop by the radiation sheet By increasing the number, the antenna performance is maximized.

1 to 6 are diagrams for explaining a wireless communication antenna module according to an embodiment of the present invention.

7 to 9 are views for explaining a mobile terminal having a wireless communication antenna module according to an embodiment of the present invention.

10 is a view showing a flow of current when driving a wireless communication antenna module according to an embodiment of the present invention.

11 to 13 are diagrams for explaining the antenna characteristics of the wireless communication antenna module of the present invention.

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. . First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, a wireless communication antenna module and a portable terminal having the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, the wireless communication antenna module according to an embodiment of the present invention can be applied to near field communication such as NFC, BLUETOOTH, etc. Hereinafter, the wireless communication antenna module applied to the NFC band will be described as an example.

1 to 6 are diagrams for explaining the wireless communication antenna module 100 according to an embodiment of the present invention. As shown in FIG. 1, the wireless communication antenna module 100 according to the embodiment of the present invention includes an antenna sheet 110 and a radiation sheet 120.

The antenna sheet 110 is formed with a radiation pattern resonating in the wireless communication frequency band. The antenna sheet 110 has a radiation pattern formed on at least one of the upper and lower surfaces. In this case, the antenna sheet 110 may be formed of one sheet having a radiation pattern or may be formed by stacking a plurality of sheets having a radiation pattern. In this case, as shown in FIG. 2, the antenna sheet 110 is provided with a pattern unformed portion 112, a radiation pattern 114, and a feed terminal 116.

The pattern unformed portion 112 is formed over a predetermined region from the center portion of the antenna sheet 110 for ideal radiation of the magnetic field. Here, in FIG. 2, the pattern non-forming part 112 is illustrated as being formed in a quadrangular shape, but is not limited thereto and may be formed in various shapes such as a circle and a polygon.

The radiation pattern 114 is formed in a loop shape in which a wire is wound a plurality of times along the outer circumference of the pattern non-forming part 112. At this time, the radiation pattern 114 is formed by winding as many turns (turns: 1 turn or more) determined by an inductance set according to the characteristics of the wireless communication antenna module 100. Both ends of the radiation pattern 114 are connected to a feed terminal 116 connected to a circuit (ie, a feed circuit) of the portable terminal.

The radiation sheet 120 is made of metal and stacked on the antenna sheet 110 to drive the auxiliary radiator of the radiation pattern 114 formed on the antenna sheet 110. In this case, the radiation sheet 120 is driven as an auxiliary radiator through magnetic field coupling with the radiation pattern 114 in a region overlapping the radiation pattern 114 formed on the antenna sheet 110. To this end, as shown in FIG. 3, the radiation sheet 120 has an opening 122, a first slit 124, and a second slit 126.

The opening 122 is formed at the center of the overlapping region where the antenna sheet 110 and the radiation sheet 120 overlap. In this case, as shown in FIG. 4, the opening 122 is stacked in an area around which the radiation pattern 114 is formed. That is, the opening 122 is formed to have a larger size than the pattern unformed part 112 of the antenna sheet 110, and the outer circumference thereof is stacked in the region where the radiation pattern 114 is formed. Accordingly, the outer circumference of the opening 122 is spaced apart from the outer circumference of the pattern non-forming part 112 by a predetermined distance.

Of course, as shown in FIG. 5, the outer circumference of the opening 122 may be stacked on the outer circumference of the pattern non-forming part 112. That is, the opening 122 is formed to have the same size as the pattern unformed part 112 of the antenna sheet 110, and an outer circumference thereof is stacked on the outer circumference of the pattern unformed part 112. Accordingly, the outer circumference of the opening 122 may be aligned with the outer circumference of the pattern non-forming part 112.

3 to 5, the opening 122 is formed in a rectangular shape, but is not limited thereto. The opening 122 may be formed in various shapes according to the shape of the pattern non-forming part 112 formed in the antenna sheet 110. .

The first slit 124 extends from one side of the opening 122. It is formed in the outward direction of the opening 122. That is, the first slit 124 extends from the left side of the opening 122 to the left side (left edge) of the spinning sheet 120. In this case, one side of the first slit 124 where the opening 122 is connected to the left side is stacked in an area in which the radiation pattern 114 is formed.

The second slit 126 extends from the other side of the opening 122. It is formed in the outward direction of the opening 122. In this case, the second slit 126 is formed in a direction opposite to the first slit 124. That is, the second slit 126 extends from the right side of the opening 122 to the right side (right edge) of the spinning sheet 120. In this case, one side of the second slit 126 connected to the right side of the second slit 126 is stacked in an area in which the radiation pattern 114 is formed.

As the radiation sheet 120 is formed with the opening 122, the first slit 124, and the second slit 126, a part of the radiation pattern 114 formed in the antenna sheet 110 may be formed in the radiation sheet 120. It is exposed inside the first slit 124 and the second slit 126. Accordingly, the radiation sheet 120 drives to the auxiliary radiator of the radiation pattern 114 through magnetic field coupling with the radiation pattern 114 exposed therein.

Meanwhile, as shown in FIG. 6, the wireless communication antenna module 100 may further include a protection sheet 130.

The protective sheet 130 is made of a resin material such as plastic, and overlaps with the opening 112 and the plurality of

slits

124 and 126 to be laminated. That is, the opening 122, the first slit 124, and the second slit 126 of the spinning sheet 120 are formed to cover the shape. The protective sheet 130 prevents damage of the radiation pattern 114 exposed inside the opening 122, the first slit 124, and the second slit 126. At this time, the protection sheet 130 may be formed of the design of the company's logo, marks, advertising, contacts and the like.

In the above description, the antenna sheet 100, the radiation sheet 120 and the protective sheet 130 has been described as being composed of one module, but is not limited thereto. The antenna sheet 100 may be mounted on a portable terminal body or a battery. One surface of the rear housing 200 of the portable terminal may be formed of the radiation sheet 120 and the protective sheet 130. In this case, the radiation sheet 120 is formed on one surface of the rear housing 200 of the portable terminal using a metal material. The protective sheet 130 may be formed using a resin material on one surface of the rear housing 200 of the portable terminal. In this case, the antenna sheet 100, the radiation sheet 120, and the protective sheet 130 operate as one wireless communication antenna module as the rear housing 200 is coupled to the portable terminal body.

7 to 9 are diagrams for explaining a mobile terminal having a wireless communication antenna module according to an embodiment of the present invention.

As shown in FIG. 7, the portable terminal includes a rear housing 200 on which the wireless communication antenna module 100 is mounted. Here, in FIG. 7, the wireless communication antenna module 100 is formed in a rectangular shape, but may be formed in various shapes according to the internal shape of the rear housing 200.

The rear housing 200 is formed of a resin material or a metal material such as plastic, and the wireless communication antenna module 100 is mounted inside. In this case, the wireless communication antenna module 100 may be disposed around a short side of one side of the rear housing 200 (see FIG. 8) or may be disposed in the center portion (see FIG. 9).

Accordingly, the antenna sheet 110 is formed with a radiation pattern 114 is laminated on the inner side of the rear housing 200 (that is, the main body direction of the portable terminal).

The radiation sheet 120 is stacked on top of the antenna sheet 110 such that the opening 122 overlaps a portion of the radiation pattern 114. That is, the stack 122 overlaps a part of the radiation pattern 114 formed in the antenna sheet 110 through the opening 122 formed in the radiation sheet 120 and the first slit 124 and the second slit 126. Accordingly, the radiation sheet 120 drives to the auxiliary radiator through magnetic field coupling with the radiation pattern 114 exposed to the outside.

Thereafter, the protective sheet 130 is stacked in such a manner as to cover the upper part of the opening 122, the first slit 124, and the second slit 126 to protect the exposed radiation pattern 114.

10 is a view showing the flow of current when driving the wireless communication antenna module according to an embodiment of the present invention. Referring to FIG. 10, as power is applied from the power supply of the portable terminal, a current I is applied to the radiation pattern 114 of the antenna sheet 110. Accordingly, the counterclockwise current flows through the radiation pattern 114. At this time, the magnetic flux is generated in the radiation pattern 114 by the counterclockwise current. Since the magnetic flux generated in the radiation pattern 114 tries to link the radiation sheet 120, the induced current (that is, in the opposite direction to the direction of the current flowing in the radiation pattern 114) around the opening 122 of the radiation sheet 120. , Clockwise induction current). At this time, the induced current generated in the radiation sheet 120 flows around the outer circumference of the radiation sheet 120. Accordingly, the wireless communication antenna module has a large radiation area of the magnetic field, and the magnetic flux loop is increased by the radiation sheet 120.

10 is a view illustrating antenna characteristics of a wireless communication antenna module of the present invention, a conventional wireless communication antenna module without a radiation sheet, and a wireless communication antenna module with a radiation sheet without an opening and a slit.

Through this, the wireless communication antenna module of the present invention is compared to the conventional wireless communication antenna module without the radiation sheet, the wireless communication antenna module with the radiation sheet without the opening and the slit, the recognition distance and EMV in the reader mode It can be seen that the antenna performance is improved by increasing the load modulation characteristic.

11 is a view illustrating antenna characteristics according to a width change of

slits

124 and 126 formed in a radiation sheet in a wireless communication antenna module of the present invention. In FIG. 11, the overall size of the antenna sheet 110, the size of the opening 122, and the size of the radiation sheet 120 are kept the same, and the widths of the slits are 1 mm, 3 mm, 5 mm, 10 mm, and 20 mm. The data measured by each change are shown.

Through this, in the wireless communication antenna module 100 of the present invention, when the width of the

slots

124 and 126 is formed to be less than or equal to the length of one side of the opening 122, the recognition distance and the EMV Load modulation characteristics are increased in the reader mode. It can be seen that the antenna performance is improved.

FIG. 13 illustrates antenna characteristics according to a change in the size of an opening formed in the radiation sheet 120 in the wireless communication antenna module 100 of the present invention. In FIG. 13, the overall size of the antenna sheet 110, the size of the radiation sheet 120, and the widths of the slits are kept the same, and the size of the opening 122 is 10 × 11, 15 × 11, 20 × 11, 30 ×. The data measured by changing to 11 and 40x11 respectively is shown.

Through this, in the wireless communication antenna module 100 of the present invention, when the size of the opening 122 is formed to be larger than the inner circumference of the radiation pattern 114 or less than the outer circumference, the recognition distance and EMV load modulation characteristics in the reader mode are increased. It can be seen that the antenna performance is improved.

As described above, the wireless communication antenna module forms an opening and a plurality of slits in the radiation sheet and stacks them in the radiation pattern, thereby increasing the radiation area of the magnetic field through the magnetic field coupling of the radiation pattern and the radiation sheet, and the magnetic flux loop by the radiation sheet. By increasing the number, the antenna performance is maximized.

Although a preferred embodiment according to the present invention has been described above, it is possible to modify in various forms, and those skilled in the art to various modifications and modifications without departing from the claims of the present invention It is understood that it may be practiced.

Claims

An antenna sheet in which a radiation pattern is formed in a loop shape in which a wire is wound a plurality of times along an outer circumference of the pattern unformed portion; And

A radiation sheet stacked on an upper surface of the antenna sheet,

The spinning sheet,

An opening and a plurality of slits are formed, and the opening and the plurality of slits are stacked by forming an overlapping region with the radiation pattern.
The method of claim 1,

The opening formed in the spinning sheet,

Wireless communication antenna module, characterized in that the outer circumference is laminated in the region where the radiation pattern is formed.
The method of claim 1,

The opening formed in the spinning sheet,

Wireless communication antenna module, characterized in that the outer circumference is laminated on the outer circumference of the pattern unformed portion.
The method of claim 1,

The spinning sheet,

A first slit extending from one side of the opening in one direction of the opening; And

And a second slit extending from the other side of the opening in the other direction of the opening.
The method of claim 4, wherein

And the second slit is disposed opposite to the first slit.
The method of claim 4, wherein

The first slit is a wireless communication antenna module, characterized in that the one side connected to one side of the opening is stacked in the region where the radiation pattern is formed.
The method of claim 4, wherein

The second slit is a wireless communication antenna module, characterized in that the one side connected to the other side of the opening is stacked in the region where the radiation pattern is formed.
The method of claim 1,

And a protective sheet overlapping the opening and the plurality of slits.
A portable terminal body;

A rear housing mounted to the rear of the portable terminal main body; And

A wireless communication antenna module mounted inside the rear housing,

The wireless communication antenna module is a portable terminal, characterized in that the wireless communication antenna module according to any one of claims 1 to 8.
The method of claim 9,

The radiation sheet of the wireless communication antenna module is characterized in that it is included in the rear housing.