KR101587133B1 - Portable terminal - Google Patents

Abstract

A mobile terminal according to the present disclosure includes a terminal case; And a plurality of antennas embedded in the terminal case, wherein the plurality of antennas includes: a first antenna provided on one side of a circuit board forming a first ground; And at least one diversity antenna disposed on a side surface of the circuit board so as to be at an angle with respect to the circuit board and having a ground independent of the first ground and fed to the circuit board.

Description

[0001] PORTABLE TERMINAL [0002]

The present invention relates to an antenna of a mobile terminal.

A mobile terminal is a portable device that is portable and has one or more functions such as voice and video call function, information input / output function, and data storage function.

As the functions are diversified, the mobile terminal has complicated functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc., and they are integrated in a multimedia player (Multimedia Player) .

Various new attempts have been made in terms of hardware or software to implement complex functions in such multimedia devices. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

As the type and amount of data to be transmitted through the mobile terminal are increased, attempts have been made to meet the performance of the wireless antenna. However, the miniaturization tendency of the mobile terminal is not easy to overcome the spatial diversity among the antennas, and there are problems such as mutual coupling due to narrow installation distance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to minimize mutual coupling between antennas installed in a limited space and improve radio performance.

The present invention also proposes an antenna structure that maximizes space and polarization diversity in a confined space, while facilitating modularization and fabrication.

According to an aspect of the present invention, there is provided a mobile terminal including: a terminal case; And a plurality of antennas embedded in the terminal case, wherein the plurality of antennas includes: a first antenna provided on one side of a circuit board forming a first ground; And at least one diversity antenna disposed on a side surface of the circuit board so as to be at an angle with respect to the circuit board and having a ground independent of the first ground and fed to the circuit board.

In one embodiment of the present invention, the diversity antenna includes: a second antenna disposed on one side of the circuit board; And a third antenna disposed on the other side of the circuit board.

In one embodiment of the present invention, the second antenna may have a second ground independent of the first ground, and the third antenna may have a third ground independent of the first and second grounds.

As an example related to the present invention, the second antenna and the third antenna may be formed to be substantially 90 degrees with respect to the first antenna.

As an example related to the present invention, the diversity antenna may be formed in the form of a chip antenna.

As an example related to the present invention, the second ground and the third ground may be electrically disconnected from the first ground.

As an example related to the present invention, the diversity antenna may be arranged to be fixed to the inner surface of the terminal case.

The mobile terminal according to the present disclosure may further comprise: a terminal case; A first antenna provided on one side of a circuit board forming a first ground; And an antenna assembly embedded in the terminal case, wherein the antenna assembly is disposed on both sides of the circuit board so as to have a predetermined angle with respect to the circuit board, and has a ground independent of the first ground, Second and third antennas fed to the circuit board; And a ground extension portion formed to support the second and third antennas and connected to the first ground to extend the length of the first ground.

As an example related to the present invention, the ground extending portion may be formed in the form of a flexible circuit board.

As an example related to the present invention, the ground extending portion may be formed parallel to the circuit board.

As an example related to the present invention, the ground extending portion may be disposed apart from the circuit board.

In one embodiment of the present invention, the ground extending portion is formed with respective antenna attaching portions for attaching the second and third antennas, and the feeding portions of the second and third antennas are connected to the antenna attaching portions, And an antenna transmission line portion that can be connected to the substrate.

As an example related to the present invention, the antenna transmission line portion may be formed in the form of a coaxial cable or a flexible circuit board.

In one embodiment of the present invention, the ground of the antenna transmission line portion may be formed to connect the ground extension portion to the first ground of the circuit board.

The antenna assembly may be embedded in a case of a mobile terminal or a wireless modem device. The antenna assembly may include: a first antenna disposed on one side of a circuit board forming a first ground; Second and third antennas disposed on both sides of the circuit board so as to have an angle with respect to the circuit board, the second antenna having a ground independent of the first ground and fed to the circuit board; And a ground extension portion formed to support the second and third antennas and connected to the first ground to extend a length of the first ground.

As described above, according to the antenna structure of the mobile terminal according to the present invention, since the second antenna or the third antenna having a ground independent of the first antenna is used as an antenna for diversity, it is possible to improve inter-antenna isolation characteristics In addition, the deterioration of the radio characteristics of the first antenna can be minimized. As a result, it can be suitably applied to terminals requiring high data processing capacity such as LTE and HRPD.

Hereinafter, a mobile terminal according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a front perspective view of a mobile terminal according to the present invention. Referring to FIG. 1, the mobile terminal 100 includes a 'bar' type terminal body 101. However, the present invention is not limited to the bar type mobile terminal shown in FIG. 1, but may be a 'folder' type in which two terminal bodies are foldably connected, a 'slide' Type or a mobile terminal having a form factor.

A case (which may be referred to as a casing, a housing, a cover, and the like) constituting the appearance of the terminal body 101 is formed by the front case 102 and the rear case 103. Various electronic components are embedded in the space formed by the front case 102 and the rear case 103. [ At least one intermediate case may be additionally disposed between the front case 102 and the rear case 103. [

A display unit 151, an acoustic output unit 152, an image input unit 121, an acoustic input unit 122, and the like may be disposed on a front surface of the terminal body 101. The first operation unit 131,

The first operation unit 131 receives a command for controlling the operation of the mobile terminal related to the present invention.

The display unit 151 includes an LCD (Liquid Crystal Display) module, an OLED (Organic Light Emitting Diodes) module, an e-paper, and a TOLED (Transparent OLED) for visually expressing information. Also, the display unit 151 includes touch sensing means to receive information or control commands by the user's touch. The touch sensing means may include a transparent electrode film disposed inside the window.

The sound output unit 152 may be implemented in the form of a receiver or a loudspeaker.

The image input unit 121 may be implemented in the form of a camera module for capturing an image or a moving image of a user.

The sound input unit 122 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like.

The display unit 151, the sound output unit 152 and the sound output unit described above may be installed on the other side of the terminal body 101 (e.g., on the side or rear surface of the terminal body) or may be additionally installed.

As shown in FIG. 1, a second operating unit 132, an interface unit 170, a broadcast signal receiving antenna 118, and the like may be disposed on a side surface of the mobile terminal 100.

The second operating portion 132 may be installed on a side surface of the terminal body 101. The second operating portion 132 together with the first operating portion 131 may be collectively referred to as a manipulating portion and may be employed in any manner as long as the user operates in a tactile manner. For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

In a functional aspect, the first operation unit 131 is for inputting information such as numbers, letters, symbols, or a menu such as start, end, etc., and the second operation unit 132 is for inputting, Or as a hot-key for performing a special function such as activation of the input unit 121 and the like.

The interface unit 170 is a path for allowing the mobile terminal 100 to exchange data with an external device. For example, the interface unit 170 may be a wired or wireless connection terminal for connecting to an earphone, a port for short-range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port a wireless Lan port), or power supply terminals for supplying power to the mobile terminal. The interface unit 170 may be a card socket that accommodates an external card such as a SIM (subscriber identification module) or a UIM (user identity module), a memory card for information storage, and the like.

On one side of the terminal body 101, an antenna for receiving broadcast signals may be arranged in addition to an antenna for a call or the like. The antenna may be installed to be rotatable after being drawn out or drawn out to the rear case 103.

2 is a perspective view of a circuit board assembly with an antenna associated with the present invention.

As shown in FIG. 2, the circuit board 201 embedded in the cases 102 and 103 may be mounted with the display portion 151, the sound output portion 152, and the antenna integrally.

A first antenna 210 is provided on one side of the circuit board 201. The first antenna 210 may be configured to operate in multiple wireless communication bands provided by the portable terminal 100 (multi-band). The first antenna 210 may be disposed at an end of the terminal body 101 so as to minimize interference or hand effect with other components.

The circuit board 201 may have a multilayer structure when viewed from the side, or may be formed into a plurality of structures when viewed in plan view. The circuit board 201 forms a first ground 202 related to a physical length corresponding to a low band among bands served by the first antenna 210. [ The first ground 202 also extends the radio performance by extending as described below.

On both sides of the circuit board 201, second and third antennas 240 and 250 configured to have a constant distance (distance) from the first antenna 210 are respectively installed. The second and third antennas 240 and 250 may be referred to as a 'diversity antenna' in that they implement spatial diversity of the first antenna 210. However, the configuration including both the second antenna 240 and the third antenna 250 is not essential, and either one of them may be omitted. The first, second and third antennas 210, 240 and 250 form a smart antenna system for implementing, for example, Multiple Input Multiple Out (MIMO). Such an antenna system can be suitably used for terminals requiring a large amount of wireless data processing such as LTE, HRPD, and the like.

In order to realize MIMO diversity, it is recommended to increase the physical distance of the second antenna 240 and the third antenna 250 to the first antenna 210. However, the condition of the inner space of the mobile terminal, It is difficult to satisfy. On the other hand, if the distance of the second antenna 240 or the third antenna 250 to the first antenna 210 is reduced, problems such as mutual coupling occur.

The second antenna 240 and the third antenna 250 are basically connected to the second and third grounds 252 and 253 electrically isolated from the first ground 202 used by the first antenna 210, ). The second antenna 240 or the third antenna 250 may be a chip antenna using a high dielectric constant.

In terms of arrangement, the second antenna 240 and the third antenna 250 form an angle with respect to the circuit board 201. As a result, the radiation pattern of the second antenna 240 and the third antenna 250 has a different direction from the radiation pattern of the first antenna 210, so that the polarization characteristics are improved. Referring to FIG. 2, the second antenna 240 and the third antenna 250 are disposed at about 90 degrees with respect to the circuit board 201.

In terms of structure, the second antenna 240 and the third antenna 250 have grounds 242 and 252 independent of the first ground, and are supported on respective substrates (hard circuit boards or flexible circuit boards) Can be implemented.

Such a structure and arrangement will be described with reference to Fig. 3 is an exemplary cross-sectional view of an antenna assembly associated with the present invention. The first ground 202 directly affects the radiation characteristic of the first antenna 210 is formed on the circuit board 201. The second antenna 240 and the third antenna 250 that are fed to the circuit board 201 are formed on both sides of the circuit board 201 and are electrically connected to the independent radiators 241 and 251 and the grounds 242 and 252, .

The second ground 242 of the second antenna 240 and the third ground 252 of the third antenna 250 operate independently of the first ground 202 of the circuit board 201, Thereby minimizing the influence on the second antenna 240 or the third antenna 250.

4 is another exemplary cross-sectional view of an antenna assembly associated with the present invention. 4, each of the radiators 241 'and 251' constituting the second antenna 240 'and the third antenna 250' is electrically connected to the second ground 242 'and the third ground 252' It is located on the opposite side.

5 is a cross-sectional view illustrating the mounting process of the antenna assembly according to the present invention. The second antenna 240 and the third antenna 250 can be formed directly on the case 102 in terms of manufacturing. 5 (a), after the antenna mounting portion 102a is formed in the case 102, the second antenna 240 and the third antenna 250 are attached to the antenna mounting portion 102a 5 (b)), the circuit board 201 is shielded from the ground of the second antenna 240 and the third antenna 250 (Fig. 5 (c)).

When the second antenna 240 or the third antenna 250 is directly attached to the case 102 and treated as a case-integrated module, the second antenna 240 and the third antenna 250 are mounted on the circuit board 201 ), It is easier to handle and assemble it, and the manufacturing cost can be reduced.

6 is a perspective view showing another form of a circuit board assembly related to the present invention.

Referring to FIG. 6, the second antenna 340 and the third antenna 350 include a structure for being connected to the circuit board 301. The radio signal received through the second antenna 340 or the radio signal to be radiated into the space through the second antenna 340 is transmitted through the antenna transmission line units 345 and 355 and the connectors 346 and 356.

The antenna transmission lines 345 and 355 are connected to the second antenna 340 or the third antenna 350 and are formed in the form of a coaxial cable or a flexible circuit board and are connected to corresponding positions of the circuit board 301.

Referring to FIG. 6, the second antenna 340 and the third antenna 350 are fixed to a separate structure 360 supporting them. In such a structure 360, a ground extension 361 made of a conductor is mounted. The ground extending portion 361 is introduced to solve the problem of ensuring a sufficient length due to the miniaturization of the circuit board 201. The ground extending portion 361 is connected to the first ground 302 of the circuit board 301, . As a result, the radio characteristic particularly in the low band is improved. The ground extension portion 361 may be spaced apart from the circuit board 301 by a predetermined gap, and other parts or elements may be disposed in the gap.

FIG. 7 is an explanatory view showing equivalent operation of the structure of FIG. 6. FIG.

When the physical length of the first ground of the circuit board 301 is L1 and the physical length of the ground extension 361 is L2 as shown in Fig. 7 (a) 2 antenna has the effect of adding the length L1 of the ground of the circuit board 301 and the length L2 of the ground extension portion (Fig. 7 (b)).

FIG. 8 is a perspective view illustrating the mounting process of the antenna assembly according to the present invention.

8A shows that the second antenna 340 and the third antenna 350 are mounted using the ground extension portion 361 formed in the form of a flexible circuit board.

First, a flexible circuit board 360 having at least one conductive layer over the entire surface is provided (Fig. 8A). An antenna transmission line portion 345 and 355 for supplying power to the second antenna 340 and the third antenna 350 are connected to the flexible circuit board 360.

8B, when the second antenna 340 and the third antenna 350 to be attached next are attached, the flexible circuit board 360 is connected to the feeding part of the second antenna 340 and the feeding part of the third antenna 350 And a pad 370 to which the power feeder 347 is connected. The edge portion may be bent so that the second antenna 340 and the third antenna 350 can be formed at an angle with respect to the circuit board 301. [

Next, the second antenna 340 and the third antenna 350 having independent grounds are attached to the flexible circuit board 360 as shown in FIG. 8C.

The attached second antenna 340 and the third antenna combination are mounted on the case 102 as shown in FIG. 8D and then connected to the connectors 346 and 356 of the antenna transmission lines 345 and 355 in a state where the circuit board assembly 300 is disposed. And connected to the receptacles 307 and 308 formed on the circuit board 301 (FIG. 8E).

The above-described mobile terminal and antenna assembly are not limited in the configuration and method of the embodiments described above, but the embodiments may be modified so that all or some of the embodiments are selectively combined .

1 is a front perspective view of a mobile terminal according to the present invention;

Figure 2 is a perspective view of a circuit board assembly with an antenna associated with the present invention.

3 is an exemplary cross-sectional view of an antenna assembly in accordance with the present invention;

4 is another exemplary cross-sectional view of an antenna assembly associated with the present invention

5 is a cross-sectional view illustrating the mounting process of the antenna assembly according to the present invention.

6 is a perspective view showing another form of a circuit board assembly related to the present invention.

Fig. 7 is an explanatory view showing equivalent operation of the structure of Fig. 6

FIG. 8 is a view illustrating a mounting process of the antenna assembly according to the present invention,

Claims (15)

delete delete delete delete delete delete delete A terminal case; A first antenna provided on one side of a circuit board forming a first ground; And And an antenna assembly embedded in the terminal case, Second and third antennas disposed on both sides of the circuit board so as to have an angle with respect to the circuit board and having a ground independent of the first ground and fed to the circuit board; And And a ground extension part formed to support the second and third antennas and connected to the first ground to extend the length of the first ground. 9. The method of claim 8, Wherein the ground extension portion is formed in the form of a flexible circuit board. 9. The method of claim 8, Wherein the ground extension part is formed parallel to the circuit board and is formed to be freely changeable according to an installation space. 9. The method of claim 8, And the ground extension part is disposed to be spaced apart from the circuit board. 9. The method of claim 8, The ground extending portion is formed with antenna attaching portions for attaching the second and third antennas, and the antenna attaching portions are provided with antenna transmission lines for connecting the feeding portions of the second and third antennas to the circuit board, And a mobile terminal. 13. The method of claim 12, Wherein the antenna transmission line portion is formed in the form of a coaxial cable or a flexible circuit board. 14. The method of claim 13, And the ground of the antenna transmission line portion is formed to connect the ground extension portion to the first ground of the circuit board. An antenna assembly for use in a mobile terminal or a case of a wireless modem device, the antenna assembly comprising: A first antenna provided on one side of a circuit board forming a first ground; And Second and third antennas disposed on both sides of the circuit board so as to have an angle with respect to the circuit board and having a ground independent of the first ground and fed to the circuit board; And And a ground extending portion formed to support the second and third antennas and connected to the first ground to extend the length of the first ground.

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