KR20090004235A - Handheld terminal - Google Patents

Abstract

The present invention relates to a portable terminal having a diversity antenna, comprising: a terminal body having a circuit board on which a ground is formed; A first antenna disposed on one side of the circuit board to feed the circuit board; A second antenna disposed at a predetermined distance from the first antenna to implement diversity of the first antenna; And a ground extension configured to allow the second antenna to be directly grounded and to extend a ground of the circuit board.

Description

Mobile terminal {PORTABLE TERMINAL}

The present invention relates to a portable terminal having a diversity antenna.

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

As the functions are diversified, the portable terminal may have complicated functions such as photographing a picture or video, playing a music or video file, receiving a game, or receiving a broadcast. These features can be integrated into a comprehensive multimedia player.

In order to implement complex functions, various new attempts have been applied to portable terminals in terms of hardware or software. In addition, a user interface environment is provided for a user to search for or select a function easily and conveniently.

One aspect of the development of information and communication technology includes a dramatic increase in the amount of data that can be transmitted and received and the transmission speed. To do this, the antenna needs to receive a large amount of wireless data in a clean quality while moving.

In the antenna design of a portable terminal for high-speed wireless data transmission, there is a problem of cancel out due to interference between signals received through different paths, and an antenna for solving this problem is suitable for the overall appearance of the portable terminal. They are required to have arrangements that meet the trend of light weight and simplification of portable terminals, which are being integrated at a high density.

An object of the present invention is to provide good radio performance by reducing the loss of radio data having a high data rate reached to the terminal while moving.

Another object of the present invention is to develop an antenna device capable of implementing diversity to reduce extinction between radio signals due to multipath.

Another aspect of the present invention is to allow such an antenna device to be easily applied to a portable terminal of a thin and simple form.

In order to achieve the above object, the present invention, the terminal body is provided with a circuit board is formed; A first antenna disposed on one side of the circuit board to feed the circuit board; A second antenna disposed at a predetermined distance from the first antenna to implement diversity of the first antenna; And a ground extension configured to allow the second antenna to be directly grounded and to extend a ground of the circuit board.

As a result, the second antenna to implement diversity can directly use the ground of the circuit board of the portable terminal, which is becoming smaller and smaller as it becomes lighter and shorter, thereby making it suitable for high-speed data transmission.

In particular, the second antenna which can use a wide ground can obtain a portable terminal having good wireless performance in a low band communication band by applying a flat antenna or an improved antenna.

In addition, as an object capable of extending the ground of a limited area of a small circuit board, an example using a metal sheet or the like surrounding a display module having a wide surface will be presented.

The invention also includes connecting means for accurate and reliable electrical contact with the object to extend the ground and technical considerations for it.

In the portable terminal according to the present invention configured as described above, since antennas capable of implementing diversity are arranged, radio characteristics are excellent. Furthermore, the provision of the ground extension minimizes the degradation of radio performance due to the weakening of the direct ground to the circuit board occupying a part of the terminal body.

According to an aspect of the present invention, such antennas are disposed inside a limited terminal, so it is advantageous to apply to a mobile terminal that is light and short.

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

1 is a schematic front perspective view of a portable terminal according to an embodiment of the present invention, and FIG. 2 is a schematic side perspective view of the portable terminal of FIG.

1 and 2, the portable terminal 100 has an external appearance and includes a terminal body 101 including various components. The terminal body 101 is provided with a display module 110 for outputting visual information. According to the trend of larger visual devices, an area of the display module 110 may be formed to occupy most of the terminal body 101. In contrast to the enlargement of the display module 110, the terminal body 101 may be manufactured in a thin and small form to increase the portability. In this case, since the space for the input device is narrowed, the display module 110 may be provided with a touch input device for touch.

Upper and lower corners of the display module 110 are provided with a first antenna 130 and a second antenna 140, respectively. The antennas 130 and 140 have a built-in type disposed inside the terminal body 101 to form a simple appearance. The first and second antennas 130 and 140 may display the display module 110 or the circuit board 120 to minimize interference from both corners of the terminal body 101, that is, other metal parts. It is preferable to be disposed on the side which reduces overlap with the back, thereby advantageously securing the distance L2 for diversity.

As shown in FIG. 2, the circuit board 120 mounting the components occupies a portion of the terminal body 101 to prevent overlapping with other components, which may be thick. In the adjacent area of the circuit board 120 occupying a portion, the power supply unit 160 for supplying power to the terminal 100 may be disposed on a similar plane without overlapping the circuit board 120.

One side of the display module 110 is provided with a ground extension 150 formed in parallel with the display module 110. The ground extension unit 150 is configured to directly connect the second antenna 140 and extends the ground of the circuit board 120.

The ground extension 150 may be formed in the form of a conductive sheet, and may utilize a conductive object having a wide surface mounted for another purpose. For example, when there is a metal sheet 154 for mounting the display module 110, the metal sheet 154 may be part of the ground extension 150. Therefore, as the ground extension 150 is miniaturized, the second antenna 140 may be spaced apart from the circuit board 120 having the ground at least a certain distance (L1), which may degrade performance. The problem can be minimized.

A connection member 153 is provided between the metal sheet 154 and the circuit board 120 to connect the metal sheet 154 to the ground of the circuit board 120. The connection member 153 may be various examples depending on the internal structure of the portable terminal 100.

In this way, by placing the antennas arranged at a distance L2 from each other, a fading signal in which a phase of a signal introduced through another path is inverted is canceled out (diversity gain). In addition, two antennas are used to obtain aperture gain and interference rejection gain.

This is useful in the band of High Speed Downlink Packet Access (HSDPA), or Universal Mobile Telecommunications System (UMTS), which requires high data rates. In particular, 3GPP (3rd Generation Partnership Project) Release 99 maximizes the operator's network efficiency, reduces call drop, saves the output of operator node B, and releases reduced output ( release) 6 Has the advantage of being used as an output for HSDPA.

In addition, it is required to implement a reception (RX) diversity function for the High Speed Physical Downlink Shared Channel (HS-PDSCH) and the High Speed Shared Control Channel (HS-SCCH), and supports HSDPA 7.2Mbps. The handset also complies with the recommendations of 3GPP Release 6, which recommends implementing equalizers to implement high-performance receivers.

3 is a front perspective view of a mobile terminal according to another embodiment of the present invention. Referring to FIG. 3, the portable terminal 200 includes a terminal body 201, and the terminal body 201 includes cases 203, 204, 205, and 206 forming casings, housings, and covers.

The cases 203, 204, 205, and 206 may be formed by injecting a synthetic resin or may have a metal material such as stainless steel (STS) or titanium (Ti).

The front case 203 may include a display module 210, a sound output unit 271, a first image input unit 278, or a first manipulation unit 272.

The display module 210 includes a liquid crystal display (LCD) module, an organic light emitting diode (OLED) module, and the like that visually express information. The display module 210 may further include a touch screen to enable input of information by a user's touch.

The sound output unit 271 may be implemented in the form of a receiver or a speaker.

The first image input unit 278 may be implemented in the form of a camera module for capturing an image or a video of a user.

The second manipulation unit 273, the sound input unit 280, and the external interface 277 may be disposed on the side surface of the terminal body 201.

The first and second manipulators 272 and 273 may be collectively referred to as manipulating portions, and may be employed in any manner as long as the user operates the tactile manner with a tactile feeling. For example, the operation unit may be implemented as a dome switch or a touch screen that can receive a command or information by a user's push or touch operation, a touch pad, a wheel that rotates keys, a jog method, or a method such as a joystick. It can also be implemented as.

In functional terms, the first operation unit 272 is for inputting a command such as start, end, scroll, and the like, and the second operation unit 273 performs hot functions for performing a special function such as activation of the first image input unit 278. It can act as a hot-key.

The sound input unit 280 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like.

The external interface 277 serves as a passage for allowing a portable terminal related to the present invention to exchange data with an external device. For example, the external interface 277 may be wired or wirelessly, and a connection terminal for connecting to an earphone, a port for short-range communication {for example, an infrared port (IrDA port), a Bluetooth port, a wireless LAN port ( wireless Lan port) or the like, or at least one of power supply terminals for supplying power to the mobile terminal 200.

The external interface 277 may be a card socket for receiving an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for storing information.

4 is a rear perspective view of the portable terminal of FIG. 3.

Referring to FIG. 4, a second image input unit 274 may be additionally mounted on the rear surface of the rear case 205. The second image input unit 274 may be a camera having a photographing direction substantially opposite to the first image input unit 278 and having different pixels from the first image input unit 278. For example, the first image input unit 278 has a low pixel so that it is easy to take a picture of a user and transmit it to a counterpart in a video call, and the second image input unit 274 immediately photographs a general subject. It is preferable to have a high pixel because it is not transmitted in many cases.

The flash 275 and the mirror 276 are further disposed adjacent to the second image input unit 274. The flash 275 shines light toward the subject when the subject is photographed by the second image input unit 274. The mirror unit 276 allows the user to see his / her own face or the like when the user wants to photograph himself (self-photographing) by using the second image input unit 274.

An audio output unit may be additionally disposed in the rear case 205. The added sound output unit may implement a stereo function together with the sound output unit 271 installed in the front case 203 and may be used for a call in the speakerphone mode.

An antenna 279 for receiving a broadcast signal may be disposed at one side of the terminal body 201. The antenna 279 may be installed to be pulled out from the terminal body 201.

Referring to FIG. 4, inside the terminal body 201, a first antenna 230 and a second antenna 240 arranged at a predetermined distance from the first antenna 230 to implement diversity of the first antenna are provided. It is built. In particular, the first antenna 230 and the second antenna 240 are disposed opposite to each other in the support member 204 to reduce the influence of other components and achieve diversity in the inside of the terminal body 201 having a limited size. You can expect ease of use.

5 is an exploded perspective view of the portable terminal of FIG. 3, FIG. 6 is an assembled sectional view of the portable terminal of FIG. 5, and FIG. 7 is an enlarged view of portion A of FIG. 6.

to be. Referring to these drawings, a support member 204 for supporting components is provided between the front case 203 and the rear case 205, and the display module 210 is provided on an upper mounting surface of the support member 204. The lower mounting surface of the support member 204 is provided with a circuit board 220 having a ground.

While the first antenna 230 is connected to the circuit board 220 to be supplied with power, the second antenna 240 is connected to the metal sheet 254 formed to surround the display module 210. .

The circuit board 220 forms part of the portable terminal 200, and a power supply unit 260 for supplying power to the portable terminal 200 is disposed on one side of the circuit board 220. Accordingly, the circuit board 220 and the power supply unit 260 do not overlap so that the portable terminal 200 can be slimmed.

The first antenna 230 includes a substrate 231 disposed on one side of the circuit board 220, a dielectric carrier 233 having a predetermined thickness from the substrate 231, and a conductive radiator patterned on the carrier 233. 232 is provided. As shown in FIG. 5, the first antenna 230 may be disposed to be spaced apart from the second image input unit 274. The first antenna 230 may be formed of a monopole antenna having a length such as a quarter wavelength, a half wavelength, and the like of the resonance frequency.

The radiator 232 may be formed in a form that is attached to the inner surface of the case 205 or molded. In this case, the power supply means may be formed on the circuit board 220 in the form of an elastic pin. 9 illustrates this example. That is, the radiator 332 constituting the first antenna 330 is formed on the inner surface of the case 305, the radiator 332 is connected by the elastic pin 334 fixed to the circuit board 320 to feed This is being done.

As shown in FIG. 5, the second antenna 240 includes a substrate 241 disposed on one side of the display module 210, a carrier 243 and a carrier 243 having a predetermined thickness from the substrate 241. And a patterned conductive radiator 242. The second antenna 240 may be configured to feed the circuit board 220 by a coaxial cable 245. In contrast, the second antenna 240 and the metal sheet 254 are directly connected to the extended ground of the circuit board 220 by being shorted by a cable or a flexible substrate 255.

The second antenna 240 may be a flat antenna or a modified form thereof, such as a flat inverted-F antenna (PIFA). Unlike the case where the image input units 278 and 274 are disposed at the upper end, the second antenna 240 can secure a larger size than the first antenna 230, which is advantageous for low band antennas. The second antenna 240 may be configured as a multi-resonant antenna, and diversity may be implemented for the specific band by making at least one band (specific band) of the second antenna 240 the same as the band of the first antenna 230.

The second antenna 240 may also be formed to be attached or molded to the case 205.

As shown in FIG. 6, the metal sheet 254 surrounding the rear surface of the display module 210 is grounded to the ground of the circuit board 220 to extend the ground. To this end, as shown in FIG. 5, the mounting surface on which the circuit board 220 of the support member 204 is mounted and the mounting surface on which the display module 210 is mounted are communicated by the through hole 252.

The through hole 252 passes through a connecting member 253 disposed at both ends thereof to contact the ground pad 251 and the metal sheet 254 of the circuit board 220.

As shown in FIG. 7, a conductive electromagnetic interference (EMI) blocking material is coated on the mounting surface on which the circuit board 220 is mounted, and the EMI blocking material is connected to the ground of the circuit board 220 that is in contact.

A hook 211 is formed at the edge of the mounting surface on which the display module 210 is mounted to press and fix the display module 210 so that the metal sheet 254 is in close contact with the connection member 253. Therefore, excellent grounding of the metal sheet 254 can be ensured.

As shown in Figure 5, the connection member 253 is preferably mounted in a plurality of positions spaced from each other for sure grounding. The connection member 253 may be formed in the form of a fiber or conductive tape woven from a conductive metal. The connection member 253 may be formed in an elastic shape.

8 is a cross-sectional view showing a modification of the ground extension according to the present invention. Referring to FIG. 8, the mounting surface on which the circuit board 420 of the support member 404 is mounted includes a protrusion 404a protruding toward a ground pad formed on the circuit board, and the protrusion 404a is molded. A metal boss 453b is molded.

Conductive tape or pads 453a and 453c are attached to both ends of the boss 453b, which enhances contact between the circuit board 420 and the metal sheet 454.

The concept of ground extension of an antenna device for implementing diversity of a mobile terminal according to the present invention is not limited to the bar type shown in FIGS. 1 to 6, but may be applied to various structures such as a slide type, a folder type, a swing type, and the like. Do.

10 is a block diagram of a portable terminal according to the present invention.

An example of the present invention is shown in the wireless communication module 591, the operation unit 572, the image input unit 574, the sound input unit 580, the display module 510, the sound output unit 571, the external interface 577, And a broadcast receiving module 595, a memory 594, a power supply unit 560, and a control unit 590.

The controller 590 typically controls the overall operation of the mobile terminal. For example, perform related control and processing for voice calls, data communications, video calls, and the like.

The wireless communication module 591 transmits / receives a radio signal with the mobile communication base station through the first and second antennas 530 and 540. For example, under the control of the controller 590, the transmitter 592 is responsible for transmitting and receiving voice data, text data, video data, and control data, and modulates and transmits a signal to be transmitted, and a receiver for demodulating the received signal. 592).

The operation unit 572 is configured as shown in FIG. 1 to provide the control unit 590 with key input data input by the user for controlling the operation of the terminal. The operation unit 572 is composed of a dome switch, a touch pad (static pressure / capacitance), a jog wheel, a jog switch, and the like.

The image input unit 574 processes an image frame such as a still image or a moving image obtained by the image sensor in a video call mode or a photographing mode. The processed image frame is converted into image data displayable on the display module 510 and output to the display module 510.

The image frame processed by the image input unit 574 is stored in the memory 594 under the control of the control unit 590 or transmitted to the outside through the wireless communication module 591.

The sound input unit 580 receives an external sound signal by a microphone in a call mode, a recording mode, a voice recognition mode, etc., and processes the external sound signal into electrical voice data. The processed voice data is converted into a form transmittable to the mobile communication base station through the wireless communication module 591 in the communication mode, and is output to the wireless communication module. In the recording mode, the processed voice data is output to be stored in the memory 594.

The sound input unit 580 may implement various noise removing algorithms for removing noise generated in the process of receiving an external sound signal.

The display module 510 displays and outputs information processed by the mobile terminal. For example, when the mobile terminal is in a call mode, the control unit 590 displays and outputs a user interface (UI) or a graphic user interface (GUI) related to the call. When the mobile terminal is in a video call mode or a photographing mode, the mobile terminal displays and outputs a captured image, a UI, and a GUI under the control of the controller 590. When the display module 510 is configured to include a touch screen, the display module 510 is used as an input device in addition to the output device.

The sound output unit 571 is provided to the sound data or memory 594 received from the wireless communication module 591 under the control of the control unit 590 in a call signal reception, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, and the like. The stored sound data is converted and output to the outside.

In addition, the sound output unit 571 outputs a sound signal related to a function (for example, a call signal reception sound, a message reception sound, etc.) performed in the portable terminal. The sound output unit 571 may include a speaker, a receiver, a buzzer, and the like.

The external interface 577 may connect any mobile / wireless headset, external charger, wire / wireless data port, card socket (for example, a memory card or a SIM / UIM card) to the mobile terminal in addition to the mobile terminal. It serves as an interface with external devices. The external interface 577 receives data or power from an external device and transmits the data to each component inside the mobile terminal or transmits data within the mobile terminal to the external device.

The memory 594 may store a program for processing and controlling the control unit 590, and provides a function for temporarily storing input / output data (for example, a phone book, a message, a still image, a video, etc.). It can also be done.

In addition, the memory 594 stores various multimedia contents, system information, or programs under the control of the controller 590. This memory 594 includes generally known concepts such as hard disks, card type memory (eg SD or XD memory, etc.), flash memory, RAM, ROM, and the like.

The broadcast receiver 595 receives a broadcast signal transmitted through a satellite or terrestrial wave, converts the broadcast signal into a broadcast data format that can be output to the sound output unit 571 and the display module 510, and outputs the broadcast signal to the controller 590. In addition, the broadcast receiving unit 595 receives additional data related to the broadcast (for example, an EPG (electric program guide), a channel list, etc.). The broadcast data and the additional data converted by the broadcast receiving unit 571 may be stored in the memory 594.

The power supply unit 560 receives an external power source and an internal power source under the control of the controller 590 to supply power for operation of each component.

Since the first antenna 530 and the second antenna 540 constituting the wireless communication module 591 are arranged at a predetermined distance from each other as described above, fading in which the phase of a signal introduced through another path is reversed. Fading improves radio characteristics by reducing the cancel out of the signal. In particular, as described above, it is also advantageous to minimize the power supply of the power supply unit 560 in the band of High Speed Downlink Packet Access (HSDPA) or Universal Mobile Telecommunications System (UMTS).

The above-described portable terminal is not limited to the configuration and method of the embodiments described above, but may be configured by selectively combining all or some of the embodiments so that various modifications can be made.

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

2 is a schematic side perspective view of the portable terminal of FIG. 1;

3 is a front perspective view of a mobile terminal according to another embodiment of the present invention;

4 is a rear perspective view of the portable terminal of FIG. 3;

5 is an exploded perspective view of the portable terminal of FIG. 3;

6 is an assembly cross-sectional view of the mobile terminal of FIG. 5;

7 is an enlarged view of a portion A of FIG. 6;

8 is a cross-sectional view showing a modification of the ground expansion unit related to the present invention;

9 is a cross-sectional view showing a modification of the antenna related to the present invention,

10 is a block diagram of a portable terminal according to the present invention.

Claims (10)

A terminal body having a circuit board on which ground is formed; A first antenna disposed on one side of the circuit board to feed the circuit board; A second antenna disposed at a predetermined distance from the first antenna to implement diversity of the first antenna; And And a ground extension configured to directly connect the second antenna and to extend the ground of the circuit board. The method of claim 1, The terminal body includes a support member for supporting parts, the support member, A first mounting surface on which the circuit board is mounted; And And a display module for displaying visual information, the display module including a second mounting surface positioned opposite to the first mounting surface. The method of claim 2, wherein the ground extension portion, A connection member disposed to pass between the first mounting surface and the second mounting surface; And The mobile terminal is in close contact with the second mounting surface, and comprises a metal sheet formed to surround the display module. The method of claim 3, The edge of the second mounting surface is a portable terminal, characterized in that the hook for pressing and fixing the display module so that the metal sheet is in close contact with the connection member. The method of claim 3, A conductive terminal (EMI) blocking material is coated on the first mounting surface, and the connection member is in contact with the EMI blocking material. The method of claim 3, The first mounting surface of the support member includes a protrusion protruding toward the ground pad formed on the circuit board, And a passage hole is formed in the protrusion to allow the connection member to pass therethrough. The method of claim 6, The connection member is a portable terminal, characterized in that formed in the form of a boss (metal) molded in the passage hole. The method of claim 3, The second antenna includes a short pin shorted to the metal sheet and a feeding pin to feed the circuit board. The feeder is formed in the form of a coaxial cable is connected to the circuit board, characterized in that the portable terminal. The method of claim 3, And a third mounting surface is formed between the circuit board and the second antenna, and a power supply unit is mounted on the third mounting surface. A support member disposed inside the terminal body and having components fixed thereto; A circuit board mounted on the first mounting surface of the support member and having a smaller area than the support member; A first antenna disposed on one side of the circuit board to feed the circuit board; A second antenna disposed at a predetermined distance from the first antenna to implement diversity of the first antenna; And And a conductive metal sheet positioned on a second mounting surface different from the first mounting surface of the support member and extending from the ground of the circuit board to directly connect the second antenna.

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