KR101726226B1 - Mobile terminal - Google Patents

Abstract

A first antenna unit mounted on the main body and configured to transmit and receive a multi-band radio signal; a circuit board electrically connected to the first antenna unit to process the radio signal; A second antenna unit coupled to the first antenna unit to reduce a Specific Absorption Rate (SAR), the first antenna unit being spaced apart from the first antenna unit by a predetermined distance and having a resonance frequency corresponding to at least one of the transmit frequencies of the first antenna unit; And a second antenna unit formed to have a first antenna and a second antenna.

Description

[0001] MOBILE TERMINAL [0002]

The present invention relates to a mobile terminal including an antenna unit for transmitting and receiving a radio signal.

The terminal can move And can be divided into a mobile / portable terminal and a stationary terminal depending on whether the mobile terminal is a mobile terminal or a mobile terminal. The mobile terminal can be divided into a handheld terminal and a vehicle mount terminal according to whether the user can directly carry the mobile terminal.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

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

In addition, mobile terminals are regarded as personal items for expressing their individuality, and various design forms are required. The design form also includes structural changes and improvements for the user to use the mobile terminal more conveniently. One of such structural changes and improvements can be considered for the antenna device.

It is an object of the present invention to provide a mobile terminal having an antenna unit with improved performance.

It is another object of the present invention to provide an antenna unit in which a Specific Absorption Rate (SAR) is reduced and a mobile terminal having the antenna unit.

In order to achieve the above object, a mobile terminal according to the present invention comprises a terminal body, a first antenna unit mounted on the main body and configured to transmit and receive multi-band radio signals, And a second antenna unit coupled to the first antenna unit and spaced apart from the first antenna unit by a predetermined distance so as to reduce a Specific Absorption Rate (SAR) And a second antenna unit formed to have a resonance frequency corresponding to at least one of the transmit frequencies of one antenna unit.

In one embodiment of the present invention, the second antenna unit includes a dummy antenna unit configured to process a radio signal corresponding to the resonance frequency. All the connection paths for electrically connecting the dummy antenna unit and the circuit board may be connected to the ground. When the second antenna unit is detached from the main body and mounted on the main body, the second antenna unit may change the absorption rate of the electromagnetic wave more than the gain of the first antenna unit.

As another example of the present invention, the first antenna unit may include a first radiator configured to transmit a multi-band radio signal, and the second antenna unit may include a conductive pattern . The second antenna unit includes a ground arm and a dummy feed arm. The ground arm extends from the conductive pattern and is grounded to the circuit board. The dummy feed arm is grounded to the circuit board so that the second antenna unit is in the form of a flat FFE (PIFA) antenna, do.

In another embodiment of the present invention, the predetermined distance may be 1/8 to 1/2 of the wavelength corresponding to the resonance frequency. The gain of the second antenna unit may be 1% to 10% of the gain of the first antenna unit so that the coupling of the first and second antenna units does not affect the performance of the first antenna unit. The transmission frequencies of the first antenna unit may include a frequency band corresponding to at least one of a personal communication system (PCS), an advanced wireless service (AWS), and a digital communications network (DCN).

According to another embodiment of the present invention, the second antenna unit includes a second radiator for transmitting and receiving a radio signal of a frequency band different from that of the multi-band, and a second radiator extending from the second radiator, And a conductive pattern formed to have a resonance frequency corresponding to one of the conductive patterns. The second radiator and the conductive pattern are electrically connected to the circuit board, respectively. The circuit board processes the radio signals transmitted and received by the second radiator, and does not process radio signals received in the conductive pattern.

According to another embodiment of the present invention, the first antenna portion is disposed adjacent to one end of the main body, and the second antenna portion is formed to be perpendicular to the first antenna portion. The main body is formed with a receiving portion in which a battery can be received, and the first antenna portion and the second antenna portion are disposed adjacent to perpendicular corners of the receiving portion, respectively.

According to another aspect of the present invention, there is provided a wireless communication system including a terminal body, a first antenna unit mounted to the main body and configured to transmit and receive multi-band radio signals, and a second antenna unit disposed apart from the first antenna unit, And a circuit board electrically connected to the first antenna unit and the second antenna unit to process the multi-band and single-band radio signals, wherein the second antenna unit receives the radio signal of the single band And a transmission pattern including a conductive pattern having a resonance frequency corresponding to at least one of the transmission frequencies of the antenna section, the transmission pattern being coupled with the antenna section to reduce a specific absorption rate (SAR) The terminal is started.

As another example related to the present invention, the conductive pattern extends from the auxiliary radiator toward the first antenna portion so that one end thereof is spaced apart from the first antenna portion by a predetermined distance. The auxiliary radiating element is grounded and fed to the circuit board, and the conductive pattern may be grounded to the circuit board between the grounding and power feeding connection portions of the auxiliary radiating element. The circuit board may be formed to process the radio signal received in the conductive pattern.

According to another aspect of the present invention, there is provided a wireless communication system including a terminal body, an antenna unit disposed adjacent to one end of the body and configured to transmit and receive a radio signal, a circuit board electrically connected to the antenna unit, And a conductive pattern formed to be perpendicular to the antenna unit along one corner of the main body so as to reduce a Specific Absorption Rate (SAR) coupled to the main body but not fed from the circuit board. present.

As another example related to the present invention, the antenna portion includes a radiator and a carrier. The radiator is formed to vary width at least in part to transmit and receive multi-band radio signals, and is spaced from a predetermined distance from one end of the conductive pattern. The carrier is formed to mount the radiator, and is disposed adjacent to one end of the main body. The conductive pattern may be formed to have a resonant frequency corresponding to at least one of the transmission frequencies of the antenna unit.

According to the present invention, a conductive pattern constituting the dummy antenna is disposed adjacent to the main antenna, thereby implementing a mechanism for reducing the specific absorption rate (SAR) without affecting the gain of the main antenna. In addition, the tuning for reducing the absorption rate of the electromagnetic wave human body is facilitated through this.

Also, as the absorption rate of the electromagnetic wave body is reduced by a separate auxiliary antenna, the main antenna can be universally applied to different mobile terminals.

Further, according to the present invention, by using a conductive pattern arranged perpendicularly to the main antenna, the absorption rate of the electromagnetic wave body can be reduced without increasing the volume of the mobile terminal.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.
FIG. 2A is a perspective view of an example of a mobile terminal according to the present invention. FIG.
FIG. 2B is a rear perspective view of the portable terminal shown in FIG. 2A. FIG.
Figure 3 is an exploded view of the mobile terminal of Figure 2b.
4A is an enlarged view of the circuit board and the antenna device of Fig.
FIG. 4B is a partial view showing a state in which the first and second antenna units are mounted to the rear case in FIG. 3; FIG.
5A and 5B are rear perspective views of the first and second antenna portions, respectively.
6 is a conceptual view showing an electrical connection path of a second antenna unit;
7 is a graph showing the performance of the antenna device of FIG. 3;
FIG. 8 is a distribution diagram showing a change in the absorption rate of an electromagnetic wave body by the second antenna unit in FIG. 3; FIG.
9A and 9B are a perspective view and a performance graph showing a modified example of the second antenna unit of FIG.
10 is an exploded view showing another example of a mobile terminal according to the present invention.
Fig. 11 is an enlarged view of the circuit substrate and the antenna device of Fig. 10; Fig.
FIG. 12 is a conceptual diagram showing a case where a conductive pattern is removed in the antenna device of FIG. 11;
13 is a graph showing the performance of the antenna device of FIG. 12;

Hereinafter, a mobile terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and navigation.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

The mobile terminal 100 includes a wireless communication unit 110, an audio / video input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, A controller 170, a controller 180, a power supply 190, and the like. The components shown in FIG. 1 are not essential, and a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The wireless communication unit 110 may include one or more modules for enabling wireless communication between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and the network in which the mobile terminal 100 is located. For example, the wireless communication unit 110 may include a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short range communication module 114, and a location information module 115 .

The broadcast receiving module 111 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast-related information may exist in various forms. For example, an EPG (Electronic Program Guide) of DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of Digital Video Broadcast-Handheld (DVB-H).

For example, the broadcast receiving module 111 may be a Digital Multimedia Broadcasting-Terrestrial (DMB-T), a Digital Multimedia Broadcasting-Satellite (DMB-S), a Media Forward Link Only And a Digital Broadcasting System (ISDB-T) (Integrated Services Digital Broadcast-Terrestrial). Of course, the broadcast receiving module 111 may be adapted to other broadcasting systems as well as the digital broadcasting system described above.

The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 112 transmits and receives radio signals to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 is a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 100. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short-range communication module 114 refers to a module for short-range communication. Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like can be used as a short range communication technology.

The position information module 115 is a module for obtaining the position of the mobile terminal, and a representative example thereof is a Global Position System (GPS) module.

Referring to FIG. 1, an A / V (Audio / Video) input unit 120 is for inputting an audio signal or a video signal, and may include a camera 121 and a microphone 122. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display module 151. [

The image frame processed by the camera 121 may be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ Two or more cameras 121 may be provided depending on the use environment.

The microphone 122 receives an external sound signal through a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 112 when the voice data is in the call mode, and output. Various noise reduction algorithms may be implemented in the microphone 122 to remove noise generated in receiving an external sound signal.

The user input unit 130 generates input data for a user to control the operation of the terminal. The user input unit 130 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The sensing unit 140 senses the current state of the mobile terminal 100 such as the open / close state of the mobile terminal 100, the position of the mobile terminal 100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 100. For example, when the mobile terminal 100 is in the form of a slide phone, it is possible to sense whether the slide phone is opened or closed. It is also possible to sense whether the power supply unit 190 is powered on, whether the interface unit 170 is connected to an external device, and the like. Meanwhile, the sensing unit 140 may include a proximity sensor 141.

The output unit 150 is for generating output related to visual, auditory or tactile sense and includes a display module 151, an acoustic output module 152, an alarm unit 153, and a haptic module 154 .

The display module 151 displays (outputs) information processed by the mobile terminal 100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display module 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, and a 3D display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display module 151 may also be of a light transmission type. With this structure, the user can see an object located behind the terminal body through the area occupied by the display module 151 of the terminal body.

There may be two or more display modules 151 according to the embodiment of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display modules may be spaced apart or integrally arranged on one surface, and may be disposed on different surfaces, respectively.

(Hereinafter, referred to as a 'touch screen') in which the display module 151 and the sensor for sensing the touch operation (hereinafter, referred to as 'touch sensor') have a mutual layer structure, It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display module 151 or a capacitance generated in a specific portion of the display module 151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display module 151 is touched or the like.

Referring to FIG. 1, a proximity sensor 141 may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is surrounded by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch & The act of actually touching the pointer on the screen is called "contact touch. &Quot; The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.

The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.

The audio output module 152 may output audio data received from the wireless communication unit 110 or stored in the memory 160 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. [ The audio output module 152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 153 outputs a signal for notifying the occurrence of an event of the mobile terminal 100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 153 may output a signal for notifying the occurrence of an event in a form other than the video signal or the audio signal, for example, vibration. The video signal or the audio signal may be output through the display module 151 or the audio output module 152 so that they may be classified as a part of the alarm unit 153. [

The haptic module 154 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 154 is vibration. The intensity and pattern of the vibration generated by the hit module 154 can be controlled. For example, different vibrations may be synthesized and output or sequentially output.

In addition to the vibration, the haptic module 154 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or a suction force of the air through the injection port or the suction port, a touch on the skin surface, contact with an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 154 can be implemented not only to transmit the tactile effect through the direct contact but also to allow the user to feel the tactile effect through the muscular sensation of the finger or arm. The haptic module 154 may include two or more haptic modules 154 according to the configuration of the portable terminal 100.

The memory 160 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 160 may store data on vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), a RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM A disk, and / or an optical disk. The mobile terminal 100 may operate in association with a web storage that performs a storage function of the memory 160 on the Internet.

The interface unit 170 serves as a path for communication with all external devices connected to the mobile terminal 100. The interface unit 170 receives data from an external device or supplies power to each component in the mobile terminal 100 or transmits data to the external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 170.

The identification module is a chip for storing various information for authenticating the use right of the mobile terminal 100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module A Universal Subscriber Identity Module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the port.

When the mobile terminal 100 is connected to an external cradle, the interface unit may be a path through which power from the cradle is supplied to the mobile terminal 100, or various command signals input by the user to the cradle may be transmitted It can be a passage to be transmitted to the terminal. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal is correctly mounted on the cradle.

The controller 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like. The control unit 180 may include a multimedia module 181 for multimedia playback. The multimedia module 181 may be implemented in the control unit 180 or may be implemented separately from the control unit 180. [

The controller 180 may perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touch screen as characters and images, respectively.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components.

The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

According to a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays May be implemented using at least one of processors, controllers, micro-controllers, microprocessors, and other electronic units for performing other functions. In some cases, May be implemented by the control unit 180.

According to a software implementation, embodiments such as procedures or functions may be implemented with separate software modules that perform at least one function or operation. The software code may be implemented by a software application written in a suitable programming language. The software codes are stored in the memory 160 and can be executed by the control unit 180. [

2A is a perspective view of a mobile terminal according to an embodiment of the present invention, and FIG. 2B is a rear perspective view of the mobile terminal shown in FIG. 2A.

The disclosed mobile terminal 200 has a bar-shaped mobile phone body. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, a swing type, and a swivel type in which two or more bodies are relatively movably coupled.

The body includes a case (a casing, a housing, a cover, and the like) which forms an appearance. In this embodiment, the case may be divided into a front case 201 and a rear case 202. [ Various electronic components are embedded in the space formed between the front case 201 and the rear case 202. At least one intermediate case may be additionally disposed between the front case 201 and the rear case 202. [

The cases may be formed by injection molding a synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

A display module 251, an audio output unit 252, a camera 221, user input units 230/231 and 232, a microphone 222, and an interface 270 may be disposed in the front body 201 have.

The display module 251 occupies most of the main surface of the front case 201. A sound output unit 252 and a camera 221 are disposed in an area adjacent to one end of both ends of the display module 251 and a user input unit 231 and a microphone 222 are disposed in an area adjacent to the other end. The user input unit 232 and the interface 270 may be disposed on the side surfaces of the front case 201 and the rear case 202.

The user input unit 230 is operated to receive a command for controlling the operation of the portable terminal 200 and may include a plurality of operation units 231 and 232. The operation units 231 and 232 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.

The contents inputted by the first or second operation units 231 and 232 can be variously set. For example, the first operation unit 231 receives commands such as start, end, scroll, and the like, and the second operation unit 232 controls the size of the sound output from the sound output unit 252, To the touch recognition mode of the touch screen. The display module 251 forms a touch screen together with the touch sensor, and the touch screen may be an example of the user input unit 230. [

Referring to FIG. 2B, a camera 221 'may be further mounted on the rear surface of the terminal body, that is, the rear case 202. The camera 221 'may have a photographing direction substantially opposite to the camera 221 (see FIG. 2A), and may be a camera having different pixels from the camera 221.

For example, the camera 221 has a low pixel so that it is easy to capture a face of a user in the case of a video call or the like and transmits the face to the other party, and the camera 221 ' It is preferable to have a large number of pixels. The cameras 221 and 221 'may be installed in the terminal body such that they can be rotated or pop-up.

A flash 223 and a mirror 224 are additionally disposed adjacent to the camera 221 '. The flash 223 illuminates the subject when the subject is photographed by the camera 221 '. The mirror 224 allows the user to illuminate the user's own face or the like in the case where the user intends to photograph (self-photograph) himself / herself using the camera 221 '.

An acoustic output may be additionally disposed on the rear surface of the terminal body. The rear audio output unit may implement a stereo function together with the front audio output unit 252 (see FIG. 2A), and may be used for implementing a speakerphone mode during a call.

A power supply unit 290 for supplying power to the portable terminal 200 is mounted on the terminal body. The power supply unit 290 may be built in the terminal body or may be detachable from the outside of the terminal body.

The rear case 202 may further include a touch sensor 235 for sensing a touch. The touch sensor 235 may also be of a light transmission type like the display module 251. In this case, if the display module 251 is configured to output time information on both sides, the time information can be recognized through the touch sensor 235 as well. The information output on the both sides may be all controlled by the touch sensor 235. Alternatively, the touch sensor 235 may be further equipped with a display, and the touch screen may be disposed in the rear case 202 as well.

The touch sensor 235 operates in correlation with the display module 251 of the front case 201. [ The touch sensor 235 may be disposed parallel to the rear of the display module 251. The touch sensor 235 may have the same or smaller size as the display module 251.

An antenna for a call or the like may be mounted on the terminal body, and an antenna for receiving a broadcast signal may be additionally disposed.

These antennas are combined with each other to form an antenna device that integrally provides various communication services. The mobile terminal of the present invention has a mechanism for reducing the Specific Absorption Rate (SAR) by the antenna device. Hereinafter, the antenna device and the reduction mechanism will be described in more detail with reference to FIG. 3 to FIG.

Figure 3 is an exploded view of the mobile terminal of Figure 2b.

Referring to this figure, a circuit board 281 is embedded in the terminal body. The circuit board 281 may be mounted on, for example, the front case 201 or the rear case 202, or may be mounted on a separate internal structure. According to the drawing, the circuit board 281 is disposed so as to be covered by the inner surface of the rear case 202.

Various electronic elements are mounted on one surface of the circuit board 281, and a shield member 282 for protecting the electronic elements is mounted on the one surface. The shield member 282 may be made of, for example, a metal plate material.

The circuit board 281 may be configured as an example of a controller 180 (see FIG. 1) for operating various functions of the mobile terminal. A plurality of circuit boards 281 are provided and can perform the function of the controller 180 by combining them. The circuit board 281 is electrically connected to the antenna device and is configured to process radio signals corresponding to radio electromagnetic waves transmitted and received by the antenna device.

Referring to this figure, a recessed receptacle 242 is formed in the rear case 202 so that the battery 241 can be received. The bottom of the accommodating portion 242 penetrates through which the shield member 282 is exposed. According to this structure, the shield member 282 forms the bottom of the receiving portion 242. The battery 241 and the accommodating portion 242 may be configured as an example of the power supply unit 290 (see FIG. 2B).

The battery cover 203 is mounted on the rear case 202 so as to cover the battery 241 and the accommodating portion 242. The battery cover 203 is provided as an example of a case that forms an outer appearance of the terminal body, and covers the entire rear surface of the terminal.

According to the illustration, the antenna apparatus includes a plurality of antenna units 260 and 270.

One of the plurality of antenna units 260 and 270 is disposed adjacent to one end of the terminal body and is mainly composed of a Global Positioning System (GPS), a Media Forward Link Only (MediaFLO) For example. It is configured to transmit and receive multi-band radio signals and can be configured as a main antenna unit of a mobile terminal. Hereinafter, such a main antenna unit will be referred to as a first antenna unit 260.

The other one of the plurality of antenna units 260 and 270 is formed to be perpendicular to the first antenna unit 260 and the Specific Absorption Rate (SAR) generated by the first antenna unit 260 . This may be, for example, a dummy antenna portion having an antenna shape or not transmitting / receiving a radio signal. Hereinafter, such a dummy antenna unit will be referred to as a second antenna unit 270.

More specifically, the antenna mount portion 244 is formed at a portion of the rear case 202 adjacent to one corner of the accommodating portion 242. The antenna mount part 244 is configured to allow the first antenna part 260 to be seated. The antenna mount part 244 is formed to cover at least a part of the circuit board 281 and the antenna mount part 244 is provided at the bottom of the antenna mount part 244 for electrical connection between the first antenna part 260 and the circuit board 281 A through hole 245 is formed.

The second antenna portion 270 is disposed at a corner perpendicular to one corner of the receiving portion 242. In the illustrated embodiment, the second antenna unit 270 is disposed on one side of the terminal body, but the present invention is not limited thereto. For example, a plurality of second antenna units 270 may be disposed on both sides of the terminal body.

More specifically, the conductive pattern 271 is disposed to be perpendicular to the first antenna unit 260 along one corner of the terminal body, and the conductive pattern 271 may be a part of the second antenna unit 270 . The conductive pattern 271 is formed so as not to supply a signal from the circuit board 281 and is coupled with the first antenna unit 260 to reduce the Specific Absorption Rate (SAR).

Hereinafter, the structure and function of the antenna device in which the specific absorption rate of electromagnetic waves can be reduced will be described in more detail.

FIG. 4A is an enlarged view of the circuit board 281 and the antenna device of FIG. 3, FIG. 4B is a partial view showing the first and second antenna units mounted on the rear case in FIG. 3, 6 is a conceptual diagram showing an electrical connection path of the second antenna unit, FIG. 7 is a graph showing the performance of the antenna apparatus of FIG. 3, and FIG. 8 is a graph showing the performance of the second antenna unit of FIG. Fig. 6 is a distribution diagram showing a change in the absorption rate of an electromagnetic wave body by the antenna portion. Fig.

Referring to FIG. 4A with reference to FIG. 3, the first antenna portion 260 includes a carrier 261 (hereinafter referred to as a "first carrier") and a radiator 262 (hereinafter referred to as a "first radiator"). The first carrier 261 is formed to be seated on the antenna seat 244 and is detachably mounted on the outer surface of the rear case 202 and disposed adjacent to one end of the terminal body. The first carrier 261 can be standardized to be applicable regardless of the type of terminal. Also, the first carrier 261 can be covered by the battery cover 203 while being mounted on the outer surface of the rear case 202. As described above, since the first carrier 261 is covered only by the battery cover 203, the transmission / reception performance of the antenna can be improved.

A first radiator 262 is disposed on one surface of the first carrier 261. The first radiator 262 has a predetermined pattern of conductive material and is electrically connected to the circuit board 281 so that the transmitted and received radio signals are processed.

4A, 4B and 5A, the first radiator 262 extends on the other surface (the surface facing the bottom of the seating portion) of the first carrier 261 and extends from the first radiator 262 to the circuit board And the grounding and power feeding terminals 263a and 263b are protruded in the direction toward the electrodes 281 and 281. The ground and power supply terminals 263a and 263b are electrically connected to the circuit board 281, respectively. For this purpose, the circuit board 281 may be provided with a connection terminal 283.

The first radiator 262 is configured to transmit and receive radio electromagnetic waves of a specific frequency band, and the frequency band may include at least one of a personal communication system (PCS), an advanced wireless service (AWS), and a digital communications network As shown in Fig.

According to the illustration, the first radiator 262 is configured to transmit and receive multi-band radio signals. That is, the first antenna unit 260 may be a multi-band antenna. For example, the first radiator 262 includes first and second radiation patterns 262a, 262b that are diverged about the ground and power feed terminals 263a, 263b. The first and second radiation patterns 262a and 262b may be formed, for example, by printing a conductive ink on the surface of the first carrier 261 and plating the conductive ink with a metal.

For example, the first radiation pattern 262a transmits and receives radio signals in the DCN frequency band, and the second radiation pattern 262b is formed to transmit and receive wireless signals in the AWS and PCS frequency bands. The second radiation pattern 262b is made to vary in width at least in part 264 to transmit and receive multi-band radio signals in one pattern.

4A and 4B, the second antenna unit 270 is separated from the first antenna unit 260 by a predetermined distance. More specifically, the first radiator 262 is spaced from the one end of the conductive pattern 271 by a predetermined distance. The separation distance d1 may be 1/8 to 1/2 of the wavelength corresponding to the resonance frequency of the conductive pattern 271, for example. The conductive pattern 271 shown in this drawing shows a case where it is 1/2 of the wavelength. If the conductive pattern 271 is close to the first radiator 262, the first and second antenna portions 260 and 270 may cause resonance. However, according to the distance illustrated in the present invention, The antenna units 260 and 270 can be coupled without resonance. The conductive pattern 271 extends toward the first antenna unit 260 in order to form the separation distance d1 and then extends in a direction away from the first antenna unit 260 again.

The conductive pattern 271 is formed so as to have a resonant frequency corresponding to at least one of the transmission frequencies of the first antenna unit 260. For example, the conductive pattern 271 is made to have a resonance frequency corresponding to the PCS transmission frequency. In addition, the conductive pattern 271 forms a dummy antenna portion in which a radio signal corresponding to the resonance frequency is not processed. That is, the conductive pattern 271 is electrically connected to the circuit board 281, but the circuit board 281 is formed so as not to process the wireless signal received through the conductive pattern 271. In this example, the conductive pattern 271 is disposed adjacent to the first radiation pattern 262a, but the present invention is not limited thereto. The conductive pattern 271 may be disposed adjacent to the second radiation pattern 262b to increase the degree of coupling. The conductive pattern 271 may be disposed on one side of the accommodating portion 242 but in this case it may be disposed on the opposite side of the accommodating portion 242 of the conductive pattern 271. [

The second antenna portion 270 has a second carrier 272 on which the conductive pattern 271 is seated and the second carrier 272 is disposed perpendicular to the first carrier 271. [ As shown, the second carrier 272 forms one side of the receiving portion 242, through which the volume of the terminal can be made compact.

The conductive pattern 271 may be formed of a metal thin plate such as gold or copper and is electrically connected to the circuit board 281 through the second carrier 272. [ However, the present invention is not limited thereto, and the conductive pattern 271 may be formed in the same manner as the first radiator 262.

Referring to FIGS. 4A, 4B, and 5B, the second antenna unit 270 includes a ground arm 273 and a dummy feed arm 274.

The ground arm 273 extends from the conductive pattern 271 and is grounded to the circuit board 281. The dummy feed arm 274 is electrically connected to the circuit board 281 as if it were a feed connection of a PIFA antenna, in the form of a flat FEF (PIFA) antenna. The circuit board may be provided with a connection terminal 284 which is in contact with the ground arm 273 and the dummy feed arm 274 for grounding and power feeding connection. However, since the circuit board 281 does not process radio signals, there is no signal feed from the circuit board 281 to the dummy feed arm 274, so that the second antenna unit 270 forms a dummy antenna unit. Since the second antenna portion 270 does not act as an actual antenna, the volume of the second carrier 272 can be very small, so that the terminal can be made compact in size.

Referring to FIG. 6, all connection paths for electrically connecting the second antenna unit 270 to the circuit board 281 are connected to a ground 275. The ground 275 may be formed in a specific layer of the circuit board 281, or may be disposed as a separate conductor within the terminal. The conductive pattern 271 is connected to the ground 275 formed on the circuit board 281 via the connection terminal 284 on the circuit board 281 in the embodiment of the present invention. But is not limited thereto. For example, the conductive pattern 271 may be directly grounded to a separate conductor disposed within the terminal. In this case, the second antenna unit 270 is directly grounded to the ground 275.

The second antenna unit 270 and the circuit board 281 are electrically connected by the ground arm 273 and the dummy feed arm 274 so that the connection path is the ground arm 273 and the dummy feed arm 274 . According to the drawing, not only the ground arm 273 is connected to the ground 275, but also the dummy feed arm 274 is also connected to the ground 275. Consequently, the dummy feed arm 274 is grounded to the circuit board 281.

There is no signal processing unit for transmitting a signal to the dummy feed arm 274 on the circuit board 281 so that a dummy antenna in the form of a PIFA antenna with no signal feed from the circuit board 281 to the conductive pattern 271 An additional portion may be formed.

Referring to FIGS. 7 and 8, when the second antenna unit 270 is detached from the terminal body and is mounted on the body, the specific absorption rate of the electromagnetic wave is changed more than the gain of the first antenna unit 260. That is, since the second antenna unit 270 is a dummy antenna unit and sufficiently spaced from the first antenna unit 260, the gain of the first antenna unit 260 is hardly affected, and the electromagnetic wave absorption rate is reduced . In addition, since the conductive pattern 271 has a resonance frequency corresponding to one of the transmission frequencies of the first antenna unit 260, reduction of the electromagnetic wave absorption rate due to transmission may be noticeably reduced.

More specifically, the gain of the second antenna unit 270 may be 1% (-20 dB) to 10% (-10 dB) of the gain of the first antenna unit 260. Accordingly, the gain of the first antenna unit 260 toward the second antenna unit 270 is reduced by 1% to 10%, but the overall gain of the first antenna unit is hardly reduced. Therefore, the second antenna unit 270 has little influence on the wireless signal transmission / reception performance of the first antenna unit 260. [

The conductive pattern 271 does not affect the gain of the first antenna portion 260 and the length and width can be tuned to reduce the electromagnetic wave absorption rate. That is, the designer can design the first antenna unit 260 first, then adjust the length and width of the conductive pattern 271 to reduce the electromagnetic wave absorption rate. Also, the first antenna unit 260 may be standardized and applied to mobile terminals of different kinds, and the adjustment of the specific absorption rate of electromagnetic waves may be separately performed through tuning of the conductive pattern. This facilitates the design and rework of the antenna device.

7, the reflection coefficient (thick solid line) of the second antenna unit 270 is resonated between 1850 Mhz and 1910 Mhz, which is obtained by multiplying the reflection coefficient (dotted line) of the first antenna unit 260 by the PCS transmission frequency Band. The isolation (thin solid line) of the first and second antenna units 260 and 270 sharply decreases in the PCS transmission frequency band and shows a high numerical value in the other bands. As a result, it can be seen that the second antenna unit 270 is coupled to the first antenna unit 260 in the PCS transmission frequency band.

Fig. 8 shows a change in the absorption rate of the electromagnetic wave body when the second antenna portion is absent. It represents 3D with x, y, and z axes, and the intensity of the E field (electric field) absorbed by the head of the human body in the direction of each axis is added as a vector sum to represent the electromagnetic wave absorption rate. Electromagnetic Wave Absorption rate corresponds to the sum of the intensity of the electric force lines absorbed by the head in three axes (x, y, z) and when x, y, z overlap when the electromagnetic wave absorptivity is the highest.

Referring to this figure, it can be seen that the distribution shape of the portion where the absorption rate of the electromagnetic wave body is concentrated by the second antenna portion is changed. This change in distribution pattern leads to reduction of the absorption rate of electromagnetic waves. Experimental results show that the maximum value of the absorption rate of electromagnetic waves is reduced from 2.1 mW / g to 1.93 mW / g. Here, 0Db represents a relative value when it is equal to the reference value.

9A and 9B are a perspective view and a performance graph showing a modified example of the second antenna unit of FIG.

Referring to FIG. 9A, the conductive pattern 371 is formed closer to the first antenna portion 360 than the conductive pattern 271 shown in FIG. 4B. That is, the conductive pattern 371 extends only from the ground arm 373 and the dummy feed arm 374 toward the first antenna unit 360. The distance d2 between the conductive pattern 371 and the first antenna portion 360 may be 1/8 of the wavelength corresponding to the resonant frequency of the conductive pattern 371. [

9B, the reflection coefficient (thick solid line) of the conductive pattern 371 corresponds to the PCS transmission frequency band of the first antenna unit 360, and the reflection coefficient of the conductive pattern 371 (Thin solid line) of the two antenna units 360 and 370 is sharply lowered in the PCS transmission frequency band.

10 is an exploded view showing another example of a mobile terminal according to the present invention, FIG. 11 is an enlarged view of the circuit board and the antenna device of FIG. 10, and FIG. 12 is a view FIG. 13 is a graph showing the performance of the antenna device of FIG. 12; FIG.

Referring to these figures, the second antenna unit 470 includes an auxiliary radiator 475 (hereinafter referred to as a "second radiator") in addition to the conductive pattern 471. More specifically, the second radiator 475 is configured to transmit and receive radio signals of a frequency band different from that of the multi-band of the first antenna unit 460. In this case, the first antenna unit 460 is configured to transmit and receive a multi-band radio signal, while the second antenna unit 470 can be configured to transmit and receive a single-band radio signal. The second radiator 475 is configured to transmit and receive a radio signal related to, for example, Bluetooth or global positioning system (GPS).

Referring to FIGS. 10 and 11, the second radiator 475 may be patterned on one side of the auxiliary circuit board 483. The auxiliary circuit board 483 is formed integrally with the circuit board 481. However, the present invention is not limited thereto and may be formed of a separate flexible circuit board. The circuit board 281 is electrically connected to the first and second antenna units 460 and 470, respectively, to process the multi-band and single-band radio signals. The shield member 482 is at least partially cut so that the second antenna unit 470 is exposed to the outside.

The conductive pattern 471 extends from the second radiator 475 and is formed to have a resonant frequency corresponding to at least one of the transmit frequencies of the first antenna portion 460. [ Through this, the conductive pattern 471 is coupled with the first antenna unit 460 to reduce the electromagnetic wave absorption rate.

The conductive pattern 471 extends from the second radiator 475 toward the first antenna portion 460 such that one end thereof is spaced apart from the first antenna portion 460 by a predetermined distance. According to the drawing, the second radiator 475 and the conductive pattern 471 are electrically connected to the circuit board 281, respectively.

The second radiator 475 is grounded and fed to the circuit board 281 and the conductive pattern 471 is connected between the ground and the power supply connection portions S and F of the second radiator 475, And is grounded to the circuit board 281. The circuit board 281 is formed so as to process the radio signal transmitted and received by the second radiator 475 and not to process the radio signal received by the conductive pattern 471. That is, the second antenna unit 470 is provided with a single-band antenna and a dummy antenna for reducing only the specific absorption rate of electromagnetic waves.

Referring to FIG. 12, when the conductive pattern 471 is not provided, the length of the second radiator 475 becomes longer. When the conductive pattern 471 extends from the second radiating element 475 toward the first antenna portion 460, the second radiating element 475 is formed so as to have the same resonance frequency as in the case where the conductive pattern 471 is absent Can be shortened. The influence of the second radiator 475 on the gain of the first antenna unit is insufficient.

11 and 13, for example, the conductive pattern 471 may have a resonant frequency corresponding to the PCS transmission frequency, and the second radiator 475 may have a resonant frequency corresponding to Bluetooth (See thick solid line). In addition, the degree of isolation between the conductive pattern 471 and the PCS transmission frequency (thin solid line) is reduced, and the electromagnetic wave absorption rate of the antenna device can be reduced.

The mobile terminal described above can be applied not only to the configuration and method of the embodiments described above but also to the embodiments described above so that all or some of the embodiments may be selectively combined have.

Claims (20)

A terminal body;
A first antenna unit mounted on the main body and configured to transmit and receive multi-band radio signals;
A circuit board electrically connected to the first antenna unit to process the radio signal; And
A second antenna unit coupled to the first antenna unit and spaced apart from the first antenna unit by a predetermined distance so as to reduce a Specific Absorption Rate (SAR) And a second antenna portion formed to have a resonant frequency of < RTI ID = 0.0 >
And the second antenna unit includes a dummy antenna unit configured to process a radio signal corresponding to the resonance frequency. delete Claim 3 has been abandoned due to the setting registration fee. The method according to claim 1,
Wherein all connection paths electrically connecting the dummy antenna unit and the circuit board are connected to the ground. delete Claim 5 has been abandoned due to the setting registration fee. The method according to claim 1,
Wherein the first antenna unit includes a first radiator configured to transmit a multi-band radio signal,
Wherein the second antenna portion includes a conductive pattern spaced apart from the first radiator by a predetermined distance. Claim 6 has been abandoned due to the setting registration fee. 6. The method of claim 5,
The second antenna unit includes:
A ground arm extending from the conductive pattern and grounded to the circuit board; And
Wherein the second antenna unit is a planar inverted F antenna (PIFA) antenna but is grounded and connected to the circuit board so as not to process a radio signal. Claim 7 has been abandoned due to the setting registration fee. 6. The method of claim 5,
Wherein the predetermined distance is 1/8 to 1/2 of a wavelength corresponding to the resonance frequency. delete Claim 9 has been abandoned due to the setting registration fee. The method according to claim 1,
Wherein the transmission frequencies of the first antenna unit include a frequency band corresponding to at least one of a personal communication system (PCS), an advanced wireless service (AWS), and a digital communications network (DCN). Claim 10 has been abandoned due to the setting registration fee. The method according to claim 1,
The second antenna unit includes:
A second radiator for transmitting and receiving a radio signal of a frequency band different from that of the multi-band; And
And a conductive pattern extending from the second radiator and having a resonant frequency corresponding to at least one of the transmit frequencies of the first antenna section. Claim 11 has been abandoned due to the set registration fee. 11. The method of claim 10,
The second radiator and the conductive pattern are electrically connected to the circuit board, respectively,
Wherein the circuit board is configured to process a radio signal transmitted and received by the second radiator and not to process a radio signal received in the conductive pattern. Claim 12 is abandoned in setting registration fee. The method according to claim 1,
Wherein the first antenna unit is disposed adjacent to one end of the main body, and the second antenna unit is formed to be perpendicular to the first antenna unit. Claim 13 has been abandoned due to the set registration fee. 13. The method of claim 12,
The main body is formed with a receiving portion in which a battery can be received,
Wherein the first antenna portion and the second antenna portion are disposed adjacent to perpendicular corners of the receiving portion, respectively. A terminal body;
A first antenna unit mounted on the main body and configured to transmit and receive multi-band radio signals;
A second antenna unit disposed to be spaced apart from the first antenna unit and configured to transmit and receive a single band radio signal; And
And a circuit board electrically connected to the first and second antenna units to process the multi-band and single-band radio signals, respectively,
The second antenna unit includes:
An auxiliary radiator for transmitting and receiving the radio signal of the single band; And
And a conductive pattern coupled to the antenna unit and having a resonant frequency corresponding to at least one of the transmission frequencies of the antenna unit so as to reduce a Specific Absorption Rate (SAR). Claim 15 is abandoned in the setting registration fee payment. 15. The method of claim 14,
Wherein the conductive pattern extends from the auxiliary radiator toward the first antenna unit such that one end thereof is spaced apart from the first antenna unit by a predetermined distance. Claim 16 has been abandoned due to the setting registration fee. 15. The method of claim 14,
Wherein the auxiliary radiator is connected to the circuit board by ground and power feed, and the conductive pattern is grounded and connected to the circuit board between the ground and power supply connection portions of the auxiliary radiator. Claim 17 has been abandoned due to the setting registration fee. 15. The method of claim 14,
Wherein the circuit board is formed to process the radio signal received in the conductive pattern. delete Claim 19 is abandoned in setting registration fee. 15. The method of claim 14,
Further comprising a carrier formed to mount the auxiliary radiator and disposed adjacent to one end of the main body. delete

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