KR20140062856A - Mobile terminal - Google Patents

Abstract

A mobile terminal according to an exemplary embodiment of the present invention includes a conductive member embedded in a terminal body to radiate a radio signal and matching elements connected to the conductive member at different points and one of the matching elements And a switch for switching to ground.

Description

[0001] MOBILE TERMINAL [0002]

Embodiments of the present invention relate to a mobile terminal having an antenna device for transmitting and receiving radio signals.

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

As the functions of the mobile terminal are diversified, the mobile terminal is implemented in the form of a multimedia device having complicated functions such as photographing and photographing of a moving picture, reproduction of a music or video file, and reception of a game and a broadcast.

Various new attempts have been made in terms of hardware or software to implement the complex functions of 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 to the above attempts, it may be considered to further improve the functions of the hardware and the like. These improvements include structural changes and improvements for the user to use the mobile terminal more conveniently. It can be considered for an antenna that transmits and receives radio waves in one of the above structural changes and improvements.

An antenna is a device that is formed to transmit and receive wireless electromagnetic waves for wireless communication, and is an essential component required for a mobile terminal. Since the mobile terminal tends to implement various functions such as a WiBro and a DMB in addition to a voice call, the antenna must be designed to be small enough to be embedded in a mobile terminal as well as to implement bandwidths satisfying the functions.

In accordance with the above requirements, antennas capable of implementing multi-frequency bands are being designed. However, there is a problem in that the structure of the antenna is complex, and it is difficult to independently adjust parameter values that determine characteristics such as resonance frequency, bandwidth, gain, and the like. In order to solve these problems, researches on an antenna having a new matching structure have been actively conducted.

It is an object of the present invention to provide a mobile terminal having a more efficient antenna with a smaller size.

It is another object of the present invention to provide a mobile terminal having an antenna capable of transmitting and receiving radio electromagnetic waves of a multi-frequency band.

According to an aspect of the present invention, there is provided a mobile terminal comprising: a conductive member embedded in a terminal body to radiate a radio signal; And a switch for switching either the matching elements or the matching elements to ground.

According to an example of the present invention, the matching elements include a first matching element and a second matching element disposed between the conductive member and the switch, and the first matching element and the second matching element are arranged to operate as main components in impedance matching, May be formed to have a larger capacitance value than the second matching element.

According to an example of the present invention, the first matching element may be formed to have a capacitance value at least twice as large as that of the second matching element.

According to an example of the present invention, the sub-element may further include a sub-element connected in series to the first matching element, and the sub-element may be formed to have a larger capacitance value than the first matching element.

According to an example of the present invention, the sub-element may be formed to have a capacitance value at least 10 times larger than that of the second matching element.

According to an example of the present invention, when the switch is switched, it may be formed to connect the first matching element or the second matching element to the ground.

According to an example of the present invention, the capacitance value of the second matching element may be less than or equal to 0.9 times the capacitance value of the switch.

The mobile terminal according to at least one embodiment of the present invention configured as described above improves the bandwidth in the corresponding frequency band by arranging the matching elements in parallel and performing impedance matching by switching connecting the matching elements using the switch , The gain loss due to the switch can be minimized.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention;
2 is a front perspective view of a mobile terminal according to an embodiment of the present invention;
3 is a rear perspective view of the mobile terminal of FIG. 2;
FIG. 4 is an exploded perspective view of FIG. 3; FIG.
5 is a conceptual diagram showing a switch and a conductive member according to a comparative example;
6 is a conceptual diagram showing a switch and a conductive member according to an embodiment of the present invention;
FIGs. 7A and 7B are diagrams showing an example in which impedance is determined when the switch connects one of the matching elements to ground in FIG. 6, and FIG. 7C shows a voltage standing wave ratio according to a frequency.
FIGS. 8A and 8B are views showing an example in which impedance is determined when the switch connects another matching element to ground in FIG. 6, and FIG. 8C is a diagram showing voltage standing wave ratio according to frequency.

Hereinafter, a mobile terminal according 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. In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

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. However, it will be understood by those skilled in the art that the configuration according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, and the like, unless the configuration is applicable only to a mobile terminal.

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 Broadcast-Handheld (ISDB-T), Integrated Services Digital Broadcast-Terrestrial (ISDB-T), and the like. 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 base portion 265 (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 the visual, auditory or tactile sense and includes a display unit 151, an audio output module 152, an alarm unit 153, and a haptic module 154 .

The display unit 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 unit 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 unit 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 unit 151 of the terminal body.

There may be two or more display units 151 according to the embodiment of the mobile terminal 100. For example, in the mobile terminal 100, a plurality of display portions may be spaced apart from one another or may be disposed integrally with each other, or may be disposed on different surfaces.

(Hereinafter, referred to as a 'touch screen') in which a display unit 151 and a sensor for sensing a touch operation (hereinafter, referred to as 'touch sensor') form 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 unit 151 or a capacitance generated in a specific portion of the display unit 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 unit 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 unit 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 suction force of the air through the injection port or the suction port, a touch on the skin surface, contact of 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 port for connecting a device with a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, an identification module, an audio I / 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 170 may be a path through which power from the cradle is supplied to the mobile terminal 100, or various commands A signal may be a path through which the signal is transmitted to the mobile 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 a processor, controllers, micro-controllers, microprocessors, and other electronic units for performing other functions. In some cases, The embodiments described may be implemented by the control unit 180 itself.

According to a software implementation, embodiments such as the procedures and functions described herein may be implemented with separate software modules. Each of the software modules may perform one or more of the functions and operations described herein. Software code can be implemented in a software application written in a suitable programming language. The software code is stored in the memory 160 and can be executed by the control unit 180. [

FIG. 2 is a perspective view of a mobile terminal according to an embodiment of the present invention, and FIG. 3 is a rear perspective view of the mobile terminal shown in FIG. 2. Referring to FIG.

Referring to FIGS. 2 and 3, the mobile terminal 200 includes a bar-shaped terminal body 204. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, and a swing type in which two or more bodies are coupled to be movable relative to each other. Further, the mobile terminal described herein may be any portable electronic device having a camera and flash, for example, a mobile phone, a smart phone, a notebook computer, a digital broadcast terminal, a Personal Digital Assistants ), A PMO (Portable Multimedia Player), and the like.

The mobile terminal (200) according to the present invention includes a terminal body (204) constituting its appearance.

The casing (casing, housing, cover, etc.) constituting the external appearance of the terminal body 204 is formed by the front case 201, the rear case 202, and the battery case 203. The battery case 203 is formed so as to cover the rear surface of the rear case 202.

Various electronic components are embedded in the space formed 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.

The display unit 210 includes a display unit 210, a first sound output unit 211, a front camera unit 216, a side key 214, an interface unit 215, and a signal input unit 217 .

The display unit 210 includes an LCD (Liquid Crystal Display) module, an OLED (Organic Light Emitting Diodes) module, and an e-paper for visually expressing information. The display unit 210 may include touch sensing means for inputting data by a touch method. Hereinafter, the display unit 210 including the touch sensing unit will be referred to as a 'touch screen'. If any one of the touches on the touch screen 210 is touched, the contents corresponding to the touched position are input. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like. The touch sensing means is formed in a translucent manner so that the display portion can be seen, and a structure for enhancing the visibility of the touch screen in a bright place may be included. Referring to FIG. 2, the touch screen 210 occupies most of the front surface of the front case 201.

The first sound output unit 211 may be implemented as a receiver for delivering a call sound to a user's ear or a loud speaker for outputting various alarm sounds or multimedia playback sounds.

The front camera unit 216 processes an image frame such as a still image or a moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display unit 210. [

The image frame processed by the front camera 216 can be stored in the memory 160 or transmitted to the outside through the wireless communication unit 110. [ The front camera 216 may be provided in two or more depending on the use environment.

The signal input unit 217 is operated to receive a command for controlling the operation of the mobile terminal 200 and may include a plurality of input keys. The input keys may also be referred to as a manipulating portion and may be employed in any manner as long as the user has a tactile sense and operates in a tactile manner.

For example, a dome switch or touch screen capable of receiving a command or information by a push or touch operation of a user, a touch pad, or a wheel, a jog type or a joystick for rotating a key . The contents input by the signal input unit 217 can be variously set. For example, to enter start, end, scroll, and the like.

A side key 214, an interface 215, and an acoustic input unit 213 are disposed on the side surface of the front case 201.

The side key 214 may be collectively referred to as an operation unit, and a command for controlling the operation of the mobile terminal 200 may be input. The side key 214 may be employed in any manner as long as the user is operating in a tactile manner with a tactile impression. The content input by the side key 214 can be variously set. For example, by the side key 214, it is possible to control the image input units 216 and 221, adjust the size of the sound output from the sound output unit 211, or switch the display unit 210 to the touch recognition mode Command can be input.

The sound input unit 213 may be implemented, for example, in the form of a microphone to receive a user's voice, other sounds, and the like.

The interface unit 215 is a channel through which the mobile terminal 200 related to the present invention can exchange data with an external device. For example, the interface unit 215 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 the like, or power supply terminals for supplying power to the mobile terminal 200. The interface unit 215 may be implemented as a socket for receiving an external card such as a SIM (Subscriber Identification Module) or a UIM (User Identity Module) or a memory card for storing information.

A power supply unit 240 and a rear camera unit 221 are disposed on the rear surface of the terminal body 204.

A flash 222 and a mirror (not shown) may be disposed adjacent to the rear camera unit 221. The flash illuminates the subject toward the subject when the subject is photographed by the rear camera unit 221.

The mirror 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 by using the rear camera unit 221. [

The rear camera unit 221 may have a photographing direction substantially opposite to that of the front camera unit 216 disposed on the front side and may be a camera having different pixels from the front camera unit 216. [

For example, the front camera unit 216 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party. The rear camera unit 221 photographs a general subject and immediately transmits It is preferable to have a high pixel. The front and rear camera units 216 and 221 may be installed in the terminal body 204 to be rotatable or pop-upable.

The battery 240 supplies power to the mobile terminal 200. The battery 240 may be embedded in the terminal body 204 or may be detached from the terminal body 204 directly.

4 is an exploded perspective view of FIG.

Referring to FIG. 4, the mobile terminal includes a window 210a and a display module 210b that constitute the display unit 210. Referring to FIG. The window 210a may be coupled to one surface of the front case 201. [ The window 210a and the display module 210b may be integrally formed.

A frame 260 is formed to support electrical elements between the front case 201 and the rear case 202. The frame 260 is formed to support at least one of the display module 210b, the camera module 221, the antenna device, the battery 240, and the circuit board 250 .

The frame 260 may be partially exposed to the outside of the terminal. In addition, the frame 260 may constitute a part of a sliding module that connects the main body and the display unit to each other in a slide type terminal, not a bar type.

4 shows that the circuit board 250 is disposed between the frame 260 and the rear case 202 and the display module 210b is coupled to one side of the frame 260 . The circuit board 250 and the battery may be disposed on the other surface of the frame 260 and the battery case 203 may be coupled to the rear case 202 to cover the battery.

The window 210a is coupled to one surface of the front case 201. A touch sensing pattern 210c may be formed on one side of the window 210a to detect a touch. The touch sensing pattern 210c is formed to sense the touch input and is made of light transmissive. The touch sensing pattern 210c may be mounted on the front surface of the window 210a and may be configured to convert a change in a voltage or the like occurring in a specific portion of the window 210a into an electrical input signal.

The display module 210b is mounted on the rear surface of the window 210a. In this embodiment, a thin film transistor-liquid crystal display (TFT LCD) is disclosed as an example of the display module 210b, but the present invention is not limited thereto.

For example, the display module 210b may be a liquid crystal display (LCD), an organic light-emitting diode (OLED), a flexible display, a three-dimensional display .

As described above, the circuit board 250 may be formed on one side of the frame 260, but may be mounted on the lower side of the display module 210b. At least one electronic device is mounted on the lower surface of the circuit board 250.

In the frame 260, a recessed receptacle is formed to receive the battery 240. A contact terminal connected to the circuit board 250 may be formed on one side of the battery receiving part to supply power to the terminal body.

An antenna device may be formed on the upper or lower end of the mobile terminal. Also, the plurality of antenna devices may be disposed at each end of the terminal, and each antenna device may be configured to transmit and receive radio signals of different frequency bands. Such an antenna device may be formed including a conductive member 310 (see Fig. 6A) formed on one side of the carrier 390 (see Fig. 6A). For example, the carrier 390 in which the conductive member 310 is formed can be seated in the portion A shown in Fig. The carrier 390 can be coupled to the A portion of the case 201 by a fastening means such as a screw. At this time, the screw can be fastened to the hole 262 formed in the case 201 through the through hole formed in the carrier 390. The ribs 263 of the frame 260, which will be described later, can define a space in which the carrier 390 is mounted.

The frame 260 may be formed of a metal material so that sufficient rigidity can be maintained even if the frame 260 is formed to have a small thickness. The metal frame 260 may operate as a ground. That is, the circuit board 250 or the antenna device may be grounded to the frame 260, and the frame 260 may operate as the circuit board 250 or the ground of the antenna device. In this case, the frame 260 may extend the ground of the mobile terminal.

The circuit board 250 is electrically connected to the antenna device and is configured to process a wireless signal (or radio electromagnetic wave) transmitted and received by the antenna device. For processing of the radio signal, a plurality of transmission / reception circuits may be formed or mounted on the circuit board 250.

The transceiver circuits may be formed including one or more integrated circuits and associated electrical components. In one example, the transceiver circuitry may include a transmit integrated circuit, a receive integrated circuit, a switching circuit, an amplifier, and the like.

The plurality of transceiver circuits simultaneously power the conductive members formed of the conductive pattern, which is the conductive member, so that the plurality of antenna devices can operate simultaneously. For example, while either one is transmitting, the other can receive, both transmit or both receive.

The coaxial cable may be formed to connect the circuit board and each antenna device to each other. In one example, the coaxial cable may be connected to a feeder that feeds the antenna devices. The power feeding devices may be formed on one surface of the flexible circuit board 242, which is formed to process signals input from the operation unit 217. [ The other surface of the flexible circuit board 242 may be combined with a signal transmission unit formed to transmit a signal of the operation unit 217. [ In this case, a dome may be formed on the other surface of the flexible circuit board 242, and an actuator may be formed in the signal transmission unit.

The antenna devices ANT1 and ANT2 may be formed on one side and the other side of the carrier 390, respectively. Each of the antenna devices ANT1 and ANT2 is formed to transmit and receive signals of different frequency bands.

For example, the first antenna device ANT 1 may be formed to transmit and receive signals of the DCN 1x scheme or the PCS 1x scheme, and the second antenna device ANT 2 may be formed of a DCN EVDO (Evolution-Data Optimized or Evolution- Data Only) system.

In addition, when the first antenna apparatus ANT 1 transmits / receives a signal conforming to the LTE B4 scheme, the second antenna apparatus ANT 2 can be formed to transmit / receive signals conforming to the LTE B13 scheme.

Alternatively, when the first antenna device ANT 1 transmits / receives a signal corresponding to the voice service of the mobile terminal, the second antenna device ANT 2 may be configured to transmit / receive a data signal corresponding to the LTE service of the mobile terminal have.

A flexible circuit board 242 may be connected to the lower portion of the carrier 390. The flexible circuit board 242 may be connected to a circuit board 250, one end of which is provided with a control unit. And the flexible circuit board 242 may be connected to the operation unit 217 of the terminal. In this case, the flexible circuit board 242 is formed so that the signal generated by the operation unit 217 is transmitted to the control unit of the circuit board 250. The flexible circuit board 242 is formed at a lower portion of the operation portion 217 to be connected to the operation portion 217 and is in contact with the signal transmission portion 217a formed between the operation portion 217 and the flexible circuit board 242 .

One surface of the flexible circuit board 242 is formed to be in contact with the operation unit 217 and the first antenna unit ANT1 and the power supply connection F of the second antenna unit ANT2 are formed on the other surface of the flexible circuit board 242, The contact portion 242a may be formed so as to be connected to the ground connection portion G, respectively.

FIG. 5 is a conceptual diagram showing a switch and a conductive member according to a comparative example, and FIG. 6 is a conceptual diagram showing a switch and a conductive member according to an embodiment of the present invention.

The switch and the conductive member according to the comparative example and the embodiment may constitute a part of the first antenna device ANT1 or the second antenna device ANT2 described above.

Referring to FIG. 5, the conductive member 31 may be formed on one side of the carrier 290. For example, in the case of an inverted F-type (PIFA) antenna, the conductive members 31 may be connected to feed and ground at different points. The feed connection FC for feeding the conductive member 31 and the ground connection SC for grounding the conductive member 31 may be formed on the substrates 242 and 250, respectively. The power supply connection part FC constitutes a part of the power supply device 35, and the power supply device can be connected to the transmission / reception circuit.

When the antenna resonates in the multi-frequency band, the matching elements 32a and 32b matching the impedance of the antenna are used to increase the gain or bandwidth of the antenna in each frequency band. Each matching element is configured to match the impedance at a frequency in a particular frequency band. Therefore, the matching elements 32a and 32b and the conductive member 31, which improve the frequency characteristics of the different frequency bands, are connected by the switch 33 and the matching element 31 and the conductive member 31 are connected by the switching connection So that the impedance matching can be performed in the corresponding frequency band.

For example, the first matching element 32a is formed to perform impedance matching in order to improve the antenna efficiency in a frequency band of about 750 MHz, and the second matching element 32b is formed to have an antenna efficiency To improve the impedance matching. The switch 33 switches and connects the conductive member 31 and the matching elements 32a and 32b, respectively.

However, the switch 33 has a resistance component as a passive element. That is, due to the resistance component of the switch 33 itself, a gain loss of at least 3 dB to 5 dB occurs in the antenna. Particularly, in a low power structure such as a mobile terminal, a gain loss due to the switch 33 may become a main factor deteriorating the efficiency of the antenna.

The present invention is intended to prevent the efficiency of the antenna from being degraded due to the switch 330 as described above. Hereinafter, a description will be made with reference to FIG.

Referring to FIG. 6, the conductive member 310 may be formed on one side of the carrier 290. Or alternatively may be formed on the one surface of the circuit board 250 or the flexible circuit board 242 in a conductive pattern.

The conductive member 310 operates as a radiator in an antenna such as a PIFA type antenna, a folded dipole type, or a monopole type. Since the conductive member 310 must be connected to the power supply or the ground, any part of the conductive member 310 is branched and extends to the substrate (circuit board or flexible circuit board). Connections for feeding or grounding the conductive member 310 may be formed directly on the conductive member 310 or may be formed on the substrate 242, 252.

For example, as shown in FIG. 6, when the conductive member 310 is formed of a PIFA type antenna, a part that feeds the conductive member 310 or a part that grounds the conductive member 310 from the conductive member 310 to the substrate 242, 252, As shown in FIG. Alternatively, holes may be formed to penetrate the top and bottom surfaces of the carrier 290, and a portion of the conductive member 310 may extend to the substrate 242, 252 facing the bottom surface through the holes.

Referring to FIG. 6, a ground connection portion of the conductive member 310 is disposed facing the substrate 242, 252, and may extend to the carrier 290 by a predetermined length. The conductive members 310 may be connected to the ground of the substrates 242 and 252 at different points of the elongated conductive member 310, respectively. The circuit board 250 or the flexible circuit board 242 may be the ground of the antenna device. The ground connection may ground and electrically connect the conductive members 310 and 310 to an impedance match to the resonant frequency of the antenna. The ground connection SC is an electrical path connecting the ground and the conductive member 310, and may include at least one of a ground plate, a grounding clip, or a grounding line.

At least two ground connection portions may be formed, and each of the ground connection portions SC1 and SC2 may be a start portion of a connection line having a different length. The first connection line LINE 1 is connected to the first matching element 321 through the first matching element 321 at the first point of the conductive member 310, And the second connection line LINE 2 may be a line extending from the second point of the conductive member 310 through the second matching element 322 to the switch 330. [

At this time, the switch 330 is formed to connect the first connection line LINE 1 and the second connection line LINE 2 to each other. The switch 330 may be a single pole double throw (SPDT) switch 330 and a single pole multithrow (SPMT) switch 330 may be used if the connection line is a plurality of three or more. have. That is, when the antenna resonates in the multi-frequency band, matching elements corresponding to respective frequency bands may be formed, and one end of the matching elements is connected to the conductive member 310 and the other end is connected to the switch 330. When the switch 330 is switched to connect one of the matching elements to the conductive member 310, the matching element matches the impedance to exhibit improved antenna performance in a specific frequency band.

The switch 330 is connected to the ground so that one of the matching elements can be connected to the ground during the switching connection.

The conductive member 310 may be formed to be in contact with the feed connection FC of the substrate 242 or 252 at a position spaced from the ground connection point. The power supply connection part FC feeds the power feeding part and the conductive members 310 and 310 in an electrically connected or EM (Electro-Magnetic) feeding manner. For this connection, the feed connection FC may be formed to include at least one of a feed plate, a power supply clip, and a feeder line. Here, the power supply plate, the power supply clip, or the power supply line are electrically connected to each other, and the conductive member 310 (310) for transmitting and receiving the radio frequency current (or voltage) ). Here, the feed line may include a microstrip printed on the substrate 242, 252.

The power supply connection part FC constitutes a part of the power supply device 350. The feeding device 350 refers to a portion that feeds the conductive member 310 to transmit a signal through the conductive member 310 and may be configured in combination of a balun, a phase shifter, a divider, an attenuator, an amplifier, The feeding device 350 may be connected to one or more transmitting / receiving circuits. The transmit / receive circuit is configured to process the radio signals transmitted and received through the conductive member 310 as described above.

The matching elements 321, 322, and 340 may be formed to include any one of a series element and a shunt element. When composed of series elements, the reactance, which is the imaginary part of the impedance, can be changed. For example, inductors increase reactance and capacitors lower reactance, so the impedance of a particular frequency band can change. Alternatively, in the case of a shunt device, the resistance, which is the real number of the impedance, can be changed. For example, the impedance of a particular frequency band can be changed by increasing the resistance value of the inductor and lowering the resistance value of the capacitor.

When the matching elements are formed so as to include the first matching element 321 and the second matching element 322, the first matching element 321 is formed on the first connecting line LINE 1, (322) may be formed on the second connection line (LINE 2). In this case, the matching element may be formed of conductive patterns, or may be realized as a lumped element such as an inductor or a capacitor.

Any one of the matching elements operates as a main component in impedance matching. For example, if the first matching element 321 is formed to have a larger capacitance value than the second matching element 322, the first matching element 321 operates as a main component in impedance matching. That is, when the second matching element 322 has a capacitance value of 3 pF, if the capacitance of the first matching element 321 becomes 8.2 pF which is more than twice as large as the capacitance of the first matching element 321, The capacitance component becomes the main component. That is, the capacitance of the first matching element 321 becomes a main component in the impedance matching because the capacitors connected in parallel determine the total capacitance value as will be described later.

C = C ₁ + C ₂

11.2 pF = 8.2 + 3

That is, in the case of a capacitor connected in parallel, if any one of the capacitors has a value twice or more as large as that of the other capacitors, the total capacitance becomes 66% or more of the total capacitance value.

The gain of the antenna can be reduced by the resistance loss of various elements constituting the antenna. Particularly passive elements such as the SPDT switch 330 have a capacitance value of about 3.5 pF, which reduces the antenna gain by about 3 dB.

However, if the sub-element 340 is used in parallel with the switch 330 and the switch 330 is connected to the ground at this time, the loss due to the switch 330 can be reduced.

That is, when the capacitance inside the switch 330 is 3.4 pF and the capacitance of the sub element 340 is 100 pF, which is 10 times larger than the capacitance of the sub element 340, the capacitance component of the sub element 340 becomes the main component in impedance matching . That is, since the capacitance values of the capacitors connected in parallel are determined as shown in the following equation, the capacitance component of the sub element 340 becomes a main component in the impedance matching, and the gain loss due to the switch 330 can be reduced.

C = C ₁ + C ₂

103.4 pF = 100 + 3.4

That is, if the capacitor connected in parallel to the switch 330 is formed to be larger than the internal capacitance value of the switch 330 by 10 times or more, the influence of the switch 330 at the total capacitance value becomes less than 10% ) Can be ignored.

Hereinafter, examples in which matching elements are arranged in parallel, and matching elements are switched and connected using a switch 330 to perform impedance matching will be described with reference to the drawings.

FIGS. 7A and 7B are diagrams showing an example in which the impedance is determined when the switch connects one of the matching elements to the ground in FIG. 6, and FIG. 7C is a diagram showing a voltage standing wave ratio according to the frequency.

As shown in FIG. 7A, the first matching element 321 and the sub element 340 may be disposed on the first connection line, and the second matching element 322 may be disposed on the second connection line. The switch 330 is formed so as to switch and connect the ground and the first connection line or the second connection line.

The switch 330 may be connected to a connection line between the first matching element 321 and the sub-element 340 of the first connection line in order to perform impedance matching in the first frequency band with a center frequency of 750 MHz.

For example, the first matching element 321 may be formed to have a capacitance of 8.2 pF, the second matching element 322 may be formed to have a capacitance of 3 pF, and the sub-element 340 may have a capacitance of 100 pF, , And the general SPDH switch 330 has an internal capacitance of 3.4 pF.

When the switch 330 is connected to the first connection line, the impedance can be calculated by the capacitance value of the first matching element 321 and the sub element 340 and the switch 330, ignoring the second matching element 322 have.

As shown in FIG. 7B, the capacitors connected in parallel can sum their values. The resulting capacitance is 103.4 pF. Then, the capacitors connected in series can obtain the capacitance as shown in the following equation.

1 / C = 1 / C ₁ + 1 / C ₂

1 / (1 / 103.4 + 1 / 8.2) = 7.6 pF

Thus, the total capacitance value is 7.6 pF.

When impedance matching is performed after switching one of the plurality of matching elements using the switch 330 connected to the ground, as shown in FIG. 7C, the voltage standing wave ratio at the center frequency (750 MHz) of the first frequency band With 1: 3 or less, it can be seen that the antenna performance is improved with respect to antenna efficiency and bandwidth.

That is, by matching the impedance using the switch 330, the bandwidth can be improved in the first frequency band, and the loss caused by the switch 330 can be minimized.

FIGS. 8A and 8B are diagrams showing an example in which the impedance is determined when the switch connects another matching element to the ground in FIG. 6, and FIG. 8C is a diagram showing a voltage standing wave ratio according to the frequency.

As shown in FIG. 8A, in order to perform the impedance matching in the second frequency band with the center frequency of 850 MHz, the switch 330 connects the second matching element 322 of the second connection line LINE 2 and the ground .

For example, the first matching element 321 may be formed to have a capacitance of 8.2 pF, the second matching element 322 may be formed to have a capacitance of 3 pF, and the sub-element 340 may have a capacitance of 100 pF, , And the general SPDH switch 330 has an internal capacitance of 3.4 pF. In this case, the capacitance value of the second matching element 322 is formed to be 0.9 times or less than the internal capacitance value of the switch 330, so that the second matching element 322 can determine the capacitance value with respect to the switch 330 Make it a superior ingredient.

When the switch 330 connects the second matching element 322 and the ground to each other, the capacitance value of the first matching element 321, the second matching element 322, the sub element 340, Can be calculated.

As shown in FIG. 8B, a capacitor connected in series can obtain a capacitance according to the following equation.

1 / C = 1 / C ₁ + 1 / C ₂

At this time, the capacitance value of the first connection line is as follows.

1 / (1/100 + 1 / 8.2) = 7.6 pF

The capacitance value of the second connection line is as follows.

1 / (1/3 + 1 / 3.4) = 1.6 pF

The capacitors connected in parallel can sum their values.

7.6 + 1.6 = 9.2 pF

Thus, the total capacitance value is 9.2 pF.

When impedance matching is performed after switching one of the plurality of matching elements by using the switch 330 connected to the ground, as shown in FIG. 8C, the voltage standing wave ratio at the center frequency (850 MHz) of the second frequency band With 1: 3 or less, it can be seen that the antenna performance is improved with respect to antenna efficiency and bandwidth.

That is, by matching the impedances by using the switch 330, it is possible to improve the bandwidth in the second frequency band and minimize the gain loss by the switch 330.

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

Claims (7)

A conductive member embedded in the terminal body and configured to radiate a wireless signal;
Matching elements connected to the conductive member at different points; And
And a switch for switching any one of the matching elements to connect to the ground. The method according to claim 1,
Wherein the matching elements comprise a first matching element and a second matching element disposed between the conductive member and the switch,
Wherein the first matching element has a larger capacitance value than the second matching element to operate as a main component in impedance matching. 3. The method of claim 2,
Wherein the first matching element has a capacitance value that is at least two times larger than that of the second matching element. 3. The method of claim 2,
And a sub-element connected in series to the first matching element,
Wherein the sub-element has a larger capacitance than the first matching element. 5. The method of claim 4,
Wherein the sub-element has a capacitance value that is at least 10 times greater than that of the second matching element. 5. The method of claim 4,
Wherein the switch connects the first matching element or the second matching element to the ground when the switch is switched. 3. The method of claim 2,
Wherein a capacitance value of the second matching element is 0.9 times or less of a capacitance value of the switch.

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