KR20160084745A - Antenna apparatus and mobile terminal having the same - Google Patents

Abstract

The present invention relates to an antenna device and a mobile terminal including the same. The antenna device includes a first conductive member having one end connected to a power feeding part, one end grounded through a first switch or an inductor, A second conductive member connected to one point of the first conductive member, a third conductive member selectively grounded at one end by a second switch and the other end connected to a point of the first conductive member, And at least a portion of the other end is spaced apart from the third conductive member by a predetermined distance, characterized in that the frequency switching is performed by selective ground connection of the third conductive member A mobile terminal including an antenna device is disclosed.

Description

TECHNICAL FIELD [0001] The present invention relates to an antenna device and a mobile terminal including the antenna device.

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

A terminal can be divided into a mobile terminal (mobile / portable terminal) and a stationary terminal according to whether the terminal can be moved. The mobile terminal can be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry the mobile terminal.

The functions of mobile terminals are diversified. For example, there are data and voice communication, photographing and video shooting through a camera, voice recording, music file playback through a speaker system, and outputting an image or video on a display unit. Some terminals are equipped with an electronic game play function or a multimedia player function. In particular, modern mobile terminals can receive multicast signals that provide visual content such as broadcast and video or television programs.

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. .

In order to support and enhance the functionality of such terminals, it may be considered to improve the structural and / or software parts of the terminal.

In addition to the above attempts, in recent years, a wireless communication system using LTE technology has been commercialized to provide various services. In order to provide various services according to the demand of the user, the developed mobile communication service needs to design the antenna satisfying the characteristics at each frequency because the frequency band of the mobile communication used is different for each country and communication company.

Therefore, when a broadband antenna satisfying a multi-band with a single structure is designed, the versatility of a device manufacturer can be improved. Accordingly, the terminal antenna must provide multi-band services including not only LTE but also second- and third-generation mobile communication bands, and research and development thereof are required. However, it is very difficult to design an antenna that satisfies all low-band bands in a limited space of a mobile terminal because of low efficiency and narrow bandwidth.

In order to overcome these problems, researches on tunable antennas have been conducted. The tunable antenna is a single emitter that operates in several frequency bands, so it can reduce the size of the antenna and the frequency control function can achieve a wide effective bandwidth as well as gain similar radiation characteristics and antenna gain in all frequency bands. However, the general Tunable Antenna that is currently being researched and developed has a disadvantage in that it uses only two frequency bands using a switch, or uses a frequency sweep function using a variable-cap, and the tunable range as a whole is narrow. Such a tunable antenna has a limitation in satisfying a sufficient resonance length of the antenna in a limited space, and operates only with an On / Off function in a low band, which limits a frequency shift.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a mobile terminal having an antenna device with improved performance.

Another object of the present invention is to provide an antenna device capable of realizing a wider frequency band.

According to an aspect of the present invention, there is provided a semiconductor device including: a first conductive member connected at one end to a power supply unit; one end connected to the ground through a first switch or an inductor; A second conductive member connected to one point of the member, a third conductive member selectively grounded at one end by a second switch and the other end connected to a point of the first conductive member, And a fourth conductive member grounded to ground and at least a portion of the other end being spaced apart from the third conductive member at a constant distance, wherein switching of the frequency is achieved by selective ground connection of the third conductive member An antenna device can be provided.

According to an aspect of the present invention, the other end of the fourth conductive member may be capacitive coupled to the third conductive member.

According to an aspect of the present invention, the other end of the fourth conductive member may be connected by a variable capacitor.

According to an aspect of the present invention, when the first switch is operated, the frequency can be compensated by the indenter.

According to another aspect of the present invention, there is provided an antenna device including a terminal body and an antenna device provided in the terminal body, wherein the antenna device has a first conductive member connected at one end to a power feeding part, And the other end is connected to one point of the first conductive member, and one end is selectively grounded by a second switch, and the other end is grounded through the other end of the first conductive member And a fourth conductive member having one end grounded at ground and at least a portion of the other end spaced apart from the third conductive member, the third conductive member being connected to the third conductive member, The switching of the frequency is performed by the selective ground connection of the mobile terminal.

Effects of the mobile terminal and the control method according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, it is possible to provide an antenna device and a mobile terminal that can cover all low bands including LTE and have a hand effect compensation function.

Further, according to at least one of the embodiments of the present invention, it is possible to improve the characteristic deterioration of the antenna by automatically recognizing degradation due to user's physical contact.

Further, according to at least one of the embodiments of the present invention, impedance tuning is possible while enabling frequency switching.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1A is a block diagram illustrating a mobile terminal according to the present invention.
1B and 1C are conceptual diagrams illustrating an example of a mobile terminal according to the present invention in different directions.
2 is an exploded perspective view of a mobile terminal according to an embodiment of the present invention.
3 is a conceptual diagram of an antenna device according to an embodiment of the present invention.
4 is a perspective view of an antenna device according to an embodiment of the present invention.
5 is a graph of reflection coefficients according to frequency associated with an embodiment of the present invention.
FIG. 6 is a frequency dependent graph of an antenna apparatus according to an embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. 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 following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.

However, it will be appreciated by those skilled in the art that the configuration according to the embodiments described herein may be applied to fixed terminals such as a digital TV, a desktop computer, a digital signage, and the like, will be.

1A to 1C are block diagrams for explaining a mobile terminal according to the present invention, and FIGS. 1B and 1C are conceptual diagrams showing an example of a mobile terminal according to the present invention in different directions.

The mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a control unit 180, and a power supply unit 190 ), And the like. The components shown in FIG. 1A are not essential for implementing a mobile terminal, so that the mobile terminal described herein may have more or fewer components than the components listed above.

The wireless communication unit 110 may be connected between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and the external server 100. [ Lt; RTI ID = 0.0 > wireless < / RTI > In addition, the wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 for inputting an audio signal, an audio input unit, a user input unit 123 for receiving information from a user A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone 226, a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, A thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen may function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user and may provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a path to various types of external devices connected to the mobile terminal 100. The interface unit 160 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of a port, an audio I / O port, a video I / O port, and an earphone port. In the mobile terminal 100, corresponding to the connection of the external device to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications running on the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least a part of these application programs may exist on the mobile terminal 100 from the time of shipment for the basic functions (e.g., telephone call receiving function, message receiving function, and calling function) of the mobile terminal 100. Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and may be operated by the control unit 180 to perform the operation (or function) of the mobile terminal.

In addition to the operations related to the application program, the control unit 180 typically controls the overall operation of the mobile terminal 100. The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 1A in order to drive an application program stored in the memory 170. FIG. In addition, the controller 180 may operate at least two of the components included in the mobile terminal 100 in combination with each other for driving the application program.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the mobile terminal 100. The power supply unit 190 includes a battery, which may be an internal battery or a replaceable battery.

At least some of the respective components may operate in cooperation with one another to implement a method of operation, control, or control of the mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170. [

Referring to FIGS. 1B and 1C, the disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto and can be applied to various structures such as a folder type, a flip type, a slide type, a swing type, and a swivel type in which a watch type, a clip type, a glass type or two or more bodies are relatively movably coupled . A description of a particular type of mobile terminal, although relevant to a particular type of mobile terminal, is generally applicable to other types of mobile terminals.

Here, the terminal body can be understood as a concept of referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, and the like) that forms an appearance. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

A display unit 151 is disposed on a front surface of the terminal body to output information. The window 151a of the display unit 151 may be mounted on the front case 101 to form a front surface of the terminal body together with the front case 101. [

In some cases, electronic components may also be mounted on the rear case 102. Electronic parts that can be mounted on the rear case 102 include detachable batteries, an identification module, a memory card, and the like. In this case, a rear cover 103 for covering the mounted electronic components can be detachably coupled to the rear case 102. Therefore, when the rear cover 103 is separated from the rear case 102, the electronic parts mounted on the rear case 102 are exposed to the outside.

As shown, when the rear cover 103 is coupled to the rear case 102, a side portion of the rear case 102 can be exposed. In some cases, the rear case 102 may be completely covered by the rear cover 103 during the engagement. Meanwhile, the rear cover 103 may be provided with an opening for exposing the camera 121b and the sound output unit 152b to the outside.

These cases 101, 102, and 103 may be formed by injection molding of synthetic resin or may be formed of metal such as stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

The mobile terminal 100 may be configured such that one case provides the internal space, unlike the above example in which a plurality of cases provide an internal space for accommodating various electronic components. In this case, a unibody mobile terminal 100 in which synthetic resin or metal is connected from the side to the rear side can be realized.

Meanwhile, the mobile terminal 100 may include a waterproof unit (not shown) for preventing water from penetrating into the terminal body. For example, the waterproof portion is provided between the window 151a and the front case 101, between the front case 101 and the rear case 102, or between the rear case 102 and the rear cover 103, And a waterproof member for sealing the inside space of the oven.

The mobile terminal 100 is provided with a display unit 151, first and second sound output units 152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, Cameras 121a and 121b, first and second operation units 123a and 123b, a microphone 122, an interface unit 160, and the like.

1B and 1C, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, an optical output unit (not shown) A second operation unit 123b, a microphone 122 and an interface unit 160 are disposed on a side surface of the terminal body, And a mobile terminal 100 having a second sound output unit 152b and a second camera 121b disposed on a rear surface thereof.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as needed, or placed on different planes. For example, the first operation unit 123a may not be provided on the front surface of the terminal body, and the second sound output unit 152b may be provided on the side surface of the terminal body rather than the rear surface of the terminal body.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information .

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, a 3D display, and an e-ink display.

In addition, the display unit 151 may exist in two or more depending on the embodiment of the mobile terminal 100. In this case, the mobile terminal 100 may be provided with a plurality of display portions spaced apart from each other or disposed integrally with one another, or may be disposed on different surfaces, respectively.

The display unit 151 may include a touch sensor that senses a touch with respect to the display unit 151 so that a control command can be received by a touch method. When a touch is made to the display unit 151, the touch sensor senses the touch, and the control unit 180 generates a control command corresponding to the touch based on the touch. 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 sensor may be a film having a touch pattern and disposed between the window 151a and a display (not shown) on the rear surface of the window 151a, or may be a metal wire . Alternatively, the touch sensor may be formed integrally with the display. For example, the touch sensor may be disposed on a substrate of the display or inside the display.

In this way, the display unit 151 can form a touch screen together with the touch sensor. In this case, the touch screen can function as a user input unit 123 (see FIG. 1A). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver for transmitting a call sound to a user's ear and the second sound output unit 152b may be implemented as a loud speaker for outputting various alarm sounds or multimedia playback sounds. ). ≪ / RTI >

The window 151a of the display unit 151 may be provided with an acoustic hole for emitting the sound generated from the first acoustic output unit 152a. However, the present invention is not limited to this, and the sound may be configured to be emitted along an assembly gap (for example, a gap between the window 151a and the front case 101) between the structures. In this case, the appearance of the mobile terminal 100 can be made more simple because the hole formed independently for the apparent acoustic output is hidden or hidden.

The optical output unit 154 is configured to output light for notifying the occurrence of an event. Examples of the event include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, and reception of information through an application. The control unit 180 may control the light output unit 154 to terminate the light output when the event confirmation of the user is detected.

The first camera 121a processes an image frame of a still image or a moving image obtained by the image sensor in the photographing mode or the video communication mode. The processed image frame can be displayed on the display unit 151 and can be stored in the memory 170. [

The first and second operation units 123a and 123b may be collectively referred to as a manipulating portion as an example of a user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100 have. The first and second operation units 123a and 123b can be employed in any manner as long as the user is in a tactile manner such as touch, push, scroll, or the like. In addition, the first and second operation units 123a and 123b may be employed in a manner that the user operates the apparatus without touching the user through a proximity touch, a hovering touch, or the like.

In this figure, the first operation unit 123a is a touch key, but the present invention is not limited thereto. For example, the first operation unit 123a may be a mechanical key or a combination of a touch key and a touch key.

The contents input by the first and second operation units 123a and 123b can be variously set. For example, the first operation unit 123a receives a command such as a menu, a home key, a cancellation, a search, and the like, and the second operation unit 123b receives a command from the first or second sound output unit 152a or 152b The size of the sound, and the change of the display unit 151 to the touch recognition mode.

On the other hand, a rear input unit (not shown) may be provided on the rear surface of the terminal body as another example of the user input unit 123. The rear input unit is operated to receive a command for controlling the operation of the mobile terminal 100, and input contents may be variously set. For example, commands such as power on / off, start, end, scrolling, and the like, the size adjustment of the sound output from the first and second sound output units 152a and 152b, And the like can be inputted. The rear input unit may be implemented as a touch input, a push input, or a combination thereof.

The rear input unit may be disposed so as to overlap with the front display unit 151 in the thickness direction of the terminal body. For example, the rear input unit may be disposed at the rear upper end of the terminal body such that when the user holds the terminal body with one hand, the rear input unit can be easily manipulated using the index finger. However, the present invention is not limited thereto, and the position of the rear input unit may be changed.

When a rear input unit is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit can be realized. When the first operation unit 123a is not disposed on the front surface of the terminal body in place of at least a part of the functions of the first operation unit 123a provided on the front surface of the terminal body, The display unit 151 may be configured as a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing the fingerprint of the user, and the controller 180 may use the fingerprint information sensed through the fingerprint recognition sensor as authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive the user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations to receive stereophonic sound.

The interface unit 160 is a path through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 may include a connection terminal for connection with another device (for example, an earphone or an external speaker), a port for short-range communication (for example, an infrared port (IrDA Port), a Bluetooth port A wireless LAN port, or the like), or a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 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.

And a second camera 121b may be disposed on a rear surface of the terminal body. In this case, the second camera 121b has a photographing direction which is substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix form. Such a camera can be named an array camera. When the second camera 121b is configured as an array camera, images can be taken in various ways using a plurality of lenses, and a better quality image can be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 shines light toward the subject when the subject is photographed by the second camera 121b.

And a second sound output unit 152b may be additionally disposed in the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a and may be used for implementing a speakerphone mode in a call.

The terminal body may be provided with at least one antenna for wireless communication. The antenna may be embedded in the terminal body or formed in the case. For example, an antenna constituting a part of the broadcast receiving module 111 (see FIG. 1A) may be configured to be able to be drawn out from the terminal body. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

The terminal body is provided with a power supply unit 190 (see FIG. 1A) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 built in the terminal body or detachable from the outside of the terminal body.

The battery 191 may be configured to receive power through a power cable connected to the interface unit 160. In addition, the battery 191 may be configured to be wirelessly chargeable through a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

The rear cover 103 is configured to be coupled to the rear case 102 so as to cover the battery 191 to restrict the release of the battery 191 and to protect the battery 191 from external impact and foreign matter . When the battery 191 is detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

The mobile terminal 100 may be provided with an accessory that protects the appearance or supports or expands the function of the mobile terminal 100. [ One example of such an accessory is a cover or pouch that covers or accommodates at least one side of the mobile terminal 100. [ The cover or pouch may be configured to interlock with the display unit 151 to expand the function of the mobile terminal 100. Another example of an accessory is a touch pen for supplementing or extending a touch input to the touch screen.

Hereinafter, embodiments related to an antenna device and an antenna device constructed as above will be described with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

2 is an exploded perspective view of a mobile terminal according to an embodiment of the present invention. Referring to FIG. 2, the mobile terminal includes a window 210a and a display module 210b constituting the display unit 210 . 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.

2 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.

The antenna device 130 may be formed on the upper or lower end of the mobile terminal. In addition, the plurality of antenna devices 130 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. The antenna device 130 may include conductive members 131, 132, 133, and 134 formed on one side of the carrier 135. For example, the carrier 135, on which the conductive member is formed, may be coupled to 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 135. The ribs 263 of the frame 260, which will be described later, can define the space in which the carrier 135 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.

A plurality of transceiver circuits are simultaneously powered by conductive members formed of a conductive pattern that is a radiator, so that a 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 supply devices may be formed on one surface of the flexible circuit board 242 formed to process signals input from the operation unit 123a. 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 123a. 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.

A flexible circuit board 242 is connected to the lower portion of the carrier 135. 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 can be connected to the operation unit 123a of the terminal. In this case, the flexible circuit board 242 is formed so that the signal generated by the operation unit 123a is transmitted to the control unit of the circuit board 250. [

Conventionally, it is difficult to secure a tuning range of 200 MHz in a low band because a physical space given as an antenna space in a general mobile terminal can be used at about 800 MHz (B5, B8) The bandwidth of 700 to 960 MHz can not be satisfied. In order to overcome such a problem, an embodiment of the present invention has proposed a capacitive-coupled tunable antenna.

The antenna has both a frequency band and impedance matching compensation function, covers 700 ~ 960MHz (B17, B13, B5, B8) and has a wide tuning range over 260MHz. In addition, a variable capacitor 165 is attached to the switch 164 and the coupling pattern 134 in the space of the narrow mobile terminal to overcome this problem.

The antenna device 130 according to an exemplary embodiment of the present invention is capable of both frequency movement characteristics and impedance matching and can realize the antenna of the mobile terminal manufactured for each country with a single antenna, Can be automatically recognized by the mobile terminal by the operation of the closed loop function, so that deterioration of characteristics of the mobile terminal can be overcome and improved.

FIG. 3 is a conceptual diagram of an antenna device 130 according to an embodiment of the present invention, and FIG. 4 is a perspective view of an antenna device 130 according to an embodiment of the present invention. Hereinafter, referring to FIGS. 3 and 4 An antenna device 130 according to an embodiment of the present invention will be described.

The antenna device 130 according to an embodiment of the present invention includes a first conductive member 131 having one end connected to the feed part 161 and one end connected to the first switch 162 or the in- And the other end is connected to the first conductive member 131 and connected to the second conductive member 132 branched from one point of the first conductive member 131, , One end of which is selectively grounded by a second switch (164) and the other end of which is connected to a point on the first conductive member (131) and which branches off from the first conductive member (131) And a fourth conductive member 134 having one end connected to ground G4 and at least a portion of the other end being spaced apart from and parallel to the third conductive member 133, .

The first conductive member 131 may be connected to the power feeder by a feeder 161 and the second conductive member 132 may be grounded to the ground by a ground.

The feeder 161 may electrically connect the first conductive member 131 directly, or may supply the conductive member with an EM (Electro-Magnetic) feeding method. For this connection, the power feeder 161 may include at least one of a feed plate, a power supply clip, and a feeder line. Here, any one of the feed plate, the power supply clip, and the feeder line is electrically connected to the other one to transmit a current (or voltage) supplied through the feeder unit to the conductive members that transmit and receive the wireless signal. Here, the feed line may include a microstrip printed on a substrate.

In addition, the grounds G1, G2, G3, and G4 in the embodiment of the present invention can ground and connect the conductive members 132, 133, and 134 to electrically short-circuit the impedance to match the resonance frequency of the antenna. That is, the grounds G1, G2, G3, and G4 have paths having at least two different lengths, and may be formed with switches corresponding to the respective paths. Also, through a switch that selects each pass, each pass selectively connects the electrical ground and radiators (e.g., conductive members) to different lengths. Here, the path is an electrical path connecting the ground and the radiator, and may include at least one of a ground plate, a grounding clip, or a grounding line. Further, the lengths of the paths can be formed differently by forming the ground wires to have different lengths.

The feed device may include a feeding portion and a matching portion. The feed unit may be configured by a combination of a balun, a phase shifter, a divider, an attenuator, and an amplifier. The matching portion may be realized by a series element or shunt elements. 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 element, 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.

The antenna device 130 is a type of PIFA antenna (Planar Inverted F-type Antenna), and the length of the antenna is formed to have a resonance frequency corresponding to? / 4.

3, the first switch 162 and the inductor 163 are connected in parallel to the second conductive member 132. The first switch 162 and the inductor 163 are connected to the first ground 162 and the inductor 163, respectively, (G1) and the second ground (G2). As such, in one embodiment of the present invention, the second conductive member 132 is grounded, allowing the current to flow selectively through the first switch 162. For example, when the first switch 162 is turned on, most of the current supplied to the first conductive member 131 from the feeder 161 will flow to the first ground G1, A part of the current flowing along the first conductive member 131 flows to the second ground G2 and the remaining current moves along the first conductive member 131 to turn off the third conductive member 131. [ And flows along the member 133.

The current flowing along the third conductive member 133 also flows to the third ground G3 selectively by the second switch 164.

At this time, a current is induced in the fourth conductive member 134, which is formed in parallel with at least a part of the third conductive member 133, so that current also flows in the fourth conductive member 134. At this time, the supply of the current to the fourth conductive member 134 is performed by a capacitive coupling feed (CCF). Thus, the power consumption of the capacitive coupling is reduced.

As such, when fed by capacitive coupling, the value of the capacitive reactance of the antenna can be increased due to the feeding of the capacitive coupling. Increasing the value of the capacitive reactance reduces the resonant frequency because the input impedance due to the capacitance is inversely proportional to the frequency. The fact that the resonant frequency is reduced means that the antenna device 130 includes a capacitive coupling so that it can operate in a lower frequency band with a shorter length. That is, when the antenna device 130 includes the capacitively coupled members, the antenna device 130 can operate in a lower frequency band in a narrower space.

The other end of the fourth conductive member 134 is connected by a variable capacitor 165, and the frequency band can be widened by the variable capacitor 165. At this time, the variable capacitor 165 is grounded to the fourth ground G4.

That is, in one embodiment of the present invention, it can operate in the range of 700 to 960 MHz. In other words, it has a wide tunable range of 260 MHz or more. To this end, the third conductive member 133 is selectively grounded to allow frequency switching. For example, FIG. 5 is a graph of reflection coefficient of the antenna device 130 according to an embodiment of the present invention. As shown in FIG. 5, when the second switch 164 is switched, And the frequency band can be ensured by the adjustment of the variable capacitor 165.

The frequency switching in one embodiment of the present invention means that a frequency variation occurs at a level exceeding a certain bandwidth. For example, it means that a frequency change of about 100 MHz or more occurs.

At this time, the range of switching by the second switch 164 is about 100 to 150 MHz. 5, when the second switch 164 is turned on, the variable capacitors 165 are turned off (0 pF), the resonance frequencies of 2.875 pF and 9.75 pF are respectively F1, F2 and F3, and the state in which the variable capacitor 165 is turned off (0 pF) in the off state of the second switch 164, the state connected at 2.875 pF, and the state connected at 9.75 pF The resonance frequencies are referred to as F4, F5, and F6, respectively.

At this time, F1 corresponds to F4, F2 corresponds to F5, and F3 corresponds to F6. According to Fig. 5, F1 is about 910 MHz, F2 is about 865 MHz, F3 is about 825 MHz, F4 is about 775 MHz, F5 is about 735 MHz, and F6 is about 710 MHz. When the switching range by the second switch 164 is F1, 775), 130 MHz (865-735) in the case of F2, and 115 MHz (825-710) in the case of F3.

At this time, the resonant frequency formed by the first conductive member 131 is about 700 MHz, and the resonant frequency formed by the first conductive member 131 and the third conductive member 133 is about 900 MHz. In addition, it has a band width of 700 ~ 960MHz based on 3: 1 VSWR (voltage standing wave ratio) and satisfies all low band.

In addition, in order to compensate for the frequency loss due to the hand effect, the first switch 162 and the inductor 163 are connected in parallel to the second conductive member 132, And the first switch 162 and the inductor 163 are grounded. If the first switch 162 is turned on, the frequency of about 50 MHz can be compensated.

Generally, in order to reduce the hand effect, the length of the antenna must be increased. When the length of the antenna is increased, the resonance frequency is decreased. Thus, in order to compensate for the reduced resonant frequency, in an embodiment of the present invention, a part of the current supplied by the power feeder 161 flows along the second conductive member 132, and then a part thereof flows through the first ground G1 And the other part flows to the second ground G2 by the inductor 163, so that a frequency compensation effect of increasing the length of the antenna occurs.

Inductor 163 is an element that impedes the flow of current and can be used to increase the electrical length and in one embodiment of the present invention was used to compensate for the frequency associated with the hand effect.

6 is a gain graph of the antenna device 130 according to an embodiment of the present invention. It can be seen that the capacitance of the variable capacitor 165 is varied in a state where the second switch 164 is not operated And the gain associated with the setting.

Referring to FIG. 6, the maximum value of each graph is in the range of -8 to -2 dB, which indicates a good gain. That is, it can be seen that the antenna gain of the antenna device 130 according to the embodiment of the present invention exhibits excellent characteristics depending on the states of the second switch 164 and the variable capacitor 165.

The present invention described above can be embodied as computer-readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer readable medium include a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, , And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). Also, the computer may include a control unit 180 of the terminal. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (6)

A first conductive member to which a power supply part is connected at one end;
A second conductive member having one end grounded via a first switch or an inductor and the other end connected to a point on the first conductive member;
A third conductive member having one end selectively grounded by a second switch and the other end connected to a point on the first conductive member; And
A fourth conductive member having one end grounded to ground and at least a portion of the other end spaced apart from the third conductive member,
Wherein switching of the frequency is performed by selective ground connection of the third conductive member. The method according to claim 1,
And the other end of the fourth conductive member is capacitive coupled to the third conductive member. The method according to claim 1,
And the other end of the fourth conductive member is connected by a variable capacitor. The method according to claim 1,
And the frequency is compensated by the inductor when the first switch is turned on. Terminal body; And
And an antenna device provided in the terminal body,
The antenna device includes:
A first conductive member to which a power supply part is connected at one end;
A second conductive member having one end grounded via a first switch or an inductor and the other end connected to a point of the first conductive member;
A third conductive member having one end selectively grounded by a second switch and the other end connected to a point on the first conductive member; And
And a fourth conductive member having one end grounded to ground and at least a portion of the other end spaced apart from the third conductive member,
Wherein switching of the frequency is achieved by selective ground connection of the third conductive member. 6. The method of claim 5,
And the fourth conductive member is capacitive coupled to the third conductive member.

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