KR20170067025A

KR20170067025A - Antenna module and mobile terminal

Info

Publication number: KR20170067025A
Application number: KR1020150173386A
Authority: KR
Inventors: 최재현; 정병운; 유치상; 최형철
Original assignee: 엘지전자 주식회사
Priority date: 2015-12-07
Filing date: 2015-12-07
Publication date: 2017-06-15

Abstract

housing; A rectangular metal plate mounted on the inside of the housing and having a first side longer than the second side; A power supply unit for supplying power; A first radiator positioned adjacent to a first side of the metal plate and disposed alongside the first side; A second radiator disposed along the first side of the metal plate and the first radiator; A connecting portion connecting an end of the first radiator to an end of the second radiator; A feeder for supplying power supplied from the power supply unit to the first radiator; And a ground line connecting the second radiator and the first side of the metal plate, the antenna can be laterally disposed to secure another antenna space.

Description

[0001] DESCRIPTION [0002] ANTENNA MODULE AND MOBILE TERMINAL [0003]

The present invention relates to an antenna module and a mobile terminal.

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. .

As the terminal changes into the form of multimedia devices, it is always carried around and the design elements as well as the functions become important. Thin and simple designs are gaining popularity in mobile handsets, and the appearance of a metal case can be used to improve the appearance.

However, when using a metallic case, it is necessary to use a mixture of nonconductive materials in part because it affects the performance of parts using electromagnetic waves, such as an antenna, so that collision occurs in two aspects, there is a problem.

It is an object of the present invention to provide a unified feeling of a mobile terminal appearance design by minimizing the appearance of a nonconductive material portion to the outside in order to solve the above-described problems and other problems.

A metal plate of a rectangular shape whose first side is longer than the second side; Power supply; A first radiator positioned adjacent to a first side of the metal plate and disposed alongside the first side; A second radiator disposed along the first side of the metal plate and the first radiator; A connecting portion connecting an end of the first radiator to an end of the second radiator; A feeder for supplying power from the power supply unit to the first radiator; And a ground line connecting the second radiator to a first side of the metal plate.

The first radiator extending in a first direction at the feeder and having an end connected to the second radiator through the connection; And a second pattern extending in a second direction in the feeder, wherein the first pattern and the second pattern are in a straight line.

And a coupling antenna extending in a direction different from a direction in which the first radiator extends and a direction in which the second radiator extends.

A signal of a first frequency band having a wavelength twice the length of the sum of the length of the first radiator and the length of the coupling antenna.

The second radiator extending in a first direction at the ground line and having an end connected to the first radiator through the connection; And a fourth pattern extending in the second direction on the ground line, and the third pattern and the fourth pattern may be in a straight line.

It is possible to transmit and receive a signal in a second frequency band having a wavelength twice the length of the sum of the length of the fourth pattern and the length of the second side of the metal plate.

According to another aspect of the present invention, A rectangular metal plate mounted on the inside of the housing and having a first side longer than the second side; A power supply unit for supplying power; A first radiator positioned adjacent to a first side of the metal plate and disposed alongside the first side; A second radiator disposed along the first side of the metal plate and the first radiator; A connecting portion connecting an end of the first radiator to an end of the second radiator; A feeder for supplying power supplied from the power supply unit to the first radiator; And a ground line connecting the first radiator and the first side of the metal plate.

At least one of the first radiator or the second radiator forms a part of the housing and may be exposed to the outside.

A third pattern in which the second radiator extends in the first direction at the ground line and has an end connected to the second radiator through the connection; And a fourth pattern extending in the second direction on the ground line, and the third pattern and the fourth pattern may be in a straight line.

The mobile terminal according to the present invention is advantageous in that another antenna space can be secured by disposing the antenna in the lateral direction.

Further, a broadband signal of a low frequency band can be used, and it is not necessary to provide another antenna for each region of the communication company.

Further, a metal case exposed in the lateral direction can be used, and an antenna space can be additionally secured.

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 showing a first embodiment of a mobile terminal according to the present invention, viewed from different directions.
FIG. 2 shows an embodiment of an antenna arrangement of a conventional mobile terminal and a current flow on a metal plate. The left and right direction in the drawing is the longitudinal direction of the mobile terminal.
3 is a view showing another embodiment of the antenna arrangement of the conventional mobile terminal and the current flow on the metal plate.
4 is a graph showing a characteristic mode of an antenna having the structure of FIG. 2 and FIG. 3. FIG.
5 is a diagram showing the arrangement of the first mode antenna and the current flow.
6 is a diagram showing the arrangement of the second mode antenna and the flow of current.
7 is a modified embodiment of the second mode antenna of Fig.
8 is a graph showing the performance (static standing wave ratio: VSWR (Voltage Standing Wave Ratio)) of the antenna having the structures shown in Figs. 5 to 7. Fig.
9 is a view showing another embodiment of the antenna structure of the present invention.
10 is a graph showing the static pressure standing wave ratio and efficiency of the antenna having the structure of FIG.
FIG. 11 is a diagram showing a current flow according to a frequency band when the antenna of FIG. 9 is used.

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. , &Lt; / 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 components may operate in cooperation with one another to implement a method of operation, control, or control of a 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 universal mobile terminal 100 in which a 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 first camera 121a and a first operation unit 123a are disposed on a rear side of the terminal body and a microphone 122 and an interface unit 160 are disposed on a side surface of the terminal body, 123b, a second sound output unit 152b, and a second camera 121b.

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. ). &Lt; / 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 second operation unit 123b positioned on the rear side may be disposed so as to overlap with the front display unit 151 in the thickness direction of the terminal body. For example, the second operation unit 123b may be disposed at the rear upper end portion of the terminal body so that the user can easily operate the terminal body by using the index finger when the terminal body is held with one hand. However, the present invention is not limited thereto, and the position of the second operation unit 123b may be changed.

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 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.

A metal plate 250 may be used to provide the rigidity of the mobile terminal 100 in the mobile terminal 100. The metal plate 250 may support the back surface of the display unit 151. Since the metal plate 250 includes a metal, the metal plate 250 is conductive and connected to the antenna to serve as a ground for the antenna.

The ground of the antenna itself functions as a radiator, and antenna performance may vary depending on the shape and size of the metal plate 250. In order for an antenna to transmit and receive a signal, the transmission and reception performance of a signal in a frequency band used for wireless communication must be a predetermined size or more.

Since the antenna resonates in a frequency band having a wavelength of four or two times the length of the radiator, the length of the antenna corresponds to the wavelength of the frequency used for wireless communication. It is necessary to form the metal plate 250 corresponding to the wavelength length of the resonance frequency.

When a high frequency signal is used, the shape and length of the antenna are not limited because the wavelength is short, but when the low frequency signal is used, it is difficult to secure the antenna length because the wavelength is long. For example, since the wavelength of a 0.9 GHz signal is twice as long as the wavelength of a signal of 1.8 GHz in a wireless communication, a radiator with a double length is required. For the low frequency signal band, a long radiator and metal plate 250 are needed.

The length of the antenna radiator can be adjusted by bending or extending the pattern shape to another plane, but the size of the metal plate 250 serving as a ground is limited according to the size of the mobile terminal 100, .

Accordingly, the conventional antenna is mainly disposed on the upper side or the lower side in the longitudinal direction of the mobile terminal 100. [ The metal plate 250 is disposed so that the first side of the long side extends along the longitudinal direction of the mobile terminal 100 and the second side of the metal plate 250 that is smaller than the first side extends in the width direction of the mobile terminal 100. This arrangement is advantageous in that a low frequency signal can be radiated using the long side of the metal plate 250 so that a signal transmission / reception ratio of a low frequency band is good.

The metal plate 250 may have a rectangular shape, and the metal plate 250 may have a rectangular shape that is longer than the second side of the metal plate 250. For example, Shape will be described with reference to the embodiment having the shape.

When a signal is transmitted and received by the wireless communication unit, a current flows in the longitudinal direction of the metal plate 250. Fig. 2 shows an embodiment of the antenna arrangement of the conventional mobile terminal 100 and the flow of current on the metal plate 250, wherein the first side is a side extending in the longitudinal direction in the drawing and the second side is a side And is a side extending in the horizontal direction. For convenience of explanation, the direction in which the first side extends is described as the lateral direction in which the second side extends in the longitudinal direction.

2 (a) is a conventional antenna structure having an antenna radiator 10 positioned at one side in the longitudinal direction of the mobile terminal 100. The antenna radiator 10 has a second side In the lateral direction. The antenna radiator 10 is grounded to the metal plate 250 through a ground line 12 and the main substrate 185 is electrically connected to the antenna radiator 10 from a power supply unit 190 through a feeder 11, . The current flows in the longitudinal direction of the metal plate 250 as shown in FIG. 2 (b) due to the radiator 10 positioned apart from the longitudinal end of the metal plate 250, Signal. &Lt; / RTI >

3 is a view showing another embodiment of the antenna arrangement of the conventional mobile terminal 100 and the current flow on the metal plate 250. Fig. 3 (a) shows an arrangement in the case of using the antenna radiator 20 disposed in parallel with the first side of the metal plate 250. Fig. The antenna radiator 20 is grounded to the metal plate 250 through a ground line 22 and the main substrate 185 is electrically connected to the antenna radiator 20 from a power supply unit 190 through a feeder 21, . In this arrangement, as shown in FIG. 3 (b), a current flows in the lateral direction parallel to the second side of the metal plate 250.

FIG. 4 is a graph showing a characteristic mode of an antenna having the structure of FIG. 2 and FIG. 3. The horizontal axis represents frequency and the vertical axis represents eigenmode. The graph must be close to zero to ensure performance. lambda ₁ denotes the eigenmode of the antenna shown in Fig. ₂ and lambda ₂ denotes the eigenmode of the antenna shown in Fig.

As the frequency increases, the graph becomes closer to 0, and the values in the low-band frequency range around 0.9 GHz are different. An embodiment (the embodiment of FIG. 2) in which the antenna radiator extends in the lateral direction parallel to the second side and is disposed adjacent to the second side exhibits a value close to 0 in the frequency band of 0.9 GHz, so that it can be used as an antenna in the low frequency band On the other hand, in the embodiment where the antenna radiator is disposed adjacent to the first side (the embodiment of FIG. 3), the transmission / reception efficiency of signals in the low frequency band (about 0.9 GHz) is lowered because of the value of -8 to -6.

This results in different results depending on the arrangement of the metal plate 250 serving as a ground. When a current flows in the short side direction of the metal plate 250, the length of the radiator (including the ground) is reduced to 1/2 of the wavelength length of the low- It is because it does not reach. The performance degradation can be prevented by extending the second side length of the metal plate 250 or by changing the current flow in the direction parallel to the first side.

Recently, as the wireless communication technology applied to the mobile terminal 100 is diversified, antennas for a plurality of wireless communication systems are required. There is a problem that the antenna is disposed in addition to the antenna radiators disposed only on the upper and lower sides of the mobile terminal 100. This necessitates placing the antenna on the side surface of the mobile terminal. However, there is a problem that the performance of the antenna disposed on the side surface of the mobile terminal deteriorates as described above.

Hereinafter, an antenna radiator arranged in a direction parallel to the first side of the metal plate 250 will be described based on an improved embodiment of the antenna radiator to solve the above problem.

5 is a diagram illustrating a mobile terminal 100 according to an aspect of the present invention.

The present embodiment includes a metal plate 250 and a first radiator 210 extending in the longitudinal direction in parallel with the first sides of the metal plate 250 and a second radiator 210 disposed in parallel with the first radiator 210. [ A feeder 240 for supplying power to the first radiator 210 and a ground line 245 for connecting the second radiator 220 and the metal plate 250.

The first radiator 210 disposed in parallel with the first side is connected to the power supply unit 190 through the feeder 240 and the second radiator 220 is connected to the ground through the ground line 245. [ do. The first radiator 210 and the second radiator 220 may be connected to each other through a connection part 230 so that the length of the entire antenna radiator may be longer than the length of the first side of the metal plate 250.

The ground line 245 connected to the metal plate 250 of the present embodiment is located at one end of the second radiator 220 so that the flow of current in the metal plate 250 is reduced as shown in FIG. And flows in one direction. The first radiator 210 extends in the length direction corresponding to the length of the first side so that the first radiator 210 flows in a direction opposite to the flow in the metal plate 250 and balances the current flow. The first radiator 210 includes a first pattern 211 extending in a first direction around a point where the feeder 240 is connected and a second pattern 212 extending in a second direction opposite to the first direction , And the first pattern 211 and the second pattern 212 may be straight lines as shown in FIG. 5 (a).

5, even if the antenna radiators 210 and 220 located in the lateral direction of the mobile terminal 100 are used, the antenna radiator 210 and the antenna radiator 210 are arranged in the longitudinal direction of the metal plate 250 Direction) and the radiator is positioned on the upper side or the lower side of the mobile terminal 100 (Fig. 2).

Hereinafter, the antenna in which the current flows in the longitudinal direction parallel to the first side of the metal plate 250 will be referred to as a 'first mode antenna'. FIG. 8 is a graph showing the performance (voltage standing wave ratio) of an antenna having the structures of FIGS. 5 to 7, wherein a graph of a first mode antenna (first mode antenna) And a low static pressure standing wave ratio. That is, it can resonate with signals in the frequency range of 0.9 GHz to 0.92 GHz to transmit and receive signals.

At this time, the coupling part 230 may further include a coupling pattern 235 extending in a direction opposite to the first radiator 210 and the second radiator 220 so as to be resonated at a desired frequency. The resonance frequency can be slightly changed depending on the length of the coupling pattern 235. [

Because wireless communication frequencies use different frequency bands for different countries or carriers, some countries use signals with frequencies below 1 GHz. In order to utilize signals of this frequency band, a first mode antenna and another type of antenna may be considered.

6 is a view showing the arrangement of the second mode antenna and the current flow, and has a structure in which a current flows in a lateral direction parallel to the second side of the metal plate 250 as shown in Fig. The antenna of this embodiment includes a first radiator 210 and a second radiator 220, a connection part 230 connecting the first radiator 210 and the second radiator 220, And a ground line 245 connecting and grounding the metal plate 250 with the feeder 240 and the second radiator 220.

6A, the length of the second radiator 220 connected by the metal plate 250 and the ground line 245 is longer and the length of the first radiator 210 is shorter than that of the first mode antenna described above . The conventional lateral antenna of Fig. 3, in which the radiator is positioned, is current flowing in the transverse direction of the metal plate 250, and the length of the second side of the metal plate 250 is set so as to solve the short problem of transmitting a low- The length of the second radiator 220 is further extended.

6A, the second radiator 220 includes a third pattern 221 extending in a first direction around a ground line 245 connected to the metal plate 250, And a fourth pattern 222 extending in a second direction opposite to the first direction. The third pattern 221 is connected to the first radiator 210 and the end of the fourth pattern 222 is open (not connected to another structure).

Referring to FIG. 6 (b), a current flows through the metal plate 250 while looping in a symmetrical shape about a position where the ground line 245 is connected. At this time, the fourth pattern 222 may extend the current flowing in the transverse direction in the metal plate 250 to provide the length of the radiator corresponding to the wavelength of the low-frequency signal. The antenna in which the current flows in the lateral direction parallel to the second side of the metal plate 250 is referred to as a second mode antenna.

Referring to FIG. 8, the second mode antenna 2 has the lowest static pressure standing wave ratio at a frequency of 0.88 GHz, and the resonance frequency is 0.88 GHz, unlike the first mode antenna. However, since the static pressure standing wave ratio is larger than that of the first mode antenna or the conventional antenna, it is necessary to lower the static pressure standing wave ratio in order to improve the performance.

7 is a modified embodiment of the second mode antenna of Fig. The length of the first radiator 210 is longer than that of the embodiment of FIG. Since the third pattern 221 and the fourth pattern 222 of the second radiator 220 extend in different directions about the ground line 245 regardless of the length of the first radiator 210, Current flows through metal plate 250 in the same manner as b). However, since the length of the first radiator 210 is increased, the signal is stably flowed, and the antenna performance is improved.

8, the static pressure standing wave ratio of the second mode antenna 2 (second mode antenna 2) is lowered. Unlike the first mode antenna, the antenna can transmit and receive a signal of a frequency band different from that of the first mode antenna while resonating in the frequency band of 0.88 GHz.

7 and the antenna pattern of FIG. 5, the second pattern 212 and the third pattern 221 of the first radiator 210 are common, and the first mode antenna adds the coupling pattern 235 And the second mode antenna further comprises a fourth pattern 222. [ Since there is a common portion, a radiator of the type shown in Fig. 9 can be used to provide an antenna for transmitting and receiving signals in two frequency bands.

9 is a view showing another embodiment of the antenna structure of the present invention. The antenna structure of the embodiment of FIG. 8 includes a metal plate 250, a first radiator 210 having a first pattern 211 and a second pattern 212, a third pattern 221 and a fourth pattern 222, A coupling part 230 connecting the first radiator 210 and the second radiator 220, a coupling pattern 235 extending from the coupling part 230, a first radiator 210, And a ground line 245 connecting the second radiator 220 and the metal plate 250. The feeder 240 is connected to the first radiator 220 and the metal plate 250,

FIG. 10 is a graph showing the static pressure standing wave ratio and efficiency of the antenna having the structure of FIG. 9. In the antenna of this embodiment, a first resonance mode (first resonance mode) resonating with a signal near 0.92 GHz, And a second resonance mode for resonating with a signal in the vicinity of 0.87 GHz, which is the resonance frequency of the second mode antenna. That is, all signals in the frequency band of 0.845 GHz to 0.94 GHz can be used.

General Ant. Is a diagram showing the performance and efficiency of the antenna of FIG. 3 in which the antenna radiator 20 disposed side by side on the first side of the metal plate 250 is located. In the resonance frequency (First Resonance Mode) of the first mode antenna, Since only the signal near 0.92 GHz is resonated, the usable frequency band is narrower than the frequency band of this embodiment. FIG. 10B is a graph showing the intensity of a signal. The antenna efficiency of the present embodiment is increased by about 30% at 0.9 GHz compared to a conventional antenna.

FIG. 11 is a view showing a current flow according to a frequency band when the antenna of FIG. 9 is used. In the case of transmitting and receiving a signal in the vicinity of 0.87 GHz, the portion where the ground line 245 is connected is centered The flow of the metal plate 250 in the left-right symmetry can be confirmed. That is, it shows a current flow of the same type as that of the second mode antenna of Fig.

When a signal in the vicinity of 0.92 GHz is transmitted and received, a current flows in the longitudinal direction of the metal plate 250 as shown in FIG. 11 (b), which shows the same current flow as the first mode antenna of FIG.

The antenna of the present embodiment can use both the first mode frequency band (0.89 GHz to 0.94 GHz) and the second mode frequency band (0.85 GHz to 0.89 GHz) to realize broadband wireless communication.

In addition, by positioning the antenna in the lateral direction of the mobile terminal 100, different antennas are disposed on the upper side and the lower side, and various types of wireless communication are possible. Further, since only one side of the mobile terminal 100 is used in the lateral direction, another antenna can be disposed on the opposite side.

At least one of the first radiator 210 and the second radiator 220 positioned in the lateral direction of the mobile terminal 100 may form a part of the side case exposed to the outside of the mobile terminal 100. Recently, the preference for a case made of a metal has been increased. Therefore, by using a metallic case on the side, the antenna of the present invention can be realized without separately providing an antenna mounting space.

The mobile terminal 100 according to the present invention is advantageous in that it can secure another antenna space by disposing the antenna in the lateral direction.

The foregoing detailed description should not be construed in all aspects as limiting 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.

100: mobile terminal 110: wireless communication unit
120: input unit 140: sensing unit
150: output unit 160: interface unit
170: memory 180:
185 main substrate 190 power supply
210: first radiator 211: first pattern
212: second pattern 220: second emitter
221: third pattern 222: fourth pattern
230: connection 235: coupling pattern
240: feeder 245: ground line
250: metal plate

Claims

A metal plate of a rectangular shape whose first side is longer than the second side;
Power supply;
A first radiator positioned adjacent to a first side of the metal plate and disposed alongside the first side;
A second radiator disposed along the first side of the metal plate and the first radiator;
A connecting portion connecting an end of the first radiator to an end of the second radiator;
A feeder for supplying power from the power supply unit to the first radiator; And
And a ground line connecting the second radiator to a first side of the metal plate.

The method according to claim 1,
The first radiator
A first pattern extending from the feeder in a first direction and having an end connected to the second radiator through the connection; And
And a second pattern extending in a second direction in the feeder,
Wherein the first pattern and the second pattern form a straight line.

3. The method of claim 2,
Further comprising a coupling antenna extending in a direction different from an extending direction of the first radiator and an extending direction of the second radiator at the connection portion.

The method of claim 3,
Wherein the antenna module transmits and receives a signal in a first frequency band having a wavelength twice the length of the sum of the length of the first radiator and the length of the coupling antenna.

The method according to claim 1,
The second radiator
A third pattern extending in the first direction at the ground line and having an end connected to the first radiator through the connection; And
And a fourth pattern extending in the second direction at the ground line,
And the third pattern and the fourth pattern form a straight line.

6. The method of claim 5,
And transmits and receives a signal in a second frequency band of a wavelength having a length twice the sum of the length of the fourth pattern and the length of the second side of the metal plate.

housing;
A rectangular metal plate mounted on the inside of the housing and having a first side longer than the second side;
A power supply unit for supplying power;
A first radiator positioned adjacent to a first side of the metal plate and disposed alongside the first side;
A second radiator disposed along the first side of the metal plate and the first radiator;
A connecting portion connecting an end of the first radiator to an end of the second radiator;
A feeder for supplying power supplied from the power supply unit to the first radiator; And
And a ground line connecting the first radiator and the first side of the metal plate.

8. The method of claim 7,
Wherein at least one of the first radiator and the second radiator forms a part of the housing and is exposed to the outside.

8. The method of claim 7,
The first radiator
A first pattern extending in the first direction at the feeder and having an end connected to the second radiator through the connection; And
And a second pattern extending in the second direction at the feeder,
Wherein the first pattern and the second pattern form a straight line.

10. The method of claim 9,
Further comprising a coupling antenna extending in a direction different from an extension direction of the first radiator and an extension direction of the second radiator at the connection portion.

11. The method of claim 10,
And transmits and receives a signal in a first frequency band of a wavelength having a length twice the sum of the length of the first radiator and the length of the coupling antenna.

8. The method of claim 7,
The second radiator
A third pattern extending in the first direction at the ground line and having an end connected to the second radiator through the connection; And
And a fourth pattern extending in the second direction at the ground line,
And the third pattern and the fourth pattern form a straight line.

13. The method of claim 12,
And transmits and receives a signal in a second frequency band of a wavelength having a length twice the sum of the length of the fourth pattern and the length of the second side of the metal plate.