KR102243660B1 - Mobile terminal - Google Patents

Abstract

main body; A plate-shaped metal plate mounted on the main body; A first radiator having one end coupled to the metal plate through a connection part and extending in a first direction by being spaced apart from the metal plate from the connection part; A first feeder connected to the first radiator to supply power; Auxiliary emitter; And a first switch for turning ON/OFF the connection between the auxiliary radiator and the first feeder. The mobile terminal has an advantage of enabling broadband matching without deterioration of antenna impedance matching. In addition, by changing the resonant frequency, signals of different frequency bands can be used simply.

Description

Mobile terminal {MOBILE TERMINAL}

The present invention relates to a mobile terminal having an antenna for transmitting and receiving wireless communication.

Terminals can be divided into mobile/portable terminals and stationary terminals depending on whether they can be moved. Again, mobile terminals can be divided into handheld terminals and vehicle mounted terminals according to whether or not the user can directly carry them.

The functions of mobile terminals are diversifying. For example, there are functions of data and voice communication, taking pictures and videos through a camera, recording voices, playing music files through a speaker system, and outputting images or videos to the display unit. Some terminals add an electronic game play function or perform a multimedia player function. In particular, recent mobile terminals can receive multicast signals providing visual content such as broadcasting and video or television programs.

As functions are diversified, such a terminal is in the form of a multimedia player with complex functions such as, for example, taking photos or videos, playing music or video files, and receiving games and broadcasts. It is being implemented.

In the conventional mobile communication system, a single antenna is mainly used, but as its function is diversified, the types of antennas have also been diversified. A plurality of antennas are mounted for various types of wireless communication such as satellite communication, short-range wireless communication such as WIFI, NFC, and Bluetooth, and DMB, as well as LTE communication, 2G, and 3G communication for phone calls and data communication.

Since antennas transmit and receive electromagnetic waves, there may be interference with each other. In particular, when a metal member is located inside or outside the mobile terminal, the signal is affected. Therefore, the design of an antenna that can minimize interference from surrounding metals or antennas is difficult. very important.

An object of the present invention is to provide a mobile terminal having an antenna using metal parts such as a metal frame inside a mobile terminal or a metal case in an exterior case.

main body; A plate-shaped metal plate mounted on the main body; A first radiator having one end coupled to the metal plate through a connection part and extending in a first direction by being spaced apart from the metal plate from the connection part; A first feeder connected to the first radiator to supply power; Auxiliary emitter; And a first switch for turning ON/OFF the connection between the auxiliary radiator and the first feeder.

The auxiliary radiator may include a first branch pattern whose one end is connected to the first radiator.

The first switch may have a variable position connected to the first branch pattern.

When the first switch is OFF, it may resonate with a signal corresponding to a first frequency having a wavelength of 4 times the length of the connection part and the first feeder.

When the first switch is ON, the connection part, the first feeder, the first branch pattern, and the first feeder form a loop so that a current flows along the loop, and a wavelength of twice the length of the loop It can resonate with a signal corresponding to the second frequency having.

One end further includes a second branch pattern connected to the power supply and extending in a first direction, wherein the first branch pattern extends in a second direction opposite to the first direction, and the other end is the second branch pattern It can be arranged adjacent to the other end of the.

The first radiator may resonate with a third frequency having a wavelength four times the length of the first branch pattern, or a fourth frequency having a wavelength four times the length of the second branch pattern. have.

The auxiliary radiator includes a third radiator disposed at a location different from the first radiator and spaced apart from the metal plate and connected to the metal plate at one end, and when the transmission/reception efficiency of a signal through the first radiator is less than a reference value, the It may further include a control unit for turning on the first switch to be connected to the third radiator.

The first feeder and a second switch for turning on / off the connection of the first radiator, the control unit, when the first switch is OFF, the second switch is ON, and when the first switch is ON The second switch may be turned off.

The first radiator is a side metal case disposed on the side of the main body, the third radiator is disposed on the front or inside of the main body, and the control unit turns the first switch on when a user contacts the side metal case. It can be turned on.

A second radiator having one end coupled to the connecting part and extending in a direction opposite to the first radiator; And a second feeder supplying power to the second radiator.

The length of the second radiator may be shorter than the length of the first radiator.

The first feeder may include a power line connected to a power source; A delay line extending in the same direction as the first radiator; And a supply line connected to the first radiator.

The first switch may be connected to the delay line.

The first radiator may resonate with a third frequency having a wavelength of four times the length of the delay line.

It may further include an injection material filling between the metal plate and the first radiator.

The first radiator may be disposed outside the mobile terminal.

A part of the first radiator may be disposed inside the mobile terminal, and a part of the first radiator may be exposed outside the mobile terminal.

According to at least one embodiment of the present invention, there is an advantage in that broadband matching is possible without deterioration in antenna impedance matching. In addition, by changing the resonant frequency, signals of different frequency bands can be used simply.

Further scope of the applicability of the present invention will become apparent from the detailed description below. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, specific embodiments such as the detailed description and preferred embodiments of the present invention should be understood as being given by way of example only.

1A is a block diagram illustrating a mobile terminal related to the present invention.
1B and 1C are conceptual diagrams of an example of a mobile terminal related to the present invention as viewed from different directions.
2 is an exploded perspective view showing an example of a mobile terminal related to the present invention.
3 is a diagram illustrating a slot antenna of a mobile terminal according to the present invention.
4 is a conceptual diagram showing a schematic configuration of an antenna of a mobile terminal according to the present invention.
5 is a perspective view showing an example of a state in which a middle frame and a main board of a mobile terminal related to the present invention are combined.
6 is a cross-sectional view showing an example of a mobile terminal related to the present invention.
7 is a plan view showing another example of an antenna of a mobile terminal according to the present invention.
8 is a perspective view showing another example of an antenna of a mobile terminal according to the present invention.
9 is a plan view showing an embodiment of a first antenna of a mobile terminal according to the present invention.
10 is a view for explaining another example of the first antenna of FIG. 9.
11 is a cross-sectional view of FIG. 9.
12 is a graph showing the antenna efficiency of FIG. 9.
13 is a plan view showing another embodiment of a first antenna of a mobile terminal according to the present invention. 14 is a cross-sectional view of FIG. 13.
15 is a graph showing the antenna efficiency of FIG. 13.
16 is a plan view showing another embodiment of a first antenna of a mobile terminal according to the present invention.
17 is a cross-sectional view of FIG. 16.
18 is a graph showing signal strength in a low frequency band.
19 is a diagram illustrating a current flow through the antenna of FIG. 16.
20 is a diagram showing a modified example of the embodiment of FIG. 16.
21 is a plan view showing an embodiment of a second antenna of a mobile terminal according to the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for constituent elements used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Mobile terminals described herein include mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, and slate PCs. , Tablet PC, ultrabook, wearable device, for example, smartwatch, smart glass, head mounted display (HMD), etc. have.

However, it will be readily apparent to those skilled in the art that the configuration according to the embodiment described in the present specification may also be applied to fixed terminals such as digital TVs, desktop computers, and digital signage, except when applicable only to mobile terminals. will be.

1A to 1C, FIG. 1A is a block diagram illustrating a mobile terminal related to the present invention, and FIGS. 1B and 1C are conceptual views of an example of a mobile terminal related to the present invention viewed from 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 the mobile terminal, and thus, the mobile terminal described in the present specification may have more or fewer components than those listed above.

More specifically, among the above components, the wireless communication unit 110 is provided between the mobile terminal 100 and the wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or between the mobile terminal 100 and an external server. It may include one or more modules to enable wireless communication between. In addition, the wireless communication unit 110 may include one or more modules that connect the mobile terminal 100 to one or more networks.

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

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

The sensing unit 140 may include one or more sensors for sensing at least one of information in the mobile terminal, information on surrounding environments surrounding the mobile terminal, and user information. For example, the sensing unit 140 includes a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, and gravity. Sensor (G-sensor), gyroscope sensor (gyroscope sensor), motion sensor (motion sensor), RGB sensor, infrared sensor (IR sensor: infrared sensor), fingerprint sensor (finger scan sensor), ultrasonic sensor (ultrasonic sensor) , Optical sensor (for example, camera (see 121)), microphone (microphone, see 122), battery gauge, environmental sensor (for example, barometer, hygrometer, thermometer, radiation detection sensor, It may include at least one of a heat sensor, a gas sensor, etc.), and a chemical sensor (eg, an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification may combine and utilize information sensed by at least two or more of these sensors.

The output unit 150 is for generating an output related to visual, auditory or tactile sense, and includes at least one of the display unit 151, the sound output unit 152, the hap tip module 153, and the light output unit 154. can do. The display unit 151 may implement a touch screen by forming a layer structure or integrally with the touch sensor. Such a 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 passage between various types of external devices connected to the mobile terminal 100. The interface unit 160 connects a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, and a device equipped with an identification module. It may include at least one of a port, an audio input/output (I/O) port, an input/output (video I/O) port, and an earphone port. The mobile terminal 100 may perform appropriate control related to the connected external device in response to the connection of the external device to the interface unit 160.

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 (application programs or applications) driven by the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these application programs may be downloaded from an external server through wireless communication. In addition, at least some of these application programs may exist on the mobile terminal 100 from the time of delivery for basic functions of the mobile terminal 100 (eg, incoming calls, outgoing functions, message reception, and outgoing functions). Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and driven by the controller 180 to perform an operation (or function) of the mobile terminal.

In addition to the operation related to the application program, the controller 180 generally controls the overall operation of the mobile terminal 100. The controller 180 may provide or process appropriate information or functions to a user by processing signals, data, information, etc. input or output through the above-described components or by driving an application program stored in the memory 170.

Also, in order to drive an application program stored in the memory 170, the controller 180 may control at least some of the components discussed with reference to FIG. 1A. Further, in order to drive the application program, the controller 180 may operate by combining at least two or more of the components included in the mobile terminal 100 with each other.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to each of the components included in the mobile terminal 100. The power supply unit 190 includes a battery 191 (see FIG. 1C), and the battery 191 may be a built-in battery or a replaceable battery.

At least some of the components may operate in cooperation with each other to implement an operation, control, or control method 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.

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 watch type, a clip type, a glass type, or a folder type in which two or more bodies are relatively movably coupled, a flip type, a slide type, a swing type, and a swivel type. . Although it will relate to a specific type of mobile terminal, the description of a specific type of mobile terminal can be generally applied to other types of mobile terminals.

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

The mobile terminal 100 includes a case (eg, a frame, a housing, a cover, etc.) forming an exterior. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in an 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 the front of the terminal body to output information. As illustrated, the window 151a of the display unit 151 may be mounted on the front case 101 to form the front surface of the terminal body together with the front case 101.

In some cases, electronic components may be mounted on the rear case 102 as well. Electronic components that can be mounted on the rear case 102 include a detachable battery 191, an identification module, and a memory card. In this case, a rear cover 103 for covering the mounted electronic component may be detachably coupled to the rear case 102. Accordingly, when the rear cover 103 is separated from the rear case 102, the electronic components 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 part of the side of the rear case 102 may be exposed. In some cases, when the rear case 102 is combined, the rear case 102 may be completely covered by the rear cover 103. Meanwhile, the rear cover 103 may be provided with an opening for exposing the camera 121b or the sound output unit 152b to the outside.

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

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

Meanwhile, the mobile terminal 100 may include a waterproof unit (not shown) that prevents water from permeating into the terminal body. For example, the waterproof unit 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 the combination thereof It may include a waterproof member that seals the inner space of the city.

The mobile terminal 100 includes 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, and first and second sound output units. Cameras 121a and 121b, first and second operation units 123a and 123b, microphone 122, interface unit 160, and the like may be provided.

Hereinafter, as shown in FIGS. 1B and 1C, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, and a light output unit ( 154), a first camera 121a and a first operation unit 123a are disposed, a second operation unit 123b, a microphone 122 and an interface unit 160 are disposed on the side of the terminal body, and the terminal body The mobile terminal 100 in which the second sound output unit 152b and the second camera 121b are disposed on the rear surface of will be described as an example.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as necessary, or may be disposed on different sides. For example, the first manipulation 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 of the terminal body rather than on 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 in the mobile terminal 100, or UI (User Interface) and GUI (Graphic User Interface) information according to such execution screen information. .

The display unit 151 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display. display), a 3D display, and an e-ink display.

In addition, two or more display units 151 may exist depending on the implementation form of the mobile terminal 100. In this case, in the mobile terminal 100, a plurality of display units may be spaced apart or integrally disposed on one surface, or may be disposed on different surfaces, respectively.

The display unit 151 may include a touch sensor that senses a touch on the display unit 151 so as to receive a control command by a touch method. By using this, when a touch is made to the display unit 151, the touch sensor detects the touch, and the controller 180 may be configured to generate a control command corresponding to the touch based on this. The contents input by the touch method may be letters or numbers, or menu items that can be indicated or designated in various modes.

Meanwhile, the touch sensor is formed in a film form having a touch pattern and is disposed between the window 151a and a display (not shown) on the rear surface of the window 151a, or is a metal wire patterned directly on the rear surface of the window 151a. May be. Alternatively, the touch sensor may be integrally formed with the display. For example, the touch sensor may be disposed on a substrate of the display or may be provided inside the display.

As such, the display unit 151 may form a touch screen together with a touch sensor, and in this case, the touch screen may 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 manipulation unit 123a.

The first sound output unit 152a may be implemented as a receiver that transmits a call sound to a user's ear, and the second sound output unit 152b is a loud speaker that outputs various alarm sounds or multimedia playback sounds. It can be implemented in the form of ).

A sound hole for emitting sound generated from the first sound output unit 152a may be formed in the window 151a of the display unit 151. However, the present invention is not limited thereto, and the sound may be configured to be emitted along an assembly gap between structures (eg, a gap between the window 151a and the front case 101). In this case, the externally formed hole for sound output is not visible or hidden, so that the appearance of the mobile terminal 100 may be more simple.

The light output unit 154 is configured to output light for notifying when an event occurs. Examples of the event include message reception, call signal reception, missed call, alarm, schedule notification, e-mail reception, and information reception through an application. When the user's event confirmation is detected, the controller 180 may control the light output unit 154 to terminate the output of light.

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

The first and second manipulation units 123a and 123b are an example of the user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100, and may also be collectively referred to as a manipulating portion. have. The first and second manipulation units 123a and 123b may be employed in any manner as long as the user operates while receiving a tactile feeling, such as touch, push, and scroll. In addition, the first and second manipulation units 123a and 123b may also be employed in a manner in which the first and second manipulation units 123a and 123b are manipulated without a user's tactile feeling through proximity touch, hovering touch, or the like.

In this drawing, the first manipulation unit 123a is illustrated as a touch key, but the present invention is not limited thereto. For example, the first manipulation unit 123a may be a push key (mechanical key) or may be configured as a combination of a touch key and a push key.

Contents input by the first and second manipulation units 123a and 123b may be set in various ways. For example, the first operation unit 123a receives commands such as menu, home key, cancel, search, etc., and the second operation unit 123b is output from the first or second sound output units 152a, 152b. Commands such as adjusting the volume of sound and switching to the touch recognition mode of the display unit 151 may be input.

Meanwhile, as another example of the user input unit 123, a rear input unit (not shown) may be provided on the rear surface of the terminal body. This rear input unit is manipulated 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, scroll, etc., control the volume of sound output from the first and second sound output units 152a and 152b, and touch recognition mode of the display unit 151 You can receive commands such as conversion of. The rear input unit may be implemented in a form capable of inputting by a touch input, a push input, or a combination thereof.

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

When the rear input unit is provided on the rear side of the terminal body, a new type of user interface can be implemented using the rear input unit. In addition, when the touch screen or the rear input unit described above replaces at least some functions of the first manipulation unit 123a provided on the front of the terminal body, and the first manipulation unit 123a is not disposed on the front of the terminal body, The display unit 151 may be configured with a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing a user's fingerprint, and the controller 180 may use the fingerprint information sensed through the fingerprint recognition sensor as an 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 a user's voice and other sounds. The microphone 122 may be provided at a plurality of locations and configured to receive stereo sound.

The interface unit 160 becomes a passage through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 is a connection terminal for connection with another device (eg, earphone, external speaker), a port for short-range communication (eg, an infrared port (IrDA Port), a Bluetooth port (Bluetooth)). Port), a wireless LAN port, etc.], or at least one of a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 may be implemented in the form of a socket for accommodating an external card such as a Subscriber Identification Module (SIM) or a User Identity Module (UIM), or a memory card for storing information.

A second camera 121b may be disposed on the rear surface of the terminal body. In this case, the second camera 121b has a photographing direction substantially opposite to 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 format. Such a camera may be referred to as an'array' camera. When the second camera 121b is configured as an array camera, an image may be photographed in various ways using a plurality of lenses, and an image of better quality may be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 illuminates light toward the subject when photographing the subject with the second camera 121b.

A second sound output unit 152b may be additionally disposed on 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 to implement a speakerphone mode during a call.

At least one antenna for wireless communication may be provided in the terminal body. The antenna may be embedded in the terminal body or may be formed in a case. For example, an antenna forming a part of the broadcast receiving module 111 (refer to FIG. 1A) may be configured to be retractable 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 (refer to FIG. 1A) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 that is built into the terminal body or configured to be 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 enable wireless charging through a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

On the other hand, in this drawing, the rear cover 103 is coupled to the rear case 102 to cover the battery 191 to limit the separation of the battery 191 and protect the battery 191 from external shocks and foreign substances. It is exemplifying. When the battery 191 is configured to be detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

An accessory that protects the exterior of the mobile terminal 100 or assists or expands the function of the mobile terminal 100 may be added. An example of such an accessory may be a cover or a pouch that covers or accommodates at least one surface of the mobile terminal 100. The cover or pouch may be configured to interlock with the display unit 151 to expand functions of the mobile terminal 100. Another example of an accessory may be a touch pen for assisting or extending a touch input to a touch screen.

2 is an exploded perspective view showing an example of a mobile terminal 100 related to the present invention. Referring to FIG. 2, the mobile terminal 100 includes the display unit 151 and a window 151a positioned in front of the display unit 151. The window 151a may have a peripheral portion coupled to the circumference of one surface of the front case 101 to fix the display unit 151.

The display unit 151 is supported between the front case 101 and the rear case 102, electrical elements are mounted, and a middle frame 105 may be interposed to provide rigidity to the mobile terminal 100. In the middle frame 105, a display unit 151 is disposed on the front side, and a camera 121a, an audio output unit 152a, a user input unit 131a, and the like are disposed around the front.

The rear of the middle frame 105 is provided with a battery seating portion on which the main substrate 185 and the battery are seated, and an antenna for wireless communication, a USB port 161 for connecting to an external device, or an ear jack 162. An interface 160 and the like are disposed.

The middle frame 105 forms a first frame 1051 using a metal material such as magnesium for stiffness, and inserts the first frame 1051 to cover a resin, which is an insulating material, around the second frame ( 1055). The first frame 1051 provides rigidity to the mobile terminal 100 and functions as a ground, so that an electronic component such as the main substrate 185 or an antenna may be connected and grounded.

Since the second frame 1055 uses an injection molding method, the degree of freedom in shape is higher than that of the first frame 1051 made of metal. In the case of a member that is easy to form unevenness and should not be in electrical contact with the first frame 1051, it may be mounted on the second frame 1055.

A main substrate 185 and a battery 191 are disposed on the rear surface of the middle frame 105. The battery 191 is thicker than other members, and in order to minimize the overlapping of the battery 191 and other members, the main board 185, the interface unit, the USIM card or memory are avoided from the part where the battery 191 is mounted. A card slot on which a card is mounted, a camera at the rear, an audio output module at the rear, and the like may be disposed.

The first main board 185a on the upper side and the second main board 185b on the lower side are arranged for electrical connection between the parts disposed at the top and the parts disposed at the bottom based on the battery 191, and the first main board ( It may be configured as a connection substrate 185c connecting between the 185a and the second main substrate 185b. Since the connection board 185c is a signal connection path between two boards and has no purpose for mounting other components, a flexible printed circuit board having a weak support may be used.

The first main substrate 185a on the upper side includes an application processor (AP) chip for driving the mobile terminal 100 and an integrated circuit (IC) for driving various types of driving, and a camera, a rear input unit, and the like may be disposed. An interface such as a USB port 161 or an ear jack 162 and a speaker may be disposed at the lower end.

In addition, antennas for wireless communication are disposed at the top and bottom of the mobile terminal 100. As the functions of the mobile terminal 100 are diversified, various types of antennas are used, so that the antenna can be mounted using both the upper and lower ends. Each antenna operates independently because the frequency bands and methods of transmitting and receiving are different, but since they emit electromagnetic waves, there is a problem that they interfere with each other.

If mutual interference occurs, the transmission/reception rate of radio signals decreases sharply, so it is preferable to arrange them apart from each other as much as possible. In addition, since the side is a part that the user holds by hand while using the mobile terminal 100, the transmission/reception rate of the wireless signal may be lowered by the user's hand, and can be distributed at the top and bottom.

The antenna used for the mobile terminal 100 is a main antenna for wireless communication with the base station of the mobile terminal 100 for phone calls or data communication. It should be possible.

The main antenna may be placed on one side of the mobile terminal 100 (lower side in this embodiment), and a sub-antenna may be placed on the other side of the mobile terminal 100 to supplement the function of the main antenna. In addition, an antenna for short-range wireless communication such as Bluetooth or Wi-Fi is required, and a GPS antenna for communication between a global positioning system (GPS) and a satellite is also mounted.

Each antenna differs according to the wireless communication method, and in particular, wireless communication between the base station of the telecommunication company in charge of the main antenna and the auxiliary antenna not only transmits and receives signals according to different standards for each telecommunication company or country, but also various frequency bands for one telecommunication company. It transmits and receives signals through. Broadband antennas capable of transmitting and receiving signals at broadband frequencies are used in order to enable wireless communication at other frequencies when not operating at a specific frequency depending on regions or circumstances.

However, as the size of the mobile terminal 100 decreases and the distance between the parts becomes closer, the influence of the parts around the antenna increases.

Accordingly, the mobile terminal of the present invention minimizes the influence from peripheral devices by using a slot antenna. The slot antenna refers to an antenna capable of wireless communication by supplying power to a conductor having an elongated opening and emitting a radio wave through the opening portion by a current distributed on the surface of the conductor.

A typical slot antenna operates so that the slot antenna becomes a radiator of radio waves by drilling a long and blocked slot in one direction on the wall of the waveguide, the surface of a cylindrical conductor, or a flat conductor plate and feeding the slotted portion so that an electric field is formed in the slot. Let it. The slot antenna with both ends blocked must have a length of at least λ/2 of the wavelength of the frequency to be transmitted/received, and there is a limit to reducing the length of the slot. By improving the closed slot antenna on both sides and using an open slot antenna, the length of the slot (D) becomes λ/4, which is sufficient to reduce the size of the antenna slot. Can be reduced to

3 is a conceptual diagram for explaining a conventional slot antenna. (a) shows the impedance and current in the case of radiating radio waves in the half-wavelength frequency band in the slot antenna with one side connected to the feeder 2 connected to the D1 distance from the blocked part (1a) of the slot (1). It shows the relationship.

The dotted line indicates the magnitude of the impedance, and the arrow indicates the current flowing along the periphery of the slot 1. Generates resonance with a signal of a 1/4 wavelength frequency band having a wavelength of 4 times the length (D) of the slot (1), and wireless communication is possible by using the signal of the 1/4 wavelength frequency band. Do.

Since the signal resonates through the case of the mobile terminal, the dielectric constant varies according to the material of the case, and the wavelength of the resonance frequency is based on the guided wavelength. Intra-tube wavelength refers to the electromagnetic wavelength in the dielectric, and can be obtained by the ratio of the wavelength/dielectric constant in the air. Since the dielectric constant of the case is larger than that of air, the wavelength inside the tube appears smaller than the wavelength in air.

In order to transmit/receive a signal in a 1/4 wavelength frequency band having a wavelength corresponding to 4 times the length of the slot, impedance matching may be performed so that the maximum impedance appears at the open end 1b of the slot 1.

The impedance of the feeder 2 connected to the feeder 3 is set to a predetermined value (for example, 50 Ω) and the position D1 at which the feeder 2 is connected to the slot 1 is adjusted to Impedance matching can be performed by adjusting the maximum impedance value in 1b).

Impedance matching is performed, and the transmission/reception rate of a frequency band signal having a wavelength corresponding to about 4 times the slot length is rapidly improved compared to other frequency bands and resonates.

Figure 3(b) shows the impedance and impedance when radiating radio waves in a frequency band other than a frequency corresponding to four times the slot length (a frequency band corresponding to twice the slot length, hereinafter referred to as a half-wavelength frequency band). It shows the flow of current. Here, the length of the slot 1 may have a length corresponding to approximately λ/2 of the center frequency wavelength of the 1/2 wavelength frequency band. That is, the wavelength of the 1/2 wavelength frequency band is a high band whose wavelength is shorter than that of the 1/4 wavelength frequency band, and the 1/4 wavelength frequency band is a low band with a relatively long wavelength.

Since the λ/4 wavelength point of the 1/2 wavelength frequency band is located in the center portion 1c, not the end 1b of the slot 1, the maximum impedance value is formed in the middle portion 1c of the slot 1. . Therefore, the portion where the feeders 211, 212, and 215 are located has an impedance of about 300 Ω and is not matched with the impedance (50 Ω) of the feeders 211, 212, and 215, so that there is a problem that the antenna reception rate of the high frequency band is lowered. .

Due to this property, the slot antenna has been mainly used when processing a radio signal of one frequency band, and it is difficult to process a radio signal of a plurality of frequency bands.

However, mobile communication services are provided using the frequency bands of 800MHz, 900MHz, 1.8GHz, 2.1GHz, and 2.6GHz, and since there are slight differences by carriers and different frequency bands are used by country, signals of various frequency bands There is a demand for an antenna that can handle the slot, so it was unpretentious to apply a slot antenna.

4 is a conceptual diagram showing a schematic configuration of an antenna of the mobile terminal 100 related to the present invention, and a slot opened to the left and a slot opened to the right are located on the left and right, respectively. The slot antenna of the present invention comprises two slots 1056 and 1057 for transmitting/receiving by dividing a signal of a low band and a signal of a mid band so as to be used in various frequency bands.

4, a metal plate 1051, a first conductive strip 1052, a second conductive strip 1053, a connection part 1054, a first feeder 1065, a second feeder 1066, a first stub ( 1061 and a second stub 1062 are shown.

The antenna of the present invention includes a first antenna 116 and a metal plate 1051 including a first slot 1056 formed by a metal plate 1051, a connection part 1054 and a first conductive strip 1052, and a connection part. It is composed of a second antenna (117) including a second slot (1057) formed surrounded by (1054) and a second conductive strip (1053).

The first slot 1056 and the second slot 1057 are each open toward opposite directions, so that the radiation direction is different to receive less interference from each other, and can be used for wireless communication of different frequencies by forming different lengths. . A long first slot 1056 emits a signal of a low band, and a second slot 1057 with a short length emits a signal of a mid frequency band.

Since the size of the mobile terminal 100 is limited, the size of the conductive strip 1052 is also limited. Therefore, since the length of the first slot 1056 formed by the metal plate 1051, the connection part 1054 and the first conductive strip 1052 is limited, the frequency and resonance to be radiated through the first slot 1056 It may further include a first stub 1061 extending the first slot 1056 to achieve a.

Like the first slot 1056, the second slot 1057 for emitting a signal in the high frequency band may also have a second stub 1062 to sufficiently secure the length of the slot of the slot antenna resonating in the high frequency band. .

As the first stub 1061 and the second stub 1063 are added, the first antenna 116 and the second antenna 117 are a slot antenna and a planar inverted-F antenna (PIFA). You can have all of your personality.

The first conductive strip 1052 and the first stub 1061 are electrically connected even if they are not formed as a single member, thus constituting a first radiator that emits a low band signal, and the first stub 1061 is connected to each other. 2 The conductive strip 1053 and the second stub 1062 constitute a second radiator that emits a signal of a mid frequency band (Mid bnad).

Hereinafter, it will be described with reference to specific embodiments of FIGS. 5 to 8. 5 is a perspective view showing an example of a state in which the middle frame 105 and the substrate of the mobile terminal 100 related to the present invention are coupled, and the metal plate 1051 of the present embodiment is on the rear surface of the display unit 151 The first frame of the middle frame 105 that is positioned to support the components mounted on the display unit 151 and the mobile terminal 100 may be used. In addition to the middle frame 105, when a case made of a metal material is applied, the case may be a metal plate 1051.

The first conductive strip 1052 and the second conductive strip 1053 of the present embodiment are integrally formed in the middle frame 105. That is, apart from one end of the metal plate 1051 made of a metal material, the first conductive strip 1052 and the second conductive strip 1053 are connected and disposed in parallel, and the metal plate 1051 and the first conductive strip 1052 and It includes a connection portion 1054 connecting the second conductive strip 1053.

When the first conductive strip 1052 and the second conductive strip 1053 are connected to the metal plate 1051 only through the connection part 1054, the connection part 1054 may be disconnected. To prevent this, when the middle frame 105 is formed, the first slot 1056 and the second slot 1057 may be filled with an injection product.

Since the molded product is made of a non-conductive material, it is possible to prevent the first conductive strip 1052 and the second conductive strip 1053 from being separated from the metal plate 1051 while maintaining the function of the slot antenna.

The main substrate 185 is mounted on the rear surface of the middle frame 105. As described above, the main substrate 185 includes a first main substrate 185a positioned above the mobile terminal 100 and a second main substrate 185b positioned below the battery 191, based on the location where the battery 191 is mounted. And a connection substrate 185c positioned between the first main substrate 185a and the second main substrate 185b, and FIG. 5 illustrates a second main substrate 185b positioned below.

The second main substrate 185b may be connected to a power supply unit through the feeders 1065 and 1066 to receive power, and may radiate a signal by passing a current through the antenna. The first feeder 1065 that supplies power to the first slot 1056 connects the second main substrate 185b and the first conductive strip 1052 and supplies power to the second slot 1057. The supplied second feeder 1066 connects the second main substrate 185b and the second conductive strip 1053.

The length of the feeders 1065 and 1066 is adjusted to adjust the impedance of the supplied power, and the position connected to the conductive strip is adjusted to radiate through the first slot 1056 and the second slot 1057. It can match the signal. For impedance matching, the feeders 1065 and 1066 may further include capacitors. The feeders 1065 and 1066 may be disposed beyond the USB port 161 or the ear jack 162 as shown in FIG. 5 to secure a predetermined length.

An interface such as an ear jack 162 or a USB port 161 and a speaker may be positioned under the mobile terminal 100. The ear jack 162 or the USB port 161 may be connected to the second main board 185b to transmit and receive signals.

The ear jack 162 includes a hole into which an earphone plug for transmitting an audio signal is inserted so that sound can be output through an audio device such as an earphone or a headphone. The ear jack 162 may be positioned above or below the mobile terminal 100, and in this embodiment, it is shown positioned below.

The USB port 161 is connected to an external terminal such as a computer to transmit/receive data by wire, or to receive power by being connected to an external power source. A hole is formed in the USB port 161 and the ear jack 162 to connect to an external device, and a hole is formed through a side surface of the main body. Accordingly, the portion where the ear jack 162 or the USB port 161 is located is difficult to locate a continuous member and is a path through which power flows or signals travel, and thus affects the surrounding electromagnetic field.

Therefore, the antenna located under the mobile terminal 100 is generally located to the side of the antenna except for the location where the USB port 161 or the ear jack 162 is formed. An antenna in the form of a pattern that is bent multiple times, such as a PIFA Planar Inverted F Antenna, is bent and disposed in a narrow space on the left and right avoiding the USB port 161 or the ear jack 162.

On the other hand, as described above, since the slot antenna is less affected by the surroundings unlike other antennas, it can be disposed adjacent to the ear jack 162 and the USB port 161. As shown in FIG. 5, the middle frame ( An ear jack 162 and a USB port 161 may be mounted on the rear surface of 105).

In addition, a boss into which a screw is inserted may be formed on the first conductive strip 1052 and the second conductive strip 1053 when fastened to the case of the mobile terminal 100. If it is formed on the metal plate 1051 of the middle frame 105, there is a problem that the mounting space is limited by the boss, but the utilization of the internal space is reduced by positioning the boss to the outermost side of the mobile terminal 100. You can increase it. For example, by moving the boss to the end, the resonance space of the speaker located at the bottom of the rear can be secured.

The stubs 1061 and 1062 coupled to the ends of the first conductive strip 1052 and the second conductive strip 1053 are made of a conductive material and are disposed to be spaced apart from the aforementioned metal frame by a predetermined distance. As shown in FIG. 5, the end portion may be bent in a vertical direction to extend. The stubs 1061 and 1062 may emit a signal having a desired wavelength by substantially extending the length of the slot.

The stubs 1061 and 1062 may be formed on the inner side of the rear case 102 to be connected to the conductive strips 1052 and 1503 when the rear case 102 is coupled. In this case, the shape of the stubs 1061 and 1062 may have a curved surface corresponding to the shape of the rear case 102.

6 is a cross-sectional view of the above-described embodiment, including a metal plate 1051 and a conductive strip on the rear surface of the front case to which the display unit 151 is coupled, and an injection product ( 1055 is injected The middle frame 105 is coupled.

The second main board 185b and the USB port 161 are mounted on the rear surface of the middle frame 105, and the feeder 1065 is positioned between the conductive strip and the second main board 185b to supply power to the conductive strip. , 1066) is shown.

The second main substrate 185b and the battery 191 mounted on the rear surface of the middle frame 105 may be covered, and the rear case may be coupled. In the case of the detachable battery 191, after the rear case is coupled, the battery 191 is seated on the rear surface of the rear case, and the rear cover may be coupled to the rear surface of the rear case.

7 is a plan view showing another example of an antenna of the mobile terminal 100 related to the present invention, in which a conductive strip is not integrally formed with the middle frame 105, but through a strip substrate 188 including a conductive material. Can be implemented.

The strip substrate 188 may be implemented by using a rigid printed circuit board, or a flexible printed circuit board of Yeonseo may be used. In this case, the strip substrate 188 may be partially bent and positioned on the rear surface of the USB port 161 or the ear jack 162.

Even if the strip substrate 188 is connected to a metal member constituting the exterior of the mobile terminal 100, it does not affect the antenna radiation performance, and thus there are few limitations in forming the exterior using the metal member.

FIG. 8 is a perspective view showing another example of an antenna of the mobile terminal 100 related to the present invention, and a slot antenna may be implemented by using metal decks 107a and 107b constituting a part of a case as a conductive strip. A front metal deco constituting a part of the exterior of the front may be used, or metal deco 107a and 107b positioned around the side surfaces as shown in FIG. 8 may be used.

When the metal decor (107a, 107b) constituting a part of the case is used as a conductive strip, the metal decor (107a, 107b) is connected to the metal plate 1051 of the middle frame 105, and the second main substrate (185b) ) And can receive power.

As shown in FIG. 8, in order to secure a space into which the ear jack 162 or the USB port 161, etc. are inserted, the metal deco (107a, 107b) is provided with a first conductive strip (107a) and a second conductive strip (107b). This can be separated. In this case, the first conductive strip 107a and the second conductive strip 107b are respectively electrically connected to the metal plate 1051.

Since the conductive strips 107a and 107b can be extended to the side of the mobile terminal 100, the length of the slot can be sufficiently secured, unlike the above-described embodiment, so that a slot having a sufficient length can be implemented without having a separate stub. I can.

9 is a plan view showing an embodiment of the first antenna 116 of the mobile terminal 100 related to the present invention, FIG. 10 is a view for explaining FIG. 9, and FIG. 11 is a cross-sectional view of FIG. 12 is a graph showing the antenna efficiency of FIG. 9.

The frequency band transmitted and received by the first antenna 116 of the above-described embodiment is a low frequency band (700 MHz to 960 MHz), and the frequency band transmitted and received by the second antenna 117 is a medium frequency band (1.7 GHz to 2.1 GHz). Some countries perform wireless communication using signals of a higher frequency band (2.6 GHz), so a configuration capable of transmitting and receiving signals in the high frequency band is required.

The first feeder 1065 of this embodiment includes a delay line 1065a extending in the first direction. 4 is connected to the first conductive strip 1052 directly from the power supply, but the first feeder 1065 of this embodiment is connected to the first conductive strip 1052 in the above-described embodiment (Fig. 4) is connected to the first conductive strip 1052 at a position that is more inclined in the first direction.

10 is a view for explaining an antenna according to another embodiment of the present invention. As described in FIGS. 3A and 3B, there is a problem in that it is difficult to transmit a signal of a high frequency band with a slot antenna having a length corresponding to the wavelength of the low frequency band.

The first feeder 1065 of the present invention extends to the position of the first conductive strip 1052 that is impedance matched to the low frequency band so that the resonance effect can be exhibited in the high frequency band as well as the low frequency band, and then the opening direction of the slot ( A delay line 1065a extending by a distance D2 in the first direction) may be provided. The length of the delay line 1065a may have a length of 1/4 or more of the wavelength of the high-frequency band resonated by the first antenna.

Impedance matching corresponding to the signal in the high frequency band is possible through the delay line 1065a, and transmission/reception of the signal to the first antenna 116 is possible by adjusting the length of the delay line 1065a (from the first antenna 116). Resonant) high frequency band can be changed.

The first antenna 116 of the present embodiment may further include two branch patterns 1063 and 1064 to transmit and receive signals in a high frequency band. 11, one end of the first branch pattern 1063 is connected to the first conductive strip 1052, the other end extends in a plane different from the first conductive strip 1052, and the second branch pattern ( One end of the 1064 is connected to the power supply unit 186 of the main substrate 185 and the other end extends in a plane different from that of the first conductive strip 1052.

The first branch pattern 1063 and the second branch pattern 1064 may be printed or attached to the rear surface of the rear case, and may be kept electrically spaced apart from the first conductive strip 1052 by the rear case 102. One end of the first branch pattern 1063 may be connected to the first conductive strip 1052 by having a screw 1052c penetrating the rear case 102 or a connection terminal formed inside the rear case 102. As shown in FIG. 9, the first branch pattern 1065 may be connected to the first conductive strip 1052 through the same path 1052c as the first stub 1061.

The first branch pattern 1063 and the second branch pattern 1064 can be used to transmit and receive signals in a high frequency band. Can be utilized.

In this case, as shown in FIG. 12, the resonant frequency points may be distributed into two so that a signal of a wide band can be used (2.5GHz ~ 2.7GHz). In order to resonate at two points, the second branch pattern 1064 forms a pattern with a length of 1/4 of the wavelength of the first resonant frequency so as to match the first resonant frequency (2.5 GHz in this embodiment). The first branch pattern 1063 may form a pattern with a length of 1/4 of the wavelength of the second resonance frequency so as to match the second resonance frequency (2.7 GHz in this embodiment). In this case, the lengths of the first branch pattern 1063 and the second branch pattern 1064 may be reversed.

The first feeder 1065 may also extend in the first direction from the power supply unit 186 to have a length equal to or greater than 1/4 of the wavelength of the first resonant frequency for impedance matching with the signal in the high frequency band.

In the embodiment illustrated in FIG. 10, the first branch pattern 1063 extends in a second direction (the right direction in the drawing) opposite to the direction in which the first slot 1056 is opened, and the second branch pattern 1064 Is extended in the first direction (left direction in the drawing) so that the other end of the first branch pattern 1063 and the other end of the second branch pattern 1064 face each other.

The distance a between the other end of the first branch pattern 1063 and the other end of the second branch pattern 1064 may be 5 mm or less. By further providing the two branch patterns 1063 and 1064, the first antenna 116 may resonate in a signal of a high frequency band (2.5 GHz to 2.7 GHz) as shown in FIG. 12.

In addition, as shown in FIGS. 9 and 11, a switch 1871 connected to the first feeder 1065 may be further provided. The switch 1871 may be formed on the main substrate 185, and the first feeder 1065 connected from the power supply 186 is connected to the first conductive strip 1052 through the switch 1871.

The current applied to the first antenna 116 is changed depending on whether the switch 1871 is turned on or off, and is matched with another frequency band. Referring to FIG. 12, two graphs are shown in the low frequency band, and the resonant frequency band of the low frequency band may change depending on whether the switch 1871 is turned on/off.

S21 of FIG. 12 is a graph (S21) showing the degree to which the first antenna 116 and the second antenna 117 affect each other when operating at the same time. As the size increases in the mid-frequency band, the first antenna 116 and the second antenna 117 When the antennas 117 are simultaneously driven, interference is a problem. However, the structure of the first antenna 116 further including the first branch pattern 1063 and the second branch pattern 1064 of the embodiment shown in FIG. 9 has the advantage of being able to use a signal of a high frequency band. In countries that do not use a high-frequency signal because there is a problem that causes interference in the mid-frequency band, which is the resonant frequency band of the antenna 117, the structure is capable of minimizing interference between the first antenna 116 and the second antenna 117. There is a need to improve.

13 is a plan view showing another embodiment of the first antenna 116 of a mobile terminal according to the present invention, FIG. 14 is a cross-sectional view of FIG. 13, and FIG. 15 is a graph showing antenna efficiency of FIG.

In this embodiment, a first feeder 1065 disposed across the first slot 1056 extends in a first direction along the first conductive strip 1052 from near the connection portion 1054. The end of the extended first feeder 1065 is connected to the first conductive strip 1052 (1052c), and as shown in FIG. 14, the switch 1872 is closer to the connection part 1054 than the first feeder 1065. It is connected with the first conductive strip 1052 at a point.

The first conductive strip 1052 and the first feeder 1065 form a loop antenna as shown in FIG. 14. Since the loop antenna has directivity that forms an electromagnetic field in a specific direction, it is less affected by the second antenna 117 and can transmit and receive a stable signal.

In this embodiment, unlike the embodiment of FIG. 9, it is not possible to transmit/receive a signal in a high frequency band, but in an area that does not communicate with a signal in a high frequency band, it is possible to more stably transmit and receive a signal in a low frequency band and a signal in the middle frequency band have.

In this embodiment, the first stub 1061 is connected to the first feeder 1065 to receive power directly to transmit and receive signals.

Referring to FIG. 15, the S21 graph representing the interference between the two antennas 116 and 117 shows a relatively flat curve, so even if the first antenna 116 and the second antenna 117 are simultaneously driven, it is confirmed that the interference is not large. I can.

16 is a plan view showing another embodiment of the first antenna 116 of the mobile terminal 100 related to the present invention, and FIG. 17 is a cross-sectional view of FIG. 16.

The resonant frequency can be changed from a first frequency (for example, 700 MHz) to a second frequency (for example, 900 MHz) or vice versa using the switch 1871 shown in FIG. 9, but only the distance between short-circuit points in the power supply is changed. There is a problem that antenna matching deterioration occurs.

As shown in the graph of the frequency characteristics during impedance matching using the switch 1871 of FIG. 18(a), when the resonant frequency is changed from the second frequency to the first frequency, the frequency characteristics deteriorate. (The higher the negative value of the frequency dB, the better the frequency characteristic)

In this embodiment, when the switch 1873 connected to the first radiator 1052 is operated in order to match signals of other frequency bands in the low frequency band, the resonance characteristics are changed, thereby improving performance during frequency switching in the low frequency band. The switch 1083 according to the present embodiment changes the shape of the antenna by changing the connection state of the first feeder 1065 and the first radiator 1052, and when the switch 1083 is OFF, it resonates at the first frequency. , When the switch 1083 is ON, it resonates at the second frequency.

In this embodiment, the first radiator includes a first conductive strip 1052 and may further include a first stub 1061, and the first branch pattern 1063 extends from the first radiator 1052. . As described above, the first branch pattern 1063 is coupled together with a delay line in a high frequency band to improve frequency characteristics, and at the same time, in this embodiment, the shape of an antenna is modified.

When the switch 1873 is in the OFF state, the first branch pattern 1063 and the first feeder 1065 are not connected, and thus operate as a slot antenna or a PIFA antenna as in the above-described embodiment, It resonates at a frequency (first frequency) of a wavelength corresponding to four times its length. FIG. 19A shows the flow of current when the switch 1873 is in the OFF state, and the current flows along the first radiator 1052 at the connection part (ground point).

When the switch 1873 is turned on, the first branch pattern 1063 and the first feeder 1065 are connected. When the first feeder 1065 includes a delay line, the delay line and the first branch pattern 1063 are connected as shown in FIG. 16. FIG. 19B shows the flow of current when the switch 1873 is in the ON state, and the first conductive strip and the first branch pattern 1063, the switch 1873, and the delay line are connected at the connection part (contact point). It forms a loop structure that is connected to the feeder through.

The frequency of the wavelength twice the length of the loop becomes the resonant frequency (second frequency). That is, when the loop is formed by the switch 1873, the length of the PIFA antenna is longer than that of the above-described PIFA antenna, but the loop antenna must be formed with a length of 1/2 of the resonant frequency wavelength. It is done.

FIG. 18B is a graph showing signal strength in a structure in which the delay line 1065a and the first conductive strip 1052 are connected as shown in FIG. 16, and shows high efficiency at both 700MHz and 960MHz. In the embodiment of FIG. 16, the switch 1873 does not change the short-circuit point of the first antenna 116, but changes both the current flow and the aspect of the antenna by changing the length and structure of the antenna. There is a matching effect.

20 is a modified embodiment of FIG. 16, wherein the switch 1874 selectively connects the first radiator 1052 and the third radiator 1011. When the first radiator 1052 and the third radiator 1011 are spaced apart and disposed at different positions so that the first radiator 1052 does not function properly, the switch 1874 is connected to the third radiator 1011 and the first radiator. By connecting the feeder 1065, wireless communication may be performed using the third radiating body 1011.

For example, when the first radiator 1052 and the second radiator are exposed on the side of the mobile terminal 100 and the third radiator 1011 is a conductor exposed in front of the mobile terminal 100, the user moves. When the terminal 100 is held by hand, the first radiator 1052 and the second radiator 1053 exposed to the side are touched, and the flow of current flowing through the antenna is changed, resulting in a problem of deteriorating call quality. . When the user's hand touches the first radiator 1052 and the second radiator 1053 and the call quality deteriorates, the radiator of the antenna may be changed by connecting to the third radiator 1011 in front of the switch 1874.

In this case, an additional switch may be further included to selectively connect between the first radiator 1052 and the first feeder 1065. When the switch (1874) is turned on and the third radiator (1011) and the first feeder (1065) are connected, the additional switch is turned off to establish a connection between the first radiator (1052) and the first feeder (1065). When disconnected, current does not flow through the first radiator 1052, and power consumption can be reduced.

21 is a plan view showing an embodiment of the second antenna 117 of the mobile terminal 100 related to the present invention, and FIG. 22 is a graph showing antenna efficiency of FIG. 21.

The second antenna 117 is shorter in length than the first antenna 116 and can be used to transmit and receive signals around 2000 Hz. In the case of transmitting/receiving signals only with the second slot 1057, only one optimum point (1.9 GHz) in the graph shown in FIG. 22 is present, so that the frequency band located below the horizontal dotted line (effective signal strength) is narrow. In order to be used in various communication methods, it is necessary to widen the frequency band that the second antenna 117 can use.

The third branch pattern 1068 has one end connected to the second conductive strip 1053 of the second antenna 117 and extends apart from the second conductive strip 1053 and the metal frame by a predetermined distance. The third branch pattern 1068 may be formed on the rear surface of the rear case, and one end of the third branch pattern 1068 is located inside the rear case 102 through an opening formed in the rear case, and the second conductive strip ( 1053).

Next, the fourth branch pattern 1069 has one end connected to the main substrate 185 located adjacent to the second antenna 117 to receive power from the power supply unit through the main substrate 185. The second conductive strip 1053 is spaced apart from each other by a predetermined distance, and the fourth branch pattern 1069 may also be formed on the rear surface of the rear case 102.

The third branch pattern 1068 and the fourth branch pattern 1069 may have a length of 1/4 of the wavelength of the frequency band for resonance in order to change the band range of the middle frequency band. The third branch pattern 1068 may be formed to have a length of 1/4 of the wavelength of the first resonant frequency (1.7 GHz in this embodiment), and the fourth branch pattern 1069 is the second resonant frequency. In the example, it can be formed with a length of 1/4 of the wavelength of 2.1 GHz).

In this embodiment, the second feeder 1066 extending from the main substrate 185 is not directly connected to the second conductive strip 1053, but when a current flows through the fourth branch pattern 1069, a magnetic field is formed 2 Can transmit and receive signals through antennas.

When the third branch pattern 1068 and the fourth branch pattern 1069 are added, as shown in FIG. 16, the band of the mid-frequency band is widened, so that all signals in the range of 1700 MHz to 2100 MHz can be used.

As described above, according to at least one embodiment of the present invention, it is possible to minimize interference of an antenna due to a metal part provided in the mobile terminal 100, thereby improving antenna performance.

In addition, since a metal material can be used outside, the design quality can be improved due to less design restrictions, and the antenna space is not limited by the external terminal connector 1054 such as the ear jack 162 or the USB port 161. Therefore, the degree of freedom in the arrangement of internal parts can be improved.

The above detailed description should not be construed as limiting in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

100: mobile terminal 105: middle frame
116: first antenna 117: second antenna
1051: metal plate 1052: first conductive strip
1053: second conductive strip 1054: connection
1055: ejection product 1056: first slot
1057: second slot 1061, 1062: stub
1065, 1066: feeder 110: wireless communication department
120: input unit 140: sensing unit
150: output unit 160: interface unit
161: USB port 162: Ear jack
170: memory 180: control unit
185: main substrate 185a: first main substrate
185b: second main substrate 185c: connecting substrate
190: power supply

Claims (18)

main body;
A plate-shaped metal plate mounted on the main body;
A first radiator having one end coupled to the metal plate through a connection part, and extending in a first direction apart from the metal plate from the connection part;
A first feeder connected to the first radiator to supply power;
An auxiliary radiator at one end including a first branch pattern connected to the first radiator; And
And a first switch for turning ON/OFF the connection between the auxiliary radiator and the first feeder,
When the first switch is ON,
The first radiator, the connection part, the first feeder, the first branch pattern, and the first feeder form a loop so that a current flows along the loop,
Wherein the loop resonates with a signal corresponding to a second frequency having a wavelength twice the length of the loop. delete The method of claim 1,
The first switch is
A mobile terminal, wherein a position connected to the first branch pattern is variable. The method of claim 1,
When the first switch is OFF,
The mobile terminal, characterized in that the mobile terminal resonates with a signal corresponding to a first frequency having a wavelength of four times the length of the connector and the first feeder. delete The method of claim 1,
One end further includes a second branch pattern connected to the first feeder and extending in a first direction,
Wherein the first branch pattern extends in a second direction opposite to the first direction so that the other end faces and is adjacent to the other end of the second branch pattern. The method of claim 6,
The first radiator,
Resonates with a third frequency having a wavelength of four times the length of the first branch pattern, or
A mobile terminal, characterized in that the mobile terminal resonates with a fourth frequency having a wavelength of four times the length of the second branch pattern. The method of claim 1,
The auxiliary radiator is
And a third radiator disposed at a different position from the first radiator and spaced apart from the metal plate and connected to the metal plate at one end,
And a controller configured to turn on the first switch to be connected to the third radiator when the transmission/reception efficiency of the signal through the first radiator is less than or equal to a reference value. The method of claim 8,
Further comprising a second switch for turning ON / OFF the connection of the first feeder and the first radiator,
The control unit,
When the first switch is turned off, the second switch is turned on,
When the first switch is turned on, the second switch is turned off. The method of claim 8,
The first radiator is a side metal case disposed on a side surface of the main body,
The third radiator is disposed on the front or inside of the main body,
The control unit,
When a user contacts the side metal case, the first switch is turned on. The method of claim 1,
A second radiator having one end coupled to the connecting part and extending in a direction opposite to the first radiator; And
Further comprising a second feeder supplying power to the second radiator,
The mobile terminal, characterized in that the length of the second radiator is shorter than the length of the first radiator. delete The method of claim 1,
The first feeder
A power line connected to the power source;
A delay line extending in the same direction as the first radiator; And
Mobile terminal, characterized in that it further comprises a supply line connected to the first radiator. The method of claim 13,
The first switch is a mobile terminal, characterized in that connected to the delay line. The method of claim 13,
The first radiator is
A mobile terminal, characterized in that it resonates with a third frequency having a wavelength of four times the length of the delay line. delete delete delete

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