KR20120128976A

KR20120128976A - Mobile terminal

Info

Publication number: KR20120128976A
Application number: KR1020110046954A
Authority: KR
Inventors: 최태규
Original assignee: 엘지전자 주식회사
Priority date: 2011-05-18
Filing date: 2011-05-18
Publication date: 2012-11-28

Abstract

According to an embodiment of the present invention, a mobile terminal includes a terminal body including a circuit board formed to process a wireless signal, a radiator embedded in the terminal body, and a feed connection part for feeding and connecting the radiator and the circuit board. The power supply connection unit may include a first feeder configured to feed power to transmit and receive a signal corresponding to a first frequency band, and a pattern extending from the first feeder to transmit and receive a signal corresponding to a second frequency band. By including a second feeder coupled to one end, the size of the antenna can be further miniaturized to improve the internal mounting efficiency of the terminal and to reduce material costs.

Description

[0001] MOBILE TERMINAL [0002]

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

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

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

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

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

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

Another object of the present invention is to provide an antenna device for transmitting and receiving a multi-radio signal of a low frequency band in a smaller space and a mobile terminal having the same.

In order to achieve the above object of the present invention, a mobile terminal according to an embodiment of the present invention includes a terminal body including a circuit board 160 formed to process a radio signal, a radiator embedded in the terminal body and A feed connection part for feeding and connecting the radiator and the circuit board 160, wherein the feed connection part corresponds to a first feed part for feeding and receiving a signal corresponding to a first frequency band and a second frequency band; A second feeder is coupled to one end of the pattern extending from the first feeder so as to transmit and receive a signal.

The present invention also provides a terminal body including a circuit board 160 formed to process a radio signal, a radiator embedded in the terminal body, the radiator and the circuit board 160. A power supply connection unit includes a power supply connection unit, and the power connection unit discloses a mobile terminal including a plurality of power supply units configured to transmit and receive radio signals of different bands.

The antenna device according to an embodiment of the present invention includes a feed connection part formed to perform dual resonance and double feed, thereby further minimizing the size of the antenna, thereby improving internal mounting efficiency of the terminal and reducing material costs. In addition, the mobile terminal can be configured to be slimmer and transmit / receive wireless signals in a low frequency broadband.

1 is a front perspective view showing a front view of a mobile terminal according to an embodiment of the present invention.
2 is a rear perspective view of the mobile terminal shown in FIG.
FIG. 3 is an exploded perspective view of FIG. 1; FIG.
FIG. 4 is a rear perspective view of the mobile terminal of FIG. 2 with the rear case removed;
5 to 8 are conceptual diagrams showing embodiments of the antenna device related to the present invention.
9 to 10 are a plan view and a perspective view of a radiator according to a preferred embodiment of the present invention.
11 and 12 are graphs showing voltage standing wave ratios (VSWR) of a mobile terminal.

Hereinafter, a mobile terminal according to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar configurations, and the description is replaced with the first description. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

The mobile terminal described in this specification may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), and navigation. However, the technical idea described herein may be applied to fixed terminals such as digital TVs and desktop computers.

1 is a front perspective view of an example of a mobile terminal 100 according to the present invention.

The disclosed mobile terminal 100 has a bar-shaped terminal body. However, the present invention is not limited thereto, and can be applied to various structures such as a slide type, a folder type, a swing type, and a swivel type in which two or more bodies are relatively movably coupled.

The body includes a case (a casing, a housing, a cover, and the like) which forms an appearance. In this embodiment, the case may be divided into a first case 101 and a second case 102. Various electronic components are embedded in the space formed between the first case 101 and the second case 102. At least one intermediate case may be further disposed between the first case 101 and the second case 102.

The cases may be formed by injecting synthetic resin or may be formed of a metal material, for example, a metal material such as stainless steel (STS) or titanium (Ti).

The display unit 151, the audio output unit 152, the camera 121, the user input units 131 and 132, the microphone 122, and the interface 170 may be disposed in the terminal body, mainly the first case 101. .

The display unit 151 occupies most of the main surface of the first case 101. A sound output unit 151 and a camera 121 are disposed in an area adjacent to one end of both ends of the display unit 151 and a user input unit 131 and a microphone 122 are disposed in an area adjacent to the other end. The user input unit 132 and the interface 170 may be disposed on side surfaces of the first case 101 and the second case 102.

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

The display unit 151 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 (flexible). and at least one of a 3D display.

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

According to an implementation form of the mobile terminal 100, two or more display units 151 may exist. For example, in the mobile terminal 100, a plurality of display portions may be spaced apart from one another, or may be disposed integrally with one another, and may be disposed on different surfaces, respectively.

When the display unit 151 and a sensor for detecting a touch operation (hereinafter, referred to as a touch sensor) form a mutual layer structure (hereinafter referred to as a touch screen), the display unit 151 may be configured in addition to an output device. Can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The interface 170 may be connected to a mobile terminal using a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (eg, a memory card, a SIM / UIM card), or the like. It serves as an interface with the device. The interface 170 receives data from an external device or receives power and transfers the data to each component inside the mobile terminal or transmits data within the mobile terminal to the external device.

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

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

The user input unit is manipulated to receive a command for controlling an operation of the mobile terminal 100 and may include a plurality of manipulation units 131 and 132. The manipulation units 131 and 132 may also be collectively referred to as manipulating portions, and may be employed in any manner as long as the user operates the tactile manner with a tactile feeling.

The contents inputted by the first or second operation unit 131 or 132 may be variously set. For example, the first operation unit 131 receives commands such as start, end, scroll, and the like, and the second operation unit 132 controls the size of the sound output from the sound output unit 152 or the size of the sound output from the display unit 151 To the touch recognition mode of the touch screen.

2 is a rear perspective view of the mobile terminal 100 shown in FIG. 1.

Referring to FIG. 2, a camera 121 ′ may be additionally mounted on the rear surface of the terminal body, that is, the second case 102. The camera 121 ′ has a photographing direction substantially opposite to the camera 121, and may be a camera having different pixels from the camera 121.

For example, the camera 121 may have a low pixel so that the face of the user can be photographed and transmitted to the other party in case of a video call or the like, and the camera 121 ' It is preferable to have a large number of pixels. The cameras 121 and 121 'may be installed in the terminal body so as to be rotatable or pop-up.

A flash and a mirror may be additionally disposed adjacent to the camera 121 '. The flash illuminates the subject when the subject is photographed by the camera 121 '. The mirror 124 allows the user to illuminate the user's own face or the like when the user intends to shoot himself / herself (self-photographing) using the camera 121 '.

The sound output unit may be additionally disposed at the rear of the terminal body. The sound output unit may implement a stereo function together with the sound output unit 152 and may be used to implement a speakerphone mode during a call.

An antenna (not shown) for receiving a broadcast signal may be additionally disposed on the side surface of the terminal body in addition to an antenna for a call or the like. An antenna constituting a part of the broadcast receiving module can be installed to be drawable from the terminal body.

The terminal body is equipped with a power supply for supplying power to the mobile terminal (100). The power supply unit may be built in the terminal body, or may be configured to be directly removable from the outside of the terminal body. The power supply unit may be built in by the battery cover 190.

The second case 102 may additionally be equipped with a touch pad (not shown) for sensing a touch. Like the display unit 151, the touch pad may also be configured to have a light transmissive type. In this case, if the display unit 151 is configured to output visual information from both sides, the visual information can be recognized through the touch pad. Information output on both surfaces may be controlled by the touch pad. Alternatively, a display may be additionally attached to the touch pad, and the touch screen may be disposed on the second case 102.

The touch pad operates in association with the display unit 151 of the first case 101. The touch pad may be disposed parallel to the rear of the display unit 151. The touch pad may have a size equal to or smaller than that of the display unit 151.

FIG. 3 is an exploded perspective view of FIG. 1, and FIG. 4 is a rear perspective view of the mobile terminal of FIG. 2 with the rear case removed.

As shown in FIG. 3, the mobile terminal 100 according to an embodiment of the present invention is a mobile terminal 100 having an antenna device 20, 30, 200, 300 that operates as a monopole, and includes a first case. The display module 153 is mounted on one surface of the 101, and the circuit board 160 is disposed to cover the display module 153.

Various electronic devices may be mounted on one surface of the circuit board 160, and a shield member (not shown) for protecting the electronic devices may be mounted on one surface of the circuit board 160. The shield member may be electrically connected to the circuit board 160 to extend the ground of the circuit board 160.

The circuit board 160 may be configured as an example of a controller for operating various functions of the mobile terminal 100. The circuit board 160 may be provided in plural and may perform a function of the controller by a combination of the circuit boards 160. In addition, the circuit board 160 is electrically connected to the antenna devices 20, 30, 200, and 300, and is configured to process radio signals (or radio electromagnetic waves) transmitted and received by the antenna devices 20, 30, 200, and 300. . For the processing of the wireless signal, a plurality of transmission and reception circuits 224, 225 (see FIG. 10) may be formed or mounted on the circuit board 160.

For example, the first transmission / reception circuit 224 transmits a signal of an S band (1.55 to 3.9 GHz, or 2.5 to 4 GHz band) or an L band (390 MHz to 1.15 GHz, 1 to 2 GHz, or 1.53 to 1.66 GHz) or It may be formed to receive, and the second transmit / receive circuit 225 may be formed to transmit or receive a signal in the VHF band (frequency band of 30-300MHz).

Transceiver circuits 224 and 225 may be formed including one or more integrated circuits and associated electrical elements. In one example, the transceiver circuitry may include a transmit integrated circuit, a receive integrated circuit, a switching circuit, an amplifier, and the like.

The plurality of transceiver circuits 224, 225 can operate simultaneously by simultaneously feeding the radiator. For example, while either one is transmitting, the other can receive, both can transmit or both can receive.

According to the illustration, the battery 191 is disposed as an example of the power supply inside the terminal, the battery 191 is accommodated in the metal seat member forming a seating space. The mounting member may be electrically connected to the circuit board 160 to serve to extend the ground of the circuit board 160. In addition, the seating member, the shield member, and the ground layer of the circuit board 160 may be electrically connected to form a ground of the terminal.

In addition, a part of the antenna devices 20, 30, 200, and 300 may be implemented by being thermally fused to the intermediate case 103 of the terminal body. Hereinafter, although the antenna devices 20, 30, 200, and 300 have been described with reference to being implemented in the intermediate case 103, the present invention is not limited thereto, and the cases may be integrally formed.

The method of thermal fusion to the intermediate case 103 of the terminal body is as follows. When the high frequency generator generates a high frequency electromagnetic field, a part of the metallic radiator among the antenna devices 20, 30, 200, 300 is heated by induction heating. Then, the pressurizing device presses a part of the intermediate case 103 on the object to be fused. Here, the pressurization by the pressurization device may pressurize the above part before heating, during heating, or after heating, but it is preferable to pressurize before the induction heating and maintain the pressurization until it is sufficiently cooled.

Mobile terminal 100 according to an embodiment of the present invention may be provided with a plurality of antenna devices, the antenna 20, 30, 200 operating in a band such as FM radio frequency band, Blue Tooth or WIFI on the top , 300 may be disposed. In the lower portion, an antenna 180 formed to transmit and receive radio signals corresponding to at least one of a personal communication system (PCS), an advanced wireless service (AWS), a digital communications network (DCC), and a long term evolution (LTE) may be disposed. Can be.

In particular, the antenna device (20, 30, 200, 300) related to the present invention is a broadcast signal receiving antenna, Bluetooth antenna, satellite signal reception operating in the band such as the FM radio frequency band, Blue Tooth or WIFI Antenna, and a data receiving antenna of the wireless Internet.

In order to transmit and receive wireless signals in the VHF (Very High Frequency) band, such as FM radio or terrestrial DMB, the wavelength is 1 to 10 m due to its frequency characteristics, making it difficult to implement an antenna in a small terminal. In addition, in the case of a loop antenna or a dipole antenna, the antenna length should be sufficiently long, so that the antenna devices 20, 30, 200, and 300 according to an embodiment of the present invention have a length of only 1/4 wavelength, but VHF (Very High Frequency) A monopole antenna capable of transmitting and receiving radio signals in a band is implemented.

As shown in FIG. 4, the battery 191 is stacked on one surface of the circuit board 160, and the speaker module 133 and the camera module 125 are disposed close to the top of the battery 191. The antennas 180, 20, 30, 200, and 300 are formed close to the top and bottom of the terminal body with the battery 191 interposed therebetween. The antennas 180, 20, 30, 200, and 300 are grounded or feed-connected to the circuit board 160, respectively.

5 to 8 are conceptual views illustrating embodiments of the antenna apparatus 20, 30, 200, 300 according to the present invention.

Antenna device 20, 30, 200, 300 according to an embodiment of the present invention is a power supply connecting portion 22, 32, 220 for feeding and connecting the radiator (21, 31, 210, 310) and the radiator and the circuit board 160 , 320). The feed connection parts 22, 32, 220, and 320 include a plurality of feed parts or feed units, for example, the first feed parts 23, 33, 230, and 330 to operate in two different frequency bands. The second feeding part 24, 34, 240, 340 may be coupled to one end of the pattern extending from the first feeding part.

For example, a path between the radiator and the first feeder may be configured to transmit and receive a radio signal in a 2.4 GHz band, and a path between the radiator and the second feeder may transmit and receive a radio signal in an FM radio frequency band (88 to 108 MHz). It can be made to. The first feeder may be connected to the first transmit / receive circuit 224 and the second feeder may be connected to the second transmit / receive circuit 225.

As shown in FIG. 5, the pattern 25 extended as a conductor extends a path to transmit and receive a radio signal of the FM radio frequency band. However, in this way, when the path is formed by using the conductor, it is difficult to achieve miniaturization of the antenna because the conductor must be formed to have a sufficient length.

Therefore, as shown in FIG. 6, when the radiator 31 is formed in the form of a flat patch, the inductance is smaller and the capacitance is larger than that of the line-shaped radiator 21 illustrated in FIG. 5, but only the reactance component of the impedance is changed. Since the reactance component is constant, the size of the antenna can be reduced by appropriately adjusting the amount of change in inductance and capacitance while maintaining the resonance frequency.

The related expression is as follows.

Z = R + jX = R + jwL + jwC

Here, since the resonance frequency is the frequency at which reactance is 0, when X = wL-1 / wC = 0,

f = 1 / (2 * phi * sqrt (LC))

In addition, the extended patterns 35, 250, 350, and 370 may include at least one inductor such that the radiator 31, the extended pattern, and the second feeder form a path of the FM radio frequency band. . That is, by reducing the inductance component of the antenna and adding the inductors 36, 260, 360, and 371 to the power supply circuit, the size of the antenna can be further reduced by replacing the inductance component of the radiator.

In addition, when the first feeders 33, 230, and 330 are connected to intermediate portions of the extended patterns 25, 35, 250, and 350, dual resonance characteristics resonating in different bands may be obtained.

When double feeding (or simultaneous feeding) is performed through the first feeders 33, 230, 330 and the second feeders 34, 240, 340, interference occurs due to different frequency bands. To reduce such interference, the first feed part and the second feed part may include signal trap circuits 231 and 331 as shown in FIG. 7.

As shown in FIG. 8, the antenna device 300 may include another extension pattern 370 and a third feed part 380. Accordingly, triple feeding may be performed through the first to third feeding units 330, 340, and 380, and the size of the antenna 300 may be further reduced. Herein, although the extension pattern includes an inductor as an example, the extension pattern may be formed of only the pattern, and may include other tuning elements such as a stub or a slot, if necessary.

As such, since multiple antennas operating in a plurality of frequency bands can be formed to have only one radiator, the antenna and the terminal can be miniaturized.

9 to 10 are a plan view and a perspective view of a radiator 210 according to a preferred embodiment of the present invention.

The radiator 210 may be formed of a plurality of members. As shown in FIG. 9, for example, the radiator 210 may include a first member 211 and a second member 212 such that gaps spaced from each other form a slot 214. By including such a slot 214, the antenna can exhibit the operating characteristics as a slot antenna as well as the operating characteristics as a monopole antenna. By properly tuning the slot 214 and the plurality of members, the radiator 210 can make a double resonance. Slot 214 is also filled with air, but can be filled with any suitable dielectric.

The first member 211 and the second member 212 may be formed in a planar patch form by being disposed on the same plane, either one of the first member 211 or the second member 212. Can be connected to the feed connection.

Any one of the first member 211 or the second member 212 may include at least one stub 213 to expand the bandwidth. This stub allows tuning of the antenna.

The feed connection unit 220 feeds the first member 211 or the second member 212 by an electrical connection (or an electro-magnetic feeding method). In addition, the antenna may be electrically connected to the first member 211 or the second member 212 to be electrically shorted to achieve antenna resonance frequency and impedance matching.

The power supply connection unit electrically connects the power supply device (not shown) and the first member 211 or the second member 212. For this connection, the feed connection unit may include at least one of the feed plate 222, the feed arm 221, or the feed line 164. Here, the feed plate 222, the feed arm 221 or the feed line may be electrically connected to each other, and transmits the current (or voltage) fed through the feed device to the conductor of the radiator. Here, the feed line may include a microstrip printed on a substrate.

As shown in FIG. 10, the feed plate 222 is formed on the circuit board 160, and the feed arm 221 connects the first member 211 or the second member 212 and the feed plate 222 to each other. In order to be connected, the radiator 210 may be formed to be bent in a vertical direction in one plane of the radiator 210. In addition, the feed plate 222, the first transmit / receive circuit 224, and the second transmit / receive circuit 225 may be connected by a feed line. A predetermined pattern may be formed between the feed plate 222 and the transmission / reception circuit, or an inductor may be included as part of the pattern.

11 and 12 are graphs showing voltage standing wave ratios (VSWRs) of mobile terminals.

11 and 12, it can be seen that antennas according to an embodiment of the present invention exhibit satisfactory broadband antenna characteristics in bands in which the center frequency is several tens of octaves or more apart. As described above, the antenna according to an embodiment of the present invention may implement a wideband characteristic in a high frequency band such as a 2.4 GHz band as well as a low frequency band such as an FM radio frequency band (88 to 108 MHz).

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

Claims

A terminal body comprising a circuit board formed to process a wireless signal;
A radiator embedded in the terminal body; And
A feed connection part for feeding and connecting the radiator and the circuit board;
The feed connection unit includes a first feeder configured to feed power to transmit and receive a signal corresponding to a first frequency band, and one end of a pattern extending from the first feeder to transmit and receive a signal corresponding to a second frequency band. And a second feeder coupled to the mobile terminal.

The method of claim 1,
The radiator is a mobile terminal, characterized in that formed in the form of a planar patch (Planar Patch).

The method of claim 1,
The radiator may include a first member having one end coupled with the feed connection portion; And
And a second member connected to the first member and having at least one slot formed therebetween so as to allow double resonance.

The method of claim 3,
And the first member and the second member are formed on the same plane.

5. The method of claim 4,
And the first member or the second member includes at least one stub to expand the bandwidth.

The method of claim 1,
The second frequency band is a mobile high frequency (VHF) band, characterized in that the mobile terminal.

The method according to claim 6,
The first frequency band is a mobile terminal, characterized in that the S band or L band.

The method of claim 1,
The circuit board includes a first transceiver circuit and a second transceiver circuit,
The circuit board is a mobile terminal, characterized in that formed through the radiator to transmit and receive wireless signals of different bands at the same time.

9. The method of claim 8,
The first feed portion and the second feed portion reduce interference between respective frequencies when simultaneously feeding the radiator,
And the first feed part and the second feed part each include a signal trap circuit.

The method of claim 1,
And the extended pattern comprises at least one inductor to operate in the second frequency band.

The method of claim 1,
The terminal body includes:
A first case and a second case forming an appearance of the terminal,
And the radiator is heat-sealed to an intermediate case formed between the first and second cases.

A terminal body comprising a circuit board formed to process a wireless signal;
A radiator embedded in the terminal body; And
A feed connection part for feeding and connecting the radiator and the circuit board;
The power supply connection unit includes a plurality of power supply units formed to allow the radiator to transmit and receive radio signals of different bands.

The method of claim 12,
The power supply units can simultaneously transmit and receive signals of a plurality of frequency bands,
A mobile terminal, characterized in that the other power supply unit is formed at one end of the pattern extending from any one power supply unit.

The method of claim 12,
And the elongated pattern comprises at least one inductor.

The method of claim 12,
The power feeding units include elongated patterns forming a path to resonate in each frequency band,
The circuit board includes a plurality of transmission and reception circuits formed to enable simultaneous transmission and reception of wireless signals of different bands through the radiator.

16. The method of claim 15,
And the power supply units each include a signal trap circuit so as to reduce interference between respective frequencies when simultaneously feeding the power supply units.

The method of claim 12,
The radiator includes at least one slot, the mobile terminal characterized in that it is formed to allow a plurality of resonances.

19. The method of claim 18,
The radiators are formed of a plurality of members, each member comprises at least one stub (stub) to expand the bandwidth.