KR101379136B1 - Tunable antenna and portable terminal using the same - Google Patents

Abstract

The present invention relates to a tunable antenna capable of adjusting a transmission / reception band of an antenna and a portable terminal using the same.

A tunable antenna according to the present invention includes a first radiating part, a second radiating part arranged to be spaced apart from the first radiating part, a feeding part applying a signal current to the first radiating part, and the first room. And a switch connected between the dead part and the second radiating part and opened and closed by a magnetic field, and a switching control part arranged to be spaced apart from the switch and controlling an on or off operation of the switch by applying a magnetic field to the switch.

Handheld, antenna, broadband, tunable, tunnable

Description

Tunable antenna and portable terminal using same {TUNABLE ANTENNA AND PORTABLE TERMINAL USING THE SAME}

The present invention relates to an antenna of a portable terminal, and more particularly, to a tunable antenna capable of adjusting a transmission / reception band of an antenna and a portable terminal using the same.

The portable terminal for mobile communication has been lightweight and slim to allow the user to easily carry it, while the antenna mounted on the portable terminal requires a constant communication quality even in a small and limited device.

However, the importance of the design of such a portable terminal has been raised so as to satisfy the aesthetic desires of the consumers as well as the importance of the excellent function.

The antenna used in such a portable terminal has been developed as an external antenna protruding from the outside, but it has a disadvantage that it can hinder aesthetic appearance and be damaged by an external impact.

Therefore, in order to meet the aesthetic desire of the consumer who requires a slim design of the portable terminal and to prevent the antenna from being damaged due to an external impact, an internal antenna, which can be built in the portable terminal, Are being developed. The built-in antenna is also called an intenna.

Such built-in antennas not only have to be efficient in order to be suitable for the structure of a small electronic device but also how to reduce the size thereof is very important issue.

Planar Inverted-F Antenna (PIFA), a rectangular planar inverted-F antenna (PIFA) with a reduced radiation current path can be built inside electronic equipment, so that a sophisticated design can be designed have. Further, since the antenna is protected inside the case of the electronic device, it has an advantage that it is safe from external impact.

However, since the planar inverted-F antenna has to maintain a radiation efficiency higher than a certain level, miniaturization of the antenna is limited. In addition, the planar antenna has a limitation in improving the bandwidth because it is difficult to generate multiple resonances, and it is difficult to have characteristics of multiple bands.

In recent years, development of antennas capable of simultaneously receiving and transmitting low-frequency and high-frequency bands has been progressing actively. However, due to the coupling phenomena between the low-frequency and high-frequency bands, It is difficult to design a multi-band antenna.

In addition, when the current supplied to the antenna flows to the substrate to radiate electromagnetic waves, when the user holds the portable terminal by hand, the so-called hand effect phenomenon occurs, which not only wastes transmission power but also deteriorates reception sensitivity. In order to reduce this hand effect phenomenon, research is being conducted from various angles.

In order to prevent such multi-band implementation and hand effect phenomenon, it is required to have an antenna having a wide band characteristic. However, in order to realize the wideband characteristic, a space for installing an antenna inside the portable terminal must be secured, which increases the size of the portable terminal.

The present invention is to solve the above problems, to provide an antenna that can be mounted inside the portable terminal can support a broadband in a narrow space.

In addition, the present invention is to provide an antenna capable of supporting multiple bands by changing the physical / electrical length of the antenna.

A tunable antenna according to an embodiment of the present invention for realizing the above object, the first radiating portion, the second radiating portion arranged to be spaced apart from the first radiating portion, and applying a signal current to the first radiating portion A switch connected between the power supply unit, the first radiating unit and the second radiating unit and opened and closed by a magnetic field, and arranged to be spaced apart from the switch and controlling an on or off operation of the switch by applying a magnetic field to the switch. It includes a switching control unit.

Accordingly, the tunable antenna not only can handle radio waves of two different bands by changing the physical length of the radiator according to whether the first radiating part and the second radiating part are connected, but also the two different bands. In the case where the frequency bands are formed adjacent to each other, the radio waves for a wide range of bands can be processed, and as a result, broadband can be supported.

In addition, the switching control unit may be formed of an electromagnet or a permanent magnet, it is preferable that the switch is arranged spaced apart from the switch by a predetermined distance below the vertical.

Accordingly, the tunable antenna may turn on / off the switch by a magnetic field formed by the switching controller.

In addition, the portable terminal according to an embodiment of the present invention for realizing the above object, the first radiating portion, the second radiating portion arranged to be spaced apart from the first radiating portion, and the signal current to the first radiating portion An on-off operation of the switch by applying a feeding part, a switch connected between the first radiating part and the second radiating part and opened and closed by a magnetic field, and spaced apart from the switch and applying a magnetic field to the switch It includes a switching control unit for controlling, and a signal processing unit for supplying the signal current to the power supply unit.

Accordingly, the portable terminal can not only process radio waves of two different bands by changing the physical length of the radiator according to whether the first radiating unit and the second radiating unit are connected, and the two different bands When formed in adjacent frequency bands, it is possible to process all radio waves for a wide range of bands, and as a result, there is an advantage that can support broadband.

In addition, the switching control unit may be formed of an electromagnet, in which case the portable terminal further comprises a switching power supply for providing a switching current to the coil formed in the electromagnet so that the electromagnet can form a magnetic field for switching. Do.

Further, the switching control unit may be formed of a permanent magnet, in which case the switch is preferably formed to be on or off depending on the distance to the permanent magnet.

According to the tunable antenna and the portable terminal using the same according to the present invention configured as described above, the physical / of the radiating unit by using a switch in which the on (On) / off (Off) operation is controlled by a static magnetic field (Static Magnetic Field) Since the electrical length can be adjusted directly, it is possible to provide excellent tuning performance compared to the method of adjusting the electrical length of the antenna by simply changing the antenna matching and short pin positions. There is an advantage.

Further, according to the tunable antenna and the portable terminal using the same according to the present invention configured as described above, it is possible to process radio waves of two different bands according to whether the first radiator and the second radiator are connected, When two different bands are formed as adjacent frequency bands, all of the radio waves for a wide range of bands can be handled, and as a result, there is an advantage of supporting broadband.

The portable terminal described in the present specification is an apparatus that performs a function of receiving and reproducing radio waves using built-in communication means or transmitting information generated from the portable terminal in a radio wave form, such as a mobile phone, a PDA (Personal Digital Assistants), a digital broadcasting terminal, a navigation, a notebook computer, an electronic notebook, an electronic dictionary, an MP3 player, an MD player, A music player and the like.

Hereinafter, a tunable antenna and a portable terminal using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a tunable antenna according to an embodiment of the present invention. 2 is a side cross-sectional view of a tunable antenna according to an embodiment of the present invention.

1 and 2, a tunable antenna 10 according to an embodiment of the present invention includes a first radiating part 11, a second radiating part 12, a power feeding part 13, and a switch ( 14), and switching control unit 15.

The first radiating part 11 is arranged above the substrate 16 and spaced apart from the substrate 16, and is formed of a conductive material. In FIG. 1, an example in which the first radiator 11 is formed of a rectangular thin film is illustrated. However, the first radiator 11 is partially removed from the rectangular thin film according to a frequency band and polarization characteristics to be used. Slots, slots, one or more strip lines, circular, loop, meander, helical, or combinations thereof.

The second radiating portion 12 is also formed of a conductive material and is arranged above the substrate 16 and spaced apart from the substrate 16 and the first radiating portion 11. In FIG. 1, the second radiator 12 is formed of a rectangular thin film that is smaller than the first radiator 11, but the second radiator 12 has a band and polarization characteristic at a frequency used. Accordingly, a portion of the rectangular thin film is removed to form a slot, or the second radiating part 12 is formed of one or more strip lines, or a circular, looped, meander, or helical shape. ), Or a combination thereof.

The feeder 13 is connected to one side of the first radiator 11, supplies a signal current to the first radiator 11, and also receives a signal current received from the first radiator 11. The signal is provided to a signal processor (not shown) of the portable terminal through the substrate 16.

In addition, a switch 14 is connected between the first radiating part 11 and the second radiating part 12. The switch 14 is turned on / off by an applied external magnetic field. Here, the external magnetic field excludes a magnetic field generated by a current flowing through the first radiating part 11, the second radiating part 12, or the feeding part 13, and the signal flowing inside the feeding part 13. The magnetic field applied from the switching control unit 15 formed separately from the power supply unit 13 so as not to affect the current. For example, as shown in FIG. 1, when the magnetic field is not applied to the switch 14 from the switching controller 15, the switch 14 is kept in an on state so that the first radiating part is turned on. (11) and the second radiating portion 12 are directly connected to each other. On the other hand, as shown in FIG. 2, when the magnetic field is applied to the switch 14 from the switching control unit 15, the switch 14 is turned off to be off with the first radiating unit 11. The second radiating portions 12 are separated from each other.

The switching controller 15 controls the on / off operation of the switch 14 by applying a static magnetic field to the switch 14. A magnetic flux flows through both ends of the switch 14 by the switching controller 15, and an on / off state of the switch 14 may be determined by the influence of the magnetic flux. In addition, the switching control unit 15 is preferably formed adjacent to the switch 14 and arranged below the switch 14, as shown in Figures 1 and 2 so that a magnetic field can be applied. . However, if the switching controller 15 can provide magnetic flux to both ends of the switch 14, the position of the switching controller 15 may be changed in design of the antenna 10. The switching controller 15 may be made of an electromagnet or a permanent magnet wound around a core. When the switching controller 15 is formed of an electromagnet, the magnetic field formed by the switching controller 15 may be controlled by adjusting a current applied to the coil of the electromagnet. In addition, when the switching control unit 15 is made of a permanent magnet is formed to move the position of the permanent magnet through the structural design of the portable terminal, in this case, if the permanent magnet is located close to the switch 14, the switch When the 14 is turned on and the permanent magnet is located far away from the switch 14 by a predetermined distance, the switch 14 may be formed to be off.

In addition, a dielectric layer 17 may be formed between the first radiating part 11 and the second radiating part 12 and the substrate 16. As the dielectric constituting the dielectric layer 17, an air layer may be used, and dielectrics of various materials such as Teflon, epoxy, synthetic resin, ceramic, glass, and the like may be applied. In this case, the first radiating part 11, the second radiating part 12, and the switch 14 may be formed along the surface of the dielectric layer 17 or inside the dielectric layer 17.

As described above, the tunable antenna 10 according to the present invention may transmit and receive signals of different bands by using the first radiator 11 and the second radiator 12.

In detail, when the switch 14 is turned off, the first radiator 11 and the second radiator 12 are separated from each other, and the tunable antenna 10 moves the first radiator 11. It transmits and receives radio waves in a first band (for example, 890 MHz to 960 MHz). In this case, the second radiating part 12 functions as a parasitic element in a state in which the second radiating part 12 is separated from the first radiating part 11.

On the other hand, when the switch 14 is turned on, the first radiator 11 and the second radiator 12 are directly connected to each other, and the tunable antenna 10 is the first radiator 11. And a second band (eg, 814 MHz to 894 MHz) that transmits and receives a radio wave lower than the first band using the second radiator.

Here, the first band (890MHz ~ 960MHz) and the second band (814MHz ~ 894MHz) are just two different frequency bands to illustrate the function of the tunable antenna 10 according to the present invention, The use band of the tunable antenna 10 is not limited.

As described above, since the tunable antenna 10 according to the present invention can directly adjust the physical / electric lengths of the radiators 11 and 12 by using the switch 14, simply matching and shorting the antennas. Compared to the method of adjusting the electrical length of the antenna by changing the position of the short pin, it is possible to secure reliable tuning performance.

In addition, the tunable antenna 10 according to the present invention may process radio waves of two different bands depending on whether the first radiator 11 and the second radiator 12 are connected. Furthermore, when the two bands supported by the tunable antenna 10 are formed as adjacent frequency bands, the tunable antenna 10 may be configured for a wide range of bands occupied by two different bands as described above. All radio waves can be handled, resulting in the support of broadband.

3 is a diagram illustrating a voltage standing wave ratio (VSWR) characteristic of a tunable antenna according to an exemplary embodiment of the present invention. In the diagram, the horizontal axis represents frequency and the vertical axis represents voltage standing wave ratio (VSWR).

Referring to FIG. 3, in the tunable antenna 10 according to the present invention, when the switch 14 is turned off, the first radiator 11 resonates in a first band (for example, 890 MHz to 960 MHz). (31) is generated.

On the other hand, when the switch 14 is turned on, the tunable antenna 10 has the first radiating part 11 and the second radiating part 12 directly connected to each other to form a second band (for example, Resonance 32 is generated at 814 MHz to 894 MHz.

As described above, the tunable antenna 10 may generate resonance in two different bands by turning on or off the switch 14 using a magnetic field applied by the switching controller 15. The bands can be partially overlapped in adjacent frequency domains and can support a wide bandwidth (eg, 814 MHz to 960 MHz) desired by the user.

4 and 5 are perspective views of a portable terminal according to the present invention. Hereinafter, referring to FIGS. 4 and 5, the portable terminal according to the present invention will be described in terms of components according to appearance. Hereinafter, a slider-type portable terminal will be described as an example of various types of portable terminals such as a folder type, a bar type, a swing type, a slider type, etc. for simplicity of explanation. Therefore, the present invention is not limited to the slider type portable terminal, but can be applied to all types of portable terminals including the aforementioned type.

4 is a front perspective view of an example of a mobile terminal according to the present invention;

The portable terminal 100 of the present invention includes a first body 100A and a second body 100B configured to be slidable along at least one direction on the first body 100A.

The state where the first body 100A is disposed in a state of being overlapped with the second body 100B may be referred to as a closed configuration and the first body 100A may be referred to as a second body 100B ) May be referred to as an open configuration.

The portable terminal 100 operates mainly in the standby mode in the closed state, but the standby mode is also released by the operation of the user. In addition, the portable terminal 100 operates mainly in a call mode or the like in an open state, but may be switched to a standby mode by a user's manipulation or a lapse of a predetermined time.

The casing (casing, housing, cover, etc.) constituting the outer appearance of the first body 100A is formed by the first front case 100A-1 and the first rear case 100A-2. Various electronic components are embedded in the space formed by the first front case 100A-1 and the first rear case 100A-2. At least one intermediate case may be additionally disposed between the first front case 100A-1 and the first rear case 100A-2.

The cases may be formed by injecting a 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 module 151, the first sound output module 152-1, the first camera module 121-1, or the first operation unit (not shown) is connected to the first body 100A, specifically, the first front case 100A- 130-1 may be disposed.

The display module 151 includes a liquid crystal display (LCD), organic light emitting diodes (OLED), and the like, which visually represent information.

In addition, the display module 151 is overlapped with the touch pad in a layer structure, so that the display module 151 may operate as a touch screen to enable information input by a user's touch.

The first sound output module 152-1 may be implemented in the form of a receiver or a speaker.

The first camera module 121-1 may be adapted to photograph an image or a moving image of a user.

The first manipulation unit 130-1 receives a command for controlling network content reproduction and driving guidance operations of the present invention.

Like the first body 100A, the case constituting the outer appearance of the second body 100B is formed by the second front case 100B-1 and the second rear case 100B-2.

The second operation unit 130-2 may be disposed on the front face of the second body 100B, specifically, the second front case 100B-1.

The third operating unit 130-3, the microphone module 122, and the interface unit 170 may be disposed on at least one of the first front case 100B-1 and the second rear case 100B-2.

The first to third operating portions 130-1, 130-2, and 130-3 may be collectively referred to as a manipulating portion 130. In a tactile manner, Any way can be employed.

For example, the operation unit 130 may be embodied as a dome switch or a touch pad capable of receiving a command or information by a user's push or touch operation, or may be a wheel, a jog type, a joystick, Or the like.

In terms of functions, the first operation unit 130-1 is for inputting commands such as start, end, and scroll, and the second operation unit 130-2 is for inputting numbers, characters, symbols, will be.

Also, the third operating unit 130-3 may operate as a hot-key for activating a special function in the portable terminal.

The microphone module 122 may be implemented in a form suitable for receiving voice, sound, etc. of the user.

The interface unit 170 is a channel through which the portable terminal 100 related to the present invention can exchange data with an external device. For example, the interface unit 170 may be a wired or wireless connection terminal for connecting to an earphone, a port for short range communication (e.g., an IrDA port, a Bluetooth port, A wireless LAN port, or the like), or power supply terminals for supplying power to each component in the portable terminal 100.

The interface unit 170 may be a card 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 power supply unit 190 for supplying power to the portable terminal 100 is mounted on the second rear case 100B-2.

The power supply unit 190 may be detachably coupled to a rechargeable battery, for example, for charging.

5 is a rear perspective view of the portable terminal of FIG. 4.

Referring to FIG. 5, a second camera module 121-2 may be additionally mounted on the rear surface of the second rear case 100B-2 of the second body 100B. The second camera module 121-2 has a photographing direction substantially opposite to that of the first camera module 121-1 (see FIG. 1), and may have different pixels from the first camera module 121-1 (see FIG. 1).

For example, the first camera module 121-1 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party, and the second camera module 121-2 has a general object It is often desirable to have a high pixel.

A flash 121-3 and a mirror 121-4 may be further disposed adjacent to the second camera module 121-2. The flash 121-3 shines light toward the subject when the subject is photographed by the second camera module 121-2. The mirror 121-4 allows the user to illuminate the user's face or the like when the user intends to take a picture of himself / herself (self-photographing) using the second camera module 121-2.

The second sound output module 152-2 may be additionally disposed in the second rear case 100B-2.

The second sound output module 152-2 may implement a stereo function together with the first sound output module 152-1, and may be used for a call in a speakerphone mode.

In addition, an antenna 111 for receiving a broadcast signal may be disposed at one side of the second rear case 100B-2. The antenna 111 may be provided separately from the tunable antenna 10 arranged inside the portable terminal 100 according to the present invention, and may be installed to be pulled out from the second body 100B and 2.

A part of the slide module 100C that slidably connects the first body 100A and the second body 100B is disposed on the first rear case 100A-2 side of the first body 100A.

The other part of the slide module 100C may be disposed on the second front case 100B-1 side of the second body 100B and may not be exposed to the outside as in this figure.

The second camera module 121-2 and the like are disposed on the second body 100B, the present invention is not limited thereto.

For example, at least two of the configurations 111-1, 121-2 to 121-3, and 152-2 described as being arranged in the second rear case 100B-2, such as the second camera module 121-2, It is also possible that at least one is mounted on the first body 100A, mainly the first rear case 100A-2. In such a case, there is an advantage that the configuration (s) arranged in the first rear case 100A-2 in the closed state is protected by the second body 100B. Furthermore, even if the second camera module 121-2 is not separately provided, the first camera module 121-1 is formed to be rotatable so that shooting can be performed up to the shooting direction of the second camera module 121-2. May be

6 is a block diagram of a portable terminal having a tunable antenna according to an embodiment of the present invention.

As shown in FIG. 6, a portable terminal 200 having a tunable antenna 10 according to an embodiment of the present invention includes a printed circuit board on which a tunable antenna 10 according to the present invention is formed. : PCB) 210, a signal processor 220 for supplying a signal current to the tunable antenna 10, and a switch for providing a switching current to the switching controller 15 provided in the tunable antenna 10. It includes a power supply 230. The printed circuit board 210 is formed by coating a conductive film 211 for forming various circuit patterns on a substrate 16 made of an insulator.

6 shows an example in which the switching controller 15 included in the tunable antenna 10 is formed of an electromagnet in which a coil is wound around an iron core, and both ends of the coil are connected to the switching power supply 230.

Accordingly, when a switching current is supplied from the switching power supply unit 230 to the switching control unit 15, the switching control unit 15 forms a magnetic field to form the first radiating unit 11 and the tunable antenna 10. The switch 14 connected between the second radiating portions 12 is turned on.

On the other hand, when the supply of the switching current from the switching power supply 230 to the switching control unit 15 is stopped, the switching control unit 15 can no longer form a magnetic field, the first of the tunable antenna 10 The switch 14 connected between the radiating part 11 and the second radiating part 12 is turned off.

In addition, the switching controller 15 is connected to the operation units 130-1, 130-2, and 130-3 formed on the first body 100A or the second body 100B, and the user controls the operation unit 130-1. , 130-2, 130-3 may be pressed or touched to determine whether to supply current from the switching power supply 230 to the switching controller 15, and accordingly the on / off operation of the switch 14 This can be controlled.

As described above, according to the present invention, by connecting or disconnecting the second radiating part 12 to the first radiating part 11 of the tunable antenna 200 provided in the portable terminal 200, the entire radiating part 11, It is possible to adjust the physical length of 12, thereby changing the transmission and reception band of the tunable antenna (10).

The switching power supply 230 forms the switching current using a voltage supplied from the battery 190 mounted in the mobile terminal 200. However, when the battery 190 is designed to supply a DC voltage of 4V, for example, the battery 190 substantially supplies an unstable voltage that swings between 3.5V and 4V. As such, when the unstable voltage provided from the battery 190 affects the minute signal current supplied to the feeder 13 of the tunable antenna 10, the unstable voltage may adversely affect the radiation characteristics of the antenna 200. In addition, the noise of the mobile terminal 200 also decreases due to noise.

However, according to the present invention, the switching line 231 through which the switching current is transmitted between the switching power supply 230 and the switching control unit 15, and the power supply unit 13 of the tunable antenna 10 from the signal processing unit 220. Since the signal lines 221 through which signal currents are transmitted are separated from each other, the switching currents do not affect the signal currents supplied to the feeder 13. Accordingly, the tunable antenna 10 can process radio waves of two different bands without being adversely affected by the radiation characteristics from the switching current applied to the switching controller 15.

7 is a block diagram of a portable terminal having a tunable antenna according to another embodiment of the present invention.

In FIG. 7, an example in which the switching controller 15 included in the tunable antenna 10 is formed of a permanent magnet is shown.

As shown in FIG. 7, the portable terminal 300 having a tunable antenna according to another embodiment of the present invention has a first body and a second body 100B of the tunable antenna 10 according to the present invention. A printed circuit board (PCB) 210 having radiators 11, 12, a switch 14, and a feeder 13, and a signal processor 220 for supplying a signal current to the tunable antenna 10 are provided. And a switching controller 15 for controlling the on / off of the switch 14 in the first body 100A.

In particular, as shown in FIG. 7A, the first and second radiating parts 11 and 12, the switch 14, and the power feeding part 13 of the tunable antenna 10 may include the second body 100B. Is formed at the upper end of the upper part, and the switching controller 15 is formed at the lower end of the first body 100A. As such, when the first body 100A is disposed to overlap the second body 100B and is in a closed configuration, the magnetic field formed by the switching controller 15 does not affect the switch 14. In this case, the switch 14 is turned off.

On the other hand, as shown in FIG. 7B, the first body 100A slides along the second body 100B so that the first body 100A is at least a portion of the second body 100B. In the open configuration exposing the switch, the switching controller 15 is positioned vertically below the switch 14. In this case, the switch 14 is turned on due to the influence of the magnetic field formed by the switching controller 15.

As described above, according to another embodiment of the present invention, the tuner is adjusted by moving the position of the switching controller 15 according to the structural specification of the portable terminal 300 to adjust the distance between the switch 14 and the switching controller 15. The second radiating part 12 may be connected to or separated from the first radiating part 11 of the double antenna 10, and thus, the tunable antenna 10 may be adjusted by adjusting the physical lengths of the entire radiating parts 11 and 12. Transmit / receive band can be changed.

In addition, according to the portable terminal 300 illustrated in FIG. 7, the switching power supply unit 230 may be formed as a permanent magnet to control the on / off of the switch 14 without using a separate switching current. Therefore, the on-off control of the switch 14 does not affect the signal current supplied to the power supply unit 13. Accordingly, the tunable antenna 10 can process radio waves of two different bands without being adversely affected by radiation characteristics from the switching current applied to the switching controller 15.

It is to be noted that the technical idea of the present invention has been specifically described in accordance with the above preferred embodiment, but the above-mentioned embodiments are intended to be illustrative and not restrictive. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

1 is a block diagram of a tunable antenna according to an embodiment of the present invention.

2 is a side cross-sectional view of a tunable antenna according to an embodiment of the present invention.

3 is a diagram illustrating a voltage standing wave ratio (VSWR) characteristic of a tunable antenna according to an exemplary embodiment of the present invention.

4 is a front perspective view of an example of a mobile terminal according to the present invention;

5 is a rear perspective view of the portable terminal of FIG. 4.

6 is a block diagram of a portable terminal having a tunable antenna according to an embodiment of the present invention.

7 is a block diagram of a portable terminal having a tunable antenna according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: tunable antenna 11: first radiating part

12: 2nd radiation part 13: power supply part

14: switch 15: switching control unit

16: substrate 17: dielectric block

100: mobile terminal 100A: first body

100B: second body 200: mobile terminal

210: printed circuit board 211: conductive film

220: signal processor 221: signal line

230: switching power supply unit 231: switching line

300: mobile terminal

Claims (8)

A first radiating part; A second radiating part spaced apart from the first radiating part; A power supply unit applying a signal current to the first radiation unit; A switch connected between the first radiating part and the second radiating part to be opened and closed by a magnetic field; And And a switching controller arranged to be spaced apart from the switch and controlling an on or off operation of the switch by applying a magnetic field to the switch. The method of claim 1, The switching control unit is characterized in that the tunable antenna is formed of an electromagnet or a permanent magnet. The method of claim 1, And the first radiator processes radio waves of a first band, and the second radiator processes radio waves of a second band lower than the first band together with the first radiator. The method of claim 1, The switching control unit is a tunable antenna, characterized in that arranged below the switch at a predetermined distance apart from the vertical. A first radiating part; A second radiating part spaced apart from the first radiating part; A power supply unit applying a signal current to the first radiation unit; A switch connected between the first radiating part and the second radiating part to be opened and closed by a magnetic field; A switching controller arranged to be spaced apart from the switch and controlling an on or off operation of the switch by applying a magnetic field to the switch; And And a signal processing unit for supplying the signal current to the power feeding unit. The method of claim 5, The switching control unit is formed of an electromagnet, And a switching power supply unit configured to provide a switching current to a coil formed in the electromagnet so that the electromagnet can form a magnetic field. The method according to claim 6, The switching control unit is formed of a permanent magnet, And the switch is turned on or off depending on the distance from the permanent magnet. The method of claim 7, wherein The switching controller is formed in the first body, The first radiating part, the second radiating part, and the switch are formed on a second body movably connected along one surface of the first body, And a distance between the switching controller and the switch is adjusted as the first body moves along the second body.

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