KR101745612B1 - Multi-band antenna possible for shifting resonance frequency - Google Patents

Abstract

The present invention relates to a multi-band antenna capable of varying the resonant frequency. A multi-band antenna according to the present invention is a multi-band antenna capable of varying a resonant frequency, comprising: a first grounding portion connected to an end of an antenna; a power feeding portion connected to the first grounding portion for feeding power to the first grounding portion; And a switching unit connected to the power supply unit and the second ground unit, and the resonance frequency is varied by the switching unit.

Description

[0001] The present invention relates to a multi-band antenna capable of varying a resonant frequency,

The present invention relates to a multi-band antenna capable of varying the resonant frequency.

A terminal can be divided into a mobile / portable terminal and a stationary terminal depending on whether the terminal is movable or not. The mobile terminal can be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry the mobile terminal.

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

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

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

On the other hand, as 4G-LTE system is introduced all over the world, limited frequency resources are occupied by each telecommunication service provider, and the frequency band is different for each communication provider.

In particular, LTE Advanced, represented by LTE-A, provides broadband and additional bandwidth to provide faster data communications services, enabling operators to take advantage of the more affordable, It is competing.

However, in a country with a large area, it is difficult for a single operator to service all of the nationwide area through their own base station network. Accordingly, a roaming service is provided between operators through an inter-operator agreement.

In addition, according to the trend that the whole world is integrated into one living zone, it is necessary to provide a roaming service in the form of World Phone.

As a result, it should be considered that all of these various frequency bands can be used in the design and manufacture of mobile communication terminals. Particularly, in recent years, various resonance frequencies have been used in a large number of areas, and a resonance frequency switching technique (hereinafter referred to as a " resonance frequency switching technique ") that can operate by changing the resonance frequency of an antenna according to a region where a mobile terminal is used, .

However, since the space for designing the antenna is continuously reduced for miniaturization, it is not easy to design the antenna to cover the wide frequency range.

Hereinafter, a conventional inverted-F type antenna will be described with reference to FIGS. 1 to 3. FIG.

1 is a diagram showing a basic structure and a current distribution graph of a conventional inverted F-type antenna. FIG. 2 is a diagram in which a switching unit is disposed in a feeding part of the inverted-F antenna of FIG. 1; FIG. FIG. 3 is a diagram in which a switching unit is arranged in a first ground unit of the inverted-F antenna of FIG. 1; FIG.

First, referring to FIG. 1, a conventional inverted F-type antenna is shown.

The inverse F-type antenna shown in FIG. 1 is mainly used in a miniaturized device such as a mobile terminal. The first F-type grounding part G1 ', the second F-type grounding part G2' It can be seen that no other switching part is disposed in the whole area P.

Referring to the graph of current (I) - antenna length (resonance length) L shown in the upper part of FIG. 1, at the starting point of the antenna with high current value (position of first ground G1 ' (Resonance length lambda / 4), the length from the start point to the open portion B near the open end G2 'is the length of the antenna (resonance length lambda / 4) (A) of the current is generated in the portion (B) where the current flows.

For reference, a high-band current path is formed between the feeding part P and the antenna end AE, and a low-frequency current path is formed between the first grounding part G1 'and the second grounding part G2' A low-band current path may be formed, and the current distribution shown in FIG. 1 is a current distribution that is examined based on the low-frequency current path.

There is a method of applying an inductor to reduce the resonance length in such an inverted F-type antenna. When the inductor is applied, the resonance length is reduced, and the antenna can be installed in a narrow space inside the mobile terminal, which is gradually miniaturized.

However, when the inductor is applied, the resonance frequency can be shifted to a lower frequency as the inductor value increases. However, as the volume of the overall current distribution decreases, the radiation performance may deteriorate in inverse proportion to the value of the applied inductor.

2, when the switching unit SW '(including, for example, an inductor and a capacitor) is applied to the power feeding unit P, the switching unit SW' Loss and performance degradation may occur due to a decrease in antenna gain caused by a capacitor and an inductor. That is, when the inductor having a large value to move the resonance frequency at a low frequency is applied to the switching unit SW ', a problem of lowering the antenna gain may occur in a high frequency band.

3, when the switching unit SW 'is applied to the first grounding unit G1', the switching unit SW 'changes the impedance between the inverted F-type antenna and the ground, So that there is a limitation in frequency movement.

According to an aspect of the present invention, there is provided a switching unit including a plurality of impedances selectively activatable in an open part between a feeding part and a second grounding part, that is, Band antenna that can easily reduce the loss due to antenna gain degradation and can prevent deterioration of radiation performance.

Another object of the present invention is to provide a mobile terminal including the above-described multi-band antenna.

According to an aspect of the present invention, there is provided a multi-band antenna having variable resonance frequency, the multi-band antenna comprising: a first ground unit connected to an end of an antenna; 1 grounding part, a second grounding part connected to the feeding part to be fed from the feeding part, and a switching part connected to the feeding part and the second grounding part, and the resonance frequency is varied by the switching part.

The switching unit includes a switching terminal for selectively activating one of the plurality of impedance elements and the plurality of impedance elements.

Wherein the plurality of impedances include a first impedance including a first inductor and a first capacitor connected in series, and a second impedance including a second inductor and a second capacitor connected in series, wherein the first inductor is different from the second inductor Has an inductance value, and the first capacitor has a capacitance value different from that of the second capacitor.

At least one of the first capacitor and the second capacitor includes a plurality of capacitors connected in series.

The resonance frequency is changed to a lower frequency as the inductance value of the inductor included in the impedance element activated by the switching terminal is greater and as the capacitance value of the capacitor included in the impedance element activated by the switching terminal is smaller, .

A switching controller for providing a control signal to the switching unit, and a storage unit for storing information related to the resonant frequency.

The switching unit includes a switching terminal for selectively activating one of the plurality of impedance elements and the plurality of impedance elements, and the switching control unit provides a control signal to the switching terminal.

The information related to the resonance frequency stored in the storage section includes a resonance frequency value when each of the plurality of impedance elements is activated, and the switching control section generates the control signal based on information related to the resonance frequency.

A low-band current path is formed between the first grounding portion and the second grounding portion, and a high-band current path is formed between the power feeding portion and the end of the antenna.

According to another aspect of the present invention, there is provided a mobile terminal including the multi-band antenna.

The multiband antenna and the mobile terminal including the multiband antenna according to the present invention can easily change the resonance frequency, can reduce loss due to antenna gain degradation, and can prevent deterioration of radiation performance, Product stability and reliability can be improved by solving performance degradation problems.

1 is a diagram showing a basic structure and a current distribution graph of a conventional inverted F-type antenna.
FIG. 2 is a diagram in which a switching unit is disposed in a feeding part of the inverted-F antenna of FIG. 1; FIG.
FIG. 3 is a diagram in which a switching unit is arranged in a first ground unit of the inverted-F antenna of FIG. 1; FIG.
4 is a schematic view illustrating a multi-band antenna according to an embodiment of the present invention.
5 is a schematic view for explaining the switching unit of Fig.
6 is a view for explaining a change in current distribution when a capacitor is applied to the switching unit of FIG.
FIG. 7 is a view for explaining a change in current distribution when the inductor is applied to the switching unit of FIG. 4. FIG.
FIG. 8 is a block diagram illustrating a mobile terminal to which the multi-band antenna of FIG. 4 is applied.

Certain terms are hereby defined for convenience in order to facilitate a better understanding of the present invention. Unless otherwise defined herein, scientific and technical terms used in the present invention shall have the meanings commonly understood by one of ordinary skill in the art. Also, unless the context clearly indicates otherwise, the singular form of the term also includes plural forms thereof, and plural forms of the term should be understood as including its singular form.

Hereinafter, a multi-band antenna according to an embodiment of the present invention will be described with reference to FIGS.

4 is a schematic view illustrating a multi-band antenna according to an embodiment of the present invention. 5 is a schematic view for explaining the switching unit of Fig. 6 is a view for explaining a change in current distribution when a capacitor is applied to the switching unit of FIG. FIG. 7 is a view for explaining a change in current distribution when the inductor is applied to the switching unit of FIG. 4. FIG.

4 and 5, a multi-band antenna 1 according to an embodiment of the present invention has an inverted-F type antenna structure and includes a first ground G1, a feeder P, A ground section G2, and a switching section SW.

The first ground G1 may be connected to the antenna termination AE.

Specifically, the first ground G1 is connected to the antenna terminal AE and the power feeder P, and can receive power from the power feeder P. For reference, a power feed means supplying electricity.

The power feeding part P may be connected to the first grounding part G1 to supply power to the first grounding part G1.

Specifically, the feeding part P may be connected to the first grounding part G1 and the second grounding part G2 to feed the first grounding part G1 and the second grounding part G2. Here, a switching unit SW is disposed between the power feeding unit P and the second grounding unit G2, and the switching unit SW can be disposed in the opened portion B of Fig.

The second ground G2 may be connected to the power feeder P to receive power from the power feeder P. [

Specifically, the second grounding unit G2 is connected to the switching unit SW, and unlike the conventional inverted-F antenna shown in Fig. 1, the switching unit SW is connected to the open part (B in Fig. 1) So that power can be supplied from the power feeding portion P.

The switching unit SW may be connected to the power feeding unit P and the second ground unit G2.

Specifically, the switching unit SW may be disposed between the power feeding unit P and the second grounding unit G2, that is, in the opened portion B in Fig. 1, and by this switching unit SW, The resonance frequency of the band antenna 1 can be varied.

The switching unit SW may include a switching terminal SP for selectively activating one of the plurality of impedance elements Z1 and Z2 and the plurality of impedance elements Z1 and Z2.

The plurality of impedance elements Z1 and Z2 are connected in series between a first inductor L1 and a second inductor L2 connected in series with a first impedance element Z1 including a first capacitor C1 and a second capacitor C2 And a second impedance element Z2 including the second impedance element Z2.

Here, the first inductor L1 has a different inductance value from the second inductor L2, and the first capacitor C1 may have a capacitance value different from that of the second capacitor C2 .

Although the first inductor L1 and the second inductor L2 may have the same inductance value and the first capacitor C1 may have the same capacitance value as the second capacitor C2, The first inductor L1 has an inductance value different from that of the second inductor L2 and the first capacitor C1 has a capacitance value different from that of the second capacitor C2 For example,

For example, the first inductor L1 and the second inductor L2 may each have an inductance value between 22 nH and 150 nH, and the first capacitor C1 and the second capacitor C2 may have an inductance value of 0.2 pF to 1 pF Lt; / RTI >

For reference, when the capacitance value of the first capacitor C1 and the second capacitor C2 is a value between 0.2 pF and 1 pF, it is a very small value. Therefore, the capacitors applied to the plurality of impedance elements Z1 and Z2 for fine capacitance value adjustment (or resolution improvement) can be configured to include a plurality of capacitors connected in series.

Accordingly, although not shown in the drawing, at least one of the first capacitor C1 and the second capacitor C2 may include a plurality of capacitors connected in series.

Based on the structure of the switching unit SW, the resonant frequency of the multi-band antenna 1 changes depending on which impedance element is selected by the switching terminal SP.

For example, when the first impedance element Z1 is selected (that is, activated) by the switching terminal SP and the inductance value of the first inductor L1 included in the first impedance element Z1 is close to 150nH In the case of having a high value (for example, 130 nH), the resonance frequency is changed to a low frequency due to the frequency characteristic of the inductor, and the antenna length, that is, the resonance length is shortened.

The second impedance element Z2 is selected (i.e., activated) by the switching terminal SP and the capacitance value of the second capacitor C2 included in the second impedance element Z2 is set to a low value close to 0.2 pF (For example, 0.4 pF), the resonance frequency is varied to a high frequency due to the frequency characteristic of the capacitor, and the antenna length, i.e., the resonance length becomes long.

That is, the larger the inductance value of the inductor included in the impedance element activated by the switching terminal SP, the more the resonance frequency changes to a lower frequency, and the capacitance value of the capacitor included in the impedance element activated by the switching terminal SP becomes The smaller the resonance frequency, the higher the frequency.

This is because as the inductance value of the inductor becomes larger, a lower resonance frequency is realized and the resonance length becomes shorter. As the capacitance value of the capacitor becomes smaller, a higher resonance frequency is realized and the resonance length becomes longer.

Accordingly, in the case of the multi-band antenna 1 of the present invention, since the conventional open portion (B in FIG. 1) is connected by the switching portion SW, the antenna length becomes about? / 2 longer than? The resonance frequency is changed to a low frequency (low frequency), and the resonance frequency is reduced to a radiation of not more than? / 4 of the resonance length even if the inductance of the inductors of the plurality of impedance elements Z1 and Z2 is large. I am involved. Further, when an impedance having a small capacitance value of the capacitors among the plurality of impedance elements Z1 and Z2 is activated, the resonance frequency is varied to a high frequency (high frequency), and only λ / 4 or more of the resonance length is involved in radiation.

Therefore, even when the multi-band antenna 1 of the present invention includes the switching unit SW, the difference in the radiation performance is small as compared with the prior art that does not include the switching unit.

For reference, the plurality of impedance elements included in the switching unit SW may include three or more, for example, three to n (n is a natural number) impedance elements, 1, the resonance frequency of the first impedance element Z1 and the second impedance element Z2 can be shifted (varied) more diversely. For convenience of explanation, in the present invention, the plurality of impedance elements include the first impedance element Z1 and the second impedance element Z2 Let's take an example as an example.

The switching control unit 30 may provide a control signal to the switching unit SW.

Specifically, the switching controller 30 generates a control signal based on the information related to the resonance frequency stored in the storage unit 40, and provides the control signal to the switching unit SW. The switching unit SW includes a switching controller 30, The resonance frequency of the multiband antenna 1 can be varied by activating any one of the impedance elements Z1 and Z2 based on the control signal supplied from the control unit 32. [

That is, the switching control unit 30 generates a control signal based on information related to the resonance frequency stored in the storage unit 40, when receiving the input of the target resonance frequency from the outside (OT or other device, for example) To the switching terminal SP of the switching unit SW, it is possible to control which impedance element of the plurality of impedance elements Z1 and Z2 is activated.

The storage unit 40 may store information related to the resonance frequency.

The information related to the resonance frequency stored in the storage unit 40 may include a resonance frequency value when each of the plurality of impedance elements Z1 and Z2 is activated. The storage unit 40 may also be, for example, a memory.

More specifically, the information related to the resonance frequency may include a resonance frequency expected value when the first impedance element Z1 is activated and a resonance frequency expected value when the second impedance element Z2 is activated.

Accordingly, the switching control unit 30 changes the resonance frequency of the multi-band antenna 1 to the target resonance frequency by comparing the target resonance frequency provided from the outside OT with the information related to the resonance frequency stored in the storage unit 40 It is possible to determine which impedance element should be activated. Then, a control signal is generated and provided to the switching terminal SP based on the obtained result.

As described above, the multi-band antenna 1 of the present invention can vary the resonance frequency through the storage unit 40, the switching control unit 30, and the switching unit SW.

Such a resonance frequency change is possible due to the frequency characteristics of the capacitor and the inductor included in the switching unit SW. When the capacitor SW is applied to the switching unit SW and the inductor is applied with reference to FIGS. 6 and 7 The change of the current distribution of the transistor is examined.

A low-band current path is formed between the first ground G1 and the second ground G2 and a high-frequency current path is formed between the power feeder P and the antenna end AE. (High-band Current Path) may be formed.

The current distribution when a capacitor is applied to the switching part SW of the multi-band antenna 1 and when the inductor is applied will be described with reference to a low-band current path.

6, it can be seen that only the capacitor ZC is applied to the switching unit. In other words, it can be seen that the current is inverted (+) from + to - (due to the capacitor ZC), that is, the phase change is -90 degrees.

It is also known that when the capacitor ZC is applied to the conventional open portion (B in Fig. 1), the resonance length is shorter than when the open portion (B in Fig. 1) is simply connected (resonance length? have.

Referring to FIG. 7, it can be seen that only the inductor ZL is applied to the switching unit. That is, it can be confirmed that some distortion occurs in the current distribution in the region immediately before the phase change occurs due to the electric signal blocking characteristics of the inductor ZL. In addition, it can be confirmed that the phase change (E (phase change <90 °) is caused by the inductor ZL.

Of course, when the inductor ZL is applied to the conventional open portion (B in FIG. 1), it can be seen that the resonance length is shorter than when the open portion (B in FIG. 1) is simply connected (resonance length? have.

The multiband antenna 1 according to the embodiment of the present invention includes the switching unit SW having a plurality of impedance elements Z1 and Z2 so that the capacitor ZC and the inductor The resonance frequency can be easily shifted by using the frequency characteristic of the resonance frequency ZL and the phase change according to the frequency characteristic, and deterioration of the radiation performance can be prevented. Also, by disposing the switching unit SW in the conventional open part (B in Fig. 1), it is possible to reduce the loss due to the antenna gain reduction caused by the switching unit SW itself.

Hereinafter, a mobile terminal to which the multi-band antenna of FIG. 4 is applied will be described with reference to FIG.

FIG. 8 is a block diagram illustrating a mobile terminal to which the multi-band antenna of FIG. 4 is applied.

For reference, the mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP) slate PCs, tablet PCs, ultrabooks, wearable devices such as smartwatches, smart glass, HMDs (head mounted displays), etc.) May be included.

In addition, the configuration of the multi-band antenna described in this specification may be applied to a fixed terminal such as a digital TV, a desktop computer, a digital signage, and the like, except when it is applicable only to a mobile terminal.

8, 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. 8 are not essential for implementing a mobile terminal, so that the mobile terminal described herein may have more or fewer components than the components listed above.

The wireless communication unit 110 may be connected between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and the external server 100. [ Lt; RTI ID = 0.0 &gt; wireless &lt; / RTI &gt; 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 receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

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

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

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

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

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

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

In addition, the controller 180 may control at least some of the components discussed above to drive an application program stored in the memory 170. [ Furthermore, the controller 180 may operate at least two of the components included in the mobile terminal 100 in combination with each other for driving the application program.

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

At least some of the components may operate in cooperation with each other to implement a method of operation, control, or control of the mobile terminal 100. Also, the method of operation, control, or control of the mobile terminal 100 may be implemented on the mobile terminal 100 by driving at least one application program stored in the memory 170.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

1: Multi-band antenna AE: Antenna termination
G1: first ground portion G2: second ground portion
P: power supply SW: switching part
30: Switching control unit 40:
OT: External

Claims (10)

In a multi-band antenna capable of varying a resonant frequency,
A first grounding portion connected to an antenna end;
A feeding part connected to the first grounding part and supplying electricity;
A second grounding unit connected to the power feeding unit; And
And a switching unit connected to the power supply unit and the second ground unit,
Wherein the switching unit is located between the feeding unit and the second ground unit, and is connected in series with the second ground unit,
And the resonance frequency is varied by the switching unit
Multiband antenna.
The method according to claim 1,
The switching unit
A plurality of impedance elements,
And a switching terminal for selectively activating one of the plurality of impedance elements
Multiband antenna.
3. The method of claim 2,
The plurality of impedance elements
A first impedance element including a first inductor and a first capacitor connected in series,
And a second impedance element including a second inductor and a second capacitor connected in series,
Wherein the first inductor has an inductance value different from that of the second inductor, and the first capacitor has a capacitance value different from that of the second capacitor
Multiband antenna.
The method of claim 3,
Wherein at least one of the first capacitor and the second capacitor includes a plurality of capacitors coupled in series
Multiband antenna.
3. The method of claim 2,
The resonance frequency is changed to a lower frequency as the inductance value of the inductor included in the impedance element activated by the switching terminal is larger,
The smaller the capacitance value of the capacitor included in the impedance element activated by the switching terminal, the more the resonance frequency is varied to a higher frequency
Multiband antenna.
The method according to claim 1,
A switching controller for providing a control signal to the switching unit; And
And a storage unit in which information related to the resonant frequency is stored
Multiband antenna.
The method according to claim 6,
The switching unit includes:
And a switching terminal for selectively activating one of the plurality of impedance elements and the plurality of impedance elements,
Wherein the switching control unit supplies the control signal to the switching terminal
Multiband antenna.
8. The method of claim 7,
Wherein the information related to the resonance frequency stored in the storage unit includes a resonance frequency value when each of the plurality of impedance elements is activated,
Wherein the switching control unit generates the control signal based on information related to the resonance frequency
Multiband antenna.
The method according to claim 1,
A low band current path is formed between the first grounding unit and the second grounding unit,
A high band current path is formed between the feeding part and the antenna end
Multiband antenna.
10. A mobile terminal comprising a multi-band antenna according to any one of claims 1 to 9.

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