KR100807299B1 - Planar inverted f antenna and mobile communication terminal having the same - Google Patents

Abstract

A planar inverted F antenna and a mobile communication terminal having the same are provided to be miniaturized by easily attaching a passive element or an active element in series or in parallel. A planar inverted antenna(200) includes a ground plate(210), an irradiation plate(220), a short-circuit strip(230), a power feeding plate(240), and a sub irradiation plate(250). The ground plate provides an electrical ground. A protruded area for being in contact with the short-circuit strip is formed on a surface adjacent to the irradiation plate among faces of the ground plate. The size of the antenna can be curtailed by inserting a dielectric between the ground plate and the irradiation plate. The irradiation plate is arranged in an outer upper part of the ground plate in parallel to the ground plate. One end of the short-circuit strip is electrically connected to the ground plate and the other end of the short-circuit strip is electrically connected to the irradiation plate. The power feeding plate supplies a current to the irradiation plate. The sub irradiation plate is electrically connected to a first area(222) of the irradiation plate.

Description

Planar inverted F antenna and mobile communication terminal having the same

1 is a view showing the structure of a conventional planar inverted F antenna,

2 is a view showing the configuration of a preferred embodiment of a planar inverted F antenna according to the present invention;

3 is a plan view of a radiation plate employed in a planar inverted F antenna according to the present invention;

4 illustrates various types of shorting strips;

5 is a graph illustrating the reflection loss characteristics of the antenna for the case where the slit is not formed in the radiating plate of the planar inverted F antenna, the L-shaped slit and the U-shaped slit are formed;

FIG. 6 shows the return loss characteristics of the antenna when the flat inverted F antenna with the U-shaped slit and the short strip are provided with the stub and the folded radiation plate separately and with the stub and the folded radiation plate. One Graph,

7 is a graph showing the reflection loss characteristics according to the change in the distance between the folded radiation plate and the feed plate of the planar inverted F antenna according to the present invention,

8 is a graph showing the return loss characteristics according to the length change of the shorting strip of the planar inverted F antenna according to the present invention;

9 is a graph showing the return loss characteristics measured for the planar inverted F antenna according to the present invention,

10a to 10f show radiation patterns in the YZ plane and the XZ plane of a planar inverted F antenna according to the present invention at specific frequencies in the GSM900, GPS, DCS1800, UMTS, WLAN, and DMB frequency bands, and

11 is a diagram illustrating a configuration of a mobile communication terminal equipped with a planar inverted F antenna according to the present invention.

The present invention relates to a planar inverted F antenna and a mobile communication terminal having the same, and more particularly, to a multi-plane inverted F antenna capable of transmitting and receiving a signal of a multi-band frequency and a mobile communication terminal having the same.

With the rapid development of analog / digital communication technology, various kinds of mobile communication services using different frequency bands such as cellular, PCS, and GSM are currently provided. In addition, the provision of digital multimedia broadcasting (DMB) service, a next-generation mobile communication service in which broadcasting and communication are converged, has become a reality. As the mobile communication service is diversified as described above, the necessity of a multi-service terminal capable of accommodating a plurality of mobile communication services is increasing. One of the important considerations in such a multi-service terminal is that it must meet the trend of miniaturization, light weight and low power of the terminal with accommodating various communication services.

Antennas and various components mounted on the multi-service terminal have difficulty in development and manufacture because they must ensure normal operation in two or more frequency bands while satisfying existing size and electrical standards. Especially for cellular (824 ~ 894MHz frequency band) and PCS (1750 ~ 1870MHz frequency band), the center frequency is about 1GHz apart, and each center frequency is matched to the existing antenna because each center frequency is not an integer multiple of each other's harmonics. Designing a circuit alone is difficult to use in both frequency bands. In addition, the small antenna cannot be equipped with two different types of antennas due to the nature of being located at the minimum area of the outer surface of the terminal. One solution to this problem is to employ a small antenna based on Planar Inverted F Antenna (PIFA).

The planar inverted F antenna has an advantage that an impedance match can be easily obtained by moving a feed point without an additional matching circuit. In addition, the planar inverted F antenna has both vertical polarization and horizontal polarization at the same time, and thus has an advantage of improving average reception power in an indoor wireless environment having a large cross-polarization coupling. In addition, the planar inverted F antenna is capable of increasing bandwidth and gain by increasing the height, thereby reducing the size of the overall antenna by increasing the height. Built-in antennas, such as the planar inverted F antenna, can be built in the mobile communication terminal, which makes it possible to miniaturize the whole system, reduce inconvenience of use, and develop low-cost antennas. However, the internal antenna has a disadvantage of narrower bandwidth and lower efficiency than the external antenna, and in the case of a mobile communication terminal, since the terminal itself has a ground condition, the characteristics of the terminal are affected by the characteristics of the terminal. have.

1 is a view showing the structure of a conventional planar inverted F antenna.

Referring to FIG. 1, the conventional planar inverted F antenna 100 includes a ground plate 110, a radiation plate 120, an auxiliary radiating plate 130, a shorting pin 140, and a feeding pin 150. do.

The ground plate 110 is a structurally and electrically standardized component, and formally defines the shape of the entire antenna and electrically functions as a ground. The radiation plate 120 has a rectangular shape and is disposed in parallel with the ground plate 110 on the ground plate 110. The radiating plate 120 is partitioned into a plurality of regions 124 and 126 by the slots 122. The slot 122 allows the antenna 100 to accommodate a plurality of frequency bands. In addition, a plurality of stubs 128 are formed on the radiating plate 120 for impedance matching of high frequency band signals. The auxiliary radiating plate 130 is electrically connected to the first region 124 of the radiating plate 120 and is bent vertically toward the ground plate 110. The shorting pin 140 electrically connects the ground plate 110 and the radiating plate 120. The feed pin 150 supplies the current supplied from the feed line to the radiating plate 120.

Conventional planar inverted F antenna having the structure as described above can implement a multi band antenna by increasing the number of slots, but in this case, the bandwidth of the resonance frequency of each band is narrowed, and the influence of the surrounding environment is affected. There is a problem that can not easily receive stable characteristics. In addition, it is dependent on the influence of frequency and impedance according to design variables for each frequency band, and in order to obtain a wide resonance frequency bandwidth, the area of the radiating plate needs to be increased, thereby increasing the overall antenna size.

The technical problem to be achieved by the present invention is a planar inverted F antenna capable of increasing the gain and bandwidth by increasing the electrical volume of the antenna while at the same time obtaining a wideband characteristic in a high frequency band while miniaturizing the overall antenna size And to provide a mobile communication terminal having the same.

In order to achieve the above technical problem, the planar inverted F antenna according to the present invention, a ground plate made of a thin plate conductor; Radiation formed of a thin plate conductor spaced apart from the ground plate and divided into a first region forming a movement path of the first frequency band signal by a slot and a second region forming a movement path of the second frequency band signal. plate; The first strip and the second strip which are integrally formed are spaced apart from each other, and one ends of the first strip and the second strip are electrically connected to the ground plate and the radiating plate, respectively, so that the first strip and the second strip are electrically connected. A short strip on which a reactance component is generated between; And a feeding means electrically connected to the first region of the radiating plate to feed a current to the radiating plate.

Preferably, further comprising an auxiliary radiating plate electrically connected to the first region of the radiating plate, the auxiliary radiating plate disposed to have a predetermined angle with the radiating plate, wherein the radiating plate and the auxiliary radiating plate are rectangular, The spin plate and the auxiliary spin plate is preferably connected at an angle of 90 degrees.

Preferably, a plurality of stubs are spaced apart from each other and protrude toward the first region in the second region of the radiating plate.

Preferably, the first strip and the second strip are each formed of a first extension part extending in one direction and a second extension part bent at a predetermined angle from the first extension part, and the radiating plate is rectangular, Preferably, the first extension part extends along the short side of the radiating plate, and the second extension part extends along the long side of the radiating plate.

Preferably, the first strip is disposed to be spaced apart from the radiating plate to generate a reactance component between the radiating plate, and the second strip is disposed to be spaced apart from the ground plate to be spaced apart from the ground plate. A reactance component is generated.

Preferably, the radiating plate and the ground plate are disposed in parallel to each other, the radiating plate is located on the outer upper portion of the ground plate.

According to another aspect of the present invention, there is provided a mobile communication terminal including a planar inverted F antenna, the planar inverted F antenna comprising: a ground plate made of a thin plate conductor; Radiation formed of a thin plate conductor spaced apart from the ground plate, and divided into a first region forming a movement path of the first frequency band signal by a slot and a second region forming a movement path of the second frequency band signal. plate; The first strip and the second strip which are integrally formed are spaced apart from each other, and one ends of the first strip and the second strip are electrically connected to the ground plate and the radiating plate, respectively, so that the first strip and the second strip are electrically connected. A short strip on which a reactance component is generated between; And a feeding means electrically connected to the first region of the radiating plate to feed a current to the radiating plate.

As a result, broadband characteristics can be obtained in a high frequency band through impedance matching by short-circuit strips, and the size of the overall antenna can be reduced due to easy parallelization of passive elements or active elements, and resonance characteristics in a low frequency band. And the electrical volume of the antenna is increased to obtain high gain and wide bandwidth.

Hereinafter, exemplary embodiments of a planar inverted F antenna and a mobile communication terminal having the same according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing the configuration of a preferred embodiment of a planar inverted F antenna according to the present invention, Figure 3 is a plan view of a radiation plate employed in the planar inverted F antenna according to the present invention.

2 and 3, the planar inverted F antenna 200 according to the present invention includes a ground plate 210, a radiating plate 220, a shorting strip 230, a feed plate 240, and an auxiliary radiating plate. 250.

The ground plate 210 is made of a rectangular thin plate conductor and provides electrical ground as a component that is a reference form of the antenna as a whole. A protruding region 212 is formed at a short side of the ground plate 210 adjacent to the radiation plate 220 to contact the shorting strip 230. In addition, a feeding hole (not shown) in which a power supply line such as a coaxial cable is inserted is formed in the protruding region 212 of the ground plate 210.

The radiation plate 220 is made of a thin film conductor, and is responsible for radiation for input and output of signals. The radiation plate 220 is disposed in parallel with the ground plate 210 on the outer upper portion of the ground plate 210. Therefore, when the radiating plate 220 is projected on the plane where the ground plate 210 is located, the projection image of the radiating plate 220 and the ground plate 210 do not overlap each other. By arranging the radiating plate 220 as described above, the electrical volume of the antenna 200 is increased to secure high gain and wide bandwidth. In addition, inserting a dielectric between the ground plate 210 and the radiating plate 220 may further reduce the size of the antenna 200. The shape of the radiation plate 220 is preferably a rectangular shape for convenience of manufacture, it may have a variety of shapes within the scope of the technical idea of the present invention.

The radiating plate 220 is divided into a first region 224 forming a moving path of the high frequency band signal and a second region 226 forming a moving path of the low frequency band signal by the slot 222. In this case, a shorting strip 230, a power feeding plate 240, and an auxiliary radiating plate 250 are connected to the first region 224 of the radiating plate 220. In addition, a plurality of stubs 228 which are spaced apart from each other and protrude toward the first region 224 are formed in the second region 226 of the radiating plate 220. This stub 228 improves impedance matching for signals in the high frequency band.

On the other hand, the size (ie, length and width) and shape of the slot formed in the radiating plate is an important factor in determining the characteristics of the antenna. That is, the shape of the current flow from the feeder plate 240 to the short-circuit strip 230 or vice versa by the slot 222 formed in the radiating plate 220 determines the shape of the band of the antenna 220. Characteristics are determined. In the case of the planar inverted F antenna 200 according to the present invention, a dual band characteristic is obtained by forming a U-shaped slot 222 in the radiating plate 220. The U-shaped slot 222 preferably has a rectangular shape for ease of manufacture, but may have a variety of shapes in addition to. Since the radiating plate 220 is partitioned into the respective regions 224 and 226 by the U-shaped slot 222 formed in the radiating plate 220, the current flow in each of the regions 224 and 226 becomes clear. Dual band characteristics can be obtained. In addition, when there are a plurality of slits in the spin plate, the spacing between the slots is also an important factor in determining the characteristics.

The shorting strip 230 is formed of a strip-shaped strip line, one end of which is electrically connected to the ground plate 210, and the other end of which is electrically connected to the radiating plate 220. The shorting strip 230 is disposed to be spaced apart from each other with the first strip 232 and the second strip 234 formed integrally with a space. In this case, the first strip 232 is disposed to be spaced apart from the radiating plate 220 to generate a reactance component between the radiating plate 220 and the second strip 234 to be spaced apart from the ground plate 210. Thus, a reactance component is generated between the ground plate 210 and the ground plate 210. In addition, the first strip 232 and the second strip 234 are each bent at a predetermined angle from the first extensions 236 and 237 and the first extensions 236 and 237 extending in one direction, respectively. Extensions 238 and 239. When the radiation plate 220 is rectangular, the first extension parts 236 and 237 extend along the short sides of the radiation plate 220, and the second extension parts 238 and 239 extend the long sides of the radiation plate 220. It is preferable to extend accordingly. 4 shows various types of shorting strips.

The conventional planar inverted F antenna 100 has a configuration in which the radiating plate and the ground plate are electrically connected by using a shorting plate or a shorting pin. Since the short-circuit board and the short-circuit pin can be impedance matched only by the change of position, it is cumbersome and economical to manufacture a separate device for impedance matching. However, the shorting strip 230 applied to the planar inverted F antenna 200 according to the present invention has an advantage that impedance matching is possible by adjusting the length. In particular, the shorting strip 230 applied to the planar inverted F antenna 200 according to the present invention not only generates a reactance component but also generates a reactance component between the ground plate 210 and the radiating plate 220. Therefore, there is no need to add a separate device for impedance matching.

The feed plate 240 is electrically connected to the first region 222 of the radiating plate 220 to feed current to the radiating plate 220. In this case, the feed plate 240 is positioned on the same plane as the auxiliary radiating plate 250. Instead of the feed plate 240, a feed pin or a feed line may be employed.

The auxiliary radiating plate 250 is made of a thin film conductor plate and is electrically connected to the first region 222 of the radiating plate 220. The auxiliary radiating plate 250 is also preferably manufactured in a rectangular shape similarly to the radiating plate 220, but may have various shapes. The auxiliary radiating plate 250 is connected to the radiating plate 220 which is bent at an angle (for example, 90 °) toward the ground plate 210. The auxiliary radiating plate 250 may be formed by extending one side of the radiating plate 220 and then bending it toward the ground plate 210. As described above, the total size of the antenna 200 may be reduced by bending the auxiliary radiating plate 250 toward the ground plate 210.

On the other hand, the auxiliary radiating plate 250 is disposed adjacent to the feed plate 240 on the same plane as the feed plate 240. At this time, by adjusting the length of the auxiliary radiation plate 250 (that is, the length of the side in contact with the radiation plate 220) by changing the interval with the feed plate 240, the coupling effect with the feed plate 240 can be induced. Can be. By this coupling effect, the frequency of the dual resonance band obtained by the U-shaped slot 222 can be adjusted to a wide bandwidth. In addition, by adjusting the height of the auxiliary radiating plate 250 (that is, the length of the side perpendicular to the radiating plate 220) to change the distance from the grounding plate 210, the coupling effect with the grounding plate 210 is improved. Can be induced. In addition, the auxiliary radiating plate 250 and the power supply by the coupling effect induced between the auxiliary radiating plate 250 and the feed plate 240 and the coupling effect induced between the auxiliary radiating plate 250 and the ground plate 210. Capacitance is formed between the plates 240 and between the auxiliary radiating plate 250 and the ground plate 210 to improve impedance matching in the high frequency band.

FIG. 5 is a graph illustrating the reflection loss characteristics of the antenna when the slits are not formed on the radiating plate of the planar inverted F antenna, when the L-shaped slits are formed and when the U-shaped slits are formed. At this time, the shorting strip, the stub, and the folded copy plate were removed from the radiating plate in order to accurately grasp the change with or without the slit.

Referring to FIG. 5, when the slit is not formed in the radiating plate, a resonant frequency is generated in the middle frequency band, and when the L-shaped slit is formed, the resonant frequency is generated in the high frequency band and the resonant frequency generated in the middle frequency band is The slit is biased towards the lower frequencies than without it. In contrast, when the U-shaped slit is formed on the radiating plate, resonance frequencies are generated in the low frequency band and the high frequency band, respectively. According to these experimental results, by forming a U-shaped slit on the radiating plate, it is possible to obtain a resonance frequency at a preferable resonance frequency (900 MHz frequency band and 2.1 GHz frequency band). However, even when the U-shaped slit is formed on the radiating plate, there is a problem in that there is no band having a return loss coefficient of -6 dB or less in the low frequency band.

FIG. 6 shows the return loss characteristics of the antenna when the flat inverted F antenna with the U-shaped slit and the short strip are provided with the stub and the folded radiation plate separately and with the stub and the folded radiation plate. One graph.

Referring to FIG. 6, when the shorting strip is provided, the reflection loss coefficient in the low frequency band does not change significantly by the addition of the stub and the folded radiation plate, but wideband characteristics can be obtained in the high frequency band. In addition, when only the stub is added, one resonant frequency is generated in the high frequency band, but when the folded copy plate is added, a plurality of resonant frequencies are generated in the high frequency band. In particular, when both the stub and the folded copy plate are added, a plurality of resonant frequencies (ie, 2.1 GHz frequency band and 2.4 GHz frequency band) can be obtained while obtaining broadband characteristics. Based on the experimental results, it is possible to selectively add a stub and a folded copy plate to have a wideband characteristic in the high frequency band.

7 is a graph illustrating the reflection loss characteristics according to the change in the distance between the folded radiation plate and the feed plate of the planar inverted F antenna according to the present invention. At this time, as the length of the folded copy plate increases, the distance between the folded copy plate and the feed line becomes shorter.

Referring to FIG. 7, it can be seen that the distance change between the folded radiation plate and the feed line does not affect the low frequency band, but there is a change in the band where the reflection loss coefficient is -6 dB in the high frequency band. Based on the experimental results, it is possible to induce the coupling effect by adjusting the distance between the feeder and the folded radiation plate so that the antenna has a widening characteristic.

8 is a graph showing the return loss characteristics according to the change in length of the shorting strip of the planar inverted F antenna according to the present invention. At this time, the antenna is provided with a folded radiation plate and a stub.

Referring to FIG. 8, in the case of the shorting plate, a plurality of resonance frequencies are generated in the high frequency region, but the reflection loss coefficient of the low frequency band is -3 dB, which is not good. On the other hand, in the case of the short strip, it is less sensitive to the change in length in the low frequency band, but the change in return loss characteristic with the length is severe in the high frequency band. In other words, when the length of the short strip is set to 35.55 mm, wideband characteristics are exhibited in the high frequency region of the 1.8 GHz band. However, when the length of the short strip is set to 85.55 mm, a plurality of resonant frequencies (i.e., 1.8 GHz frequency band and 2.7 GHz frequency band) occur in the high frequency region, but there is no band having a return loss coefficient of -6 dB or less. . According to the experimental results, impedance matching of -6 dB or less can be obtained in a desired frequency band by adjusting the length of the short strip.

9 is a graph showing the return loss characteristics measured for the planar inverted F antenna according to the present invention.

The antenna used for the measurement has a radiating plate with a U-shaped slot, a folded radiation plate, a shorting strip and a stub, and is fed through a coaxial cable. The specifications of the antenna used for the measurement are shown in the following table.

Component Specification Ground plate Rectangular conductor plate with 71 mm long side and 40 mm short side Spin plate Rectangular conductor plate with 36 mm long side and 16 mm short side Distance between ground plane and reflector 6 mm Folded copy Conductor plate 14 mm long, 5 mm short, and 6 mm apart from the feeder Paragraph strip Conductor strip length 64 mm

Referring to FIG. 9, the return loss coefficient of the two frequency bands is -6 dB or less, and each of the frequency bands is a low frequency band of 880 to 965 MHz and a medium and high frequency band of 1500 to 2710 MHz. The low frequency band includes the 880 to 960 MHz band, which is the GSM900 band, and the medium and high frequency bands are the 1574 to 1577 MHz band, which is the GPS band, the 1710 to 1880 MHz band, which is the DCS1800 band, the 1920 to 2170 MHz band, which is the UMTS band, and the 2400 to 2483 MHz band, which is the WLAN band. And a 2605 to 2655 MHz band that is a DMB band. According to the measurement results, the planar inverted F antenna according to the present invention used in the measurement has a return loss coefficient of -6 dB in the GSM900, GPS, DCS1800, UMTS, WLAN, and DMB frequency bands, and is provided through different frequency bands. It can be seen that it is suitable as a multiple antenna capable of accommodating various communication services.

10A to 10F illustrate radiation patterns in the YZ plane and the XZ plane of the planar inverted F antenna according to the present invention at specific frequencies in the GSM900, GPS, DCS1800, UMTS, WLAN, and DMB frequency bands.

10A to 10F, the planar inverted F antenna according to the present invention exhibits a radiation pattern similar to the radiation pattern generally shown in the monopole antenna. That is, the planar inverted F antenna according to the present invention forms an omnidirectional radiation pattern, and the 915 MHz band of GSM900 band, 1576 MHz band of GPS band, 1785 MHz band of DCS1800 band, 2170 MHz band of UMTS band, and 2400 MHz band of WLAN band. The antenna gains in the 2630MHz band of the DMB band are 1.02, 2.7, 5.43, 4.56, 1.52, and 2.92 dBi, respectively.

11 is a diagram illustrating a configuration of a mobile communication terminal equipped with a planar inverted F antenna according to the present invention.

Referring to FIG. 11, the planar inverted F antenna 200 according to the present invention is mounted on an inner side surface of the mobile communication terminal 300. The thickness of mobile terminals currently on the market is more than 6 mm. Therefore, the distance between the ground plate 210 and the radiation plate 220 of the planar inverted F antenna 200 is preferably set to 6mm. In addition, the width of the short strip 230 is preferably set to 1mm.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

According to the planar inverted F antenna and a mobile communication terminal having the same according to the present invention, by adopting a short-circuit strip which generates a reactance component by itself, it is possible to obtain broadband characteristics in the high frequency band through impedance matching, It is easy to attach the elements in parallel and it is possible to miniaturize the overall antenna and the mobile communication terminal. Also, by connecting the short strip to the end of the radiating plate, resonance characteristics in a low frequency band can be obtained. Furthermore, by placing the radiating plate outside the ground plate, the electrical volume of the antenna can be increased to obtain high gain and wide bandwidth.

Claims (13)

A ground plate made of a thin plate conductor; Radiation formed of a thin plate conductor spaced apart from the ground plate and divided into a first region forming a movement path of the first frequency band signal by a slot and a second region forming a movement path of the second frequency band signal. plate; The first strip and the second strip which are integrally formed are spaced apart from each other, and one ends of the first strip and the second strip are electrically connected to the ground plate and the radiating plate, respectively, so that the first strip and the second strip are electrically connected. A short strip on which a reactance component is generated between; And And a feeding means electrically connected to the first region of the radiating plate to feed a current to the radiating plate. The method of claim 1, And an auxiliary radiating plate electrically connected to the first region of the radiating plate and disposed to have a predetermined angle with the radiating plate. The method of claim 2, And the radiating plate and the auxiliary radiating plate are rectangular in shape, and the radiating plate and the auxiliary radiating plate are connected at an angle of 90 °. The method according to claim 1 or 2, And a plurality of stubs which are spaced apart from each other in the second region of the radiating plate and protrude toward the first region. The method according to claim 1 or 2, And the first strip and the second strip each include a first extension part extending in one direction and a second extension part bent at a predetermined angle from the first extension part. The method of claim 5, The radiating plate is rectangular, wherein the first extension portion extends along a short side of the radiating plate, and the second extension portion extends along a long side of the radiating plate. The method according to claim 1 or 2, The first strip is disposed to be spaced apart from the radiating plate to generate a reactance component between the radiating plate, and the second strip is arranged to be spaced apart from the ground plate to generate a reactance component between the ground plate. Planar inverted F antenna, characterized in that. The method according to claim 1 or 2, And the radiating plate and the ground plate are disposed in parallel to each other, and the radiating plate is positioned above the outer side of the ground plate. A mobile communication terminal having a planar inverted F antenna, The planar inverted F antenna, A ground plate made of a thin plate conductor; Radiation formed of a thin plate conductor spaced apart from the ground plate and divided into a first region forming a movement path of the first frequency band signal by a slot and a second region forming a movement path of the second frequency band signal. plate; The first strip and the second strip which are integrally formed are spaced apart from each other, and one ends of the first strip and the second strip are electrically connected to the ground plate and the radiating plate, respectively, so that the first strip and the second strip are electrically connected. A short strip on which a reactance component is generated between; And And a feeding means electrically connected to the first area of the radiating plate to feed a current to the radiating plate. The method of claim 9, And an auxiliary radiating plate electrically connected to the first region of the radiating plate and disposed to have a predetermined angle with the radiating plate. The method according to claim 9 or 10, And a plurality of stubs which are spaced apart from each other in the second region of the radiating plate and protrude toward the first region. The method according to claim 9 or 10, The first strip is disposed to be spaced apart from the radiating plate to generate a reactance component between the radiating plate, and the second strip is arranged to be spaced apart from the ground plate to generate a reactance component between the ground plate. Mobile communication terminal, characterized in that. The method according to claim 9 or 10, And the radiating plate and the ground plate are disposed in parallel to each other, and the radiating plate is positioned above the outer side of the ground plate.

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