KR101116006B1 - Internal antenna for low frequency band and portable device having the same - Google Patents

Abstract

A low frequency band internal antenna and a portable terminal having the same are provided to form a pattern for resonant frequency tuning for easy tuning of a resonant frequency. The built-in antenna for the low frequency band presented includes a polyhedron block; A first radiation pattern formed on the polyhedron block; A second radiation pattern formed to cover a portion of the upper surface of the polyhedron block and connected to one side of the first radiation pattern; And a third radiation pattern formed on the polyhedron block, one end of which is connected to one side of the second radiation pattern, and the other end of which is connected to the other side of the second radiation pattern, wherein the connection portion of the third radiation pattern and the second radiation pattern is formed. Etch to tune the resonance frequency.

Description

Internal antenna for low frequency band and portable device having the same

The present invention relates to a low frequency band internal antenna and a portable terminal having the same, and more particularly, to a low frequency band internal antenna and a portable terminal having the same.

With the spread of mobile terminals, it is possible to make and receive calls anytime and anywhere, which has revolutionized the real world. In addition, as more users always carry a mobile communication terminal, various functions are added to help real life. Among the various functions of the mobile communication terminal, the rapid progress is the part related to multimedia, and mobile communication terminals to which functions for generating and playing various multimedia files are added are pouring out.

That is, the mobile communication terminal is no longer treated as a wireless telephone for voice call only, but as an integrated portable device in which communication means are combined with various user-friendly functions and entertainment functions. As users watch a movie, listen to music, communicate with each other, and make a voice call with only one mobile communication terminal, user's time to carry and use the mobile communication terminal is gradually increasing. However, since multimedia files such as downloaded movies and music have to be updated by the user, addition of FM radio broadcast reception listening function is required in order to enjoy fresher contents without additional burden.

Therefore, among the recent mobile communication terminals emphasizing multimedia functions, an FM radio broadcast receiver is built in the mobile communication terminal focused on music-related functions so that the user can listen to the FM radio broadcast. To this end, a built-in antenna for the FM band is mounted on the mobile communication terminal.

However, there is a problem that the built-in antenna for the FM band is formed different from the resonant frequency at the time of design and the mass production. This is a problem that occurs in the mass production process during the mass production of the built-in antenna for the FM band, a problem that generally appears during the mass production of the built-in antenna for the FM band.

The present invention has been proposed in view of the above-described conventional problems, and an object thereof is to provide a low frequency band internal antenna and a portable terminal having the same to form a pattern for resonant frequency tuning for easy tuning of a resonant frequency. .

Another object of the present invention is to provide a low frequency band built-in antenna for minimizing the external shape change of the antenna and tuning the resonant frequency, and a portable terminal having the same.

In order to achieve the above object, a low-frequency band built-in antenna according to the present invention, a polyhedral block; A first radiation pattern formed on the polyhedron block; A second radiation pattern formed to cover a portion of the upper surface of the polyhedron block and connected to one side of the first radiation pattern; And a third radiation pattern formed on the polyhedron block, one end of which is connected to one side of the second radiation pattern, and the other end of which is connected to the other side of the second radiation pattern, wherein the connection portion of the third radiation pattern and the second radiation pattern is formed. Etch to tune the resonance frequency.

The third radiation pattern is composed of a plurality of radiation lines formed in a strip form parallel to each other along the outer surface of the polyhedron block.

One or more of the plurality of radiation lines are etched to tune the resonance frequency.

The first radiation pattern is formed in the form of a winding along the outer surface of the polyhedron block.

The other side of the first radiation pattern is formed as a feeder on one surface of the polyhedron block.

A coupling pattern is formed on the polyhedron block and is separated from the first radiation pattern, the second radiation pattern, and the third radiation pattern.

The coupling pattern includes a ground terminal connected to the ground terminal.

In order to achieve the above object, a portable terminal having a low frequency band built-in antenna according to the present invention includes any one of the low frequency band built-in antennas.

The built-in antenna for a low frequency band according to the present invention can form a pattern for resonant frequency tuning, thereby tuning the resonant frequency through fine etching of the pattern for resonant frequency tuning.

Incidentally, the built-in antenna for the low frequency band can fine tune the resonance frequency tuning pattern, thereby minimizing the external shape change of the antenna and tuning the resonance frequency.

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. . First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are designated as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

Hereinafter, a low frequency band built-in antenna and a portable terminal having the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining a low-frequency internal antenna for the band according to an embodiment of the present invention.

As shown in FIG. 1, the low-frequency band internal antenna includes a polyhedron block 100 formed of a magnetic material, a first radiation pattern 200 formed in a shape wound along an outer surface of the polyhedron block 100, and a polyhedron. The second radiation pattern 300 is formed to cover a portion of the upper surface of the block 100 and is connected to one side of the first radiation pattern 200, and is formed in the polyhedral block 100, one end of the second radiation pattern 300 The third radiation pattern 400 is connected to one side and the other end is connected to the other side of the second radiation pattern (300). At this time, the third radiation pattern 400 is a resonance frequency tuning pattern. That is, the low frequency band built-in antenna tunes the resonance frequency by etching the connection part 450 (that is, the portion where the third radiation pattern 400 is connected to the second radiation pattern 300).

The polyhedron block 100 is composed of a polyhedron magnetic material. Magnetic material (Magneto-dielectric) refers to a material that can be magnetic, and there are iron oxide, chromium oxide, cobalt, ferrite and the like. In general, ferrite is used as a magnetic material constituting the polyhedral block 100.

Equation 1 is an equation indicating that the bandwidth (BW) of the antenna increases as the ratio between the permeability and the dielectric constant increases when the antenna size does not change. Where λ ₀ is the wavelength, μ _r is the permeability, ε _r is the dielectric constant, and t is the thickness of the antenna. In general, the permeability of the high dielectric constant applied to the antenna is less than the permittivity. However, when a magnetic material having a permeability greater than the permittivity (the magnetic permeability applied in the embodiment of the present invention is about 18 and the permittivity is about 10), a dielectric having a high dielectric constant at the same antenna size is used based on Equation 1. It is possible to implement a wider bandwidth than when. Therefore, when the antenna for the low frequency band is implemented using a high dielectric constant dielectric block for miniaturization, the narrowing of the bandwidth is overcome by using the low dielectric constant and permeability of the magnetic material, thereby minimizing the antenna while maintaining the bandwidth. . On the other hand, since the polyhedral block 100 applied to the present invention has a different permeability and permittivity, it is a matter of course that can be selected according to the resonance frequency to be implemented. In addition, the size and shape of the polyhedral block 100 may vary depending on the frequency band to be implemented.

2 is a view for explaining an equivalent circuit of a low-frequency band built-in antenna according to an embodiment of the present invention.

As shown in FIG. 2, in the equivalent circuit of the low-band internal antenna, the first radiation pattern 200, the second radiation pattern 300, and the third radiation pattern 400 operate as an inductor. Here, the connection portion 450 (that is, the portion connected to the second radiation pattern 300) of the third radiation pattern 400 operates as a switch. That is, each of the radiation lines constituting the third radiation pattern 400 operates as an inductor, and the connection portion 450 of each radiation line operates as a switch. At this time, the first radiation pattern 200, the second radiation pattern 300 and the third radiation pattern 400 has a fixed inductance value because the length, line width, and spacing between the radiation lines are fixed according to the frequency band to be implemented. Has

The resonance frequencies of the first radiation pattern 200, the second radiation pattern 300, and the third radiation pattern 400 are calculated using Equation 2 below.

Here, L _t = L _a + L _sd // L _s4 // L _s3 // L _s2 // L _s1 , and C _t is the coupling capacitance.

In order to move the resonance frequency downward, the connection portions 450 of the radiation lines L s ₁ to L s ₄ of the third radiation pattern 400 are etched to disconnect the respective radiation lines. Thus, when the equation (2) radiation line L _s1 ~ L _s4 open (open) the radial line L _s1 ~ L _s4 are connected in parallel by etching a connecting portion (450) in the increased the total inductance value (L _t) resonance The frequency moves downward.

3 is an exploded view for explaining the radiation pattern of FIG.

As shown in FIG. 3, the first radiation pattern 200 is formed in a winding form (ie, a helical shape) along the outer surface of the polyhedron block 100. In the first radiation pattern 200, the radiation lines I ₁ to I ₈ formed on the first side surface 100a of the polyhedral block 100 are connected to the radiation lines I ₁ to I ₈ formed on the second side surface 100b, respectively. It is configured. To FIG radiation lines I ₁ ~ I ₈ and the second radiation line formed on a side surface (100b) I ₁ ~ I ₈ a are illustrated as being separate, Figure 3 3, formed on a first side (100a) in a state of Fig. 1 In some embodiments, the first radiation pattern 200 may be wound along the outer surface of the polyhedron block 100 starting from one side of the second side surface 100b of the polyhedron block 100 to form one radiation line (ie, a helical shape). Spin line). One side (eg, I ₈ ) of the first radiation pattern 200 is connected to the second radiation pattern 300. That is, the radiation line I ₈ formed on the second side surface 100b is connected to one side of the second radiation pattern 300 formed on the upper surface of the polyhedron block 100. The other side (eg, I ₁ ) of the first radiation pattern 200 is connected to a feed end of the printed circuit board 600 to be described later. In this case, the length, line width, and spacing between the radiation lines of the first radiation pattern 200 may vary depending on the frequency band to be implemented.

The second radiation pattern 300 is formed to cover a portion of the upper surface of the polyhedron block 100. That is, the second radiation pattern 300 is formed so as to cover the remaining region except for the region where the first radiation pattern 200 is formed in the upper surface of the polyhedral block 100. In this case, the second radiation pattern 300 is formed to be spaced apart from the radiation line (ie, the radiation line I ₈ ) located at one end of the first radiation pattern 200.

The third radiation pattern 400 is formed along the outer surface of the polyhedron block 100, and both ends thereof are connected to both sides of the second radiation pattern 300, respectively. That is, the third radiation pattern 400 is the other surface except the upper surface of the polyhedral block 100 on which the second radiation pattern 300 is formed (ie, the first side surface 100a, the second side surface 100b, and the bottom surface). ) And a plurality of radiation lines (for example, L s ₁ to L s ₄ , L _sd ) formed in the form of strips parallel to each other. At this time, one end of each of the plurality of radiation lines constituting the third radiation pattern 400 is connected to one side of the second radiation pattern 300, the other end is connected to the other side of the second radiation pattern 300.

Here, the connection part 450 connected to the second radiation pattern 300 in the third radiation pattern 400 is used as the resonance frequency tuning pattern of the built-in antenna for low frequency band. That is, the connection unit 450 is composed of the radiation lines L s ₁ to L s ₄ of the third radiation pattern 400, and the resonance frequency by etching one or more of the radiation lines L s ₁ to L s ₄ connected to the second radiation pattern 300. Tune the At this time, the radiation line L _sd of the third radiation pattern 400 is connected to the ground terminal of the printed circuit board to be described later.

The coupling pattern 500 is formed independently of the second side surface 100b of the polyhedron block 100. That is, the coupling pattern 500 is the third emission line radiation line between the L _sd and L _s4 of the radiation pattern (400) L _sd and L _s4 formed on the second side (100b) of the polyhedral block 100, and a predetermined It is formed spaced apart. Later, when the second side surface 100b of the polyhedral block 100 is mounted on the printed circuit board 600 with the lower surface, the coupling pattern 500 may include the second radiation pattern 300 and the third radiation pattern ( Coupling the flow of current into 400).

FIG. 4 is a diagram illustrating a change of a resonance frequency according to etching of the frequency tuning pattern of FIG. 1. Here, '○' shown in FIG. 4 means that the frequency tuning pattern is closed (ie, connected), and '×' means that the frequency tuning pattern is open (ie, disconnected).

First, the resonance frequency is measured in a state in which all of the radiation lines L s ₁ to L s ₄ of the third radiation pattern 400 are connected. That is, the result of measuring the resonant frequency of the built-in antenna for low frequency band produced in mass. As a result, as shown in "A" in FIG. 4, the resonance frequency was measured.

Next, the radiation lines L s ₁ to L s ₄ of the third radiation pattern 400 are etched one by one, and then the resonance frequency is measured. That is, the resonance frequency is measured after the radiation line L _s1 is opened by etching, the resonance frequency is measured after the radiation line L _s2 is opened by etching, and the resonance frequency is measured after the radiation line L _s3 is opened by etching. After etching and opening the radiation line L _s4 , measure the resonance frequency. As a result, as shown in " B " in FIG. 4, the resonance frequency was measured.

Next, after the two radiation lines L s ₁ to L s ₄ of the third radiation pattern 400 are etched, the resonance frequency is measured. That is, (L _s1 , L _s2 ), (L _s1 , L _s3 ), (L _s1 , L _s4 ), (L _s2 , L _s3 ), (L _s2 , L _s4 ), (L _s3 , L _s4 ) } And open each of the two radiating lines and measure the resonant frequencies. As a result, as shown in " C " in FIG. 4, the resonance frequency was measured.

Next, after etching the radiation lines Ls1 to Ls4 of the third radiation pattern 400 by three, the resonance frequency is measured. That is, three resonance lines are opened after each of the following resonances, such as {(L _s1 , L _s2 , L _s3 ), (L _s1 , L _s2 , L _s4 ), (L _s2 , L _s3 , L _s4 )}. Measure the frequency. As a result, as shown in " D " in FIG. 4, the resonance frequency was measured.

Finally, the resonance frequency is measured after etching the radiation lines Ls1 to Ls4 of the third radiation pattern 400. That is, the resonance frequency is measured after all the radiation lines are opened as in {(L _s1 , L _s2 , L _s3 , L _s4 )}. As a result, as shown in "E" in Fig. 4, the resonance frequency was measured.

As described above, it can be seen that tuning of the resonance frequency is possible through etching of the resonance frequency tuning pattern (that is, the radiation lines L s ₁ to L _s4 of the third radiation pattern 400). Here, it can be seen from the experimental results that frequency adjustment of about 3 MHz per one radiation line is possible. As described above, the low-frequency band built-in antenna may form a pattern for resonant frequency tuning, thereby tuning the resonant frequency through fine etching of the pattern for resonant frequency tuning.

Incidentally, the built-in antenna for the low frequency band can fine tune the resonance frequency tuning pattern, thereby minimizing the external shape change of the antenna and tuning the resonance frequency.

5 is a block diagram illustrating a printed circuit board of a portable terminal to which a low frequency band embedded antenna according to an embodiment of the present invention is applied, and FIG. 6 is a printed circuit of a low frequency band embedded antenna according to the present invention. 7 is a structural diagram illustrating a state mounted on a substrate, and FIG. 7 is a diagram illustrating a printed circuit board of a portable terminal to which an embedded antenna for low frequency band according to another embodiment of the present invention is applied.

As shown in FIG. 5, the low frequency band built-in antenna of the present invention is mounted in the NO-GND region 620 on the printed circuit board of the portable terminal. In general, the NO-GND region 620 is formed at one side of the printed circuit board 600 and refers to a space for keeping a distance from other chips mounted on the printed circuit board 600. The first conductive pad 640 and the second conductive pad 660 are formed on the NO-GND region 620.

As illustrated in FIG. 6, the first conductive pad 640 is used as a feed end, and one side (ie, one side) of the first radiation pattern 200 formed at one end of the second side surface 100b of the polyhedron block 100. I ₈ ) and soldered (Soldering) is connected. The second conductive pad 660 is soldered and connected to the coupling pattern 500 formed at the other end of the second side surface 100b of the polyhedral block 100. In this case, as shown in FIG. 7, in order to firmly support the polyhedral block 100, a third conductive pad 680 soldered and connected to one side (ie, L _sd ) of the third radiation pattern 400 is added. It may be formed as.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

1 is a view for explaining a low-frequency internal antenna for the band according to an embodiment of the present invention.

2 is a view for explaining an equivalent circuit of a built-in antenna for a low frequency band according to an embodiment of the present invention.

3 is an exploded view for explaining the radiation pattern of FIG.

4 is a view for explaining a change in resonant frequency according to the etching of the frequency tuning pattern of FIG.

5 is a configuration diagram illustrating a printed circuit board of a portable terminal to which a built-in antenna for a low frequency band according to an embodiment of the present invention is applied.

6 is a structural diagram illustrating a state in which a low frequency band built-in antenna according to the present invention is mounted on a printed circuit board of a portable terminal.

FIG. 7 is a block diagram illustrating a printed circuit board of a portable terminal to which a built-in antenna for a low frequency band according to another embodiment of the present invention is applied. FIG.

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

100: polyhedron block 100a: first side

100b: second side 200: first radiation pattern

300: second radiation pattern 400: third radiation pattern

450: connection portion 500: coupling pattern

600: printed circuit board 620: NO-GND area

640: first conductive pad 660: second conductive pad

680: third conductive pad

Claims (8)

Polyhedral blocks; A first radiation pattern formed on the polyhedron block; A second radiation pattern formed to cover a portion of an upper surface of the polyhedron block and connected to one side of the first radiation pattern; And Is formed in the polyhedral block, one end is connected to one side of the second radiation pattern, the other end includes a third radiation pattern connected to the other side of the second radiation pattern, The internal antenna for the low frequency band, characterized in that for tuning the resonance frequency by etching the connection portion of the third radiation pattern and the second radiation pattern. The method according to claim 1, The third radiation pattern is, Built-in antenna for low frequency band, characterized in that consisting of a plurality of radiation lines formed in a strip form parallel to each other along the outer surface of the polyhedral block. The method according to claim 2, Low frequency band built-in antenna, characterized in that for tuning the resonance frequency by etching one or more of the plurality of radiation lines. The method according to claim 1, The first radiation pattern, Low frequency band built-in antenna, characterized in that formed in the form of a winding along the outer surface of the polyhedral block. The method according to claim 1, The other side of the first radiation pattern is a low-frequency band built-in antenna, characterized in that formed on the one surface of the polyhedron block as a feed. The method according to claim 1, And a coupling pattern formed on the polyhedral block and separated from the first radiation pattern, the second radiation pattern, and the third radiation pattern. The method according to claim 6, The coupling pattern is, Built-in antenna for low frequency band, characterized in that having a ground terminal connected to the ground terminal. The portable terminal provided with the low frequency band built-in antenna characterized by including the low frequency band built-in antenna of any one of Claims 1-7.

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