KR101025970B1 - Antenna for potable terminal and potable terminal having the same - Google Patents

Abstract

An antenna for a portable terminal according to the present invention includes a first radiator pattern; A second radiator pattern electrically connected to the first radiator pattern; And a coupling pattern coupling the flow of current flowing into the second radiator pattern, wherein one end of the first radiator pattern and one end of the second radiator pattern are arranged to be parallel to each other at a predetermined distance apart from each other. Is characteristic. According to the present invention, the portable terminal has a slim and miniaturized structure so that it can be mounted on the portable terminal, and can be independently operated in a multiband including a high frequency band and a low frequency band, and has excellent antenna gain and bandwidth characteristics. Built-in antenna is implemented.

Description

Antenna for portable terminal and portable terminal having same {Antenna for potable terminal and potable terminal having the same}

The present invention relates to an antenna for a portable terminal and a portable terminal having the same, and more particularly, to an antenna for a portable terminal used in a wide area network (WWAN) and a portable terminal having the same.

The mounting of an antenna in a portable terminal (eg UMPC, notebook) requires a very compact structure due to the miniaturization of the portable terminal.

The position of the antenna which is currently considered the most is installed in the frame located on the edge of the LCD screen of the notebook. This location can be easily installed with less interference from users while using the notebook. In addition, the built-in design increases the user's convenience in use than the protruding type.

While most resonant antennas are one-half of the operating frequency, PIFA antennas can operate as one-fourth the operating frequency. This is a possible technique, with one side of the antenna open circuit and the other side short circuited. For this reason, it is widely used as an antenna for portable terminals in UMPC, PDA, and notebook computer.

The PIFA antenna controls the width and length of the patch to determine the operating frequency. In addition, the feeding point is generally used to find the position where the antenna has the smallest reflection loss and use the probe feeding method.

Several techniques have been proposed for dual band use of PIFA antennas, using L-shaped slots, U-shaped slots in patches, and attaching additional metal patches to patches. . The L-shaped slot is disadvantageous in that it is difficult to obtain a single feed point that satisfies all of the dual bands and is not easy to tune. Using the U-shaped slot is not suitable for notebooks that require small size because of the larger patch size.

And the addition of additional metal patches has the disadvantage that the mechanical stability is lowered and an additional process is required.

An object of the present invention is to provide a built-in antenna for a mobile terminal capable of operating independently in a multiband including a high frequency band and a low frequency band, and having excellent antenna gain and bandwidth characteristics.

In addition, an object of the present invention is to provide an antenna for a portable terminal having a slim and miniaturized structure so that it can be mounted on an increasingly small portable terminal.

An antenna for a portable terminal of the present invention includes a first radiator pattern; A second radiator pattern electrically connected to the first radiator pattern; And a coupling pattern for coupling a flow of current flowing into the second radiator pattern, wherein one end of the first radiator pattern and one end of the second radiator pattern are spaced apart from each other and arranged in parallel to each other. to be.

In addition, the other end of the first radiator pattern is preferably formed of a feed portion and the other end of the second radiator pattern is preferably formed of a ground portion.

In addition, the first radiator pattern and the second radiator pattern are formed on the dielectric block, the dielectric block is mounted on the printed circuit board, and the coupling pattern is formed to face the second radiator pattern with the printed circuit board interposed therebetween. desirable.

In addition, the first radiator pattern is preferably formed in the form of meander lines.

According to the present invention has the following effects.

Built-in antenna for portable terminals, which has a slim and miniaturized structure so that it can be mounted on an increasingly smaller portable terminal and can operate independently in a multiband including a high frequency band and a low frequency band, and has excellent antenna gain and bandwidth characteristics. Is implemented.

The present invention will now be described in detail with reference to the accompanying drawings. Here, the repeated description, well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more completely describe 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, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front perspective view for explaining an antenna for a portable terminal according to an embodiment of the present invention, Figure 2 is a rear perspective view for explaining an antenna for a portable terminal according to an embodiment of the present invention, Figure 3 It is a figure which shows the equivalent circuit of 1 or 2 antenna.

An antenna for a portable terminal according to an embodiment of the present invention includes a first radiator pattern, a second radiator pattern, a coupling pattern, a dielectric block, and a printed circuit board.

Here, in order to describe the shapes of the first and second radiator patterns in more detail, the shapes of the dielectric blocks are not shown in the drawings. However, one of ordinary skill in the art may easily infer the shape of the dielectric block through a structure in which the first and second radiator patterns are formed.

Referring to FIG. 1, a radiator pattern 10 formed in a 'b' shape is formed on an upper surface of a printed circuit board 1. The radiator pattern 10 formed in a 'b' shape on the upper surface of the printed circuit board 1 includes a feed part. Thus, when the antenna for the portable terminal of the present invention is mounted on the portable terminal, the 'b' shaped radiator pattern 10 is electrically connected to the feed terminal provided on the main circuit board of the portable terminal.

The radiator pattern 10 is formed in the dielectric block and electrically connected to the '-' radiator pattern 14 formed on the top surface of the dielectric block through the via hole 12 plated or filled with a conductive material.

 The '-'- shaped radiator pattern 14 formed on the top surface of the dielectric block is formed on the dielectric block, and the'-'shaped radiator pattern 22 formed on the bottom surface of the dielectric block through the via hole 20 plated or filled with a conductive material. ) Is electrically connected. The '-' shape of the radiator pattern 22 is electrically connected to the meander line-shaped radiator pattern 28 formed on the upper surface of the dielectric block through the via holes 24 and 25 and the radiator pattern 26 plated or filled with a conductive material. Is connected. By forming a radiator pattern in the shape of a meander line on the upper surface of the dielectric block to realize a long radiation line of the antenna, the one end of the 'first radiator pattern' to be described later and the one end of the 'second radiator pattern' It is easy to arrange so that they overlap each other in parallel. In addition, since the radiation line can be formed long in the limited volume of the dielectric block, the overall size of the antenna can be reduced.

Next, the meander line-shaped radiator pattern 28 is electrically connected to the '-' shaped radiator pattern 32 formed on the bottom surface of the dielectric block through the via hole 30 plated or filled with a conductive material.

One radiation line that extends from the above-described 'A'-shaped radiator pattern 10 to the' -'- shaped radiator pattern 32 will be referred to as a 'first radiator pattern' below. More specifically, the 'first radiator pattern' in FIG. 1 may include a portion of the radiator patterns 10, 26, 28, and 32, the via holes 12, 20, 25, and 30, and the radiator patterns 14 and 22. May be included.

Meanwhile, the '-' shaped radiator pattern 22 formed on the lower surface of the dielectric block is electrically connected to the via holes 24 and 20. The '-' shaped radiator pattern 22 is electrically connected to the 'c' shaped radiator pattern 14 through the via hole 20. In addition, the 'c' shaped radiator pattern 14 is electrically connected to the 'c' shaped radiator pattern 18 through a via hole 16 plated or filled with a conductive material.

The 'c' shaped radiator pattern 18 has a ground portion, and when the antenna for the portable terminal of the present invention is mounted on the portable terminal, the 'c' shaped radiator pattern 18 is attached to the main circuit board of the portable terminal. It is electrically connected to the provided ground terminal.

One radiation line that extends from the aforementioned '-' shaped radiator pattern 22 to the 'c' shaped radiator pattern 18 will be collectively referred to as a 'second radiator pattern'. More specifically, the 'second radiator pattern' in FIG. 1 may include some sections of the radiator patterns 22, 14, and 18, the via holes 20 and 16, and the radiator pattern 14.

As shown in FIG. 1, one end of the 'first radiator pattern' and one end of the 'second radiator pattern' are spaced apart from each other in parallel with each other. In the present invention, as described above, by arranging one end of the 'first radiator pattern' and one end of the 'second radiator pattern' to be spaced apart and overlapping in parallel to each other ('A' region), in the 824 ~ 960MHz band Coupling is induced between the end of the resonant 'first radiator pattern' and the end of the resonant 'second radiator pattern' in the 1710-2170 MHz band. Therefore, it is possible to extend the resonant frequency bandwidth in each band where the 'first radiator pattern' and the 'second radiator pattern' resonate. In this case, the resonance frequency band and the bandwidth to be implemented may be adjusted by adjusting regions (ie, 'A' regions) overlapping in parallel with each other.

Referring to FIG. 2, as shown in region 'B', a coupling pattern 36 is formed on the rear surface of the printed circuit board 1. The coupling pattern 36 is formed to face the 'second radiator pattern' with the printed circuit board 1 interposed therebetween, and is electrically separated from each other. In addition, one end of the coupling pattern 36 is formed as a ground portion. Accordingly, when the antenna for the portable terminal of the present invention is mounted in the portable terminal, the coupling pattern 36 is electrically connected to the ground terminal provided in the main circuit board of the portable terminal.

In the present invention, the coupling pattern 36 is formed to be spaced apart from the 'second radiator pattern' and induces coupling to each other, thereby having a wide bandwidth in a multiband including 824 to 960 MHz and 1710 to 2170 MHz. An improved portable terminal antenna can be implemented.

Meanwhile, in order to effectively induce coupling between the coupling pattern 36 and the 'second radiator pattern', it is preferable to form the printed circuit board 1 so as to face the 'second radiator pattern'. The ring pattern 36 may not be formed only on the rear surface of the printed circuit board 1. The coupling pattern 36 may be formed at a position that may be formed according to a resonance frequency to be implemented. For example, it may be formed on one side of the dielectric block to induce coupling with the 'second radiator pattern'.

4 and 5 are diagrams for explaining the characteristics of the antenna for a portable terminal according to an embodiment of the present invention. 4 is a graph illustrating the standing wave ratio (VWSR) of the antenna of FIG. 1, and FIG. 5 is a table illustrating average gain (Avg. Gain) characteristics of the antenna for each resonance frequency of the antenna of FIG. 1.

For the antenna of FIG. 4, a dielectric block of 42 mm in length, 2 mm in width, and 3.2 mm in height was used. For reference, the most efficient radiating of the power supplied to the antenna is when the standing wave ratio is the smallest, and the frequency thereof becomes the resonance frequency of the antenna.

As shown in FIG. 4, when the standing wave ratio is 6 dB, the relative low frequency band has a bandwidth of about 200 MHz or more, and the high frequency band has a bandwidth of about 500 MHz or more.

Referring to FIG. 5, it can be seen that the average gain of the antenna is less than 4 dB except for the 869 MHz and 915 MHz frequency bands. Although there is a slight difference between frequency bands, in general, if the average gain of each frequency band is 4 dB or less, a satisfactory internal antenna for a portable terminal may be implemented.

As described above, the antenna matching is improved compared to the conventional antenna using the antenna according to the present invention, and it can be confirmed that an antenna having a wide bandwidth in the multi band is implemented.

The present invention can be embodied as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media may include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage. Also included are those implemented in the form of carrier waves (eg, transmission over the Internet). The computer readable recording medium can also be distributed over network coupled systems so that the computer readable code is stored and executed in a distributed fashion.

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a front perspective view for explaining an antenna for a portable terminal according to an embodiment of the present invention.

2 is a rear perspective view for explaining an antenna for a portable terminal according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an equivalent circuit of the antenna illustrated in FIG. 1.

4 is a view for explaining the characteristics of the antenna for a portable terminal according to an embodiment of the present invention.

5 is a view for explaining the characteristics of the antenna for a portable terminal according to an embodiment of the present invention.

Claims (5)

A first radiator pattern; A second radiator pattern electrically connected to the first radiator pattern; And Formed to face the second radiator pattern with a printed circuit board interposed therebetween to couple the flow of current flowing into the second radiator pattern, and to be electrically separated from the first radiator pattern and the second radiator pattern With a coupling pattern, One end of the first radiator pattern and one end of the second radiator pattern are arranged to be spaced apart and parallel to each other, and one end of the first radiator pattern and one end of the second radiator pattern face in opposite directions. An antenna for a portable terminal, characterized in that arranged to be. The method according to claim 1, One end of the first radiator pattern is formed of a feeder, and one end of the second radiator pattern and the coupling pattern is formed of a grounding portion antenna. The method according to claim 1, And the first radiator pattern and the second radiator pattern are formed on a dielectric block, and the dielectric block is mounted on a printed circuit board. The method according to claim 1, The first radiator pattern is a antenna for a portable terminal, characterized in that formed in the shape of a meander line. An antenna for a portable terminal according to any one of claims 1 to 4; A feed end to which the first radiator pattern of the antenna for the portable terminal can be electrically connected; And a ground terminal to which the second radiator pattern and the coupling pattern are electrically connected.

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