KR20100085294A - Multi band antenna for potable terminal and potable terminal having the same - Google Patents

Abstract

PURPOSE: A multi band antenna for a potable terminal and the potable terminal having the same are provided to improve the property of bandwidth and antenna gain by being operated in multiband respectively. CONSTITUTION: A first antenna unit comprises a first radiator pattern, a second radiator pattern, and a coupling pattern. A second radiator pattern is electrically connected to the first radiator pattern. The coupling pattern couples the flow of the current flowing into the second radiator pattern. The second antenna unit comprises a third radiator pattern. The third radiator pattern is electrically connected to the second radiator pattern. The end of the first radiator pattern is overlapped with the end of the second radiator pattern.

Description

Multi-band antenna for portable terminal and portable terminal having same {Multi band antenna for potable terminal and potable terminal having the same}

The present invention relates to a multi-band antenna for a portable terminal and a portable terminal having the same, and more particularly, to a built-in antenna for a portable terminal having a miniaturized structure and usable in a multi-band and a portable terminal having the same.

The mounting of antennas in portable terminals (e.g., UMPCs, laptops, PDAs, netbooks, etc.) requires a very compact structure due to the miniaturization of portable terminals.

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 1/2 wavelength of the operating frequency, PIFA antennas can operate as 1/4 wavelength of 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 feed point generally uses a probe feeding method by finding a position where the antenna has the least reflection loss.

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. The use of U-shaped slots is not suitable for portable terminals (eg, laptops) 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.

On the other hand, the portable terminal is designed to have a smaller structure for the convenience of the user, and therefore, an antenna built in the terminal is also required to have a built-in antenna having a miniaturized structure. In addition, due to the diversification of wireless communication services, there is a demand for the development of an antenna capable of satisfying all the various frequency bands currently serviced by one antenna (eg, WWAN, WLAN, GPS, UWB, Wimax, etc.).

An object of the present invention is to provide a built-in antenna for a mobile terminal which can operate independently in multiple bands and has excellent characteristics of gain and bandwidth of the antenna. 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 a portable terminal which is increasingly miniaturized.

The antenna for a portable terminal according to the present invention includes a coupling pattern for coupling a first radiator pattern, a second radiator pattern electrically connected to the first radiator pattern, and a flow of current flowing into the second radiator pattern. A first antenna unit provided; And a second antenna unit having a third radiator pattern electrically connected to the second radiator pattern, wherein the end of the first radiator pattern and the end of the second radiator pattern are arranged to be parallel to each other at a predetermined distance apart from each other. It is characterized by that.

In particular, an end of the first radiator pattern is formed of a feed part, and an end of the second radiator pattern and the coupling pattern is formed of a ground part.

In addition, an end of the third radiator pattern may be electrically connected to the ground portion.

In addition, the first antenna portion is characterized in that it is formed to exhibit the frequency characteristics of the WWAN band.

In addition, the second antenna unit is characterized in that it is formed to exhibit any one of the frequency characteristics of the WLAN band, GPS band, and Wimax band.

The first radiator pattern and the second radiator pattern are formed on a dielectric block, the dielectric block is mounted on a printed circuit board, and the coupling pattern faces the second radiator pattern with a printed circuit board interposed therebetween. Characterized in that it is formed to see.

The third radiator pattern may be formed on the printed circuit board.

The apparatus may further include a third antenna unit on which the fourth radiator pattern is formed.

In addition, the third antenna unit is characterized in that it is formed to exhibit the frequency characteristics of any one of the WLAN band, GPS band, and Wimax band.

According to the present invention has the following effects.

A multi-band internal antenna for a portable terminal has a slim and miniaturized structure, which can be independently operated in multiple bands, and has excellent antenna gain and bandwidth characteristics so that the portable terminal can be mounted in an increasingly small portable terminal.

Hereinafter, the present invention will 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 a portable terminal antenna according to an embodiment of the present invention, Figure 2 is a bottom perspective view for explaining a portable terminal antenna according to an embodiment of the present invention, Figure 3 FIG. 1 is a diagram illustrating an equivalent circuit of the first antenna part M region illustrated in FIG. 1 or FIG. 2.

A multi-band antenna for a mobile terminal according to an embodiment of the present invention includes a first antenna part and a second antenna part. Here, the first antenna part refers to the antenna part corresponding to the 'M' area of FIG. 1, and the second antenna part refers to the antenna part corresponding to the 'I' area.

Hereinafter, the multi-band antenna for the mobile terminal according to an embodiment of the present invention will be described by dividing the first antenna unit and the second antenna unit, respectively.

First, the first antenna unit 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. Here, in order to describe in more detail the shapes of the first and second radiator patterns formed on the first antenna portion, 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 feeder is formed at the end of the radiator pattern 10 formed in a 'b' shape on the upper surface of the printed circuit board (1). Accordingly, when the antenna for a portable terminal according to the present invention is mounted on the portable terminal, the radiator pattern 10 having a 'b' shape is electrically connected to a feed terminal (not shown) provided in the main circuit board of the portable terminal.

The radiator pattern 10 is electrically connected to the 'c' shaped radiator pattern 14 formed on the upper 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 electrically connected to 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. do. 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, the radiating line of the antenna is realized long, and one end of the first radiator pattern to be described later and one side of the second radiator pattern. It is easy to arrange the ends so that they overlap each other in parallel with a predetermined distance apart. 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'.

More specifically, the 'first radiator pattern' in FIG. 1 is a part of the radiator patterns 10, 26, 28, 32, via holes 12, 20, 24, 25, 30 and the radiator patterns 14, 22. A section 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. The 'c' shaped radiator pattern 14 is electrically connected to the inverted 'c' shaped radiator pattern 18 through a via hole 16 plated or filled with a conductive material.

The 'c' shaped radiator pattern 18 is electrically connected to a ground 46 formed at the bottom of the printed circuit board 1 through a via hole 48 whose end is plated or filled with a conductive material (see FIG. 2). ). Therefore, when the multi-band antenna according to the embodiment of the present invention is mounted on the portable terminal, the inverted 'c'-shaped radiator pattern 18 is electrically connected to the ground terminal (not shown) provided in the main circuit board of the portable terminal. Connected.

One radiation line that extends from the aforementioned '-' shaped radiator pattern 22 to the inverted 'c' shaped radiator pattern 18 will be 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 arranged to be parallel to each other at a predetermined distance from each other in the region 'A'.

In the present invention, by arranging one end of the 'first radiator pattern' and one end of the 'second radiator pattern' so as to overlap each other in parallel with each other at a predetermined distance ('A' region), resonating in a predetermined low frequency band Coupling is induced between the end of the 'first radiator pattern' and the end of the 'second radiator pattern' resonating in a predetermined high frequency band. Through the above-described structure, the resonance frequency bandwidth can be extended in each band where the 'first radiator pattern' and the 'second radiator pattern' resonate. At this time, it is a matter of course that the resonance frequency band and the bandwidth to be implemented by adjusting the overlapping area (ie, 'A' area) in parallel with each other can be adjusted.

Referring to FIG. 2, a coupling pattern 36 is formed on the bottom of the printed circuit board 1 to induce mutual coupling with the 'second radiator pattern'. In this case, the coupling pattern 36 is formed to face the 'second radiator pattern' with the printed circuit board 1 interposed therebetween.

The ground portion 46 is formed at the end of the coupling pattern 36. In this case, the ground part 46 formed on the coupling pattern 36 may be electrically connected to the 'second radiator pattern' formed on the upper surface of the printed circuit board 1 through the via hole 48 that is plated or filled with a conductive material. (See 'C' region in FIG. 1).

Accordingly, when the multi-band antenna according to the present invention is mounted in the portable terminal, the coupling pattern 36 is electrically connected to a ground terminal (not shown) provided in the main circuit board of the portable terminal.

Through the above-described structure, that is, the coupling pattern 36 is formed to be spaced apart from the 'second radiator pattern' by a predetermined distance to induce mutual coupling, and includes a multiple including approximately 824 ~ 960MHz and 1710 ~ 2170MHz It is possible to implement an antenna having a wide bandwidth and improved characteristics in a band.

Meanwhile, in order to effectively induce coupling between the coupling pattern 36 and the 'second radiator pattern', the coupling pattern 36 and the 'second radiator pattern' are disposed with each other with the printed circuit board 1 interposed therebetween. It is preferable to form so as to face. However, as shown in FIG. 2, the coupling pattern 36 may not be formed only on the bottom surface of the printed circuit board 1. The coupling pattern 36 may have a different position depending on a resonance frequency to be implemented. For example, the coupling pattern 36 may form a coupling pattern on one side of the printed circuit board 1 on which the 'second radiator pattern' is formed. Coupling with the two radiator pattern 'may be induced.

Next, the second antenna unit includes a third radiator pattern electrically connected to the second radiator pattern of the first antenna unit.

Referring to FIG. 1, a 'c' shaped radiator pattern 42 is formed on an upper surface of one side of the printed circuit board 1, and a 'b' shaped radiator pattern electrically connected to a central portion of the radiator pattern 42. 40 is formed. The radiator pattern 42 having a 'c' shape and the radiator pattern 40 having a 'b' shape are electrically connected to each other to form a single radiation line, and resonate at a predetermined frequency band. Hereinafter, this will be referred to as a 'third radiator pattern'. In the center portion of the third radiator pattern, a feed portion 43 is electrically connected to a feed end (not shown) of the main circuit board of the portable terminal. The 'third radiator pattern' is electrically connected to the 'second radiator pattern' of the first antenna unit through the conductive pattern 45. More specifically, the end of the radiator pattern 40 having a 'b' shape is electrically connected to the end of the 'second radiator pattern' of the first antenna portion. Here, the end of the 'second radiator pattern' is connected to the ground portion 46 formed on the bottom surface of the printed circuit board 1 through at least one via hole 48, so that the 'third radiator pattern' is also printed. It is electrically connected to the ground portion 46 formed on the bottom surface of the circuit board (1).

On the other hand, the shape of the third radiator pattern is not limited to the shape shown in Figure 1, it is possible to adjust the resonance frequency by changing the length, thickness, and shape of the pattern according to the resonance frequency to be implemented. For example, it is possible to change the shape of the pattern to exhibit frequency characteristics in any one of the WLAN band, the GPS band, and the Wimax band.

Hereinafter, the characteristics of the antenna for a portable terminal according to an embodiment of the present invention will be described by dividing it into a first antenna unit and a second antenna unit. For reference, the resources of the portable terminal antenna used in FIGS. 4 to 7 are 85 mm long, 7 mm wide, and 4 mm high.

4 and 5 are diagrams for explaining the characteristics of the first antenna unit in the antenna for a portable terminal according to an embodiment of the present invention. More specifically, FIG. 4 is a graph showing the standing wave ratio (VWSR) of the first antenna unit, and FIG. 5 is a characteristic (Avg. Gain, Peak gain) in the resonance frequency band of the first antenna unit. , Efficiency].

Referring to the point where the standing wave ratio is 6 dB in FIG. 4, it can be seen that the low frequency band (about 700 MHz to 1000 MHz band) of FIG. 4 has a bandwidth of about 150 MHz, and about 400 MHz in the high frequency band (about 1600 MHz to 2300 MHz band). It can be seen that the bandwidth has a degree.

Referring to FIG. 5, it can be seen that the average gain of the antenna is 4.5 dB or less in the resonant frequency band except for the 960 MHz band. Although the frequency bands are slightly different, in general, if the average gain of each resonant frequency band is less than 4.5dB, satisfactory antennas may be implemented. 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 is the resonance frequency of the antenna. Referring to FIG. 5, the smaller the standing wave ratio for each frequency band, the higher the efficiency appears.

Accordingly, it can be seen that the first antenna unit satisfies impedance matching and operates as an antenna having a wide bandwidth in the WWAN band.

6 and 7 are views for explaining the characteristics of the second antenna unit in the antenna for a portable terminal according to an embodiment of the present invention. More specifically, FIG. 6 is a graph showing the standing wave ratio (VWSR) of the second antenna portion, and FIG. 7 is a characteristic (Avg. Gain and Peak gain) in the resonance frequency band of the second antenna portion. , Efficiency].

Referring to the point where the standing wave ratio is 6 dB in FIG. 6, it can be seen that the low frequency band (about 2.2 GHz to 2.8 GHz) of FIG. 6 has a bandwidth of about 300 MHz, and a high frequency band (about 2.2 GHz to 2.8 GHz). Band) has a bandwidth of about 800 MHz.

Referring to Figure 7, it can be seen that the average gain of the antenna in the resonant frequency band is less than 4.5dB. Although the frequency bands are slightly different, in general, if the average gain of each resonant frequency band is less than 4.5dB, satisfactory antennas may be implemented.

Accordingly, it can be seen that the second antenna unit operates as an antenna having a wide bandwidth in a WLAN band that satisfies impedance matching and satisfies IEEE 802.11b.

4 to 7, the antenna for a mobile terminal according to an embodiment of the present invention operates independently in multiple bands (ie, including a WWAN band and a WLAN band) through a first antenna unit and a second antenna unit. It is possible to confirm that the built-in antenna has been implemented with excellent antenna gain and bandwidth characteristics.

On the other hand, the main feature of the present invention is to combine the one or more antenna units having various frequency characteristics to enable independent operation in multiple bands to have a miniaturized structure, to effectively use the space inside the terminal It is. Therefore, it is a matter of course that the shape of the third radiator pattern in the second antenna unit may vary depending on the resonance frequency to be implemented.

That is, in the first embodiment of the present invention, the second antenna portion has a frequency characteristic in the WLAN band due to the radiator pattern structure shown in FIG. 1, but the shape of the third radiator pattern is changed to change the shape of the GPS band or The second antenna unit may be implemented to have frequency characteristics in the Wimax band. Those skilled in the art will be able to implement the second antenna portion to have frequency characteristics in the GPS band or the Wimax band by using a variety of known emitter patterns to achieve this.

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

The antenna for a portable terminal according to the second embodiment of the present invention includes a first antenna part, a second antenna part, and a third antenna part. Here, the first antenna part refers to the antenna part corresponding to the 'M' area of FIG. 1, and the second antenna part refers to the antenna part corresponding to the 'I' area. The third antenna part refers to the antenna part corresponding to the 'K' area. Hereinafter, the same components as in the first embodiment (Figs. 1 and 2) are denoted by the same reference numerals, and description thereof will be omitted.

On the upper surface of one side of the printed circuit board 1, a 'c' shaped radiator pattern 55 is formed, and a 'b' shaped radiator pattern 53 electrically connected to a central portion of the radiator pattern 55 is formed. . The radiator pattern 55 having a 'c' shape and the radiator pattern 53 having a 'b' shape are electrically connected to each other to form a single radiation line and resonate at a predetermined frequency band. Hereinafter, this will be referred to as a 'fourth radiator pattern'. In the center portion of the fourth radiator pattern, the feed portion 53 is electrically connected to a feed end (not shown) of the main circuit board of the portable terminal.

In addition, the fourth radiator pattern is electrically formed with a ground portion (not shown) formed on the bottom surface of the printed circuit board through the via hole 51, the inside of which is plated or filled with a conductive material. In this case, the ground portion formed on the bottom surface of the printed circuit board 1 electrically connected to the fourth radiator pattern through the via hole 51 is formed separately from the ground portion 46 shown in FIG. 2.

On the other hand, the shape of the fourth radiator pattern is not limited to the shape shown in Figure 8, it is possible to adjust the resonant frequency by changing the length, thickness, and shape of the pattern according to the resonant frequency to be implemented. For example, it is possible to change the shape of the pattern to exhibit frequency characteristics in any one of the WLAN band, the GPS band, and the Wimax band. In this case, it is preferable to form the fourth radiator pattern so that each antenna unit does not overlap with the operating frequency characteristic of the second antenna unit so that the antenna unit can operate independently in the multi-band.

According to the present invention, since the shapes of the third radiator pattern formed on the second antenna part and the fourth radiator pattern formed on the third antenna part can be independently changed, a multi-band antenna satisfying various frequency bands is realized. It is easy to do In addition, by combining the at least one antenna unit capable of adjusting the resonant frequency to have a miniaturized structure, inefficient space utilization caused by installing a plurality of conventional antennas individually to receive the frequency of the corresponding band. It can be minimized, and the space inside the portable terminal can be effectively used.

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 a portable terminal antenna according to an embodiment of the present invention.

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

3 is a diagram illustrating an equivalent circuit of the first antenna unit illustrated in FIGS. 1 and 2.

4 and 5 are diagrams for explaining the characteristics of the first antenna unit in the antenna for a portable terminal according to an embodiment of the present invention.

6 and 7 are views for explaining the characteristics of the second antenna unit in the antenna for a portable terminal according to an embodiment of the present invention.

8 is a front perspective view illustrating an antenna for a portable terminal according to an exemplary embodiment of the present invention.

Claims (10)

A first antenna unit having a first radiator pattern, a second radiator pattern electrically connected to the first radiator pattern, and a coupling pattern coupling a flow of current flowing into the second radiator pattern; And A second antenna unit having a third radiator pattern electrically connected to the second radiator pattern, And an end of the first radiator pattern and an end of the second radiator pattern are arranged to overlap in parallel with each other at a predetermined distance. The method according to claim 1, An end of the first radiator pattern is formed of a feeder, and an end of the second radiator pattern and the coupling pattern is formed of a ground part. The method according to claim 2, The end of the third radiator pattern is an antenna for a portable terminal, characterized in that electrically connected to the ground. The method according to claim 1, The first antenna unit is a antenna for a portable terminal, characterized in that formed to exhibit the frequency characteristics of the WWAN band. The method according to claim 1, The second antenna unit is an antenna for a portable terminal, characterized in that formed to exhibit the frequency characteristics of any one of the WLAN band, GPS band, and Wimax band. The method according to claim 1, The first radiator pattern and the second radiator pattern are formed on a dielectric block, the dielectric block is mounted on a printed circuit board, and the coupling pattern is formed to face the second radiator pattern with a printed circuit board interposed therebetween. A portable terminal antenna, characterized in that. The method according to claim 6, And the third radiator pattern is formed on the printed circuit board. The method according to claim 1, And a third antenna unit having a fourth radiator pattern formed thereon. The method according to claim 8, And the third antenna unit is configured to display frequency characteristics of any one of a WLAN band, a GPS band, and a Wimax band. The antenna for a portable terminal of any one of Claims 1-7; A feed end to which the first antenna part and the second antenna part of the antenna for the portable terminal can be electrically connected; And And a ground terminal to which the first antenna portion and the second antenna portion are electrically connected.

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