KR100839688B1 - Internal antenna - Google Patents

Abstract

An internal antenna is provided to widen a desired resonant frequency easily by having a resonant frequency of a wide-band. An internal antenna includes a first dielectric block(200), and a second dielectric block(210). A first radiator pattern is formed on the first dielectric block. A second radiator pattern(230) is formed on the second dielectric block. The second dielectric block is horizontally coupled to an upper plane of the first dielectric block. An end of the first radiator pattern is electrically coupled to an end of the second radiator pattern. A bottom plane of the second dielectric block is coupled to an upper plane of the first dielectric block. An area of the bottom plane of the second dielectric block is larger than an area of an upper plane of the first dielectric block.

Description

 Internal antenna

FIG. 1A is an enlarged plan view of a structural diagram and a part for explaining a structure in which a conventional SMT type of built-in antenna is mounted on a main board of a mobile terminal, and FIG. 1B is a cross-sectional view of FIG. 1A.

Figure 2a is an exploded perspective view for explaining the built-in antenna according to the first embodiment of the present invention, Figure 2b is a coupling state diagram of Figure 2a.

Figure 3a is an exploded perspective view for explaining the built-in antenna according to a second embodiment of the present invention, Figure 3b is a coupling state diagram of Figure 3a.

FIG. 4A is an exploded perspective view illustrating the internal antenna according to the third exemplary embodiment of the present invention, and FIG. 4B is a coupled state diagram of FIG. 4A.

5 is a perspective view illustrating a built-in antenna according to a fourth embodiment of the present invention.

6 is a perspective view illustrating a built-in antenna according to a fifth embodiment of the present invention.

7 is a perspective view illustrating a built-in antenna according to a sixth embodiment of the present invention.

8 is a perspective view illustrating a built-in antenna according to a seventh embodiment of the present invention.

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

200: first dielectric block 210: second dielectric block

220: first radiation pattern 230: second radiation pattern

240: via hole 250: feeder

260 connection portion 270 grounding portion

The present invention relates to a built-in antenna of a mobile communication terminal, and more particularly, to a built-in antenna of a mobile communication terminal that can be used in a multimedia portable communication terminal such as a personal mobile phone terminal to maximize space utilization.

At present, due to the rapid development of communication technology, various kinds of mobile communication services such as cellular, PCS and PHS are being implemented. Mobile communication terminals are being developed with the aim of miniaturization, multifunction, light weight, and low power. This trend is equally required in the antenna, which is one of the main components of the mobile communication terminal.

The antenna in the mobile communication terminal plays the role of a key component to determine the call quality and the beginning and end of the signal input and output.

Antennas for mobile communication terminals can be largely divided into internal and external types. The external antenna currently used generally is installed to protrude outside the mobile communication terminal, and is applied in various forms.

These antennas have the advantage of obtaining a high gain, but due to the omni-directional SAR characteristics are not good. In addition, due to its shape protruding to the outside, the problem of spoiling the appearance of the terminal and taking up a lot of volume has occurred.

In order to solve the above problems, it is possible to miniaturize the antenna by increasing the electrical length of the antenna radiating element by using a high-k dielectric as the whole base of the antenna, and the adoption of a built-in antenna that can be mounted on the printed circuit board inside the terminal. It's growing.

However, in general, in the case of an antenna mainly used for wireless communication or the like, it basically has a characteristic of resonating at λ / 2 and λ / 4 lengths. Due to the development of technology, the demand for miniaturization of antennas, which are essential for wireless communication, is increasing, but due to the characteristics of antennas resonating at λ / 2 and λ / 4 lengths of the use frequency, Miniaturization has its limits. Common methods for miniaturizing antennas include increasing the electrical length of the antenna using ferroelectrics and increasing the physical length of the antenna by bending or dividing the antenna into various shapes for the same volume. However, since the area that can be formed on the dielectric surface is limited, it is not easy to design a multiband antenna such as a dual band or triple band, and there are many limitations in miniaturization of an embedded antenna. There is a problem.

FIG. 1A is an enlarged plan view showing a structure and a part of a conventional SMT type built-in antenna mounted on a main board of a mobile terminal, and FIG. 1B is a cross-sectional view of FIG. 1A.

As shown in Figure 1a and Figure 1b, the conventional SMT type of built-in antenna 100 is to be mounted on one end on the motherboard 110 to increase the efficiency. In general, in order to mount the built-in antenna 100 of the SMT type to maintain the minimum line (Clearance, A) and the outer line of the main board 110 to protect the built-in antenna 100, the case of the terminal The minimum spacing (B) should be formed between the 120 and the main board 110. If the minimum spacing A + B is not formed, scratches may occur in the built-in antenna 100 during disassembly and assembly of the case 120, and the antenna may be easily damaged. When the antenna is impacted from the outside, the antenna may be damaged. It can be easily damaged.

Therefore, when designing the mobile terminal structure, the built-in antenna 100 is typically mounted at a distance of at least 0.5 mm from the outer line of the main board 110, and the case 120 and the main board 110 of the mobile terminal. The liver is designed with a minimum clearance of 0.5mm to 1mm. This is not limited to the built-in antenna 100, but applies to all SMT type chips mounted on the main board 110 of the mobile terminal. In addition, the SMT type internal antenna 100 mounted on the main board 110 is generally adjacent to and spaced apart from other chips mounted on the main board 110 to form a no ground (NO-GROUND, 130). It is mounted at a distance. For this reason, a dead space is generated between the mobile terminal case 120 and other adjacent chips and a built-in antenna of the SMT type.

The present invention utilizes the dead space on the main board of the mobile communication terminal to the maximum through the SMT type antenna having a flat plate-shaped extension, has a high radiation gain characteristics, built-in type that meets the trend of miniaturization of the mobile communication terminal The purpose is to provide an antenna.

According to an aspect of the present invention, there is provided a built-in antenna of a mobile terminal, comprising: a first dielectric block having a first radiator pattern; And a second dielectric pattern having a second radiator pattern, the second dielectric block horizontally coupled to an upper surface of the first dielectric block, wherein one end of the first radiator pattern and one end of the second radiator pattern are electrically connected to each other. The area of the bottom surface of the second dielectric block coupled to the top surface of the first dielectric block is larger than the area of the top surface of the first dielectric block.

In particular, the second dielectric block is preferably a flat flexible printed circuit board.

In addition, the second dielectric block is preferably formed by extending in at least one of the up, down, left, and right directions of the upper surface of the first dielectric block.

The present invention made as described above will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same configurations as the prior art, and repeated descriptions, well-known functions that may unnecessarily obscure the subject matter of the present invention, and detailed descriptions of the configurations 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.

(First embodiment)

Figure 2a is an exploded perspective view for explaining the built-in antenna according to the first embodiment of the present invention, Figure 2b is a coupling state diagram of Figure 2a.

The built-in antenna of the first embodiment includes a first dielectric block 200 and a second dielectric block 210.

As shown in FIG. 2A, a first radiator pattern 220a having a meander shape (line width and line spacing may be the same or different) is printed on an upper surface of the first dielectric block 200. On the bottom of the first dielectric block 200, a feed part 250a is formed at one end of the first dielectric block 200 as a conductive pad. The feed part 250a and the first radiator pattern 220a are electrically connected to each other through a via hole 240 having an inner surface printed or filled with a conductive material. The feed part 250a is configured to have a predetermined size on the surface of the dielectric block 200.

A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 210, and the second dielectric block 210 is formed of a flexible printed circuit board (FPCB) to form a case 120. The interference caused by the narrowing of the second dielectric block 210 and the impact from the outside can be minimized. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220b opposite thereto. Therefore, a predetermined radiation line from the first radiator pattern 220b to the second radiator pattern 230 is formed. In this case, an area of the bottom surface of the second dielectric block 210 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the adjacent outer case and other adjacent chips (not shown). It should be larger than the area of the top surface of the dielectric block 200. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

The second dielectric pattern 230 formed on the bottom of the second dielectric block 210 may have a first dielectric such that coupling with the first radiator pattern 220 formed on the top surface of the first dielectric block 200 does not occur. It should be formed on the lower surface of the second dielectric block 210 within a range exceeding the area of the upper surface of the block 200.

In FIGS. 2A and 2B, the second radiator pattern 230 is formed only on the bottom surface of the second dielectric block 210, but the second radiator pattern (up to the upper surface of the second dielectric block 210 according to the resonance frequency to be implemented) 230 may be formed.

(Second embodiment)

Figure 3a is an exploded perspective view for explaining the built-in antenna having an extension in accordance with a second embodiment of the present invention, Figure 3b is a coupled state of Figure 3a.

The built-in antenna of the second embodiment includes a first dielectric block 200 and a second dielectric block 210.

As shown in FIG. 3A, the first radiator pattern 220b is formed to be spirally wound in a helical form in the first dielectric block 200.

Feeding portions 250b and connecting portions 260 made of a conductive material are formed at both ends of the first dielectric block 200, and the feeding portions 250b and the connecting portions 260 are respectively one side of the first radiator pattern 220b. It is composed of a configuration having a predetermined size on the surface of the first dielectric block 200 is electrically connected to the end and the other end.

A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 210, and the second dielectric block 210 is formed of a flexible printed circuit board to form the outer case 120 and the second dielectric block 210. Due to the narrowing of the gaps, it is possible to minimize the interference and the impact from the outside. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220 opposite thereto. Therefore, a predetermined radiation line from the first radiator pattern 220 to the second radiator pattern 230 is formed. At this time, the area of the bottom surface of the second dielectric block 210 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the outer case 100 and other adjacent chips, but the first dielectric block 200 ) It should be larger than the area of the upper surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

3A and 3B, although the second radiator pattern is formed only on the bottom surface of the second dielectric block 210, the second radiator pattern 230 may be extended to the top surface of the second dielectric block 210 according to the resonance frequency to be implemented. It may be formed.

(Third Embodiment)

Figure 4a is an exploded perspective view for explaining the built-in antenna having an extension in accordance with a third embodiment of the present invention, Figure 4b is a combined state of Figure 4a.

The built-in antenna according to the present invention includes a first dielectric block 200 and a second dielectric block 210.

As shown in FIG. 4A, a first radiator pattern 220c is formed on an upper surface of the first dielectric block 200. The ground portion 270 is formed at one end of the bottom surface of the first dielectric block 200, and the feeder 250c is formed on the bottom surface of the first dielectric block 200 at a predetermined distance from the ground portion 270. do. The grounding part 270 and the power feeding part 250c are electrically connected to the first radiator pattern 220c through the via holes 240a and 240b having inner surfaces printed or filled with a conductive material, respectively.

A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 210, and the second dielectric block 210 is formed of a flexible printed circuit board to form the outer case 120 and the second dielectric block 210. Due to the narrowing of the gaps, it is possible to minimize the interference and the impact from the outside. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220c opposite thereto. Therefore, a predetermined radiation line from the first radiator pattern 220c to the second radiator pattern 230 is formed. At this time, the area of the bottom surface of the second dielectric block 210 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the adjacent outer case 100 and other adjacent chips, but the first dielectric block (200) It should be larger than the area of the top surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

In FIGS. 2A and 2B, the second radiator pattern 230 is formed only on the bottom surface of the second dielectric block 210, but the second radiator pattern (up to the upper surface of the second dielectric block 210 according to the resonance frequency to be implemented) 230 may be formed.

(Example 4)

5 is a perspective view illustrating a built-in antenna according to a fourth embodiment of the present invention.

The built-in antenna of the fourth embodiment includes a first dielectric block 200 and a second dielectric block 500.

The first dielectric block 200 in this embodiment can be applied to any one of the first dielectric blocks 200 in the first to third embodiments described above.

As shown in FIG. 5, a second radiator pattern 230 is formed on the bottom of the second dielectric block 500. The second dielectric block 500 is horizontally coupled to the top surface of the first dielectric block 200, and both sides of the second dielectric block 500 exceed the short side length of the first dielectric block 200 in a short side direction with respect to the top surface of the first dielectric block 200. It is formed in two sides extended form. A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 500, and the second dielectric block 500 is formed of a flexible printed circuit board so that the adjacent outer case 120 and other adjacent chips ( Not shown) to minimize the interference caused by the gap between the second dielectric block 500 and the impact from the outside. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220a to 220c opposite thereto. Therefore, a predetermined radiation line is formed from the first radiator pattern to the second radiator pattern 230. At this time, the area of the bottom surface of the second dielectric block 500 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the adjacent outer case 100 and other adjacent chips, but the first dielectric block (200) It should be larger than the area of the top surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

Meanwhile, the second radiator pattern 230 may not be formed only on the bottom surface of the second dielectric block 500. The second radiator pattern 230 may be formed on the top surface of the second dielectric block 500 according to a resonance frequency to be implemented. ) May be formed.

(Example 5)

6 is a perspective view illustrating a built-in antenna according to a fifth embodiment of the present invention.

The built-in antenna of the fifth embodiment includes a first dielectric block 200 and a second dielectric block 600.

The first dielectric block 200 in this embodiment can be applied to any one of the first dielectric blocks 200 in the first to third embodiments described above.

As shown in FIG. 6, the second dielectric block 600 is horizontally coupled to the top surface of the first dielectric block 200, and the first dielectric block 200 in the longitudinal direction with respect to the top surface of the first dielectric block 200. It is formed in a form extending in two sides on both sides exceeding the long side length. A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 600, and the second dielectric block 600 is formed of a flexible printed circuit board to be adjacent to the adjacent outer case 120 and other adjacent chips. The interference caused by the narrowing of the second dielectric block 600 and the impact from the outside are minimized. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220a to 220c opposite thereto. Therefore, a predetermined radiation line is formed from the first radiator pattern to the second radiator pattern 230. At this time, the area of the bottom surface of the second dielectric block 600 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the outer case 100 and other adjacent chips, but the first dielectric block 200 ) It should be larger than the area of the upper surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

Meanwhile, the second radiator pattern may not be formed only on the bottom surface of the second dielectric block 600, and the second radiator pattern 230 may be formed on the top surface of the second dielectric block 600 according to the resonance frequency to be implemented. May be

(Sixth Embodiment)

7 is a perspective view illustrating a built-in antenna according to a sixth embodiment of the present invention.

The built-in antenna according to the present invention includes a first dielectric block 200 and a second dielectric block 700.

As shown in FIG. 7, the second dielectric block 700 is horizontally coupled to the top surface of the first dielectric block 200. The length of the first dielectric block 200 is formed to extend in three sides beyond the short side length and long side length of the first dielectric block 200 in the short and long side directions. A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 700, and the second dielectric block 700 is formed of a flexible printed circuit board to be adjacent to the adjacent outer case 120 and other adjacent chips. The interference caused by the narrowing of the gap between the second dielectric blocks 700 and the impact from the outside are minimized. One end of the second radiator pattern 230 is electrically connected to one end of the first radiator pattern 220a to 220c opposite thereto. Therefore, a predetermined radiation line is formed from the first radiator pattern to the second radiator pattern 230. At this time, the area of the bottom surface of the second dielectric block 700 coupled with the top surface of the first dielectric block 200 forms a predetermined distance from the outer case 100 and other adjacent chips, but the first dielectric block 200 ) It should be larger than the area of the upper surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

Meanwhile, the second radiator pattern 230 may not be formed only on the bottom surface of the second dielectric block 700. The second radiator pattern 230 may be formed on the top surface of the second dielectric block 700 according to a resonance frequency to be implemented. ) May be formed.

(Example 7)

8 is a perspective view illustrating a built-in antenna according to a seventh embodiment of the present invention.

The built-in antenna according to the present invention includes a first dielectric block 200 and a second dielectric block 800.

As shown in FIG. 8, the second dielectric block 800 is horizontally coupled to the top surface of the first dielectric block 200, and the first dielectric block is shorter and longer than the top surface of the first dielectric block 200. It is a four-sided form extending beyond the short side and long side of 200. A second radiator pattern 230 is formed on a bottom surface of the second dielectric block 800, and the second dielectric block 800 is formed of a flexible printed circuit board so that the adjacent outer case 120 and other adjacent chips are formed. And the gap between the second dielectric block 800 is narrowed to minimize the interference and the impact from the outside. One end of the second radiator pattern 230 is soldered to one end of the first radiator pattern 220a to 220c opposite thereto and electrically connected thereto. Therefore, a predetermined radiation line is formed from the first radiator pattern to the second radiator pattern 230. At this time, the area of the bottom surface of the second dielectric block 800 coupled to the top surface of the first dielectric block 200 forms a predetermined distance from the outer case 100 and other adjacent chips, but the first dielectric block 200 ) It should be larger than the area of the upper surface. When the area of the bottom surface of the second dielectric block 210 is larger than the area of the top surface of the first dielectric block 200, it is possible to secure a volume capable of sufficiently implementing a desired electrical length, and thus, the second dielectric block 210. This is because the radiation gain characteristics of the antenna can be improved by implementing the desired electrical length on the antenna.

Meanwhile, the second radiator pattern 230 may not be formed only on the bottom surface of the second dielectric block 800, and the second radiator pattern 230 may be formed on the top surface of the second dielectric block 800 according to a resonance frequency to be implemented. ) May be formed.

In the above description, the shape of the second dielectric blocks 210 and 500 to 800 according to the embodiment of the present invention is not limited to the shape of the second dielectric blocks 210 and 500 to 800 in FIGS. 2A to 8. The second dielectric blocks 210 and 500 to 800 are formed at a predetermined distance from the outer case and other adjacent chips, and the area of the bottom surface of the second dielectric block 210 is formed on the upper surface of the first dielectric block 200. As the form larger than the area, any form of dielectric block capable of achieving the object of the present invention will be possible. In addition, the material of the second dielectric blocks 210 and 500 to 800 is preferably formed of a flexible printed circuit board, but the material of the second dielectric blocks 210 and 500 to 800 is not limited thereto. For example, if the object of the present invention can be achieved by using a copper plate or a stainless) substrate, it should be considered that it belongs to the scope of the present invention.

As mentioned above, although one preferred embodiment of the present invention has been illustrated and described, the present invention is not limited to the specific 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 these modifications should not be understood individually from the technical idea or the prospect of the present invention.

As described above, the built-in antenna according to the present invention can have a wider resonant frequency as much as possible while maintaining a miniaturized structure by using a discarded space inside the mobile terminal, so that it is easy to widen a desired resonant frequency. . In addition, by combining the second dielectric block according to the desired characteristics, it is possible to obtain a built-in antenna that realizes the desired characteristics in a simple and quick time, and thus requires a precise process according to the shape of the conventional radiator pattern or the dielectric material. And cost can be reduced.

Claims (3)

A first dielectric block on which a first radiator pattern is formed; And A second radiator pattern is formed and includes a second dielectric block horizontally coupled to an upper surface of the first dielectric block, One end of the first radiator pattern and one end of the second radiator pattern are electrically connected to each other, and the area of the bottom surface of the second dielectric block coupled to the top surface of the first dielectric block is larger than the area of the top surface of the first dielectric block. Built-in antenna, characterized in that large. The method according to claim 1, And the second dielectric block is a flat flexible printed circuit board. The method according to claim 1, And the second dielectric block extends in at least one of up, down, left, and right directions of an upper surface of the first dielectric block.

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