KR100718641B1 - Compact high performing Antenna for folder and slide type handset application - Google Patents

Abstract

The present invention includes a radiator comprising a start portion, a meander line portion, a rear portion, and a final portion, a signal applying portion for applying a signal to the radiator, and a ground portion (1) for grounding the radiator. The final part is related to the built-in antenna, characterized in that disposed inside the antenna, when the configuration is applied to the slide-type or foldable terminal, the so-called 'frequency shifting' phenomenon can be significantly reduced.

Built-in Antenna, Cord Multi-Division, Frequency Shift

Description

Compact high performing antenna for folder and slide type handset application}

1 is a view showing a conventional MLA built-in antenna, Figure 1a is a front perspective view, Figure 1b is a rear perspective view;

2 is a characteristic diagram showing VSWR characteristics at the time of slide-up and slide-down when a conventional MLA built-in antenna is applied to a slide type terminal;

Figure 3 is a view showing a first embodiment of the present invention, Figure 3a is a front perspective view, Figure 3b is a rear perspective view, Figure 3c is a rear perspective view;

4 is a characteristic diagram showing VSWR characteristics at the time of slide up and slide down when the first embodiment of the present invention is applied to a slide type terminal;

FIG. 5A is a diagram showing a copy pattern in a slide down state of a slide type terminal to which the first embodiment of the present invention is applied, and FIG. 5B is a diagram showing a copy pattern in a slide up state of the slide type terminal to which the first embodiment is applied;

6A to 6F are views for explaining the manufacturing process of the first embodiment of the present invention;

 Figure 7 is a view showing a second embodiment according to the present invention, Figure 7a is a front perspective view, Figure 7b is a rear perspective view;

8 is a characteristic diagram showing VSWR characteristics at the time of slide up and slide down when the second embodiment of the present invention is applied to a slide type terminal;

9 is a characteristic diagram showing VSWR characteristics at the time of slide up and slide down when the second embodiment of the present invention is applied to a slide type terminal; And

FIG. 10A is a diagram illustrating a copy pattern in a slide down state of a slide type terminal to which a second embodiment of the present invention is applied, and FIG. 10B is a diagram illustrating a copy pattern in a slide up state of a slide type terminal to which a second embodiment is applied. .

* Short description of the major reference marks *

1.11, 21 .... Ground

2. 12, 22 ....

3, 13, 23 .... beginning

4, 15, 25 .... posterior

5 ... side

14, 16, 24 .... Minder line part

6, 17, 26 .... Final

The present invention relates to a built-in antenna, and more particularly, to a built-in code division multiple access antenna that improves transmission and reception quality by solving a frequency shift problem that occurs when the antenna is applied to a slide type or folding type portable terminal. .

A portable terminal refers to a mobile phone, a PDA, and the like, and refers to a device that allows a user to transmit and receive while moving.

Among known antennas used in conventional portable antennas are external antennas. There are monopole antennas and helical antennas in the external space of the portable terminal. The external antenna may be damaged by an external shock, and since the position of the antenna is near the head of the user when using the terminal, the external antenna may adversely affect the head of the user. In addition, external antennas can be said to counteract the recent trend of miniaturization of portable terminals.

Thus, a built-in antenna called a meanderline antenna (MLA) as shown in FIG. 1 has been developed. As shown in Fig. 1, the conventional built-in antenna comprises a ground portion 1, a signal applying portion 2, and a helical radiator, which radiates from the ground portion 1 and the signal applying portion 2; A starting part 3 formed to extend, a rear part 4 bent and extended from the start part 3, a side part 5 which is bent and extended from the rear part 4 and a final part formed to extend from the side part 5 It consists of a part (meander line part) 6. As shown in the figure, the last part 6 of the conventional built-in antenna is formed toward the outside, and the ground part 1 and the signal applying part 2 are formed on the side of the antenna.

When such a built-in antenna is applied to a slide type terminal or a folding type terminal, frequency shift occurs when the mobile phone is used or not (ie, a slide up state and a slide down state, a folder up state and a folder down state). There was a problem. 2 is a characteristic diagram showing the voltage standing wave ratio (VSWR) characteristics of the slide-up and the slide-down when a conventional MLA built-in antenna is applied to a slide type terminal. Is a line indicating a slide down state. Referring to FIG. 2, it can be seen that the frequency is shifted to the left side when the slide up is performed compared to the slide down.

Thus, according to the type or use state of the terminal, the cause of the frequency shift is because the PCB of the mobile phone is moved to the vicinity of the antenna when using the terminal, the interference phenomenon occurs according to this movement.

The present invention has been made to solve the problems of the prior art, and relates to an antenna that significantly reduces the frequency shift when using a slide cell phone to improve the call quality.

The built-in antenna according to a feature of the present invention includes a spiral radiator having a start portion, a meander line portion, a rear portion, and a final portion, a signal applying portion for applying a signal to the radiator, and a ground portion for grounding the radiator. An application unit is disposed inside the radiator.

According to the above configuration, since the signal applying portion, which is the most sensitive portion of the antenna, is disposed in the center of the radiator, the interference by the PCB is minimized, so that the frequency shift is prevented to improve the transmission and reception quality of the antenna.

The built-in antenna of the present invention may be formed by projecting the signal applying unit downward from the start. If the signal applying portion protrudes downward, the antenna can be easily assembled to the terminal.

The built-in antenna of the present invention may be configured such that the signal applying unit and the ground unit are disposed adjacent to each other. When the signal applying portion and the ground portion are disposed adjacent to each other, the loss is small and the radiation efficiency can be maximized.

In the built-in antenna of the present invention, the signal applying portion and the ground portion may include a semicircular portion and an inclined portion, respectively. If the signal applying portion and the ground portion include the semicircular portion and the inclined portion, they can be connected with elasticity, thereby increasing the connection reliability of the terminal.

The built-in antenna according to another aspect of the present invention, which transmits and receives a signal, a spiral radiator having a start, a meander line portion, a rear portion, and a final portion, a signal applying unit for applying a signal to the radiator, and grounding the radiator A ground portion, the starting portion being disposed at the center of the radiator

In the antenna according to another aspect of the present invention, by designing the end portion of the radiator away from the PCB, it is possible to prevent the frequency shift and performance degradation caused during the slide up.

In addition, in the antenna according to another aspect of the present invention, the signal applying unit can be formed in the center of the radiator. In this case, since not only the signal applying portion but also the final portion of the radiator is disposed far from the PCB, it is possible to further prevent the frequency shift occurring during the slide up.

In addition, in the antenna according to another aspect of the present invention, the signal applying portion and the ground portion may be formed adjacent to each other. In this case, since the signal applying portion and the ground portion are formed adjacent to each other, the loss can be minimized and the radiation efficiency can be maximized.

In addition, in the antenna according to another aspect of the present invention, the signal applying portion and the ground portion may include a semi-circular portion and an inclined portion, respectively. If the signal applying portion and the ground portion include the semicircular portion and the inclined portion, they can be connected with elasticity, thereby increasing the connection reliability of the terminal.

In accordance with another aspect of the present invention, there is provided a method of manufacturing an embedded antenna, the method including: providing a metal plate including a ground part, a signal applying part, and a part to be a radiator consisting of a start part, a meander line part, a rear part, and a final part; Bending the start portion forward to form a meander line portion; Forming a second meander line portion by continuously bending the rear left end of the rear portion twice; Bending backward portions of the ground portion, the signal applying portion, and the start portion; And bending down the ground portion and the signal applying portion to protrude downward in the center portion of the antenna.

According to this, it is possible to manufacture the antenna to prevent the frequency shift by a simple and economical process.

In addition, the manufacturing method may further include forming the inclined portion and the semicircular portion by bending the ground portion and the signal applying portion, respectively. The built-in antenna manufactured by this method has excellent connection reliability.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in more detail.

[First Embodiment]

A first embodiment of the present invention will be described in detail with reference to Figs. 3 is a view showing a first embodiment of the invention, Figure 3a is a front perspective view thereof, Figure 3b is a rear perspective view, Figure 3c is a rear perspective view.

As shown in the figure, the antenna of the first embodiment comprises a radiator for transmitting and receiving signals, a ground portion 11 for grounding the radiator, and a signal applying portion 12 for applying a signal to the radiator. The radiator is formed by connecting from the ground portion 11 and the signal applying portion 12, the start portion 13, the meander line portion (14, 16), the rear portion 15, and the end portion 17 ), The start portion 13, the meander line portions 14 and 16, the rear portion 15 and the final portion 17 are spirally formed.

The starting part 13 of the radiator formed extending from the signal applying part 12 is the most sensitive part of the components of the antenna. In this embodiment, the starting part 13 is formed at the center part of the antenna, that is, at the center part of the helical radiator. do. As such, when the starter 13 is formed at the center of the radiator, compared to the conventional art in which the starter is formed outside the radiator, the starter 13 is applied to the slide-type terminal so that when the slide-up (in use) becomes far from the PCB, the frequency is increased. The movement is significantly reduced.

In addition, the ground portion 11 and the signal applying portion 12 each have a semicircular portion 11-1, 12-1 and the inclination portion 11-2, 12-2 has a configuration, thereby providing an appropriate elasticity I can have it. Therefore, when the antenna of the present invention is applied to the terminal, it is possible to increase the connection reliability of the antenna.

 4 is a characteristic diagram showing VSWR characteristics at the time of slide up and slide down in the slide type terminal to which the antenna of the first embodiment is applied. In FIG. 4, line A is a line representing VSWR at the time of slide up, and line B is a line representing VSWR at the time of slide down. As can be seen in Figure 4, unlike the prior art, the frequency shift hardly appears. 5 is a diagram showing a copy pattern when the antenna according to the present invention is applied to a CDMA terminal, FIG. 5A shows a copy pattern at the time of slide down, and FIG. 5B shows a copy pattern at the time of slide up. As shown in FIG. 5, the radiation pattern at the time of slide up and the radiation pattern at the time of slide down are almost the same, and the average gain is -4.2 dBi to -5.3 dBi. It is commercially available because of this excellent average gain.

6 is a view for explaining the manufacturing process of the first embodiment of the present invention. As shown in Fig. 6A, a metal plate having a ground portion 11, a signal applying portion 12, and a portion to be a radiator is first formed by using a conventional technique. Then, as shown in FIG. 6B, the start portion of the right side is bent forward to form the meander line portion 16. Thereafter, as shown in FIGS. 6C and 6D, the rear left portion is continuously bent two times in the clockwise direction to form the meander line portion 14, and then, as shown in FIG. 6E, the ground portion 11 is shown. ), The portion consisting of the signal applying portion 12 and the start portion 13 is bent backward, and as shown in FIG. 6F, the ground portion 11 and the signal applying portion 12 are bent downward, and After projecting downward in the center portion, the ground portion 11 and the signal applying portion 12 are bent to form the inclined portions 11-1 and 12-1 and the semicircular portions 11-2 and 12-2. The built-in antenna of one embodiment is completed.

Second Embodiment

A second embodiment of the present invention will be described in detail with reference to FIGS. 7 to 10. 6 is a view showing a second embodiment of the invention, Figure 7a is a front perspective view, Figure 7b is a rear perspective view.

As shown in the figure, the antenna of the second embodiment consists of a radiator for transmitting and receiving signals, a ground portion 21 for grounding the radiator, and a radiator signal applying portion 22 for applying a signal to the radiator. It consists of a start portion 23, a meander line portion 24, a rear portion 25 and the end portion 26, the ground portion 21 extends from the start portion 23 to form a protrusion The signal applying portion 22 extends from the meander line portion 23 to protrude. In addition, the radiator is formed spirally as shown.

The final part 26 of the radiator is a very sensitive part of the components of the antenna. In this embodiment, this final part 26 is formed at the center of the antenna, ie at the center of the helical radiator. In this way, when the end portion 6 is formed at the center of the radiator, the distance from the PCB is farther than that of the conventional art in which the start portion is formed outside the radiator, so that the frequency shift phenomenon is significantly reduced.

FIG. 8 is a view for comparing the conventional technology with the second embodiment, and FIG. 8A is an internal schematic view of a slide antenna to which a conventional internal antenna is applied, and FIG. 8B is an internal schematic view of a slide terminal to which a second embodiment is applied. .

The slide type terminal includes a lower plate 30 and an upper plate 40, and a lower plate 30 includes a PCB 31 and an antenna 32, and the upper plate 40 includes a slide frame 41 and an LCD 42. It is built. As shown in FIG. 8A, which schematically illustrates a structure in which a conventional antenna is incorporated in a slide type terminal, in the related art, a near field electric field in which the end portion 321 of the radiator is formed on the outer side of the radiator is a top plate 40 of the slide phone. ), A serious interference phenomenon occurs, and thus a frequency shift phenomenon occurs. In contrast, in the slide type terminal to which the second embodiment of the present invention is applied, as shown in FIG. 8B, since the end portion 322 of the radiator is formed inside the antenna 32, a near field formed from the radiator is formed. Since far away from the top plate 40 of the slide phone, compared with the prior art, the interference phenomenon is reduced, it is possible to reduce the frequency shift.

FIG. 9 is a characteristic diagram illustrating a voltage standing wave ratio (VSWR) characteristic when sliding up and sliding down when the second embodiment of the present invention is applied to a slide type terminal. In FIG. 9, line A is a line representing VSWR at the time of slide up, and line B is a line representing VSWR at the time of slide down. As can be seen in Figure 9, compared with the prior art, it can be seen that the frequency shift is significantly improved. 10 is a diagram showing a copy pattern when the antenna according to the present invention is applied to a CDMA terminal, Figure 10a is a copy pattern when the slide down, Figure 10b is a view showing the copy pattern when the slide up. As shown in Fig. 10, the radiation pattern at the time of slide up and the radiation pattern at the time of slide down are almost the same, indicating that the antenna gain is stable both at the time of slide-up and slide-down.

As mentioned above, the preferred embodiment of this invention was described. However, it should be understood by those skilled in the art that the present invention can be modified and changed, and the protection scope of the present invention should not be construed as being limited to the above embodiments, and the appended claims. Should be decided by

According to the configuration of the present invention as described above, it is possible to prevent the frequency shift occurring during the slide up or folder up, to improve the transmission and reception quality of the built-in antenna, and also to minimize the loss by placing the signal applying portion and the ground portion in close proximity It has the effect of maximizing the radiation efficiency.

Claims (10)

In the built-in antenna mounted in the portable terminal, A spiral radiator for transmitting and receiving a signal, comprising: a spiral radiator including a start part, a meander line part, a rear part, and a final part; The meander line portion is bent from the beginning and the end to form a side wall, A signal applying part for applying a signal to the radiator and a ground part for grounding the radiator are connected to the start part; And the signal applying part and the ground part are located inside the side wall. The method of claim 1, The signal applying unit protrudes downward from the start, the built-in antenna. The built-in antenna of claim 1 or 2, wherein the signal applying unit and the ground unit are disposed adjacent to each other. The built-in antenna of claim 3, wherein the signal applying unit and the ground unit each include a semicircular portion and an inclined portion. In the built-in antenna mounted in the portable terminal, A spiral radiator for transmitting and receiving a signal, comprising: a spiral radiator including a start part, a meander line part, a rear part, and a final part, Signal applying unit for applying a signal to the radiator, A ground part for grounding the radiator; The start part, the meander line part, and the rear part form sidewalls, And the final part is disposed at the center of the radiator. The method of claim 5, The signal applying part and the ground part are formed inside the side wall. The built-in antenna of claim 6, wherein the signal applying unit and the ground unit are formed adjacent to each other. The built-in antenna of claim 6, wherein the signal applying unit and the ground unit are formed to include a semicircular portion and an inclined portion, respectively. As a manufacturing method of an internal antenna mounted on a portable terminal, Providing a metal plate comprising a ground portion, a signal applying portion, and a portion to be a radiator consisting of a start portion, a meander line portion, a rear portion, and a final portion; Bending the start portion forward to form a meander line portion; Forming a second meander line portion by continuously bending the rear left end of the rear portion twice; Bending backward portions of the ground portion, the signal applying portion, and the start portion; And And bending down the ground portion and the signal applying portion to protrude downward in the center portion of the antenna.  The method of claim 9, further comprising bending the ground portion and the signal applying portion to form slopes and semi-circular portions, respectively.

Images