KR20080018044A - Mobile communication terminal improving antenna characteristic - Google Patents

Abstract

A mobile communication terminal is provided to install an antenna in a part which is not overlapped with a PCB(Printed Circuit Board) of a main body of a slide body in thickness direction, thereby improving antenna characteristics as minimizing a phenomenon that the antenna characteristics change by opening/closing actions of the slide body. The first body(110) is equipped with a PCB(Printed Circuit Board)(116). The second body(130) is installed on the first body(110) to do relative motion, so as to be partially overlapped with the PCB(116) in thickness direction. An antenna(150) is installed in a part which is not overlapped with the PCB(116) of the second body(130) in thickness direction. An antenna receiver(132) is protruded from an insertion unit(131) in thickness direction.

Description

MOBILE COMMUNICATION TERMINAL IMPROVING ANTENNA CHARACTERISTIC}

1 is a perspective view illustrating a state in which a slide main body of a general mobile communication terminal is closed;

FIG. 2 is a perspective view illustrating an open state of a slide main body of the mobile communication terminal illustrated in FIG. 1.

3A and 3B are perspective views each showing a closed state and an open state of a slide main body of a mobile communication terminal according to an embodiment of the present invention;

4A and 4B are conceptual views illustrating an operation in which the slide main body shown in FIGS. 3A and 3B slides on the main main body;

FIG. 5 is a partially broken perspective view for schematically showing an antenna of the mobile communication terminal shown in FIG. 3A;

6 is an exploded view of the antenna shown in FIG.

7A to 7C are views illustrating a state in which the antenna of FIG. 6 is applied to and used in the mobile communication terminal of FIG. 1;

8 is a graph showing the return loss of the antenna according to the state of use of each of the mobile communication terminal 7a to 7c,

9A to 9C are diagrams illustrating states in which the antenna of FIG. 6 is applied to and used in the mobile communication terminals shown in FIGS. 3A and 3B, and

10 is a graph showing the return loss of the antenna according to the state of use of the mobile communication terminal of FIGS. 9A to 9C.

<Description of Major Symbols in Drawing>

110; Main body 112; Audio output

114; Call button 116; First printed circuit board

110a; Main body front 110b; When the main body

120; Withdrawal unit 130; Slide body

131; Inserting portion 132; Antenna receiver

132a; Antenna receiver front 132b; Top of Antenna Receptacle

150; antenna

The present invention relates to a mobile communication terminal having an antenna.

In general, a mobile communication terminal may be classified into a bar type, a flip type, and a folder type.

The bar-type terminal is equipped with a data input / output means and a handset in one main body housing, and a keypad serving as a data barrier is always exposed, which may cause a malfunction. .

The flip terminal comprises a main body, a flip, and a hinge module for connecting the main body and the flip-flop, and the data input / output means and the handset are installed in the main body, and the flip covers the keypad, which is the data input means, to prevent malfunction. However, the flip type terminal also has a limitation in miniaturization due to the problem of securing distance between the transmitter and the receiver.

The folder-type terminal includes a main body, a folder, and a hinge module for rotatably connecting the main body and the folder to be opened and closed by rotating the folder. In the state where the folder is in close contact with the main body, the keypad is in the call waiting mode. It is possible to prevent the malfunction of the call mode in the call mode can be expanded to fully expand the distance between the transmitter and the receiver, there is an advantage in miniaturization. For this reason, the foldable terminal is the dominant mobile terminal.

On the other hand, as the design of mobile communication terminals is diversified, a sliding type mobile communication terminal composed of a sub-body installed to be slidable in the longitudinal direction on the main body is newly introduced and gradually commercialized.

1 and 2, a general sliding type mobile communication terminal includes a main body 10 and a slide body 30 slidably coupled to a rear surface of the main body 10. A display unit 11 and a first key input unit 13 are provided on the front of the main body 10, and a signal is provided to the display unit 11 and the first key input unit 13 inside the main body 10. A first printed circuit board (not shown) for delivery is provided. A second key input part 33 is provided at the lower front end of the slide body 30, and the first printed circuit board and the flexible printed circuit (FPC) are provided inside the slide body 30. A second printed circuit board (not shown) that is electrically connected is provided. In addition, the upper end of the second printed circuit board is embedded with an antenna 50 for transmitting and receiving radio waves.

As shown in FIGS. 1 and 2, the antenna 50 of the mobile communication terminal having the above-described structure may not only generate noise by the display unit 11, but also the main body 10 in the front direction. ), And antenna characteristics such as TRP (Total Radiated Power) or TIS (Total Isotropic Sensitivity) are degraded. In more detail, the mobile communication terminal as described above is in a state that the antenna 50 is covered in the front direction by the ground of the first printed circuit board provided in the main body 10, thereby degrading the antenna characteristics.

In addition, when the slide main body 30 is opened, the first printed circuit board of the main body 10 covers a wider range in the front direction, thereby further deteriorating the characteristics of the antenna 150.

In addition, as described above, the area covering the antenna 50 in the front direction is changed so that the characteristics of the antenna 50 change depending on whether the slide body 30 is opened or closed.

A battery 31 is mounted on the slide body 30, and a camera module (not shown) is mounted on the battery 31. Therefore, the upper end of the slide body 30 has a limited space for mounting the antenna 50, it is necessary to provide a separate space or to downsize the antenna (50). In addition, when a space for mounting the antenna 50 is separately provided at the upper end of the slide body 30, the size of the terminal becomes large. On the other hand, when the antenna 50 is made small in accordance with the mounting space, the performance of the antenna 50 cannot be optimized.

In addition, the antenna 50 as shown in FIGS. 1 and 2 is provided in a portion where the user grips the terminal, so that the antenna 50 inevitably occurs a hand-effect phenomenon as well as the user's call during the call. Head-Effects are also affected.

As described above, the antenna 50 is installed in a position that is covered by the main body 10, in particular, the ground plane of the printed circuit board, thereby not only changing the antenna characteristics according to opening and closing of the slide body 130, but also hand effect and Antenna characteristics such as TRP and TIS (receive sensitivity) are deteriorated due to the head effect phenomenon, and the transmission power of the antenna 50 is increased.

The present invention has been made in view of the above-described point, and provides a mobile communication terminal capable of improving antenna characteristics.

Another object of the present invention is to provide a mobile communication terminal that can minimize the change in antenna characteristics depending on whether the slide.

Still another object of the present invention is to provide a mobile communication terminal having an advantageous structure for slimming.

Still another object of the present invention is to provide a mobile communication terminal capable of reducing hand effect and head effect phenomenon.

According to an aspect of the present invention, there is provided a mobile communication terminal comprising: a first body provided with a printed circuit board; A second body installed to be movable relative to the first body to partially overlap the printed circuit board in a thickness direction; And an antenna installed at a portion of the second body that does not overlap in the thickness direction with the printed circuit board.

In addition, the above object is a first body provided with a voice output unit in the upper end in the longitudinal direction; A second body slidably coupled to the first body in a longitudinal direction (Y-axis direction) to partially overlap the first body in a thickness direction; And an antenna installed in the lower end portion in the longitudinal direction of the second body and not overlapping with the first body in the thickness direction.

In addition, the above object is a main body; A slide body installed in the main body so as to be inserted and withdrawn and having an insertion portion selectively inserted into the main body and an antenna accommodating portion not inserted into the main body; And it can also be achieved by a mobile communication terminal including an antenna installed in the antenna receiving portion.

According to an embodiment of the present invention, the antenna accommodating portion is formed to protrude in the thickness direction from the inserting portion, and in the state in which the slide main body is inserted into the main body, the longitudinal upper surface of the antenna accommodating portion is a lower surface of the main body. Contact with In addition, the front of the antenna receiving portion is located on the same plane as the front of the main body.

In addition, one side of the longitudinal upper end of the main body is provided with a call button for selectively withdrawing the slide body, the antenna receiving portion is located in the longitudinal lower end of the slide body. The insertion unit is provided with a key input unit. The slide body is withdrawn by the withdrawal unit linked to the call button.

A lower portion of the main body in the longitudinal direction is provided with a support formed to be stepped with the front of the main body to support the slide body.

Hereinafter, a mobile communication terminal according to an embodiment of the present invention will be described in detail.

3A and 3B, a mobile communication terminal according to an embodiment of the present invention includes a main body 110 that is a first body 110, an extraction unit 120, and a second body 130. And a slide body 130 and an antenna 150 embedded in the slide body 130.

The main body 110 has a hollow space formed therein so that the slide body 130 can be inserted, the both sides of the main body 110 is inserted into the guide groove 135 formed on both sides of the slide body 130. Guide rails (not shown) are provided. In this structure, the slide body 130 is installed to be inserted into and withdrawn from the main body 110. The main body 110 includes a display unit 111, an audio output unit 112, a first key input unit 113, a call button 114, and a first printed circuit board 116.

The display unit 111 is disposed on the front surface 110a, which is one surface of the main body 110 in the thickness direction (Z-axis direction), and is electrically connected to the first printed circuit board 116 to allow the first printed circuit to be formed. The image signal transmitted from the driver (not shown) mounted on the substrate 116 is converted into an image.

The voice output unit 112 is provided on an upper side of the display unit 111, which is an upper end of the front surface 110a of the main body 110.

The first key input unit 113 is an auxiliary input device provided to allow a user to input some functions even when the slide main body 130 is not opened. The display is located below the front 110a of the main main body 110. It is arrange | positioned under the part 111.

The call button 114 operates the drawing unit 120 to draw the slide body 130 from the main body 110, as shown in FIGS. 4A and 4B, the main body 110. It is installed to be movable in the left-right direction (X-axis direction) in the state pressed in one direction by the button spring 115 for one side of the).

The drawing unit 120 is for drawing the slide body 130 from the main body 110, as shown in Figure 4a and 4b, the switch projection 121, the sliding spring 124 and And a stopper 126.

The switch protrusion 121 is installed to be movable in the left and right directions (X-axis direction) while being pressed in one direction by the switch spring 122 in the slide body 130, the extension of the call button 114 Placed on board. The switch protrusion 121 is brought into contact with and hung by the locking jaw 123 formed in the main body 110 while the slide body 130 is inserted into the main body 110. However, when the call button 114 is pressed, one end of the inside of the call button 114 moves the switch protrusion 121 in the A direction, and the switch protrusion 121 is released from the locking step 123.

The sliding spring 124 is composed of a plurality, one end is installed on the spring support 125 formed in the main body 110, the other end is fixed to the slide body 130. By such a structure, the sliding spring 124 is always pressing in the direction in which the slide main body 130 is drawn out. Therefore, when the switch protrusion 121 is released from the locking step 123, the slide main body 130 is moved in the B direction by the elastic force of the sliding spring 124 is drawn out from the main body 110.

The stopper 126 is for fixing in the drawn state of the slide body 130 and is installed to be movable in the left and right directions (X-axis direction) in a state in which the slide body 130 is elastically pressed in one side direction. In addition, the main body 110 is formed with a stopper groove 127 into which the stopper 126 is inserted. As the slide body 130 moves in the B direction, the stopper 126 is inserted into the stopper groove 127 so that the slide body 130 is in a fixed state where it is no longer moved.

Looking at the process of inserting the slide body 130 of the drawn state into the main body 110, first, the user presses the slide body 130 into the main body 110 with a force greater than the pressing force of the sliding spring 124. do. Then, the slide body 130 is moved in the direction to be inserted into the main body 110. The slide body 130 is partially inserted into the main body 110, and the switch protrusion 121 is caught by the locking jaw 123 so that the sliding body 130 is inserted into the main body 110. It is fixed in a state.

In the present exemplary embodiment, the structure of the semi-automatic slide is illustrated. However, unlike the present exemplary embodiment, a structure for automatically inserting and withdrawing the slide body 130 into the main body 110 using a motor may be applied. In addition, in the present exemplary embodiment, the slide body 130 is moved in a linear direction with respect to the main body 110, but the slide body 130 is rotated on the main body 110 as in the case where the slide body 130 is rotated on the main body 110. ) Is moved relative to the main body 110, the idea of the present invention can be applied to any mobile communication terminal that can change the relative position of the slide body 130 and the main body 110.

The first printed circuit board 116 has a plurality of IC elements mounted therein, and is electrically connected to the display 111, the audio output 112, and the first key input 113. In particular, since the ground plane is formed on the first printed circuit board 116, the relative position of the first printed circuit board 116 and the antenna 150 has a great influence on the characteristics of the antenna 150. Therefore, the antenna 150 may be disposed as far away from the first printed circuit board 116 as possible.

On the other hand, the support 117 is provided at the lower end of the main body 110 in the longitudinal direction (Y-axis direction) so that the slide main body 130 can be stably supported by the main body 110 even when the slide body 130 is drawn out. The support portion 117 is formed to be stepped from the front surface 110a of the main body 110 by a predetermined height, and the support portion 117 so that the front surface 132a of the slide body 130 is exposed to the outside. The thickness direction (Z-axis direction) of the front face is opened. When the slide main body 130 is pulled out by the support 117 having the above structure, the second key input unit 133 provided in the slide main body 130 may be exposed to the outside, in particular, the slide main body 130. It will be able to support more stably.

A part of the slide body 130 is installed to be inserted into and withdrawn from the main body 110, and the slide body 130 has an insertion portion 131, an antenna receiving portion 132, The second key input unit 133 and the second printed circuit board 134 are provided.

The insertion part 131 is located inside the main body 110 when the slide body 130 is inserted into the main body 110, and the slide body 130 is the main body 110. In the withdrawn state, part is exposed to the outside.

The antenna accommodating part 132 is formed to protrude in the thickness direction (Z-axis direction) from the insertion part 131 at a lower end of the insertion part 131 in the longitudinal direction (Y-axis direction). The antenna accommodating part 132 is not inserted into the main body 110 even when the slide body 130 is inserted into the main body 110, that is, the slide body 130 is closed. Therefore, the antenna 150 embedded in the antenna accommodating part 132 is not covered by the first printed circuit board 116 in the thickness direction (Z-axis direction), thereby inserting and withdrawing the slide body 130. It is possible to maintain a constant antenna characteristic regardless of the state.

The height of the antenna accommodating part 132 may vary depending on the height of the antenna 150, but the front surface 132a of the antenna accommodating part 132 may be formed on the main body 110 in order to improve design and miniaturization of the terminal. It is preferable to set the height of the antenna accommodating part 132 to be located on the same plane as the front face 110a. Meanwhile, in a state in which the slide main body 130 is inserted into the main main body 110, that is, in a state in which the slide main body 130 is closed, the longitudinal direction (Y-axis direction) upper surface 132b of the antenna accommodating part 132 may be formed in the main main body 110. It is in close contact with the bottom surface 110b of the main body 110 in the longitudinal direction (Y-axis direction).

The second key input unit 133 is a main input device, which is provided at the front of the insertion unit 131 and is not exposed to the outside when the slide body 130 is closed, but in the open state of the slide body 130. Exposed to the outside. Therefore, the user can use the second key input unit 133 only when the slide body 130 is opened.

As shown in FIG. 5, the second printed circuit board 134 is embedded in the slide body 130. The second printed circuit board 134 is electrically connected to the first printed circuit board 116 as well as the second key input unit 133 and the antenna 150.

The antenna 150 is embedded in the antenna accommodating part 132 and is installed at the lower end of the second printed circuit board 134. As shown in FIG. 5, the antenna 150 may be electrically connected to the first antenna body 151 and the first antenna body 151 arranged side by side on the second printed circuit board 134. A second antenna body 152 to be connected, a connection line 153 for electrically connecting the first and second antenna bodies 152 (), and a power supply for feeding power to the first antenna body 151 And a pin 154 and a ground pin 155 for grounding the first and second antenna bodies 152 () to a ground plane (not shown) provided on the second printed circuit board 134.

The first antenna body 151 is electrically connected to the circuit pattern of the second printed circuit board 134 through the feed pin 154, and the second printed circuit board 134 through the ground pin 155. Is grounded at the ground plane. The circuit pattern is electrically connected to the oscillator, so that an electrical signal output from the oscillator is transmitted to the first antenna body 151 through the circuit pattern and the feed pin 154 and radiated. The first antenna body 151 is designed to have a resonant frequency in a high frequency region to radiate only a high frequency electric signal to the outside. On the other hand, a slit 151a is formed in the first antenna body 151, and a band is designed by adjusting the width of the slit 151a.

The second antenna body 152 is electrically connected to the first antenna body 151 by a connection line 153 and is designed to have a resonance frequency in a low frequency region. Therefore, the low frequency electrical signal is oscillated from the oscillator and transmitted to the second antenna body 152 through the circuit pattern, the first antenna body 151 and the connection line 153 and radiates.

Meanwhile, the first antenna body 151 and the second antenna body 152 are coupled to each other to extend the bandwidth in the high frequency band.

Referring to FIG. 6, the antenna 150 is manufactured by bending a plate manufactured in the shape as shown in FIG. 6 twice in the same direction along the first and second bending lines BL1 and BL2.

7A to 7C are views illustrating a state in which the antenna 150 shown in FIG. 5 is applied to the mobile communication terminals shown in FIGS. 1 and 2, and FIG. 8 is shown in FIGS. 7A to 7C. It is a graph showing the return loss of the antenna 150 according to the use state of the mobile communication terminal.

7A to 8, the reflection loss of the antenna 50 in the state in which the slide body 30 is closed, the reflection loss in the state in which the slide body 30 is open, and the slide body 30 in the open state. It can be seen that there is a large difference in the return loss when the user grasps at. As described above, the change in the reflection loss graph depends on whether the slide body 30 is opened or closed, because the relative positions of the antenna 50 and the printed circuit board of the slide body 30 change. That is, the state where the ground plane provided on the printed circuit board overlaps with the antenna 50 in the thickness direction (Z-axis direction) is changed. For this reason, it is difficult to design the antenna 50 capable of securing a desired service band regardless of whether the desired slide body 30 is opened or closed. Even if the antenna 50 is manufactured and applied to the desired service band, the performance of the antenna 50 is reduced. In addition, as shown in FIG. 7C, the antenna 50 is installed at a position where the user's hand covers the antenna 50, thereby causing a change in antenna characteristics by the user's hand (hand-effect).

In this way, the antenna 50 overlaps the printed circuit board of the slide body 30 in the thickness direction (Z-axis direction) and is installed at a position where the antenna 50 is gripped by a user's hand, thereby allowing the antenna 50 as described above. ) Is deteriorated.

9A to 9B are diagrams illustrating a state in which the antenna 150 manufactured to the dimensions of FIG. 6 is applied to the mobile communication terminals illustrated in FIGS. 3A and 3B, and FIG. 10 is illustrated in FIGS. 9A to 9C. It is a graph showing the return loss of the antenna 150 according to the use state of the mobile communication terminal shown.

9A to 10, the slide body 130 in which the slide body 130 is closed is inserted into the main body 110, and the slide body 130 in the open state of the slide body 130. It can be seen that the reflection loss graph of the antenna 150 is almost unchanged for each of the state drawn out from the main body 110 and the state in which the user grips the terminal while the slide body 130 is opened. 9A and 9B, the main body 110 is not covered by the first printed circuit board 116 of the main body 110 in the thickness direction (Z-axis direction). ) And the relative loss of the slide body 130 does not affect the reflection loss of the antenna 150. In addition, as shown in FIG. 9C, by installing the antenna 150 at the lower end of the direction in which the antenna 150 is drawn out, the antenna 150 may be separated as far as possible from the part held by the user's hand. In particular, by installing the call button 114 on the top of the main body 110, the user moves the state as shown in Figure 9c because the user grips the terminal in the same hand posture as pressing the call button 114 during the call The likelihood of the communication terminal being gripped increases further, minimizing hand effects.

In addition, the audio output unit 112 is provided at the upper end of the main body 110 in the longitudinal direction (Y-axis direction), and the antenna 150 is provided at the lower end of the slide body 130 in the longitudinal direction (the Y-axis direction). 150 may be as far away from the user's head as possible to minimize the head effect phenomenon that the antenna characteristics are changed by the user's head.

According to the present invention as described above, by installing the antenna in the portion of the slide main body that does not overlap in the thickness direction with the printed circuit board, it is possible to improve the characteristics of the antenna, such as the return loss, Accordingly, the phenomenon of changing antenna characteristics can be minimized.

In addition, by installing a call button in the longitudinal upper end of the main body and the antenna in the longitudinal lower end of the slide main body, it is possible to separate the antenna as far as possible from the gripped by the user's hand, the characteristics of the antenna by the hand This deteriorating hand effect phenomenon can be minimized.

In addition, by installing the audio output unit at the upper end in the longitudinal direction of the main body and the antenna at the lower end in the longitudinal direction of the slide main body, the antenna can be separated from the user's head as far as possible during a call, thereby degrading antenna characteristics by the user's head Minimize the head effect phenomenon. Conversely, this structure can protect the user's head from electromagnetic waves emitted from the antenna.

In addition, it is possible to minimize the waste of antenna transmission power by hand or head.

On the other hand, by providing a separate antenna receiving portion in which the antenna is built, it is possible to design the height of the main body or the slide body irrespective of the height of the antenna it is possible to slim the terminal. In addition, the antenna can be designed to have an optimal height in the desired service band because there is no restriction of the height.

Claims (10)

A first body provided with a printed circuit board; A second body installed to be movable relative to the first body to partially overlap the printed circuit board in a thickness direction; And And a antenna installed at a portion of the second body that does not overlap the printed circuit board in a thickness direction. A first body provided with an audio output unit at an upper end in a longitudinal direction; A second body slidably coupled to the first body in a longitudinal direction to partially overlap the first body in a thickness direction; And A mobile communication terminal comprising an antenna provided in the lower end in the longitudinal direction that does not overlap in the thickness direction with the first body of the second body. Main body; A slide body installed in the main body so as to be inserted and withdrawn and having an insertion portion selectively inserted into the main body and an antenna accommodating portion not inserted into the main body; And A mobile communication terminal comprising an antenna installed in the antenna receiving portion. The method of claim 3, The antenna receiving portion is a mobile communication terminal, characterized in that formed to protrude in the thickness direction from the insertion portion. The method of claim 4, wherein And a top surface in the longitudinal direction of the antenna accommodating portion is in contact with a bottom surface of the main body while the slide body is inserted into the main body. The method of claim 5, The front of the antenna receiving portion is a mobile communication terminal, characterized in that located on the same plane as the front of the main body. The method of claim 3, One side surface of the longitudinal upper end of the main body is provided with a call button for selectively withdrawing the slide body, The antenna receiving portion is a mobile communication terminal, characterized in that located in the longitudinal lower end of the slide body. The method of claim 7, wherein And a key input unit is provided in the insertion unit. The method of claim 7, wherein And a drawing unit which draws out the slide body in association with the call button. The method of claim 7, wherein And a support part formed to be stepped with the front surface of the main body so as to support the slide body under the longitudinal direction of the main body.

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