KR20030079550A - Antenna apparatus and control method capable of moving for mobile communication device - Google Patents

Abstract

PURPOSE: A movable antenna device in a mobile terminal and a method for controlling the same are provided to improve the reception rate by movably controlling an antenna installed in a mobile terminal and to minimize the effect of electromagnetic waves by reducing the SAR(Specific Absorption Rate). CONSTITUTION: A movable antenna device in a mobile terminal is comprised of a control unit(300), a moving path implement unit(100), a connection unit, and a driving unit(200). The control unit(300) detects an RSSI and generates an antenna position control signal according to the RSSI. The moving path implement unit(100) has a bend to move the antenna horizontally or vertically at the same time. The connection unit, attached to the antenna, is to move the antenna through the moving path implement unit(100). The driving unit(200), driven clockwise or counterclockwise according to the antenna position control signal, moves the antenna, attached to the moving path implement unit(100), horizontally and vertically.

Description

MOVED ANTENNA APPARATUS AND CONTROL METHOD OF A MOBILE COMMUNICATION TERMINAL {ANTENNA APPARATUS AND CONTROL METHOD CAPABLE OF MOVING FOR MOBILE COMMUNICATION DEVICE}

The present invention relates to an antenna of a mobile communication terminal, and in particular, to control the position of the antenna mounted on the terminal to be movable, to improve the reception rate, and to reduce the electromagnetic wave absorption rate (SAR) to affect the effect of electromagnetic waves on the human body. The present invention relates to a movable antenna device of a mobile communication terminal and a control method thereof.

In general, spatial diversity to overcome the effects of fading is a method of using two or more receiving antennas that are spaced sufficiently apart.

In order to achieve spatial diversity, the signals coming from different antennas must not be correlated with each other, so the distance between the antennas should be far enough apart. This is difficult to achieve when the receiver is small in hand and difficult to obtain an equally strong signal. In addition, there is a problem in the price and power of the terminal.

Therefore, the mobile communication system serves hundreds or thousands of terminals and is equipped with a base station, which is limited in sufficient space and complexity for a plurality of antennas in comparison with the terminals, thereby increasing the performance of the forward link diversity. The situation is using.

However, due to the transmission antenna diversity, a study has been conducted to obtain a diversity effect even in a mobile communication terminal because a reception rate cannot be increased in an area having a radio wave environment worse than that in reality.

However, as described above, the diversity function of mounting two or more antennas in the mobile communication terminal to increase the reception rate by diversifying the selectivity and the reception paths thereof is rather small when the mobile communication terminal is small. Interference can improve the propagation performance and inversely reduce the reception sensitivity, and there are problems in that the Specific Absorption Rate (SAR) cannot be ignored because two or more antennas are mounted.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, by controlling the position of the antenna mounted on the terminal to be movable, to improve the reception rate, and to reduce the electromagnetic wave absorption rate (SAR) SUMMARY OF THE INVENTION An object of the present invention is to provide a movable antenna device of a mobile communication terminal and a control method thereof to reduce the influence of electromagnetic waves.

The present invention for achieving the above object, the control means for detecting the strength of the received signal and generates an appropriate antenna position control signal accordingly; A curved movement path mechanism capable of attaching an antenna and moving simultaneously in a horizontal or vertical direction; Connecting means attached to the antenna to move the antenna through a movement path mechanism; It is characterized in that it comprises a drive means for forward or reverse rotation driven by the position control signal of the control means for moving the antenna attached to the movement path mechanism in a horizontal or vertical direction.

In addition, the present invention is an antenna control method that can move the position of the antenna in a horizontal or vertical direction, the method comprising: determining the current position information of the antenna when the call of the terminal; Detecting an intensity (RSSI_i) of the received signal at the position (i); Determining that the signal is in a stable state when the strength of the received signal RSSI_i is equal to or greater than a predetermined reference value Pr, and fixing the position of the current antenna; When the intensity of the received signal at the moved position is less than a predetermined reference value, it is characterized in that the step of repeating the process to move the antenna to a position where the intensity of the received signal is greater than the reference value.

1 is an exemplary view showing a side configuration of a movable antenna device of a mobile communication terminal according to the present invention.

2 is an exemplary view showing a front configuration of a movable antenna device of a mobile communication terminal according to the present invention.

Figure 3 is a flow chart showing the processing flow of the control method of the movable antenna of the mobile communication terminal according to the present invention.

*** Description of the symbols for the main parts of the drawings ***

100: moving path mechanism 200: driving means

300: MSM Chip

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

At this time, in the following description, many specific details such as specific processing flows are shown to provide a more general understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be obvious to them.

In addition, detailed description of well-known functions and structures which are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

The position where the reception sensitivity is the best in the mobile communication terminal may be the back of the receiving unit in the case of the folding terminal, and may be the upper end of the battery in the case of the flip terminal. In the embodiment of the present invention shown in FIG. For convenience, the description will be made based on a folding terminal.

In the case of the folding terminal, the rear side of the upper receiving unit is equipped with an LCD, a speaker, and a receiving unit. After creating a space therein, an antenna having a constant bend or shape, such as a U, can move. Configure the movement path mechanism 100 that is.

The movement path mechanism 100 may be driven in hardware using the principle of a fan belt, or by making a groove such as a screw in a flexible material such as rubber and using a driving means 200 such as a motor connected thereto. By rotating, it can move along its groove (or fan belt).

Of course, in order to move the antenna along the movement path mechanism 100, a connection means (not shown) having an appropriate shape according to the type of movement path mechanism (lead screw, fan ball, etc.) should be provided in the antenna.

As described above, if the person working in this industry, such a device may be configured as much as the size and shape of the terminal.

In this case, however, it should be noted that when the moving path mechanism 100 and the antenna are mechanically coupled, the antenna should be exactly 90 ° or horizontally parallel to the folder. Since it is proved that both are not advantageous in terms of the aspect, it is preferable to construct an antenna by giving a slight inclination as shown in FIG.

Afterwards, the position of the antenna is shifted at the point where the reception sensitivity (RSSI) falls by software. In this case, it is important to note that the SAR may drop at a specific position, so even if the reception sensitivity is good, the SAR If this is particularly bad, adjust the position of the antenna so that it can move to the proper position.

1 is an exemplary view showing a configuration of a movable antenna device of a mobile communication terminal according to the present invention, which is an exemplary view of the antenna device attached to a clamshell terminal from the side. The position of the antenna copper wire moving according to the shape (U-shaped in this embodiment) of the movement path mechanism 100 can be known.

That is, referring to FIG. 1, it can be seen that the antenna is mounted on the rear side where the LCD is located, and the antenna maintains a predetermined angle with respect to the ground surface, not vertically or horizontally. Although the angle is preferably about 15 ° according to the experiment, it is obvious that the design can be changed to maintain the proper angle according to the characteristics of the terminal.

Next, FIG. 2 is an enlarged exemplary view of the antenna device attached to the foldable terminal when viewed from the front, and after configuring the path of the antenna by the inverted U-shaped moving path mechanism 100 on the back of the LCD, The antenna is configured to move left and right or up and down along the movement path mechanism 100.

Here, the reception sensitivity (RSSI) is connected to the drive means by controlling the drive means 200 by checking the intensity of the received signal in the control means (MSM chip: 300) in the figure, and generates an appropriate control signal accordingly. By rotating the movement path mechanism 100 or driving a fan belt (not shown), the antenna moves along the movement path mechanism 100.

2 is a flow chart showing a processing flow of a control method of a movable antenna of a mobile communication terminal according to the present invention. In the above, the positional variation of the antenna should satisfy the criteria of the SAR, which are proposed in the international and domestic standards.

In the actual shield room for radio wave shielding, a result value expressed by the following equation can be obtained by radio wave transmission of the terminal relative to the rotation.

SAR = δ | E ² | / ρ (Conductivity * Electric Field * Electric Field) / (Density)

Referring to FIG. 3, the present invention moves the antenna to find an optimal position when the reception sensitivity drops while the user checks the reception sensitivity (RSSI) from time to time while the user uses the terminal.

At this time, the electromagnetic wave absorption rate (SAR) is not measured directly, but must be designed in advance to satisfy the antenna position in all directions.

Therefore, the data is configured to be utilized as internal reference data of the terminal. That is, the electromagnetic wave absorption rate (SAR) should be mounted at a position that is not a problem by configuring the user so that the antenna is sufficiently satisfied with the antenna position.

The program according to the processing flow is stored in the internal memory (not shown) of the terminal, and the operation according to the processing flow is performed by the MSM chip (not shown).

First, when a call of the terminal is started, current position information of the antenna is determined and an internal timer (not shown) is driven (S101).

Next, the strength (RSSI_i) of the received signal at the position (i) is detected (S102).

If the detected intensity RSSI_i of the received signal is equal to or greater than a predetermined reference value Pr within a predetermined timer time S105 (S103), the controller determines that the signal is in a stable state and fixes the current antenna position (S104).

However, if the detected intensity RSSI_i of the received signal is less than or equal to the predetermined reference value Pr within the predetermined timer time S105 (S103), power is supplied to the driving means (motor) (S106), and the antenna moves properly. The position is calculated (S107), and the position of the antenna is moved (S108).

When the operation is completed, the internal timer is initialized (S109), and the above processes (S102 to S108) are repeated.

At this time, the step (S107, S108) of calculating and moving the proper moving position of the antenna can be used when the experimental data is mapped in advance, and if there is no mapping data, the antenna is moved in a predetermined unit. The reference signal Pr is fixed at a position where the intensity RSSI of the received signal detected at the position is equal to or greater than the predetermined reference value Pr.

If there is no place above the predetermined reference value Pr at any position, the antenna is moved to the place having the highest value among the intensity RSSI of the received signal detected until then.

In other words, the present invention checks the received signal while moving the antenna by an appropriate length each time the strength of the received signal in the receive path checked at regular intervals weakens, and finds an optimal position among them to fix the antenna. Algorithm how to make it.

For reference, SAR is based on the initial position of the antenna. When moving along an inverted U-shaped movement path mechanism, the SAR decreases sufficiently according to the angle of inclination.

In other words, assuming that the antenna moves while tracking it according to the strength of the received signal, the SAR can always be improved compared to the initial default position.

As described above, the movable antenna device of the mobile communication terminal and the control method thereof allow the antenna mounted on the terminal to be controlled to be movable so that the reception rate can be improved, and the SAR is reduced. It is effective to reduce the effect of electromagnetic waves on the human body.

The present invention has an effect of changing the position of the antenna according to the direction of the mobile communication terminal, thereby improving the performance of reception sensitivity and reducing the effect of electromagnetic waves (SAR) on the human body.

Claims (5)

Control means for detecting the strength of the received signal and generating an appropriate antenna position control signal accordingly; A curved movement path mechanism capable of attaching an antenna and moving simultaneously in a horizontal or vertical direction; Connecting means attached to the antenna to move the antenna through a movement path mechanism; Moveable by the position control signal of the control means is driven forward or reverse rotation, comprising a drive means for moving the antenna attached to the movement path mechanism in a horizontal or vertical direction movable of the mobile communication terminal, characterized in that Antenna device. The movable antenna of claim 1, wherein the moving path mechanism for moving the antenna is made of a lead screw made of a flexible material or a fan belt to give a predetermined curvature. Device. The antenna device of claim 1, wherein the antenna is mounted on a rear surface of the LCD and configured to maintain a predetermined angle, not horizontal or vertical, with respect to the ground surface. In the antenna control method capable of moving the position of the antenna in a horizontal or vertical direction, Determining location information of a current antenna when a call of the terminal is started; Detecting an intensity (RSSI_i) of the received signal at the position (i); Determining that the signal is in a stable state when the strength of the received signal RSSI_i is equal to or greater than a predetermined reference value Pr, and fixing the position of the current antenna; If the strength of the received signal at the moved position is less than a predetermined reference value, repeating the above steps to move the antenna to a position where the strength of the received signal is greater than the reference value, characterized in that the mobile antenna control method of the mobile communication terminal . The method of claim 4, wherein the moving of the antenna to an appropriate position comprises: mapping experimental data of the antenna position according to the received signal strength, and when the detected received signal strength is less than or equal to a predetermined reference value, the mapped value. Movable antenna control method of a mobile communication terminal, characterized in that for moving the antenna to a corresponding position.