KR20100102904A

KR20100102904A - Portable terminal having decrease function of specific absorption rate and method for decreasing of specific absorption rate

Info

Publication number: KR20100102904A
Application number: KR1020090021209A
Authority: KR
Inventors: 정윤형
Original assignee: 주식회사 케이티테크
Priority date: 2009-03-12
Filing date: 2009-03-12
Publication date: 2010-09-27

Abstract

PURPOSE: A portable terminal with a function of decreasing an absorption rate of an electromagnetic wave and a method for reducing an absorption rate of an electromagnetic wave of a portable terminal are provided to compare measured illuminance with a preset threshold value, thereby switching an electric signal route into one of the first and second antennas based on the comparison result. CONSTITUTION: The first antenna(152) includes an omni directional pattern of emitting an electromagnetic wave. The second antenna(154) includes a directional pattern of emitting an electromagnetic wave. An illuminance sensor(110) measures illuminance and provides the measured illuminance. A controller(120) provides a switching control signal for switching an electric signal route into one of the first and second antennas based on the comparison result.

Description

Portable terminal having Decrease Function Of Specific Absorption Rate And Method For Decreasing Of Specific Absorption Rate

The present invention relates to a portable terminal, and more particularly, to a portable terminal having a function of reducing the electromagnetic wave absorption rate which can reduce the electromagnetic wave absorption rate absorbed by the human body when using the portable terminal and a method of reducing the electromagnetic wave absorption rate of the portable terminal.

Portable terminals include mobile phones, personal digital assistants (PDAs), portable multimedia players (PMPs), and ultra mobile personal computers (UMPCs).

In general, electromagnetic wave noise is unwanted electromagnetic energy. Most electronic devices produce electromagnetic noise with varying degrees, and the generated electronic energy interferes with other devices through any medium.

As mentioned above, an electromagnetic interference on other equipment is called an active obstacle. On the other hand, most electronic devices are disturbed by electromagnetic noise from the outside.

The electromagnetic noise as described above directly affects a specific absorption rate (SAR). The electromagnetic wave absorption rate refers to a numerical value indicating how much electromagnetic waves emitted from the portable terminal are absorbed by the human body.

That is, the electromagnetic wave absorption rate is the electromagnetic wave absorption power per unit mass absorbed by the human body when using a portable terminal. Since a large measured value may adversely affect the human body, countries have regulated that the electromagnetic wave absorption rate to the human body does not exceed the reference value.

However, since an antenna provided in a general portable terminal has an omni directional radiation pattern, the radiation pattern is distributed to the opposite direction of the human body and the human body when the portable terminal is used, so that the absorption rate (SAR) of the human body is increased. There is a problem.

It is a first object of the present invention to provide a portable terminal having a function of reducing the electromagnetic wave absorption rate which can reduce the electromagnetic wave absorption rate when the portable terminal is used.

Another object of the present invention is to provide a method for reducing electromagnetic wave absorption of a portable terminal, which can reduce the electromagnetic wave absorption rate when the portable terminal is used.

According to an aspect of the present invention, a portable terminal having a function of reducing electromagnetic wave absorptivity according to an aspect of the present invention includes a radiation pattern of electromagnetic waves radiated in omni directional directions. 1 antenna, a second antenna having a radiation pattern of electromagnetic radiation radiated directionally, an illuminance sensor measuring illuminance and providing a measured illuminance value, comparing the provided illuminance value with a preset threshold value, based on the compared result A control unit providing a switching control signal for switching an electrical signal path to any one of the first antenna and the second antenna; And

And a switching unit configured to switch an electrical signal path to any one of the first antenna and the second antenna based on the control of the controller. The control unit, when the provided illuminance value is less than the predetermined threshold value, the switching control signal for switching the electrical signal path from the first antenna having an omnidirectional radiation pattern to the second antenna having a directional radiation pattern Can be provided. The control unit may connect an electrical signal path to the first antenna having an omnidirectional radiation pattern when the provided illuminance value is greater than the preset threshold value.

In addition, the method for reducing the electromagnetic wave absorption rate of a portable terminal according to an aspect of the present invention for achieving the second object of the present invention, the step of receiving a measured illuminance value, the provided illuminance value and a predetermined threshold value Switching the electrical signal path to either one of the first antenna and the second antenna based on the comparing and the compared result. Switching the electrical signal path to either one of the first antenna and the second antenna based on the result of the comparison may have an omnidirectional radiation pattern when the provided illuminance value is less than the preset threshold. An electrical signal path may be switched from the first antenna to the second antenna having a directional radiation pattern. Switching the electrical signal path to either one of the first antenna and the second antenna based on the result of the comparison may have an omnidirectional radiation pattern when the provided illuminance value is greater than the preset threshold. An electrical signal path may be connected to the first antenna.

According to the method for reducing the electromagnetic wave absorption rate of a portable terminal having a function of reducing the electromagnetic wave absorption rate as described above, when the portable terminal approaches the head of the user when the portable terminal is used, the illuminance value measured by measuring the illuminance is set in advance to a threshold value. In comparison with, switch the electrical signal path to either one of the first antenna and the second antenna based on the compared result.

Therefore, it is determined whether the portable terminal is close to the human body through the illuminance sensor, and when the portable terminal is close to the human body, when the portable terminal is close to the human body, the radiation pattern is switched from the first antenna having the omnidirectional radiation pattern to the second antenna having the directional radiation pattern. By changing the direction to not be absorbed by the human body can reduce the electromagnetic wave absorption rate absorbed by the human body.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

1 is a block diagram illustrating a configuration of a portable terminal having a function of reducing electromagnetic wave absorption rate according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a portable terminal having a function of reducing an electromagnetic wave absorption rate according to an embodiment of the present invention may include an illumination sensor 110, a controller 120, a wireless transceiver 130, a switching unit 140, and a second terminal. The first antenna 152, the second antenna 154, the touch screen 160, the storage unit 170, the microphone 180, and the speaker 190 may be included.

The illuminance sensor 110 measures illuminance and provides the measured illuminance value to the controller 120. The illuminance sensor 110 may be installed around a speaker of the portable terminal, and the controller 120 measures the illuminance that changes as the portable terminal approaches the human body and provides the control unit 120 to determine whether the portable terminal is close to the human body. To judge.

The controller 120 receives the illuminance value provided by the illuminance sensor 110, compares the provided illuminance value with a preset threshold value, and when the provided illuminance value is smaller than the preset threshold value, the first antenna 152 generates a first illuminance value. The switching unit 140 provides a switching control signal for switching an electrical signal path to the two antennas 154.

Here, the controller 120 switches the electrical signal path from the first antenna 152 having the radiation pattern in all directions to the second antenna 154 having the directional radiation pattern so that the direction in which electromagnetic waves are radiated is opposite to the human body. By changing the radiation pattern to the direction can reduce the absorption rate of electromagnetic waves absorbed by the human body.

Alternatively, when the provided illuminance value is larger than a preset threshold value, the controller 120 determines that the portable terminal is not in proximity to the human body and maintains the electrical signal path of the first antenna. That is, when the portable terminal is not close to the human body, the first antenna having the omnidirectional radiation pattern is basically operated.

The wireless transceiver 130 may include a duplexer, a high frequency processor, and an intermediate frequency processor. The wireless transceiver 130 may receive a radio frequency (RF) signal induced in an antenna ANT provided from the switching unit 140 through a duplexer. After converting the received radio frequency signal into an intermediate frequency (Intermediate Frequency) and converts it back to a baseband (baseband) signal to provide to the control unit 120, and converts the baseband signal provided from the control unit 120 to an intermediate frequency After that, the intermediate frequency signal may be converted into a wireless high frequency signal and provided to the switching unit 140 through a duplexer.

The switching unit 140 may be connected between the wireless transceiver 130, the first antenna 152, and the second antenna 154. Here, the switching unit 140 receives a switching control signal from the control unit 120 and performs a switching operation to change an electrical signal path so that any one of the first antenna 152 and the second antenna 154 is To work.

The first antenna 152 and the second antenna 154 are connected to the switching unit 140 by a switching operation for connecting the electrical signal path from the switching unit 140, the first antenna 152 is omni-directional ( Omni Directional) radiation pattern, and the second antenna 154 may have a directional radiation pattern.

As illustrated in FIG. 1, the portable terminal according to an embodiment of the present invention has been illustrated as an example in which two first antennas 152 and a second antenna 154 are configured. More than one antenna may be configured and each antenna may have different directivity to reduce the electromagnetic wave absorption rate.

The touch screen 160 controls the control unit 120 in the form of a combination of a touch pad and a display device such as a liquid crystal display (LCD) or an organic light emitting diode (OLED). The controller displays the user interface such as a menu or a button of the portable terminal and an operation state of the portable terminal based on the control unit, and provides an event signal corresponding to the touch input input by the user to the controller 120.

As illustrated in FIG. 1, the portable terminal according to the exemplary embodiment of the present invention has a touch screen 160 configured as an example. However, in another exemplary embodiment of the present invention, an input and a display unit 162 having a display function are performed. Each key input unit 164 may function as an independent unit.

The storage unit 170 may be configured of a nonvolatile memory such as random access memory (RAM) and / or flash memory, electrically erasable and programmable read only memory (EEPROM), etc., and is required for the basic operation of the portable terminal. Data generated by programs (eg, operating systems) and other applications and / or users may be stored.

The microphone 180 receives a voice of a user, that is, a caller, during a voice call, converts the voice into an electrical signal, and provides the converted signal to the controller 120. The speaker 190 receives a voice signal of a voice call counterpart decoded by a voice codec (not shown) and outputs it as a signal of an audible frequency band.

2 is a flowchart illustrating a method for reducing electromagnetic wave absorption of a portable terminal according to an exemplary embodiment of the present invention. When the power of the portable terminal is applied, it is assumed that an electrical signal path is connected to the first antenna among the first antenna having the omnidirectional radiation pattern and the second antenna having the directional radiation pattern.

Referring to FIG. 2, the controller 120 receives an illuminance value from the illuminance sensor 110 (step 201), compares the provided illuminance value with a preset threshold value, and determines whether the provided illuminance value is smaller than a preset threshold value. It is determined (step 203).

In step 203, when it is determined that the provided illuminance value is smaller than the preset threshold value, it means that the portable terminal is close to the human body, and thus the control unit 120 controls the directivity of the first antenna 152 having the omnidirectional radiation pattern. The electrical signal path is switched to a second antenna 154 having a radiation pattern (step 205).

Thereafter, the controller 120 determines an event indicating power off (step 207). Here, the user may determine an event for instructing power termination by pressing a predetermined end button of the portable terminal.

In step 207, if an event indicating power off does not occur, the controller 120 continues to perform steps 201 and 205.

Alternatively, when it is determined that the illuminance value provided in step 203 is not smaller than the preset threshold value, it means that the portable terminal is not close to the human body, and thus the controller 120 is connected to the first antenna having the omnidirectional radiation pattern. Maintain an electrical signal path (step 209).

3 is a perspective view showing in detail the antenna provided in the portable terminal shown in FIG.

Referring to FIG. 3, the antenna provided in the portable terminal may have a first antenna 152 installed on the carrier 310 as shown in FIG. The second antenna 154 may be installed at a distance.

The first antenna 152 and the second antenna 154 are electrically connected to a radio frequency (RF) related device (eg, a duplexer) installed in the main printed circuit board (PCB) 320.

3B is a perspective view illustrating a portable terminal having a first antenna and a second antenna illustrated in FIG. 3A, wherein the portable terminal is close to the head of the user during a call. 152 and the distance between the second antenna 154 and the user.

4 illustrates a radiation pattern of an antenna provided in a portable terminal according to an exemplary embodiment of the present invention. FIG. 4A illustrates a radiation pattern of the first antenna 152 and FIG. 4B illustrates a radiation pattern of the antenna. 2 shows the radiation pattern of the antenna 154.

Referring to FIG. 4, as shown in FIG. 4A, since the first antenna 152 has a radiation pattern of electromagnetic waves radiated in omni directional directions, electromagnetic waves are generated when the portable terminal is used. It is directed to a part of the human body may increase the absorption rate (SAR) absorbed by the human body.

As shown in (b) of FIG. 4, since the second antenna 154 has a radiation pattern of electromagnetic waves radiated in the opposite direction of the human body, when the portable terminal is used, the radiation pattern is directed in the opposite direction of the human body and absorbed by the human body. The electromagnetic wave absorption rate SAR can be reduced.

Therefore, the portable terminal according to an embodiment of the present invention changes the operating antenna from the first antenna 152 to the second antenna 154 when the portable terminal is close to the head of the user, thereby absorbing the electromagnetic wave absorbed by the human body. SAR can be reduced.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

2 is a flowchart illustrating a method for reducing electromagnetic wave absorption of a portable terminal according to an exemplary embodiment of the present invention.

Figure 4 shows the radiation pattern of the antenna provided in the portable terminal according to an embodiment of the present invention.

110: illuminance sensor 120: control unit

130: wireless transceiver 140: switching unit

152: first antenna unit 154: second antenna unit

160: touch screen 170: storage unit

180: microphone 190: speaker

Claims

A first antenna having a radiation pattern of electromagnetic waves radiated in omni directional directions;

A second antenna having a radiation pattern of electromagnetic waves radiated directionally;

An illuminance sensor measuring illuminance and providing a measured illuminance value;

A control unit comparing the provided illuminance value with a preset threshold value and providing a switching control signal for switching an electrical signal path to any one of the first antenna and the second antenna based on the compared result; And

And a switching unit configured to switch an electrical signal path to any one of the first antenna and the second antenna based on the control of the controller.

The method of claim 1, wherein the control unit,

When the provided illuminance value is less than the preset threshold, providing a switching control signal for switching an electrical signal path from the first antenna having an omnidirectional radiation pattern to the second antenna having a directional radiation pattern. A portable terminal having a function of reducing the electromagnetic wave absorption rate.

The method of claim 1, wherein the control unit,

And the electrical signal path is connected to the first antenna having an omnidirectional radiation pattern when the provided illuminance value is larger than the preset threshold value.

Receiving a measured illuminance value;

Comparing the provided illuminance value with a preset threshold value; And

And switching the electrical signal path to either one of the first antenna and the second antenna based on the result of the comparison.

The method of claim 4, wherein the switching of the electrical signal path to one of the first antenna and the second antenna based on the compared result comprises:

And when the provided illuminance value is smaller than the preset threshold, switching an electrical signal path from the first antenna having an omnidirectional radiation pattern to the second antenna having a directional radiation pattern. Method of reducing electromagnetic wave absorption.