KR20070014854A - Antenna-detachable mobile communication terminal and method for attachingg/detaching planar inverted f-antenna - Google Patents

Abstract

A mobile communication terminal with a detachable planar inverted F-antenna and a method of attaching/detaching the antenna are provided to minimize a power consumption of the terminal by interrupting power of the process related to the calling by detaching the antenna from the terminal. An antenna has a ground(242) to be grounded when being attached to a mobile communication terminal, an RF signal part(244) receiving an RF signal, and an antenna flat portion(246). A microprocessor(210) recognizes a voltage of a detection terminal to discriminate a high signal and a low signal, and turns on/off a power of a processor according to the high signal or the low signal. A high resistor(220) is connected to a bias voltage at one end thereof and is connected to the detection terminal of the microprocessor at the other end. A low resistor(222) is connected to the detection terminal at one end thereof and the other end is shorted if the antenna is attached to the mobile communication terminal.

Description

Method for attaching and detaching a PIA type antenna and an antenna detachable mobile communication terminal using the same {Antenna-Detachable Mobile Communication Terminal And Method for Attachingg / Detaching Planar Inverted F-Antenna}

1 is a rear view of an antenna detachable mobile terminal for attaching and detaching an antenna of a PIFA type according to an embodiment of the present invention;

2 is a block diagram of a circuit using a detachable external PIFA type antenna according to a preferred embodiment of the present invention;

3 is a flowchart illustrating an operation of a mobile communication terminal for attaching and detaching an PIFA type antenna according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

210: microprocessor 212: switch

220: high resistance 222: low resistance

230: duplexer 240: antenna

242: ground portion 244: RF signal portion

246: antenna plane

The present invention relates to a method for attaching and detaching an PIFA type antenna and an antenna detachable mobile communication terminal using the same. More specifically, if you want to use camera, game and MP3 playback functions other than voice call function in mobile communication terminal, if you remove PIFA type antenna from mobile communication terminal, power of processor related to call is cut off. A method for attaching and detaching a PIFA type antenna that minimizes power consumption and an antenna detachable mobile communication terminal using the same are provided.

Antennas are defined as 'A Usually Metallic Device for Radiating or Receiving Radio Waves'. That is, the antenna may be defined as a kind of energy conversion device that radiates or receives electromagnetic waves. Electromagnetic waves consist of an electric field and a magnetic field, and its substance is formed of a group of photons. Therefore, the transmitting antenna can be a radiant energy converter that sends high frequency alternating current to the antenna and blows electromagnetic waves properly in the required direction, and the receiving antenna is the opposite concept.

Wireless communication, which exchanges information with a moving party, is called a mobile communication. Unlike fixed communication, mobile communication has many features, and the antenna used is often designed in a different concept from that of fixed communication. Of course, the antenna element to be used is not changed, but the antenna for mobile communication is designed in consideration of mutually correlated with the conditions suitable for the mobile environment, the conditions of radio wave transmission and the conditions required for the communication system.

As the technology related to the mobile communication terminal has developed, the antenna technology of the mobile communication terminal has also developed. Monopole antenna is mainly used as an antenna for a mobile communication terminal. The characteristics of the monopole antenna attached to the mobile communication terminal vary depending on the shape, dimensions and attachment position of the monopole antenna. The basics of the original antenna element selection depend on the circuit design of the communication system. In addition to the frequency bandwidth, transmit power, receive sensitivity, and communication quality, the gain of the required antenna is determined and, conversely, the gain of the antenna is determined and then other parameters are determined. In the case of mobile communication, the state of radio wave propagation generally has irregular and complicated time fluctuations. Moreover, due to changes in the interference or noise environment, the margin of the indeterminate factor is large in the circuit design. Antennas for mobile communication must consider various parameters of radio wave propagation and environment according to spatial and temporal variation.

Since the mobile communication antenna is used in a mobile communication terminal, it must be compact and lightweight, and has a characteristic of coping with interference or multi-path fading associated with movement in the radio wave environment. It should be designed considering the condition of service range and frequency reuse. Furthermore, mobile communication antennas are designed to withstand changes in environmental conditions based on movement and to take into account the effects of proximity effects by objects proximate to the antenna element.

On the other hand, the miniaturization of mobile communication terminals has advanced with the use of semiconductor devices, and accordingly, miniaturization of antennas is also required. In general, the smaller the antenna element, the lower the radiation efficiency and the narrower the bandwidth. Even if the size of the mobile communication terminal is not deteriorated, the performance should not be deteriorated. Therefore, it is necessary to develop an antenna that does not deteriorate even if it is miniaturized. The antenna used in the mobile communication terminal treats the 'body + antenna element' as one antenna system because a part of the main body operates as a radiator due to the proximity effect.

The multipath propagation due to the distance characteristic by the moving object, the change of the incident wave direction, the reflection and the diffraction by the feature is a unique phenomenon of mobile communication. Thermal noise and the degree of interference are related to the determination of transmission power and coverage, which are basic parameters in circuit design. Setting the receive power determines the gain of the required antenna, but how to shape and control the radiation pattern in relation to interference. In this case, measures are taken to reduce as much as possible the fluctuations in the received electric field strength due to the multipath propagation of radio waves and the deterioration in communication quality. For this reason, introduction of a diversity system and an active antenna is considered.

In the propagation environment of mobile communication, the reception level is characterized by temporal fluctuations as well as the spatial distribution of the electromagnetic field, and it is necessary to design the antenna system in consideration of many parameters such as distance characteristics, interference reduction, and fading reduction.

Digital modulation schemes are gradually increasing, which reduces the time delay difference of multiple waves, and forms or controls a radiation pattern in which communication quality is not degraded. The diversity scheme is one of them. When information media is voice, it is not a problem, but when a large amount and high speed information transmission is required at a small bit error rate (BER), a higher performance antenna system is required.

In the case of a mobile communication terminal, changes in temperature, humidity, vibration, and shock may not be maintained. Antennas require physical strength to withstand these environmental conditions. Since the antenna is particularly fragile, it should be made of a flexible material and structure that is not easily embedded or attached to the mobile communication terminal. Problems with environmental conditions are the effects of irregular propagation and proximity effects. In particular, the proximity effect is a phenomenon in which the characteristics of the antenna are changed due to coupling with an object around the antenna element, and is caused by radiated current induced in the proximity object. Due to this phenomenon, the antenna characteristics deteriorate, so it is designed in the direction of suppressing degradation as much as possible.

In general, the effects of the proximity effect change the radiation pattern or impedance characteristics, resulting in gain reduction and matching variation. In addition, since the radiation current of the antenna due to the proximity object is often three-dimensional distribution, the radiation pattern or polarization component should be analyzed in three-dimensional space.

The basic model of the antenna of the mobile communication terminal is a dipole antenna composed of a half-wave resonant length for a frequency used. Assuming that the ground plane is close to a perfect conductor, the monopole antenna using 1/4 wavelength is surrounded by a coating material and is mostly used as a mobile terminal antenna.

Antennas of mobile communication terminals are largely classified into an external type and an internal type.

External antennas include Retractable / Whip, Helical, and Stubby antennas, which are adopted by most mobile communication terminals and use a combination of two antennas suitable for signal waiting and call status. While the external antenna has a simple structure, it protrudes outside of the mobile communication terminal, thereby limiting the design of the outside of the mobile communication terminal.

Built-in antennas include ceramic, PCB type, and PIFA type antennas. The mobile communication terminal with a built-in antenna is compact and lightweight, and the manufacturing process of the mobile communication terminal is easy and the price is low. However, since the built-in antenna is attached to the inside of the mobile communication terminal, the gain is decreased and the reception sensitivity is deteriorated, so that the antenna characteristics may change due to the coupling effect with the internal elements of the mobile communication terminal. However, in terms of design, it is difficult to find a differentiating factor in the performance of the mobile communication terminal.

Among the built-in antennas, PIFA (Planar Inverted F-Antenna) type antenna has been spotlighted in the trend of the design of the mobile terminal antenna to a flat structure with a simple manufacturing process, while the mobile terminal has been compactly improved through multi-layer structure and modularization. Is getting. The PIFA type antenna has a resonant structure that minimizes reactance by shorting one side of the radiator and opening the other side to form a proper length in the feed direction. Installation at a suitable height on the ground plane is effective in lowering the SAR (Specific Absorption Rate) value.

On the other hand, as the spread of mobile communication terminals has recently expanded, user needs have also diversified. Therefore, technology development has been carried out to perform various additional service functions such as a short message service in addition to the unique call function of the mobile communication terminal. These mobile communication services are being expanded to use wireless internet services and contents for mobile communication terminals following basic voice calls, text and voice message transmissions. Among them, the wireless Internet service can be used by connecting to a server on the Internet to obtain necessary information by using the Internet, as well as by downloading and storing wireless Internet contents such as various images, ringtones, and games wirelessly or executing them in real time. To be able.

Recently, the use of mobile communication terminals includes many functions in addition to voice calls. There may be a request from the user that the voice call function of the mobile communication terminal does not work while the camera, game, and MP3 playback function is executed in the mobile communication terminal. The voice call function may be used while using the camera, game, and MP3 playback function. Stopping the battery consumption of the mobile communication terminal can be reduced.

However, in the existing mobile communication terminal, it is not possible to reduce the battery consumption by maintaining the voice call function while executing the camera, game and MP3 playback functions, and the antenna part protrudes outside the mobile communication terminal to limit the design limitations of the mobile communication terminal. Giving a problem.

In order to solve the above problems, the present invention, if you want to use the camera, game and MP3 playback functions other than the voice call function in the mobile communication terminal, if the antenna of the PIFA type is removed from the mobile communication terminal power of the processor associated with the call It is an object of the present invention to provide a method of attaching and detaching an antenna of a PIFA type that minimizes power consumption of a mobile communication terminal, and an antenna detachable mobile communication terminal using the same.

According to a first object of the present invention, when a mobile communication terminal wants to use an additional function including a camera, a game, and an MP3 playback function other than a voice call function, the antenna of a Planar Inverted F-Antenna (PIFA) type is moved. An antenna detachable mobile communication terminal detachably attaching a PIFA type antenna that disconnects power from a processor related to communication when disconnected from a communication terminal, wherein the ground unit is grounded when it is attached to the mobile communication terminal, and an RF signal unit receiving an RF signal And an antenna comprising an antenna plane portion; A microprocessor recognizing a voltage of a sensing terminal and classifying the signal into a high signal or a low signal, and turning off or on the power of the call-related processor according to the high signal or the low signal; A high resistance connected at one end to the bias voltage and at the other end to the sense terminal of the microprocessor; And one end connected to the sensing terminal of the microprocessor and the other end shorted when the PIFA type antenna is attached to the mobile communication terminal and opened when the PIFA type antenna is detached from the mobile communication terminal. An object of the present invention is to provide an antenna detachable mobile communication terminal detachably attaching a PIFA type antenna comprising a resistor.

According to a second object of the present invention, when attached to a mobile communication terminal, the ground unit grounded, an RF signal unit for receiving an RF signal and an antenna including an antenna plane, a high signal or a low signal by recognizing the voltage of the sensing terminal A microprocessor configured to turn off or on the power of the call-related processor according to the high signal or the low signal; A high resistance connected at one end to the bias voltage and at the other end to the sense terminal of the microprocessor; And one end connected to the sensing terminal of the microprocessor and the other end shorted when the PIFA type antenna is attached to the mobile communication terminal and opened when the PIFA type antenna is detached from the mobile communication terminal. If you want to use an additional function including a camera, a game, and an MP3 playback function other than a voice call function in the mobile communication terminal including a resistor, a antenna of a Planar Inverted F-Antenna (PIFA) type is separated from the mobile communication terminal. A method of using an antenna detachable mobile terminal for attaching and detaching a PIFA type antenna that cuts off a power of a call related processor associated with the voice call function, the method comprising: (a) determining whether the PIFA type antenna is attached or detached; (b) opening the low resistance when it is determined in step (a) that the antenna of the PIFA type is detached; (c) applying a high signal to the sensing terminal because the low resistance is opened so that no voltage drop occurs; And (d) recognizing the high signal of the sensing terminal and turning off a power of the call-related processor. 2. The purpose is to provide.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a rear view of an antenna detachable mobile terminal for attaching and detaching a PIFA type antenna according to a preferred embodiment of the present invention.

As shown in FIG. 1, an antenna detachable mobile communication terminal 100 that attaches and detaches an antenna of the PIFA type includes an external antenna 110 of the PIFA type having a detachable connection structure. The detachable external PIFA type antenna 110 includes a ground portion 112, an RF signal portion 114, and an antenna plane portion 116.

The antenna-separated mobile communication terminal 100 that attaches and detaches the PIFA type antenna may be a slide type or a folder type. The antenna detachable mobile communication terminal 100 for attaching and detaching a PIFA type antenna has the same connection structure as the structure for attaching and detaching a battery so that the mobile communication terminal 100 can be detached when using a camera, a game, and an MP3 playback function. Is designed. For example, in the case of a mobile terminal in which a camera function is highlighted, the antenna has a design and shape similar to that of a real camera. It is designed to be shaped to give an advantage in handling and carrying.

2 is a block diagram of a circuit using a detachable external PIFA type antenna according to a preferred embodiment of the present invention.

As shown in FIG. 2, a circuit using a detachable external PIFA type antenna according to a preferred embodiment of the present invention includes a microprocessor 210, a high resistance 220, a low resistance 222, a duplexer 230. ), A grounding unit 242, an RF signal unit 244, and an antenna plane 246.

The microprocessor 210 recognizes a voltage of a sensing terminal (not shown) and divides the signal into a high or low signal, and turns off or on a power of a processor related to a call according to a high or low signal. Here, the call-related processor refers to a kind of microprocessor dedicated to functions related to voice call and data communication among the functions of the mobile communication terminal.

The high resistance 220 is 100 kΩ, one end of which is connected to the bias voltage Vcc and the other end of which is connected to the sensing terminal of the microprocessor.

The low resistance 222 is 10 kΩ, one end of which is connected to the sensing terminal of the microprocessor, the other end of which is grounded when the PIFA type antenna is attached, and opened when the PIFA type antenna is detached.

The duplexer 230 serves to separate the transmitter and the receiver while using the same antenna. In the mobile communication terminal using one antenna because the transmission frequency and the reception frequency are the same, the duplexer 230 uses a band pass filter (BPF) that passes only the transmitter frequency and a BPF that passes only the receiver frequency, and the middle of the duplexer 230 is separated from the antenna. Match them properly.

The grounding part 242 is grounded when the PIFA type antenna is attached to the mobile communication terminal.

The RF signal unit 244 receives an RF signal from the outside and transmits the RF signal to the duplexer 230.

3 is a flowchart illustrating an operation of a mobile communication terminal for attaching and detaching an PIFA type antenna according to an exemplary embodiment of the present invention.

It is determined whether the PIFA type antenna 240 is detached or attached from the mobile communication terminal (S310).

If the antenna is detached in step S310, the low resistance 222 is opened (S320).

When the low resistance 222 is opened in step S320, a voltage drop does not occur, and a high voltage, that is, a high signal is applied to the sensing terminal (S322).

The microprocessor 210 that recognizes the high signal of the sensing terminal turns on the power of the call-related processor (S324).

On the other hand, if it is determined in step S310 that the antenna is detached from the mobile communication terminal, the low resistance 222 is short-circuited (S340).

In step SS320, the low resistance 222 is short-circuited and a current flows in the high resistance 220 to generate a voltage drop, and a low voltage, that is, a low signal is applied to the sensing terminal (S342).

The microprocessor 210 that recognizes the low signal of the sensing terminal turns off the power of the call-related processor (S344).

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, when using a camera, a game, and an MP3 playback function other than the voice call function in the mobile communication terminal, the antenna of the PIFA type is disconnected from the mobile communication terminal to cut off the power of the call-related processor. This minimizes the power consumption of the mobile communication terminal.

Claims (12)

If a mobile communication terminal wants to use an additional function including a camera, a game, and an MP3 playback function other than a voice call function, the antenna of the Planar Inverted F-Antenna (PIFA) type is separated from the mobile communication terminal. In the antenna-separated mobile communication terminal detachable attaching a PIFA type antenna for cutting off the power, An antenna including a ground part which is grounded when attached to the mobile communication terminal, an RF signal part which receives an RF signal, and an antenna plane part; A microprocessor recognizing a voltage of a sensing terminal and classifying the signal into a high signal or a low signal, and turning off or on the power of the call-related processor according to the high signal or the low signal; A high resistance connected at one end to the bias voltage and at the other end to the sense terminal of the microprocessor; And One end is connected to the sensing terminal of the microprocessor and the other end is short-circuited when the PIFA type antenna is attached to the mobile communication terminal and low resistance opened when the PIFA type antenna is detached from the mobile communication terminal. A detachable antenna for detachable antenna, comprising a PIFA type antenna, characterized in that it comprises a. The method of claim 1, The microprocessor turns off the power of the call-related processor when it recognizes the high signal of the sensing terminal, and turns on power of the call-related processor when the microprocessor recognizes the low signal of the sensing terminal. An antenna detachable mobile communication terminal for attaching and detaching an antenna of a PIFA type. The method of claim 1, And the low resistance is opened when the PIFA type antenna is detached, and shorted when the PIFA type antenna is attached. The method of claim 1, A detachable mobile communication terminal for attaching and detaching a PIFA type antenna, wherein the ratio of the resistance between the high resistance and the low resistance is 5: 1 to 15: 1. The method of claim 1, The PIFA type antenna detachable mobile communication terminal detachable detachable antenna of the PIFA type, characterized in that detachable when using the additional function in the mobile communication terminal. The method of claim 1, The PIFA-type antenna detachable antenna for detachable antenna of the PIFA type, characterized in that the removable detachable to the slider and folder-type mobile communication terminal. The method of claim 1, The mobile communication terminal detachable antenna detachable mobile communication terminal further comprising a PIFA type antenna, characterized in that it further comprises a duplexer for transmitting and receiving a frequency by separating the transmitting end and the receiving end using the antenna. The method of claim 1, The call-related processor detachable antenna for detachable mobile communication terminal of the PIFA type, characterized in that dedicated to the function related to voice call and data communication among the functions provided by the mobile communication terminal. When attached to a mobile communication terminal, the ground unit grounded, an RF signal unit for receiving an RF signal, and an antenna including an antenna plane unit, and recognizes the voltage of the sensing terminal and divided into a high signal or a low signal, the high signal or the A microprocessor that powers off or on the call-related processor in response to a low signal; A high resistance once connected to this bias voltage and the other end connected to the sense terminal of the microprocessor; And one end connected to the sensing terminal of the microprocessor and the other end shorted when the PIFA type antenna is attached to the mobile communication terminal and opened when the PIFA type antenna is detached from the mobile communication terminal. If you want to use an additional function including a camera, a game, and an MP3 playback function other than a voice call function in the mobile communication terminal including a resistor, a antenna of a Planar Inverted F-Antenna (PIFA) type is separated from the mobile communication terminal. In the method using an antenna detachable mobile communication terminal for attaching and detaching the PIFA type antenna for shutting off the power of the call-related processor associated with the voice call function, (a) determining whether the PIFA type antenna is attached or detached; (b) opening the low resistance when it is determined in step (a) that the antenna of the PIFA type is detached; (c) applying a high signal to the sensing terminal because the low resistance is opened so that no voltage drop occurs; And (d) recognizing the high signal of the sensing terminal and turning off the call-related processor; Method of using an antenna-separated mobile communication terminal detachable detachable, characterized in that it comprises a PIFA type antenna. The method of claim 9, In the step (a), when it is determined that the antenna of the PIFA type is attached, the low resistance is short-circuit method using an antenna detachable mobile communication terminal detachable. The method of claim 10, When the low resistance is short-circuited, the voltage drop occurs and a current flows through the high resistance, so that a low signal is applied to the sensing terminal. The method of claim 11, And the microprocessor recognizes the low signal of the sensing terminal and turns on the power of the call-related processor.

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