KR20090106694A - Adaptive multi-band internal antenna for decreasing human-body effect - Google Patents

Abstract

PURPOSE: An adaptive multi-band internal antenna for decreasing the influence on a human body is provided to reduce a size of a terminal by not requiring an additional antenna space. CONSTITUTION: An adaptive multi-band internal antenna includes a first radiator(10) and a second radiator(20). The first radiator is formed on a printed circuit board(5) of the terminal and operates in a dual band. The second radiator is pattern-printed to be separated from the first radiator. The second radiator is coupled and fed by the first radiator. The first radiator is formed in the lower part of the printed circuit board of the terminal. The printed pattern radiator is formed in the upper part of the bottom of the printed circuit board opposite to the position of the dual band radiator.

Description

ADAPTIVE MULTI-BAND INTERNAL ANTENNA FOR DECREASING HUMAN-BODY EFFECT}

The present invention relates to an adaptive multi-band internal antenna for reducing the effects of the human body, and in detail, is printed on a printed circuit board of a terminal and pattern-printed so as to be spaced apart from the first radiator operating in a dual band by a predetermined distance, and coupled by the first radiator. The present invention relates to an adaptive multi-band internal antenna for reducing human impact having a ring-feeding second radiator to optimize data transmission and reduce human impact.

Recently, as the use of mobile communication terminals such as mobile phones has rapidly increased, interest and concern due to electromagnetic waves emitted from mobile communication terminals have increased. In response to the growing concern about human effects, international organizations have specified the specific absorption rate (SAR) of the human body as a standard, and the US FCC has regulated the human body's electromagnetic absorption rate since 1997. Therefore, it is urgent to prepare countermeasures.

One of the technologies for reducing the human body influence on electromagnetic waves is a method of reducing the influence on the human body by blocking electromagnetic waves by using a conductive material in the terminal case, and the other technology by reducing the size of the antenna head (head) There is a method of reducing the human influence on the electromagnetic waves by distance from the terminal.

However, the conventional methods for reducing the human body influence on the electromagnetic waves have a problem of lowering the efficiency of the antenna.

Meanwhile, as a service capable of multi-communication is required in one terminal, a performance of satisfying multiple bands simultaneously with a plurality of antennas and one antenna is required.

1 shows a structure of a conventional multi-band internal antenna. As shown in FIG. 1, the conventional multi-band internal antenna includes a first injection molding 1 supporting a predetermined antenna, a dual band antenna 2 formed on the first injection molding 1, and The second injection molding (3) supporting the antenna of the antenna and the single band antenna (4) formed on the second injection molding (3) are formed at different separate positions and use different separate feeds.

2 shows a return loss characteristic diagram of a conventional multi band internal antenna, and FIG. 3 shows a radiation pattern of a conventional multi band internal antenna. As shown in FIG. 2, it can be seen that resonance is formed in the USPCS band and the CDMA band by the dual band antenna 2 of FIG. 1, and resonance is formed in the GPS band by the single band antenna 4.

However, when implementing multi-band performance as in the case of the conventional multi-band internal antenna, the resonant frequency bandwidth of each band is narrowed according to the miniaturization of the terminal, and the antenna performance is easily changed in the set condition by the internal structure of the terminal. There is a problem that the antenna design is not easy. In addition, when a plurality of antennas are implemented at different positions using two or more feeds, the design of the plurality of antennas is inevitable in a limited space due to the miniaturization of the terminal, so that the effect of isolation is increased by multiple communication. There is a problem.

4 is a graph showing a change in reflection loss upon handholding of a conventional multi-band internal antenna. If the conventional multi-band internal antenna is not held by hand (that is, the conventional multi-band internal antenna is not affected by the human body), for example, the resonance level value is -17 dB in the 1.575 GHz band, but the conventional multi-band internal antenna It can be seen that the resonance level becomes -5 dB when the hand is held. Therefore, the conventional multi-band internal antenna has a problem in that performance is degraded due to human influence.

The present invention has been proposed to solve the above problems of the prior art, an object of the present invention is formed on a printed circuit board of the terminal is a first radiator which is operated in a dual band, and spaced apart from the first radiator a predetermined interval By implementing a second radiator which is pattern-printed to be fed and fed by the first radiator, it is possible to reduce manufacturing costs and reduce human influences, and does not require a separate antenna space, thereby minimizing terminal size and transmitting data. The present invention provides an adaptive multi-band internal antenna for mitigating human impact.

In order to achieve the above object, the adaptive multi-band internal antenna for reducing the influence of the human body according to the present invention includes: a first radiator formed on a printed circuit board of a terminal and operating in a dual band; And a second radiator which is pattern-printed so as to be spaced apart from the first radiator by a predetermined interval and is coupled and fed by the first radiator.

The present invention is formed on the printed circuit board of the terminal and spaced apart from the first radiator operating in the dual band at a predetermined interval, the pattern is printed on the printed circuit board to form a second radiator, which is additionally added for multi-band resonance. Since no antenna is required, a separate antenna space is not required, so the antenna can be easily miniaturized and manufacturing cost can be reduced.

The present invention is formed on a printed circuit board of the terminal and spaced apart from the first radiator operated in a dual band at a predetermined interval, the pattern is printed on the printed circuit board and fed to the coupling by the first radiator so that it is separate from the second radiator. Since there is no need to feed power, the isolation between each resonant band is improved, so that antenna design can be performed without considering separate isolation.

The present invention has a separate antenna to add a resonance band because the width of the pattern line of a part of the entire resonance length of the second radiator formed by pattern printing on the printed circuit board of the terminal is formed to form an additional resonance band. There is no need to do it.

The present invention by forming a multi-band internal antenna according to the present invention at the bottom of the printed circuit board of the terminal, the distance between the terminal and the user's hand when using the call service through the terminal is further separated to reduce the effect on the human body structure There is. Therefore, the present invention has the effect of reducing the electromagnetic wave absorbed by the human body without reducing the antenna size and has the effect of optimizing the data transmission.

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

Figure 5 shows the structure of an adaptive multi-band internal antenna for reducing the impact of the human body according to the present invention. As shown in FIG. 5, the adaptive multi-band internal antenna for reducing human influence according to the present invention includes a first radiator 10 formed on a printed circuit board 5 of a terminal and operating in a dual band, and the first antenna. The second radiator 20 is pattern-printed so as to be spaced apart from the first radiator 10 by a predetermined distance, and is coupled and fed by the first radiator 10.

The first radiator 10 is formed below the lower end of the printed circuit board 5 of the terminal, and the second radiator 20 is opposite the position of the first radiator 10 to the printed circuit board 5. And the first radiator 10 and the second radiator 20 face each other with respect to the printed circuit board 5.

In addition, the first radiator 10 may be formed above the lower end of the printed circuit board 5, and the second radiator 20 may be formed below the lower end of the printed circuit board 5.

In addition, the first radiator 10 and the second radiator 20 may be formed on the same common surface of the lower end of the printed circuit board 5 of the terminal spaced apart from each other by a predetermined interval.

The first radiator 10 is implemented in a dielectric and a pattern formed in a predetermined shape on the dielectric to operate in the CDMA band and the PCS band.

The first radiator 10 is formed of a flexible PCB having a flexibility, a pattern formed of a nickel or gold plated copper structure on the flexible PCB, and an injection molding supporting and fixing the flexible PCB.

The second radiator 20 is formed in the multiple bent pattern shape, and has a resonance length corresponding to the GPS band. In addition, the WCDMA resonance band is formed by varying the width between the pattern line and the pattern line of a portion of the entire resonance length (that is, the resonance length corresponding to the GPS band) forming the second radiator 20. The second radiator 20 is formed to a length corresponding to 0.21λ ₀ of the GPS band. The second radiator 20 operates in the GPS band according to the total length of the pattern, and operates in the WCDMA band by varying the width between the pattern line and the line. Accordingly, the entire resonance length of the second radiator 20 may be adjusted to tune to the GPS band, and the width between the line and the pattern line of a portion of the total resonance length forming the second radiator 20 may be varied. Tuning for the WCDMA band is possible. In addition, when the WCDMA band is tuned by varying the width between the line and the pattern line of the portion 21 of the total resonance lengths forming the second radiator 20, the coupling of the first radiator 10 may occur. The resonance frequency may be adjusted by affecting the USPCS band.

The second radiator 20, which is indirectly fed through electromagnetic coupling feeding, is independently tuned and impedance adjusted between resonance bands, so that frequency tuning and impedance matching are easily performed for each band. There is no need to consider the impact of isolation between each emitter.

Since the multi-band internal antenna according to the present invention is formed at the bottom of the printed circuit board of the terminal, the distance between the terminal and the user's hand can be further separated when using the call service through the terminal, thereby reducing the influence on the human body structure.

6 is a reflection loss characteristic diagram of the adaptive multi-band internal antenna for reducing the human impact according to the present invention, Figure 7 shows a radiation pattern of the adaptive multi-band internal antenna for reducing the human impact according to the present invention. 6 and 7 show the reflection loss characteristics and the radiation pattern when the terminal is not hand-held (that is, when there is no influence by the human body) when the terminal is implemented with the adaptive multi-band internal antenna for reducing the human impact according to the present invention, respectively Indicates.

As shown in the upper side of Figure 6, the reflection loss (S11) of the adaptive multi-band internal antenna for reducing the human effect according to the present invention, USPCS band (1.85GHz to 1.99 by the first radiator 10 of FIG. Good characteristics in the band including GHz) and the CDMA band (including the 824 MHz and 894 MHz bands), the GPS band by the second radiator 20 (including 1.57 GHz) and the WCDMA band (including the 2.4 GHz to 2.43 GHz band) It can be seen that this appears. In addition, as shown in the lower side of FIG. 6, it can be seen that the isolation values between each resonant band are located below -32 dB, which is smaller than the isolation values appearing on the lower side of the conventional graph shown in FIG. Therefore, since the present invention does not require a separate power supply for the second radiator, the isolation performance between the resonance bands is improved, and the antenna design can be performed without considering the isolation effect.

In addition, as shown in Figure 7, the adaptive multi-band internal antenna for reducing the human body according to the present invention, the USPCS band (band including 1.85GHz to 1.99GHz) by the first radiator 10 of Figure 5 and CDMA It can be seen that an omni-directional beam pattern is formed in the band (including the 824 MHz to 894 MHz band), the GPS band (including 1.57 GHz) by the second radiator 20 and the WCDMA band (including the 2.4 GHz to 2.43 GHz band). have.

8 is a graph showing a change in reflection loss during a hand hold of a multi-band internal antenna according to the present invention. As shown in FIG. 8, when the multiband internal antenna according to the present invention is not held by hand (that is, the multiband internal antenna according to the present invention is not affected by the human body), for example, 1.575 Although the resonance level value is -17 dB in the GHz band, it can be seen that the resonance level becomes -10 dB when the multi-band internal antenna according to the present invention is held. Therefore, the multi-band internal antenna according to the present invention is optimized for data transmission because the influence of the human body is minimized and the performance deterioration is minimized.

The multi-band internal antenna according to the present invention is a multi-minimized size for simultaneously supporting the CDMA / GPS / USPCS band as GPS service is added to the CDMA / USPCS dual band terminal technology, which is widely used in North America. It has a band characteristic.

Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. The disclosed embodiments are not intended to limit the invention but to illustrate the invention. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a view showing the structure of a conventional multi-band internal antenna.

2 is a diagram illustrating a return loss characteristic diagram of a conventional multiband internal antenna;

3 is a diagram showing a radiation pattern of a conventional multi-band internal antenna.

4 is a graph showing a change in return loss upon handholding of a conventional multiband internal antenna;

5 is a view showing the structure of an adaptive multi-band internal antenna for reducing the impact of the human body according to the present invention.

FIG. 6 is a diagram illustrating a return loss characteristic diagram of an adaptive multi-band internal antenna for reducing human influence according to the present invention; FIG.

7 is a view showing a radiation pattern of the adaptive multi-band internal antenna for reducing the impact of the human body according to the present invention.

8 is a graph showing a change in reflection loss during handholding of the adaptive multi-band internal antenna for reducing the influence of the human body according to the present invention;

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

5: printed circuit board 10: first radiator

20: second radiator 21: pattern line of variable width

Claims (6)

A first radiator formed on a printed circuit board of the terminal and operated in a dual band; And And a second radiator which is pattern-printed so as to be spaced apart from the first radiator by a predetermined distance and is coupled and fed by the first radiator. The method according to claim 1, The first radiator is formed on the lower lower portion of the printed circuit board of the terminal, the printed pattern radiator is formed on the lower upper portion of the printed circuit board opposite to the position of the dual band radiator Adaptive multiband internal antenna. The method according to claim 1, And the first radiator and the second radiator are spaced apart from each other at predetermined intervals and formed on the same common surface of the lower end of the printed circuit board of the terminal. The method according to any one of claims 1 to 3, The second radiator is formed in the shape of the multi-bent pattern, the adaptive multi-band internal antenna for reducing the impact of the human body, characterized in that to form a third resonance band by the total resonance length of the pattern. The method according to claim 4, And a fourth resonance band by varying a width between a pattern line and a line of a part of the entire resonance lengths forming the second radiator to form a fourth resonance band. The method according to any one of claims 1 to 3, The first radiator is an adaptive multi-band internal antenna for reducing the impact of human body, characterized in that formed of a flexible flexible PCB, a pattern formed on the flexible PCB, and an injection molding for supporting and fixing the flexible PCB.

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