KR100450969B1 - Dual antenna antenna for radiation control in a mobile communication system - Google Patents

Abstract

The present invention relates to an antenna of a mobile communication terminal, which uses two directional antennas, and is mounted on a folder (or dual folder) portion and a main body portion of a clamshell mobile communication terminal, respectively, when the folder is closed in the main body (standby state). ) Allows the two directional antennas to be oriented in opposite directions, resulting in overall omnidirectional characteristics while avoiding performance degradation due to the use of directional antennas.

When the folder is opened in the main body (calling state), the folder and the main body have a constant angle to each other, and the two directional antennas installed in the folder and the main body have directivity characteristics in the same direction, respectively, to reduce electromagnetic waves directed toward the head.

Description

DUAL ANTENNA FOR RADIATION CONTROL IN A MOBILE COMMUNICATION SYSTEM}

The present invention relates to an antenna of a mobile communication terminal, and in particular, when two directional antennas are mounted on a folder part and a main body part of a folder (or dual folder) type mobile communication terminal, respectively, the folder is closed in the main body (standby state) and the The present invention relates to a dual antenna that adjusts the radiation characteristics of a mobile communication terminal that can improve the performance and reduce electromagnetic waves directed to the head by adjusting the radiation characteristics when the folder is opened in the main body (call state).

In general, an antenna for a mobile communication terminal mainly uses an antenna capable of omnidirectional storage for the purpose of bidirectional communication and easy portability.

Antennas, such as conventionally available mobile communication terminals, are combined in two forms, respectively, depending on the call waiting state and the call state, and are capable of easily transmitting and receiving linear polarized signals. The portion protruding from the upper end of the mobile communication terminal is usually a helical antenna having a spring shape, and has an advantage that a call can be made regardless of the position of the mobile communication terminal. In addition, the monopole whip antenna performs better than the helical antenna when it is perpendicular to the earth's surface, and it is impossible to receive a signal when it is horizontal. . The most widely adopted Heryx and whip coupled antennas in the world are the same as those shown in FIGS. 1 and 2 and are disclosed in Korean Patent Publication No. 2001-0044820 published on June 5, 2001. Details thereof are also described in detail here, and thus, further descriptions thereof will be omitted. As shown in FIGS. 1 and 2, these antennas are mounted with an isotropic antenna composed of a herlix and a whip protruding from the upper right or left side of the mobile communication terminal as in the example of FIG. Figures 4a, 4b is an isotropic antenna equivalent circuit composed of the Herlix and the whip protruding on the right or left upper side as in the example of Figure 3 of the clamshell mobile communication terminal, where the antenna is an isotropic antenna As in the example of 411 of 4a and 4b, the terminal 412 has an omni-directional radiation characteristic, so that radio waves are generated to the human head during a call, and thus radiation cannot be avoided. In case of having the advantage that the characteristics are good when not close to the head, but when the head is close to the increase in the amount of electromagnetic waves absorbed by the human body performance is reduced, the SAR is a standard of the effect on the human body by the electromagnetic wave problem There is. As a result, some of the world's leading cell phone and antenna manufacturers are spending enormous costs and manpower to develop new concepts for antennas that do not radiate into the human head. As a solution, the front part of the mobile phone that is in close contact with the human head in the state of using the mobile phone is proposed to have a small amount of outgoing radio waves and to radiate most of the radio to the rear part. Specific examples thereof include a patch antenna or a PFIA antenna mounted on the top of a mobile phone rear part. The patch antenna, PFIA antenna, etc. are shown in the patent 2001-0000456 published on January 5, 2001, the Republic of Korea Patent Publication. And if the directional characteristics of the front of the mobile phone, that is, the electromagnetic wave does not go out toward the human body Therefore, it is possible to obtain effects such as improved call performance and SAR reduction when the human body is in close proximity. However, if you are not close to the head, the performance of the mobile phone is reduced because it does not receive the radio waves from a certain direction.

Accordingly, an object of the present invention is to install the two directional antennas in the folder and the main body of the foldable mobile communication terminal in order to take advantage of the non-directional characteristics and directional characteristics, the two directional antennas in the same direction when the folder is open call It is to provide a dual antenna to reduce the electromagnetic wave directed to the head direction by the directional characteristic of the, and to improve the performance by the direction of the two directions are opposite to each other in the call waiting state, the folder is closed.

It is still another object of the present invention to install a patch on antenna (POD) directional antenna at the bottom of the main body and the outer window of the dual folder in the dual folder type mobile communication terminal to implement the same purpose and the upper part of the folder. It is to provide an antenna that can solve the space limitation.

In order to accomplish the above object, the present invention provides a directional antenna separately installed in each of a folder and a main body of a folder (or dual folder) mobile communication terminal so that the two directional antennas have a non-directional characteristic when the folder is opened from the main body. The two directional antennas are configured to have directivity in the same direction as the opening angle of the folder so that when the folder is opened from the main body, electromagnetic waves are radiated in the opposite direction to the head direction. do.

The present invention prevents the performance deterioration caused by the use of the directional antenna due to the overall omnidirectional use by the directional characteristics radiated in opposite directions of the dual directional antennas during call waiting, and maintains a constant between the folder and the main body during the call state. Characterized in that it is configured to reduce the electromagnetic waves directed to the head by the directional characteristics radiated in the same direction of the dual directional antenna forming an angle of.

The present invention installs the POD (Printed On Display) patch antenna on the LCD window of the dual folder having a window for recognizing the operation state from the outside in the closed state of the folder, by installing a micro patch antenna on the main body of the two POD The same function is implemented between the patch antenna and the micro patch antenna.

1 and 2 are views showing a shape in which a helical antenna is coupled to an end of a whip antenna as a general helical and whip antenna;

3 is a view illustrating a general helical and whip antenna in which a helical antenna is coupled to a body of a flip type mobile communication terminal.

FIG. 4 is a diagram illustrating an antenna equivalent to an antenna of a conventional foldable mobile communication terminal main body of a helical and whip antenna, and an emission pattern according to an opening and closing of a folder according to an azimuth pattern.

5 is an exemplary view of a directional antenna using a micro patch according to an embodiment of the present invention

6 is an exemplary diagram in which a directional antenna using FIG. 5 is installed in each of a folder and a main body of a clamshell mobile communication terminal.

7 illustrates an equivalent antenna of a directional antenna of a folder and a main body in a main body of a clamshell mobile communication terminal according to an embodiment of the present invention;

8 is a view showing a radiation pattern as an azimuth pattern according to opening and closing of a folder according to the present invention of FIG.

9 is a diagram illustrating an embodiment of a dual-fold mobile communication terminal according to another embodiment of the present invention.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described 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 to refer to the same components even though they are shown in different drawings.

5 is an exemplary configuration diagram of first and second directional antennas using a microstrip patch according to the present invention.

5A is a front view of the microstrip patch antenna provided on the upper surface of the folder 400 and the lower surface of the main body 401 as in the examples of FIGS. 4A and 4B.

FIG. 5B is a plan view of the microstrip patch antenna provided on the upper surface of the folder 400 and the lower surface of the main body 401 as in the examples of FIGS. 4A and 4B.

In (5a, 5b), 502 is a substrate having a predetermined dielectric constant, and 501 is a microstrip line of a highly conductive material. The microstrip patch antenna has an advantage of excellent design freedom. As the substrate 502, ferrites, air or composite materials may be used as other dielectrics, and a multi-layered substrate may also be used.

FIG. 6 is an exemplary diagram in which the microstrip patch antenna of FIG. 5 is installed in upper and lower portions of the folder 400 and the main body 401 of the mobile communication terminal.

(6a) shows a state in which the call waiting folder 400 is closed by the main body 401,

Reference numeral 6b denotes a state in which a folder 400 in a call state is opened in the main body 401. Here, 501a and 501b are microstrip lines of a microstrip patch antenna, 502a and 501b are dielectric substrates, and 601 is The PCB which mounts the circuit of each part of the folder 400 and the mobile communication terminal of the main body 401 is shown. The microstrip lines of the microstrip patch antennas 501a and 501b are connected by 708 so that the two directional antennas 501a when the folder 400 is opened from the main body 401 rather than each of the antennas separately operating. , 501b is operated so as to have a different direction of the opposite direction, on the other hand, when the folder 400 is opened from the main body 401, two directional antennas (501a, 501b) are electromagnetic waves in the direction opposite to the head direction While radiating, the folder 400 operates to have directivity in the same direction as the opening angle degree from the main body 401. As a result, the microstrip patch antennas 501a and 501b installed in the folder 400 and the main body 401 are connected through the line 708 of the circuit on the PCB, and 706 is between the microstrip patch antennas 501a and 501b. The above characteristics are exhibited based on the feed point of.

7 is a diagram illustrating the characteristics and equivalent antennas of the folder 400 and the first and second directional antennas of the main body in the clamshell mobile communication terminal main body 401 according to the present invention.

(7a) is a diagram showing the omnidirectional radiation characteristics 701 as a whole by having the two directional antennas in the opposite direction to each other in the call waiting state of the folder 400 of the mobile communication terminal closed,

7b is an electromagnetic wave when two first and second directional antennas face each other in the same direction with each other in the structure of the folder 400 in a call state with the folder 400 of the mobile communication terminal open. Is a diagram showing the directional radiation characteristic 702 in the opposite head direction while decreasing.

That is, in the present invention as in the example of (7a), in the present invention as in the example of (4a) of FIG. 4, while maintaining the omni-directonal radiation characteristic in the call standby state as in the prior art, the folder 400 is opened as in (7b). It can be seen that in the opposite direction of the head, it can have a directional radiation characteristic such as 702 in the opposite direction to reduce the electromagnetic waves that can be absorbed by the human body.

Therefore, in the present invention, unlike the example of FIG. 4, the two first and second directional microstrip patch antennas 501a and 501b attached to the folder 400 and the main body 401 are the folder 400 and the main body 401. According to the operation, that is, the directional characteristics of the two antennas according to the call state or the standby state has the radiation characteristics in the opposite or the same direction, as shown in 701 or 702 of Figs. 7A and 7B. 8 is an exemplary view comparing radiation radiation characteristics when opening or closing between the folder 400 and the main body 401. That is, 801 is a radiation pattern when the folder 400 is opened, and 802 is a radiation pattern when the folder 400 is closed. As the difference between 801 and 802, when the folder 400 is closed, the radiation pattern is almost non-directional, so there is no problem in performance compared to the conventional antenna, and when the folder 400 is opened, the electromagnetic wave radiated toward the head In short, from the antenna's point of view, the value of SAR absorbed by the head is also reduced.

When the folder 400 is closed and the call waiting state is as shown in (7a), the antennas 700 and 707 of the equivalent circuit eventually become directional, but each of the two micropatch antennas 501a and 501b is directional but is opposite to each other. Since it has a directivity of, it has an omnidirectional characteristic. Therefore, it is possible to prevent the performance degradation that can occur in the conventional directional antenna. In the open state of the folder 400, the antennas 700 and 707 of the equivalent circuit maintain a constant angle between the folder 400 and the main body 401 as shown in (7b). Since each of the antennas 501a and 501b has directivity in the same direction, and thus has directional radiation characteristics, radiation in the opposite direction of the head is further improved as in the example of 702 of FIG. 7B while reducing electromagnetic waves directed to the head direction.

9 and 10 are examples of an antenna of a dual clamshell mobile communication terminal according to another embodiment of the present invention. The dual folder 402 refers to a configuration in which display windows are installed on both upper and lower surfaces of a folder. Referring to FIG. 9, the directional antennas are installed in the main body 401 and the dual folder 402 of the dual folder type mobile communication terminal. In the call waiting state of the dual folder type mobile communication terminal, the directional antenna 707 of the main body 401 is used. And the directional antenna 612 of the dual folder 402 in the opposite direction, and the directional antenna 707 and the dual folder 402 of the main body 401 in a call state of the dual foldable mobile communication terminal. It is configured to have the directivity in the same direction with the directivity antenna 612 of. The directional antenna 612 installed in the dual folder 402 is composed of a print on display (POD), and the print on display (POD) type directional antenna 612 is installed on the upper portion of the LCD window 611. That is, the example of FIG. 9 is to make a separate window 611 in the state in which the dual folder 402 is closed without opening the dual folder 402 of the folder type wireless terminal, and to know the operating state of the wireless terminal. In this regard, the main body 401 uses a microstrip patch antenna 501b as a planar built-in antenna as in the example of FIG. 5, but can be mounted on the LCD of the window 611 of the dual folder 402 (POD) type. An antenna using the directional antenna 612 is installed. The printed on display (POD) type directional antenna 612 is made of an indium oxide doped with tin oxide (ITO) material that is electrically conductive but optically transparent. Regarding the print on display (POD) type directional antenna 612, it is known that it is known at the "International Scientific Conference of ROC in August 2001" under the heading "implementing a POD antenna of a mobile terminal". However, the antenna implementation here is intended to replace traditional helical or monopole antennas, to perform both display and antenna functions simultaneously, and to eliminate drawbacks that can be easily generated mechanically. However, the present invention also applies to the dual folder 402 in the embodiment between the microstrip patch antenna 501b installed in the main body 401 and the antenna of the print on display (POD) type directional antenna 612 as described above. ) Has a non-directional characteristic when opened from the main body 401 so that the two directional antennas have different directions of opposite directions, and thus become omnidirectional, and the two directional antennas have the dual folder 402 as the main body. When opened from 401, the electromagnetic wave is directed in the same direction as the opening angle of the dual folder 402 so that the electromagnetic wave is radiated in the opposite direction to the head direction. As such, when the POD type patch antenna 612 is installed on the LCD window of the dual folder 402, since the ITO is electrically conductive and optically transparent, the space limitation of the upper part of the folder due to miniaturization can be solved.

As described above, in the present invention, when a folder or a dual folder is opened and closed from two antennas, the antenna may have a completely different copy pattern. In the case of an open call, the direction of the head is reduced by directivity in the same direction. In the call waiting state, the two directions are opposite to each other, that is, the performance is improved by the overall omnidirectional characteristic. In addition, the present invention provides the advantages of the same function as above by installing a POD (Printed On Display) type patch antenna on the LCD window of the dual folder having a window that can recognize the operating state from the outside while the folder is closed. There is an advantage that enough space can be provided at the top of the folder.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

Claims (13)

delete delete delete In the antenna of the clamshell mobile communication terminal, The first directional antenna 700 is installed in the folder 400 of the mobile communication terminal, the second directional antenna 707 is installed in the main body 401 of the mobile communication terminal, and the first and second directional antennas ( The first and second antennas 700 and 707 may have directivity in the opposite directions between the first and second directional antennas 700 and 707 in a call waiting state based on the quick contact point 706. 700) and a dual antenna for adjusting the radiation characteristics of the mobile communication terminal, characterized in that configured to have the directivity of the second direction antenna (707) in the same direction. The method of claim 4, wherein The first directional antenna 700 is a dual antenna for adjusting the radiation characteristics of the mobile communication terminal, characterized in that installed in the lower portion of the main body 401 of the mobile communication terminal. The method of claim 4, wherein The second directional antenna 707 is a dual antenna for adjusting the radiation characteristics of the mobile communication terminal, characterized in that installed on top of the folder 400 of the mobile communication terminal. The method of claim 4, wherein Dual antennas for adjusting the radiation characteristics of the mobile communication terminal, characterized in that the first and second directional antenna (700,707) is composed of microstrip patches (501a, 501b). The method of claim 4, wherein Mobile communication, characterized in that the first or second directional antenna (700,707) is formed of a substrate (501a, 501b) having a predetermined dielectric constant between the conductive microstrip patches (501a, 501b) and the micro flat plate (601) Dual antenna to adjust the radiation characteristics of the terminal. The method of claim 8, Substrates (501a, 501b) is a dual antenna for adjusting the radiation characteristics of the mobile communication terminal, characterized in that consisting of ferrite or air or a composite. The method of claim 8, Dual antenna for controlling the radiation characteristics of the mobile communication terminal, characterized in that the substrate (501a, 501b) is composed of a multi-layer. In the antenna of the dual clamshell mobile communication terminal, The directional antenna is installed in each of the main body 401 and the dual folder 402 of the dual foldable mobile communication terminal, and in the call waiting state of the dual foldable mobile communication terminal, the directional antenna 707 of the main body 401 The directivity of the dual folder 402 with the directional antenna 612 of the print on display, It is configured to have the same direction of directivity between the directional antenna 707 of the main body 401 and the print on display type directional antenna 612 of the dual folder 402 in the call state of the dual-fold mobile communication terminal. Dual antenna for adjusting the radiation characteristics of the mobile communication terminal. delete The method of claim 11, Printed On Display (POD) type directional antenna 612 is a dual antenna for adjusting the radiation characteristics of the mobile communication terminal, characterized in that the installation is configured on top of the LCD window 611 of the dual folder (402).