KR20040000535A - Built-in gps antenna for mobile phone - Google Patents

Abstract

PURPOSE: A built-in GPS(Global Positioning System) antenna of a mobile communication terminal is provided to remove a grounding plate by using a shielding portion of a board as the grounding. CONSTITUTION: A built-in GPS antenna of a mobile communication terminal includes an antenna(400), a feeder(450), a shield portion(420), and a board(410). The antenna(400) is mounted on an outer surface of a main body of the mobile communication terminal. The feeder(450) is electrically connected to the antenna(400). The shield portion(420) is electrically connected to the antenna(400) in order to perform a grounding function. The board(410) comes in contact with the shielding portion(420). The board is electrically connected to the feeder(450). The antenna(400) is formed with a monopole antenna or an inverse F type antenna.

Description

Built-in GPS antenna of mobile communication terminal {BUILT-IN GPS ANTENNA FOR MOBILE PHONE}

The present invention relates to a built-in Global Positioning System (GPS) antenna device of a mobile communication terminal, and more particularly, to a GPS antenna device using a shield of a board as a ground plate without providing a separate ground plate.

In general, GPS is an abbreviation of the global positioning system, and is a system capable of determining a predetermined position on the earth by a plurality of satellites launched by the US Department of Defense. The GPS orbits the earth twice a day at an altitude of 20,183 km and has 18 GPS satellites on each of six orbits (reserved satellites for each orbit). And a total of 24) at equal intervals, and then receive and process a signal transmitted from a GPS satellite using a GPS receiver, thereby detecting a position where the GPS receiver exists. That is, the GPS is a device that detects its position by detecting a signal transmitted from three or more GPS satellites using a receiver consisting of a GPS antenna and a GPS receiving circuit.

Therefore, in order to use GPS, a GPS receiver must be separately provided in addition to the mobile communication terminal. That is, the GPS service can be provided only by connecting the code drawn from the GPS receiver to the terminal of the mobile communication terminal.

As described above, since the GPS receiver must be carried separately in addition to the mobile communication terminal, a mobile communication terminal in which a module having a GPS reception function is integrated has been released. The mobile communication terminal having the GPS reception function has a GPS antenna in addition to the mobile communication antenna.

1 is a perspective view of a conventional GPS antenna employed in a mobile communication terminal, and FIG. 2 is a perspective view of a mobile communication terminal having a conventional GPS antenna.

Referring to FIG. 1, the GPS antenna 7 includes a patch plate 1: a plate conductor that receives a signal transmitted from a satellite. The patch plate 1 is placed on the surface of the rectangular parallelepiped dielectric 2. A rectangular ground plate 3 is disposed along four sides of the dielectric 2. The patch plate 1 is electrically connected to the ground plate 3 via the connecting rod 4.

As shown in FIG. 2, the GPS antenna 7 having the above configuration is provided on the left side of the upper surface of the mobile communication terminal 5. The antenna 6 is disposed on the right side of the upper surface of the mobile communication terminal 5.

Such a conventional GPS antenna has a low resonance frequency of the patch plate in the dielectric, there is an advantage that can be made small at a low frequency. By the way, the conventional GPS antenna has the advantage that can be made small as described above, but has a fatal disadvantage that the radiation efficiency of the antenna is sharply reduced due to the high dielectric constant. Moreover, this also greatly reduces the overall gain of the antenna.

Figure 3a is a view showing the grounding method of the conventional monopole antenna, Figure 3b is a view showing the grounding method of the conventional inverted-f antenna.

Grounded antennas used in mobile communication terminals require a ground plane. Such a grounded antenna includes a monopole antenna, an inverted-f antenna, and the like, and a terminal using a grounded antenna has a problem of having a separate ground plate.

3A, a perspective view of a monopole antenna connected to a coaxial cable is shown.

The monopole antenna 300 is connected to the coaxial cable 310, and the inner conductor 310-1 of the coaxial cable 310 is used as a feed line of the antenna 300. The outer conductor 310-2 of the coaxial cable 310 is electrically connected to the ground plate 330.

As such, by providing a separate ground plate 310, a manufacturing and installation process of the ground plate is added in the manufacturing process, and a manufacturing cost is required according to the process.

Referring to FIG. 3B, an inverted-f type antenna 300 is connected to the coaxial cable 310, and the inner conductor 310-1 of the coaxial cable 310 is used as a feed line of the antenna 300. The outer conductor 310-2 of the coaxial cable 310 is electrically connected to the ground plate 330.

As described above, the conventional terminal has the inconvenience of having to provide the ground plate.

The present invention has been made to solve the problems of the conventional GPS antenna, to provide a grounding type GPS antenna using a shielding surface of the board as a ground plane without having a separate ground plate.

In addition, an object of the present invention is to provide an antenna bent corresponding to the curved structure of the outer surface of the mobile phone, not protruding from the outside of the mobile phone body.

Another object of the present invention is to provide a method of mounting a plurality of antennas spaced apart from each other in a mobile terminal having a plurality of antennas so as to minimize a mutual interference shape of the plurality of antennas.

Another object of the present invention is to provide a method of using a shielding surface coupled to an adjacent board among a plurality of boards as a ground plane in a mobile terminal having a plurality of boards.

In addition, an object of the present invention is to provide a built-in GPS antenna of a mobile communication terminal that can be miniaturized, but by minimizing the use of a patch type that has a disadvantage that the radiation efficiency is lowered, preventing the reduction of radiation efficiency and also miniaturization. .

1 is a perspective view showing a conventional GPS antenna.

2 is a perspective view showing a mobile communication terminal equipped with a conventional GPS antenna.

Figure 3a is a diagram showing the grounding scheme of a conventional monopole antenna.

Figure 3b is a diagram showing the grounding method of the conventional inverted-f antenna.

Figure 4a is a diagram showing the grounding method of the monopole antenna according to an embodiment of the present invention.

Figure 4b is a diagram showing the grounding method of the monopole antenna according to another embodiment of the present invention.

Figure 5a is a diagram showing the grounding method of the inverted-f antenna according to an embodiment of the present invention.

Figure 5b is a diagram showing the grounding method of the inverted-f antenna according to another embodiment of the present invention.

6 is a perspective view showing a flip type mobile communication terminal equipped with a GPS antenna according to Embodiment 1 of the present invention.

7 is a perspective view showing a folder folded in the folder-type mobile communication terminal equipped with a GPS antenna according to Embodiment 2 of the present invention.

8 is a perspective view showing a folder folded state in a folder type mobile communication terminal equipped with a GPS antenna according to Embodiment 2 of the present invention.

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

400; Monopole antenna

500: inverted f antenna

410, 40; board

50: grounding conductor

420: shielding material

450: coaxial cable

450-1: inner conductor

450-2: External conductor

In order to achieve the above object of the present invention, the built-in GPS antenna according to the present invention includes a grounded antenna mounted on a predetermined portion of the outer surface of the mobile communication terminal. The mobile communication terminal includes a GPS board or a mobile terminal board in which a circuit for processing a GPS signal is designed. The grounded antenna is electrically connected to the shielding surface of the GPS board or the mobile terminal board, so that the shielding surface of the GPS board or the mobile terminal board functions as the grounding surface of the grounding antenna.

That is, the built-in GPS antenna device of the mobile communication terminal according to the present invention is an antenna mounted on the outer surface of the main body of the mobile communication terminal, a feed line electrically connected to the antenna, a shielding surface electrically connected to the antenna and the ground function and the The board may be in contact with the shielding surface and electrically connected to the feed line.

Preferably, the antenna is one of a monopole antenna and an inverted-f antenna, and the feed line is preferably one of a coaxial cable and a microstrip.

In addition, according to another embodiment of the present invention, the outer conductor of the coaxial cable may be electrically connected to the shielding material, the shielding material may be formed with a hole corresponding to the microstrip.

On the other hand, the mounting position of the grounded antenna should be the point with the highest radiation efficiency, and the radiation efficiency is lower as the grounded antenna is closer to the PCB, so that the opposite side of the antenna is located around the speaker of the mobile terminal, which is the furthest point from the PCB. Most preferably, the mounting position of the grounded antenna.

In addition, when the mobile communication terminal is a flip type, the grounded antenna is mounted in the terminal body. In the case where the mobile communication terminal is a clamshell, the antenna is installed in the terminal body, and the grounded antenna is mounted in a folder in which a liquid crystal is mainly disposed and folded into the terminal body.

According to the above-described configuration of the present invention, since the antenna type is changed from the conventional patch type to the ground type antenna and the ground plane uses a GPS board or a mobile terminal board, the radiation efficiency of the antenna due to the high dielectric constant is drastically reduced. It can be prevented and can be implemented in a small size.

Hereinafter, a GPS antenna of a mobile communication terminal according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited or limited to the following embodiments.

4A is a diagram illustrating a grounding method of a monopole antenna according to an exemplary embodiment of the present invention.

4A to 5B, a monopole antenna and an inverted-f antenna will be described as examples of the grounded antenna. In addition, the antenna according to the present invention may have a curved structure corresponding to the outer peripheral surface of the terminal body. However, FIGS. 4A to 5B are shown as flat plates for convenience of description.

Referring to FIG. 4A, an antenna device according to the present invention includes a monopole antenna 400, a coaxial cable 450, a board 410, and a shielding material 420.

The monopole antenna 400 is electrically connected to the coaxial cable 450, and the coaxial cable 450 includes an inner conductor 450-1 and an outer conductor 450-2. That is, the coaxial cable 450 is a transmission line composed of a long cylindrical outer conductor 450-1 and one inner conductor 450-2 placed on a central axis thereof. Is concentric.

The inner conductor 450-1 operates as a feed line connecting the transceiver and the antenna, and the outer conductor 450-2 is electrically connected to the shielding material 420 to serve to ground the monopole antenna 400.

Board 410 refers to a mobile communication terminal board or a GPS board. The terminal according to the present invention is a dual terminal, and refers to a terminal used as a mobile communication terminal and a GPS terminal. In such a terminal, the board may be composed of one board or two separate boards.

The main function of the shield member 420 is to prevent harmful electromagnetic waves, but the shield member 420 according to the present invention may also perform a function of a ground plate, and is generally configured to be in contact with the board 410.

In order to block harmful electromagnetic waves (EMI), most mobile terminals are provided with a shielding material. Currently, internationally and nationally applicable standards vary slightly from country to country, but generally the standards published by the International Radio Interference Committee (CISPR) are adopted as their own standards. Therefore, most terminals are provided with shielding material for blocking electromagnetic waves.

Electro-magnetic compatibility (EMC), called electromagnetic compatibility or electromagnetic compatibility, is classified into electro-magnetic interference (EMI) and electro-magnetic susceptibility (EMS). EMI refers to electromagnetic interference, and refers to a phenomenon in which unwanted electromagnetic waves generated from various electrical and electronic equipment cause electromagnetic interference to communication or other devices. EMS stands for electromagnetic immunity and refers to the electromagnetic sensitivity of a particular device to external electromagnetic environments.

According to the present invention, by using the shielding material for blocking electromagnetic waves as a ground plate, it is possible to mount a grounded antenna without the provision of a separate ground plate.

Figure 4b is a diagram showing the grounding method of the monopole antenna according to another embodiment of the present invention.

Referring to FIG. 4B, the antenna device according to the present invention includes a monopole antenna 400, a microstrip 450, a board 410, and a shield 420.

The microstrip 450 is used as a feed line as a transmission line in which thin long flat conductors and wide conductors are fixed with a dielectric. Since it is simpler and smaller than the coaxial cable described with reference to FIG. 4A, the antenna device according to the present invention can be manufactured in a small size.

When the micro strip 450 is used as a feed line, a hole through which the micro strip line 420 passes may be formed in the shielding material 420. Hereinafter, other structures are the same as in FIG. 4A and will be omitted.

Figure 5a is a diagram showing the grounding method of the inverted-f antenna according to an embodiment of the present invention.

Referring to FIG. 5A, the antenna device according to the present invention includes an inverted-f type antenna 500, a coaxial cable 450, a board 410, and a shield 420.

The inverted-f type antenna 400 is comprised by the short circuit board 500-1 and the radiation flat plate 500-2. The shorting plate is electrically connected to the shielding material to serve to ground the inverted-fence antenna 400. The radiation flat plate 500-2 is connected to the coaxial cable 450.

Hereinafter, other structures are the same as in FIG. 4A and will be omitted.

5B is a diagram illustrating a grounding method of an inverted-f type antenna according to another exemplary embodiment of the present invention.

Referring to FIG. 5A, an antenna device according to the present invention includes an inverted-f type antenna 500, an I microstrip 470, a board 410, and a shield 420.

Hereinafter, since the other structures are the same as those of FIGS. 4B and 5A, a description thereof will be omitted, and a structure in which the above-described grounding antenna is mounted in the terminal together with the mobile communication antenna will be described.

Example 1

6 is a perspective view illustrating a ground type GPS antenna according to the present invention installed in a flip type mobile communication terminal.

As is well known, the flip type mobile communication terminal is composed of a terminal body 10 and a flip 12 covering the front lower portion of the terminal body 10. Various function keys are arranged in the front portion of the terminal body 10 covered with the flip 12. And the speaker 14 is provided in the upper part of the front surface of the terminal main body 10. FIG. The grounded antenna 20 is installed on the right side of the upper surface of the terminal body 10.

A structure in which the ground type GPS antenna according to the present invention is installed in a flip type mobile communication terminal having such a structure will be described in detail with reference to FIG. 6.

As shown in FIG. 6, the grounded GPS antenna according to the present invention has a form of a grounded antenna rather than a conventional patch type for receiving signals from satellites.

In general, a grounded antenna is one in which one of several elements of the grounded antenna is grounded. The grounded antenna 30 according to the present invention is disposed on the left side of the upper surface of the terminal body 10, which is adjacent to the speaker 14 and farthest from the grounded antenna 20. When the mobile communication terminal is a flip type, it is most preferable that the grounded antenna 30 is disposed at the above-described position, which will be described later.

In order for the grounded antenna 30 to operate, i.e., receive a signal transmitted from the satellite, the grounded antenna 30 must be grounded. To this end, in the present invention, the GPS board or the mobile terminal board 40 provided in the mobile communication terminal is used.

In order to use GPS as a mobile communication terminal, a GPS board or a mobile terminal board 40 in which a circuit for processing a signal received from a satellite is designed must be built in the terminal body 10. (40) is used for grounding.

That is, the shielding surface of the GPS board or the mobile terminal board 40 and the grounded antenna 30 are electrically connected to each other via the grounding conductor 50, so that the GPS board or The mobile terminal board 40 functions as a ground plane. Therefore, it is possible to realize miniaturization like a patch type while using a ground type antenna in the form of a grounded antenna 30.

Now, the most preferable mounting position of the grounded antenna 30 will be described in detail. As described above, the grounded antenna 30 is most preferably mounted at a point farthest from the grounded antenna 20 while adjacent to the speaker 14.

The reason is that the radiation efficiency is drastically lowered as the grounded antenna 30 is adjacent to the GPS board or the mobile terminal board 40, and more radio wave interference occurs as the grounded antenna 30 is adjacent to the grounded antenna 20. .

Therefore, since the speaker 14, in which the user's ear of the mobile communication terminal is located, is farthest from the GPS board or the mobile terminal board 40, the grounded antenna 30 is adjacent to the speaker 14 and the grounded antenna ( 20) on the opposite side. In particular, the grounded antenna 30 is preferably disposed in the rear direction rather than the front of the terminal body 10.

When the mounting position of the grounded antenna 30 is described with reference to the terminal body 10, the grounded antenna 30 is mounted on the upper left and left sides of the upper surface of the terminal body 10. Since the grounded antenna 30 may be in the form of a wire or a PCB in its own characteristics, any form may be employed.

In addition, as described above, the grounded antenna 30 is bent at an approximately 90 ° angle along the upper left and left sides of the upper surface of the terminal body 10, because the grounded type to ensure an appropriate reception efficiency This is because the minimum length of the antenna 30 is limited.

As a result, if the proper reception efficiency is ensured, the grounded antenna 30 may be a short straight line disposed only on the upper left side or the upper left side of the terminal body 10 without having to be bent as in the first embodiment.

Example 2

7 and 8 illustrate a state in which a grounding type GPS antenna according to the present invention is installed in a foldable mobile communication terminal. FIG. 7 is a perspective view illustrating a folded state of a folder, and FIG. 8 is a perspective view illustrating an open state of a folder. to be.

As shown in FIG. 7 and FIG. 8, the clamshell mobile communication terminal is rotatably connected to the upper end of the terminal body 60 having various keys disposed thereon and the terminal body 60 to cover the front surface of the terminal body 60. It consists of a folder 62.

The difference between the flip type and the flip type is that the liquid crystal display panel is first arranged in the folder 62 and the speaker 64 is also arranged in the folder 62. In addition, the GPS board or the mobile terminal board 40 is also built in the folder 62.

Accordingly, the position of the grounded antenna 30 is different from the flip type. That is, the principle in which the mounting position of the grounded antenna 30 is selected is the same as that mentioned in Embodiment 1, so that the grounded antenna 30 is based on the folder 62 adjacent to the speaker 64 based on FIG. It is mounted on the lower left side and lower left side.

That is, since the speaker 64 is disposed below the inner surface of the folder 62, the speaker 64 is located at the upper side when the folder 62 is opened as shown in FIG. 8, so that the grounded antenna 30 is the grounded antenna 20. It is mounted on the lower left side and the lower left side of the folder 62 which is the furthest from and closest to the speaker 64. Therefore, the grounded antenna 30 is diagonal with the grounded antenna 20.

The grounding antenna 30 mounted at such a position is connected to the shielding surface of the GPS board or the mobile terminal board 40 embedded in the folder 62 by a grounding conductor 50.

In addition, as mentioned in Embodiment 1, the grounded antenna 30 may be a straight line disposed only on the lower left side or the lower left side of the folder 62 without needing to be bent, if proper efficiency is ensured.

On the other hand, in Embodiments 1 and 2, if the grounded antenna 30 protrudes from the terminal, the appearance is not good, so a groove having a shallow depth is formed in the terminal, and the grounded antenna 30 is not protruded in the groove. It is desirable to accommodate the water.

As described above, according to the present invention, it is possible to provide a grounding type GPS antenna using a shielding surface of the board as a grounding surface without providing a separate grounding plate.

In addition, the present invention has the effect that it is possible to provide a bent antenna corresponding to the curved structure of the outer surface of the mobile phone, not the protruding antenna.

In addition, the present invention also has the effect of minimizing the shape of the mutual interference of the antenna by mounting a plurality of antennas spaced apart.

In addition, the present invention has the effect of providing a built-in GPS antenna of the mobile communication terminal that can be implemented in miniaturization while preventing the degradation of the radiation efficiency.

In addition, the present invention has the effect that the GPS antenna can be miniaturized by using the shielding surface of the GPS board or the mobile terminal board as a ground plane of the antenna.

In the above, the GPS antenna according to a preferred embodiment of the present invention has been described and illustrated, but the present invention is not limited to the above-described embodiment, but the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in the field can understand that various changes can be made.

Claims (13)

In the built-in GPS antenna device of a mobile communication terminal having a mobile communication antenna, An antenna mounted on an outer surface of the main body of the mobile communication terminal; And A feed line electrically connected to the antenna; A shielding surface electrically connected to the antenna and serving as a grounding function; And A board in contact with the shielding surface and electrically connected to the feed line Built-in GPS antenna of the mobile communication terminal comprising a. The method of claim 1, The antenna is Built-in GPS antenna of the mobile communication terminal, characterized in that one of the monopole antenna and the inverted-f antenna. The method of claim 1, The feeder is Built-in GPS antenna of the mobile communication terminal, characterized in that one of the coaxial cable and the microstrip. The method of claim 3, wherein The outer conductor of the coaxial cable is a long GPS antenna of the mobile communication terminal, characterized in that electrically connected with the shield. The method of claim 3, wherein The shield member has a long GPS antenna of the mobile communication terminal, characterized in that the hole corresponding to the microstrip is formed. The method of claim 1, The antenna, Built-in GPS antenna of the mobile communication terminal, characterized in that disposed adjacent to the speaker of the terminal body. The method of claim 6, The antenna, Built-in GPS antenna of the mobile communication terminal, characterized in that located on the opposite side of the mobile communication antenna while being arranged together on one side of the terminal main body in which the mobile communication antenna is arranged. The method of claim 6, The antenna is Built-in GPS antenna of the mobile communication terminal, characterized in that the curved shape disposed along two adjacent surfaces of the terminal body. In the built-in GPS antenna of the flip-type mobile communication terminal comprising a terminal body provided with a speaker and an antenna, and a flip rotatably connected to the lower front of the terminal body, An antenna mounted adjacent to the speaker and mounted on an outer surface portion of the terminal body opposite to the antenna; A feed line electrically connected to the antenna; A shielding surface electrically connected to the antenna and serving as a grounding function; And A board in contact with the shielding surface and electrically connected to the feed line Built-in GPS antenna of the flip-type mobile communication terminal comprising a. The method of claim 9, The speaker is disposed above the front of the terminal body, The antenna is disposed on the right side of the upper surface of the terminal body, The antenna is a built-in GPS antenna of the flip-type mobile communication terminal, characterized in that mounted on the upper left and / or the upper left side of the terminal body. A built-in GPS antenna of a folding mobile communication terminal including a terminal body having an antenna and a folder rotatably connected to a front upper end of the terminal body and provided with a speaker. An antenna mounted on an outer surface portion of the folder adjacent to the speaker; A feed line electrically connected to the antenna; A shielding surface electrically connected to the antenna and serving as a grounding function; And And a board in contact with the shielding surface, the board being electrically connected to the feed line. The method of claim 11, The antenna is a built-in GPS antenna of the clamshell mobile communication terminal, characterized in that disposed in a folder portion diagonally to the antenna. The method of claim 11, The speaker is disposed below the inner surface of the folder, The antenna is disposed on the right side of the upper surface of the terminal body, The antenna is a built-in GPS antenna of the clamshell mobile communication terminal, characterized in that mounted on the lower left side and / or lower left side of the folder.