KR100724370B1 - Planar inverted-f antenna and electronic equipment comprising it - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a planar inverted F antenna and a planar inverted F antenna, comprising: a ground plane; An antenna body; A feed line installed inclined with respect to the ground plane and electrically connecting the ground plane and the antenna body; A ground pin for grounding the antenna body to a ground plane; The present invention includes a flat type inverted antenna and a flat type inverted antenna for improving the frequency bandwidth and significantly reducing the antenna's return loss to receive clean radio waves in a wide frequency band. do.

Flat Panel Reverse F Antenna, PIFA Antenna, Inclined Feed Line, Electronic Equipment

Description

[PLANAR INVERTED-F ANTENNA AND ELECTRONIC EQUIPMENT COMPRISING IT}

1 is a perspective view showing the configuration of a planar inverted F antenna according to an embodiment of the present invention.

FIG. 2 is a side view showing the configuration of the planar inverted F antenna of FIG. 1; FIG.

3 is a perspective view illustrating a case in which the shape of the antenna body of the flat type inverted-f antenna of FIG. 1 is modified.

4 is a plan view of the antenna body of FIG.

FIG. 5 is a perspective view illustrating a case where an insulating dielectric is inserted into the flat type inverted antenna of FIG. 1. FIG.

6 is a side view of FIG. 5;

7 is a graph showing the return loss of the planar inverse F antenna according to an embodiment of the present invention.

8, 9 and 10 illustrate an electronic device having a planar inverted F antenna according to another embodiment of the present invention.

   8 is a perspective view showing the configuration of a mobile terminal;

   9 is a perspective view showing the configuration of a notebook;

   10 is a perspective view showing a configuration of an MP3 player.

FIG. 11 is an enlarged fragmentary sectional view taken along the line AA ′ of FIGS. 8, 9, and 10;

FIG. 12 is an enlarged fragmentary sectional view showing the case where the ground plane of FIG. 11 is a circuit board;

Explanation of symbols on the main parts of the drawings

100: planar inverted F antenna 110: ground plane

120: antenna body 130: feed line

140: ground pin 150: dielectric

200: mobile terminal 300: laptop

400 MP3 Player 211 Case

212: circuit board

The present disclosure relates to a flat type inverted F antenna and an electronic device having the flat inverted F antenna.

Built-in communication means such as mobile terminals such as mobile phones, PDAs, car navigation systems, portable computers such as laptops, electronic organizers, electronic dictionaries, or music players such as MP3 players, MD players, radios, audio, etc. The received electronic device performs a function of receiving and reproducing radio waves through the electronic device or transmitting information generated from the electronic device in the form of radio waves.

However, the superiority of the function of such an electronic device is of course important, and the importance of the design of the electronic device to meet the aesthetic needs of consumers is also highlighted.

In particular, the recent trend is that in order to meet the aesthetic needs of consumers who require a slim design, it is possible to reduce the size of the electronic device by embedding an antenna, which has been protruded outwardly of the electronic device, inside the electronic device. In addition, they try to beautify their external aesthetics.

In-tenna, such as the built-in antenna, is not only highly efficient to be suitable for the structure of a small electronic device, but is also a very important issue of how to reduce its size.

The rectangular planar inverted antenna (PIFA) with half the path of radiated current can be embedded inside the electronics, so it can be designed to meet the taste of consumers who want a sophisticated design. have. In addition, since the antenna is protected inside the case of the electronic device, it has the advantage of being safe from external shocks.

It is an object of the present invention to provide a planar inverted F antenna which can be miniaturized, improves bandwidth, and has a simple structure. In particular, it is an object of the present invention to provide a planar inverted F antenna which can greatly improve the bandwidth while maintaining a small characteristic by greatly improving the characteristics of a narrow band which has been pointed out as a disadvantage of the conventional inverted inverted F antenna.

In order to achieve the object as described above, the present invention comprises a ground plane having a finite plane and formed of a conductor; An antenna body for transmitting and receiving radio waves; A feed line inclined with respect to the ground plane and electrically connecting the ground plane and the conductor body; A ground pin for grounding the antenna body to a ground plane; It provides a planar inverted F antenna is configured to include.

This allows the antenna line and the ground plane to be inclined to be inclined, thereby improving the bandwidth of the planar inverted antenna and reducing the distance between the antenna body and the ground plane to maximize the miniaturization of the antenna. To make it work.

Here, the antenna body is formed in a rectangular plate shape, it is preferable that at least one or more vertices of the rectangle is trimmed (trim). This is to improve the bandwidth through trim cutting, in particular to form a circular polarization to improve the bandwidth.

In addition, it is preferable that at least one slit is formed in the antenna body, so that at least one open slit is formed by being connected to the end of the antenna body, so that the bandwidth can be widened.

In addition, it is preferable to insert an insulating dielectric between the antenna body and the ground plane, which can further reduce the distance between the antenna body and the ground plane by inserting the insulating dielectric, thereby maximizing the miniaturization of the antenna. To do this.

On the other hand, the present invention is a finite plane ground plane made of a conductor; An antenna body in parallel with the upper surface of the ground plane and having at least one slit formed therein; A feed line for electrically interconnecting the ground plane and the antenna body; A ground pin for grounding the body to a ground plane; The feed line includes a planar inverted F antenna connected to the antenna body inclined with respect to the ground plane.

This is to improve the bandwidth and to reduce the distance between the antenna body and the ground plane by installing a feed line that electrically interconnects the antenna body and the ground plane with respect to the ground plane, at least one or more in the antenna body This is to increase the bandwidth by forming an open slit.

On the other hand, the present invention is a finite plane ground plane made of a conductor; An antenna body in parallel with the upper surface of the ground plane and having at least one slit formed therein; A feed line for electrically interconnecting the ground plane and the antenna body; A ground pin for grounding the body to a ground plane; The feed line is connected to the antenna body inclined with respect to the ground plane, and provides a flat type inverted antenna in which an insulating dielectric is inserted between the ground plane and the antenna body.

This is to improve the bandwidth and to reduce the distance between the antenna body and the ground plane by installing a feed line that electrically interconnects the antenna body and the ground plane with respect to the ground plane, at least one or more in the antenna body The purpose is to reduce the distance between the antenna body and the ground plane by inserting an insulating dielectric between the antenna body and the ground plane by forming an open slit.

On the other hand, the present invention provides a flat inverted F antenna as described above; An electronic device having a flat type inverted F antenna for transmitting and receiving radio waves is provided.

The electronic device may be a portable terminal such as a mobile phone, a PDA, a car navigation system, a portable computer such as a laptop, an electronic notebook, an electronic dictionary, or a music player such as an MP3 player, an MD player, a radio, an audio, or the like. Likewise, electronic devices incorporating communication means are generically referred to.

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

However, in describing the present invention, description of already known functions or configurations will be omitted to clarify the gist of the present invention.

1 is a perspective view showing the configuration of a planar inverted F antenna according to an embodiment of the present invention, FIG. 2 is a side view showing the configuration of the planar inverted F antenna of FIG. 1, and FIG. 3 is a plan view of FIG. 4 is a perspective view illustrating a case where the shape of the antenna body of the type F antenna is modified, FIG. 4 is a plan view of the antenna body of FIG. 3, and FIG. 5 is a case where an insulating dielectric is inserted into the flat type F antenna of FIG. 1. 6 is a side view of FIG. 5, and FIG. 7 is a graph illustrating the reflection loss of the planar inverted F antenna according to the exemplary embodiment of the present invention.

1 and 2, the planar inverted F antenna 100 according to an exemplary embodiment of the present invention may include a ground plane 110, a ground plane 110, and an upper portion of the ground plane 110. An antenna body 120 installed in parallel, a ground line 110 and a power supply line 130 electrically connecting the antenna body 120, and a ground pin to ground the antenna body 120 to the ground plane 110. 140.

Here, the ground plane 110 is composed of a conductor having a finite plane. The ground plane 110 preferably has an area larger than that of the antenna body 120. The ground plane 110 may be electrically connected to a circuit board of an electronic device such as a mobile terminal. 110) It is also preferably configured to be formed integrally with the circuit board.

The antenna body 120 is installed in parallel with the ground plane 110 on the ground plane 110, and consists of a conductor to radiate or receive radio waves.

Although the antenna body 120 is illustrated in a rectangular plate shape in FIGS. 1 and 2, the shape of the antenna body 120 is not limited thereto, and the antenna body 120 may be configured of a conductor to emit or receive radio waves. However, the length L of the antenna body 120 is preferably designed in consideration of the fact that the resonance frequency of the planar inverted F antenna 100 corresponding to the quarter wavelength is generated by the length L. Do.

In addition, as shown in FIGS. 3 and 4, at least one vertex of the rectangular antenna body 120 may be trimmed by a trim 121. When the trim 121 is cut in this manner, There is an advantage that can receive circularly polarized waves of different frequency bands. In FIGS. 3 and 4, two adjacent vertices are cut through the long edge of the antenna body 120, but the trim 121 may be cut at other points as needed in the design of the antenna body 120. In addition, the number of trims 121, the cut size, etc. may be appropriately changed by those skilled in the art to which the present invention pertains.

In addition, one or more slits 122 may be formed to be connected and open up to the ends of the antenna body 120. Such slits 122 may have an advantage of extending a band width.

In this case, the presence of the slit 122 increases the length of the short-circuit transmission line formed by the feed line 130 and the ground pin 140, which will be described later, thus affecting the impedance of the antenna and the frequency band of the antenna. Crazy That is, since factors such as the number, length, and width of the slit 122 affect the impedance and the frequency band, the number, length, and width of the slit 122 according to the resistance impedance and the frequency band required at the time of antenna design. You can adjust such factors as appropriate. 3 and 4, the two slits are formed to face each other at approximately both ends of the antenna body, but as described above, they can be adjusted according to the resistance impedance and frequency band required for the antenna design. Will belong to the scope of the invention.

The presence of the feed line 130 and the ground pin 140 is one of the characteristics of the planar inverted F antenna 100, and the current supplied to the feed line 130 circulates through the antenna body 120 and the ground pin 140. By entering the ground plane 110 through), one circuit transmission line is formed. By the formation of such a circuit transmission line, it is possible to transmit and receive radio waves through the antenna body 120. In addition, impedance matching may be facilitated by appropriately adjusting the width and length of the feed line 130 and the ground pin 140.

The power supply line 130 and the ground pin 140 are connected to side ends of the antenna body 120. Such a shape serves to facilitate the formation of a circuit transmission line, but the scope of the present invention is not limited to the above shape.

The power supply line 130 electrically connects the ground plane 110 and the antenna body 120 to be inclined with respect to the ground plane 110 and the antenna body 120. As such, due to the obliquely arranged feed line 120, the frequency bandwidth of the planar inverted F antenna 100 is greatly widened, and the reflection loss at the resonant frequency is also greatly reduced. More specifically described as follows.

7 is a graph showing the return loss of the planar inverted F antenna 100 according to an embodiment of the present invention. As shown in the drawing, in the case of the conventional general planar inverted F antenna ①, the bandwidth B.W1 based on the return loss -6 dB is approximately 1.9 to 2.1 GHz, whereas the In the case of the planar inverted F antenna ② according to an embodiment, it can be seen that the bandwidth B.W2 is greatly widened to approximately 1.7 to 2.4 GHz. In addition, the return loss at the resonant frequency of 2 GHz was only -9 dB, which is significantly lowered to -27 dB in the case of the planar inverted F antenna according to the exemplary embodiment of the present invention. In other words, it is possible to transmit and receive cleaner radio waves in a wider frequency band.

In particular, the major frequency band of 3G mobile communication (3G), which has recently become a major social issue, is 1.8 GHz, and when watching satellite DMB broadcasting using a mobile terminal, the band is L-band (1 to 2 GHz). Alternatively, when considering the S-band (2 to 4 GHz), when using the flat-panel inverted antenna according to an embodiment of the present invention it is possible to transmit and receive clean radio waves in the bandwidth.

In addition, when the feed line 130 is inclined as described above, the frequency band can be further improved through appropriate coupling between the antenna body 120, the feed line 130, and the ground plane 110. There is an advantage. Therefore, the frequency band can be further improved by appropriately adjusting the inclination angle and the length of the feed line 130.

5 and 6, an insulating dielectric 150 may be inserted between the antenna body 120 and the ground plane 110. Since the antenna body 120 supplied with current from the ground plane 110 through the feed line 130 is installed in parallel with the upper surface of the ground plane 110, the ground plane 110 and the antenna body 120 are provided. A potential difference occurs between them. In this case, the distance between the antenna body 120 and the ground plane 110 is reduced by inserting a dielectric having a higher dielectric constant than the air permittivity, as compared with the case where only air exists between the antenna body 120 and the ground plane 110. There is an advantage that can be narrowed. As such, being able to narrow the distance between the antenna body 120 and the ground plane 110 serves as a great advantage in miniaturizing the size of the electronic device.

In this case, as shown in FIGS. 5 and 6, the dielectric 150 may be equal to the area of the antenna body 120 to fill the entirety between the antenna body 120 and the ground plane 110. If necessary, it may be smaller than the area of the antenna body 120 to fill only a portion between the antenna body 120 and the ground plane 110.

Meanwhile, an electronic device having a flat type inverted F antenna according to another embodiment of the present invention will be described in detail. However, in describing another embodiment of the present invention, parts and components that perform the same function will be denoted by the same reference numerals and redundant description thereof will be omitted.

8, 9 and 10 illustrate an electronic device having a flat type inverted antenna according to another embodiment of the present invention. FIG. 8 is a perspective view showing the configuration of a portable terminal, and FIG. 10 is a perspective view showing the configuration of the MP3 player, FIG. 11 is an enlarged partial cross-sectional view taken along the AA ′ cutting line of FIGS. 8, 9, and 10, and FIG. An enlarged partial sectional view showing the case where the ground plane is a circuit board.

8, 9 and 10 illustrate a mobile terminal, a notebook computer, and an MP3 player as an electronic device having a flat panel antenna, according to another embodiment of the present invention. Built-in communication means, such as portable computers such as portable terminals, laptops, electronic organizers, electronic dictionaries, or music players such as MP3 players, MD players, radios, audio, etc. All electronic devices to be used belong to the scope of the present invention.

As shown in FIGS. 8, 11, and 12, the portable terminal 200 having the flat type inverted F antenna according to another embodiment of the present invention includes a terminal main body 210 and a terminal main body 210. The slide unit 220 is slidably coupled to the front surface.

8 illustrates a slide-type portable terminal including a terminal body 210 and a slide unit 220 sliding in front of the terminal body 210, a folder-type portable terminal rotatably coupled to the terminal body and an upper end thereof, An integrated portable terminal in which a slide unit (or folder unit) is integrally formed will also be within the scope of the present invention.

Although the portable terminal 200 is illustrated as a portable telephone in FIG. 8, the portable terminal 200 may be applied mutatis mutandis to a PDA or in-vehicle navigation.

The terminal body 210 may include a case 211 forming an enclosure of the terminal body 210, and a circuit board 212 embedded in the case 211 to electrically operate and control the mobile terminal 200. And a planar inverted F antenna 100 embedded in the case 211 and electrically connected to the circuit board 212.

In this case, as shown in FIG. 11, the ground plane 110 of the planar inverted F antenna 100 may be electrically connected to the circuit board 212 by electrical connection means (for example, wire bonding). 12, the ground plane 110 may be the circuit board 212 itself. That is, the antenna body 120 is installed on the circuit board 212, and the power supply line 130 connecting the circuit board 212 and the antenna body 120 and the antenna body 120 are connected to the circuit board 212. It may also be configured as a ground pin 140 to ground. As such, when the circuit board 212 is replaced without the separate ground plane 110, there is an advantage in that the spatial utilization thereof is widened.

The slide unit 220 is provided with a display unit 221 formed on the front surface of the slide unit 220 to display information.

In the case of the portable terminal 200 having a flat type inverted F antenna according to another embodiment of the present invention, the flat type inverted F antenna 100 is configured to be embedded in the inside of the terminal body 210. The F antenna 100 may be embedded in the slide unit 220 as well as the inside of the terminal main body 210, and the built-in position is not limited as long as the F antenna 100 may be embedded in the portable terminal 200. .

Meanwhile, as illustrated in FIGS. 9, 11, and 12, the notebook 300 having the flat inverted F antenna according to another embodiment of the present invention may include a notebook body 310 and a notebook body 310. It consists of a display unit 320 is rotatably coupled to the top of.

The notebook 300 refers to a portable portable computer, and may be applied to an electronic notebook, an electronic dictionary, and the like.

The notebook body 310 may include a case 211 forming an enclosure of the notebook body 310, a circuit board 212 embedded in the case 211 to electrically operate and control the notebook 300. And a flat type inverted F antenna 100 that is embedded in the case 211 and electrically connected to the circuit board 212.

In this case, as shown in FIG. 11, the ground plane 110 of the planar inverted F antenna 100 may be electrically connected to the circuit board 212 by electrical connection means (for example, wire bonding). 12, the ground plane 110 may be the circuit board 212 itself, as described above.

The display unit 320 displays information transmitted by the circuit board 212. The circuit board 212 may be embedded in the notebook body 310, but may be embedded in the display unit 320. Of course you can.

Meanwhile, as illustrated in FIGS. 10, 11, and 12, the MP3 player 400 having the inverted F antenna according to another embodiment of the present invention includes an MP3 player body 410 and an MP3. The display unit 420 formed on the front of the three player body 410 to display information, the input unit 430 formed on one side of the MP three player body 410 to input a function, and the MP3 player body 410. Is connected to one side of the earphone is configured to listen to music through the user's ear 440.

MP3 player (MP3) 400 refers to a player capable of playing MP3 (MP3: MPEG Audio Layer-3) files, and can receive radio waves as well as receive MP3 files. Therefore, the present invention can be applied to a music player such as an MD (Mini-Disk) player having a radio wave reception function, a radio, an audio, and the like.

The MP3 player main body 400 includes a case 211 forming an enclosure, a circuit board 212 built in the case 211 to electrically operate and control the MP3 player 400, and a case ( It is composed of a planar inverted F antenna 100 embedded in the inside of the 211 and electrically connected to the circuit board 212.

In this case, as shown in FIG. 11, the ground plane 110 of the planar inverted F antenna 100 may be electrically connected to the circuit board 212 by electrical connection means (for example, wire bonding). 12, the ground plane 110 may be the circuit board 212 itself, as described above.

11 and 12, the circuit board 212 and the inside of the electronic device (200, 300, 400) having a flat type inverted F antenna according to another embodiment of the present invention configured as described above Since the planar inverted F antenna 100 is electrically connected, the radio wave may be transmitted and received through the antenna body 120 of the inverted F antenna 100.

In addition, since the inverted F antenna 100 according to the embodiment of the present invention is provided, the advantages of the inverted F antenna 100 as described above can be accommodated as it is.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited to the specific embodiments as described above, can be appropriately changed by those skilled in the art to which the present invention belongs will be.

As described above, the present invention is not only improves the frequency bandwidth, but also greatly reduce the return loss of the antenna by receiving the inclined feed line for electrically connecting the antenna body and the circuit board can receive a clean radio wave in a wide frequency band Provides a planar inverted F antenna.

In addition, the present invention provides a flat type inverted F antenna that can be miniaturized in size and can be incorporated in an electronic device.

In addition, the present invention inserts an insulating dielectric between the antenna body and the circuit board (or ground plane), whereby the distance between the antenna body and the circuit board can be further narrowed, thereby making the size smaller. Provide F antenna.

In addition, the present invention can improve the impedance and the frequency band by forming one or more slits in the antenna body, and by adjusting the number, size, width, etc. of the slit appropriately, the flat plate that can adjust the resistance impedance and frequency band as needed Provides an inverse F antenna.

In addition, the present invention provides a flat type inverted F antenna that can facilitate impedance matching by appropriately adjusting the width and length of the feed line and the ground pin.

However, the present invention is not established only when all of the above and the effects are exerted.

Claims (18)

A ground plane having a finite plane and formed of a conductor; An antenna body for transmitting and receiving radio waves; A feed line inclined with respect to the ground plane and electrically connecting the ground plane and the antenna body; A ground pin for grounding the antenna body to the ground plane; Flat inverted F antenna, characterized in that comprising a. The method of claim 1, And the antenna body has a rectangular plate shape. The method of claim 2, And said antenna body is trimmed with at least one vertex. The method of claim 3, wherein And the feed line is connected to a side end of the antenna body. The method of claim 1, And the ground plane is a printed circuit board (PCB). The method of claim 1, And the antenna body is formed with at least one slit. The method of claim 1, And an insulating dielectric is inserted between the antenna body and the ground plane. A finite plane ground plane made of a conductor; A flat antenna body installed in parallel with the upper surface of the ground plane and having at least one slit formed therein; A feed line for electrically interconnecting the ground plane and the antenna body; A ground pin for grounding the body to the ground plane; Including, And the feed line is connected to the antenna body inclined with respect to the ground plane. The method of claim 8, And the antenna body is rectangular in shape. The method of claim 9, And the antenna body has one or more edges trimmed. delete A finite plane ground plane made of a conductor; A flat antenna body installed in parallel with the upper surface of the ground plane and having at least one slit formed therein; A feed line for electrically interconnecting the ground plane and the antenna body; A ground pin for grounding the body to the ground plane; Including, The feed line is connected to the antenna body inclined with respect to the ground plane, And an insulating dielectric is inserted between the ground plane and the antenna body. The method of claim 12, And the antenna body is rectangular in shape. The method of claim 13, And the antenna body has one or more edges trimmed. A flat type inverted F antenna according to any one of claims 1 to 10 and 12 to 14; It is built in And an electric wave transmitted and received through the planar inverted F antenna. The method of claim 15, And the ground plane is electrically connected to a circuit board for electrically operating and controlling the electronic device. The method of claim 15, And the ground plane is a circuit board for electrically operating and controlling the electronic device. The method of claim 15, And the electronic device is any one of a portable terminal, a notebook computer and an MP3.

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