KR101132616B1 - Planar inverted f antenna with double coupling and wireless communication terminal having the same - Google Patents

Abstract

The present invention provides a dual resonant planar inverted-f antenna and a wireless communication terminal including the same, wherein the end of the radiator formed of the flat metal plate is adjacent to the feeder to form a coupling in an area where the end of the feeder and the radiator are adjacent to the feeder. In addition, by forming the end of the radiator formed adjacent to the feed portion in a "c" shaped pattern to implement a double resonance structure to form a coupling in the region between the "c" shaped pattern, the transmission and reception frequency in a wide band The band deviation is improved so that it can be used efficiently in the AWS band.

Description

Planar Inverted F ANTENNA WITH DOUBLE COUPLING AND WIRELESS COMMUNICATION TERMINAL HAVING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal antenna. In particular, in a planar inverted-F antenna (PIFA), a structure capable of double resonant of a pattern of a radiator of an antenna is disclosed. By forming the structure to improve the transmission and reception frequency band deviation in the wideband (wide-band) to solve the problem that the antenna efficiency is reduced when the frequency deviation occurs according to the broadband characteristics in the conventional single-band resonant structure, AWS (advanced wireless) The present invention relates to a double resonant planar anti-f antenna and a wireless communication terminal including the same.

In general, an antenna is a device that converts electrical energy into an electric wave or receives a radio wave, and is currently an antenna for a wireless communication terminal such as a mobile phone or a personal digital assistant. The antenna is largely divided into an external antenna coupled to the wireless communication terminal and formed to protrude to the outside, and an internal antenna to be formed in a case or a battery of the wireless communication terminal.

Recently, as the wireless communication terminal becomes smaller and lighter, the antenna, one of the largest parts of the wireless communication terminal, is being designed as an increasingly smaller antenna in consideration of the reception sensitivity and the harmfulness of electromagnetic waves (SAR). According to this trend, the replacement of the antenna of the wireless communication terminal from the external antenna to the internal antenna is being accelerated.

Conventional built-in antennas feed metal plates in a reverse F shape, miniaturizing by combining a space structure with minimal reactance in the feeding direction and a simple deformation structure by slit laying. The planar anti-F antenna is implemented.

In the planar anti-F antenna as described above, the beam directed toward the ground plane of the entire beam generated by the current induced in the radiator is re-organized to attenuate the beam toward the human body to improve SAR characteristics, The low profile structure can be realized by operating as a rectangular micro-strip antenna having a directionality to strengthen the beam induced by the rectangular flat radiator which is reduced in half.

Meanwhile, with the development of wireless communication services, the need for wide band services suitable for a new environment has gradually increased from a mobile operator's point of view, and as such, advanced wireless services are required to enable such broadband services. The need for an antenna that can be used efficiently in the band has also increased.

However, since the conventional planar inverse F antennas are designed as a single-band resonant structure, the antenna efficiency is increased when the deviation of the antenna performance occurs depending on the characteristics of the wide band when operating in the AWS band for the wide band service. There was a problem of deterioration.

1 illustrates a structure of a conventional planar anti-F antenna, wherein the planar anti-F antenna of the wireless communication terminal includes a ground plane 100 and a ground plane 100 of a printed circuit board (PCB) of the main body of the radio communication terminal. ) And a radiator 102, a feeding part 104 and a ground part 106.

Hereinafter, referring to FIG. 1, the ground part 106 is provided at a position corresponding to a length of about λ / 4 of a resonance frequency at one end of the radiator 102, and the power supply part 104 is in contact with the ground part 106. It is formed at a position adjacent to the branch 106. In addition, the radiator 102 is formed to extend from the feed section 104 to have a length of about λ / 4 of the resonance frequency. The conventional planar anti-F antenna as described above can improve the bandwidth by varying the path of the current by configuring the radiator 102 by a flat metal plate rather than a conductive wire.

However, the conventional planar anti-F antenna as described above has a slight improvement in bandwidth, but is mostly designed as a single band resonant structure and still has a narrow band characteristic, and antenna efficiency when frequency deviation occurs according to the wide band characteristic. There was a problem of this deterioration.

In addition, the conventional planar inverse F antenna has a problem in that it is difficult to form resonance at an adjacent frequency by using coupling because a double resonance is formed using a multiplication frequency.

Therefore, the present invention improves the antenna efficiency when a frequency deviation is generated according to the broadband characteristics in a conventional single band resonant structure by forming a radiator pattern of the antenna in a planar inverse F antenna to improve the deviation of the transmit / receive frequency band in the wideband. The present invention provides a dual resonant planar anti-F antenna and a wireless communication terminal including the same.

The present invention as described above is a dual resonant planar anti-F antenna, and includes a feeder formed on one side of the dielectric, and a radiator extending from the feeder formed on the dielectric and resonating in a predetermined frequency band, the radiator The end of the, is formed in a "c" shaped pattern, characterized in that located in the adjacent distance that the feed portion and the coupling can be induced.

In addition, the radiator forms a double resonance through the coupling induced in the region between the end of the radiator, the adjacent region of the feed portion and the pattern of the "c" shape, and is formed at the end of the radiator It characterized in that for adjusting the interval of the double resonance by adjusting the length of the "c" shaped pattern.

In addition, the radiator is formed in a shape in which a metal plate having a predetermined width on the dielectric is bent in multiple, extending from the feed portion with a length of λ / 4 of the resonant frequency, the dielectric through the LDS method Characterized in that formed on the surface.

In addition, the dielectric is formed of a non-conductive, chemically stable heavy metal complex, is located on one side of the circuit board of the main body of the wireless communication terminal for transmitting and receiving radio waves to connect the feeder and the ground plane of the circuit board. It is characterized by.

In the present invention, in the implementation of a double resonant planar inverted-f antenna, the end of the radiator formed of the flat metal plate is formed to be adjacent to the feeder to form a coupling in the region where the feeder and the end of the radiator are adjacent, and the feeder is also provided. By forming the end of the radiator formed adjacent to the "c" shaped pattern, the coupling is formed in the region between the "c" shaped pattern, so that the deviation of the transmit and receive frequency bands in the wide band is improved to be effective in the AWS band. It has the advantage of being available as.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the present invention. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

2 illustrates a structure of a Planar Inverted-F Antenna (PIFA) having a double resonant structure according to an embodiment of the present invention, wherein the planar Inverted-F antenna of the present invention includes a feeding part (feeding part) ( 200, radiator 202, dielectric material 204, and the like.

Hereinafter, the structure of the planar inverse F antenna will be described in detail with reference to FIG. 2A. First, the power feeding unit 200 is located between the circuit board (not shown) of the wireless communication terminal main body 206 and the radiator 202 to signal between the wireless communication terminal main body 206 and the radiator 202. To pass.

The radiator 202 extends from the feed part 200 and is connected to each other, and a planar metal plate having a predetermined width on the dielectric 204 is bent in multiples, and the radiator 202 is approximately equal to the resonance frequency. It is formed by? / 4 length and resonates in a predetermined frequency band.

At this time, the radiator 202 is different from the planar inverted-f antenna, which is realized by the conventional single band resonance, the radiator end 203 in the pattern formation of the radiator 202 as shown in (a) of FIG. By forming the power supply unit 200 to be adjacent to the power supply unit 200 again, coupling is induced in the region A1 adjacent to the power supply unit 200 and the radiator end 203.

In addition, by forming the radiator end 203 adjacent to the feed portion 200 in a pattern of "c" shape, the coupling is further induced in the region A2 between the patterns of the "c" shape. At this time, when the "c" shaped pattern is formed, the dual resonance interval may be easily adjusted by adjusting the pattern length of the end 203 of the radiator having the "c" shaped shape.

Accordingly, in the planar anti-F antenna, the dual resonance is possible through the double coupling between the feeder 200 and the radiator 202 as described above, thereby improving the frequency deviation generated according to the broadband characteristics, thereby improving the frequency deviation. It is possible to prevent the degradation of the antenna due to.

3 is a view showing a structure of a planar inverted antenna (PIFA) having a double resonant structure of the present invention as described above from various angles, the structure of the planar inverted F antenna through FIG. Can be. At this time, the dielectric 204 is located in one side of the circuit board of the wireless communication terminal main body 206 is implemented in the form of a rectangular parallelepiped to transmit and receive radio waves, the circuit of the power supply unit 200 and the wireless communication terminal main body 206 Connect the electronic circuit of the board.

On the other hand, in the fabrication of a planar anti-F antenna having a double resonant structure as described above uses a laser direct structuring (LDS) method for the three-dimensional configuration of the radiator 202 pattern.

The LDS process is made of a material containing a non-conductive, chemically stable heavy metal complex, forming a dielectric 204 on which the radiator 202 is to be formed, and UV (ultraviolet) to a region to form the radiator 202 on the dielectric 204. ) By exposing to a metal seed by dissolving the chemical bonds of the heavy metal complex in the region by exposing to a laser such as a laser or an excimer laser, and then exposing the metal seed. The method of forming the radiator 202 by forming a conductive structure in the corresponding region of the metallization and metallization.

Referring again to FIG. 2, in one embodiment, the dielectric rate of the dielectric 204 on which the radiator 202 is formed is set to "6", and the size of the wireless communication terminal body 206 is As shown in FIG. 2 (b), for example, when it is assumed to be formed as 46 mm (W: width) × 90 mm (L: length) × 18 mm (T: height), the planar inverse F used in the experiment The size of the antenna may be set to, for example, 5.0 mm (Wa: width) × 12.0 mm (La: length) × 3.0 mm (Ta: height).

In this case, since the AWS band is composed of a transmission frequency band (Tx) 1710 to 1755 MHz and a reception frequency band (Rx) 2110 to 2155 MHz, when the planar anti-F antenna is designed with a single resonance, the transmission / reception frequency deviation according to the broadband characteristics is different. Will occur.

Since the occurrence of the transmission and reception frequency deviation in the wide band degrades the efficiency of the planar anti-F antenna, it is necessary to increase the volume of the antenna to solve the frequency deviation caused by the wide band characteristic. In the case of increasing the size, there is a problem in miniaturization.

Accordingly, in the present invention, as shown in (a) of FIG. 2, in the structure of the planar F antenna, the radiator end 203 extending from the feed part 200 is again fed to the feed part 200. And the radiator end 203 formed adjacent to the feeder 200 and formed adjacent to the feeder 200 in a "c" shape to form an adjacent region A1 and the adjacent end of the radiator end 203 and the feeder 200. It is designed as a double resonant structure in which the coupling is induced in the region A2 between the square lines.

As a result, the double resonance structure of the planar anti-F antenna reduces the frequency deviation caused by the broadband characteristics, thereby making it possible to more efficiently receive a wideband signal in the AWS band while miniaturizing it. Becomes possible.

4 is a graph illustrating a return loss measurement result of a double resonant planar inverse F antenna according to an exemplary embodiment of the present invention.

Referring to FIG. 4, when the double resonant planar anti-F antenna of the present invention has a return loss (S ₁₁ ) of -6 dB as a reference, the transmission frequency F1 has a bandwidth of 135 MHz (7.6%). And the reception frequency F2 has a bandwidth of 105 MHz (4.9%).

 Table 1 below shows gain values of antennas measured in an electromagnetic anechoic chamber for a double resonant planar anti-F antenna having a return loss value as shown in FIG. 4.

[Table 1]

As shown in [Table 1] above, it can be seen that a deviation of about 1.5 dBi occurs in a plane anti-f antenna with a single resonance of the transmit / receive frequency band deviation in the AWS band, but the plane anti-f in the double resonance structure of the present invention. It can be seen that a deviation of about 0.8 dBi occurs in the antenna.

That is, in the planar anti-F antenna having a double resonance structure of the present invention, the deviation of the transmit / receive frequency band is measured about 0.8 dBi in the AWS band, so that the transmit / receive frequency deviation is improved by 0.7 dBi in the AWS band than in the planar anti-f antenna of the single resonance. You can see that it can be used efficiently in the AWS band.

As described above, in the dual resonant planar inverted-f antenna, the end of the radiator formed of the flat metal plate is formed to be adjacent to the feeder, so that the coupling is formed in the region where the end of the feeder and the radiator are adjacent to each other. The end of the radiator formed adjacent to the feed portion is formed in a pattern of "c" shape to form a coupling in the region between the "c" shape pattern, thereby improving the deviation of the transmit and receive frequency bands in a wide band AWS band It can also be used efficiently.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should not be limited by the described embodiments but should be defined by the appended claims.

1 is a diagram illustrating the structure of a conventional single resonant planar inverse F antenna;

2 is a diagram illustrating a structure of a double resonant planar inverse F antenna according to an exemplary embodiment of the present invention;

3 is a perspective view of a double resonant planar anti-f antenna shown in various angles according to an embodiment of the present invention;

4 is a diagram illustrating a return loss graph of a double resonant planar inverse F antenna according to an exemplary embodiment of the present invention.

<Brief description of the major symbols in the drawings>

200: feeder 202: radiator

203: emitter tip 204: dielectric

Claims (7)

A feeder formed on one side of the dielectric, A radiator extending from the feeding part and formed on the dielectric and resonating in a predetermined frequency band, The end of the radiator, It is formed in a pattern of "c" shape, it is located at an adjacent distance from which the feeding portion and the coupling can be induced, The radiator is a double resonant planar anti-F antenna that forms a double resonance through a coupling induced in the region between the end of the radiator and an adjacent region of the feed portion and a coupling induced in the region between the “c” shaped patterns. . delete The method of claim 1, The radiator, A dual resonant planar anti-F antenna for adjusting the interval of the double resonance by adjusting the length of the "c" shaped pattern formed at the end of the radiator. The method of claim 1, The radiator is, And a metal plate bent on the dielectric and extending from the feed portion with a length equal to λ / 4 of the resonance frequency. The method of claim 1, The radiator is, A double resonant planar inverse F antenna is formed on the surface of the dielectric through the LDS method. The method of claim 1, The dielectric is, A double resonant planar anti-F antenna formed from a nonconductive, chemically stable heavy metal complex. A wireless communication terminal comprising a double resonant planar inverse F antenna as claimed in claim 1 or 3 or 4 or 5 or 6.

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