KR20100098197A - Dielectric resonator antenna - Google Patents

Abstract

PURPOSE: A dielectric resonator antenna is provided to implement two or more resonant frequencies by including a dielectric resonating unit. CONSTITUTION: A dielectric resonator antenna comprises a ground plate(200), a radiator(202), a dielectric resonating unit(208), a ground pin(206) and a power feeding pin(204). The radiator is arranged in parallel with the ground plate. The dielectric resonating unit is arranged between the ground plate and the radiator. The ground pin is combined between the ground plate and the radiator. The feeding pin supplies power to the radiator. A loop current is formed by the ground plate, the ground pin, the radiator, and the feeding line. The dielectric resonating unit is excited by the loop current and implements a specific resonant frequency.

Description

Dielectric Resonator Antenna {DIELECTRIC RESONATOR ANTENNA}

FIELD OF THE INVENTION The present invention relates to dielectric resonator antennas and, more particularly, to dielectric resonator antennas, in particular planar inverted-f antennas, comprising dielectric resonators that are excited by loop current to implement a particular resonance frequency.

An antenna for a mobile communication terminal is a device for receiving an internal RF signal or outputting an internal RF signal to the outside during mobile communication, which is an essential component of the mobile communication terminal.

Recently, according to the trend of miniaturization of the mobile communication terminal, technology development for an internal antenna rather than an external antenna has been actively performed. In particular, since the mobile communication terminal tends to implement various functions such as Wibro, DMB, etc. in addition to voice calls, bandwidths satisfying the functions must be implemented while satisfying the compactness.

Therefore, recently, many antennas capable of realizing multi-bands have been developed, and a planar inverted F antenna (PIFA) as shown in FIG. 1 below is generally used for a mobile communication terminal. have.

1 is a perspective view showing a general flat type inverted F antenna.

Referring to FIG. 1, the planar inverted F antenna includes a ground plate 100, a radiator 102, a feed pin 104, and a ground pin 106.

The radiator 102 realizes a specific resonance frequency when a predetermined power is supplied through the feed pin 104. However, since the planar inverse F antenna implements only one resonant frequency, a technique of embodying a pattern of the radiator 102 in a meander shape or forming a slit in the radiator 102 may be used to implement multiple bands. Were proposed.

However, although these techniques can implement multiple bands, it has been difficult to independently tune parameter values that complicate the structure of the antenna and determine characteristics such as resonance frequency, bandwidth, gain, and the like.

It is an object of the present invention to provide a dielectric resonator antenna, in particular a planar inverted F antenna, having an uncomplicated structure and capable of implementing multiband and wideband.

In order to achieve the above object, the dielectric resonator antenna according to an embodiment of the present invention is a ground plate; A radiator arranged spaced apart from the ground plate; A dielectric resonator disposed between the ground plate and the radiator and formed of a predetermined dielectric; A ground pin coupled between the ground plate and the radiator; And a feed pin feeding power to the radiator. Here, the dielectric resonator is excited by a loop current formed by the ground plate, the ground pin, the radiator, and the feed line to implement a specific resonance frequency.

Dielectric resonator antenna according to another embodiment of the present invention is a ground plate; A radiator arranged spaced apart from the ground plate; And a dielectric resonator disposed between the ground plate and the radiator and configured of a predetermined dielectric. Here, the dielectric resonator is excited by a magnetic current source to implement a specific resonance frequency.

Since the dielectric resonator antenna, in particular the planar inverted F antenna, according to the present invention includes a dielectric resonator which is excited by a loop current formed upon feeding the radiator to implement a specific resonance frequency, the antenna is capable of implementing two or more resonance frequencies. That is, multiband and wideband can be implemented. In particular, since the dielectric resonator is positioned between the ground plate and the radiator to implement the resonant frequency, the structure of the antenna may be simple.

In addition, since various resonant frequencies may be realized by varying the size and dielectric constant of the dielectric resonator, it is relatively easy to tune parameter values that determine characteristics such as resonant frequency, bandwidth, and gain.

In addition, since the dielectric resonator increases the electrical length of the radiator positioned above the dielectric resonator, the radiator may have a smaller size than the general antenna even if the dielectric resonant frequency is the same as that of the general antenna. That is, the size of the radiator may be reduced.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to a particular embodiment, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but other components may be present in the middle. It should be understood. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

2 is a circuit diagram illustrating a dielectric resonator antenna according to an embodiment of the present invention.

The dielectric resonator antenna of the present embodiment has a simple structure and implements a multiband and a wideband antenna, for example, a planar inverted-F antenna (PIFA) used in a mobile communication terminal. However, the antenna is not limited to the planar inverted F antenna, but for convenience of description, the antenna is assumed to be a planar inverted F antenna.

Referring to FIG. 2A, the dielectric resonator antenna of the present embodiment includes a ground plate 200, a radiator 202, a feed pin 204, a ground pin 206, and a dielectric resonator 208.

The ground plate 200 is formed by plating a metal material (conductor material) on a substrate, and is electrically connected to a ground (not shown) in, for example, a mobile communication terminal. Here, the substrate may be made of a dielectric material, and a PCB, a FR4 substrate, or the like may be used.

According to an embodiment of the present invention, the portion 212 of the ground plate 200 may be free of a metallic material as shown in FIG. 2A. That is, the ground plate 200 may be formed of a portion 210 in which the metal material exists and a portion 212 in which the metal material does not exist.

The radiator 202 is arranged to be spaced apart from the ground plate 200 by a predetermined distance, preferably arranged in parallel with the ground plate 200, made of a metal material. When the predetermined power is supplied through the feed pin 204, the radiator 202 generates a predetermined radiation pattern and outputs an RF signal to the outside or receives an external RF signal.

The power supply pin 204 is a passage through which power is supplied. For example, the power supply pin 204 is connected to a 50Ω power supply line (not shown) to provide electric power input through the power supply line to the radiator 202. That is, the feed pin 204 is a feed passage to the radiator 202.

The ground pin 206 is coupled between the ground plate 200 and the radiator 202 to electrically connect the radiator 202 to the ground plate 200. In particular, the ground pin 206 is electrically connected to a portion 210 of the ground plate 200 where a metal material exists, as shown in FIG. 2A. As a result, when power is supplied to the radiator 202, one loop passes through the ground plate 200, the feed pin 204, the radiator 202, and the ground pin 206, as shown in FIG. A loop current 220 is formed. In this case, the magnetic field 222 is induced by the loop current 220.

The dielectric resonator 208 is made of a dielectric material, preferably, a dielectric having a high relative dielectric constant, and may be positioned between the radiator 202 and the portion 212 of the ground plate 200 where no metallic material exists. Here, the dielectric resonator 208 may directly contact the radiator 202 or may be spaced apart by a predetermined distance.

The dielectric resonator 208 is formed by the loop current 220 formed through the ground plate 200, the feed pin 204, the radiator 202, and the ground pin 206, as shown in FIG. 2B. Here it is. In detail, the magnetic field 222 is generated by the loop current 220, and this magnetic field 222 acts as a current source to excite the dielectric resonator 208. That is, the dielectric resonator 208 is powered by the magnetic current source 222. In this case, a displacement current having a predetermined magnitude flows through the dielectric resonator 208, and a specific resonance frequency is realized by the displacement current. According to one embodiment of the invention, while the radiator 202 implements a resonant frequency of a relatively low frequency band, such as the Wibro band, the dielectric resonator 208 is a resonance of a relatively high frequency band, such as a WLAN band, etc. Frequency can be implemented.

When the dielectric resonator 208 resonates, the radiator 202 functions as ground, so an image theory may be applied in which an image exists in the opposite direction of the radiator 202. As a result, the dielectric resonator 208 may implement a WLAN (5.725 GHz to 5.850 GHz) band with a small size of 11 mm × 9 mm × 4 mm and a dielectric constant of 32 as described below. However, since the image theory is a well known theory, a detailed description thereof will be omitted.

According to one embodiment of the present invention, the dielectric resonator 208 is located at the lower end of the radiator 202, and is located on the ground plate 200 as shown in Figure 2 (A) of the ground plate 200 It may be arranged spaced apart from the boundary line, the feed pin 204 and the ground pin 206 according to the metal material by a predetermined distance.

In short, the dielectric resonator antenna, particularly the planar inverted F antenna, of the present embodiment includes a dielectric resonator 208 that is excited by the loop current 220 to implement a specific resonant frequency. That is, the dielectric resonator antenna is a hybrid antenna that implements at least two resonant frequencies using the radiator 202 and the dielectric resonator 208, and implements broadband. For example, the dielectric resonator antenna uses the radiator 202 to provide a DCS band (1.71 GHz to 1.88 GHz), a PCS band (1.75 GHz to 1.87 GHz), a W-CDMA band (1.92 GHz to 2.17 GHz), and a Wibro band. (1.71 GHz to 2.39 GHz) and the like, and the WLAN band (5.725 GHz to 5.85 GHz) may be implemented using the dielectric resonator 208.

Although not described above, since the dielectric resonator 208 is located underneath the radiator 202, the electrical length of the radiator 202 is increased, resulting in a smaller radiator 202 equal to the larger radiator. The resonance frequency can be realized. That is, the dielectric resonator 208 may reduce the size of the radiator 202 by increasing the electrical length of the radiator 202 as well as independently implementing a resonant frequency different from that of the radiator 202.

In the above, a flat type inverted-f antenna is used as the dielectric resonator antenna of the present embodiment, but it can be applied to various antennas as long as it includes a dielectric resonator that is excited by a loop current to implement a specific resonance frequency.

3 is a perspective view illustrating a dielectric resonator antenna according to another exemplary embodiment of the present invention.

Referring to FIG. 3A, the slit 300 may be additionally formed in the radiator 202 in the antenna of the present embodiment. As a result, two or more resonant frequencies may be implemented by the radiator 202 because the current applied through the feed pin 204 diverges in multiple paths. Thus, the antenna of this embodiment can implement at least three resonant frequencies. Here, the shape of the slit 300 and the structure of the radiator 202 itself may be variously modified according to the number and band of resonant frequencies to be implemented without being limited to a specific shape.

Referring to FIG. 3B, unlike the antenna described above, in the antenna of the present embodiment, the ground plate 200 may be made of a metal material except for a portion where the dielectric resonator 208 is located.

Referring to FIG. 3C, in the antenna of the present embodiment, the size of the dielectric resonator 208 may be larger than that of the radiator 202.

Referring to FIG. 3D, in the antenna of the present exemplary embodiment, the dielectric resonator 208 may be located at the outer side of the antenna 202 instead of at the lower end of the radiator 202. Of course, even in this case, the dielectric resonator 208 is excited by the magnetic current source due to the loop current 220.

Referring to FIG. 3E, in the antenna of the present embodiment, the dielectric resonator 208 may have a cylindrical shape instead of a rectangular parallelepiped shape. That is, the dielectric resonator 208 may have various shapes as long as the dielectric resonator 208 is excited by the loop current 220.

In other words, in the dielectric resonator antenna of the present invention, the arrangement of the ground plate 200, the shape of the radiator 202, the position and shape of the dielectric resonator 208 may be changed according to the resonance frequency and frequency band to be implemented. have.

4 is a perspective view illustrating a dielectric resonator antenna (dimensions indicated) of the present invention, and FIG. 5 is a diagram illustrating reflection coefficient characteristics of a general antenna and the antenna of FIG. 4.

Referring to FIG. 4, the size of the ground plate 200 was set to 25 mm × 60 mm, and the size of the radiator 202 was set to 13 mm × 10 mm. In addition, the size of the dielectric resonator 208 was set to 11 mm x 9 mm x 4 mm, and the dielectric constant of the dielectric resonator 208 was set to 32.

Although not shown in FIG. 4, in the general antenna shown in FIG. 1, the size of the ground plate 100 was set to 25 mm × 60 mm, and the size of the radiator 102 was set to 13 mm × 10 mm.

Hereinafter, the reflection coefficient characteristics of the general antenna as shown in FIG. 1 and the antenna of this embodiment shown in FIG. 4 will be described.

Referring to FIG. 5, a general antenna without a dielectric resonator implements only one resonant frequency through a radiator as shown in the reflection coefficient characteristic curve 500, whereas the antenna of this embodiment has a reflection coefficient characteristic curve ( It is confirmed that at least two resonant frequencies are implemented using the radiator 202 and the dielectric resonator 208 as shown at 502. Here, the resonant frequency of about 2 kHz band is implemented by the radiator 202, and the resonant frequency of about 5.7 kHz band, which is a high frequency band, is implemented by the dielectric resonator 208. That is, when the radiator 202 implements the DCS band, the PCS band, the W-CDMA band, the Wibro band, or the like, the dielectric resonator 208 may independently implement the WLAN band.

In addition, as the dielectric resonator 208 is positioned below the radiator 202, the electrical length of the radiator 202 is increased to confirm that the resonant frequency of about 2.8 kHz is shifted to the resonant frequency of about 2 kHz. In this case, when the resonance frequency of about 2 kHz is to be realized in the general antenna, the size of the radiator of the general antenna should be larger than the size set above. That is, when implementing the same resonance frequency, the size of the antenna radiator 202 of the present embodiment may be smaller than that of the general antenna. In other words, the antenna of the present embodiment reduces the size of the radiator 202 by placing the dielectric resonator 208 at the bottom of the radiator 202 to increase the electrical length of the radiator 202.

In addition, it is confirmed that the antenna of the present embodiment implements a wider bandwidth than a general antenna.

In other words, the dielectric resonator antenna of the present embodiment may implement the multi band and the wide band by using the dielectric resonator 208 and reduce the size of the radiator 202.

In the above, the dielectric constant of the dielectric resonator 208 is set to 32, but the dielectric resonator 208 may be set to another dielectric constant. Of course, in this case, the resonant frequency of the dielectric resonator antenna will vary.

6 is a diagram illustrating a radiation pattern of a dielectric resonator antenna according to an exemplary embodiment of the present invention. Specifically, FIG. 6 (A) shows a radiation pattern of 1.71 GHz band, FIG. 6 (B) shows a radiation pattern of 2.39 GHz band, and FIG. 6 (C) shows a radiation pattern of 5.8 GHz band. It was.

As shown in Fig. 6, the antenna of this embodiment forms an omnidirectional radiation pattern, i.e., has a radiation pattern similar to that of the monopole antenna. Therefore, the antenna of the present embodiment can be used embedded in the mobile communication terminal.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

1 is a perspective view showing a general flat type inverted F antenna.

2 is a circuit diagram illustrating a dielectric resonator antenna according to an embodiment of the present invention.

3 is a perspective view illustrating a dielectric resonator antenna according to another exemplary embodiment of the present invention.

4 is a perspective view showing a dielectric resonator antenna (dimensions indicated) of the present invention.

5 is a diagram illustrating reflection coefficient characteristics of a general antenna and the antenna of FIG. 4.

6 is a diagram illustrating a radiation pattern of a dielectric resonator antenna according to an exemplary embodiment of the present invention.

Claims (9)

Ground plate; A radiator arranged spaced apart from the ground plate; A dielectric resonator disposed between the ground plate and the radiator and formed of a predetermined dielectric; A ground pin coupled between the ground plate and the radiator; And Including a feed pin for feeding to the radiator, And the dielectric resonator is excited by a loop current formed by the ground plate, the ground pin, the radiator and the feed line to implement a specific resonance frequency. According to claim 1, wherein the ground plate has a structure in which a metal material is formed on the dielectric substrate, And a metal material does not exist on a portion of the ground plate, and the dielectric resonator unit is positioned in a portion where the metal material does not exist in the ground plate. The dielectric resonator antenna of claim 2, wherein the dielectric resonator is located at a lower end of the radiator among the ground plates. The dielectric resonator antenna of claim 1, wherein the dielectric resonator is positioned between the ground plate and the radiator and is spaced apart from the radiator by a predetermined distance. The dielectric resonator antenna according to claim 1, wherein said radiator functions as a ground with respect to said dielectric resonator. Ground plate; A radiator arranged spaced apart from the ground plate; And Located between the ground plate and the radiator, including a dielectric resonator consisting of a predetermined dielectric, And the dielectric resonator is excited by a magnetic current source to implement a specific resonant frequency. The method of claim 6, wherein the antenna, A ground pin coupled between the ground plate and the radiator; And Including a feed pin for feeding to the radiator, And said magnetic current source is generated by a loop current formed by said ground plate, said ground pin, said radiator and said feed line. The method of claim 7, wherein the ground plate has a structure in which a metal material is formed on the dielectric substrate, The metal material does not exist on a portion of the ground plate, and the dielectric resonator is located in the portion of the ground plate where the metal material does not exist. The dielectric resonator antenna of claim 8, wherein the dielectric resonator is located at a lower end of the radiator among the ground plates.

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