KR100998153B1 - Antenna system - Google Patents

Abstract

Disclosed is an antenna system having excellent antenna characteristics such as antenna gain characteristics and beam width, and capable of minimizing size. The antenna system includes a ground portion providing a ground plane and an antenna portion vertically coupled to the ground portion, the antenna portion including a plurality of antenna elements and partitioned into a plurality of sectors. The sectors are defined as spaces between antenna parts neighboring each other, and the antenna parts prevent interference between the plurality of sectors. Therefore, by using the ground portion to place the antenna element vertically above the ground portion to form a high antenna gain Yagi antenna, by separating the antenna portion at 120 ° intervals to prevent interference between neighboring sectors and to improve the isolation degree Improve.

Yagi antenna, log periodic antenna (LP antenna), ground use Yagi antenna, repeater, image equivalent system

Description

Antenna system {ANTENNA SYSTEM}

The present invention relates to an antenna system, and provides an antenna system capable of minimizing interference between neighboring sectors and antennas in an antenna system divided into a plurality of sectors and improving antenna characteristics such as antenna gain and beam width.

In general, the relay device is used to solve the shadow area of the radio wave in the mobile communication system. The repeater performs a function of receiving and amplifying a weak radio wave and then transmitting the amplified signal again. The repeater is provided with one or two or more separate antennas.

The commercially available repeater system may use a repeater for the service of an indoor space such as an office, a movie theater, a movie theater, etc. In this case, call interruption or degradation of call quality may occur due to interference between repeater signals. In addition, when there are a plurality of repeaters, interference between the repeaters may occur.

In order to solve this problem, a technique for minimizing interference by applying a concept divided into n sectors of a mobile communication base station to a repeater system has been developed. In other words, the n divided sectors determine the location of the user so that only the sector in which the user is located is provided with a signal to the corresponding sector and no signal is provided to the remaining sectors. If the sector in which the user is located changes, the signals of the sectors are sequentially provided. This type of operation has the advantage of minimizing mutual interference when multiple repeater systems are present and enabling power control according to the usage of each sector, thereby minimizing power consumption.

It is well known that antennas are used in such repeater systems. Antennas applied to the system, if partitioned into three sectors (n = 3), have a beamwidth of 120 degrees and require a high gain antenna. In addition, the isolation characteristics between the antennas are also important, and since they are often used indoors, they must be small in size.

As the antenna used here, a yagi antenna may be considered. Yagi antennas are separated by approximately 1/4 of the wavelength (0.75 m at 100 MHz) with a shorter length of metal rods before and after the dipole antenna (1.5 m at 100 MHz), which is half of the radio wave to be received. It is a placed antenna. However, conventional Yagi antennas have a high directivity. That is, when used as a transmission antenna, the output of the transmitter can be concentrated to one side, and when used as a reception antenna, sensitivity is sensitive to one direction. This conventional Yagi antenna is shown in FIG. 1.

As shown in FIG. 1, the yagi antenna 10 is provided with an intermediate rod 11, and a reflector 12, a radiator 13, and a reflector 12 in a direction perpendicular to the intermediate rod 11, respectively. A director 14 is provided.

Usually the length of the reflector 12 is formed to be one half wavelength or slightly longer than one half wavelength, in order to allow the reflector 12 to have an inductive reactance. The director 14 may improve the gain when the number is added, and the yagi antenna 10 is generally used because of its simple structure and high gain.

However, considering that antennas implemented on a repeater or sector-by-sector basis require high gain, isolation, and the like, the antennas currently used cannot satisfy all of these conditions. Is no exception. Therefore, it is an urgent time to study the optimal antenna used to operate sector by sector in the repeater system.

The present invention is to solve the above-mentioned problems, to provide an antenna system capable of preventing interference between a plurality of repeaters and antennas.

In addition, the present invention is to provide an antenna system excellent in high gain and isolation characteristics.

In addition, the present invention is to provide an antenna system that minimizes the size of the antenna so that it can be used indoors as well as outdoors.

In addition, the present invention is to provide an antenna system having a high gain characteristics.

According to embodiments of the present invention for achieving the above object of the present invention, the antenna system is vertically coupled to the ground portion and the ground portion that provides a ground plane, comprising a plurality of antenna elements and divided into a plurality of sectors It is made to include an antenna unit. The sectors are defined as spaces between antenna parts neighboring each other, and the antenna parts prevent interference between the plurality of sectors.

In an embodiment, the antenna unit may be a Yagi antenna. Alternatively, the antenna unit may be a logarithmic antenna.

In an embodiment, the antenna unit is formed between a plurality of antenna elements including a reflector element, a radiator element, and a director element and the plurality of antenna elements to support the antenna elements. It includes a plurality of antenna plates. Here, the plurality of antenna elements have a bar shape and are disposed on the same plane in the antenna plate, and the antenna elements are disposed to be perpendicular to the ground portion.

In an embodiment, the antenna portion and the ground portion are coupled using soldering. In addition, a port for feeding power is provided between the radiator element and the ground portion. For example, the radiator element and the ground portion are soldered together. Alternatively, the reflector element and the ground portion may be further soldered and combined.

In an embodiment, the antenna plate is formed with a plurality of slots, and the slot is formed by partially opening a portion of the antenna plate to which the antenna plate and the ground portion are coupled between the antenna elements.

In an embodiment, the antenna portion is coupled to each other at the center portion of the ground portion and the three antenna portions arranged radially 120 degrees apart are arranged spaced apart from each other at equal intervals.

In an embodiment, the reflector element is coupled to each other, and the radiator element is provided at the free end side of the antenna plate.

In an embodiment, the ground portion may be a plate in which the antenna portion is mounted. Alternatively, the ground portion may be a plate in which the portion on which the antenna portion is mounted has a polygonal shape.

In an embodiment, the antenna system can control power for each sector, thereby reducing power consumption.

In addition, the antenna system may be changed in the sector serviced to correspond to the movement of the user when the user moves.

According to the present invention, first, by dividing the antenna system into three sectors, it is possible to determine the location of the user and to service the user only in a specific sector. do.

In addition, when a plurality of repeater systems are installed in a narrow indoor space, interference between the repeater systems may be minimized.

Second, power consumption can be controlled for each sector, thereby minimizing power consumption.

Third, since the ground portion acts as an antenna using the image components below the ground portion, the size can be minimized and can be used not only outdoors but also indoors.

Fourth, the antenna plate is divided into three or a plurality of sectors, and is separated for each sector partitioned as described above, so that the antenna system has excellent isolation characteristics.

In addition, radiation patterns and gain characteristics are uniformly measured for each sector.

Fifth, since the antenna has a wide beam width (more than 120 °), it has a high gain characteristic.

Sixth, by minimizing the number of solder portions for coupling the antenna portion and the ground portion, and directly connecting the port for feeding the antenna to the ground portion, it is possible to reduce the assembly process and production process and cost of the antenna system.

Although the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, the present invention is not limited or restricted by the embodiments.

Hereinafter, the concept of an antenna system according to embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3. 2 is a view for explaining a Yagi antenna or logarithmic antenna in the antenna system according to the embodiments of the present invention, Figure 3 is a view for explaining the concept of the antenna system according to the embodiments of the present invention .

First, referring to FIG. 2, the antenna system 20 includes an antenna element 25 and a ground portion 21 including a reflector 22, a radiator 23, and a director 24. ) And an image unit 35.

As an example, the antenna element 25 may be a device that forms a yagi antenna having a high gain as a simple structure. Meanwhile, the antenna element 25 may be a log periodic antenna (LP antenna). Here, the algebraic antenna is an antenna formed by constantly arranging a ratio of lengths or intervals of adjacent antenna elements. An antenna having a structural form in which impedance and radiation characteristics repeat logarithmically or periodically with respect to frequency, and a frequency band. Since the characteristic change is not large, it is regarded as a frequency independent antenna.

In the antenna element 25, the reflector 22, the radiator 23 and the director 24 serve as an antenna. In general, the reflector 22 is formed to have a length slightly longer than 1/2 wavelength or 1/2 wavelength.

The ground portion 21 serves as a ground plane of the reflector 22, the radiator 23, and the director 24, and the lower portion of the ground portion 21 based on the ground portion 21. The image unit 35 is formed to be symmetrical with the antenna element 25. That is, the image part 35 is formed with a reflector image 32, a radiator image 33 and a director image 34 symmetrically with respect to the antenna element 25, respectively.

Referring to FIG. 3, the antenna element 25 and the image part 35 are formed to be symmetrical with respect to the ground part 21, and the antenna element 25 is disposed above the ground part 21. An electric field equivalent to that generated by the electric field is also formed in the lower portion of the ground portion 21. Here, as described above, a virtual antenna element capable of forming an equivalent electric field formed under the ground portion 21 can be estimated, and the virtual antenna element estimated as described above becomes the image portion 35. .

In addition, the antenna element 25 and the image unit 35 combine with each other to form a single antenna to operate. Therefore, by using the ground portion 21, the antenna element 25 may be formed only on the ground portion 21 to form an antenna including the image portion 35, and the antenna system 20 Since the ground part 21 and the antenna element 25 are configured, the size of the antenna system 20 can be reduced.

Hereinafter, embodiments for substantially implementing the antenna system 20 as described above and antenna characteristics according to the embodiments will be described in detail with reference to the accompanying drawings. In the following description, the yagi antenna is used as the antenna element 25 as an example. However, the present invention is not limited to the Yagi antenna, and it is possible to apply the antenna system according to the present invention to the logarithmic antenna in the same manner.

First Example

Hereinafter, the antenna system according to the first embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5. 4 is a perspective view of an antenna system according to an exemplary embodiment of the present invention, and FIG. 5 is a front view illustrating main parts of a structure of a first antenna in the antenna system of FIG. 4.

Referring to FIG. 4, the antenna system 100 is a Yagi antenna including an image portion (not shown) formed by the ground portion 121, and includes an antenna portion 150 and a ground portion 121. .

The antenna unit 150 is provided perpendicular to the ground unit 121, and divides the round unit 121 and the antenna system 100 into a plurality of sectors α, β, and γ. In the present embodiment, the antenna system 100 is provided with three antenna units 150 to divide the antenna system 100 into three sectors α, β, and γ. However, the present invention is not limited to the above-described embodiment, and the antenna system 100 may be partitioned into substantially various numbers of sectors.

Here, the sectors α, β, and γ are defined as spaces between the antenna units 150 neighboring each other, and the sectors α, β, and γ are areas for providing a service to a user. The sectors α, β, and γ adjacent to each other are separated from each other by the antenna unit 150. Therefore, according to the present invention, the isolation between the sectors α, β, and γ is excellent, so that the user is serviced in one of the sectors α, β, and γ (for example, the first sector α). If it is provided, the remaining two sectors (β, γ) does not provide a service to the user, it can effectively prevent the occurrence of interference or crosstalk. In addition, when the user moves, it is also possible to change the sectors α, β, and γ that provide a service according to the movement of the user.

On the other hand, in the present invention it is possible to control the power for each of the plurality of sectors (α, β, γ) partitioned as described above, thereby minimizing the power consumption of the antenna system 100.

The ground unit 121 provides a ground plane of the antenna unit 150 and provides a plane on which the antenna unit 150 is mounted. For example, the ground portion 121 has a plate shape having a circular surface on which the antenna portion 150 is mounted. Here, the ground portion 121 may have a substantially various shape including a polygon, such as a triangle or a square, on which the antenna unit 150 is mounted.

The first antenna 151, the second antenna 152, and the third antenna 153 are formed symmetrically with respect to the center of the ground portion 121, and are radially 120 from the center of the ground portion 121. Are arranged at intervals. That is, the sectors α, β, and γ are sectors of a fan shape having a central angle of 120 °. Here, the antenna unit 150 has a beam width of at least 120 ° or more, and has an advantage of having a high gain characteristic.

Hereinafter, the first antenna 151 will be described with reference to FIG. 5. Here, since the structures of the second and third antennas 512 and 513 are substantially the same as the first antenna 511, the description of the second and third antennas 512 and 513 will be omitted. However, in FIG. 4, for the components of the second and third antennas 512 and 513, the number of second digits among the reference numerals for the components of the first antenna 151 is changed (for example, 512. , 522, 523).

Referring to FIG. 5, the first antenna 151 is provided between the reflector element 512, the radiator element 513, and the director element 514 and the antenna element 515, which is an antenna element 515. The elements 515 may include a plurality of antenna plates 511 supporting each other.

The antenna element 515 may have a bar shape having a predetermined thickness and length. The antenna element 515 is disposed on one plane of the antenna plate 511 and is provided perpendicular to the ground portion 121 and disposed in parallel to each other. The antenna element 515 includes the reflector element 512, the radiator element 513, and the director element 514.

For example, the antenna element 515 is a Yagi antenna, which is slightly shorter than the antenna element in front of or behind the antenna element (eg, the reflector element 512) of a length to be received. Another antenna element may be disposed, wherein the distance between the two antenna elements may be arranged at intervals of about 1/4 wavelengths.

Alternatively, when the antenna element 515 is a logarithmic antenna, the antenna element 515 has a length of 1/4 wavelength of a frequency to be received and a ratio of distances between adjacent antenna elements is formed to be constant. In addition, the ratio of the lengths of the adjacent antenna elements is formed to be constant.

In addition, the antenna element 515 is provided with the reflector element 512 at the center portion of the ground portion 121 and goes to the end of the antenna plate 511, the radiator element 513 and the director element ( 514 are arranged in order.

The antenna plate 511 not only supports the antenna element 515 but also isolates adjacent sectors α, β, and γ from each other. In addition, the antenna plate 511 is provided perpendicular to the ground portion 121.

A port 516 for supplying power to the first antenna 151 is provided below the radiator element 513.

Solder points 517 are formed under the radiator 513 to solder the ground portion 121 to couple the first antenna 151 and the ground portion 121. Here, since the antenna unit 150 is provided with three antennas 511, 512, and 513, all three solder parts 517 are formed. Therefore, since the port 516 and the ground portion 121 are directly coupled, the structure of the antenna system 100 may be simplified and the production process and cost of the antenna system 100 may be reduced.

In addition, in order to secure the coupling of the antenna unit 150, it is also possible to further solder the lower portion of the reflector 512 to the ground portion 121. That is, the antenna unit 150 includes six solder parts 517 including three solder parts 517 of the port 516 and three solder parts 517 under the reflector 512. . According to the present exemplary embodiment, the antenna unit 150 and the ground unit 121 may be simplified while minimizing the number of solder portions 517 to simplify the production process of the antenna system 100, and reduce the production cost. Coupling force between) has the advantage that can be secured sufficiently.

On the other hand, as the antenna unit 150 is mounted perpendicular to the ground unit 121 and partitions the ground unit 121 into a plurality of areas, the antenna unit 150 is connected to the ground unit 121 by the antenna unit 150. Interference may occur in mounting components of the antenna system 100. In this embodiment, in order to prevent such a problem, a slot 518 is formed near the coupling portion of the antenna plate 511 and the ground portion 121. The slot 518 is formed in the antenna plate 511 except for the antenna element 515, that is, between the antenna elements 515, and is formed in the ground portion 121 in the antenna plate 511. Adjacent lower ends are formed with some openings. Therefore, the slot 518 connects the adjacent ground portions 121 to each other so that components can be freely mounted on the ground portions 121. However, the shape, position and size of the slot 518 is not limited by the drawings, and may be changed in various ways.

6 to 34, antenna characteristics of the antenna system 100 according to the first embodiment of the present invention will be described. In the present invention, antenna characteristics such as radiation pattern and gain characteristics, voltage standing wave ratio (VSWR), and isolation (isolation) of the antenna system 100 are measured. MHz, 2045 MHz, and 2170 MHz). In the present invention, the antenna characteristics of each of the antenna units 150 in the antenna system 100 were measured.

As described above, results of measuring antenna characteristics of the antenna system 100 are illustrated in FIGS. 8 to 34.

6 and 7 are a first plane (H-plane) (Fig. 6) and a second plane (E-plane) (Fig. 7) for measuring the radiation pattern of the antenna system according to the first embodiment of the present invention ) Are drawings. As shown in FIG. 6, the first plane is a plane parallel to the ground portion 121 in the antenna system 100. As shown in FIG. 7, the second plane is a plane perpendicular to the antenna unit 150.

First, the antenna characteristics of the first antenna 151 will be described.

8 to 13 are graphs illustrating radiation patterns and gain characteristics of the first antenna 151 (port 1) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. 4. 14 is a graph measuring the VSWR of the first antenna 151, and FIGS. 15 and 16 are isolation diagrams of the second antenna 152 and the third antenna 153 from the first antenna 151. Are graphs measured.

The first antenna 151 measures radiation patterns and gain characteristics as shown in FIGS. 8 and 9 in a frequency band of 1920 MHz. In addition, the first antenna 151 measures radiation patterns and gain characteristics as shown in FIGS. 10 and 11 in the frequency band of 2045 MHz, and as shown in FIGS. 12 and 13 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Therefore, as shown in FIGS. 8 to 13, it can be seen that the radiation pattern and gain characteristics of the first antenna 151 are uniformly obtained even when the frequency band used is different. In addition, it can be seen that the beam width of the first antenna 151 is 120 ° or more.

Referring to FIG. 14, the VSWR value of the first antenna 151 is approximately 1.514 dB.

Next, looking at the isolation of the first antenna 151, as shown in Figure 15, the isolation of the second antenna 152 is -24.53㏈, as shown in Figure 16, the third The isolation degree for the antenna 153 was -24.63 dB.

Next, the antenna characteristics of the second antenna 152 will be described.

17 to 22 are graphs illustrating radiation patterns and gain characteristics of the second antenna 152 (port 2) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. FIG. 23 is a graph measuring the VSWR of the second antenna 152, and FIGS. 24 and 25 are isolation diagrams of the first antenna 151 and the third antenna 153 from the second antenna 152. Are graphs measured.

The second antenna 152 measures radiation patterns and gain characteristics as shown in FIGS. 17 and 18 in the frequency band of 1920 MHz. In addition, the second antenna 152 measures radiation patterns and gain characteristics as shown in FIGS. 19 and 20 in the frequency band of 2045 MHz, and as shown in FIGS. 21 and 22 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Therefore, as shown in FIGS. 17 to 22, it can be seen that the radiation pattern and gain characteristics of the second antenna 152 are uniformly obtained even when the frequency band of use is changed. In addition, it can be seen that the beam width of the second antenna 152 is 120 ° or more.

Referring to FIG. 23, the VSWR value of the second antenna 152 is approximately 1.72 dB.

Next, referring to the isolation of the second antenna 152, as shown in FIG. 24, the isolation of the first antenna 151 is −24.36 μs, and as shown in FIG. The isolation degree for the antenna 153 was -24.63 dB.

Next, the antenna characteristics of the third antenna 153 will be described.

26 to 31 are graphs illustrating radiation patterns and gain characteristics of the third antenna 153 (port 3) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. 4. 32 is a graph measuring the VSWR of the third antenna 152, and FIGS. 33 and 34 are isolation diagrams of the first antenna 151 and the third antenna 152 from the third antenna 153. Are graphs measured.

The third antenna 153 measures radiation patterns and gain characteristics as shown in FIGS. 26 and 27 in the frequency band of 1920 MHz. In addition, the third antenna 153 measures radiation patterns and gain characteristics as shown in FIGS. 28 and 29 in the frequency band of 2045 MHz, and as shown in FIGS. 30 and 31 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Accordingly, as shown in FIGS. 26 to 31, it can be seen that the radiation pattern and the gain characteristics of the third antenna 153 are uniformly obtained even when the frequency band used varies. In addition, it can be seen that the beam width of the third antenna 153 is 120 ° or more.

Referring to FIG. 32, the VSWR value of the third antenna 153 is approximately 1.705 Hz.

Next, referring to the isolation of the third antenna 153, as shown in FIG. 33, the isolation of the first antenna 151 is -24 GHz, and as shown in FIG. The isolation for antenna 152 was -24.59 Hz.

As described above, the antenna characteristics of the antenna system 100 according to the first embodiment are shown in Table 1.

2nd Example

On the other hand, in the above-described first embodiment, the ground part is circular, which has been described as an example. However, as a modified embodiment of the above-described first embodiment, an antenna system having a rectangular ground part will be described in the second embodiment. Here, since the second embodiment is substantially the same as the above-described first embodiment except for the shape of the ground portion, the same components and the same reference numerals are used for the same components, and overlapping descriptions will be omitted. 35 is a perspective view illustrating an antenna system according to a second embodiment of the present invention.

Referring to FIG. 35, the antenna system 100 includes an antenna unit 150 and a ground unit 131, and an image unit (not shown) of the antenna unit 150 is formed by the ground unit 131. It is an antenna that acts as a Yagi antenna.

The antenna unit 150 is provided with three antennas 151, 152, and 153 perpendicular to the ground part 131, and the three antennas 151, 152, and 153 are connected to the antenna system 100 and the The ground portion 131 is divided into three sectors α, β, and γ, and the neighboring sectors α, β, and γ are separated from each other. For example, in the antenna unit 150, the three antennas 151, 152, and 153 are radially disposed at intervals of 120 ° from the center point of the ground unit 131.

The antenna unit 150 includes an antenna element 515 including a reflector element 512, a radiator element 513, and a director element 514, and an antenna plate 511 supporting the antenna element 515.

The ground part 131 provides a ground plane of the antenna part 150, and is, for example, a plate having a rectangular surface on which the antenna part 150 is mounted. Since the shape of the ground portion 131 is different from that of the first embodiment described above, the antenna characteristics of the antenna system according to the first and second embodiments also vary.

Hereinafter, antenna characteristics of the antenna system 100 according to the second exemplary embodiment of the present invention will be described with reference to FIGS. 36 to 62. In the present invention, antenna characteristics such as the radiation pattern and gain characteristics, VSWR, and isolation of the antenna system 100 were measured and measured in three frequency bands (1920 MHz, 2045 MHz, and 2170 MHz), respectively. In addition, in the present invention, the antenna characteristics of each of the three antenna units 150 were measured.

First, the antenna characteristics of the first antenna 151 will be described.

36 to 41 are graphs illustrating radiation patterns and gain characteristics of the first antenna 151 (port 1) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. FIG. 42 is a graph measuring the VSWR of the first antenna 151, and FIGS. 43 and 44 are isolation diagrams of the second antenna 152 and the third antenna 153 from the first antenna 151. Are graphs measured.

The first antenna 151 measures radiation patterns and gain characteristics as shown in FIGS. 36 and 37 in the frequency band of 1920 MHz. In addition, the first antenna 151 measures the radiation pattern and the gain characteristics as shown in FIGS. 38 and 39 in the frequency band of 2045 MHz, and as shown in FIGS. 40 and 41 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Accordingly, as shown in FIGS. 36 to 41, it can be seen that the radiation pattern and gain characteristics of the first antenna 151 are uniformly obtained even when the frequency band of use is different. In addition, it can be seen that the beam width of the first antenna 151 is 120 ° or more.

Referring to FIG. 42, the VSWR value of the first antenna 151 is about 1.608 Hz.

Next, referring to the isolation of the first antenna 151, as shown in FIG. 43, the isolation of the second antenna 152 is −25.43 μs, and as shown in FIG. The isolation degree for the antenna 153 was -25.64 dB.

Next, the antenna characteristics of the second antenna 152 will be described.

45 to 50 are graphs showing radiation patterns and gain characteristics of the second antenna 152 (port 2) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. FIG. 51 is a graph measuring the VSWR of the second antenna 152, and FIGS. 52 and 53 are isolation diagrams of the first antenna 151 and the third antenna 153 from the second antenna 152. Are graphs measured.

The second antenna 152 measures radiation patterns and gain characteristics as shown in FIGS. 45 and 46 in the frequency band of 1920 MHz. Also, the second antenna 152 measures radiation patterns and gain characteristics as shown in FIGS. 47 and 48 in the frequency band of 2045 MHz, and as shown in FIGS. 49 and 50 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Accordingly, as shown in FIGS. 45 to 50, it can be seen that the radiation pattern and gain characteristics of the second antenna 152 are uniformly obtained even when the frequency band of use is changed. In addition, it can be seen that the beam width of the second antenna 152 is 120 ° or more.

Referring to FIG. 51, the VSWR value of the second antenna 152 is approximately 1.624 dB.

Next, referring to the isolation of the second antenna 152, as shown in FIG. 52, the isolation of the first antenna 151 is −28.14 μs, and as shown in FIG. The isolation degree for the antenna 153 was -25 dB.

Next, the antenna characteristics of the third antenna 153 will be described.

54 to 59 are graphs illustrating radiation patterns and gain characteristics of the third antenna 153 (port 3) according to each frequency (1920 MHz, 2045 MHz, 2170 MHz) in the antenna system of FIG. FIG. 60 is a graph measuring the VSWR of the third antenna 152, and FIGS. 61 and 62 are isolation diagrams of the first antenna 151 and the third antenna 152 from the third antenna 153. Are graphs measured.

The third antenna 153 measures radiation patterns and gain characteristics as shown in FIGS. 54 and 55 in the frequency band of 1920 MHz. In addition, the third antenna 153 measures radiation patterns and gain characteristics as shown in FIGS. 56 and 57 in the frequency band of 2045 MHz, and as shown in FIGS. 58 and 59 in the frequency band of 2170 MHz. The same radiation pattern and gain characteristics are measured. Therefore, as shown in FIGS. 54 to 59, it can be seen that the radiation pattern and the gain characteristics of the third antenna 153 are uniformly obtained even when the frequency band of use is changed. In addition, it can be seen that the beam width of the third antenna 153 is 120 ° or more.

Referring to FIG. 60, the VSWR value of the third antenna 153 is approximately 1.632 dB.

Next, referring to the isolation of the third antenna 153, as shown in FIG. 61, the isolation of the first antenna 151 is −28.19 μs. As illustrated in FIG. 62, the second The isolation for antenna 152 was -25.23 dB.

As described above, the antenna characteristics of the antenna system 100 according to the second embodiment are shown in Table 2.

63 is a diagram for describing various modified embodiments of the logarithmic antenna according to the exemplary embodiments of the present invention.

As shown in FIG. 63, in the antenna system 100, an array of antenna elements forming a logarithmic antenna is formed such that three bars are spaced apart at regular intervals, such as a yagi antenna (FIG. 63 (a In addition, a plurality of bars are arranged on a plane perpendicular to each other, but arranged in a zigzag form (FIG. 63 (b)), a shape in which a serrated wedge is arranged (FIG. 63 (c)), and a trapezoidal lead shape (FIG. 63 (d)), densely arranged conductive wire shapes (Fig. 63 (e)), and trapezoidal conductive wire shapes (Fig. 63 (f)) arranged in a sawtooth shape. Further, in addition to the illustrated form, the arrangement of the antenna elements may have a sawtooth-shaped trapezoidal plane, a sawtooth trapezoidal wedge shape, a trapezoidal wedge wire shape, a zigzag wire shape, and the like. It can be variously changed.

According to the present invention, by dividing the antenna system 100 into three sectors (α, β, and γ), it is possible to determine the location of the user and to service the user only from a specific sector. At the same time, services are available in different sectors.

When a plurality of repeater systems are installed in a narrow indoor space, interference between the repeater systems can be minimized, and the amount of power according to the usage can be controlled for each cell, thereby minimizing low power consumption.

In addition, according to the present invention can be implemented by minimizing the size can be used not only outdoors but also indoors.

In addition, according to the present invention, the antenna unit 150 is divided into three or a plurality of sectors (α, β, and γ), and has an advantage of excellent isolation characteristics for each sector partitioned as described above.

Further, according to the present invention, the ground parts 121 and 131 are used to act as antennas by using the image components below the ground parts 121 and 131.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 illustrates an example of a yagi antenna according to the prior art;

2 is a view for explaining the concept of Yagi antenna or log period antenna in the antenna system according to an embodiment of the present invention;

3 is a view for explaining the concept of an antenna system according to an embodiment of the present invention;

4 is a perspective view for explaining an antenna system according to a first embodiment of the present invention;

5 is a front view illustrating main parts of the coupling structure in the antenna system of FIG. 4;

6 is a diagram defining a first plane (H-plane) for measuring a radiation pattern of an antenna system according to embodiments of the present invention;

FIG. 7 illustrates a second plane (E-plane) for measuring a radiation pattern of an antenna system according to embodiments of the present disclosure; FIG.

FIG. 8 is a graph showing in a first plane the radiation pattern and gain characteristics of the first antenna (port 1) at 1920 MHz in the antenna system of FIG.

FIG. 9 is a graph showing, in a second plane, the radiation pattern and gain characteristics of the first antenna at 1920 MHz in the antenna system of FIG.

FIG. 10 is a graph showing, in a first plane, the radiation pattern and gain characteristics of the first antenna at 2045 MHz in the antenna system of FIG.

FIG. 11 is a graph showing, in a second plane, the radiation pattern and gain characteristics of the first antenna at 2045 MHz in the antenna system of FIG. 4; FIG.

FIG. 12 is a graph showing, in a first plane, the radiation pattern and gain characteristics of the first antenna at 2170 MHz in the antenna system of FIG.

FIG. 13 is a graph showing, in a second plane, the radiation pattern and gain characteristics of the first antenna at 2170 MHz in the antenna system of FIG.

14 is a graph illustrating the voltage standing wave ratio (VSWR) of the first antenna in the antenna system of FIG.

FIG. 15 is a graph illustrating isolation of a second antenna of a first antenna in the antenna system of FIG. 4; FIG.

FIG. 16 is a graph illustrating isolation for a third antenna of a first antenna in the antenna system of FIG. 4; FIG.

FIG. 17 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a second antenna (port 2) at 1920 MHz in the antenna system of FIG.

FIG. 18 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 1920 MHz in the antenna system of FIG.

FIG. 19 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a second antenna at 2045 MHz in the antenna system of FIG.

FIG. 20 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 2045 MHz in the antenna system of FIG.

FIG. 21 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a second antenna at 2170 MHz in the antenna system of FIG.

FIG. 22 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 2170 MHz in the antenna system of FIG. 4; FIG.

FIG. 23 is a graph showing the VSWR of the second antenna in the antenna system of FIG. 4; FIG.

FIG. 24 is a graph illustrating an isolation diagram for a first antenna of a second antenna in the antenna system of FIG. 4; FIG.

FIG. 25 is a graph illustrating isolation for a third antenna of a second antenna in the antenna system of FIG. 4; FIG.

FIG. 26 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna (port 3) at 1920 MHz in the antenna system of FIG. 4;

27 is a graph showing, in a second plane, the radiation pattern and the gain characteristic of the third antenna at 1920 MHz in the antenna system of FIG.

28 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna at 2045 MHz in the antenna system of FIG.

FIG. 29 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a third antenna at 2045 MHz in the antenna system of FIG.

30 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna at 2170 MHz in the antenna system of FIG. 4;

FIG. 31 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a third antenna at 2170 MHz in the antenna system of FIG. 4; FIG.

32 is a graph illustrating VSWR of a third antenna in the antenna system of FIG. 4; FIG.

FIG. 33 is a graph illustrating isolation of the first antenna of the third antenna in the antenna system of FIG. 4; FIG.

FIG. 34 is a graph illustrating isolation for a second antenna of a third antenna in the antenna system of FIG. 4; FIG.

35 is a perspective view for explaining an antenna system according to a second embodiment of the present invention;

36 is a graph showing, in a first plane, the radiation pattern and gain characteristics of the first antenna (port 1) at 1920 MHz in the antenna system of FIG. 35;

FIG. 37 is a graph showing, in a second plane, the radiation pattern and the gain characteristic of the first antenna at 1920 MHz in the antenna system of FIG. 35; FIG.

FIG. 38 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a first antenna at 2045 MHz in the antenna system of FIG. 35; FIG.

FIG. 39 is a graph showing, in a second plane, the radiation pattern and gain characteristics of the first antenna at 2045 MHz in the antenna system of FIG. 35; FIG.

40 is a graph showing, in a first plane, the radiation pattern and gain characteristics of the first antenna at 2170 MHz in the antenna system of FIG. 35;

FIG. 41 is a graph showing, in a second plane, the radiation pattern and gain characteristics of the first antenna at 2170 MHz in the antenna system of FIG. 35; FIG.

FIG. 42 is a graph illustrating the VSWR of the first antenna in the antenna system of FIG. 35; FIG.

FIG. 43 is a graph illustrating isolation of a second antenna of a first antenna in the antenna system of FIG. 35; FIG.

FIG. 44 is a graph illustrating isolation for a third antenna of a first antenna in the antenna system of FIG. 35; FIG.

FIG. 45 is a graph showing in a first plane the radiation pattern and gain characteristics of a second antenna (port 2) at 1920 MHz in the antenna system of FIG. 35;

FIG. 46 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 1920 MHz in the antenna system of FIG. 35;

FIG. 47 is a graph showing, in the first plane, the radiation pattern and the gain characteristic of the second antenna at 2045 MHz in the antenna system of FIG. 35;

FIG. 48 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 2045 MHz in the antenna system of FIG. 35; FIG.

FIG. 49 is a graph showing, in a first plane, the radiation pattern and the gain characteristic of the second antenna at 2170 MHz in the antenna system of FIG. 35;

FIG. 50 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a second antenna at 2170 MHz in the antenna system of FIG. 35;

FIG. 51 is a graph showing the VSWR of the second antenna in the antenna system of FIG. 35; FIG.

FIG. 52 is a graph illustrating an isolation diagram of a first antenna of a second antenna in the antenna system of FIG. 35; FIG.

FIG. 53 is a graph illustrating isolation of a third antenna of a second antenna in the antenna system of FIG. 35; FIG.

FIG. 54 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna (port 3) at 1920 MHz in the antenna system of FIG. 35; FIG.

FIG. 55 is a graph showing, in a second plane, the radiation pattern and the gain characteristic of the third antenna at 1920 MHz in the antenna system of FIG. 35; FIG.

FIG. 56 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna at 2045 MHz in the antenna system of FIG. 35; FIG.

FIG. 57 is a graph showing, in a second plane, the radiation pattern and gain characteristics of a third antenna at 2045 MHz in the antenna system of FIG. 35; FIG.

FIG. 58 is a graph showing, in a first plane, the radiation pattern and gain characteristics of a third antenna at 2170 MHz in the antenna system of FIG. 35; FIG.

FIG. 59 is a graph showing, in a second plane, the radiation pattern and the gain characteristic of the third antenna at 2170 MHz in the antenna system of FIG. 35; FIG.

60 is a graph illustrating the VSWR of the third antenna in the antenna system of FIG. 35;

FIG. 61 is a graph illustrating isolation of the first antenna of the third antenna in the antenna system of FIG. 35; FIG.

FIG. 62 is a graph illustrating an isolation diagram of a second antenna of a third antenna in the antenna system of FIG. 35; FIG.

63 is a diagram illustrating examples of logarithmic antennas in an antenna system according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

20: antenna system 21: ground portion

22: reflector 23: radiator

24: director 25: antenna element

32, 33, 34, 35: Image part 100: Antenna system

121, 131: ground portion 150, 151, 152, 153: antenna portion

511, 521, and 531: antenna plates 512, 522, and 532: reflector elements

513, 523, 533: radiator element 514, 524, 534: director element

515: antenna element 516: port

517: solder point 518: slot

α, β, γ: sector

Claims (14)

A ground portion providing a ground plane; And An antenna unit vertically coupled to the ground unit, the antenna unit including a plurality of antenna elements and partitioned into a plurality of sectors defined as a space between neighboring antenna elements; Including, The antenna unit is a Yagi antenna or a log periodic antenna, And the antenna unit is configured to prevent interference between the plurality of sectors, wherein a signal is provided to the one sector to provide a service to a user in one of the plurality of sectors. delete delete The method of claim 1, The antenna unit, A plurality of antenna elements including a reflector element, a radiator element and a director element; And A plurality of antenna plates formed between the plurality of antenna elements to support the antenna elements; Including, And the plurality of antenna elements have a bar shape and are disposed on the same plane in the antenna plate, and the antenna elements are disposed perpendicular to the ground portion. The method of claim 4, wherein And the antenna unit and the ground unit are coupled by soldering. The method of claim 5, And a port for power feeding between the radiator element and the ground portion, wherein the radiator element and the ground portion are soldered to each other. The method of claim 6, And a solder joint of the reflector element and the ground portion. The method of claim 4, wherein The antenna plate is formed with a plurality of slots, And the slot is formed by partially opening a portion of the antenna plate to which the antenna plate and the ground portion are coupled between the antenna elements. The method of claim 4, wherein And the antenna unit includes three antenna units coupled to each other at a central portion of the ground portion and disposed radially at intervals of 120 °. 10. The method of claim 9, The antenna unit is coupled to the reflector element side, the antenna system, characterized in that the radiator element is provided on the free end side of the antenna plate. The method of claim 1, And the ground portion is a plate in which the portion on which the antenna portion is mounted is a circular plate. The method of claim 1, The ground unit is an antenna system, characterized in that the portion on which the antenna unit is mounted is a plate having a polygonal shape. The method of claim 1, An antenna system, characterized in that the power control is possible for each sector. delete

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