KR20100073946A - Dual-band dual-polarized base station antenna for mobile communication - Google Patents

Abstract

PURPOSE: A dual band dual polarized antenna for a mobile communications base station is provided to facilitate the design of an antenna by appropriately controlling the number of a first and a second radiation device module and an interval. CONSTITUTION: A first and a second radiation module are arranged on a reflector. The first radiation device module receives and transmits two linear orthogonal polarizations for a first frequency band. The first radiation module includes a first or a fourth dipole(10-1~10-4). The first or the fourth dipole is arranged into an X-shaped pattern. The first and the third dipole are arranged at the angle of +45 degrees. The second and the fourth dipole are arranged at the angle of -45 degrees. The second radiation device transmits and receives two linear orthogonal polarizations for a second frequency band.

Description

Dual-Band Dual-Polarized Antenna for Mobile Communications Base Stations {DUAL-BAND DUAL-POLARIZED BASE STATION ANTENNA FOR MOBILE COMMUNICATION}

The present invention relates to a dual band dual polarization antenna for diversity in a base station antenna of mobile communication (PCS, Cellular, IMT-2000, etc.).

Antennas for mobile communication base stations are designed using spatial diversity or polarization diversity to reduce fading. The spatial diversity method is to install a transmitting antenna and a receiving antenna spaced apart by a predetermined distance, which is not only limited in terms of space but also in terms of cost. Accordingly, the mobile communication system generally uses a dual band dual polarized antenna by applying a polarization diversity scheme.

 Dual-band dual polarization antennas are used to transmit (or receive) two linear polarizations that are aligned at right angles to one another, for example vertically and horizontally. However, in practical applications it is very important to operate these antennas to align this polarization to +45 degrees and -45 degrees with respect to the vertical (or horizontal). Dual-band dual polarized antennas are generally operated in two frequency bands which are sufficiently spaced apart from each other. For such a dual band dual polarized antenna, there is exemplified what is disclosed in Korean Patent Application No. 2000-7010785 (name: dual polarized multiband antenna) filed by Katline-Berke Cage.

1 is a perspective view illustrating an exemplary dual band dual polarization antenna array, as disclosed in Korean Patent Application No. 2000-7010785. Referring to FIG. 1, a conventional dual band dual polarization antenna includes a first radiating element module 1 and a second frequency band (higher frequency band, hereinafter) for a first frequency band (lower frequency band, hereinafter referred to as low frequency band). And a second radiating element module (3) for high frequency band.

The two radiating element modules 1, 3 are arranged in front of the conductive reflecting plate 5, the shape of which is substantially square. The feed grid may be located on the rear surface of the reflector 5, through which the first and second radiating element modules 1 and 3 are electrically connected. The first radiating element module has a plurality of dipoles 1a which are generally arranged in a square shape, which are mechanically supported by the so-called balancing device 7 on the reflecting plate 5 or a plate located behind it. And also in electrical contact. At this time, both edges of the reflecting plate 5 have sidewalls 6 protruding at a suitable height from the plane to improve radiation characteristics.

The length of the dipole element of the first radiating element module 1 is set such that electromagnetic waves corresponding thereto are transmitted and received through the corresponding dipole element. Thus, in a dual polarized antenna the dipole elements are orthogonally aligned. Typically, each of these dipole elements 1a is precisely aligned at angles of +45 and -45 degrees with respect to the vertical (or with respect to the horizontal) to form a double polarization antenna, referred to simply as an X-polarized antenna.

The second radiating element module 3 may be located in or outside the first radiating element module 1 in the form of a square dipole. The second radiating element module 3 is not a square dipole but a cross dipole. The two dipoles 3a positioned at right angles to each other are likewise supported on the reflecting plate 5 through the balance net, and are fed through them.

The first and second radiating element modules 1 and 3 are precisely arranged at different distances in front of the reflecting plate 5. At this time, the second radiating element module 3 is arranged to be interleaved with the first radiating element module 1. In addition, as shown in FIG. 1, two antenna devices formed by the first and second radiating element modules 1 and 3 may be installed on the reflecting plate 5 in the vertical direction, and two antenna devices. An additional second radiating element module 3 ′ of the second frequency band may be installed in the space between the two. This arrangement allows for high vertical gain.

As such, there may be one exemplary configuration of a conventional dual band dual polarization antenna array, and in addition, the optimization structure of the dual band dual polarization antenna array and optimization of antenna size, stable characteristics, ease of beam width adjustment and antenna design Various studies are currently being conducted for ease of use.

An object of the present invention is to enable a more optimized structure arrangement and optimization of the antenna size, to have a stable antenna characteristics and a simpler structure, to move the beam width adjustment of the antenna and to facilitate the design of the antenna The present invention provides a dual band dual polarization antenna for a communication base station.

According to an aspect of the present invention to achieve the above object, a dual band dual polarization antenna for a mobile communication base station, comprising: a reflector; At least one first radiating element module formed on the reflecting plate and composed of a plurality of dipoles which are generally installed in an 'X' shape, for transmitting and receiving two linear quadrature polarizations for a first frequency band; And at least one second radiating element module for a second frequency band interleaved between the first radiating element modules on the reflecting plate.

According to another feature of the present invention, a dual band dual polarization antenna for a mobile communication base station, comprising: a reflector; At least one or more dipoles formed on the reflector and composed of a plurality of dipoles which are generally installed in a '>>' or '<<' shape to transmit and receive two linear quadrature polarizations for a first frequency band. A first radiating element module; And at least one second radiating element module for a second frequency band interleaved between the first radiating element modules on the reflecting plate.

The dual band dual polarization antenna according to the present invention enables more optimized structure arrangement and optimization of antenna size, has stable characteristics and simpler structure, and can bring about easy beam width adjustment and antenna design of the antenna. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific matters such as specific elements are shown, which are provided to help a more general understanding of the present invention. It is self-evident to those of ordinary knowledge in Esau.

2 is a perspective view of a dual band dual polarization antenna array according to a first embodiment of the present invention, FIG. 3 is a structural diagram of a dipole constituting the first radiating element module of FIG. 2, and FIG. 4 is a plan view of FIG. 2. 2 to 4, the dual band dual polarization antenna array according to the first embodiment of the present invention is somewhat similar to the conventional structure, first, a low frequency band (for example 800 MHz band installed in the front of the reflector 15) A plurality of second radiating element modules 20 of a high frequency band (for example, 2 GHz band) installed in a form disposed between the plurality of first radiating element modules 10 and the first radiating element module 10. It consists of

At this time, the detailed configuration of the first radiating element module 10 is different from the conventional. The first radiating element module 10 has an 'X' structure as a whole, rather than a conventional square structure to implement X polarization. That is, the first radiating element module 10 includes first to fourth dipoles 10-1, 10-2, 10-3, and 10-4, and includes first to fourth dipoles 10-1 to 4. 10-4) each form one end of the entire 'X' structure. As shown in FIG. 4, the first and third dipoles 10-1 and 10-3 form a +45 degree polarization, and the second and fourth dipoles 10-2 and 10-4 are − It will form a 45 degree polarization.

3 illustrates a detailed structure of the first dipole 10-1, with reference to the structure of the first to fourth dipoles 10-1 to 10-4 according to the present invention, The first to fourth dipoles 10-1 to 10-4 have a folded dipole structure.

The folded dipoles are divided into left and right ends so that the first and second side dipole elements 104 and 106 have a total length appropriately designed according to the frequency, and the first and second side dipole elements 104 and 106. ) And conductive feed baluns 102 of appropriately shaped shape to support the respective ones, feed lines 112 extending in the longitudinal direction of the baluns 102 and connected to the inner ends of the first side dipole elements 104. And a third side dipole element 108 extending in the longitudinal direction of the first and second side dipole elements 104 and 106 and connecting their outer ends to each other and parallel to the dipole elements 104 and 106. It is composed. In this case, the first and second side dipole elements 104 and 106, the balun 102, the feed line 112, and the third side dipole element 108 are designed in a metal pattern that is connected as a whole on one metallic plane. Can be made.

When a current is provided through the feed line 112 in the folded dipole, antenna mode electric fields are formed on the first and second side dipole elements 104 and 106 in the direction of the arrow as shown in FIG. The third side dipole element 108 is induced with an electric field in the same direction as the electric fields formed on the first and second side dipole elements 104 and 106 (see arrows in FIG. 3). The folded dipole has a simpler structure for feeding than the general dipole, and has a wider broadband characteristic and more stable antenna horizontal beamwidth variation.

In the first to fourth dipoles 10-1, 10-2, 10-3, 10-4 of the first radiating device module 10 according to the present invention using such a folded dipole, the first and third The dipoles 10-1 and 10-3 are installed to have a slope of +45 degrees, and according to the installed state, the +45 degrees polarization of +45 degrees out of the total polarizations of the antennas is induced to induce an electric field of +45 degrees which is directly formed. do. Similarly, the second and fourth dipoles 10-2 and 10-4 are installed to have a slope of -45 degrees, and are directly formed by arranging -45 degrees of polarizations among the total polarizations of the antenna according to the installed state. Induce an electric field of -45 degrees.

Meanwhile, in FIG. 2 and FIG. 4, the second radiating element module 20 is illustrated as an example of a PCB (Print Circuit Board) type radiating element. The second radiating element module 20 is illustrated in FIG. 1. A conventional general high frequency band radiating element module including the conventional second radiating element module 3 shown in the drawings may be applied.

2 and 4, for example, the first radiating element module 10 is installed at two places, and the second radiating element module 20 is, for example, the first radiation having a 'X' shape as a whole. It is installed one by one at the center position of the installation range of the element module 10 and the upper and lower positions, and the six second radiator element modules 20 are interleaved between the first radiating element modules 10 installed at two places. It is shown to be. However, this is for convenience of description and the total number of each of the first or second radiating element modules 10 and 20 and the distance between the modules may be appropriately modified according to the design of a specific antenna array.

5 is a perspective view of a dual band dual polarization antenna array according to a second embodiment of the present invention, FIG. 6 is a structural diagram of a folded dipole constituting the first radiating element module of FIG. 5, and FIG. 7 is a plan view of FIG. 5. to be. 5 to 7, the dual band dual polarization antenna array according to the second embodiment of the present invention may be installed in front of the reflector 15 in the same manner as the structure of the first embodiment shown in FIGS. 2 to 4. The first radiating device module 12 and the first radiating device module 12 is composed of a plurality of second radiating device module 20 is installed in a form that is disposed appropriately.

At this time, the detailed configuration of the first radiating element module 12 according to the second embodiment of the present invention is different from the configuration of the first embodiment. That is, as described in detail in FIG. 6, the first to fourth dipoles 12-1, 12-2, 12-3, and 12-4 constituting the first radiating element module 12 are described in the first embodiment. As shown in FIG. 4, the first through fourth dipoles 12-1 through 12-4 according to the second embodiment of the present invention have at least one of the outer ends of the dipole elements. It is characterized by having a bent portion (part A of FIG. 6). In the second embodiment shown in Figs. 5 to 7, it is shown by way of example that the outer ends of the dipole elements have a bent structure. At this time, the bent portion does not exceed more than half of the length of the entire dipole element.

In the conventional dipole structure, an electric field is strongly generated at the outer end of the dipole element, which affects the adjacent dipole element. When the folded dipole of the bent structure is used, a strong electric field is reduced in the dipole element to the adjacent dipole element. It becomes possible.

In addition, in the first embodiment of the present invention as shown in the portion shown by B1 in Figure 4, when the first radiating element module is arranged in the 'X' shape, the distance between each other in the center of the 'X' Strong coupling occurs, and different polarizations can be affected. At this time, in the second embodiment of the present invention, as shown in B2 of FIG. 7, the influence of the polarization can be reduced by spaced between different polarizations using folded dipoles having a curved structure.

8 is a plan view of a dual band dual polarization antenna array according to a third embodiment of the present invention. Referring to FIG. 8, the dual band dual polarization antenna array according to the third embodiment of the present invention may include first to fourth dipoles having folded dipole structures similar to those of the first embodiment shown in FIGS. 2 to 4. The first radiating element module 10 is configured by using (10-1 to 10-4), wherein the first radiating element module 10 is not a 'X' structure as a whole, but a '>>' or It has a '<<' character structure. That is, the structure of the third embodiment of the present invention can be seen that the first and second dipoles (10-1, 10-2) in the first embodiment of the 'X' structure is installed to be replaced with each other.

According to this configuration, in the first to fourth dipoles (10-1, 10-2, 10-3, 10-4) of the first radiating element module 10 according to the third embodiment of the present invention, the first And the third dipoles (10-1, 10-3) are installed in parallel with each other while having a slope of +45 degrees, and forms a +45 degree polarization directly of the total polarization of the antenna according to the installed state, respectively. Similarly, the second and fourth dipoles 10-2 and 10-4 are installed in parallel with each other having a slope of -45 degrees, and directly form a -45 degree polarization of the total polarizations of the antenna depending on the installed state. do.

Meanwhile, in FIG. 8, unlike the first embodiment in which the second radiating element module is installed in six places for each of the first radiating element modules 10 installed in two places, four second radiating element modules 20 are installed. It is shown. Thus, by combining the structure of the embodiment of the present invention, it is possible to bring the ease of antenna design, such as to properly adjust the optimized total number of each of the first or second radiating element module (10, 20) and the distance between each module, etc. Will be.

9 is a plan view of a dual band dual polarization antenna array according to a fourth embodiment of the present invention. Referring to FIG. 9, the dual band dual polarization antenna array according to the fourth embodiment of the present invention is illustrated in FIG. Mostly the same as the configuration of the third embodiment, wherein the first to fourth dipoles (12-1, 12-2, 12-3, constituting the first radiating element module 12 according to the fourth embodiment of the present invention) 12-4), it can be seen that the bent folded dipole structure is employed as in the second embodiment of the present invention shown in Figs.

10 is a plan view of a dual band dual polarization antenna array according to a fifth embodiment of the present invention. Referring to FIG. 10, the antenna array structure according to the fifth embodiment of the present invention is almost the same as that of the dual band dual polarized antenna array according to the first embodiment of the present invention shown in FIGS. 2 to 4. It can be seen that. However, the conductive balun 102 is formed in the structure of each of the first to fourth dipoles 10-1, 10-2, 10-3, and 10-4 for implementing X polarization in the 800 MHz first radiator module 10. ) Is positioned so as to be located on the left and right sides of the entire first radiating element module 10 so that its installation range is as far as possible without overlapping the installation range of the second radiating element module 20 in the 2 GHz band located on the central axis. . That is, as shown in FIG. 10, each of the baluns 102 is inclined in a form in which the lower end of the balun 102 is farther from the second radiating element module 20 than the upper end thereof.

This is because when the balun 102 of the first radiating element module 10 is disposed close to the second radiating element module 20 as in the first embodiment, a cross-polarization ratio (CPR) of 2 GHz band is obtained. ) This is to improve the property, because it may deteriorate.

As such, installing each of the baluns 102 inclined such that the lower end portion is farther from the second radiating element module 20 than the upper end portion may improve the CPR characteristics of the second radiating element module 20. have. In this case, the constituting each balun 102 may be applied to a structure in which the first radiating device module 10 is in the form of an 'X' as a whole, as shown in FIG. 1, as shown in FIG. 1. This also applies to structures that are generally rhombic in shape. In this case, when viewed from the front, the baluns are located outside of the rhombus structure, not in a range corresponding to the inside of the overall rhombus structure of the first radiating element module as in the related art.

11 is a plan view of a dual band dual polarization antenna array according to a sixth embodiment of the present invention. Referring to FIG. 11, the antenna array structure according to the fifth embodiment of the present invention is almost the same as that of the dual band dual polarization antenna array according to the second embodiment of the present invention shown in FIGS. 5 to 7. It can be seen. However, the conductive balun in the structure of the first to fourth dipoles (12-1, 12-2, 12-3, 10-4) of the 800MHz first radiating element module 12 as in the modification shown in FIG. It is configured to be located on the left and right sides of the entire first radiating device module 12 so that the installation range does not overlap with the installation range of the second radiating device module 20, as far as possible.

12 is a plan view of a dual band dual polarization antenna array according to a seventh embodiment of the present invention. 12, it can be seen that the antenna array according to the seventh embodiment of the present invention is almost similar to the structure of the fifth embodiment shown in FIG. However, in the antenna array according to the seventh embodiment of the present invention, it can be seen that the mutual arrangement structure between the first radiating element module 10 and the second radiating element module 20 is different from that of the fifth embodiment. have.

That is, in the structure shown in FIG. 10, for example, the first radiating element module 10 is installed in two places, and the second radiating element module 20 is, for example, the entire first 'X' shaped. The radiating element module 10 has been shown to be installed one at a central position and a vertical position in the center of the installation range. However, as shown in FIG. 12, in the antenna array structure according to the seventh embodiment, the second radiating element module 20 is not installed at the center position of the 'X' shape of the first radiating element module 10. The second radiating element module 20 (20-1, 20-1, 20-2 in FIG. 12) is located one by one outside the center position of the 'X' shape in the installation range of one first radiating element module 10. Is installed.

In addition, an additional second radiating element module 21 may be installed in a space between the first radiating element modules 20 installed at two places to maintain a constant disposition of the second radiating element modules 20. .

As such, setting the mutually arranged structure between the first radiating element module 10 and the second radiating element module 20 may include forming the second radiating element at the center position of the 'X' shape of the first radiating element module 10. Compared to the case in which the module 20 is installed, since the factors that adversely affect the CPR characteristics are further reduced, the CPR characteristics are further improved.

13 is a plan view of a dual band dual polarization antenna array according to an eighth embodiment of the present invention. Referring to FIG. 13, it can be seen that the antenna array according to the eighth embodiment of the present invention is mostly similar to the structure of the fifth embodiment shown in FIG. 10. However, as in the seventh exemplary embodiment illustrated in FIG. 12, the second radiating element module 20 is not installed at the center position of the 'X' shape of the first radiating element module 10, and the first radiating element module 20 is not installed. The second radiating element module 20 (20-1, 20-1, 20-2 in FIG. 12) is installed one by one in the upper and lower portions outside the central position of the 'X' shape in the installation range of the one radiating element module 10.

In addition, in the eighth embodiment shown in FIG. 13, as in the seventh embodiment shown in FIG. 12, the second radiating element module 20 is disposed in a space between the first radiating element modules 20 installed at two locations. An additional second radiating element module 21 is installed to keep the arrangement interval of the cells constant.

FIG. 14 is a graph showing beam characteristics in the first embodiment of the present invention, and FIG. 15 is a graph showing beam characteristics in the fifth embodiment shown in FIG. 14 and 15, in the fifth embodiment, the CPR characteristic is 16.3 dB to 21.4 dB at 0 degrees, 8.1 dB to 11.8 dB at +60 degrees, and -60 degrees in comparison with the first embodiment. It can be seen that the overall improvement from 5.7dB to 10.6dB.

FIG. 16 is a graph showing beam characteristics in the seventh embodiment of the present invention shown in FIG. 12. In the seventh embodiment, the CPR characteristic is 21.4 dB at 0 degrees even when compared to the fifth embodiment. It can be seen that the overall improvement is 25.3dB, from 11.8dB to 13.6dB at +60 degrees, and from 10.6dB to 14.3dB at -60 degrees.

As described above, a dual band dual polarization antenna according to an exemplary embodiment of the present invention may be configured. Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Can be. For example, in the above description, modifications of the first and second embodiments are shown in FIGS. 10 and 11, respectively, but the same modifications may also be applied to the third and fourth embodiments shown in FIGS. 8 and 9. have. That is, in the first radiating element module illustrated in FIGS. 8 and 9, the balun may be installed at left and right portions of the entire first radiating element module such that the balun is installed as far as possible from the installation position of the second radiating element module. As such, there may be various modifications and changes of the present invention, and therefore the scope of the present invention should be determined by the equivalents of the claims and the claims, rather than by the embodiments described.

1 is an exemplary perspective view of a conventional dual band dual polarization antenna array

2 is a perspective view of a dual band dual polarization antenna array according to a first embodiment of the present invention;

3 is a structural diagram of a dipole constituting a first radiating device module of FIG.

4 is a plan view of FIG.

5 is a perspective view of a dual band dual polarization antenna array according to a second embodiment of the present invention.

6 is a structural diagram of a dipole constituting the first radiating element module of FIG.

7 is a plan view of FIG.

8 is a plan view of a dual band dual polarization antenna array according to a third embodiment of the present invention.

9 is a plan view of a dual band dual polarization antenna array according to a fourth embodiment of the present invention.

10 is a plan view of a dual band dual polarization antenna array according to a fifth embodiment of the present invention.

11 is a plan view of a dual band dual polarization antenna array according to a sixth embodiment of the present invention.

12 is a plan view of a dual band dual polarization antenna array according to a seventh embodiment of the present invention.

13 is a plan view of a dual band dual polarization antenna array according to an eighth embodiment of the present invention.

14 is a graph showing beam characteristics in the first embodiment of the present invention.

15 is a graph showing beam characteristics in the fifth embodiment of the present invention.

16 is a graph showing beam characteristics in the seventh embodiment of the present invention.

Claims (15)

In the dual band dual polarization antenna for mobile communication base station, With reflector, At least one first radiating element module formed on the reflecting plate and composed of a plurality of dipoles which are generally installed in an 'X' shape to transmit and receive two linear quadrature polarizations for a first frequency band; At least one second radiating element module for at least one second frequency band installed together with the at least one first radiating element module on the reflecting plate, The conductive baluns of the first to fourth dipoles of the first radiating element module have a lower end portion of each balun compared to the upper end of the second radiating element module so that the installation range thereof is as far as possible from the installation range of the second radiating element module. Dual band dual polarization antenna, characterized in that it is configured further away from. The method of claim 1, wherein the first radiating device module is composed of first, second, third and fourth dipoles forming one end of each of the 'X' structure, The first and third dipoles are installed to have a slope of +45 degrees, and each of the first and third dipoles induces an electric field of +45 degrees that directly forms a +45 degree polarization of the entire polarization of the antenna, The second and fourth dipoles are installed to have a slope of -45 degrees, and each of the second and fourth dipoles induces an electric field of -45 degrees which directly forms a -45 degree polarization of the total polarizations of the antenna according to the installed state. Band dual polarized antenna. The method according to claim 1 or 2, The first to fourth dipoles of the first radiating element module is a dual-band dual polarization antenna, characterized in that the folded dipole type. The method according to claim 1 or 2, And at least some of the first to fourth dipoles of the first radiating element module have a curved folded dipole shape having at least one of the outer ends of the corresponding dipole element having a bent portion. The dual band dual polarization antenna of claim 1 or 2, wherein the second radiating element module is installed at upper and lower portions away from the central position of the 'X' shape of the first radiating element module. . In the dual band dual polarization antenna for mobile communication base station, With reflector, At least one first radiating element module formed on the reflecting plate and composed of a plurality of dipoles which are generally installed in an 'X' shape to transmit and receive two linear quadrature polarizations for a first frequency band; At least one second radiating element module for at least one second frequency band installed together with the at least one first radiating element module on the reflecting plate, The second radiating device module is a dual-band dual polarization antenna, characterized in that installed in the upper, lower portion outside the central position of the 'X' shape of the first radiating device module. The method of claim 6, wherein the first radiating element module is composed of first, second, third and fourth dipoles forming each end of the 'X' structure, The first and third dipoles are installed to have a slope of +45 degrees, and each of the first and third dipoles induces an electric field of +45 degrees that directly forms a +45 degree polarization of the entire polarization of the antenna, The second and fourth dipoles are installed to have a slope of -45 degrees, and each of the second and fourth dipoles induces an electric field of -45 degrees which directly forms a -45 degree polarization of the entire polarization of the antenna according to the installed state. Dual band dual polarized antenna. The method according to claim 6 or 7, The first to fourth dipoles of the first radiating element module is a dual-band dual polarization antenna, characterized in that the folded dipole type. The method according to claim 6 or 7, And at least some of the first to fourth dipoles of the first radiating element module have a curved folded dipole shape having at least one of the outer ends of the corresponding dipole element having a bent portion. In the dual band dual polarization antenna for mobile communication base station, With reflector, At least one or more dipoles formed on the reflector and composed of a plurality of dipoles which are generally installed in a '>>' or '<<' shape to transmit and receive two linear quadrature polarizations for a first frequency band. A first radiating element module, At least one second radiating element module for at least one second frequency band installed together with the at least one first radiating element module on the reflecting plate, The conductive baluns of the first to fourth dipoles of the first radiating element module have a lower end portion of each balun compared to the upper end of the second radiating element module so that the installation range thereof is as far as possible from the installation range of the second radiating element module. Dual band dual polarization antenna, characterized in that it is configured further away from. 11. The method of claim 10, wherein the first radiating element module is composed of first, second, third and fourth dipoles forming each end of the '>>' or '<<' character structure, The first and third dipoles are installed side by side with a slope of +45 degrees, and induces an electric field of +45 degrees which directly forms a +45 degree polarization of the total polarizations of the antenna according to the installed state, respectively. The second and fourth dipoles are installed side by side with a slope of -45 degrees, and each of the second and fourth dipoles induces an electric field of -45 degrees which directly forms a -45 degrees polarization of the total polarizations of the antenna according to the installed state. Dual band dual polarized antenna. The method according to claim 10 or 11, wherein The first to fourth dipoles of the first radiating element module is a dual-band dual polarization antenna, characterized in that the folded dipole type. The method according to claim 10 or 11, wherein And at least some of the first to fourth dipoles of the first radiating element module have a curved folded dipole shape having at least one of the outer ends of the corresponding dipole element having a bent portion. In the dual band dual polarization antenna for mobile communication base station, With reflector, At least one first radiating element module formed on the reflector and composed of a plurality of dipoles for transmitting and receiving two linear quadrature polarizations for a first frequency band; At least one second radiating element module for at least one second frequency band installed together with the at least one first radiating element module on the reflecting plate, The conductive baluns of the first to fourth dipoles of the first radiating element module have a lower end portion of each balun compared to the upper end of the second radiating element module so that the installation range thereof is as far as possible from the installation range of the second radiating element module. Dual band dual polarization antenna, characterized in that it is configured further away from. 15. The dual band dual polarization antenna of claim 14, wherein the first radiating element module is composed of a plurality of dipoles which are generally installed in an 'X' shape or a rhombus shape.

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