JP6695632B2 - Yagi type antenna for dual polarization - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a Yagi-type antenna for dual polarization, which has high sensitivity and good cross polarization discrimination.

  The Yagi antenna is conventionally known as a directional antenna used in the very high frequency (VHF) band or higher. The Yagi antenna is either vertically polarized or horizontally polarized depending on the line specifications of the communication system and the communication specifications of the infrastructure. The device is installed vertically or horizontally with respect to the ground so as to correspond to In this case, the mode in which the elements are arranged vertically with respect to the ground corresponds to the vertically polarized wave, and the mode in which the elements are arranged in parallel with the ground corresponds to the horizontally polarized wave. Also, in the communication system and broadcasting business fields, it is necessary to perform communication formats that use separate frequency bands for vertical polarization and horizontal polarization, and spatial multiplexing communication that uses both vertical polarization and horizontal polarization. Is proposed. In this case, a Yagi type antenna for dual polarization which can support vertical polarization and horizontal polarization with one antenna device is used.

FIG. 23 is a perspective view showing an example of the configuration of a conventional Yagi type antenna for dual polarization.
A conventional Yagi-type dual-polarization antenna 101 shown in this figure includes a metal arm 118 having a linear cross section and a plurality of linear horizontal polarization-side waveguide elements 111 arranged in a horizontal plane. A linear horizontal polarization side radiating element 110 and a linear horizontal polarization side reflecting element 112, a plurality of linear vertical polarization side waveguide elements 115 arranged in a vertical plane, and a linear shape The vertical polarization side radiating element 114 and the linear vertical polarization side reflecting element 116 are included. The arm 118 is divided into a front first arm 118a and a rear second arm 118b, and a shield cylinder 119 is arranged between them. A plurality of horizontal polarization side waveguide elements 111 and vertical polarization side waveguide elements 115 are arranged substantially orthogonal to the first arm 118a in order from the front side of the first arm 118a. Next, the horizontal polarization side radiating element 110 and the vertical polarization side radiating element 114 are arranged substantially orthogonal to the shield cylinder 119 arranged in the middle of the arm 118. The horizontal polarization side radiating element 110 and the vertical polarization side radiating element 114 are dipole elements. On the subsequent rear side, a horizontal polarization side reflection element 112 and a vertical polarization side reflection element 116 are arranged substantially orthogonal to the second arm 118b. In this case, the horizontal polarization side waveguide element 111, the horizontal polarization side radiating element 110, and the horizontal polarization side reflecting element 112 are arranged substantially parallel to each other in a horizontal plane to form a Yagi antenna for horizontal polarization. is doing. Further, the vertically polarized wave side waveguide element 115 and the vertically polarized wave side radiating element 114 and the vertically polarized wave side reflecting element 116 are arranged substantially parallel to each other in a vertical plane to form a Yagi antenna for vertically polarized wave. is doing.

JP, 2011-239198, A

  For areas where incoming radio waves are weak, polarization-combined Yagi-type antennas with higher reception sensitivity are needed. However, since the conventional Yagi-type antenna for dual polarization has a configuration in which an ordinary Yagi-type antenna is combined, there is a limit in improving the reception sensitivity (antenna gain) of the main polarization.

  Therefore, an object of the present invention is to provide a Yagi-type antenna for dual-polarization, which has higher sensitivity and good cross polarization discrimination.

A Yagi-type antenna for dual polarization of the present invention includes: a first polarization waveguide section including a first polarization waveguide element; a first polarization radiation section including a first polarization radiation element; A first Yagi antenna for the first polarization including a first polarization reflection section including a one-polarization reflection element, and a second polarization waveguide section including a second polarization waveguide element, A second polarized wave that is orthogonal to the first polarized wave that includes a second polarized wave radiation section that includes the second polarized wave radiation element and a second polarized wave reflection section that includes the second polarized wave reflection element. A second Yagi antenna; and an arm to which the first Yagi antenna and the second Yagi antenna are attached, wherein the first polarized-wave reflection unit includes a plurality of the first polarized-wave reflection elements. A second polarization second reflection element having a fixed insulating rod-shaped first polarization reflection bracket fixed to the surface in the long axis direction of the first polarization reflection bracket. An insulating rod-shaped second polarization reflection bracket to which a reflection element for two polarizations is fixed, and a plurality of reflection elements for the second polarization are fixed to the reflection section for the second polarization. Most preferably, the second reflection element for the first polarization functioning as the reflection element for the first polarization is fixed to the surface in the long axis direction of the reflection bracket for the second polarization. It has a feature.
Further , another Yagi antenna for dual polarization of the present invention is a first polarized wave radiation portion including a first polarized wave waveguide portion including a first polarized wave waveguide element and a first polarized wave radiation element. And a first Yagi antenna for first polarization, which includes a first polarization reflection element, and a second polarization waveguide including a second polarization waveguide element. A second polarization orthogonal to a first polarization including a wave portion, a second polarization radiation section including a second polarization radiation element, and a second polarization reflection section including a second polarization reflection element A second Yagi antenna for polarization; and an arm to which the first Yagi antenna and the second Yagi antenna are attached, wherein the first polarization waveguide element passes through substantially the center of the arm. They are arranged in two stages in line symmetry with respect to the one-line symmetry axis and fixed to the arm, and the second polarization waveguide element is substantially orthogonal to the first line-symmetry axis, and The first polarization-reflecting portion is arranged in two stages in line symmetry with respect to a second line-symmetry axis that passes through substantially the center and is fixed to the arm. An insulating rod-shaped first polarization reflection bracket to which the element is fixed, and a second polarization reflection element that functions on the surface of the first polarization reflection bracket in the major axis direction. Second reflective element for the second polarized wave is fixed, and the reflective portion for the second polarized wave is an insulating rod-shaped second polarized wave to which a plurality of the reflective elements for the second polarized wave are fixed. It is most preferable to have a reflection bracket, and the second reflection element for the first polarization functioning as the reflection element for the first polarization is fixed to the surface of the reflection bracket for the second polarization in the major axis direction. It has a major feature.

  According to the present invention, the second reflection element for second polarization is fixed to the reflection bracket for first polarization, and the second reflection element for first polarization is fixed to the reflection bracket for second polarization. As a result, a Yagi-type antenna for dual-polarization can be obtained in which a reflection element for the first polarization and a reflection element for the second polarization are added to obtain higher sensitivity and good cross polarization discrimination. be able to. Further, by arranging the waveguide element for the first polarization and the waveguide element for the second polarization in two stages, high sensitivity and good polarization cross polarization discrimination can be obtained. It can be a Yagi type antenna.

It is a side view which shows the structure of the polarization Yagi type | mold antenna concerning the Example of this invention. It is a top view which shows the structure of the polarization Yagi type | mold antenna concerning the Example of this invention. It is a rear view which shows the structure of the Yagi type | mold antenna for dual polarizations concerning the Example of this invention. It is a side view which shows the dimension of the polarization Yagi type | mold antenna concerning the Example of this invention. It is a top view which shows the dimension of the polarization Yagi type | mold antenna concerning the Example of this invention. It is a front view which shows the structure of the waveguide part for horizontal polarizations, and the waveguide part for vertical polarizations in the Yagi-type antenna for dual polarization of this invention. It is a perspective view showing the composition of the radiation part for horizontal polarization in the polarization Yagi type antenna concerning the example of the present invention. It is a front view which shows the structure of the radiation | emission part for horizontally polarized waves in the Yagi type antenna for dual polarizations concerning the Example of this invention. It is a perspective view showing the composition of the radiation part for horizontal polarization and the radiation part for vertical polarization in the Yagi type antenna for dual polarized waves concerning the example of the present invention. It is a front view which shows the structure of the reflection part for horizontal polarizations, and the reflection part for vertical polarizations in the Yagi type | mold antenna for polarized waves of this invention. It is a side view which shows the structure of the reflection part for horizontal polarizations, and the reflection part for vertical polarizations in the Yagi type antenna for dual polarizations concerning the Example of this invention. FIG. 6 is a perspective view showing an aspect of assembling a horizontally polarized reflection portion in the Yagi-type antenna for dual polarization according to the example of the present invention. It is a front view, a side view, a rear view, and a bottom view showing composition of the 1st reflective bracket concerning an example of the present invention. It is a front view, a side view, and a bottom view showing a configuration of a horizontal polarization reflection part of a Yagi-type antenna for dual polarization according to an embodiment of the present invention. It is a partially expanded perspective view which shows the aspect of an assembly of the 1st reflective bracket and 2nd reflective bracket concerning the Example of this invention. It is a side view which shows the aspect of an assembly of the reflection part for horizontal polarizations, and the reflection part for vertical polarizations concerning the Example of this invention. It is a partially expanded perspective view which shows the aspect of an assembly of the reflection part for horizontal polarizations, and the reflection part for vertical polarizations concerning the Example of this invention. FIG. 4 is a partially enlarged front view showing an assembled mode of the horizontally polarized wave reflection portion and the vertically polarized wave reflection portion according to the embodiment of the present invention. It is a figure which shows the electric characteristic by the side of horizontal polarization in the case where the 2nd reflective element is not provided in the reflective bracket in the polarization Yagi antenna of the Example of this invention. It is a figure which shows the electric characteristic by the side of horizontal polarization in the case where the 2nd reflection element is provided in a reflection bracket in the polarization Yagi antenna of the Example of this invention. It is a figure which shows the electric characteristic of the vertical polarization side in case the Yagi type antenna for dual polarized waves of the Example of this invention is equipped with the 2nd reflective element in a reflective bracket. It is a figure which shows the electric characteristic of the vertical polarization side at the time of equipping the polarization common Yagi type antenna of the Example of this invention with a 2nd reflective element in a reflective bracket. It is a perspective view which shows the structure of the conventional Yagi type antenna for dual polarization.

FIG. 1 is a side view showing the configuration of a Yagi type antenna for dual polarization according to an embodiment of the present invention, FIG. 2 is a top view showing the configuration, and FIG. 3 is a rear view showing the configuration.
The Yagi type antenna for dual polarization 1 according to the embodiment of the present invention shown in these figures has an applicable frequency of 578 MHz to 674 MHz for horizontal polarization and vertical polarization, and is an antenna applicable to terrestrial digital broadcasting. Has been done. A polarization Yagi antenna 1 according to the present invention includes a metal arm 2 having a pipe-like circular cross section, and comprises a Yagi antenna for horizontal polarization and a Yagi antenna for vertical polarization fixed to the arm 2. It is configured. The Yagi antenna for horizontally polarized waves includes a horizontally polarized wave guiding portion 11 including a plurality of rows (for example, 12 rows) of horizontally polarized wave guiding elements 11a stacked in two stages and fixed to the arm 2. There is. In this case, the horizontally polarized wave guiding element 11a is stacked in two stages in line symmetry with respect to a horizontal line symmetry axis that passes through substantially the center of the arm 2. In the horizontally polarized Yagi antenna, the horizontally polarized radiation section 10 including the horizontally polarized radiation element 10a is arranged adjacent to the rear of the horizontally polarized wave guiding section 11, and the horizontally polarized radiation is generated. A horizontally polarized wave reflection portion 12 is disposed adjacent to the rear of the portion 10. The horizontally polarized wave reflection portion 12 is configured by stacking horizontally polarized wave reflection elements 12a in a plurality of stages. The horizontally polarized wave reflection element 12a has a horizontal line symmetry axis that passes through substantially the center of the arm 2. The lines are stacked symmetrically with respect to each other. As will be described later, the horizontal polarization reflection element 12a is attached to an insulating synthetic resin reflection bracket, and the reflection bracket is provided with a second vertical polarization reflection element 22b.

  In addition, the Yagi antenna for vertically polarized waves includes a vertically polarized wave guiding portion 21 composed of a plurality of rows (for example, 12 rows) of vertically polarized wave guiding elements 21 a that are stacked in two stages and fixed to the arm 2. I have it. In this case, the vertically polarized wave guiding element 21a is stacked in two stages substantially orthogonal to the horizontally polarized wave guiding element 11a and in line symmetry with respect to a line symmetry axis in the vertical direction passing through substantially the center of the arm 2. ing. In the Yagi antenna for vertically polarized waves, the vertically polarized radiation section 20 including the vertically polarized radiation element 20a is arranged adjacent to the rear side of the vertically polarized wave guiding section 21. A vertically polarized reflection portion 22 is arranged adjacent to the rear of the portion 20. The vertically polarized wave reflection portion 22 is configured by stacking vertically polarized wave reflection elements 22a in a plurality of stages. The vertically polarized wave reflection element 22a has a line symmetry axis in the vertical direction that passes through substantially the center of the arm 2. The lines are stacked symmetrically with respect to each other. As will be described later, the vertical polarization reflection element 22a is also attached to an insulating synthetic resin reflection bracket, and the second horizontal polarization reflection element 12b is provided on the reflection bracket.

Horizontal polarization waveguide element 11a, horizontal polarization radiating element 10a, horizontal polarization reflecting element 12a and second horizontal polarization reflecting element 12b, vertical polarization waveguide element 21a, vertical polarization radiation The element 20a, the vertical polarization reflection element 22a, and the second vertical polarization reflection element 22b are linear elements, and the outer diameters of these elements are the same. It is configured.
In the Yagi antenna 1 for dual polarization according to the present invention, the rear end of the arm 2 is attached to the vertically mounted metal pole 3 by the mounting bracket 5a, and the middle of the arm 2 and the middle of the pole 3 are connected. A stay 4 arranged obliquely between them is attached. One end of the stay 4 is fixed to the middle of the pole 3 by a mounting member 5b, and the other end is tiltably fixed to the middle of the pole 3. In the Yagi-type antenna for dual polarization 1 according to the present invention, when the arm 2 is attached to the pole 3, the arm 2 is located in the horizontal plane, and the waveguide element 11a for horizontal polarization, the radiating element 10a for horizontal polarization, and the horizontal polarization element are provided. The Yagi antenna for horizontal polarization composed of the reflection element 12a for waves is located in the horizontal plane, and the vertical polarization composed of the waveguide element 21a for vertical polarization, the radiation element 20a for vertical polarization and the reflection element 22a for vertical polarization. The Yagi antenna is located in the vertical plane.

  The Yagi-type antenna for dual-polarization 1 according to the present invention has the same applied frequency band for horizontal polarization and vertical polarization, and if the wavelength of the frequency band of the Yagi-type antenna for dual-polarization 1 is λ, the dipole element The horizontal polarization radiating element 10a and the vertical polarization radiating element 20a are set to have a length of about λ / 2, and a plurality of horizontal polarization waveguide elements 11a and vertical polarization waveguide elements 21a are provided. Is slightly shorter than approximately λ / 2, and the horizontal polarization reflection element 12a, the second horizontal polarization reflection element 12b, the vertical polarization reflection element 22a, and the second vertical polarization reflection element 22a. The length of the element 22b is slightly longer than about λ / 2. Further, a plurality of horizontal polarization waveguide elements 11a and vertical polarization waveguide elements 21a, horizontal polarization radiating element 10a and vertical polarization radiating element 20a, horizontal polarization reflecting element 12a and vertical polarization. The distance between the respective elements in the reflective element 22a is based on the distance of about λ / 4. As a result, the horizontal polarization waveguide element 11a and the vertical polarization waveguide element 21a become capacitive, and the horizontal polarization reflection element 12a, the second horizontal polarization reflection element 12b, and the vertical polarization reflection element 12a. The element 22a and the second vertical polarization reflection element 22b become inductive, so that the horizontal polarization reflection element 12a and the vertical polarization reflection element 22a are guided to the horizontal polarization waveguide element 11a and the vertical polarization reflection element 22a. The directional characteristic is obtained in which horizontal and vertical polarized sharp radiation beams having a small half-value angle are provided in the direction toward the wave element 21a.

Next, the dimensions of the Yagi type antenna 1 for dual polarization according to the present invention are shown in FIGS. As shown in the side view of FIG. 4, the length of the arm 2 in the Yagi-type antenna 1 for dual polarization is L1, and the length from the vertical polarization reflection part 22 to the vertical polarization waveguide part 21 is L2. The length from the polarization reflection portion 22 to the center of the pole 3 is L3, the length of the horizontal polarization reflection portion 12 is H1, and the mounting bracket 5b for attaching the stay 4 to the pole 3 from the center of the arm 2 is provided. The height to the center of is H2. Further, as shown in FIG. 5, the length of the vertically polarized reflection portion 22 is W.
Here, as an example of the dimensions when the applied frequency band of the horizontal polarization and the vertical polarization in the Yagi antenna 1 for dual polarization according to the present invention is set to 578 MHz to 674 MHz, the length L1 is about 1365 mm, The length L2 is about 1137 mm, the length L3 is about 161 mm, the length H1 is about 594 mm, the height H2 is about 702 mm, and the length W is about 594 mm, which is the same as the length H1.

Next, the configurations of the horizontally polarized wave waveguide 11 and the vertically polarized wave waveguide 21 will be described. The horizontally polarized wave guiding portion 11 is composed of a plurality of rows in which the horizontally polarized wave guiding elements 11a are stacked in two stages, and the vertically polarized wave guiding portion 21 has two vertically polarized wave guiding elements 21a. It is composed of a plurality of columns stacked in a row, and FIG. 6 shows the configuration of one column.
As shown in FIG. 6, the horizontally polarized wave guiding element 11a forming a linear element stacked in two stages is cut in half, and its end is fixed to the waveguide bracket 30. The vertically polarized waveguiding element 21a that constitutes the linear element stacked on top of each other is also half-divided, and its end is fixed to the waveguide bracket 30. The waveguide bracket 30 is composed of a main body 30a made of an insulating synthetic resin, and eight holding portions 30b are radially arranged around the main body 30a from left and right to four in the horizontal direction and four in the vertical direction from the upper and lower sides. It is formed so as to project, and the end portions of the horizontal polarization waveguide element 11a and the vertical polarization waveguide element 21a are fixed to the respective holding portions 30b. In this case, a rectangular hole is formed in the holding portion 30b, and a tool is inserted into this hole to crush the end of the horizontal polarization waveguide element 11a (vertical polarization waveguide element 21a). Thus, the horizontally polarized wave guiding element 11a (vertically polarized wave guiding element 21a) is fixed to the holding portion 30b of the waveguide bracket 30. An insertion hole 30c for inserting the arm 2 is formed in the center of the main body 30a. When the arm 2 is inserted through the insertion hole 30c, the horizontally polarized wave guiding element 11a is arranged in two stages in line symmetry with respect to the first line symmetry axis located on the horizontal plane passing substantially through the center of the arm 2. The polarization waveguide element 21a is arranged in two stages in line symmetry with respect to the second line symmetry axis located on the vertical plane that passes through substantially the center of the arm 2. Then, the waveguide brackets 30 to which the ends of the horizontally polarized wave guide element 11a and the vertically polarized wave guide element 21a are fixed are prepared by the required number of rows, and the plurality of waveguide brackets 30 are provided on the arm 2. Are inserted and fixed at predetermined positions, thereby forming the horizontally polarized wave guiding portion 11 and the vertically polarized wave guiding portion 21. In this case, the stacked horizontal polarization waveguide element 11a and vertical polarization waveguide element 21a are arranged in the same vertical plane.

Next, the configurations of the horizontally polarized radiation section 10 and the vertically polarized radiation section 20 will be described. However, since they have the same configuration, only the configuration of the horizontally polarized radiation section 10 will be described.
FIG. 7 is a perspective view showing the configuration of the horizontally polarized radiation section 10 in the Yagi-type antenna 1 for dual polarization of the present invention, and FIG. 8 is a front view showing the configuration.
The horizontal polarization radiating section 10 shown in these figures includes a horizontal polarization feed section 13 made of synthetic resin, which has a substantially rectangular parallelepiped shape, and a dipole element extending from the horizontal polarization feed section 13 to both sides. It is composed of the half-divided radiating elements for horizontal polarization 10a and 10b. The horizontally polarized power feeding portion 13 has a box-shaped main body portion 13a whose inside is a storage space for storing the balanced-to-unbalanced converter, and a first fitting formed to project from the lower portion of the main body portion 13a to the front side. It is composed of a joining portion 13b and a second fitting portion 13c. A coaxial connector 15 is provided on the front surface of the main body 13a. One end of the half-divided horizontal polarization radiating element 10a is inserted into the insertion hole of the first fitting portion 13b, and the other half of the horizontal polarization is half-cut into the insertion hole of the second fitting portion 13c. The end portion of the radiating element 10b for insertion is inserted, and a screw is inserted and screwed into the insertion hole 13h formed in the first fitting portion 13b and the second fitting portion 13c. Thereby, the radiating elements 10a and 10b for horizontal polarization are fixed to the main body 13a, and the radiating elements 10a and 10b for horizontal polarization are connected to the balanced / unbalanced converter housed in the main body 13a. And is connected to the coaxial connector 15 via the balanced / unbalanced converter.

Further, a cutout is formed between the first fitting portion 13b and the second fitting portion 13c in the body portion 13a, and a semicircular groove portion 13g is formed on the lower surface of the body portion 13a. The inner diameter of the semicircular groove portion 13g is substantially the same as the outer diameter of the arm 2, and a screw hole (not shown) is formed at the top of the semicircular groove portion 13g.
The configuration of the vertically polarized radiation unit 20 is the same as that of the horizontally polarized radiation unit 10 described above, and in the following description, the reference numeral of each component of the horizontally polarized radiation unit 10 is the number 10. The added sign represents the sign of each part of the vertically polarized radiation unit 20.

FIG. 9 is a perspective view showing a configuration in which the horizontally polarized radiation section 10 and the vertically polarized radiation section 20 are fixed to the arm 2.
When fixing as shown in this figure, screw holes formed in the semi-circular groove portion 13g of the horizontally polarized power feeding portion 13 are provided with fitting holes and mounting holes (not shown) provided on the outer peripheral surface of the arm 2. The horizontally polarized power feeding portion 13 is arranged on the arm 2 in a horizontal plane so as to face the screw. Next, the mounting screw is screwed into the screw hole. As a result, the horizontally polarized power feeding portion 13 is fixed to the arm 2, and the horizontally polarized radiation elements 10a and 10b are arranged in the horizontal plane. Further, the screw hole formed in the semicircular groove portion of the vertically polarized power feeding portion 23 is made to face the mounting screw 4b, and the vertically polarized power feeding portion 23 is arranged in the vertical plane with respect to the arm 2. .. In this case, the front surface of the horizontally polarized power feeding portion 13 and the front surface of the vertically polarized power feeding portion 23 face each other. Next, the mounting screw 4b is screwed into the screw hole. As a result, the vertically polarized power feeding portion 23 is fixed to the arm 2, and the vertically polarized radiation elements 20a and 20b are arranged in the vertical plane. In this case, since the horizontally polarized radiating elements 10a and 10b and the vertically polarized radiating elements 20a and 20b are formed so that the fitting portions project from the main body, they are arranged in the same vertical plane. Become.

Next, the configurations of the horizontal polarization reflection section 12 and the vertical polarization reflection section 22 will be described. The horizontally polarized wave reflection portion 12 is formed by stacking horizontally polarized wave reflection elements 12a in six stages, and the vertically polarized wave reflection portion 22 is formed by stacking vertically polarized wave reflection elements 22a in six stages. FIG. 10 is a front view showing the configurations of the horizontal polarization reflection section 12 and the vertical polarization reflection section 22, and FIG. 11 is a side view showing the configurations.
As shown in these figures, the horizontal polarization reflection part 12 is a first reflection bracket 40 made of a synthetic resin and having a rectangular cross section to which the horizontal polarization reflection elements 12a stacked in three stages are attached. And a second reflection bracket 50 made of synthetic resin and having a rectangular cross section, to which the horizontally polarized reflection elements 12a stacked in three stages are attached. In this case, the end of the first reflective bracket 40 and the end of the second reflective bracket 50 are joined together to form a single rod. The horizontal polarization reflection part 12 including one rod-shaped reflection bracket has a circular insertion hole through which the arm 2 is inserted in the central part, and the horizontal polarization reflection part 12 is stacked in six stages. The element 12a is provided. Further, the second reflective element 22b for vertical polarization is attached to the back surfaces of the first reflective bracket 40 and the second reflective bracket 50, respectively.

The configuration of the vertically polarized reflection portion 22 is similar to that of the horizontally polarized reflection portion 12, and the end portion of the third reflection bracket 60 made of a synthetic resin and having a rectangular cross section, and the cross section Is connected to the end of the fourth reflection bracket 70, which has a rectangular shape, to form a single rod. The vertical polarization reflection part 22 provided with one rod-shaped reflection bracket has a circular insertion hole through which the arm 2 is inserted in the central part, and the vertical polarization reflection part is stacked in six stages. The element 22a is provided. Further, the second reflection element 12b for horizontal polarization is attached to the back surfaces of the third reflection bracket 60 and the fourth reflection bracket 70, respectively.
One rod-shaped first reflection bracket 40 and second reflection bracket 50 that form the horizontally polarized wave reflection portion 12, and one rod-shaped third reflection that forms the vertically polarized wave reflection portion 22. The bracket 60 and the fourth reflective bracket 70 are arranged orthogonally to each other as described later, and are attached to the arm 2 integrally by connecting the central portions. As a result, the horizontal polarization reflection element 12a and the second horizontal polarization reflection element 12b are arranged in the horizontal plane, and the vertical polarization reflection element 22a and the second vertical polarization reflection element 22a are arranged. The element 22b comes to be arranged in the vertical plane.

Here, with reference to the perspective view shown in FIG. 12, the assembly of the horizontally polarized reflection portion 12 in the Yagi type antenna for dual polarization 1 according to the embodiment of the present invention will be described.
As shown in FIG. 12, the horizontal polarization reflection elements 12 a stacked in three stages are attached to the first reflection bracket 40 that constitutes the horizontal polarization reflection section 12, and the second reflection bracket 50 includes the second reflection bracket 50. Horizontally polarized reflection elements 12a stacked in three stages are attached. Then, as will be described later in detail, the first claw portion 42 and the second claw portion 43 formed on the lower end portion of the first reflective bracket 40, and the first claw portion 52 formed on the lower end portion of the second reflective bracket 50. By mating the second claw portion 53 and the second claw portion 53 so as to face each other, the first reflection bracket 40 and the second reflection bracket 50 are formed into a single rod shape whose major axes match each other. As a result, the horizontally polarized wave reflection portion 12 is configured. A second vertical polarization reflection element 22b is attached to the back surface of the first reflection bracket 40 in the longitudinal direction, and a second vertical polarization reflection element 22b is also attached to the back surface of the second reflection bracket 50 in the longitudinal direction. The element 22b is attached.

Here, a front view showing the structure of the first reflection bracket 40 is shown in FIG. 13A, a side view showing the structure is shown in FIG. 13B, and a rear view showing the structure is shown in FIG. 13C. FIG. 13 (d) is a bottom view showing the structure shown in FIG. Since the first reflecting bracket 40, the second reflecting bracket 50, the third reflecting bracket 60, and the fourth reflecting bracket 70 have the same configuration, only the first reflecting bracket 40 will be described, and the second reflecting bracket 50 will be described. The description of the fourth reflective bracket 70 is omitted. In addition, in the following description, reference numerals obtained by adding the numbers of 10, 20, and 30 to the reference numerals of the respective portions of the first reflection bracket 40 will be used to indicate the respective portions of the second reflection bracket 50, the third reflection bracket 60, and the fourth reflection bracket 70. Represents the sign of.
As shown in these drawings, the first reflection bracket 40 has a rectangular rod shape whose cross section is horizontally long, and has a circular insertion shape through which the horizontal polarization reflection element 12a is inserted at the upper, central, and lower portions of the side surface, respectively. A hole 47 is formed so as to penetrate both side surfaces, and a cylindrical holding portion 41 through which the second vertical polarization reflection element 22b is inserted is formed in the upper portion, the central portion, and the lower portion of the back surface. Further, a semicircular holding portion 45 is formed in the lower portion of the first reflection bracket 40, and a flat plate-shaped first claw portion 42 extending downward from the side surface is formed on the left side of the holding portion 45, A long groove 43a is formed on the right side of the holding portion 45, and a flat plate-shaped second claw portion 43 that is shorter than the first claw portion 42 extending downward from the side surface is formed on the outer side of the long groove 43a. A screw hole 48 into which a screw is inserted is formed in a substantially central portion of a side wall of the semicircular holding portion 45, and a nut fitting communicating with the screw hole 48 is provided in the vicinity of the holding portion 45 of the first reflecting bracket 40. An insertion hole 49 is formed. An elongated rectangular frame-shaped protrusion 42a having a long hole 42b is formed on the upper portion of the outer surface of the first claw portion 42, and the second claw portion 43 extends from the rear surface to the front surface in the vicinity of the base. A fitting groove 43b is formed. In addition, a flat plate-like plate-like projection 46 protruding rearward is formed between the first claw portion 42 and the lower holding portion 41 at a lower portion of the back surface of the first reflecting bracket 40 so as to be substantially orthogonal to the elongated hole 42b. ing.

As described above, the three reflection elements for horizontal polarization 12a and the second reflection element for vertical polarization 22b stacked in three stages are attached to the first reflection bracket 40. 14 is shown. FIG. 14A is a front view showing the mounted state, FIG. 14B is a side view showing the mounted state, and FIG. 14C is a bottom view showing the mounted state.
As shown in these drawings, in the first reflection bracket 40 shown in FIG. 13, the horizontal polarization reflection elements 12a are inserted into the three insertion holes 47, respectively. A rectangular hole that communicates with the insertion hole 47 is formed in the front surface of the first reflection bracket 40, and a tool is inserted into this hole to crush the central portion of the horizontal polarization reflection element 12a, thereby making it horizontal. The polarized wave reflection element 12a is fixed to the insertion hole 47 of the first reflection bracket 40. In addition, the second vertical polarization reflection element 22b is inserted into the four holding portions 41 formed on the back surface of the first reflection bracket 40, and a rectangular shape is formed between the two holding portions 41 in the central portion. The second vertically polarized wave reflective element 22b is fixed to the back surface of the first reflective bracket 40 by inserting a tool into the caulking hole 44 and crushing the central portion of the vertically polarized wave reflective element 22b. The first reflection bracket 40 is made of synthetic resin in order to reduce the weight, and does not reach the strength of the case of being made of metal, but the first reflection bracket 40 is provided by the second vertical polarization reflection element 22b. The strength of can be improved.

Three reflection elements for horizontal polarization 12a and a second reflection element for vertical polarization 22b, which are stacked in three stages, are attached to the second reflection bracket 50. The attachment state is the first reflection bracket 40 described above. The first reflection bracket 40 shown in FIG. 14 is rotated by 180 °. Further, the second reflection bracket 50 is made of synthetic resin in order to reduce the weight, and does not reach the strength when made of metal, but the second vertical polarization reflection element 22b is fixed to the back surface. As a result, the strength of the second reflective bracket 50 can be improved.
The configurations of the third reflection bracket 60 and the fourth reflection bracket 70 that form the vertically polarized reflection portion 22 are the same as the configurations of the first reflection bracket 40 shown in FIG. 13. Further, three vertically polarized reflection elements 22a and a second horizontally polarized reflection element 12b are stacked in three stages on the third reflection bracket 60 and the fourth reflection bracket 70 in the vertical polarization reflection portion 22. Are mounted, but the mounting state is different in that the horizontal polarization reflection element 12a and the second vertical polarization reflection element 22b become the vertical polarization reflection element 22a and the second horizontal polarization reflection element 12b. However, it is similar to the first reflection bracket 40, and has the same configuration as the configuration in which the first reflection bracket 40 shown in FIG. 14 is rotated 90 ° to the right or 90 ° to the left.

  Next, the first claw portion 42 and the second claw portion 43 formed at the lower end portion of the first reflection bracket 40, and the first claw portion 52 and the second claw portion formed at the lower end portion of the second reflection bracket 50. FIG. 15 is a partially enlarged view of a mode of assembling with 53 opposed to each other. As shown in FIG. 15, with the back surfaces of the first reflective bracket 40 and the second reflective bracket 50 facing upward, from the diagonally lower sides of the first claw portion 42 and the second claw portion 43 at the end of the first reflective bracket 40, The first claw portion 52 and the second claw portion 53 at the end of the second reflection bracket 50 are brought closer to each other, and the second reflection is formed in the elongated hole 42b of the protrusion 42a of the first claw portion 42 of the first reflection bracket 40. While inserting the 2nd nail | claw part 53 of the bracket 50, the front-end | tip part of the 1st nail | claw part 52 of the 2nd reflective bracket 50 is inserted in the long groove 43a of the 1st reflective bracket 40. At this time, the second claw portion 43 of the first reflecting bracket 40 is inserted into the long hole 52b of the projecting portion 52a of the first claw portion 52 of the second reflecting bracket 50, and the long groove of the second reflecting bracket 50 is inserted. The tip portion of the first claw portion 42 of the first reflection bracket 40 is inserted into the inside 53a. Then, when the second reflection bracket 50 is rotated so that the long axes of the first reflection bracket 40 and the second reflection bracket 50 coincide with each other, the first reflection bracket 40 is inserted into the fitting groove 53b of the second claw portion 53. The front side of the protruding portion 42a, which is a frame forming the elongated hole 42b, is fitted, and the protruding groove 42b of the second reflecting bracket 50 is formed in the fitting groove 43b of the second claw portion 43. As the front side of the portion 52a is fitted, the first reflecting bracket 40 and the second reflecting bracket 50 are fitted so that their major axes coincide with each other. In this case, the semicircular holding portion 45 of the first reflecting bracket 40 and the semicircular holding portion 55 of the second reflecting bracket 50 face each other, thereby forming an insertion hole through which the arm 2 can be inserted. It

In the aspect in which the vertical polarization reflection portion 22 is configured by assembling the third reflection bracket 60 and the fourth reflection bracket 70, the horizontal polarization reflection is obtained by assembling the first reflection bracket 40 and the second reflection bracket 70 described above. Since the configuration is similar to that of the portion 12, the description thereof will be omitted.
Next, FIG. 16 is a side view showing an aspect of assembling the horizontally polarized reflection portion 12 and the vertically polarized reflection portion 22, and FIG. 17 is a partially enlarged perspective view showing the assembling aspect. A partially enlarged front view shown in FIG. 18 is shown.
As shown in FIGS. 16 and 17, the back surface of the horizontal polarization reflection portion 12 and the back surface of the vertical polarization reflection portion 22 are opposed to each other and arranged orthogonal to each other. Are approached until the central portion of the vertically polarized reflection portion 22 comes into contact with. Then, the plate-like protrusion 46 of the first reflecting bracket 40 is fitted into the remaining hole portion in the elongated hole 62b into which the second claw portion 73 of the protruding portion 62a of the third reflecting bracket 60 is fitted. The plate-like protrusion 56 of the second reflecting bracket 50 is fitted into the remaining hole portion in the long hole 72b into which the second claw portion 63 of the protruding portion 72a of the fourth reflecting bracket 70 is fitted. Further, the plate-like projection 76 of the fourth reflecting bracket 70 is fitted into the remaining hole portion in the elongated hole 52b into which the second claw portion 43 of the protruding portion 52a of the second reflecting bracket 50 is fitted. The plate-like protrusion 66 of the third reflecting bracket 60 is fitted into the remaining hole portion in the elongated hole 42b into which the second claw portion 53 of the protruding portion 42a of the first reflecting bracket 40 is fitted.

  As a result, as shown in FIG. 18, the horizontally polarized wave reflection portion 12 and the vertically polarized wave reflection portion 22 are assembled perpendicularly to each other. Then, the arm 2 is inserted through a circular insertion hole 40e formed in the center of the horizontal polarization reflection portion 12 and a circular insertion hole 60e formed in the center of the vertical polarization reflection portion 22. An orthogonal mounting hole (not shown) is formed at the mounting position of the arm 2, and the screw inserted into the screw hole 78 of the fourth reflective bracket 70 (or the screw hole 68 of the third reflective bracket 60) is mounted on the arm 2. It is inserted into the hole and screwed into the nut fitted into the nut fitting hole 69 of the third reflecting bracket 60 (or the nut fitting hole 79 of the fourth reflecting bracket 70). Further, the screw inserted into the screw hole 58 of the second reflective bracket 50 (or the screw hole 48 of the first reflective bracket 40) is inserted into the mounting hole of the arm 2 to insert the nut fitting hole 49 (of the first reflective bracket 40). Alternatively, it is screwed onto the nut mounted in the nut fitting hole 59) of the second reflective bracket 50. As a result, the horizontally polarized wave reflection portion 12 and the vertically polarized wave reflection portion 22 are fixed to the arm 2 at predetermined positions, and the horizontally polarized wave reflection element 12a and the second horizontally polarized wave reflection element 12b are separated from each other. In the horizontal plane, the vertical polarization reflection element 22a and the second vertical polarization reflection element 22b are arranged in the vertical plane.

Next, in the Yagi-type antenna 1 for dual polarization according to the embodiment of the present invention, the second horizontal polarization reflection element 12b and the second vertical polarization reflection element are provided on the first reflection bracket 40 to the fourth reflection bracket 70. FIG. 19 (a) shows the frequency characteristic of the operating gain on the horizontal polarization side without the 22b, FIG. 19 (b) shows the frequency characteristic of the cross polarization discrimination degree (XPD), and the voltage standing wave ratio (VSWR). 19 (c), the half-value angle frequency characteristic is shown in FIG. 19 (d), and the front-back ratio (FB ratio) frequency characteristic is shown in FIG. 19 (e).
In the Yagi antenna 1 for dual polarization according to the present invention, the operating gain is 10.0 dB or more, XPD is 15.0 dB or more, VSWR is 2.5 or less, half-value angle is 45.0 ° or less, and FB ratio is 15.0 dB. The goal is to be above. Referring to FIG. 19 (a), the maximum operating gain of about 11.9 dB is obtained at 665 MHz, and the frequency characteristic of good operating gain is obtained, which is the minimum operating gain of about 10.4 dB at 617 MHz. Referring to FIG. 19B, a good XPD frequency characteristic is obtained in which the maximum XPD of approximately 41.5 dB is obtained at 581 MHz and the minimum XPD of approximately 25.0 dB is obtained at 671 MHz. With reference to FIG. 19C, a good VSWR frequency characteristic is obtained in which a minimum VSWR of about 1.3 is obtained at 659 MHz to 665 MHz and a maximum VSWR of about 1.5 at 581 MHz to 629 MHz. .. Referring to FIG. 19 (d), a minimum half-value angle of about 29.2 ° is obtained at 671 MHz, and a good half-value angle frequency characteristic of a maximum half-value angle of about 36.3 ° at 581 MHz is obtained. There is. Referring to FIG. 19 (e), a maximum FB ratio of about 21.7 dB is obtained at 581 MHz, and a minimum FB ratio of about 18.3 dB is obtained at 593 MHz, 635 MHz, and 641 MHz. Has been.

Next, in the Yagi-type antenna 1 for dual polarization according to the embodiment of the present invention, the second horizontal polarization reflection element 12b and the second vertical polarization reflection element are provided on the first reflection bracket 40 to the fourth reflection bracket 70. FIG. 20 (a) shows the frequency characteristic of the operating gain on the horizontal polarization side in the case of including 22b, FIG. 20 (b) shows the frequency characteristic of XPD, and FIG. 20 (c) shows the frequency characteristic of VSWR. 20 (d) shows the frequency characteristic of the FB ratio, and FIG. 20 (e) shows the frequency characteristic of the FB ratio.
Referring to FIG. 20 (a), the maximum operating gain of about 11.9 dB is obtained at 587 MHz, 653 MHz and 659 MHz, and the minimum operating gain of about 10.6 dB is obtained at 617 MHz. Has been obtained. Referring to FIG. 20B, a good XPD frequency characteristic is obtained in which a maximum XPD of approximately 40.1 dB is obtained at 581 MHz and a minimum XPD of approximately 24.2 dB is obtained at 635 MHz. Referring to FIG. 20C, a better VSWR frequency characteristic is obtained in which a minimum VSWR of about 1.2 is obtained at 659 MHz and a maximum VSWR of about 1.5 at 581 MHz to 629 MHz. Referring to FIG. 20 (d), a minimum half-value angle of about 28.9 ° is obtained at 671 MHz, and a better half-value angle frequency characteristic of a maximum half-value angle of about 36.3 ° is obtained at 581 MHz. ing. Referring to FIG. 20E, the maximum FB ratio of about 21.2 dB is obtained at 581 MHz, and the frequency characteristic of a good FB ratio that is the minimum FB ratio of about 18.2 dB at 593 MHz is obtained. In this way, the second horizontal polarization reflection element 12b or the second vertical polarization reflection element 22b attached to the first reflection bracket 40 to the fourth reflection bracket 70 functions as an additional reflection element, and It can be seen that at least the characteristics of the operating gain of the shared Yagi antenna 1 are improved.

Next, in the Yagi type antenna 1 for dual polarization according to the embodiment of the present invention, the second reflection element for horizontal polarization 12b and the second emission element for vertical polarization are provided on the first reflection bracket 40 to the fourth reflection bracket 70. FIG. 21 (a) shows the frequency characteristic of the operating gain on the vertical polarization side without 22b, FIG. 21 (b) shows the frequency characteristic of XPD, and FIG. 21 (c) shows the frequency characteristic of VSWR. 21 (d) shows the frequency characteristic of the FB ratio, and FIG. 21 (e) shows the frequency characteristic of the FB ratio.
In the Yagi antenna 1 for dual polarization according to the present invention, the operating gain is 10.0 dB or more, XPD is 15.0 dB or more, VSWR is 2.5 or less, half-value angle is 45.0 ° or less, and FB ratio is 15.0 dB. The goal is to be above. Referring to FIG. 21A, the maximum operating gain of about 12.0 dB is obtained at 665 MHz, and the frequency characteristic of good operating gain is obtained, which is the minimum operating gain of about 10.4 dB at 617 MHz. Referring to FIG. 21B, a good XPD frequency characteristic is obtained in which the maximum XPD of approximately 34.0 dB is obtained at 629 MHz and the minimum XPD of approximately 25.4 dB is obtained at 671 MHz. Referring to FIG. 21 (c), a minimum VSWR of about 1.3 is obtained at 659 MHz to 665 MHz, and a good VSWR frequency characteristic that the maximum VSWR is about 1.5 at 605 MHz to 635 MHz is obtained. .. Referring to FIG. 21 (d), a minimum half-value angle of about 28.8 ° is obtained at 671 MHz, and a good half-value angle frequency characteristic of a maximum half-value angle of about 36.6 ° is obtained at 581 MHz. There is. Referring to FIG. 21E, the maximum FB ratio of about 21.7 dB is obtained at 611 MHz, and the frequency characteristic of a good FB ratio that is the minimum FB ratio of about 19.0 dB is obtained at 599 MHz.

Next, in the Yagi-type antenna 1 for dual polarization according to the embodiment of the present invention, the second horizontal polarization reflection element 12b and the second vertical polarization reflection element are provided on the first reflection bracket 40 to the fourth reflection bracket 70. 22b shows the frequency characteristic of the operating gain on the vertical polarization side in the case of including 22b, FIG. 22 (b) shows the frequency characteristic of XPD, and FIG. 22 (c) shows the frequency characteristic of VSWR. The frequency characteristic is shown in FIG. 22 (d), and the frequency characteristic of the FB ratio is shown in FIG. 22 (e).
Referring to FIG. 22A, a maximum operating gain of about 12.2 dB is obtained at 647 MHz, 653 MHz and 665 MHz, and a minimum operating gain of about 10.6 dB is obtained at 617 MHz. Has been obtained. Referring to FIG. 22B, a good XPD frequency characteristic is obtained in which the maximum XPD of approximately 46.4 dB is obtained at 629 MHz and the minimum XPD of approximately 25.5 dB is obtained at 641 MHz. With reference to FIG. 22C, a minimum VSWR of about 1.3 is obtained at 653 MHz to 665 MHz, and a good VSWR frequency characteristic that the maximum VSWR is about 1.5 at 605 MHz to 635 MHz is obtained. .. With reference to FIG. 22D, a better half-value angle frequency characteristic is obtained in which a minimum half-value angle of about 28.3 ° is obtained at 671 MHz and a maximum half-value angle of about 36.0 ° is obtained at 581 MHz. ing. Referring to FIG. 22E, the maximum FB ratio of about 20.2 dB is obtained at 635 MHz, and the frequency characteristic of a good FB ratio that is the minimum FB ratio of about 17.4 dB is obtained at 665 MHz. In this way, the second horizontal polarization reflection element 12b or the second vertical polarization reflection element 22b attached to the first reflection bracket 40 to the fourth reflection bracket 70 functions as an additional reflection element, and It can be seen that at least the characteristics of the operating gain of the shared Yagi antenna 1 are improved.

In the Yagi antenna for dual polarization according to the present invention described above, the second horizontal polarization reflective element and the second vertical polarization reflective element are provided in the reflective bracket even if the characteristics vary during manufacturing. By providing it, the operating gain can be improved, and the gain deterioration due to the variation in the characteristics can be absorbed. For example, even if the variation in the characteristic of the operating gain is 0.5 dB at the maximum, the operating gain of about 10 dB or more can be secured. That is, the minimum operating gain shown in FIGS. 19 (a) and 21 (a) is about 10.4 dB, and the minimum operating gain of about 9.9 dB is secured even if the characteristics vary, and FIG. 20 (a) and FIG. The minimum operating gain shown in 22 (a) is about 10.6 dB, and even if the characteristics vary, the minimum operating gain of about 10.1 dB is secured.
The Yagi-type antenna for dual-polarization according to the present invention described above is a Yagi-type antenna for dual-polarization for horizontal polarization and vertical polarization. However, the first polarization and the second Yagi antenna orthogonal to the first polarization are used. It can be for polarization. Further, the waveguide element for horizontal polarization and the waveguide element for vertical polarization are described as being stacked in two stages, but they may be stacked in one stage and not stacked.
In the Yagi type antenna for dual polarization according to the present invention described above, the number of stacked rows of the waveguide element for horizontal polarization and the waveguide element for vertical polarization is one or more. can do. In addition, the number of reflection elements for horizontal polarization and the number of reflection elements for vertical polarization may be any number of reflection elements, and the second reflection element for horizontal polarization and the second vertical reflection element for reinforcement and expansion of the reflection bracket may be provided. A polarization reflection element can be provided.
Further, the Yagi-type antenna for dual polarization according to the present invention has the same frequency band for vertical polarization and horizontal polarization. However, the present invention is not limited to this, and communication modes that use individual frequency bands and vertical polarization are used. It can be used in a communication system and a broadcasting business field that perform spatial multiplex communication using both polarizations of waves and horizontally polarized waves.

1 polarized wave Yagi type antenna, 2 arms, 3 poles, 4 stays, 4b mounting screws, 5a mounting brackets, 5b mounting brackets, 10 horizontal polarized radiation section, 10a horizontal polarized radiation element, 10b second horizontal Polarization radiating element, 11 Horizontal polarization waveguide section, 11a Horizontal polarization waveguide element, 12 Horizontal polarization reflection section, 12a Horizontal polarization reflection element, 12b Second horizontal polarization reflection element , 13 Horizontally polarized power feeding part, 13a Main body part, 13b First fitting part, 13c Second fitting part, 13g Semicircular groove part, 13h Insertion hole, 15 Coaxial connector, 20 Vertically polarized wave radiation part, 20a Vertically polarized radiation element, 21 Vertically polarized wave guide section, 21a Vertically polarized wave guide element, 22 Vertically polarized wave reflection section, 22a Vertically polarized wave reflection element, 22b Second vertically polarized wave reflection Element, 23 Vertically polarized power feeding portion, 30 Waveguide bracket, 30a Main body portion, 30b holding portion, 30c insertion hole, 40 first reflection bracket, 40a protruding portion, 40e insertion hole, 41 holding portion, 42 first claw portion , 42a protruding portion, 42b long hole, 43 second claw portion, 43a long groove, 43b fitting groove, 44 caulking hole, 45 holding portion, 46 plate-like projection, 47 insertion hole, 48 screw hole, 49 nut fitting insertion hole , 50 2nd reflection bracket, 50a projection part, 52 1st claw part, 52b long hole, 53 2nd claw part, 53b fitting groove, 55 holding part, 56 plate-like projection, 58 screw hole, 59 nut fitting insertion Hole, 60 third reflection bracket, 60e insertion hole, 62a protrusion, 62b elongated hole, 63 second claw portion, 66 plate-like protrusion, 68 screw hole, 69 nut fitting insertion hole, 70 fourth reflection bracket, 72a protrusion , 72b long hole, 73 second claw portion, 76 plate-like projection, 78 screw hole, 79 nut insertion hole, 101 Yagi type antenna for dual polarization, 110 horizontal polarization side radiating element, 111 horizontal polarization side waveguide element , 112 horizontal polarization side reflection element, 114 vertical polarization side radiation element, 115 vertical polarization side waveguide element, 116 vertical polarization side reflection element, 118 arm, 118a first arm, 118b second arm, 119 shield tube body

Claims (5)

A first polarized wave waveguide section having a first polarized wave waveguide element, a first polarized wave radiator section having a first polarized wave radiation element, and a first polarized wave reflection element having a first polarized wave reflection element. A first Yagi antenna for the first polarization, which includes a wave reflection unit,
A second polarized wave waveguide including a second polarized wave waveguide element, a second polarized wave radiator including a second polarized wave radiating element, and a second polarized wave including a second polarized wave reflective element. A second Yagi antenna for the second polarized wave that is orthogonal to the first polarized wave and that includes a wave reflection portion;
An arm to which the first Yagi antenna and the second Yagi antenna are attached,
The first polarized wave reflection portion has an insulating rod-shaped first polarized wave reflection bracket to which a plurality of the first polarized wave reflection elements are fixed, and the first polarized wave reflection bracket is provided. A second reflection element for second polarization functioning as the reflection element for second polarization is fixed to the surface in the long axis direction of
The second polarization reflection section includes an insulating rod-shaped second polarization reflection bracket to which a plurality of the second polarization reflection elements are fixed, and the second polarization reflection bracket. A Yagi-type antenna for dual-polarization, wherein a second reflection element for the first polarization functioning as the reflection element for the first polarization is fixed to the surface in the major axis direction of. A first polarized wave waveguide section having a first polarized wave waveguide element, a first polarized wave radiator section having a first polarized wave radiation element, and a first polarized wave reflection element having a first polarized wave reflection element. A first Yagi antenna for the first polarization, which includes a wave reflection unit,
A second polarized wave waveguide including a second polarized wave waveguide element, a second polarized wave radiator including a second polarized wave radiating element, and a second polarized wave including a second polarized wave reflective element. A second Yagi antenna for the second polarized wave that is orthogonal to the first polarized wave and that includes a wave reflection portion;
An arm to which the first Yagi antenna and the second Yagi antenna are attached,
The first polarization waveguide element is arranged in two stages in line symmetry with respect to a first line symmetry axis that passes through substantially the center of the arm, and is fixed to the arm. The wave element is substantially orthogonal to the first line symmetry axis, is arranged in two stages in line symmetry with respect to the second line symmetry axis passing through substantially the center of the arm, and is fixed to the arm,
The first polarized wave reflection portion has an insulating rod-shaped first polarized wave reflection bracket to which a plurality of the first polarized wave reflection elements are fixed, and the first polarized wave reflection bracket is provided. A second reflection element for second polarization, which functions as the reflection element for second polarization, is fixed to a surface in the long axis direction of the second reflection element, and the reflection portion for second polarization has a plurality of second reflection elements. An insulating rod-shaped second polarization reflection bracket to which a polarization reflection element is fixed is provided, and the first polarization reflection element is provided on a surface in the long axis direction of the second polarization reflection bracket. A Yagi-type antenna for dual polarization, in which a functioning second polarization element for the first polarization is fixed. The first polarized wave reflection bracket is assembled by fitting end portions of the same shaped first reflective bracket and second reflective bracket, and the second polarized wave reflective bracket includes the first reflective bracket and the second reflective bracket. It is assembled by fitting the ends of a third reflecting bracket and a fourth reflecting bracket of the same shape as the second reflecting bracket,
Plate-shaped first claw portions and second claw portions having different lengths are formed at the end portions of the first to fourth reflection brackets, and the first and second reflection brackets have the same shape. The arm is provided by making the end portion and the end portions of the third reflecting bracket and the fourth reflecting bracket face each other and fitting the second hook portion into the long hole formed in the first hook portion. The Yagi-type shared polarization plate according to claim 1 or 2 , wherein the first polarization reflection bracket and the second polarization reflection bracket each having an insertion hole formed in the center are assembled. antenna. The assembled second polarized wave reflective bracket is arranged substantially orthogonal to the assembled first polarized wave reflective bracket, and is formed at an end of the first reflective bracket to the fourth reflective bracket. By fitting the plate-like protrusions into the remaining holes of the elongated holes of the first claw portion with which the second claw portion is fitted, the reflection bracket for the first polarization and the second polarization plate are fitted. The Yagi-type antenna for dual-polarization according to claim 3 , wherein the wave reflection bracket is fixed substantially orthogonally. The first polarization waveguide section and the second polarization waveguide section each have a waveguide bracket in which eight holding sections are radially formed around the main body section, and the first polarization waveguide section The waveguide element and the second polarization waveguide element are each cut in half, and each of the eight holding portions has an end portion of the first polarization waveguide element arranged in the two stages. And the ends of the second polarization waveguide elements arranged in the two stages are fixed to each other, and the arm is inserted into an insertion hole formed in the center of the waveguide bracket. Dual-polarized Yagi type antenna according to claim 2.

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