JP2005086658A - Polarization common use antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarization common use antenna which reduces necessary components for constitution of an antenna, and can be produced without time and effort. <P>SOLUTION: A pair of dipole antenna elements for a 1st polarization (for example, for horizontally polarized wave) and a pair of dipole antenna elements for 2nd polarization (for example, vertically polarized wave) are formed on a sheet of a dielectric substrate. Two kinds of circuit patterns are formed on a wiring board, for example, which is fixed on a dielectric substrate by inserting it into the dielectric substrate, etc., and electric power is supplied to a pair of dipole antenna elements for the 1st polarization and a pair of dipole antenna elements for the 2nd polarization. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dual-polarization antenna and an array antenna, and more particularly to a dual-polarization antenna and an array antenna that are suitable for a dual-polarization mobile communication base station antenna that requires high gain.

By sharing the vertical polarization and the horizontal polarization with one antenna, it is possible to effectively use the equipment.
As such a dual-polarized antenna, there is known one in which a pair of dipole antenna elements for vertical polarization and a pair of dipole antenna elements for horizontal polarization are formed above a reflecting plate (the following patent documents) 1).
FIG. 14 is a perspective view showing a configuration of a conventional dual-polarized antenna.
The dual-polarized antenna shown in FIG. 14 is shown in FIG. 14 in the aforementioned patent document.
In FIG. 14, 1 is a reflector, 30 ₁ and 30 ₂ are a pair of dipole antenna elements for horizontal polarization, and 30 ₃ and 30 ₄ are a pair of dipole antenna elements for vertical polarization, these dipole antenna elements. (30 ₁ , 30 ₂ , 30 ₃ , 30 ₄ ) is composed of a metal flat plate.
According to the dual-polarized antenna shown in FIG. 14, the beam width in the horizontal plane is almost the same for both the vertical polarization and the horizontal polarization, so that it is possible to eliminate different service areas.

As prior art documents related to the invention of the present application, there are the following.
Japanese Patent No. 2846609

The above-described dual-polarized antenna shown in FIG. 14 is manufactured by bending eight metal flat plates and fixing the bent eight metal flat plates to the reflecting plate 1.
As described above, the dual-polarized antenna shown in FIG. 14 has many parts necessary for configuring the antenna, and further, it is necessary to assemble with high precision to obtain desired characteristics. There was a problem that it took.
The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to reduce the number of parts necessary for configuring an antenna and to make it without any trouble. Is to provide a polarization-sharing antenna.
Another object of the present invention is to provide an array antenna in which the above-described dual-polarized antennas are arranged in an array.

Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
In order to achieve the above-described object, in the present invention, a pair of dipole antenna elements for a first polarization (for example, for horizontal polarization) and a second polarization for use on a single dielectric substrate. A pair of dipole antenna elements (for example, for vertically polarized waves) is formed.
Further, two types of wiring patterns are formed on the wiring board, and the wiring board is fixed to the dielectric substrate by, for example, a method of inserting it into the dielectric substrate, and a pair of dipole antenna elements for the first polarization The power is supplied to the pair of dipole antenna elements for the second polarization.

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
According to the dual-polarized antenna of the present invention, it is possible to reduce the number of parts necessary for configuring the antenna and to make it without taking time and effort.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.
[Example 1]
FIG. 1 is a perspective view showing a schematic configuration of a dual-polarized antenna according to Embodiment 1 of the present invention.
In the figure, reference numeral 1 denotes a reflecting plate, 2 denotes a dielectric substrate, and the dielectric substrate 2 is arranged in parallel to the reflecting surface of the reflecting plate 1.
Here, in order to maintain the parallel distance between the reflecting plate 1 and the dielectric substrate 2, for example, a solid dielectric is appropriately filled between the reflecting plate 1 and the dielectric substrate 2, or an appropriate material is used. The two spacers are joined together with a spacer.
3 ₁ and 3 ₂ are first and second dipole antenna elements for horizontal polarization, 3 ₃ and 3 ₄ are third and fourth dipole antenna elements for vertical polarization, and 4 forms a feed circuit. Ground conductor.
The length of the conductor constituting each dipole antenna element (3 _{1 to} 3 ₄ ) is an electrical length of λo / 2 (λo is a free space wavelength of the used center frequency (fo)). The use center frequency (fo) is the center frequency of the upper limit frequency and the lower limit frequency that are planned to be used.

FIG. 2 is a diagram showing the configuration of one surface side (the back surface side in FIG. 1) of the dielectric substrate 2 shown in FIG.
As shown in FIG. 2, each dipole antenna element (3 _{1 to} 3 ₄ ) and each ground conductor 4 are provided on one surface side (the back surface side in FIG. 1) of dielectric substrate 2. Each dipole antenna element (3 _{1 to} 3 ₄ ) and the ground conductor 4 are formed by an etching method or the like used in a printed wiring board.
The dipole antenna elements (3 ₁ , 3 ₂ ) are line symmetric with respect to the center point of the dielectric substrate 2. Similarly, the dipole antenna elements (3 ₃ , 3 ₄ ) are line symmetric with respect to the center point of the dielectric substrate 2. Provided.
The ground conductor 4 has _first to _fourth branch portions (4 ₁ to 4 ₄ ) protruding toward the respective dipole antenna elements (3 _{1 to} 3 ₄ ).
Each dipole antenna element (3 _{1 to} 3 ₄ ) has a pair of radiating elements (13 ₁ , 13 ₂ ), and the pair of radiating elements (13 ₁ , 13 ₂ ) 20 _{1 to} 20 ₄ ).
Ground conductor 4 has its center, which substantially coincides with the center point of the dielectric substrate 2, the front end portion of the branch portion ₍₄ 1 to 4 _4), the longitudinal branches ₍₄ 1 to 4 ₄₎ Directional slots (21 _{1 to} 21 ₄ ) are provided.
Each dipole antenna element (3 _{1 to} 3 ₄ ) has a bottom portion of a cut in the width direction (20 _{1 to} 20 ₄ ) provided at the center of the front edge of the radiating element (13 ₁ , 13 ₂ ) and each branch of the ground conductor 4 The slots (21 _{1 to} 21 ₄ ) in the longitudinal direction provided at the front ends of the portions (4 ₁ to _{4 4} ) are continuously provided, and the radiating elements (13 ₁ ) of the dipole antenna elements (3 _{1 to} 3 ₄ ) , 13 ₂ ), the split front end of each branch portion (4 ₁ to 4 ₄ ) of the ground conductor 4 on the inner end of the conductor divided by the cuts in the width direction (20 _{1 to} 20 ₄ ) provided in the center portion of the front edge Each part is connected.

In FIG. 1, reference numerals 5 _{1 to} 5 ₄ denote first to fourth folded conductors that constitute the power feeding circuit.
FIG. 3 is a diagram showing the configuration of the other surface side (surface side in FIG. 1) of the dielectric substrate 2 shown in FIG.
As shown in FIG. 3, the first and second folded conductors (5 ₁ , 5 ₂ ) are line-symmetric with respect to the center point of the dielectric substrate 2 on the other surface (the surface in FIG. 1) of the dielectric substrate 2. Similarly, the third and fourth folded conductors (5 ₃ , 5 ₄ ) are provided in line symmetry with respect to the center point of the dielectric substrate 2.
Folded conductor 5 _1, together with part of the branch portion 4 ₁ of the ground conductor 4, also folded conductive 5 _2, together with part of the branch portion 4 ₂ of the ground conductor 4, respectively branch conductive balanced by - unbalanced conversion circuit (Balance-unbalance conversion circuit by microstrip line) is configured.
Similarly, folded conductors 5 _3, together with a part of the branch portion 4 ₃ of the ground conductor 4, also folded conductive 5 ₄ equilibrium with a portion of the branch portion 4 ₄ of the ground conductor 4, by the respective branch conductors - not A balance conversion circuit (balance-unbalance conversion circuit using a microstrip line) is configured.
Each folded conductors ₍₅ 1 to 5 ₄₎ has one end an open end, the other end of the third and fourth folded conductor ₍₅ 3, _{5 4)} is connected to the first connection terminal 15 ₁ .
The first folded conductors 5 ₁ of the other end is connected to the second connection terminal 15 _2, a second folded conductors 5 ₂ at the other end is connected to the third connection terminal 15 ₃ .
Furthermore, FIG. 2, as shown in FIG. 3, the hole 9 ₁ to the first connection terminal portion 15 ₁ of the area of the dielectric substrate 2, the second connection terminal portions 15 _{and second} regions hole 9 ₂ , the third region of the connecting terminal portion 15 ₃ hole _{9 3} is formed.
Here, each of the folded conductors (5 _{1 to} 5 ₄ ) and each of the connection terminal portions (15 ₁ to 15 ₃ ) are formed by an etching method or the like used for the printed wiring board.

In this embodiment, the wiring substrate 10 shown in FIG. 4 is fixed to the dielectric substrate 2.
FIG. 4 is a perspective view showing the configuration of the wiring board 10 of this embodiment.
As shown in FIG. 4, wiring patterns (11 ₁ , 11 ₂ , 11 ₃ ) are provided on one surface (front surface in FIG. 4) of the wiring substrate 10, and these wiring patterns (11 ₁ , 11 ₂ , 11 ₃ ) is extended to the convex portions (14 ₁ , 14 ₂ , 14 ₃ ) formed at one end of the wiring board 10.
In the area of the wiring pattern 11 ₁ of the other end of the wiring board 10 has a hole 16 ₁ is formed.
A first coaxial plug (not shown) is provided on the other surface (the back surface in FIG. 4) of the wiring substrate 10, and the internal conductor (the first power supply line of the present invention) is provided in the hole 16. It is electrically connected through the ₁ to the wiring pattern 11 _1.
Further, the wiring pattern 11 _{and second} wiring board 10, the other end of the wiring pattern 11 ₃ is connected to the terminal portion 17, the area of the terminal portion 17 of the wiring board 10 has a hole 16 ₂ is formed.
Further, the other surface of the wiring substrate 10, a second coaxial connector (not shown) is provided, the inner conductor (second power supply line of the present invention), the terminal portion through a hole 16 ₂ 17 is electrically connected.
A ground pattern (not shown) is also formed on the other surface of the wiring board 10, and the outer conductors of the first and second coaxial plugs are formed on the other surface of the wiring board 10. Electrically connected to the ground pattern. In this case, the inner conductors of the first and second coaxial plugs are not electrically connected to the ground pattern formed on one surface of the wiring board 10.

As shown in FIG. 5, one convex portion 14 ₁ formed at an end of the wiring board 10, the holes 9 ₁ formed in the dielectric substrate 2, also, the convex portion 14 _2, the dielectric substrate 2 the hole 9 ₂ formed in the further protrusion 14 ₃ is inserted into the hole 9 ₃ formed on the dielectric substrate 2.
FIG. 5 is a schematic diagram, and dimensions of the dielectric substrate 2 and the wiring substrate 10 are different from actual ones.
Then, one end of the wiring pattern 11 _1, a connecting terminal portion 15 ₁ is also one end of the wiring pattern 11 _2, and the connection terminal portions 15 _2, further one end of the wiring pattern 11 _3, the connecting terminal portions 15 ₃ is soldered. The ground pattern formed on one surface of the wiring board 10 is soldered to the ground electrode 4 of the dielectric substrate 2.
Thus, the wiring board 10 is fixed to the dielectric substrate 2, the first return conductor 5 _1, the inner conductor of the second coaxial connector, the excitation power is applied through the wiring pattern 11 _2, further , the second turn back conductor 5 _2, the inner conductor of the second coaxial connector, the excitation power is applied through the wiring pattern 11 _3.
Further, in the third and fourth folded conductive (5 _{3, 5 4),} the inner conductor of the first coaxial connector, the excitation power is applied through the wiring pattern 11 _1.
In this case, the wiring pattern (11 ₁ , 11 ₂ , 11 ₃ ) formed on the wiring substrate 10 is not electrically connected to the ground electrode 4 formed on the dielectric substrate 2.
FIG. 6 is a schematic diagram for explaining a mounting state of the dual-polarized antenna according to the embodiment of the present invention. FIG. 6 is also a schematic diagram, and the dimensions of the reflector 1, the dielectric substrate 2, and the wiring substrate 10 are different from the actual ones.
As shown in FIG. 6, in the dual-polarized antenna of this embodiment, one end of the wiring board 10 is fixed to the dielectric substrate 2 by the method described above, and the other end of the wiring board 10 is further fixed. Passes through the reflector 1 and extends to the back side of the reflector 1. The first and second coaxial plugs described above are provided on the portion of the wiring board 10 that extends to the back side of the reflecting plate 1.
The reflector 1 is fixed to the wiring board 10 by an arbitrary fixing means.

FIG. 7 is a diagram illustrating a modification of the dual-polarized antenna according to the present embodiment.
The dual-polarized antenna shown in FIG. 7 is provided with _{first to fourth} parasitic elements (6 _{1 to} 6 ₄ ) on the other surface side (front surface side in FIG. 1) of the dielectric substrate 2. Different from the dual-polarized antenna shown in FIG.
The first to fourth parasitic elements ₍₆₁ through 65 _4), each dipole antenna element ₍₃ 1 to 3 ₄₎ every provided, the conductors constituting the respective parasitic elements ₍₆₁ through 65 ₄₎ Each of the lengths is an electrical length of λo / 2 (λo is a free space wavelength of a use center frequency (fo)).
Each parasitic element (6 _{1 to} 6 ₄ ) has a bent branch portion formed at a central portion and both end portions provided continuously with the bent branch portion.
The bent branch portion of each parasitic element (6 _{1 to} 6 ₄ ) is provided in the width direction provided at the central portion of the radiating element (13 ₁ , 13 ₂ ) constituting each dipole antenna element (3 _{1 to} 3 ₄ ). It is provided at a position corresponding to the notches (20 _{1 to} 20 ₄ ), that is, at a position where it does not overlap with the folded conductors (5 _{1 to} 5 ₄ ), and both end portions are connected to the dipole antenna elements (3 _{1 to} 3 ₄ ). It is provided at a position where it does not overlap and a line connecting both end portions intersects with each folded conductor (5 _{1 to} 5 ₄ ).
Here, each parasitic element (6 _{1 to} 6 ₄ ) is formed by an etching method or the like used in a printed wiring board.
In the dual-polarized antenna shown in FIG. 7, the resonance characteristics of the dipole antenna elements (3 _{1 to} 3 ₄ ) and the resonance characteristics of the parasitic elements (6 _{1 to} 6 ₄ ) are electromagnetically coupled to each other. Broadband characteristics are realized based on the tuning principle.

FIG. 8 is a graph showing an example of frequency characteristics of the return loss of horizontal polarization in the dual-polarized antenna shown in FIG. In the figure, the horizontal axis is frequency (GHz), the interval is 0.02 GHz, the center frequency is 0.889 GHz, the vertical axis is the attenuation (dB), and the interval is 5 dB.
FIG. 9 is a graph showing an example of frequency characteristics of the return loss of vertically polarized waves in the dual-polarized antenna shown in FIG. In the figure, the horizontal axis is frequency (GHz), the interval is 0.02 GHz, the center frequency is 0.889 GHz, the vertical axis is the attenuation (dB), and the interval is 5 dB.
As shown in FIGS. 8 and 9, in the dual-polarized antenna shown in FIG. 7, the reflection attenuation is between 0.818 GHz (point indicated by 1 in the figure) and 0.96 GHz (point indicated by 3 in the figure). The amount is -15 dB or less (that is, the voltage standing wave ratio (VSWR) is approximately 1.5 or less), and it can be seen that the bandwidth is widened.
FIG. 10 is a graph showing an example of the amount of coupling between polarizations in the dual-polarized antenna shown in FIG. In the figure, the horizontal axis is frequency (GHz), the interval is 0.03 GHz, the center frequency is 0.889 GHz, the vertical axis is the attenuation (dB), and the interval is 10 dB.
As shown in FIG. 10, in the dual-polarized antenna shown in FIG. 7, the amount of coupling between polarizations is between 0.818 GHz (point indicated by 1 in the figure) and 0.96 GHz (point indicated by 3 in the figure). -25 dB or less, it can be seen that the amount of coupling between polarizations is small.
In the wiring board 10 shown in FIG. 4, the interval between the wiring patterns (11 ₁ , 11 ₂ , 11 ₃ ) is increased, or a through hole is formed between the wiring patterns (11 ₁ , 11 ₂ , 11 ₃ ). The amount of coupling between polarizations can be reduced, that is, the characteristics of the amount of coupling between polarizations can be improved.

[Example 2]
The dual-polarized antenna of this embodiment is different from the above-described embodiment in the configuration of the dielectric substrate 2.
Hereinafter, the dual-polarized antenna according to this embodiment will be described focusing on differences from the above-described embodiments.
FIG. 11 is a diagram illustrating a configuration of a dielectric substrate of the dual-polarized antenna according to the second embodiment of the present invention.
In FIG. 11, 3 ₁ and 3 ₂ are first and second dipole antenna elements for horizontal polarization, 3 ₃ and 3 ₄ are third and fourth dipole antenna elements for vertical polarization, and 4 is a feed. Ground conductors 25 ₁ , 25 ₂ , 25 ₃ , and 25 ₄ that form a circuit are conductors that form a power feeding circuit.
The length of the conductor constituting each dipole antenna element (3 _{1 to} 3 ₄ ) is an electrical length of λo / 2 (λo is a free space wavelength of the used center frequency (fo)).
Each dipole antenna element (3 _{1 to} 3 ₄ ) has a pair of radiating elements (13 ₁ and 13 ₂ ).
In this embodiment, the one of the radiating elements 13 ₁ of the pair of the radiating element, a ground conductor 4 is provided on one surface side of the dielectric substrate 2 (in FIG. 1 the back side), the other of the pair of the radiating element a radiating element 13 _{and second} conductor _{(25 1,} 25 _2, 25 3, 25 ₄₎ and is provided on the other surface side of the dielectric substrate 2 (in FIG. 1 the back side).

12 is a diagram showing a configuration of one surface side (the back surface side in FIG. 1) of the dielectric substrate 2 shown in FIG.
Ground conductor 4 has first to fourth protruding portions protruding toward the radiating element 13 ₁ of the first to fourth dipole antenna elements ₍₃ 1 to 3 _{4) (24} 1-24 _4), The tips of the _{first to} fourth protrusions (24 _{1 to} 24 ₄ ) are connected to the radiating elements 13 ₁ of the _first to _fourth dipole antenna elements (3 _{1 to} 3 ₄ ), respectively.
Each dipole antenna element (3 _{1 to} 3 ₄ ) and the ground conductor 4 are formed by an etching method or the like used in a printed wiring board.
FIG. 13 is a diagram showing the configuration of the other surface side (surface side in FIG. 1) of the dielectric substrate 2 shown in FIG.
As shown in FIG. 13, each conductor ₍₂₅ to 253 _4), the tip is respectively connected to the radiating element 13 ₂ of the first to fourth dipole antenna elements ₍₃ 1 to 3 _4).
The other end of the third and fourth conductors ₍₂₅ 3, 25 ₄₎ is connected to the first connection terminal portions 15 _1, The first conductor 25 ₁ at the other end, second connection It is connected to the terminal portion 15 _2, the second conductor 25 ₂ of the other end is connected to the third connection terminal 15 _3.
Here, each conductor (25 _{1 to} 25 ₄ ) and each connection terminal portion (15 ₁ to 15 ₃ ) are formed by an etching technique or the like used for a printed wiring board.

Furthermore, as shown in FIGS. 12 and 13, holes _{9 1} to the first connection terminal portion 15 ₁ of the area of the dielectric substrate 2, the second connection terminal portions 15 _{and second} regions hole _{9 2} , the third region of the connecting terminal portion 15 ₃ hole _{9 3} is formed.
Then, as described above, is one protrusion 14 ₁ formed at an end of the wiring substrate 10 shown in FIG. 5, the holes 9 ₁ formed in the dielectric substrate 2, also, the convex portion 14 _2, the hole 9 ₂ formed in the dielectric substrate 2, further, the convex portion 14 ₃ is inserted into the hole 9 ₃ formed on the dielectric substrate 2.
Then, one end of the wiring pattern 11 _1, a connecting terminal portion 15 ₁ is also one end of the wiring pattern 11 _2, and the connection terminal portions 15 _2, further one end of the wiring pattern 11 _3, the connecting terminal portions 15 ₃ is soldered. The ground pattern formed on one surface of the wiring board 10 is soldered to the ground electrode 4 of the dielectric substrate 2.
Thus, the wiring board 10 is fixed to the dielectric substrate 2, the first conductor 25 _1, the inner conductor of the second coaxial connector, the excitation power is applied through the wiring pattern 11 _2, further to the second conductor 25 _2, the inner conductor of the second coaxial connector, the excitation power is applied through the wiring pattern 11 _3. Further, in the third and fourth conductors ₍₂₅ 3, 25 _4), the inner conductor of the first coaxial connector, the excitation power is applied through the wiring pattern 11 _1.
Here, the reflecting plate 1 is fixed to the wiring board 10 by an arbitrary fixing means.

According to the present embodiment, it is possible to simplify the configuration of the power feeding circuit as compared with the above-described embodiment.
In addition, an array antenna having a required radiation characteristic is configured by arranging the polarization sharing antennas of the above-described embodiments in the electric field direction, the magnetic field direction, or the electric field direction and the magnetic field direction. It is also possible to do.
As described above, according to the dual-polarized antenna according to the present embodiment, it can be formed on a single dielectric substrate by an etching method used for a printed wiring board, etc. Is possible.
In addition, the characteristics of both polarizations can be easily adjusted, and further, it is possible to reduce the variation in characteristics when the polarization-sharing antenna is mass-produced.
As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is a perspective view which shows schematic structure of the polarization sharing antenna of Example 1 of this invention. It is a figure which shows the structure of the one surface side (FIG. 1 back surface side) of the dielectric substrate shown in FIG. It is a figure which shows the structure of the other surface side (FIG. 1 surface side) of the dielectric substrate shown in FIG. It is a perspective view which shows the structure of the wiring board of Example 1 of this invention. It is a schematic diagram for demonstrating the method to fix the wiring board of Example 1 of this invention to a dielectric substrate. It is a schematic diagram for demonstrating the attachment state of the polarization sharing antenna of Example 1 of this invention. It is a figure which shows the modification of the polarization sharing antenna of Example 1 of this invention. It is a graph which shows an example of the frequency characteristic of the return loss of a horizontal polarization in the polarization sharing antenna shown in FIG. It is a graph which shows an example of the frequency characteristic of the return loss of a vertical polarization in the polarization sharing antenna shown in FIG. 8 is a graph showing the amount of coupling between polarizations in the polarization sharing antenna shown in FIG. 7. It is a figure which shows the structure of the dielectric substrate of the polarization sharing antenna of Example 2 of this invention. It is a figure which shows the structure of the one surface side (FIG. 11 back surface side) of the dielectric substrate shown in FIG. It is a figure which shows the structure of the other surface side (surface side in FIG. 11) of the dielectric substrate shown in FIG. It is a perspective view which shows the structure of the conventional polarization shared antenna.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reflector 2 Dielectric board 3 ₁ , 3 ₂ , 3 ₃ , 3 ₄ Dipole antenna element 4 Ground conductor 4 ₁ , 4 ₂ , 4 ₃ , 4 ₄ Branch part 5 ₁ , 5 ₂ , 5 ₃ , 5 ₄ Folded conductor 6 ₁ , 6 ₂ , 6 ₃ , 6 ₄ Parasitic element 9 ₁ , 9 ₂ , 9 ₃ hole 10 Wiring substrate 11 ₁ , 11 ₂ , 11 ₃ Wiring pattern 13 ₁ , 13 ₂ Radiating element 14 ₁ , 14 ₂ , 14 ₃ the projection 15 _{1, 15} 2, 15 ₃ connecting terminal portions 16 _1, 16 ₂ holes 17 terminal portions 20 _{1, 20 2,} 20 3, 20 ₄ cuts 21 ₁ in the width direction, _{21 2,} 21 3, 21 ₄ longitudinal direction of the slot 24 _{1, 24 2,} 24 3, 24 ₄ protrusions 25 _{1, 25 2,} 25 3, 25 ₄ conductors 30 _{1, 30 2,} 30 3, 30 ₄ dipole antenna elements

Claims (3)

A reflector,
A dielectric substrate provided above the reflector;
First and second dipole antenna elements for first polarization provided at a predetermined interval on one surface of the dielectric substrate;
Third and fourth dipole antenna elements for second polarization provided at a predetermined interval on one surface of the dielectric substrate;
A dual-polarized antenna comprising a feeding circuit provided on the dielectric substrate,
The first to fourth dipole antenna elements each have a first radiating element and a second radiating element,
The feeder circuit has a balanced-unbalanced conversion circuit comprising a ground conductor provided on one surface of the dielectric substrate and first to fourth folded conductors provided on the other surface of the dielectric substrate. And
The ground conductor has a slot at the tip, and each tip divided by the slot is connected to the first radiating element and the second radiating element of the first to fourth dipole antenna elements. Having first to fourth branch portions,
The first to fourth folded conductors are provided on the other surface of the dielectric substrate on the first to fourth branch portions so as to surround the slot, and one end is an open end,
The other end of the first folded conductor is connected to a second connection terminal portion,
The other end of the second folded conductor is connected to a third connection terminal portion,
The polarization sharing antenna, wherein the other end of the third folded conductor and the other end of the fourth folded conductor are connected to a first connection terminal portion. A reflector,
A dielectric substrate provided above the reflector;
First and second dipole antenna elements for the first polarization provided at a predetermined interval on the dielectric substrate;
Third and fourth dipole antenna elements for second polarization provided at a predetermined interval on the dielectric substrate;
A dual-polarized antenna comprising a feeding circuit provided on the dielectric substrate,
Each of the first to fourth dipole antenna elements includes a first radiating element provided on one surface of the dielectric substrate and a second radiating element provided on the other surface of the dielectric substrate. And
The power supply circuit includes a ground conductor provided on one surface of the dielectric substrate and first to fourth conductors provided on the other surface of the dielectric substrate,
The ground conductor has first to fourth projecting portions whose tip portions are connected to the first radiating elements of the first to fourth dipole antenna elements,
One end of each of the first to fourth conductors is connected to the second radiating element of the first to fourth dipole antenna elements,
The other end of the first conductor is connected to a second connection terminal portion,
The other end of the second conductor is connected to a third connection terminal portion,
The other end of the third conductor and the other end of the fourth conductor are connected to a first connection terminal portion. A wiring board fixed to the dielectric substrate;
The wiring board has first to third wiring patterns,
One end of the first wiring pattern is connected to the first connection terminal portion, and the other end is connected to the first power supply line.
One end of the second wiring pattern is connected to the second connection terminal portion, and the other end is connected to a second power supply line.
3. The bias according to claim 1, wherein one end of the third wiring pattern is connected to the third connection terminal portion, and the other end is connected to a second power supply line. Wave sharing antenna.

Images