JP4053144B2 - Dual-polarized antenna - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dual-polarized antenna, and more particularly to a technique effective when applied to a dual-polarized antenna employed in an indoor repeater for mobile communication or a radiating element of a base station antenna.
[0002]
[Prior art]
In mobile communication such as a cellular phone, indoor use is restricted because radio waves are shielded.
Therefore, an attempt is made to provide a relay device on the ceiling of a public facility such as a station so that a mobile phone can be used indoors.
As an antenna used in this relay device, one having bidirectional directivity is required, and for example, there is a polarization sharing antenna shown in FIG.
FIG. 10 is a perspective view showing a schematic configuration of a conventional dual-polarized antenna having bidirectional directivity.
The dual-polarized antenna shown in the figure realizes bidirectional directivity by combining a pair of radiating element portions (50, 60) on the back surface.
The radiating element unit 50 includes a circular microstrip radiating element 51, a dielectric substrate 52, and a ground conductor 53. The radiating element unit 60 includes a circular microstrip radiating element (not shown), a dielectric substrate 62, It is composed of a ground conductor 63.
Here, the circular microstrip radiation element 51 is formed, for example, by etching a printed wiring board or the like.
[0003]
In the dual-polarized antenna shown in FIG. 10, if the XY plane shown in FIG. 10 is a horizontal plane, the microstrip radiating element 51 is fed from a feeding point 51 _V arranged above the circular microstrip radiating element 51 by a microstrip line. By exciting the outer edge, transmission / reception of vertically polarized waves can be performed.
In addition, by exciting the outer edges of the microstrip element 51 by the microstrip line from the circular microstrip feed point 51 located on the side of the radiating element 51 _H, can be transmitted / received horizontal polarization.
[0004]
By increasing the relative dielectric constant of the dielectric substrate 52, the size of the microstrip radiating element 51 can be reduced. However, since the frequency bandwidth is limited, the microstrip radiating element 51 is downsized and the frequency bandwidth is reduced. However, if a wide band characteristic is required, the thickness of the dielectric substrate 52 needs to be increased.
Furthermore, in order to improve the radiation efficiency, it is desirable to select a dielectric substrate 52 having a low dielectric loss tangent at a high frequency.
[0005]
When the microstrip radiating element 51 is excited in the fundamental mode, for example, in the case of vertical polarization, the phase shift difference between the two outer edges on the Z-axis of the microstrip radiating element 51 is determined to be 180 °.
When excited in this way, the directivity of any polarization becomes maximum radiation in the X-axis direction.
Then, by combining the radiating element units 60 having the same configuration on the back side, an antenna capable of sharing polarization with bidirectional directivity is realized.
In FIG. 10, 54 _H and 54 _V are power dividers for branching power to the two radiating element portions (50, 60) or for synthesizing the power from the two radiating element portions (50, 60). 54 _HC and 54 _VC are input / output terminals.
[0006]
[Problems to be solved by the invention]
When the polarization sharing antenna shown in FIG. 10 is used as an antenna of a relay device installed on the ceiling of a public facility such as a station, the input / output terminal (54 _HC , 54 _VC ) side is the ceiling side, There is a problem that it is difficult to lower the posture and that it is restricted when it is attached to the ceiling.
In addition, the microstrip radiating element 51 formed of an unbalanced planar circuit has a resonance characteristic and a narrow band, and thus is not suitable for frequency division multiplexing mobile communication in which a transmission / reception band is separated like a mobile phone. There was a point.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a technique capable of achieving a wide band and a low profile in a polarization sharing antenna. There is to do.
The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.
[0007]
[Means for Solving the Problems]
Of the inventions disclosed in this application, the outline of typical ones will be briefly described as follows.
(1) A ground conductor, disposed on the ground conductor, a first antenna element whose polarization direction is perpendicular to the ground conductor, and disposed on the ground conductor, the polarization direction Is a dual-polarized antenna comprising a second antenna element in a horizontal direction with respect to the ground conductor, wherein the first antenna element includes an excitation element disposed on the ground conductor, and both ends. There is connected to the ground conductor and electrically, is composed of a half-loop shaped conductive member functioning as a parasitic element, said second antenna elements are arranged on opposite sides of the half-loop shaped electrically conductive members It consists of two sets of dipole elements.
[0008]
(2) In (1), a spacer member having a conductive outer surface is also the least, and the first coaxial feed pipe, predetermined on the ground conductor by the spacer member and the first coaxial feed pipe and a dielectric substrate disposed at a distance, wherein the on one surface of the dielectric substrate, and the strip-shaped conductor, and the two pairs of dipole elements, said strip and said two pairs of dipole elements conductors is a two sets of balanced lines connecting the formation, also wherein the surface of the dielectric one surface of the substrate opposite end connected to the core conductor of the first coaxial feed pipe, the two A first feed line for feeding power to a pair of dipole elements is formed, and the strip-shaped conductor is electrically connected to the ground conductor via the outer surface of the spacer member and the first coaxial feed pipe. connected, the half-loop shaped conductive members, said spacer portion When composed of said a first coaxial feed pipe, portions between the spacer member of the band-shaped conductor first coaxial feed tube.
[0009]
(3) In (2), each dipole element and each balanced line that connects each dipole element and the strip-shaped conductor are conductive in an inverted triangle shape that expands as the distance from the strip-shaped conductor increases. Is the body.
(4) In (2) or (3), the spacer member is a second coaxial feeder, and is located on a surface opposite to the one surface of the dielectric substrate at a position facing the strip-shaped conductor. Is formed with a second feed line that connects between the core conductor of the second coaxial feed pipe and a feed point, and the excitation element has one end open and the other end is the strip-shaped conductor. A first conductor that is connected in a high-frequency manner, a feeding conductor that connects a point separated from one end of the first conductor by a predetermined distance, and a feeding point provided on the dielectric substrate. Composed .
(5) In (2) or (3), the excitation element has a first conductor whose one end is an open end and the other end is connected to the ground conductor in high frequency, and the first conductive element. It is comprised with the electric power feeding conductor which connects one point away from the one end part of the body by the predetermined distance, and the electric power feeding point provided in the said grounding conductor side .
(6) (2) or (3), wherein the excitation element is connected to the feed point, one end of which is provided on the ground conducting side, the other end the ground conductor and the second being a high-frequency connected Consists of a conductor .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
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.
[Embodiment 1]
FIG. 1 is a perspective view illustrating a schematic configuration of a dual-polarized antenna according to Embodiment 1 of the present invention. FIG. 2A is a diagram illustrating a schematic configuration of the dual-polarized antenna according to Embodiment 1. FIG. 4A is a plan view, and FIG. 4B is a cross-sectional view showing a cross-sectional structure taken along the line AA ′ in FIG.
1 and 2, reference numeral 8 denotes a grounding conductor, and the grounding conductor 8 may be a surface of a conductor, even if a metal plate (so-called punching metal) in which holes are appropriately punched is used. Good.
Also, 6 _D, 6 _F are coaxial feed tube, the pedestal (flange) 9 _D is the outside of the outer conductor of the input / output terminal 6 _DIN side of the coaxial feed pipe 6 _D is also coaxial feed pipe 6 _F Input / output terminal 6 _FIN side coaxial feed pipe 6 _F input / output terminal 6 A pedestal 9 _F is provided outside the outer conductor on the _FIN side.
By this pedestal (9 _D , 9 _F ), the outer conductor of the coaxial feeding pipe (6 _D , 6 _F ) and the ground conductor 8 are electrically connected.
Further, a substantially “king” -shaped dielectric substrate 5 is disposed on the coaxial power supply pipe (6 _D , 6 _F ), and a strip-shaped conductor 4 is disposed at the center of the dielectric substrate 5. It is formed.
[0011]
First conductor 7 is composed of inverted L-shape is (hereinafter, referred to as L-shaped conductor.), The L-shaped conductor 7, the vertical portion ₇₁ in the vertical direction with respect to the dielectric substrate 5, composed of a horizontal portion 7 _second horizontal direction with respect to the dielectric substrate 5.
The L-shaped conductor 7 is composed of a metal wire, strip, plate, tube, or the like.
One end portion of the horizontal portion 7 ₂ of the L-shaped conductor 7 is an open end, the one end portion of the vertical portion ₇₁ of the L-shaped conductor 7, the conductor 4 and the high-frequency (AC) is connected.
10 is a power supply conductor, the feeding conductor 10 is connected to a portion 10 of the horizontal portion 7 _{2 B} L-shaped conductor in parallel relation substantially in the conductor 4, between the feeding point 10 _A .
Further, the feeding conductor 10, at the feed point 10 _A, is connected to the microstrip line 3 _FF consisting conductor 4 and the dielectric substrate 5.
In this case, it is necessary to remove the conductors at the main points of the conductor 4 so that the power feeding conductor 10 does not come into electrical contact with the conductor 4.
Here, the wavelength of the central frequency used when the .lamda.o, so that the length from the feeding point 10 _A to the end portion of the horizontal portion 7 _{and second} open ends of the L-shaped conductor 7 becomes substantially .lamda.o / 4 select.
[0012]
The other end of the microstrip line 3 _FF is monkey connected to the core conductor 6 _FC of coaxial feed pipe 6 _F is, in this case, is the core conductor 6 _FC of coaxial feed pipe 6 _F, electrically connected to the conductor 4 In order to avoid this, the conductor at the main part of the conductor 4 is removed.
Outer conductor of coaxial feed pipe 6 _F is electrically connected to the conductor 4, together with the microstrip line 3 _FF, constitute a power supply circuit of the L-shaped conductor 7.
Portion between the outer conductor of the coaxial feed pipe 6 _D and coaxial feed pipe 6 _F, a coaxial feed pipe 6 _D and coaxial feed pipe 6 _F in electrical conductors 4 constitute a half-loop antenna.
This half-loop antenna is electromagnetically coupled to an exciter of an inverted F element composed of an L-shaped conductor 7 and a feed conductor 10, and functions as a parasitic element of an exciter of an inverted F element.
Therefore, if the XY plane shown in FIG. 1 is a horizontal plane with the inverted F-shaped exciter and the half-loop antenna, the vertical polarization, that is, the polarization direction is perpendicular to the ground conductor 8. Thus, a first antenna element having bidirectional directivity in the ± X axis directions is configured.
Note that by selecting the distance between the coaxial power supply pipe 6 _D and the coaxial power supply pipe 6 _F to be a length substantially longer than λo / 4, stronger directivity can be obtained in the ± X-axis directions.
[0013]
Dipole elements (1 ₁ to 1 ₄ ) and balanced lines (2 ₁ to 2 ₄ ) are formed on the “T” portions on both sides of the center of the dielectric substrate 5, and the dipole element ₁₁ and the dipole element 1 _2, and, in the dipole elements 1 ₃ and dipole elements 1 ₄ constitute one dipole antenna element, respectively.
Therefore, in this embodiment, a pair of dipole antenna elements are arranged.
In addition, in FIG. 1, although the case where a plate-shaped dipole element is formed on the dielectric substrate 5 is illustrated, instead of this, metal wires, strips, plates, tubes, etc. can be used, If the conductivity in any case is good, similar characteristics can be obtained.
A pair of balanced line 2 ₁ and balanced line 2 ₂ form a pair of balanced lines, one end of which is electrically connected to dipole element 1 ₁ and dipole element 1 _2, and the other end is electrically conductive. A so-called short stub that is short-circuited by connection with the body 4 is formed.
Similarly, a pair of balanced lines is formed by a pair of the balanced line 2 ₃ and the balanced line 2 _4, one end of the pair is electrically connected to the dipole elements 1 ₃ and dipole elements 1 _4, the other end Forms a so-called short stub that is short-circuited by connection to the conductor 4.
The length of the balanced line ₍₂₁ to _24), when it is determined by the impedance adjustment of the feed line, in which the length of the balanced line ₍₂₁ to ₂₄₎ to .lamda.o / 4, the dipole elements ( 1 ₁ viewed from ~ 1 ₄₎ becomes infinite impedance of so-called short stub side can not influence the impedance of the dipole elements (1 ₁ to 1 _4).
[0014]
Outer conductor of coaxial feed pipe 6 _D is electrically connected to the conductor 4, the core conductor 6 _DC of coaxial feed pipe 6 _D is connected to one end of the microstrip line 3 _DF, also in this case Then, the conductor of the main part of the conductor 4 is removed so that the core conductor 6 _DC of the coaxial feeder 6 _D is not electrically connected to the conductor 4.
[0015]
The electric power input to the input / output terminal 6 _DIN of the coaxial feeder 6 _D does not contact the conductor 4, and the microstrip line 3 _DF composed of the conductor 4 and the dielectric 5 through the core conductor 6 _D. Is supplied with power.
This electric power is divided into two at the point 3 _B , and is fed to the microstrip line 3 ₁ and the microstrip line 3 ₂ which are arranged in a rotationally symmetrical manner in order to perform reverse phase feeding.
Accordingly, in this pair of dipole antenna elements, if the XY plane shown in FIG. 1 is a horizontal plane, the horizontal polarization, that is, the polarization direction is horizontal with respect to the ground conductor 8, and in the ± X axis direction. A second antenna element having bidirectional directivity is configured.
[0016]
Point 3 _A and 3 _C from the tip portion of the microstrip line (3 _1, 3 _2), for electromagnetically coupling to the dipole elements 1 ₂ and dipole elements 1 _3, a microstrip line composed of almost .lamda.o / 4 some order, subjecting the through holes or the like to point 3 _a and point 3 _C of the microstrip line (3 _1, 3 _2), there is no problem even if a DC connection to the dipole elements 1 ₂ and dipole elements 1 ₃ . With such a configuration, it is possible to escape the physical limitations for wiring microstrip line (3 _1, 3 ₂₎ points 3 _A and 3 _C of the distal end of the coupling line of.
Further, in the case of the two pairs of dipole elements (1 ₁ , 1 ₂ ) and dipole elements (1 ₃ , 1 ₄ ) fed in this way, the distance between them is λo / 2 wavelength, so that the XX direction Can have a strong directional characteristic.
[0017]
The feeding circuit of the dipole element (1 ₁ to 1 ₄ ) electrically corresponds to the balanced line (2 ₁ and 2 ₂ ), the balanced line (2 ₃ and 2 ₄ ), and the balanced line (2 ₁ to 2 ₄ ). The microstrip line (3 ₁ , 3 ₂ ) and the conductor 4 form a balanced-unbalanced conversion circuit using a branched conductor, and balanced power is supplied to the dipole elements (1 ₁ to 1 ₄ ).
Therefore, a TEM line such as a metal coaxial tube can be used as shown in FIG. 3 without using a microstrip line.
FIG. 3 is a perspective view showing a schematic configuration of a main part of a modified example of the dual-polarized antenna according to the present embodiment.
In FIG. 3, reference numerals 21 _{1 to} 21 ₄ denote dipole elements, and these dipole elements (21 _{1 to} 21 ₄ ) are formed of metal bars or tubes.
The dipole elements (21 _{1 to} 21 ₄ ) are connected to the parallel coaxial pipes (22 _{1 to} 22 ₄ ) at the connecting portions (23 ₁ to 23 ₄ ).
Parallel coaxial waveguide (22 ₁ to 22 ₄₎ is formed by a coaxial tube metal, having a core conductor 6 _DC therein.
This parallel coaxial waveguide (22 ₁ to 22 _4), the equilibrium by the branch conductors - is unbalanced conversion circuit is formed, balanced feed is made to dipole elements (21 ₁ to 21 _4).
In FIG. 3, reference numeral 24 denotes a strip-shaped conductor formed of a metal plate or a metal box, and the core conductor 6 _DC of the parallel coaxial tube (22 _{1 to} 22 ₄ ) is a strip-shaped conductor 24. through the inside of, and is connected to the coaxial feed pipe 6 _D.
FIG. 4 is a graph showing the directivity characteristics of the electric field component parallel to the XY plane of an example of the dual-polarized antenna according to the present embodiment.
Incidentally, FIG. 4, L-shaped conductor 7, the feeding conductor 10, the conductor 4, coaxial feed pipe 6 _F, coaxial feed pipe 6 _D, the ground conductor 8, and the value of the pair of dipole antenna elements, the following When the value is taken, the directivity characteristic of the electric field component parallel to the plane of the XY plane (based on the coordinates of FIG. 1) appearing at the input / output terminal 6 _DIN of the coaxial feeder 6 _D is observed. Bidirectional directivity characteristics having directivity characteristics on the X axis are obtained.
[0018]
(1) Constant of the L-shaped conductor 7 The L-shaped conductor 7 is a metal plate having a thickness of 0.5 mm and a width of 12 mm, and is formed so as to maintain a distance of 19 mm from the conductor 4. 4 and 106mm horizontal portion 7 _second length which is a parallel to the.
(2) Constant power supply conductor 10 The power supply conductor 10 is formed of a metal column having a diameter of 6 mm.
(3) The constant conductor 4 of the conductor 4 has a width of 50 mm.
(4) Constant coaxial feed pipe 6 _F and coaxial feed pipe 6 _D of the coaxial feed pipe 6 _F and coaxial feed pipe 6 _D is an outer diameter at 16.5 mm, the distance between each of the 200 mm.
(5) The constant ground conductor 8 of the ground conductor 8 is a 500 mm square conductive plate, and the distance between the conductor 4 and the ground conductor 8 is 45 mm.
(6) Distance between the distance dipole elements of the pair of dipole antenna elements ₍₁ 1, 1 ₂₎ and dipole elements (1 _3, 1 ₄₎ is a 167.51Mm.
[0019]
FIG. 5 is a graph showing the directivity characteristics of the electric field component perpendicular to the XY plane of an example of the dual-polarized antenna according to the present embodiment.
FIG. 5 shows the directional characteristics of the electric field component perpendicular to the plane of the XY plane appearing at the input / output terminal 6 _FIN of the coaxial feeder 6 _F under the same constants as in FIG. Bidirectional directivity characteristics having directivity characteristics on the ± X axis.
[0020]
FIG. 6 is a graph showing the frequency characteristics of return loss (return loss) in the cases of FIGS.
_6A shows the characteristics of the input / output terminal 6 _DIN of the coaxial feeder 6 _D , and FIG. 6B shows the characteristics of the input / output terminal 6 _FIN of the coaxial feeder 6 _F. It can be seen that stable characteristics are obtained over a wide band. In particular, FIG. 6B shows that the band characteristics are very wide compared to the conventional inverted-F antenna and loop antenna, so that the electric power excited from the L-shaped conductor 7 and the feeding conductor 10 is reduced. an outer conductor of the coaxial feed pipe 6 _D and coaxial feed pipe 6 _F, electromagnetically coupled to the half-loop antenna consisting of the portion between the coaxial feed pipe 6 _D and coaxial feed pipe 6 _F in the conductor 4, double Based on the principle of the tuning circuit, it can be seen that a wider frequency band is realized.
[0021]
As described above, in the dual-polarized antenna according to the present embodiment, the excitation element of the inverted F-type element and the half-loop antenna that is a parasitic element are electromagnetically coupled, so that the double-tuned circuit of two resonance circuits Broadband characteristics can be realized by the principle.
Further, since the half-loop antenna which is a parasitic element is formed by the strip-shaped conductor 4, a TEM line (for example, a microstrip line (3 ₁ , 3 ₂ , 3 _FF , 3 _DF )) is formed outside. There is no effect.
Further, in the case where the half-loop antenna which is a parasitic element is formed by the strip-shaped conductor 24, there is no influence even if a TEM line (for example, a coaxial line or a triplate line) is formed inside.
Further, the current distribution of the half-loop antenna, which is a parasitic element, becomes maximum near the ground conductor as the starting point and the end point, and the current decreases as the distance from the half-loop antenna increases.
Therefore, since a node of current distribution appears at a location where the distances along the half-loop antenna are equidistant, even if a different structure is added thereto, the influence is small.
In particular, the structure arranged so as to be orthogonal to the loop antenna has less influence, and when the structure formed in this way is a dual-polarized antenna, it can act as an independent antenna.
[0022]
[Embodiment 2]
FIGS. 7A and 7B are diagrams showing a schematic configuration of the dual-polarized antenna according to Embodiment 2 of the present invention. FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view taken along line BB in FIG. It is sectional drawing which shows the cross-sectional structure cut | disconnected by the cutting line.
In FIG. 7, 16 _F is a coaxial plug, 16 _FIN is an input / output terminal, 6 _A is a conductive spacer member, and the other symbols are the same as those in FIGS.
Spacer 6 _A conductive are those in whole is electrically conductive, or may be one that only the outer surface is electrically conductive.
The present embodiment is an embodiment in which the L-shaped conductor 7 and the power supply conductor 10 are arranged on the ground conductor 8 side. Even in such an arrangement, the L-shaped conductor 7 and the power supply conductor are arranged. 10 is a half-loop antenna comprising an outer conductor of the coaxial feeder 6 _F , a spacer member 6 _A, and a portion of the conductor 4 between the coaxial feeder 6 _D and the spacer member 6 _A. Therefore, the same characteristics as those of the dual-polarized antenna according to the first embodiment can be realized.
[0023]
[Embodiment 3]
FIGS. 8A and 8B are diagrams showing a schematic configuration of the dual-polarized antenna according to Embodiment 3 of the present invention. FIG. 8A is a plan view, and FIG. 8B is a cross-sectional view taken along line CC in FIG. It is sectional drawing which shows the cross-sectional structure cut | disconnected by the cutting line.
In FIG. 8, reference numeral 17 denotes a second conductor (hereinafter referred to as a loop element), and other reference numerals are the same as those in FIG. 1, FIG. 2, or FIG.
In the present embodiment, an exciter of a loop-shaped element 17 is used instead of the inverted F-shaped element exciter composed of the L-shaped conductor 7 and the feeding conductor 10.
The length of the loop element 17 is preferably about λo / 2, and is formed of a metal wire, strip, plate, tube, or the like, similar to the inverted F element.
In the present embodiment, the electric power excited by the exciter of the loop element 17 includes the outer conductor of the coaxial feeder 6 _D , the spacer member 6 _A , the coaxial feeder 6 _D of the conductor 4 and the spacer member 6. _{It can} be electromagnetically coupled to a half-loop antenna composed of a portion between _A and a wide band characteristic by the principle of a double-tuned circuit using two resonant circuits, and the same characteristic as that of the first embodiment can be obtained. it can.
[0024]
[Embodiment 4]
FIG. 9 is a diagram showing a schematic configuration of the dual-polarized antenna according to Embodiment 4 of the present invention, where FIG. 9 (a) is a plan view and FIG. 9 (b) is a DD of FIG. It is sectional drawing which shows the cross-sectional structure cut | disconnected by the cutting line.
Dual-polarized antenna of the present embodiment, in the dual-polarized antenna of the third embodiment, the respective dipole element (1 ₁ to 1 _4), and a respective balanced line (21 _{to 24),} a strip-shaped It is composed of an inverted triangular conductor (hereinafter referred to as a notch element) (11 _{1 to} 11 ₄ ) that expands with distance from the conductor 4.
[0025]
In FIG. 9, symbols other than 11 _{1 to} 11 ₄ are the same as those in FIG. 1, FIG. 2, FIG. 7, or FIG.
In Dual-polarized antenna of the present embodiment, as in the case where the using dipole elements (1 ₁ to 1 ₄₎ of each embodiment, it is possible to have a bidirectional directivity in the X-axis direction.
The power that is excited by the exciter loop-shaped element 17, between the outer conductor of the coaxial feed pipe 6 _D, the spacer member 6 _A, a coaxial feed pipe 6 _D and the spacer member 6 _A in the conductor 4 Therefore, the same characteristics as those of the first embodiment can be obtained.
[0026]
Although the invention made by the present inventor has been specifically described based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Of course.
[0027]
【The invention's effect】
The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.
[0028]
According to the present invention, it is possible to obtain a wideband, low-profile polarization sharing antenna.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a dual-polarized antenna according to Embodiment 1 of the present invention.
FIG. 2 is a diagram showing a schematic configuration of a polarization sharing antenna according to the first embodiment.
FIG. 3 is a perspective view showing a schematic configuration of a main part of a modified example of the dual-polarized antenna according to Embodiment 1 of the present invention.
FIG. 4 is a graph showing the directivity characteristics of an electric field component parallel to the XY plane of an example of the dual-polarized antenna according to the present embodiment.
FIG. 5 is a graph showing directivity characteristics of an electric field component perpendicular to the plane of the XY plane of an example of the dual-polarized antenna according to the present embodiment.
6 is a graph showing frequency characteristics of return loss (return loss) in the cases of FIGS. 4 and 5. FIG.
FIG. 7 is a diagram showing a schematic configuration of a dual-polarized antenna according to Embodiment 2 of the present invention.
FIG. 8 is a diagram showing a schematic configuration of a dual-polarized antenna according to Embodiment 3 of the present invention.
FIG. 9 is a diagram showing a schematic configuration of a dual-polarized antenna according to Embodiment 4 of the present invention.
FIG. 10 is a perspective view showing a schematic configuration of a conventional dual-polarized antenna having bidirectional directivity.
[Explanation of symbols]
1 ₁ to 1 ₄ , 21 _{1 to} 21 ₄ ... Dipole element, 2 ₁ to 2 ₄ ... Balanced line, 3 ₁ , 3 ₂ , 3 _DF , 3 _FF ... microstrip line, 4, 24. , 52, 62 ... dielectric substrate, 6 _A ... spacer member, 6 _D , 6 _F ... coaxial feed pipe, 6 _DC , 6 _FC ... core conductor, 6 _DIN , 6 _FIN , 16 _FIN , 54 _HC , 54 _VC ... input / Output terminal, 7... L-shaped conductor (first conductor), 7 ₁ ... Vertical portion of L-shaped conductor 7, 7 ₂ ... Horizontal portion of L-shaped conductor 7, 8, 53, 63. Body, 9 _D , 9 _F ... pedestal, 10 ... feeding conductor, 10 _A , 51 _H , 51 _V ... feeding point, 11 _{1 to} 11 ₄ ... notch type element, 16 _F ... coaxial plug, 17 ... loop type element (second conductor), 22 _{1-22 4} ... parallel coaxial tubes, 23 _{1-23 4} ... connecting portion, 50, 60 ... radiating element, 51 ... circular microstrip -Up radiating element, 54 _H, 54 _V ... power divider.

Claims (6)

A grounding conductor;
A first antenna element disposed on the ground conductor and having a polarization direction perpendicular to the ground conductor;
A dual-polarized antenna comprising a second antenna element disposed on the ground conductor and having a polarization direction horizontal to the ground conductor;
The first antenna element includes an excitation element disposed on the ground conductor;
Both ends are electrically connected to the ground conductor, and are composed of a semi-looped conductive member that functions as a parasitic element,
The dual antenna according to claim 1, wherein the second antenna element is composed of two sets of dipole elements arranged on both sides of the half-looped conductive member. Least a spacer member having an electrically conductive outer surface also,
A first coaxial feeder;
A dielectric substrate disposed at a predetermined interval on the ground conductor by the spacer member and the first coaxial feeder .
The On one surface of the dielectric substrate, and the strip-shaped conductor, wherein the two sets of dipole elements, and the two sets of dipole elements and two sets of balanced lines for connecting the strip-shaped conductor is formed, Further, wherein the surface of the dielectric one surface of the substrate opposite end connected to the core conductor of the first coaxial feed pipe, first feed line is of form to power the two pairs of dipole elements And
The strip-shaped conductor is electrically connected to the ground conductor via the outer surface of the spacer member and the first coaxial feeder.
The semi-looped conductive member includes the spacer member, the first coaxial power supply pipe, and a portion between the strip-shaped conductive spacer member and the first coaxial power supply pipe. The dual-polarized antenna according to claim 1.   Each dipole element and each balanced line that connects each dipole element and the strip-shaped conductor is an inverted triangular conductor that expands as the distance from the strip-shaped conductor increases. The dual-polarized antenna according to claim 2. The spacer member is a second coaxial feeder;
A second feed line connecting the core conductor of the second coaxial feed pipe and the feed point at a position opposite to the belt-like conductor on the surface opposite to the one surface of the dielectric substrate. Formed,
The excitation element has a first conductor whose one end is an open end and the other end is connected to the strip-shaped conductor at a high frequency,
3. The power supply conductor that connects one point that is a predetermined distance away from one end of the first conductor and a power supply point that is provided on the dielectric substrate. 4. The dual-polarized antenna according to 3. The excitation element has a first conductor whose one end is an open end and the other end is connected to the ground conductor at a high frequency,
3. The power supply conductor that connects one point that is a predetermined distance away from one end of the first conductor and a power supply point that is provided on the ground conductor side. 4. The dual-polarized antenna according to 3.   The excitation element includes a second conductor having one end connected to a feeding point provided on the ground conductor side and the other end connected to the ground conductor at a high frequency. The dual-polarized antenna according to claim 2 or claim 3.

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