JP2000031732A - Antenna in common use for polarized wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna in common use for a polarized wave with a broad band and a low height. SOLUTION: The antenna in common use for polarized wave is provided with a ground conductor 8, a 1st antenna element whose direction for a polarized wave is vertical with respect to the ground conductor, and a 2nd antenna element whose direction for a polarized wave is horizontal with respect to the ground conductor, the 1st antenna element consists of an exciting element 7 placed on the ground conductor and conductor members 4, 6D, 6F whose both ends are conductor members connecting electrically to the ground conductor and act as a parasitic element of the exciting element and the 2nd antenna element consists of a couple of dipole antenna elements 11-14 that are placed nearly in parallel with the conductor members and use part of the conductor members as a feeding circuit in common.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-polarization antenna, and more particularly, to a technology effective when applied to a dual-polarization antenna employed in a radiating element of an indoor repeater for mobile communication or a base station antenna. About.

[0002]

2. Description of the Related Art In mobile communications such as cellular phones, indoor use is restricted due to shielding of radio waves. For this reason, it has been attempted 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. An antenna used in this relay device is required to have a bidirectional directional characteristic. For example, a dual-polarization antenna shown in FIG. 10 satisfies this requirement. FIG. 10 is a perspective view showing a schematic configuration of a conventional dual-polarization antenna having bidirectional directional characteristics. The dual-polarization antenna shown in FIG. 1 realizes bidirectional directional characteristics by combining a pair of radiating element units (50, 60) on the back surface. The radiating element unit 50 includes a circular microstrip radiating element 5.
1, a dielectric substrate 52 and a ground conductor 53, and the radiating element section 60 includes a circular microstrip radiating element (not shown), a dielectric substrate 62, and a ground conductor 63. Here, the circular microstrip radiating element 51 is formed by, for example, etching a printed wiring board or the like.

[0003] In the dual-polarization antenna shown in FIG.
Assuming that the XY plane shown in FIG. 0 is a horizontal plane, the outer edge of the microstrip radiating element 51 is excited by the microstrip line from the feeding point 51 _V disposed above the circular microstrip radiating element 51, whereby the vertical polarization is reduced. Transmission / reception can be performed. Further, the microstrip radiating element 5 is connected to a feeding point 51 _H arranged on the side surface of the circular microstrip radiating element 51 by a microstrip line.
Excitation of the outer edge of 1 allows transmission / reception of horizontally polarized waves.

By increasing the relative permittivity 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 can be downsized. If the frequency bandwidth is to be maintained, or if broadband characteristics are required, the thickness of the dielectric substrate 52 must be increased. Furthermore, in order to improve the radiation efficiency, it is desirable to select a dielectric substrate 52 having a small dielectric loss tangent at a high frequency.

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 °. I do. When excited in this manner, the directional characteristics of any polarized waves have maximum radiation in the X-axis direction. The radiating element section 6 having the same configuration
By synthesizing zeros on the back, an antenna that can share a polarization with bidirectional directional characteristics is realized. In FIG. 10, 54 _H and 54 _V are two radiating element portions (50, 6).
0), or two radiating elements (50,
60) a power divider for combining the power from
54 _HC and 54 _VC are input / output terminals.

[0006]

When the dual-polarization antenna shown in FIG. 10 is used as an antenna of a repeater installed on the ceiling of a public facility such as a station, input / output terminals (54 _HC , 54 _{HC) are used} . _{Since the VC} ) side is on the ceiling side, it is difficult to lower the attitude, and there is a problem in that there is a limitation when mounting on the ceiling. In addition, the microstrip radiating element 51 composed of an unbalanced planar circuit has a resonance characteristic and a narrow band, and thus is not suitable for mobile communication of a frequency division multiplexing system in which transmission and reception bands are separated like a mobile phone. There was a point. SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the conventional technique, and an object of the present invention is to provide a technique which can achieve a wide band and a low attitude in a dual-polarization antenna. Is to do. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0007]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows. That is, the present invention provides 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, A dual-polarization antenna having a second antenna element whose polarization direction is horizontal to the ground conductor, wherein the first antenna element includes an excitation element disposed on the ground conductor. And a conductive member having both ends electrically connected to the ground conductor, the conductive member functioning as a parasitic element of the excitation element, and the second antenna element includes the conductive member It is characterized by comprising a pair of dipole antenna elements arranged so as to be substantially parallel and sharing a part of the conductive member as a feeder circuit.

[0008] The present invention also provides a spacer member having at least an outer surface having conductivity, a first coaxial power supply tube, and a predetermined member formed on the ground conductor by the spacer member and the first coaxial power supply tube. A strip-shaped conductor that is electrically connected to the ground conductor by an outer surface of the spacer member and the first coaxial power supply tube on one surface of the dielectric substrate that is arranged with an interval therebetween. And two sets of dipole elements, and two sets of balanced lines connecting the two sets of dipole elements and the strip-shaped conductor are formed. A dielectric substrate on which a first power supply line for supplying power to the two sets of dipole elements is formed, the dielectric member being connected to the core conductor of the coaxial power supply tube, and wherein the conductive member includes the spacer member; Coaxial feed tube and the strip-shaped conductor Characterized in that it is constituted by a portion between the and the pacer member first coaxial feed tube.

[0009] The present invention also provides a driving device, wherein the excitation element has a first conductor open at one end and the other end connected to the band-shaped conductor at a high frequency; It is characterized by comprising a power supply conductor connecting a point at a predetermined distance from one end and a power supply point provided on the dielectric substrate. Further, according to the present invention, the excitation element may be configured such that one end is an open end and the other end is connected to the ground conductor at a high frequency, and a first conductor is connected to one end of the first conductor. It is characterized by comprising a power supply conductor connecting one point at a distance and a power supply point provided on the ground conductor side. Further, according to the present invention, the excitation element includes a second conductor having one end connected to a feeding point provided on the dielectric substrate and the other end connected to the band-shaped conductor at a high frequency. It is characterized by that. Further, according to the present invention, 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 high frequency. It is characterized by the following.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. In all the drawings for describing the embodiments, components having the same functions are denoted by the same reference numerals, and repeated description thereof will be omitted. [Embodiment 1] FIG. 1 is a perspective view showing a schematic configuration of a dual-polarization antenna according to Embodiment 1 of the present invention, and FIG.
It is a figure which shows the schematic structure of the dual-polarization antenna of this Embodiment 1, FIG. (A) is a top view, FIG. (B) cut | disconnected by the AA 'cutting line of the figure (a). It is sectional drawing which shows a cross-sectional structure. In FIGS. 1 and 2, reference numeral 8 denotes a grounding conductor. The grounding conductor 8 may be a metal plate (a so-called punching metal) formed by punching a lattice or an appropriate hole if the surface is a conductor.
May be used. 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 _{DI N} side of the coaxial feed pipe 6 _D is also coaxial feed pipe 6 pedestal 9 _F is provided on the outer side of the outer conductor of the input / output terminal 6 _FIN-side coaxial feed pipe 6 _F input / output terminal 6 _FIN side _F. The pedestal (9 _D, 9 _F), the outer conductor of the coaxial feed pipe (6 _D, 6 _F) and the ground conductor 8 is electrically connected. Further, on the coaxial feed pipes (6 _D , 6 _F ), a substantially “O” shaped dielectric substrate 5 is disposed, and in the center of the dielectric substrate 5, a strip-shaped conductor 4 is provided. It is formed.

Reference numeral 7 denotes a first conductor (hereinafter, referred to as an L-shaped conductor) having an inverted L-shape. The L-shaped conductor 7 has a vertical portion 7 perpendicular to the dielectric substrate 5. ₁
When, and a horizontal portion 7 _second horizontal direction with respect to the dielectric substrate 5. The L-shaped conductor 7 is made of a metal wire,
Consists of strips, plates, tubes, etc. 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 . The power supply conductor 10 is connected to a microstrip line 3 _FF including the conductor 4 and the dielectric substrate 5 at a power supply point 10 _A. In this case, the power supply conductor 1
0 so that the conductor 4 does not electrically contact the conductor 4.
It is necessary to remove conductors at important points. Here, the wavelength of the central frequency used when the .lamda.o, from the feeding point 10 _A L
Length to end a horizontal portion 7 _second open end of the shaped conductor 7 is selected to be approximately .lamda.o / 4.

[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, electricity conductor 4 The conductors at important points of the conductors 4 are removed so as not to be electrically connected. Outer conductor of coaxial feed pipe 6 _F is electrically connected to the conductor 4, together with the microstrip line 3 _FF, L
A power supply circuit of the V-shaped conductor 7 is formed. 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 inverted F-shaped element exciter composed of the L-shaped conductor 7 and the feeding conductor 10, and functions as a parasitic element of the inverted F-shaped exciter. Therefore, if the XY plane shown in FIG. 1 is a horizontal plane between the exciter of the inverted F-shaped element 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 directional characteristics in the ± X-axis direction is configured. Incidentally, the distance between the coaxial feed pipe 6 _D and coaxial feed pipe 6 _F, by selecting substantially .lamda.o / 4 longer than the length, it is possible to obtain a strong directional characteristic by ± X-axis direction.

"T" on both sides of the center of the dielectric substrate 5
The shaped portion of the dipole elements ₍₁ 1 to 1 ₄₎ and the balanced line (21 _{to 24)} is formed, the dipole elements 1 ₁ and dipole elements 1 _2, and, the dipole elements 1 ₃ and dipole elements 1 ₄ Thus, each constitutes one dipole antenna element. Therefore, in the present embodiment, a pair of dipole antenna elements are arranged.
Although FIG. 1 illustrates a case where a plate-shaped dipole element is formed on the dielectric substrate 5, a metal wire, a strip, a plate, a tube, or the like can be used instead. In any case, if the conductivity is good, similar characteristics can be obtained. A pair of balanced line is formed by a pair of balanced line 2 ₁ and the balanced line 2 _2, one end of the pair,
Is electrically connected to the dipole elements 1 ₁ and dipole elements 1 _2, the other end is short-circuited by the connection of the conductor 4, to form a so-called short stub. 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 Is the conductor 4
So-called short stub, which is short-circuited by the connection with 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] the outer conductor of the 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, this Also in such a case, the conductor at a key point of the conductor 4 is removed so that the core conductor 6 _DC of the coaxial feed tube 6 _D is not electrically connected to the conductor 4.

The electric power input to the input / output terminal 6 _DIN of the coaxial feed tube 6 _D is supplied to the microstrip composed of the conductor 4 and the dielectric 5 via the core conductor 6 _D without contacting the conductor 4. _Power is supplied to line 3 _DF . This power is at point 3 _B
2 are distributed, fed to the microstrip line 3 ₁ and a microstrip line 3 ₂ disposed rotationally symmetrically in order to perform the phase fed in. Therefore, if the XY plane shown in FIG. 1 is a horizontal plane with this pair of dipole antenna elements, horizontal polarization, that is, the polarization direction is horizontal to the ground conductor 8 and ± X axis direction A second antenna element having bidirectional directional characteristics is configured.

This microstrip line (3 ₁ ,
3 points 3 _A and 3 _C from the tip portion of _2), for electromagnetically coupling to the dipole elements 1 ₂ and dipole elements 1 _3, because it is a microstrip line consisting of approximately .lamda.o / 4, the microstrip line (3 _1, 3 ₂₎ points 3 _a and point 3 _C subjected to through-holes or the like of, there is no problem even if a DC connection to the dipole elements 1 ₂ and dipole elements 1 _3. With such a configuration, the point 3 _{A of the} microstrip line (3 ₁ , 3 ₂ )
And 3 _C of the distal end of the coupling line can escape the physical limitations for wiring. Further, in the case of the two pairs of dipole elements (1 ₁ , 1 ₂ ) and the dipole elements (1 ₃ , 1 ₄ ) fed in this way, by setting the interval between them to λo / 2 wavelength, the X-X direction Can have a strong directional characteristic.

The feeder circuit of the dipole elements ₍₁ 1 to 1 _4), the electrical, balanced lines (2 _{1, 2} 2), the balanced line _(23, 2 _4), balanced lines (2 ₁ to 2 ₄ ), And the conductor 4 (3 ₁ , 3 ₂ )
The branching conductor Balanced - are unbalanced conversion circuit is formed, balanced feed is made to dipole elements (1 ₁ to 1 _4). Therefore, without using a microstrip line, as shown in FIG.
Lines can be used. FIG. 3 is a perspective view showing a schematic configuration of a main part of a modification of the dual-polarization 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 rods or tubes. The dipole elements (21 ₁ to 21 ₄₎ is a connecting portion (23 ₁ to 23 _4),
It is connected to the parallel coaxial waveguide (22 ₁ to 22 _4). Parallel coaxial waveguide (22 ₁ to 22 ₄₎ is formed by a coaxial tube metal, having a core conductor 6 _DC therein. The parallel coaxial waveguide (22 ₁
The ~ 22 _4), the branch conductor Balanced - unbalanced conversion circuit is formed, balanced feed is made to dipole elements (21 ₁ to 21 _4). In FIG. 3, 24, a strip-shaped conductor is formed of a metal plate, or a metal box, the core conductor of the parallel coaxial waveguide (22 ₁ to 22 ₄₎ 6
_DC passes through the strip-shaped conductor 24 and passes through the coaxial feed tube 6 _D
Connected to FIG. 4 is a graph showing directivity characteristics of an electric field component parallel to the XY plane of an example of the dual-polarization 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 obtained by observing the directional characteristics of electric field component parallel to the plane of the X-Y plane at the input / output terminal 6 _DIN of coaxial feed pipe 6 _D (based on the coordinates of Fig. 1), ± The bidirectional directional characteristic has a directional characteristic on the X axis.

(1) Constant of 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 be spaced apart by 19 mm from the conductor 4. the length of the horizontal portion 7 ₂ be parallel to the conductor 4 to 106 mm. (2) Constant of power supply conductor 10 The power supply conductor 10 is formed of a metal column having a diameter of 6 mm. (3) Constant of Conductor 4 Conductor 4 has a width of 50 mm. (4) coaxial feed pipe 6 _F and coaxial feed pipe 6 constant coaxial feed pipe 6 _F and coaxial feed pipe 6 _D of _D has an outer diameter of 1
6.5 mm, and each interval is 200 mm. (5) Constant of Grounding Conductor 8 The grounding conductor 8 is a 500 mm square conductive plate, and the distance between the conductor 4 and the grounding 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.

FIG. 5 is a graph showing the directional characteristics of an electric field component perpendicular to the XY plane of an example of the dual-polarized antenna according to the present embodiment. Incidentally, FIG. 5, under the same constant as in FIG. 4, at the input / output terminal 6 _{FI N} of coaxial feed pipe 6 _F X
The directional characteristic of the electric field component perpendicular to the -Y plane is observed, and the directional characteristic has a directional characteristic on the ± X axis.

FIG. 6 shows the case of FIG. 4 and FIG.
6 is a graph illustrating frequency characteristics of return loss (return loss). 6 (a) is a characteristic of the input / output terminal 6 _DIN of coaxial feed pipe 6 _D, Fig. 6 (b) shows the characteristics of the input / output terminal 6 _FIN of coaxial feed pipe 6 _F It can be seen that stable characteristics are obtained over a wide band. In particular, FIG. 6 (b) shows that the band characteristic is much wider than that of a conventional inverted F-shaped antenna or loop antenna, so that the 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 It can be seen that the frequency band is broadened based on the principle of the tuning circuit.

As described above, in the dual-polarization antenna according to the present embodiment, the excitation element of the inverted F-type element and the half-loop antenna as the parasitic element are electromagnetically coupled,
Broadband characteristics can be realized by the principle of a double tuning circuit using two resonance circuits. Further, since the half-loop antenna which is a parasitic element is formed by strip-like conductor 4, outside TEM line (e.g., microstrip line _{(3 1, 3 2, 3} FF, 3 DF)) be formed Has no effect. In the case where the half-loop antenna, which is a parasitic element, is formed by the band-shaped conductor 24, forming a TEM line (for example, a coaxial line or a triplate line) inside has no effect. Furthermore, the current distribution of the half-loop antenna, which is a parasitic element, is maximum near the ground conductor, which is the starting point and the ending point, and the current decreases as the distance from the half-loop antenna increases along the half-loop antenna. Therefore, since a node of the current distribution appears at a place where the distances along the half-loop antenna are equidistant, even if a different structure is added thereto, the influence is small. In particular, in a structure arranged orthogonal to the loop antenna, the influence is further reduced. If the structure formed in this way is a dual-polarization antenna, it can function as an independent antenna.

[Second Embodiment] FIG. 7 is a diagram showing a schematic configuration of a dual-polarization antenna according to a second embodiment of the present invention.
FIG. 3A is a plan view, and FIG.
It is sectional drawing which shows the cross-sectional structure cut | disconnected by the cutting line B '. Incidentally, in FIG. 7, 16 _F is coaxial connector, 16 _FIN input / output terminal, 6 _A is a spacer member of electrically conductive, and the other symbols, FIG. 1, the same as in FIG. Spacer 6 _A of conductivity, which in its entirety is electrically conductive,
Alternatively, only the outer surface may have conductivity. In the present embodiment, the L-shaped conductor 7 and the power supply conductor 1
0 is disposed on the ground conductor 8 side,
Even with this arrangement, electric power is excited from feeding conductor 10 and the L-shaped conductor 7, and the outer conductor of the coaxial feed pipe 6 _F, the spacer member 6 _A, coaxial feed pipe in the conductor 4 6 to electromagnetically coupled to half-loop antenna consisting of a portion between the _D and the spacer member 6 _a, it is possible to realize the same characteristics as dual-polarized antenna of the first embodiment.

[Third Embodiment] FIG. 8 is a diagram showing a schematic configuration of a dual-polarization antenna according to a third embodiment of the present invention.
FIG. 3A is a plan view, and FIG.
It is sectional drawing which shows the cross-section structure cut | disconnected by C '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. The present embodiment is an embodiment using an exciter of a loop-shaped element 17 instead of an exciter of an inverted F-shaped element composed of an L-shaped conductor 7 and a power supply conductor 10. The length of the loop-type element 17 is desirably about λo / 2, and is formed of a metal wire, strip, plate, tube, or the like, like the inverted F-type element. In this embodiment, the electric power is excited by the exciter loop-shaped element 17, the outer conductor of the coaxial feed pipe 6 _D, the spacer member 6 _A
And the coaxial feed tube 6 _D and the spacer member 6 in the conductor 4
_A is coupled electromagnetically to a half-loop antenna consisting of a portion between _A and _{A. A} wide band characteristic can be realized by the principle of a double tuning circuit using two resonance circuits, and the same characteristics as in the first embodiment can be obtained. it can.

[Embodiment 4] FIG. 9 is a diagram showing a schematic configuration of a dual-polarized antenna according to a fourth embodiment of the present invention.
FIG. 3A is a plan view, and FIG.
It is sectional drawing which shows the cross-section structure cut | disconnected by the D 'cutting line. The dual-polarization antenna according to the present embodiment is the same as the dual-polarization antenna according to the third embodiment, except that each dipole element ( ₁₁ to
1 _4), and a respective balanced line (21 _{to 24),} inverse triangular conductor widens with distance from the strip conductor 4 (hereinafter, referred to as a notch-shaped element.) (11 ₁ - 1
1 ₄₎ which is constituted by.

[0025] In FIG. 9, reference numeral other than 11 ₁ to 11 _4, FIG. 1, FIG. 2 is the same as FIG. 7 or 8. 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, the outer conductor of the coaxial feed pipe 6 _D, the spacer member 6
_A and, for electromagnetic coupling to the half-loop antenna consisting of the portion between the coaxial feed pipe 6 _D and the spacer member 6 _A in the conductor 4, it is possible to obtain the same characteristics as the first embodiment.

As described above, the invention made by the present inventor is:
Although a specific description has been given based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the invention.

[0027]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

According to the present invention, it is possible to obtain a broadband, low-profile dual-polarized antenna.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a dual-polarization antenna according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a dual-polarization antenna according to the first embodiment.

FIG. 3 is a perspective view showing a schematic configuration of a main part of a modification of the dual-polarization antenna according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an example of the X-polarization antenna according to the present embodiment;
It is a graph which shows the directional characteristic of the electric field component parallel to the plane of the Y plane.

FIG. 5 is a diagram illustrating an example of an X-polarized antenna according to the present embodiment.
It is a graph which shows the directivity of the electric field component perpendicular to the plane of the Y plane.

FIG. 6 is a graph illustrating frequency characteristics of return loss (return loss) in the cases of FIGS. 4 and 5;

FIG. 7 is a diagram illustrating a schematic configuration of a dual-polarization antenna according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating a schematic configuration of a dual-polarization antenna according to a third embodiment of the present invention.

FIG. 9 is a diagram illustrating a schematic configuration of a dual-polarization antenna according to a fourth embodiment of the present invention.

FIG. 10 is a perspective view showing a schematic configuration of a conventional dual-polarization antenna having bidirectional directional characteristics.

[Explanation of symbols]

1 ₁ to 1 _4, 21 ₁ to 21 ₄ ... dipole elements, 2 ₁ ~
2 ₄ … balanced line, 3 ₁ , 3 ₂ , 3 _DF , 3 _FF … microstrip line, 4,24… strip-shaped conductor, 5, 52, 62
... Dielectric substrate, 6 _A ... Spacer member, 6 _D , 6 _F ... Coaxial feed tube, 6 _DC , 6 _FC ... Core conductor, 6 _DIN , 6 _FIN , 16
_FIN , 54 _HC , 54 _VC ... input / output terminals, 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
... ground conductor 9 _D, 9 _F ... pedestal, 10 ... power supply 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 to} 22 ₄ ... parallel coaxial Tube, 23
₁ to 23 ₄ ... connecting part, 50, 60 ... radiating element part, 51 ...
Circular microstrip element, 54 _H, 54 _V ... power divider.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Keiji Sanbon 1 Kanda Iwamotocho, Chiyoda-ku, Tokyo Iwamotocho Building Inside Nippon Denki Kogyo Co., Ltd. (72) Inventor Masayuki Nakano 6-6, Rokubancho, Chiyoda-ku, Tokyo F-term in Japan Mobile Communications Co., Ltd. (reference) 5J021 AA02 AB03 AB04 CA01 FA32 JA00 JA02 JA05

Claims (7)

[Claims] A grounding conductor; a first antenna element disposed on the grounding conductor and having a polarization direction perpendicular to the grounding conductor; and a first antenna element disposed on the grounding conductor. A dual-polarization antenna having a second antenna element whose wave direction is horizontal with respect to the ground conductor, wherein the first antenna element includes an excitation element arranged on the ground conductor, Both ends are a conductive member electrically connected to the ground conductor, and a conductive member functioning as a parasitic element of the excitation element. The second antenna element is substantially the same as the conductive member. A dual-polarization antenna, comprising a pair of dipole antenna elements that are arranged in parallel and share a part of the conductive member as a feeder circuit. 2. A spacer member having at least an outer surface having conductivity, a first coaxial power supply tube, and a predetermined distance above the ground conductor by the spacer member and the first coaxial power supply tube. A dielectric substrate to be disposed, on one surface thereof, a belt-shaped conductor electrically connected to the ground conductor by an outer surface of the spacer member and the first coaxial feed tube; Are formed, and two sets of balanced lines connecting the two sets of dipole elements and the strip-shaped conductor are formed, and one end of the first coaxial feed tube is provided on a surface opposite to one surface thereof. And a dielectric substrate on which a first feed line for feeding power to the two sets of dipole elements is formed, wherein the conductive member includes: the spacer member; the first coaxial feed tube; A spacer member of the strip-shaped conductor; The first
2. The dual-polarized antenna according to claim 1, further comprising a portion between the antenna and the coaxial feed tube. 3. 3. Each of the dipole elements and each of the balanced lines connecting each of the dipole elements and the strip-shaped conductor are inverted triangular-shaped conductors that expand as the distance from the strip-shaped conductor increases. The dual-polarization antenna according to claim 2, wherein: 4. The core conductor of the second coaxial power supply tube, wherein the spacer member is a second coaxial power supply tube, and the dielectric substrate is formed on a surface opposite to one surface thereof. A second power supply line connecting between the power supply point and a power supply point, wherein the excitation element has a first end that is an open end and a second end that is connected to the band-shaped conductor at a high frequency. A point separated from the one end of the first conductor by a predetermined distance;
4. The dual-polarized antenna according to claim 2, further comprising a power supply conductor connected to a power supply point provided on the dielectric substrate. 5. 5. The core conductor of the second coaxial power supply tube, wherein the spacer member is a second coaxial power supply tube, and the dielectric substrate is formed on a surface opposite to one surface thereof. And a second feed line connecting between the power supply point and a power supply point. The excitation element has one end connected to a power supply point provided on the dielectric substrate, and the other end connected to the band-shaped conductor and a high-frequency power supply. The dual-polarized antenna according to claim 2 or 3, wherein the antenna is configured by a second conductor connected to the antenna. 6. The excitation element has an open end at one end,
A first conductor having the other end connected to the ground conductor at a high frequency; a point separated by a predetermined distance from one end of the first conductor;
4. The dual-polarized antenna according to claim 2, further comprising a power supply conductor connected to a power supply point provided on the ground conductor side. 5. 7. The excitation element is formed of 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 high frequency. The dual-polarization antenna according to claim 2 or 3, wherein: