JP6387263B6 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device used in a base station of a mobile communication system such as a mobile phone system.

  In general, an antenna that is used in a base station of a mobile communication system is an omnidirectional antenna in a horizontal plane and a horizontal directivity over a wide band in a vertical plane. As an antenna that satisfies this requirement, an antenna device in which a dipole antenna has a stack structure has been put into practical use (see, for example, Patent Document 1).

  On the other hand, in a system that forms a microcell in a mobile communication system, a directional antenna is used as a base station antenna. A dipole antenna with a reflector is known as a directional antenna. A dipole antenna with a reflector is an antenna that deflects the radiation direction of radio waves toward the side where the dipole is disposed with respect to the reflector by disposing the dipole antenna on a horizontally disposed reflector.

Japanese Patent Publication No. 5-28922

  However, a dipole antenna requires an element length of ½ wavelength, and it is generally difficult to shorten the element length while maintaining a desired polarization and gain. On the other hand, communication carriers are demanding further miniaturization of antenna devices, and in order to meet this demand, it is necessary to develop antennas that are not bound by existing concepts.

  The present invention has been made paying attention to the above circumstances, and an object of the present invention is to provide an antenna device capable of further miniaturizing the device by shortening the element length while maintaining a desired polarization. There is to do.

  In order to achieve the above object, a first aspect of the present invention is a second reflecting plate which is erected on a first reflecting plate (11) having conductivity and set to the same potential as the first reflecting plate. (12) and an antenna element (2) arranged to extend in a direction parallel to the first reflector (11) from the tip of one side of the second reflector (12) via an insulating portion. 13), and the antenna element (13) and the second reflector (12) cooperate to form polarized waves in a direction parallel to the first reflector (11). It is a thing.

  According to a first aspect of the present invention, the second reflector (12) and the antenna element (13) are formed on a first surface of an insulating substrate (16), respectively. A conductive strip (15a), (15b) is formed on the second surface of the insulating substrate (16) on the backside of the first conductive pattern (15a). It is also characterized by forming e).

  The second aspect of the present invention includes a first reflecting plate (11d) having conductivity and first elements (21a, 21b) arranged in parallel with the first reflecting plate (11d). The first antenna (20) having a first frequency band as a resonance band, and disposed between the first reflector (11d) and the first antenna (20). From the first frequency band And a second antenna (10a to 10d) having a high second frequency band as a resonance band. The second antenna (10a to 10d) includes a second reflector (12) which is set up perpendicular to the first reflector (11d) and set to the same potential as the first reflector, It arrange | positions so that it may extend | stretch in parallel with a said 1st reflecting plate from the front-end | tip part of one side edge of a 2nd reflecting plate (12) through an insulation part, and it cooperates with a said 2nd reflecting plate, and a said 1st A second element (13) that forms polarized waves in a direction parallel to the reflector (11d), and a conductor in the polarization direction of the second reflector (12) and the second element (13). The total length is set to a length shorter than the width of the first element (21a, 21b).

The second aspect of the present invention is also characterized by comprising the following various aspects.
In the first aspect, when the wavelength corresponding to the upper end frequency of the first frequency band is λ _{B in} the second antenna (10a to 10d), the total conductor length is 0.3λ _B or less. It is comprised so that it may become.

In the second aspect, when the wavelength corresponding to the lower end frequency of the second frequency band is λ _C , the first antenna (20) is moved in the vertical direction from the first reflector (11d). with placing approximately 0.5 [lambda _C spaced locations, said second antenna (10 a to 10 d), so that the conductor length in the vertical direction of the second reflector (12) is about 0.25 [lambda _C It is composed.

  In the third aspect, the vicinity of the feeding point of the first antenna (20) is supported by a pair of metal conductors (43) erected on the first reflecting plate. .

  According to a third aspect of the present invention, there is provided a first reflecting plate (30) having conductivity and a first element (41a, 41b) arranged in parallel to the first reflecting plate. A first antenna (40) having a frequency band as a resonance band, and a second frequency band that is disposed between the first reflector and the first antenna and is higher than the first frequency band is a resonance band. The second antenna (60a to 60d) and the director (50) disposed on the opposite side of the first antenna from the first reflector. The second antenna (60a to 60d) includes a second reflector (15a) that is set up perpendicular to the first reflector (30) and set to the same potential as the first reflector; It arrange | positions so that it may extend | stretch in parallel with the said 1st reflecting plate from the front-end | tip part of the one side edge of the said 2nd reflecting plate via an insulating part, and it cooperates with a said 2nd reflecting plate and the said 1st reflection A second element (15b) that forms a polarization in a direction parallel to the plate. The director (50) includes a first parasitic element (52a, 52b) that operates on the first frequency band and a second parasitic element (53a, 53b) that operates on the second frequency band. Is provided.

  According to the first aspect of the present invention, the second reflector and the element operate as a monopole element that forms a polarization in a direction parallel to the first reflector. In addition, by appropriately setting the conductor length in the height direction of the second reflector and the element, the conductor length in the horizontal direction of the second reflector and the element can be made shorter than ½ wavelength. In other words, it is possible to reduce the element length while maintaining the polarization, thereby further reducing the size of the antenna device.

  Further, the first and second conductive patterns are formed on one surface of the insulating substrate, and the second reflecting plate and the element are back-to-back with respect to the formation position of the second reflecting plate on the other surface of the insulating substrate. By forming a microstrip line for power feeding at the position where the power is fed, it is possible to shorten the route of the coaxial cable and make the power feeding structure compact compared to when feeding power to the antenna element only with the coaxial cable. Become.

  Furthermore, it is possible to form an open stub or a short stub by further extending the microstrip line from the feeding point, thereby enabling impedance adjustment.

  According to the second aspect of the present invention, the total length of the conductors of the horizontal portions of the second reflector and the element of the second antenna is shorter than the element length of the horizontal plate-shaped element of the first antenna. The second antenna can be prevented from resonating in the frequency band of the first antenna. As a result, the first antenna and the second antenna can be arranged close to each other to form a compact configuration, and a multi-circular antenna device with less inter-antenna interference can be configured.

  In addition, by arranging the second antenna at an appropriate position between the first antenna and the first reflector, the first element of the first antenna is used as a parasitic element of the second antenna. This makes it possible to operate, thereby further widening the resonance band of the second antenna.

  Further, if the first antenna is configured to be supported by a metal conductor erected on the first reflector, a sheet metal used for the first reflector can be used as a support member. As a result, the number of parts and the cost can be reduced as compared with a case where a dedicated support member is separately prepared.

  According to a third aspect of the present invention, there is provided a first antenna having a first element arranged in parallel to the first reflector, and a second element arranged perpendicular to the first reflector. The second antenna is disposed in an appropriate positional relationship, and has a parasitic element that acts on the first antenna and the second antenna at a position opposite to the first reflector of the first antenna. By further providing a director, it is possible to further expand the resonance frequency bands of the first and second antennas.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of the antenna device which concerns on 1st Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The figure which shows the structure of the general dipole antenna with a reflecting plate. The structure of the antenna device which concerns on 2nd Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 3rd Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 4th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 5th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 6th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 7th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The perspective view when the whole structure of the antenna apparatus shown in FIG. 6 is seen from diagonally upward. The structure of the antenna device which concerns on 8th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The structure of the antenna device which concerns on 9th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The perspective view when the whole structure of the antenna apparatus shown in FIG. 11 is seen from diagonally upward. The perspective view which looked at the whole structure of the antenna device which concerns on 10th Embodiment of this invention from diagonally upward. The perspective view when the whole structure of the antenna device which concerns on 10th Embodiment of this invention is seen from diagonally downward. The structure of the antenna device which concerns on 10th Embodiment of this invention is shown, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. The perspective view which looked at the structure of the antenna apparatus which concerns on 11th Embodiment of this invention from diagonally upward. The top view of the antenna apparatus shown in FIG. The side view of the antenna apparatus shown in FIG. The perspective view which looked at the state which attached the director to the antenna apparatus shown in FIG. 16 from diagonally upward. FIG. 20 is a plan view of the antenna device shown in FIG. 19. The side view of the antenna apparatus shown in FIG. The top view which shows the surface structure of the waveguide provided in the antenna apparatus shown in FIG. The top view which shows the back surface structure of the waveguide provided in the antenna apparatus shown in FIG. The disassembled perspective view which looked at the antenna support structure of the antenna apparatus shown in FIG. 19 from diagonally upward. The disassembled perspective view which looked at the antenna support structure of the antenna apparatus shown in FIG. 19 from diagonally downward. The perspective view which looked at the structure of the antenna apparatus which concerns on 12th Embodiment of this invention from diagonally upward. The top view of the antenna apparatus shown in FIG. The side view of the antenna apparatus shown in FIG. The side view which shows the structure of the surface of the vertical plate-shaped antenna in the antenna apparatus shown in FIG. The side view which shows the structure of the back surface of the vertical plate-shaped antenna in the antenna apparatus shown in FIG. The perspective view which looked at the state which attached the horizontal plate-shaped antenna to the antenna apparatus shown in FIG. 26 from diagonally upward. FIG. 32 is a plan view of the antenna device shown in FIG. 31. The side view of the antenna apparatus shown in FIG. The perspective view which looked at the state which attached the director further to the antenna apparatus shown in FIG. 31 from diagonally upward. The top view of the antenna apparatus shown in FIG. The side view of the antenna apparatus shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a configuration of an antenna device according to a first embodiment of the present invention. (A) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there.

  The antenna device according to the present embodiment includes a first reflecting plate 11 having a substantially square shape. The first reflecting plate 11 is made of a metal conductor and is manufactured using, for example, a sheet metal. On the first reflector 11, a second reflector 12 is erected vertically. The second reflecting plate is also made of a metal conductor, and is connected to the first reflecting plate 11 directly or via a cable so as to have the same potential as the first reflecting plate 11 in a direct current. Composed.

  The element 13 is attached to the tip of one side of the second reflector 12 via an insulating member (not shown). The element 13 has a strip shape and is arranged so as to extend from one side of the second reflecting plate 12 in a direction parallel to the first reflecting plate 11. A feeding point F is provided at the tip of one side of the second reflecting plate 12, and the feeding point F is connected to a wireless circuit (not shown) via a feeding cable.

  By the way, the antenna device of this embodiment uses 2.4-2.5 GHz as a resonant frequency band, for example. For this purpose, the vertical length of the second reflecting plate 12 is set to about 0.25λ when the wavelength corresponding to the lower end frequency (2.4 GHz) of the resonance frequency band is λ. . The conductor length in the horizontal direction of the second reflector 12 is set to 0.15λ, so that the total conductor length in the horizontal direction of the second reflector 12 and the element 13 is 0.3λ or less. ing.

  Due to such a configuration, the second reflector 12 and the element 13 operate as a monopole element, thereby forming a polarization H in a direction parallel to the first reflector 11, that is, in the horizontal direction in the figure. Is done. The second reflecting plate 12 is set to the same potential as the first reflecting plate 11 in a direct current, and the vertical height of the second reflecting plate 12 is set to about 0.25λ and the horizontal direction is set. Since the conductor length at is set to 0.15λ, the total conductor length in the horizontal direction of the second reflector 12 and the element 13 can be shortened to 0.3λ or less. As a result, the antenna device can be further downsized.

  Incidentally, in a general dipole antenna with a reflector, for example, as shown in FIG. 2, the dipole elements 14 a and 14 b are arranged in the horizontal direction with respect to the feeding point F to form polarized waves in the horizontal direction H. For this reason, an element length of 0.5λ is required, and it is difficult to further reduce the antenna size. Further, in order to dispose the dipole elements 14a and 14b above the reflecting plate 11 in a state of being separated from the reflecting plate 11, it is necessary to separately prepare a support member (not shown). For this reason, the number of parts increases and an increase in cost cannot be avoided.

[Second Embodiment]
FIG. 3 shows a configuration of an antenna apparatus according to a second embodiment of the present invention, where (a) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  A vertical plate antenna is erected on the first reflecting plate 11. This vertical plate-like antenna is formed by forming a slit 15c on a single metal conductor plate from the upper side to the lower side while leaving a part of the lower side, thereby reversing the rectangular second reflecting plate 15a. An L-shaped antenna element 15b is configured. The second reflecting plate 15a is connected to the first reflecting plate 11 directly or via a cable, and is thereby configured to have the same DC potential as the first reflecting plate 11. A feeding point F is provided at the tip of one side of the second reflecting plate 15a, and the feeding point F is connected to a wireless circuit (not shown) via a feeding cable.

  The length from the upper end of the second reflector 15a to the bottom of the slit 15c is set to about 0.25λ when the wavelength corresponding to the lower end frequency (2.4 GHz) of the resonance frequency band is λ. The total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is set to 0.3λ or less.

  With such a configuration, the second reflector 15a and the antenna element 15b are connected via the detour circuit E having a length of 0.5λ. For this reason, the second reflecting plate 15a, the detour circuit E, and the antenna element 15b operate as monopole elements, and thereby polarized waves are formed in a direction parallel to the first reflecting plate 11, that is, in the horizontal direction in the figure. .

  The second reflector 15a, the bypass circuit E, and the antenna element 15b are set to the same potential as the first reflector 11 in terms of DC. The vertical height of the second reflector 15a is set to about 0.25λ, so that the total conductor length in the horizontal direction of the second reflector 12 and the antenna element 13 is 0.3λ or less. Can be set. For this reason, the element length can be shortened as compared with a general dipole antenna with a reflecting plate, and thus the antenna device can be miniaturized.

  Moreover, the second reflecting plate 15a and the antenna element 15b are integrally manufactured from a single metal plate. For this reason, an antenna element can be comprised by a single component, and, thereby, cost reduction can be expected.

[Third Embodiment]
FIG. 4 shows a configuration of an antenna device according to a third embodiment of the present invention, where (a) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  A vertical plate antenna is erected on the first reflector 11. In this vertical plate antenna, a rectangular first conductive pattern constituting the second reflector 15a and an L-shaped second conductive pattern constituting the antenna element 15b are formed on one surface of the insulating substrate 16. doing. A slit 15c is formed between the first conductive pattern and the second conductive pattern, leaving a part of the lower end thereof, thereby forming a bypass circuit E.

  On the other hand, an L-shaped microstrip line 15d is formed on the other surface of the insulating substrate 16 so as to be back to back with respect to the first conductive pattern constituting the second reflecting plate 15a. It is formed in a horizontal direction with respect to the plate 11. The microstrip line 15d constitutes a part of the feeding path, and a feeding part F is provided at one end and a feeding cable connection point G is provided at the other end. The power feeding part F is connected to the power feeding point of the antenna element 15b through a through hole, and a power feeding cable (not shown) is connected to the power feeding cable connection point G.

  The length from the upper end of the second reflecting plate 15a to the bottom end of the slit 15c is set to about 0.25λ when the wavelength corresponding to the lower end frequency (2.4 GHz) of the resonance frequency band is λ. . The total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is set to 0.3λ or less.

  Due to such a configuration, the second reflector 15a and the antenna element 15b are connected via the detour circuit E having a length of 0.5λ, as in the second embodiment. For this reason, the second reflecting plate 15a, the detour circuit E, and the antenna element 15b operate as monopole elements, and thereby polarized waves are formed in a direction parallel to the first reflecting plate 11, that is, in the horizontal direction in the figure. .

  The second reflector 15a, the bypass circuit E, and the antenna element 15b are set to the same potential as the first reflector 11 in terms of DC. The vertical height of the second reflector 15a is set to about 0.25λ, so that the total conductor length in the horizontal direction of the second reflector 12 and the element 13 is set to 0.3λ or less. can do. For this reason, the element length can be shortened as compared with a general dipole antenna with a reflecting plate, and thus the antenna device can be miniaturized.

  Further, since the second reflector 15a and the antenna element 15b can be easily formed by edging or the like, there is an advantage that they can be manufactured at low cost. In addition, since the microstrip line 15d is formed on the other surface side of the insulating substrate 16 and is used as a part of the feeding path, the feeding cable length is shortened and the feeding cable in a portion overlapping the vertical plate antenna is used. It is possible to eliminate the need for routing space.

[Fourth Embodiment]
FIG. 5 shows a configuration of an antenna device according to a fourth embodiment of the present invention, in which (a) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  The fourth embodiment is different from the third embodiment in that an inverted L-shaped microstrip line 15 f is formed on the back surface side of the insulating substrate 16 in a direction perpendicular to the first reflector 11. That is, a feeding cable connection point G is provided at the lower end.

  The microstrip line 15f is arranged back-to-back with respect to the second reflector 15a, and is provided with a power feeding part F at one end and a power feeding cable connection point G at the other end. The power feeding part F is connected to the power feeding point of the antenna element 15b through a through hole, and a power feeding cable (not shown) is connected to the power feeding cable connection point G.

  Since it is such a configuration, the microstrip line 15f is used as a part of the feeding path as in the third embodiment, so that the feeding cable length is shortened and the feeding cable at the portion overlapping the vertical plate antenna is used. It is possible to eliminate the need for routing space. Further, in the present embodiment, the microstrip line 15f is arranged in the vertical direction, and the power supply cable connecting portion G is provided at the lower end thereof, so that the power supply cable is simply wired along the first reflector 11 and the above-mentioned There exists an advantage which can be connected to the electric power feeding cable connection part G. FIG.

  The line width of the microstrip line 15f may be set to be partially wide so that the wide part functions as a stub. The impedance matching of the antenna can be realized by this stub.

[Fifth Embodiment]
FIG. 6 shows the configuration of an antenna device according to a fifth embodiment of the present invention. (A) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  The fifth embodiment is different from the fourth embodiment in that an inverted L-shaped microstrip line 15 f is formed on the back surface side of the insulating substrate 16 in a direction perpendicular to the first reflector 11. The stub 15g is formed at the feeding point F. The stub 15g is disposed back to back with respect to the antenna element 15b. The stub 15g is used for impedance matching as an open stub or a short stub.

  Since it is such a configuration, the microstrip line 15f is used as a part of the feeding path as in the fourth embodiment, so that the feeding cable length is shortened and the feeding cable at the portion overlapping the vertical plate antenna is used. It is possible to eliminate the need for routing space. Furthermore, impedance matching can be performed by providing the stub 15g at a position that is back to back with respect to the antenna element 15b.

[Sixth Embodiment]
FIG. 7: shows the structure of the antenna device which concerns on 6th Embodiment of this invention, (a) is the top view, (b)-(e) is a side view when it sees from four different directions. is there. In the figure, the same parts as those in FIG.

  The first reflecting plate 11a has a rectangular shape, and two vertical plate antennas 10a and 10b are erected in parallel on the first reflecting plate 11a with a certain distance therebetween. These vertical plate antennas 10a and 10b are arranged so that the surfaces on which the second reflector 15a and the antenna element 15b are formed face the same direction, and are used in a state where the magnetic field surfaces of the antennas are stacked.

In the vertical plate antennas 10a and 10b, the length from the upper end of the second reflecting plate 15a to the bottom end of the slit 15c is the lower end frequency (2.4 GHz) of the resonance frequency band as in the sixth embodiment. When the wavelength corresponding to is λ, it is set to about 0.25λ. The total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is set to 0.3λ or less.
Note that the length of the first reflecting plate 11a in the longitudinal direction and the interval between the vertical plate antennas 10a and 10b are appropriately set according to the directivity to be generated in the antenna device.

  FIG. 9 is a perspective view showing an installation example of the antenna device according to the present embodiment. This example shows a case where the antenna device is installed on the wall surface, and the first reflecting plate 11a is fixed to the wall surface by screwing using the wall surface mounting bracket 7a. Reference numeral 8a denotes a cover, and 9a denotes an input / output unit.

  Since it is such a structure, the characteristics of both antennas are synthesized by forming the vertical plate antennas 10a and 10b into a magnetic field surface stack, thereby providing a high-gain directional antenna device. Further, since the horizontal length of the vertical plate antennas 10a and 10b can be set to 0.3λ or less, the length of the first reflector 11a in the short side direction (width direction) is set to 0.5λ or less. Thus, the size of the antenna device in the width direction can be reduced.

[Seventh Embodiment]
FIG. 8 shows a configuration of an antenna device according to a seventh embodiment of the present invention, where (a) is a plan view thereof, and (b) to (e) are side views when viewed from different four directions. is there. In the figure, the same parts as those in FIG.

  The first reflecting plate 11b has a rectangular shape, and two vertical plate antennas 10a and 10b are erected on the first reflecting plate 11b in a state of being arranged on a straight line. These vertical plate antennas 10a and 10b are arranged so that the surfaces on which the second reflector 15a and the antenna element 15b are formed face the same direction, and are used in a state where they are stacked in the direction of the electric field of the antenna.

  Since it is such a structure, the characteristics of both antennas are synthesized by forming the vertical plate antennas 10a and 10b into an electromagnetic surface stack, thereby providing a high gain directional antenna device. In addition, since the length in the width direction of the vertical plate antennas 10a and 10b can be set to 0.3λ or less, the stack interval of the vertical plate antennas 10a and 10b can be set to 0.6λ or less. Thus, the directivity adjustment range can be expanded.

  FIG. 8 illustrates the case where the vertical plate antennas 10a and 10b having the same configuration are arranged in a horizontal row. However, the present invention is not limited thereto, and vertical plate antennas 10a and 10b configured so that the formation positions of the second reflecting plate 15a and the antenna element 15b are opposite to each other are prepared, and the vertical plate antennas 10a and 10b are prepared. It may be arranged in a horizontal row. With this configuration, the gain as the antenna device can be further increased.

[Eighth Embodiment]
FIG. 10 shows a configuration of an antenna device according to an eighth embodiment of the present invention. (A) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  In the antenna device according to the present embodiment, a pair of vertical plate antennas 10a and 10b stacked in a magnetic field plane and a pair of vertical plate antennas 10c and 10d2 stacked in a magnetic field plane on the first reflector 11c. Are arranged in a state in which the directions are different from each other by 90 degrees. Each of the pairs 10a, 10b and 10c, 10d of the vertical plate antennas is arranged such that the surfaces on which the second reflector 15a and the antenna element 15b are formed face the same direction.

  Further, the feed points F provided in the pairs 10a, 10b and 10c, 10d of the vertical plate antennas are mixed by the mixers 19, 19 via the feed cables 18a, 18b and 18c, 18d for each pair, These mixers 19 and 19 are connected to different systems of radio circuits via power supply cables (not shown).

  Furthermore, when the wavelength corresponding to the lower end frequency (2.4 GHz) of the resonance frequency band is λ, each of the vertical plate antennas 10a to 10d is a conductor in the horizontal direction of the second reflector 15a and the antenna element 15b. The total length is set to 0.3λ or less. In addition, the arrangement interval of each pair 10a, 10b and 10c, 10d of the vertical plate antenna is set to be 0.5λ.

  Because of such a configuration, the directivity of each of the vertical plate antennas 10a, 10b and 10c, 10d stacked in the magnetic field plane is different by 90 degrees in the direction parallel to the first reflector 11c. Polarization is generated. Further, each of the vertical plate antennas 10a to 10d is configured such that the total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is 0.3λ or less, so that two pairs of antennas are formed. When arranging the vertical plate antennas 10a, 10b and 10c, 10d stacked in the magnetic field plane, the size of the antenna device can be reduced while maintaining the isolation between the antenna pairs.

[Ninth Embodiment]
FIG. 11 shows a configuration of an antenna device according to a ninth embodiment of the present invention, where (a) is a plan view thereof, and (b) to (e) are side views when viewed from four different directions. is there. In the figure, the same parts as those in FIG.

  The difference of the configuration of the present embodiment from the eighth embodiment is that when the pair of vertical plate antennas 10a, 10b and 10c, 10d are arranged in parallel, the second reflector 15a and the antenna are arranged. That is, the surface on which the element 15b is formed is set to face in the opposite direction (both in FIG. 11, the outer direction). In order to cope with this arrangement, the feeding phases of the paired vertical plate antennas 10a, 10b and 10c, 10d are inverted, and are inverted again at the time of synthesis to be the same phase and then synthesized. .

  FIG. 12 is a perspective view showing an installation example of the antenna device according to the present embodiment. This example shows a case where the antenna device is installed on the wall surface, and the first reflecting plate 11c is fixed to the wall surface by screwing using the wall surface mounting bracket 7b. Reference numeral 8b denotes a cover, and 9b denotes an input / output unit.

  Since it is such a structure, the total of the conductor length in the horizontal direction of the 2nd reflecting plate 15a of each vertical plate-shaped antenna 10a-10d and the antenna element 15b is 0.3 lambda or less similarly to the said 8th Embodiment. Therefore, when arranging two pairs of magnetic field plane stacked vertical plate antennas 10a, 10b and 10c, 10d, the antenna device is maintained while maintaining the isolation between the antenna pairs. The size can be reduced.

[Tenth embodiment]
13 and 14 show the overall configuration of an antenna device according to a tenth embodiment of the present invention. FIG. 13 is a perspective view seen from obliquely above, and FIG. 14 is a perspective view seen from obliquely below. is there. FIG. 15A is a plan view of the antenna device, and FIGS. 15B to 15E are side views when viewed from four different directions. In the figure, the same parts as those in FIGS. 10 and 12 will be described with the same reference numerals.

  In the antenna device according to the present embodiment, a pair of vertical plate antennas 10a and 10b stacked in a magnetic field plane and a pair of vertical plate antennas 10c and 10d2 stacked in a magnetic field plane on the first reflector 11d. Are arranged with their directions different from each other by 90 degrees. Each of the pairs 10a, 10b and 10c, 10d of the vertical plate antennas is arranged such that the surfaces on which the second reflector 15a and the antenna element 15b are formed face the same direction.

Further, the horizontal plate is supported by the support member 22 with respect to the first reflecting plate 11d at a position above the vertical plate antennas 10a, 10b and 10c, 10d (forward in FIGS. 13 and 14). The antenna 20 is arranged. This horizontal plate-like antenna 20 is arranged in a state where two pairs of horizontal plate-like elements 21a and 21b having a blade shape are crossed, that is, in a state where their directions are different from each other by 90 degrees. The arrangement positions of the elements 21a and 21b are vertically above the vertical plate antennas 10a, 10b and 10c and 10d, that is, the vertical plate antennas 10a to 10d are hidden under the horizontal plate elements 21a and 21b. Is set.
The horizontal plate-shaped element 21a is composed of a pair of symmetrical blade-like plates, and has a feeding point near the center of symmetry (where the pair of plates are closest).
In the figure, 7c is a wall mounting bracket, 8c is a cover, 9b is an input / output unit, and 23a and 23b are power supply cables.

  By the way, the vertical plate antennas 10a, 10b and 10c, 10d have a frequency band of 2400 to 2500 MHz (high frequency band) as a resonance band, and the horizontal plate antenna 20 has a frequency band of 700 to 2200 MHz (low frequency band). The resonance band.

For this purpose, first, for the vertical plate antennas 10a to 10d, when the wavelength corresponding to the upper frequency (2200 MHz) of the low frequency band is λ _B , the horizontal direction of the second reflector 15a and the antenna element 15b Is set so that the total of the conductor lengths becomes 0.3λ _B or less. Further, when the wavelength corresponding to the lower end frequency (2400 MHz) of the high frequency band is λ _C , the arrangement intervals of the vertical plate antenna pairs 10a, 10b and 10c, 10d are all 0.5λ _C. Set to Further, the length from the upper end of the second reflecting plate 15a of the vertical plate-shaped antenna 10a~10d to the bottom end of the slit 15c is set to about 0.25 [lambda _C.

On the other hand, for the horizontal plate antenna 20, when the wavelength corresponding to the lower end frequency (700 MHz) of the low frequency band is λ _A , the conductor length of the horizontal plate elements 21a and 21b is set to 0.35λ _A , The widths of the horizontal plate elements 21a and 21b are set to 0.3 to 0.4λ _C with respect to the wavelength λ _C corresponding to the lower end frequency (2400 MHz) of the high frequency band. Furthermore, the vertical interval between the first reflecting plate 11d and the horizontal plate antenna 20 is usually selected to be ¼ wavelength at any frequency in the low frequency band. For example, when λ _A is used as a reference, it is expressed as 0.15λ _A. The vertical arrangement position of the horizontal plate antenna 20 with respect to the first reflecting plate 11d is about 0.5λ _C (0.3 mm) with respect to the wavelength λ _C corresponding to the lower end frequency (2400 MHz) of the high frequency band. ~ 0.7λ _C ) may be set.

  With such a configuration, the directivity is different by 90 degrees with respect to the high frequency band (2400 to 2500 MHz) by the pair of vertical plate antennas 10a, 10b and 10c, 10d stacked in the magnetic field plane. A polarized wave in a direction parallel to the first reflecting plate 11c is generated. At the same time, with respect to the low frequency band (700 to 2200 MHz), the horizontal plate elements 21a and 21b of the horizontal plate antenna 20 are parallel to the first reflector 11c in directions in which the directivities are different by 90 degrees. Directional polarization is generated.

At that time, in the vertical plate antennas 10a, 10b and 10c, 10d, the total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is 0.3λ _B or less, that is, a low frequency range. The frequency band (700 to 2200 MHz) is set to be shorter than the wavelength corresponding to the upper end frequency of 2200 MHz. For this reason, it is possible to prevent the vertical plate antennas 10a, 10b and 10c, 10d from resonating with respect to the low frequency band (700 to 2200 MHz). That is, it is possible to sufficiently secure isolation between the vertical plate antennas 10a, 10b and 10c, 10d and the horizontal plate elements 21a, 21b of the horizontal plate antenna 20, and thereby the high frequency band. An antenna device that shares (2400 to 2500 MHz) and a low frequency band (700 to 2200 MHz) can be provided.

In addition, the length from the upper end of the second reflecting plate 15a of the vertical plate antennas 10a to 10d to the bottom end of the slit 15c, that is, the height of the vertical plate antennas 10a to 10d is set to about 0.25λ _C. ing. That is, for a distance 0.5 [lambda _C from the first reflector 11d to a horizontal plate-shaped antenna 20 is set to about 1/2. As a result, the horizontal plate elements 21a and 21b of the horizontal plate antenna 20 can function as the directors of the vertical plate antennas 10a to 10d, thereby improving the gain for the high frequency band. it can.

[Eleventh embodiment]
FIG. 16 is a perspective view of an antenna device according to an eleventh embodiment of the present invention as viewed obliquely from above, and FIGS. 17 and 18 are a plan view and a side view, respectively.

  The antenna device according to the present embodiment includes a first reflector 30 that is substantially square. The first reflecting plate 30 is made of a metal conductor, and is manufactured using sheet metal, for example. A horizontal plate antenna 40 is disposed at a vertically upper position in the center of the first reflecting plate 30. As shown in FIG. 17, the horizontal plate antenna 40 has two pairs of horizontal plate elements 41a and 41b having a blade shape. These horizontal plate-like elements 41a and 41b are arranged so as to cross each other, that is, in a state in which the directions are different from each other by 90 degrees and are deviated by 45 degrees with respect to the four sides of the first reflecting plate 30. The

  The horizontal plate elements 41a and 41b are fixedly supported on the first reflecting plate 30 by using two support members 42 and 43 for each of the left and right element pieces. 24 and 25 are exploded perspective views showing the support structure. As shown in the drawing, one of the support members 42 and 43 is made of a hexagonal column made of resin, and the other 43 is made of a metal member bent by sheet metal. The metal support member 43 may be formed by cutting out a part of the first reflector 30 and starting up. If comprised in this way, the number of parts of the supporting member 43 can be reduced and it can further be made cheap.

  In addition, first auxiliary reflecting plates 31 a and 31 b are erected at four corners on the first reflecting plate 30. The first auxiliary reflectors 31a and 31b are formed by bending a metal conductor such as a sheet metal into an L shape, and are arranged so that the bent inner surface faces the tip of the horizontal plate elements 41a and 41b. The The first auxiliary reflectors 31a and 31b are set to the same potential as the first reflector 30 in terms of DC. The first auxiliary reflectors 31a and 31b maintain a good impedance even in a frequency band (low frequency band) in which the distance between the first reflector 30 and the first reflector 30 is narrow with respect to the wavelength.

  Furthermore, second auxiliary reflectors 32a to 32d are installed on the four sides of the first reflector 30 in parallel with the sides. The second auxiliary reflecting plates 32a to 32d are formed by bending a metal conductor such as a sheet metal, and two of the second auxiliary reflecting plates 32a to 32d are arranged side by side on each side. Note that these two reflectors may be integrally formed as one reflector. The second auxiliary reflectors 32a to 32d are also set to the same potential as the first reflector 30 in terms of DC.

  By the way, specific dimensions of the first reflector 30, the horizontal plate elements 41a and 41b, the first auxiliary reflectors 31a and 31b, and the second auxiliary reflectors 32a to 32d are set as follows, for example. Is done. That is, when a frequency band of 700 to 2200 MHz (low frequency band) is used as a resonance band now, assuming that the wavelength corresponding to the lower end frequency is λ, as shown in FIGS. 17 and 18, the horizontal plate element 41a , 41b is set to have a conductor length of 0.36λ or less and a width of 0.1λ or less. Further, the width of one piece of the first auxiliary reflectors 31a and 31b is set to 0.08λ or less, the width of the second auxiliary reflectors 32a to 32d is set to 0.49λ or less, and the first reflector 30 is further set. Is set to 0.54λ or less.

  Further, the distances, that is, the heights of the horizontal plate elements 41a and 41b from the first reflecting plate 30 are set to 0.16λ or less and 0.15λ or less, respectively. Further, the height of the first auxiliary reflectors 31a and 31b is set to 0.14λ or less, and the height of the second auxiliary reflectors 32a to 32d is set to 0.08λ or less.

  In the antenna device according to the present embodiment, a director 50 is further mounted on the horizontal plate antenna 40. FIG. 19 is a perspective view showing a state in which the director 50 is mounted, and FIGS. 20 and 21 are a plan view and a side view, respectively. As shown in the figure, the director 50 is fixed to the first reflector 30 by a support member.

  The director 50 has an insulating substrate 51 having a substantially square shape, and first parasitic elements 52a and 52b are arranged on the surface side of the insulating substrate 51 as shown in FIG. Further, second parasitic elements 53a to 53d are arranged on the rear surface side as shown in FIG.

  The first parasitic elements 52a and 52b are composed of four conductive patterns, and are positioned so that these conductive patterns face the horizontal plate elements 41a and 41b described above. Each conductive pattern is provided with a plurality of slits forming a rectangle as shown in FIG. The length and width of each conductive pattern are set to 0.11λ and 0.05λ, respectively, where λ is the wavelength corresponding to the lower end frequency of the low frequency band (700 to 2200 MHz) that is the resonance band.

  The second parasitic elements 53a to 53d are formed by arranging a plurality of linear conductive patterns in stripes at regular intervals, as shown in FIG. 23, at positions facing the horizontal plate elements 41a and 41b. The length and arrangement interval of the on-line conductive patterns are set to 0.09λ and 0.04λ, respectively.

  Because of such a configuration, the horizontal plate elements 41a and 41b generate two systems of polarized waves having directivity in directions different by 90 degrees with respect to the low frequency band (700 to 2200 MHz). All of these polarized waves are polarized in a direction parallel to the first reflecting plate 30.

  At that time, the first auxiliary reflectors 31a and 31b and the second auxiliary reflectors 32a to 32d are installed, so that the directivity of each of the two systems of polarized waves can be further enhanced. Furthermore, the standing wave ratio characteristic in the low frequency band can be improved by installing the waveguide 50 including the first and second parasitic elements 52a, 52b and 53a, 53b.

[Twelfth embodiment]
In the antenna device according to the twelfth embodiment of the present invention, vertical plate antennas 60a to 60d having a frequency band of 2400 to 2500 MHz (high frequency band) as resonance bands on the first reflector 30 and 700 A horizontal plate antenna 40 having a resonance band in a frequency band (low frequency band) of 2200 MHz, and first and second auxiliary reflectors 31a, 31b and 32a acting on the directivity of the horizontal plate antenna 20 32d and a director 50 are provided.

  First, vertical plate antennas 60 a to 60 d are mounted on the first reflector 30. FIG. 26 is a perspective view of the state in which the vertical plate antennas 60a to 60d are mounted as viewed obliquely from above, and FIGS. 27 and 28 are a plan view and a side view, respectively.

  The vertical plate-shaped antennas 60a to 60d have the antennas 60a and 60b and the antennas 60c and 60d, respectively, which are paired and have their directions different from each other by 90 degrees, and as shown in FIG. It is arranged in a state where it is deviated by 45 degrees with respect to the four sides. These pairs of vertical plate antennas 60a, 60b and 60c, 60d are arranged in parallel so as to face each other at a predetermined interval, thereby forming a magnetic field surface stack.

  29 and 30 are enlarged views of the configuration of the vertical plate antennas 60a to 60d. In the figure, the same parts as those in FIG.

  The vertical plate-like antennas 60a to 60d are formed on one surface of the insulating substrate 16 with a rectangular first conductive pattern constituting the second reflector 15a and an L-type second conductive pattern constituting the antenna element 15b. Is forming. A slit 15c is formed between the first conductive pattern and the second conductive pattern, leaving a part of the lower end thereof, thereby forming a bypass circuit.

The dimensions of the patterns are set as follows, for example. That is, when the wavelength corresponding to the lower end frequency (2400 MHz) of the high frequency band (2400 to 2500 MHz) is λ _H , the horizontal length of the second reflector 15a and the antenna element 15b in the drawing is 0.3λ _H. hereinafter, the length of the upper end portion of the second reflecting plate 15a and the antenna element 15b is set below 0.15Ramuda _H respectively. The horizontal direction of the length of the vertical plate antenna 60a~60d is set below 0.45λ _H. Vertical size of the vertical plate-shaped antenna 60a~60d, the length of the conductive pattern is below 0.31Ramuda _H, also the overall length is set to the following 0.32λ _H.

  On the other hand, a microstrip line 15h with a stub is formed on the other surface of the insulating substrate 16 so as to be back to back with respect to the first conductive pattern constituting the second reflecting plate 15a. The microstrip line portion of the stub-attached microstrip line 15h is used as a part of the feeding path, and the stub portion is used as an open stub or a short stub for impedance matching.

The dimensions of the microstrip line 15h with stubs are set such that the vertical direction of the microstrip line part is 0.24λ _H and the horizontal direction is 0.07λ _H , respectively, as shown in FIG. There is set to 0.23λ _H.

  The vertical plate antennas 10a, 10b and 10c, 10d are oriented so that the second reflector 15a and the antenna element 15b formed on one surface thereof face in opposite directions (outward directions). . That is, the vertical plate antennas 10a, 10b and 10c, 10d are mechanically centered on the first reflector 30 so that the surfaces on which the second reflector 15a and the antenna element 15b are provided are in opposite phases. Are arranged so as to be rotationally symmetric. Then, between the vertical plate antennas 10a, 10b and 10c, 10d, the radio signals output from the respective radio circuits are synthesized by an antiphase distributor, and finally the second reflector 15a and the antenna element 15 are combined. Therefore, they are synthesized in the same phase.

  A horizontal plate antenna 40 is mounted above the vertical plate antennas 60a to 60d. FIG. 31 is a perspective view of the state in which the horizontal plate antenna 40 is mounted as viewed obliquely from above, FIG. 32 is a plan view thereof, and FIG. 33 is a side view thereof. In FIGS. 31 to 33, the same parts as those in FIGS.

  The horizontal plate antenna 40 has two pairs of horizontal plate elements 41a and 41b having a blade shape. These horizontal plate-like elements 41a and 41b have substantially the same shape, and maintain a state in which their polarization directions are different from each other by 90 degrees, as shown in FIG. The reflector plate 30 is arranged in a state of being deviated by 45 degrees with respect to the four sides of the reflector plate 30. At this time, the vertical plate antennas 60a and 60b are sandwiched between the horizontal plate element 41a and the first reflector 30, and the vertical plate antennas 60c and 60d are connected to the horizontal plate element 41b and the first reflector. The horizontal plate-like element 41 and the vertical plate-like antenna 60 sandwiched between 30 and having such a relationship are orthogonal to each other in polarization. In the present embodiment, the horizontal plate elements 41a and 41b are slightly different in distance from the first reflecting plate for convenience of arrangement so as to cross each other.

  As in the tenth embodiment, the horizontal plate element 41a has a feeding point at a position where the left and right element pieces are closest to each other, and is fed from the feeding line substrate 44 as shown in FIGS. The The feeder line substrate 44 uses a substrate having a pattern on both sides as a balanced line having a predetermined characteristic impedance, and the pattern on each surface is connected to the left and right element pieces, respectively.

  The horizontal plate-like element 41a is fixedly supported on the first reflecting plate 30 using a resin support member 42 and a metal support member 43 for each of the left and right element pieces. The support member 43 is connected to a portion near the feeding point of each element piece of the horizontal plate-like element 41a, functions as a part of a short stub or a balun, and contributes to broadband impedance matching.

  In addition, first auxiliary reflecting plates 31 a and 31 b are erected at four corners on the first reflecting plate 30. The first auxiliary reflectors 31a and 31b are formed by bending a metal conductor such as a sheet metal into an L shape, and are arranged so that the bent inner surface faces the tip of the horizontal plate elements 41a and 41b. The The first auxiliary reflectors 31a and 31b are set to the same potential as the first reflector 30 in terms of DC.

  Furthermore, second auxiliary reflectors 32a to 32d are installed on the four sides of the first reflector 30 in parallel with the sides. The second auxiliary reflecting plates 32a to 32d are formed by bending a metal conductor such as a sheet metal, and two of the second auxiliary reflecting plates 32a to 32d are arranged side by side on each side. The second auxiliary reflectors 32a to 32d are also set to the same potential as the first reflector 30 in terms of DC. Note that the two reflecting plates arranged side by side along the one side may be integrally formed as one reflecting plate.

By the way, specific dimensions of the first reflector 30, the horizontal plate elements 41a and 41b, the first auxiliary reflectors 31a and 31b, and the second auxiliary reflectors 32a to 32d are set as follows, for example. Is done. That is, when the frequency band (low frequency band) of 700 to 2200 MHz is the resonance band of the horizontal plate antenna 40, assuming that the wavelength corresponding to the lower end frequency is λ _L , as shown in FIGS. , horizontal plate-shaped element 41a, the conductor length of 41b 0.36λ _L or less, to set the width below 0.1 [lambda] _L. Incidentally, as shown in FIG. 17, the first auxiliary reflector 31a, the width of 31b piece is below 0.08Ramuda _L, the width of the second auxiliary reflector 32a~32d each below 0.49Ramuda _L is set, further the length of the first side of the reflecting plate 30 is set below 0.54λ _L.

The horizontal plate-shaped element 41a of the first reflector 30, as shown in FIG. 33, the distance 41b, that is, the height is set below each 0.16Ramuda _L or less and 0.15λ _L. The first auxiliary reflector 31a, as shown in FIG. 18, the height of 31b is below 0.14Ramuda _L, also the height of the second auxiliary reflector 32a~32d each below 0.08Ramuda _L Is set.

  Furthermore, in the antenna device according to the present embodiment, the director 50 is mounted on the upper part of the horizontal plate antenna 40. FIG. 34 is a perspective view of the state where the director 50 is mounted as viewed obliquely from above, FIG. 35 is a plan view thereof, and FIG. 36 is a side view thereof. In FIG. 34 to FIG. 36, the same parts as those in FIG. 19 to FIG.

The director 50 has an insulating substrate 51 having a substantially square shape, and first parasitic elements 52a and 52b are arranged on the surface side of the insulating substrate 51 as shown in FIG. Further, second parasitic elements 53a to 53d are arranged on the rear surface side as shown in FIG. The director 50 is fixed to the first reflector 30 by a support member. The distance from the first reflector 30 to the director 50, that is, the height direction position of the director 50 is set to 0.18λ _L as shown in FIG.

The first parasitic elements 52a and 52b are composed of four conductive patterns, and are positioned so that these conductive patterns face the horizontal plate elements 41a and 41b described above. Each conductive pattern is provided with a plurality of slits forming a rectangle as shown in FIG. The length and width of each conductive pattern are set to 0.11λ _L and 0.05λ _L , respectively, where λ _L is the wavelength corresponding to the lower end frequency of the low frequency band (700 to 2200 MHz) that is the resonance band. Yes.

  The second parasitic elements 53a to 53d are formed by arranging a plurality of linear conductive patterns in stripes at regular intervals, as shown in FIG. 23, at positions facing the horizontal plate elements 41a and 41b. The length and arrangement interval of the on-line conductive patterns are set to 0.09λ and 0.04λ, respectively.

  Because of such a configuration, the horizontal plate elements 41a and 41b generate two systems of polarized waves having directivity in directions different by 90 degrees with respect to the low frequency band (700 to 2200 MHz). All of these polarized waves are polarized in a direction parallel to the first reflecting plate 30.

  At that time, the first auxiliary reflectors 31a and 31b and the second auxiliary reflectors 32a to 32d are installed, so that the directivity of each of the two systems of polarized waves can be further enhanced. Furthermore, the standing wave ratio characteristic can be improved by installing the waveguide 50 including the first and second parasitic elements 52a, 52b and 53a, 53b.

  On the other hand, the pair of vertical plate antennas 60a, 60b and 60c, 60d stacked in the magnetic field plane has two systems of polarization having directivity in directions different by 90 degrees with respect to the high frequency band (2400 to 2500 MHz). A wave is generated. All of these polarized waves are polarized in a direction parallel to the first reflecting plate 30.

At this time, in the vertical plate antennas 60a, 60b and 60c, 60d, the total conductor length in the horizontal direction of the second reflector 15a and the antenna element 15b is 0.3λ _L or less, that is, the low frequency range It is set to be shorter than the wavelength λ _L corresponding to the upper end frequency 2200 MHz of the band (700 to 2200 MHz). For this reason, it is possible to prevent the vertical plate antennas 60a, 60b and 60c, 60d from resonating with respect to the low frequency band (700 to 2200 MHz). As a result, sufficient isolation can be ensured between the vertical plate antennas 60a, 60b and 60c, 60d and the horizontal plate elements 41a, 41b of the horizontal plate antenna 40. An antenna device that shares a band (2400 to 2500 MHz) and a low frequency band (700 to 2200 MHz) can be provided.

  That is, the horizontal plate antenna 40 that is a low-band ultra-wideband antenna that can obtain a specific band characteristic of 98% or more, and the vertical plate antennas 60a to 60d that are high-frequency band antennas that can obtain a band characteristic of 19% or more. By combining with, it is easy to realize a shared antenna that can handle a wide band including three bands, without arranging the elements of the low-frequency ultra-wideband antenna and the elements of the high-frequency band antenna for each frequency band. Can do. In addition, the cost can be reduced by simplifying the structure, and each frequency band can be divided into two systems to provide an antenna device that supports MIMO. Furthermore, it is possible to provide an antenna device that reduces the ripple of the antenna gain frequency characteristic and improves the isolation between the antenna elements.

[Other Embodiments]
In the above embodiment, the case where the antenna device is installed on the wall surface has been described as an example. However, the antenna device may be installed on a horizontal surface such as a table surface or a ceiling. In addition, the shape and size of the elements of the vertical plate antenna and the horizontal plate antenna, the structure of the power supply path to each element, and the like can be variously modified without departing from the scope of the present invention.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  E ... detour circuit, F ... feeding point, G ... feeding cable connection end, 7a-7c ... wall mounting bracket, 8a-8c ... cover, 9a, 9b ... input / output unit, 10a-10d, 60a-60d ... vertical plate shape Antennas 11, 11a to 11d, 30 ... first reflector, 12, 15a ... second reflector, 13, 15b ... element, 15c ... slit, 15d, 15e, 15f ... microstrip line, 16 ... insulating substrate , 18a to 18d, 23a, 23b ... feeder cable, 19 ... mixer, 20, 40 ... horizontal plate antenna, 21a, 21b, 41a, 41b ... horizontal plate element, 22, 42, 43 ... support member, 31a, 31b ... 1st auxiliary reflecting plate, 32a-32d ... 2nd auxiliary reflecting plate, 44 ... Feed line substrate, 50 ... Waveguide, 51 ... Insulating plate, 52a, 52b, 53a, 53b ... Parasitic element.

Claims (6)

A first reflector having conductivity;
A second reflector that is erected vertically to the first reflector and set to the same potential as the first reflector;
It arrange | positions so that it may extend | stretch in parallel with a said 1st reflecting plate from the front-end | tip part of the one side edge of a said 2nd reflecting plate through an insulation part, and it cooperates with a said 2nd reflecting plate and a said 1st reflection An element that forms polarized waves in a direction parallel to the plate ,
The second reflecting plate and the element are constituted by first and second conductive patterns formed on one surface of the insulating substrate, respectively.
An antenna device , wherein a feeding microstrip line is formed on the other surface of the insulating substrate so as to be back to back with the first conductive pattern constituting the second reflecting plate . A first reflector having conductivity;
A first antenna having a first element arranged in parallel with the first reflector and having a first frequency band as a resonance band;
A second antenna disposed between the first reflector and the first antenna and having a second frequency band higher than the first frequency band as a resonance band;
The second antenna is
A second reflector that is erected vertically to the first reflector and set to the same potential as the first reflector;
It arrange | positions so that it may extend | stretch in parallel with a said 1st reflecting plate from the front-end | tip part of the one side edge of the said 2nd reflecting plate through an insulation part, and it cooperates with a said 2nd reflecting plate and a said 1st reflection A second element that forms a polarization in a direction parallel to the plate,
And when the wavelength corresponding to the upper end frequency of the first frequency band is λ _B , the second antenna has a total length in the polarization direction of the second reflector and the second element, An antenna device, wherein the antenna device is set to about 0.3λ _B or less. The second antenna is the sum of the length, the according to claim 2, characterized in that it is set to a width shorter than the length of the second placed first element on the antenna Antenna device. When the wavelength corresponding to the lower end frequency of the second frequency band is λ _C , the first antenna is disposed at a position spaced apart from the first reflector by about 0.5λ _{C in the} vertical direction,
4. The antenna device according to claim 2 , wherein the second antenna is configured such that a conductor length in a vertical direction of the second reflector is approximately 0.25λ _{C. 5} . The antenna device according to claim 2 , wherein the first antenna is supported by a metal conductor erected on the first reflecting plate. A first reflector having conductivity;
A first antenna having a first element arranged in parallel with the first reflector and having a first frequency band as a resonance band;
A second antenna disposed between the first reflector and the first antenna and having a second frequency band higher than the first frequency band as a resonance band;
A first parasitic element acting on the first frequency band and a second parasitic element acting on the second frequency band are arranged at positions opposite to the first reflector of the first antenna. Comprising a parasitic element with a parasitic element,
The second antenna is
A second reflector that is erected vertically to the first reflector and set to the same potential as the first reflector;
It arrange | positions so that it may extend | stretch in parallel with a said 1st reflecting plate from the front-end | tip part of the one side edge of the said 2nd reflecting plate through an insulation part, and it cooperates with a said 2nd reflecting plate and a said 1st reflection An antenna device comprising: a second element that forms a polarized wave in a direction parallel to the plate.