JPH06260834A - Antenna device - Google Patents

Abstract

PURPOSE:To give desired exciting amplitude phase distribution on a radial hole by providing a waveguide for feed at a parallel plate by using a plated through hole or groove, and making a plane wave whose wave front is arranged advance a radial part setting the aperture part of the waveguide as a wave source by confronting with a reflecting wall. CONSTITUTION:A wave from a feed point 2 is propagated in the waveguide 3a in a proper mode. The wave is propagated as a semi-cylindrical wave advancing the reflecting wall 4 from the aperture of the waveguide 3a centering about the aperture. Phases are arranged at the aperture of the waveguide 3a, and the semicylindrical wave whose wave front can be arranged more uniformly can be obtained. Also, since no electric field exists on the plane of the through hole or the groove in the waveguide 3a, scattering at an aperture terminal can be suppressed to a minimum. In such a way, since the semi-cylindrical wave with low scattering and whose wave front is arranged is reflected on a reflector 4, the plane wave whose wave front is arranged advances the radial part 6, which supplies a desired exciting phase to each radial pore 5. Also, the same operation can be performed even by constituting the waveguide 3b for feed of the plated groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding type antenna device for propagating radio waves between two parallel plate conductors.

[0002]

2. Description of the Related Art FIG. 17 shows the 1981 IEEE AP-
S Symposium Digest VolIp
p. It is a front view of the antenna device shown by 207-208. Reference numeral 1 is a dielectric substrate whose entire surface is covered with a conductor film, 2 is a feeding point, 4 is a parabolic reflection wall whose focal point is the feeding point, and 5
Is a radiating hole formed by etching a conductor, 6 is a radiating portion in which a plurality of radiating holes 5 are arranged, 7 is a plated through hole, and is a semi-circular reflector centered on the feeding point 1, 8 Is the traveling direction of the radio wave. The radiation holes 5 are arranged in a square array at intervals s = λg (λg: wavelength in the parallel plate) in the traveling direction 8 of the radio wave in the radiation portion 6 and at intervals d in the direction perpendicular to the traveling direction 8 of the radio wave. Further, the radiation hole 5 in this conventional example is a slot, and its plane of polarization is parallel to the traveling direction 8 of the radio wave in the radiation section 6. The antenna device shown in FIG. 17 is constructed by integrating all of the surfaces except the radiation hole 5 in a dielectric substrate covered with a conductor. The thickness of the dielectric substrate is smaller than 1/2 of the in-dielectric wavelength of the radio wave used, and the entire dielectric substrate is like a parallel plate waveguide.

Next, the operation will be described. The electric wave fed from the feeding point 2 propagates in a cylindrical shape. Of these, what propagates to the semicircular reflector 7 returns to the feeding point 1 reflected by the semicircular reflector 7 and propagates to the reflection wall 4 this time. Since the radius of the semicircular reflector 7 is λg / 4 (λg: wavelength in the parallel plate), the radio wave returning to the feeding point 2 is delayed in phase by exactly 2π. Therefore, the radio wave has the same phase as the radio wave propagated to the reflection wall 4 from the beginning. Eventually, all the radio waves emitted from the feeding point 2 become semi-cylindrical waves centering on the feeding point 2 and propagate toward the reflection wall 4. This semi-cylindrical wave is reflected by the reflection wall 4, then becomes a plane wave, travels to the radiating section 6, and excites a plurality of radiating holes 5 on the way. The plurality of radiation holes 5 are arranged at intervals of λg with respect to the traveling direction of the plane wave, and all the radiation holes are excited in the same phase. Therefore, in the antenna device of this conventional example, a beam is formed in a direction perpendicular to the parallel plate. The polarization of the formed beam is a linear polarization having the same plane of polarization as the radiation hole 5. The length of the radiation hole 5 increases as the plane wave travels.
This is because the plane wave attenuated by the radiation is more strongly coupled to the space and the electric power radiated from each radiation hole 5 is equalized. As a result, the aperture amplitude distribution of the present antenna device becomes uniform and the gain becomes high.

[0004]

The conventional antenna device has been constructed as described above. However, in this type of antenna device, since the semi-circular reflector 7 has a size of only about the wavelength, the behavior of the radio wave from the feeding point 2 toward the semi-circular reflector 7 is as described above. It becomes a complex scattered wave rather than a strange one. Therefore, the radio wave propagating from the feeding point 2 to the reflection wall 4 does not become a semi-cylindrical wave with a uniform wavefront, and therefore the radio wave reflected by the reflection wall 4 does not become a plane wave with a uniform wavefront. A strong diffracted wave generated at the end of the semi-circular reflector 7 travels directly to the radiation section 6 without passing through the reflection wall 4. For these reasons, in the conventional antenna device, it is difficult to propagate a plane wave having a uniform wavefront in the radiation section 6, and thus it is difficult to provide the radiation hole 5 with a desired excitation amplitude / phase distribution. there were.

The present invention has been made in order to solve the above-mentioned problems, and an antenna capable of imparting a desired excitation amplitude / phase distribution to a radiation hole by advancing a plane wave having a uniform wavefront to a radiation portion. The purpose is to get the device. Furthermore, an antenna device with a smaller physical area, an antenna device that has a built-in oscillator and does not require connection to an external oscillator, and an antenna device that has a simple structure for connection to an external power supply line such as a microstrip line or a waveguide, Antenna device with improved reflection from the reflection wall to the feeding waveguide, antenna device with improved loss inside the antenna, antenna device with improved influence of scattering within the antenna, antenna with uniform aperture amplitude distribution Device, antenna device with wide frequency band,
Another object of the present invention is to provide an antenna device that is mounted on a moving body and measures more accurately when measuring the speed of the moving body.

[0006]

According to a first aspect of the present invention, there is provided an antenna device in which a plurality of radiation holes are provided on one surface of a parallel plate conductor having a dielectric member interposed therebetween, and the inside of the parallel plate. In an antenna device having a reflection wall having a cylindrical parabolic wall and a wave source provided at the focal point of the reflection wall, a feeding waveguide is provided in the parallel flat plate by a plated through hole or groove. The wave source is formed by making the opening of the power feeding waveguide face the reflection wall.

According to a second aspect of the present invention, there is provided an antenna device, wherein a parallel plate conductor having a dielectric body sandwiched between the parallel plate conductors has a plurality of radiation holes formed on one surface thereof, and the parallel plate conductor is connected between the radiation parts. In the antenna device provided with a power feeding section for propagating a plane wave, the power feeding section is configured by providing a distributor with plated through holes or grooves in the parallel plate.

According to a third aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the reflection member. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the wall so as to face the reflection wall, a portion other than the radiation portion is a boundary with the radiation portion. Then, the radiating portion is folded on the side where there is no radiating hole.

According to a fourth aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflection wall having a parabolic cylindrical busbar and a reflection wall. An antenna device comprising a feed waveguide in the parallel plate having an opening provided on the focal point of the wall so as to face the reflection wall, wherein an oscillation element is incorporated in the feed waveguide. is there.

According to a fifth aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflecting wall having a parabolic cylindrical busbar provided in the parallel plate, and the reflecting member. In an antenna device composed of a feeding waveguide in the parallel plate in which an opening is provided on the focal point of the wall so as to face the reflection wall, a plane on the parallel plate conductor side of the feeding waveguide is provided. A coupling hole is provided to electromagnetically couple a feeding circuit such as an external microstrip line or a waveguide with the feeding waveguide.

According to a sixth aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflection wall having a parabolic cylindrical busbar and a reflection wall. In an antenna device composed of a feed waveguide in the parallel plate having an opening provided on the focal point of the wall so as to face the reflection wall, a corner waveguide is used as the feed waveguide. It is built into a flat conductor.

According to a seventh aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflecting wall having a parabolic cylindrical busbar provided in the parallel plate, and the reflecting member. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the wall so as to face the reflecting wall, a portion of the reflecting wall facing the feeding waveguide. It is provided with a protrusion for impedance matching.

According to an eighth aspect of the present invention, there is provided an antenna device in which a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflection wall having a parabolic cylindrical busbar in the parallel plate, and the reflection member. In an antenna device composed of a feed waveguide in the parallel plate having an opening provided on the focal point of the wall so as to face the reflection wall, a dielectric is filled in the parallel plate conductor of the radiating section. , A layer of a dielectric having a dielectric constant different from that of the dielectric is provided at the connecting portion between the radiating part and the other part, and the other part in the parallel plate is filled with nothing. It does not.

According to a ninth aspect of the present invention, there is provided an antenna device, wherein a parallel plate conductor is provided with a plurality of radiation holes on one surface thereof, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the reflection member. In an antenna device composed of a feed waveguide in the parallel plate provided with an opening so as to face the reflection wall on the focal point of the wall, a dielectric is filled in the parallel plate of the radiating portion, At the connecting portion between the radiating portion and the other portion, the thickness of the dielectric is gradually reduced as the distance from the radiating portion increases, and nothing is filled in the other portion in the parallel plate.

An antenna device according to a tenth aspect of the present invention is a radiating portion having a plurality of radiating holes formed on one surface of a parallel plate conductor having a dielectric material sandwiched between the radiating portion and the radiating portion connected between the parallel plate conductors. In an antenna device having a feeding section for propagating a plane wave, the arrangement interval of the radiation holes in the direction orthogonal to the traveling direction of the plane wave is set to be equal to or less than the wavelength in the parallel plate conductor.

An antenna device according to an eleventh aspect of the present invention is a radiating portion in which a plurality of radiating holes are provided on one surface of a parallel plate conductor, and a feeding portion connected to the radiating portion for propagating a plane wave between the parallel plate conductors. In the antenna device including, the number of the radiation holes arranged in the direction orthogonal to the traveling direction of the plane wave is increased in the traveling direction of the plane wave.

An antenna device according to a twelfth aspect of the present invention is a radiating portion in which a plurality of radiating holes are provided on one surface of a parallel plate conductor, and a feeding portion connected to the radiating portion for propagating a plane wave between the parallel plate conductors. In the antenna device including the above, a minute hole that is extremely smaller than the wavelength is used as a radiation hole, and the size of the minute hole is gradually increased in the traveling direction of the plane wave.

An antenna apparatus according to a thirteenth aspect of the present invention is a radiating portion having a plurality of radiating holes formed on one surface of a parallel plate conductor, and a feeding portion connected to the radiating portion for propagating a plane wave between the parallel plate conductors. In the antenna device provided with, an elliptical or circular radiation hole is used.

According to a fourteenth aspect of the present invention, there is provided an antenna device according to a fourteenth aspect, wherein a parallel plate conductor has a plurality of radiation holes formed on one surface of the parallel plate conductor, and the parallel plate has a parabolic cylindrical reflection wall.
And an antenna device constituted by a feed waveguide in the parallel plate having an opening provided on the focal point of the reflection wall so as to face the reflection wall, in the end face of the parallel plate conductor of the radiation part. It is equipped with a radio wave absorber.

According to a fifteenth aspect of the present invention, in the antenna device, a parallel plate conductor has two conductors having a plurality of radiation holes formed on one surface of the conductor, and a radiation part connected to the radiation part. In the antenna device used for measuring the speed of the moving body, which is equipped with a power feeding unit for propagating a plane wave in the moving body, the antenna device is installed on the front bottom surface of the moving body,
Further, the beam direction of the antenna device is tilted rearward of the moving body.

According to a sixteenth aspect of the present invention, there is provided an antenna device, wherein two conductors forming a parallel plate conductor are provided with a plurality of radiation holes on one surface, and a radiation part connected to the radiation part is provided between the parallel plate conductors. An antenna device equipped with a power feeding unit for propagating a plane wave and used for speed measurement of a moving body when mounted on a moving body, the antenna device is installed on the bottom surface of the moving body, and power is fed from both sides of the parallel plate conductor. The radiation hole is provided so as to form a beam in two directions in front of and behind the moving body.

[0022]

According to the first aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor having a dielectric material sandwiched between the radiation portion, and a busbar provided in the parallel plate has a parabolic cylindrical reflection. In an antenna device composed of a wall and a wave source provided at the focal point of the reflection wall, a power feeding waveguide is provided in the parallel flat plate by a plated through hole or groove, and an opening of the power feeding waveguide is provided. Since the wave source is made to face the reflection wall, a plane wave having a uniform wave front advances to the radiating portion, and a desired excitation amplitude / phase distribution can be provided in the radiating hole.

According to a second aspect of the present invention, there is provided a radiating portion in which a plurality of radiating holes are provided on one surface of a parallel plate conductor having a dielectric material interposed therebetween.
And an antenna device connected to the radiating unit and having a feeding unit for propagating a plane wave between the parallel plate conductors, the feeding unit is configured by providing a distributor with plated through holes or grooves in the parallel plate. Therefore, a plane wave having a uniform wavefront advances to the radiating portion, and a desired excitation amplitude / phase distribution can be provided in the radiating hole.

According to the third aspect of the present invention, the radiation portion in which a plurality of radiation holes are provided on one surface of the parallel plate conductor, the parabolic cylindrical reflection wall provided in the parallel plate, and the reflection wall are formed. In an antenna device configured by a feeding waveguide in the parallel plate provided with an opening so as to face the reflection wall on the focal point, a portion other than the radiation portion, at the boundary with the radiation portion, Since the antenna is folded on the side of the radiation section where there is no radiation hole, the physical area of the antenna device is reduced.

According to a fourth aspect of the present invention, there is provided a radiation portion having a plurality of radiation holes on one surface of the parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall. In an antenna device composed of a feed waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, an oscillation element is incorporated in the feed waveguide. No need to connect with.

According to a fifth aspect of the present invention, a radiation portion having a plurality of radiation holes provided on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabola as a busbar provided in the parallel plate, and the reflection wall. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, a coupling hole is formed in the surface of the feeding waveguide on the parallel plate conductor side. Since the external power supply circuit such as a microstrip line or a waveguide is electromagnetically coupled to the power supply waveguide, the structure for connection with the external power supply line is simplified.

According to a sixth aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, a corner waveguide is used as the feeding waveguide as the parallel plate conductor. Since it is built in, the structure of connection with the external power feeding waveguide becomes simple.

According to a seventh aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflecting wall, impedance at a portion of the reflecting wall facing the feeding waveguide Since the projection for matching is provided, the reflection from the entire reflection wall to the power feeding waveguide is canceled,
The reflection characteristics are improved.

According to an eighth aspect of the present invention, there is provided a radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, a dielectric is filled in the parallel plate of the radiating portion, and the radiation is generated. A layer of a dielectric material having a different dielectric constant from that of the dielectric material is provided at the connecting portion between the other part and the other part so as to be in contact with the dielectric material, and the other parts in the parallel plate should not be filled with anything. Therefore, the section where the radio wave passes through the dielectric in the antenna device is reduced, and the dielectric loss is improved.

According to a ninth aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall are provided. In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, a dielectric is filled in the parallel plate of the radiating portion, and the radiation is generated. Since the thickness of the dielectric is gradually reduced as it goes away from the radiating part at the connection part between the part and other parts, and the other parts in the parallel plate are not filled with anything, the antenna The section where the radio wave passes through the dielectric is reduced in the device, and the dielectric loss is improved.

According to a tenth aspect of the present invention, a plane wave is provided between the parallel plate conductors by connecting the parallel plate conductors with a radiation member having a plurality of radiation holes formed on one surface of a parallel plate conductor with a dielectric material interposed therebetween. In the antenna device provided with a power feeding section for propagating, the arrangement interval of the radiation holes in the direction orthogonal to the traveling direction of the plane wave is set to be equal to or less than the wavelength in the parallel plate conductor, so that the co-phase surface of the scattered wave in the antenna Is less likely to occur and the influence of scattered waves in the antenna is improved.

According to the eleventh aspect of the present invention, there is provided a radiation part having a plurality of radiation holes provided on one surface of the parallel plate conductor, and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. In the antenna device, the number of the radiation holes arranged in the direction orthogonal to the traveling direction of the plane wave,
Since it increases in the traveling direction of the plane wave, the aperture amplitude distribution becomes uniform.

According to a twelfth aspect of the present invention, the parallel plate conductor is provided with a radiation portion having a plurality of radiation holes on one surface thereof, and a feeding portion connected to the radiation portion for propagating a plane wave between the parallel plate conductors. In the antenna device described above, a minute hole that is extremely smaller than the wavelength is used as the radiation hole, and the size of the minute hole is gradually increased in the traveling direction of the plane wave, so that the aperture amplitude distribution becomes uniform. Become.

According to a thirteenth aspect of the present invention, there is provided a radiation part having a plurality of radiation holes provided on one surface of the parallel plate conductor, and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. In addition, since the elliptical or circular radiation holes are used in the antenna device, since the variation of the excitation amplitude is small with respect to the frequency variation in these radiation holes, the antenna device operates stably in a wide frequency band.

According to a fourteenth aspect of the present invention, there is provided a radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate, and the reflection wall. An antenna device comprising an electric power feeding waveguide in the parallel plate having an opening provided on the focal point so as to face the reflection wall, wherein an electromagnetic wave absorber is provided on an end face of the parallel plate conductor of the radiating section. Therefore, the influence of scattering in the antenna is improved.

According to a fifteenth aspect of the present invention, a plane wave is provided between the parallel plate conductors by connecting the two plane conductors forming the parallel plate conductor with a plurality of radiation holes on one surface thereof and the radiation part. In an antenna device equipped with a power feeding section for propagating, and used for speed measurement of a moving body, the antenna device is installed on the front bottom surface of the moving body, and the beam direction of the antenna device is Since it is tilted backward, the influence of tire muddy splashes, rain and snow on the measurement radio waves is reduced, and the speed of the moving body can be measured more accurately.

In the sixteenth aspect of the present invention, a plane portion is provided between the parallel plate conductors by connecting to the radiation part, the radiation part having a plurality of radiation holes formed on one surface of two conductors forming the parallel plate conductor. In an antenna device equipped with a power feeding unit for propagating a magnetic field and used for speed measurement of a moving body, the antenna device is installed on the bottom surface of the moving body, and power is fed from both sides of the parallel plate conductor. Since the radiation holes are provided so as to form the beam in two directions before and after, the measurement data in two directions can be obtained, and by statistically processing the measurement data, the velocity of the moving body can be more accurately measured. Can be measured.

[0038]

EXAMPLES Example 1. FIG. 1 is a front view of an embodiment of the antenna device of the present invention. In FIG. 1A, 1 is a dielectric substrate whose entire surface is covered with conductors except for the radiation holes 5, 2 is a feeding point provided in the dielectric substrate 1, and 3a is a through hole plated in the dielectric substrate 1. It is a waveguide for power supply provided in
The feeding point 2 and the feeding waveguide 3a constitute a coaxial waveguide converter. Reference numeral 4 denotes a parabolic reflection wall whose focal point is the opening of the feeding waveguide 3, 5 is a radiation hole formed by etching a conductor, 6 is a radiation portion in which a plurality of radiation holes 5 are arranged, and 8 is a radiation portion. It is the direction of travel of radio waves. The radiation holes 5 are arranged in a square array at intervals s in the traveling direction 8 of the radio wave and at intervals d in the direction perpendicular to the traveling direction 8 of the radio wave. In the embodiment of FIG. 1, s = λg (λg: wavelength in parallel plate), and d is arbitrary. The radiation hole 5 is arranged so that its plane of polarization is parallel to the traveling direction 8 of the radio wave in the radiation unit 6. Also, in FIG. 1 (b), 3b
Is a power supply waveguide provided in the dielectric substrate 1 with a plated groove. The antenna device of FIG. 1 is constructed by integrating all of the surface of the antenna device except the radiation hole 5 in a dielectric substrate covered with a conductor. The thickness of the dielectric substrate is smaller than 1/2 of the in-dielectric wavelength of the radio wave used, and the entire dielectric substrate is like a parallel plate waveguide.

Next, the operation will be described. The electric wave fed from the feeding point 2 propagates in the feeding waveguide 3a in its own mode. Then, it propagates from the opening of the power feeding waveguide 3a toward the reflection wall 4 as a semi-cylindrical wave centered on the opening. The apertures of the power feeding waveguide 3a have the same phase, and a semicylindrical wave having a more uniform wavefront can be obtained as compared with the semicircular reflector 7 shown in FIG. 17 of the conventional example. In the power supply waveguide 3a,
Since there is no electric field on the surface of the through hole or groove, the scattering at the opening end is much smaller than that of the conventional semicircular reflector 7. As described above, since the semi-cylindrical wave with less scattering and the more uniform wave front is reflected by the reflector 4 as compared with the conventional example, the plane wave with the uniform wave front advances to the radiating portion 6 and the desired excitation is made in each radiating hole 5. The phase can be given. In addition,
The operation of the radiation section 6 in which the plane wave has proceeded is the same as the operation described in the conventional example, and a linearly polarized beam whose polarization plane is parallel to the traveling direction 8 of the radio wave is formed in the direction perpendicular to the parallel plate conductor. It is formed.

FIG. 1B shows an example in which the feeding waveguide is formed by a plated groove. The operation is the same as in FIG.

In order to reduce the reflection at the opening of the power feeding waveguide, the opening may be shaped like a horn antenna.

In this embodiment, the distance s between the radiation holes 5 is λ.
g (λg: wavelength in the parallel plate), the excitation phase of each radiation hole 5 is the same phase, and the beam is directed in the direction perpendicular to the parallel plate conductor, but the beam is directed in any direction by changing the interval s. May be.

Although the radiation holes 5 are arranged in a square array in this embodiment, the beam direction is determined by the spacing s between the rows of the radiation holes 5 arranged in the direction perpendicular to the traveling direction 8 of the radio wave.
Therefore, another arrangement method such as triangular arrangement may be used as long as the spacing s is constant. That is, the radiation holes 5 may be arbitrarily arranged in the direction perpendicular to the traveling direction 8 of the radio wave.

In the present embodiment, the polarization plane of the beam is parallel to the traveling direction 8 of the radio wave in the radiation section 6, but the polarization plane of the radiation hole 5 may be adjusted to form a beam having another polarization plane. Good.

Although a linearly polarized beam is used in the present embodiment, by adjusting the plane of polarization of the radiation hole 5 and the spacing s between the radiation holes 5, a beam of other polarization such as circular polarization can be obtained. Good.

Example 2. FIG. 2 is a front view of a second embodiment of the antenna device of the present invention. In FIG. 2, 9 is a plated through hole which is a distributor formed in the dielectric substrate. Other symbols and configurations are the same as those in FIG.

Next, the operation will be described. The electric wave fed from the feeding point 2 is distributed by the distributor 9. The phases of the radio waves emitted from the plurality of outlets of the distributor 9 are in phase with each other, and the composite wave thereof becomes a plane wave having a uniform wave front and travels to the radiating section 6. Therefore, the radiation hole 5 of the radiation unit 6 is excited in a desired phase.

In this embodiment, the coaxial waveguide converter is used as the input source, but a simple waveguide input may be used.

Although a slot is drawn as the radiation hole 5 in FIGS. 1 and 2, the radiation hole may have another shape such as a circular hole.

Example 3. 3A is a front view of the antenna device according to the third embodiment of the present invention, and FIG. 3B is a sectional view of the same. In FIG. 3A, 10 is a line segment indicating the position of the cross section of FIG. 3B, and 11 is a corner portion connecting the upper and lower two layers of the present antenna device. Other numbers are the same as in FIG.

Next, the operation will be described. The antenna device of FIG. 3 is the same as the power feeding waveguide 3a in the antenna device of FIG.
In addition, the power feeding portion including the reflecting wall 4 and the reflecting wall 4 is folded into the side of the radiation portion 6 where the radiation hole 5 is not provided. The folded feeding portion and the radiation portion 6 are connected at a corner portion 11. The electric wave fed from the feeding point 2 becomes a plane wave through the feeding waveguide 3a and the reflection wall 4 as in the antenna device of FIG. 1, and the plane wave travels to the radiating portion 6 through the corner portion 11. To do. The operation of the radiation unit 6 is exactly the same as that of the antenna device of FIG.

Although the present antenna device operates as described above, it has an advantage that the physical area becomes small because the feeding portion is folded on the back side of the radiation portion 6. For example, in the case of arranging a large number of antennas to form a larger-sized and high-gain antenna, the present antenna device having only the area of the radiation section 6 is very effective in reducing the area of the entire antenna.

Example 4. FIG. 4 is a sectional view parallel to the H surface of the power feeding waveguides 3a and 3b in the fourth embodiment of the antenna device of the present invention. In FIG. 3, 12 is an oscillation element such as a Gunn diode, and 13 is a power supply line. Other symbols and configurations are the same as those in FIG.

Next, the operation will be described. The oscillation element 12 incorporated in the power supply waveguides 3a and 3b oscillates when connected to an external power source through the power supply line 13, and the oscillated radio wave propagates through the power supply waveguides 3a and 3b. As described above, in the present embodiment, the external oscillator is unnecessary, and therefore the whole size including the external device can be miniaturized. Further, since it is not necessary to connect the coaxial connector to the power feeding waveguides 3a and 3b, and only the simple power supply line 13 needs to be connected, the structure of the power feeding unit is also simplified.

Example 5. FIG. 5A is a front view of the vicinity of the power feeding waveguide in the fifth embodiment of the antenna device of the present invention,
FIG. 5B is a sectional view parallel to the H surface of the power feeding waveguide 3a of FIG. 5A. 5A and 5B, 14 is a microstrip line, 15 is a coupling slot for coupling the microstrip line and the power feeding waveguide 3a, 16
Shows a state of an electric field near the coupling slot 15 in the power feeding waveguide 3a. Other symbols and configurations are the same as those in FIG.

Next, the operation will be described. Radio waves transmitted through the microstrip line 14 are coupled slots 15
The electromagnetic wave is electromagnetically coupled to the power feeding waveguide 3a via and is propagated in the power feeding waveguide 3a. According to the present embodiment, the antenna device does not require a coaxial waveguide converter when connecting to an external feeding circuit, and has a simple structure in which the substrate of the microstrip line 14 and the substrate of the present antenna device are stacked. It will be connected with, and the manufacturing will be easy. The power supply circuit is MIC,
It is particularly effective when constructed on a substrate.

In this embodiment, the microstrip line 14 is taken as an example of the external power feeding circuit, but it goes without saying that this may be another planar circuit such as a triplate line or a waveguide.

Example 6. FIG. 6 is a sectional view parallel to the H-plane in the vicinity of the power feeding waveguide in the sixth embodiment of the antenna device of the present invention. In FIG. 6, 17 is an external power feeding waveguide, 18
Is a corner waveguide incorporated in place of the feeding waveguides 3a and 3b in FIG. Other symbols and configurations are the same as those in FIG.

Next, the operation will be described. The radio wave traveling from the external power feeding waveguide 17 propagates inside the antenna device through the corner waveguide 18. According to the present embodiment, by using the corner waveguide 18, an external power supply circuit having a waveguide as an input / output port and an antenna device can be easily connected.

Example 7. FIG. 7 is a front view of the vicinity of the power feeding portion in the seventh embodiment of the antenna device of the present invention. In FIG. 7, reference numeral 19 is a projection for impedance matching, which is provided in a portion of the reflection wall facing the power feeding waveguide 3a.

Next, the operation will be described. A part of the radio wave propagating from the opening of the waveguide 3a is reflected by the reflection wall 4 and
It is reflected by the protrusion 19 and returns to the opening of the power feeding waveguide 3a again. There is a phase difference between the radio wave reflected by the reflection wall 4 and the radio wave reflected by the protrusion 19 by the height h of the protrusion 19. Therefore, the width t of the protrusion 19 is adjusted to equalize the amplitudes of the reflected wave from the reflection wall 4 and the reflected wave from the protrusion 19,
Moreover, the height h of the protrusion 19 is adjusted so that the projections 19 return to the opening of the power feeding waveguide 3a in opposite phases, so that the reflection from the reflection wall 4 to the power feeding waveguide 3a is improved. It

Example 8. 8 (a) is a front view of an antenna device according to a eighth embodiment of the present invention, and FIG. 8 (b) is a sectional view of the same. In FIG. 8, reference numeral 20 denotes a power feeding portion including the power feeding waveguide 3a and the reflecting wall 4, and the inside thereof is not filled with anything. Reference numeral 21 has an origin at the center of the radiating section 6, the xy plane is parallel to the parallel plate of the radiating section 6, the z axis is perpendicular to the parallel plate of the radiating section 6, and the x axis is a plane wave in the parallel plate of the radiating section 6. Is a rectangular coordinate parallel to the traveling direction of. Also, 22 is the radiating part 6
Dielectrics A and 2 with relative permittivity ε _rA filled in parallel plates of
_{Reference numeral 3 denotes} a layer of a dielectric B having a relative permittivity ε _rB , which is provided in contact with the dielectric A in a parallel plate in a portion where the power feeding unit 20 and the radiation unit 6 are connected. Note that ε _rA ≠ ε _rB . Other reference numerals are the same as in FIG.

Next, the operation will be described. The basic operation is the same as in the first embodiment. That is, a plane wave propagates from the power feeding unit 20 to the radiating unit 6, and is coupled to the external space from the radiating hole 5 in the middle. At this time, if there is a relationship of λg ≧ λ between the wavelength λg of the plane wave in the parallel plate of the radiation unit 6 and the wavelength λ of the radio wave in the external space, regardless of the arrangement of the radiation holes 5, θ = arcsin ( λ / λg)
A beam is generated in the direction of [rad], φ = 0 [rad]. When the beam is formed in the other direction by the arrangement of the radiation holes 5, the above-mentioned beam becomes a crating lobe, which must be suppressed. In the first embodiment, the radiating portion 6 is filled with the dielectric A22 so that λg <λ and the above-mentioned grating lobe is suppressed.

However, when a parallel plate is filled with a dielectric material,
In that case, dielectric loss occurs. Therefore, in this embodiment, the radiation unit
Dielectric materials should be filled in all areas except 6
Minimize body loss. Radiation from the power supply unit 20
The reflection generated when the plane wave travels to the dielectric A in the part 6
In order to suppress it, the layer 23 of the dielectric B is provided at the boundary.
It is the matching part. As in this example, flat plates are
If the surface wave travels, ε_rB= √ε_rAAnd invite
The width u of the layer 23 of the electric body B is set to u = λg_B / 4 (λg _B :dielectric
(Wavelength in the body B) allows matching. This embodiment is as described above
To improve the dielectric loss in the antenna device with a structure like
There is.

Example 9. 9A is a front view of the ninth embodiment of the antenna device of the present invention, FIG. 9B is the same sectional view, and FIG. 9C is the same sectional view of another example. 24 in FIG.
Is a matching portion formed by sequentially thinning the thickness of the dielectric A22 toward the power feeding portion 20 at the boundary between the dielectric material A22 filled in the radiation portion 6 and the power feeding portion 20.

Next, the operation will be described. The basic operation is the same as in the eighth embodiment. However, the eighth embodiment as a matching unit
Instead of providing the layer 23 of the dielectric B, the thickness of the dielectric A22 is gradually reduced toward the power feeding section 20 as shown in FIG.
The reflection at the border of is suppressed. It is the same as the eighth embodiment that the dielectric loss in the antenna device can be improved in the present embodiment.

The same effect can be obtained even if the cross section of the matching portion 24 has a shape as shown in FIG. 9C instead of the shape as shown in FIG. 9B.

Example 10. FIG. 10A is a partial view of the tenth embodiment of the antenna device of the present invention. Reference numeral 25 is a co-phase surface of the scattered wave inside the radiating part 6 generated in each radiating hole, and 26 is a traveling direction of the co-phase scattered wave. Other symbols are shown in FIG.
Is the same as FIG. 10A shows an example in which there is a radiation hole 5 in a direction perpendicular to the traveling direction 8 of radio waves in the radiation unit 6, and when the distance d between the radiation holes 5 is smaller than the wavelength λg in the radiation unit 6. Is. FIG. 10B is the same as FIG. 10A, but the distance d between the radiation holes is larger than the wavelength λg in the dielectric.

Next, the operation will be described. The basic operation is the same as in the first embodiment. That is, while the plane wave propagates through the radiation section 6, it is coupled into the space from the radiation hole 5,
At the time of this coupling, a cylindrical wave-like scattered wave is generated from the radiation hole 5 toward the inside of the radiation portion 6. As shown in FIGS. 10 (a) and 10 (b),
A row of radiation holes 5 perpendicular to the traveling direction 8 of the radio wave in the radiation section 6
In each of these, the scattered waves occur in phase. Therefore, when the distance d between the radiation holes 5 is larger than the wavelength λg in the radiation portion 6 as shown in FIG. 10B, the scattered wave generated from each radiation hole 5 is θ with respect to the normal line of the radiation hole array. = Arcsin {n
・ A cophase surface 25 is formed in the direction of λg · / d} (n: integer) and propagates with strong energy. The scattered wave propagating in the θ = 0 ° direction can be radiated from the row of micropores in the next and subsequent stages.
Scattered waves propagating in directions other than = 0 ° generate cross-polarized waves or are not radiated but are confined in the radiating portion 6 to cause loss. On the other hand, when the distance d between the radiation holes 5 is smaller than the wavelength λg in the radiation portion 6 as shown in FIG. Suppressed.

Example 11. FIG. 11 is a front view of an antenna device according to an eleventh embodiment of the present invention. Reference numerals in the figure are the same as those in the other embodiments. The number of the radiation holes 5 arranged in the radiation section 6 in a direction orthogonal to the traveling direction 8 of the radio wave is sequentially increased in the traveling direction 8 of the radio wave.

Next, the operation will be described. The basic operation is the same as in the first embodiment. That is, the plane wave is emitted by the radiation part 6.
As it goes through, the radiation holes 5 are connected to the space.
At this time, the plane wave attenuated by radiation is more strongly coupled to the space by increasing the number of the radiation holes 5, and the excitation amplitude distribution on the antenna aperture is kept uniform. Since a uniform excitation amplitude distribution on the antenna aperture is a condition for maximizing the directional gain of the antenna, a high gain can be obtained.

Example 12 FIG. 12 is a front view of an antenna device according to a twelfth embodiment of the present invention. In FIG. 12, 27 is a micropore. Other reference numerals are the same as those in the other embodiments.

Next, the operation will be described. The basic operation is the same as the conventional example. That is, by increasing the size of the radiation hole, the plane wave that is attenuated by radiation as it travels through the radiation section 6 is more strongly coupled, and the excitation amplitude distribution on the antenna aperture is kept uniform to obtain high gain. is there. However, in this embodiment, the minute holes 27 are used as the radiation holes. The use of the micro holes 27 has the following advantages. First, since the micro holes 27 are extremely small, the coupling with the adjacent micro holes 27 is also small. Therefore, even if they are arranged at considerably small intervals, the disturbance of the excitation distribution on the antenna aperture due to the coupling between the micro holes 27 is small. In addition, the fact that they can be arranged at narrow intervals, as described in the seventh embodiment, causes the radiating portion 6 generated in each micropore.
It is advantageous when the distance d is made smaller than the wavelength λg inside the radiating section 6 so that the scattered wave inside does not have a cophase surface except in the traveling direction of the plane wave. Furthermore, since it is minute, an extremely large number of minute holes 27 can be arranged in a direction perpendicular to the plane wave in the radiation section 6, but this makes it possible to reduce the amount of coupling of the plane wave inside the radiation section 6 into space. It can be adjusted widely depending on the number of the micro holes 27.

The methods of the tenth, eleventh and twelfth embodiments may be used together in order to suppress the influence of scattered waves inside the radiating section 6 or to make the excitation amplitude distribution on the antenna aperture uniform.

Although the minute holes 27 are circular in FIG. 12, similar effects can be obtained with other shapes such as an ellipse as long as they are minute.

In the eleventh and twelfth embodiments, the purpose is to make the excitation amplitude distribution on the antenna aperture uniform, but the methods of the eleventh and twelfth embodiments may be used to give other distributions.

Example 13 FIG. 13A is a front view of a radiation hole portion of an antenna device according to a thirteenth embodiment of the present invention,
FIG. 13B is a sectional view of the same. Further, FIG. 13C is a front view of a slot which has been often used as a radiation hole in the related art, and FIG. 13D is a sectional view of the same. 28 in FIG.
Symbols a, 28b, and 28c are lines of electric force near the radiation holes. 29 is an elliptical or circular radiation hole, 30 is a slot, and 31 is a parallel plate conductor of the radiation part 6. Other reference numerals are the same as those in FIG.

Next, the operation will be described. The basic operation is the same as in the first embodiment. That is, the plane wave is emitted by the radiation part 6.
As it goes through, the radiation holes 5 are connected to the space.
At this time, since the excited elliptical or circular radiation hole 29 has a certain width in the traveling direction 8 of the radio wave in the parallel plate, the state of the electric lines of force around it is shown in FIG.
As shown in (b), the lines of electric force 28 on the opening
There are electric force lines of different lengths, such as a and electric force lines 28b that are generated around the curved line. Therefore, even if the excitation frequency changes to some extent, the electric line of force having a length corresponding thereto is strongly excited, so that the elliptical or circular radiation hole 29 changes the magnitude of the excitation amplitude even when the frequency changes. Is small. On the other hand, when the slot 30 or the minute hole is used for the radiation hole, the opening width is small, so that the electric lines of force generated there are mostly concentrated on the opening as shown in FIGS. 13C and 13D. Since the lengths are all the same, there is no corresponding line of electric force when the frequency changes, and the excitation amplitude of the radiation hole changes extremely. Therefore, in the antenna provided with the elliptical or circular radiation hole as described above, since the change in the excitation amplitude of each radiation hole with respect to the frequency change is small, compared to the antenna device using a slot or a minute hole in the radiation hole, Stable operation in a wider frequency band.

In order to suppress the influence of scattered waves inside the radiating part 6 and to make the excitation amplitude distribution on the antenna aperture uniform when arranging the elliptical or circular radiating holes, the first embodiment is adopted.
The methods of 0 and 11 may be used together. Alternatively, as in the conventional example or the twelfth embodiment, a method of making the excitation amplitude distribution on the antenna aperture uniform by changing the size of the radiation hole may be used.

The same effect can be obtained by using a quadrangular or other polygonal radiating hole having a wide width in the traveling direction 8 of the radio wave in the parallel plate instead of the elliptical or circular radiating hole. .

Example 14 14 (a) and 14 (b) are front views of an antenna device according to a fourteenth embodiment of the present invention. Reference numeral 32 is a radio wave absorber installed on the side surface of the present antenna device, and 33 is a terminating end of the radiator 6. Other reference numerals and configurations are the same as those in FIG.

Next, the operation will be described. The basic operation is the same as in the first embodiment. However, the radio wave absorber 32 and the dielectric inside the radiation unit 6 are in direct contact with each other, and there is no conductor therebetween. In the embodiment shown in FIG. 14A, the rest of the plane wave that reaches the terminal end 33 without being completely radiated from the radiation hole 5 is absorbed by the radio wave absorber 32, and the disturbance of the electromagnetic field inside the radiation unit 6 due to the reflection thereof. Disappear. As a result, the disturbance of the excitation distribution of the radiation holes 5 and the loss inside the radiation portion 6 are suppressed.

If the radio wave absorber 32 is installed on the side surface other than the terminal end of the antenna device as shown in FIG. 14B, the plane wave is directed in a direction other than the traveling direction of the plane wave generated in the opening of the feeding waveguide 3a and the radiation hole 5. The scattered waves are absorbed, and the disturbance of the electromagnetic field inside the radiation unit 6 can be suppressed.

Example 15 15: is a figure in Example 15 of the antenna device of this invention. Reference numeral 34 is an antenna device installed on the front bottom surface of the moving body so that the beam direction is tilted behind the moving body, 35 is the ground, and 36 is the moving body.

Next, the operation will be described. The basic operation is the same as in the first embodiment. However, the radio wave transmitted from the antenna device 34 is scattered on the ground surface 35, the reflected wave is received again by the antenna device 34, and the speed of the moving body 36 is measured from the change in the frequency of the transmitted / received wave. In this embodiment, the antenna device 34 is installed on the bottom surface of the front portion of the moving body 36 to reduce the influence on the measurement of the tire mud splash or the influence on the main body of the antenna device 34, and to change the beam direction of the antenna device 34 to the moving body. By tilting it backwards, the measurement is prevented from being affected by the radio waves scattered by rain and snow.

Example 16 16A is a front view of an antenna device according to a sixteenth embodiment of the present invention, and FIG.
It is sectional drawing of 6 (a). 2a and 2b are feeding points, 4a,
4b is a reflection wall, 8a and 8b are radio wave traveling directions, and 37a and
37b is the direction of the beam. Other reference numerals and configurations are the same as those in FIG.

Next, the operation will be described. The basic operation is the same as in the first and fifteenth embodiments. However, in this embodiment, there are two power feeding units, and two power feeding units are provided.
Two beams are formed. That is, in FIG. 16, the electric wave fed from the feeding point 2a passes through the reflection wall 4a
The beam 37a is formed as indicated by a, and the radio wave fed from the feeding point 2b proceeds via the reflection wall 4b as indicated by 8b to form the beam 37b. Since the antenna device 34 of the fifteenth embodiment has only one beam, the obtained data of the velocity of the moving body is one. However, in the present embodiment, two data are formed in two front and rear directions of the moving body. Two beams corresponding to each beam can be obtained. In this case, as compared with the fifteenth embodiment, by performing statistical processing such as averaging data in two directions, it is possible to suppress a measurement error due to unstable movement (vibration, jumping, etc.) of the moving body. is there.

Incidentally, FIGS. 3, 5, 7, 8, 9, 11, 1
2, 14 and 16 show the power feeding waveguide 3a constituted by a plated through hole as the power feeding waveguide, but this may be the power feeding waveguide 3b constituted by a plated groove.

[0089]

According to the invention of claim 1 as described above,
A radiating part having a plurality of radiating holes on one surface of a parallel plate conductor with a dielectric material sandwiched between them, and a busbar provided in the parallel plate at a parabolic cylindrical reflecting wall, and at the focal point of the reflecting wall. In the antenna device configured by the wave source, a power supply waveguide is provided in the parallel plate with plated through holes or grooves, and the opening of the power supply waveguide is opposed to the reflection wall to form a wave source. Therefore, there is an effect that a plane wave having a uniform wave front advances to the radiating portion, and a desired phase distribution can be provided in the radiating hole, and thus a desired radiating pattern can be obtained.

According to the second aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor with a dielectric interposed therebetween, and a radiation portion connected to the radiation portion of the parallel plate conductor. In the antenna device provided with the feeding portion for propagating the plane wave between, since the feeding portion is configured by providing the distributor with the plated through hole or groove in the parallel plate, the plane wave having a uniform wavefront advances to the radiating portion. As a result, a desired phase distribution can be added to the radiation holes, and therefore, a desired radiation pattern can be obtained.

According to the third aspect of the present invention, a radiation portion having a plurality of radiation holes provided on one surface of the parallel plate conductor, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided so as to face the reflection wall on the focal point of the reflection wall, a portion other than the radiating portion,
At the boundary with the radiating part, the radiating part is folded on the side where there is no radiating hole, so that the physical area of the antenna device is reduced.

According to the invention of claim 4, a radiation portion having a plurality of radiation holes provided on one surface of a parallel plate conductor, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In the antenna device composed of the feeding waveguide in the parallel plate having the opening provided on the focal point of the reflecting wall so as to face the reflecting wall, the oscillation element is incorporated in the feeding waveguide. Since there is no need to connect to an external oscillator, there is an effect that the entire device including the outside can be simplified.

According to the invention of claim 5, the radiation portion having a plurality of radiation holes provided on one surface of the parallel plate conductor, the reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feed waveguide in the parallel plate having an opening provided on the focal point of the reflection wall so as to face the reflection wall, a surface of the feed waveguide on the parallel plate conductor side. Since a coupling hole is provided in the coil to electromagnetically couple the external power feeding circuit and the power feeding waveguide, there is an effect that the structure of connection with the power feeding circuit is simplified.

According to the invention of claim 6, a radiation portion having a plurality of radiation holes provided on one surface of a parallel plate conductor, a reflecting wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the reflecting wall so as to face the reflecting wall, a corner waveguide is used as the feeding waveguide. Since it was built in the parallel plate conductor,
This has the effect of simplifying the structure of connection with the external power feeding waveguide.

According to the invention of claim 7, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the reflecting wall so as to face the reflecting wall, the antenna device faces the feeding waveguide of the reflecting wall. Since the protrusion for impedance matching is provided in the portion, there is an effect that reflection from the reflection wall to the power feeding waveguide is improved and an antenna device with higher efficiency can be obtained.

According to the invention of claim 8, the radiation portion having a plurality of radiation holes on one surface of the parallel plate conductor, the reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the reflection wall so as to face the reflection wall, a dielectric is filled in the parallel plate of the radiation unit. , A layer of a dielectric having a dielectric constant different from that of the dielectric is provided so as to be in contact with the dielectric at a connecting portion between the radiating portion and the other portion, and is aligned with another portion in the parallel plate. Since nothing is filled in the antenna device, there is an effect that the section where the radio wave passes through the dielectric is reduced in the antenna device, the dielectric loss is improved, and the antenna device with higher efficiency can be obtained.

According to the invention of claim 9, a radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a reflection wall having a parabolic cylindrical busbar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the reflection wall so as to face the reflection wall, a dielectric is filled in the parallel plate of the radiation unit. , The thickness of the dielectric at the connecting portion between the radiating portion and the other portion is gradually reduced as the distance from the radiating portion is increased, and the other portion in the parallel plate is filled with nothing. Since this is not done, there is an effect that the section where the radio wave passes through the dielectric is reduced in the antenna device, the dielectric loss is improved, and the antenna device with higher efficiency can be obtained.

According to the tenth aspect of the present invention, a radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor having a dielectric material sandwiched between the radiation portion and the radiation portion connected to the radiation portion is provided. In an antenna device provided with a feeding section for propagating a plane wave in between, since the arrangement interval of the radiation holes in the direction orthogonal to the traveling direction of the plane wave is set to be equal to or less than the wavelength in the parallel plate conductor, the influence of scattering in the antenna Is improved and an antenna device with higher efficiency can be obtained.

According to the eleventh aspect of the present invention, the radiation portion in which a plurality of radiation holes are provided on one surface of the parallel plate conductor, and the power feeding for connecting the radiation portion to propagate a plane wave between the parallel plate conductors. In the antenna device including the portion, since the number of the radiation holes arranged in a direction orthogonal to the traveling direction of the plane wave is sequentially increased in the traveling direction of the plane wave, the aperture amplitude distribution becomes uniform, There is an effect that an antenna device having sharper directivity and high gain can be obtained.

According to the twelfth aspect of the invention, the radiation portion having a plurality of radiation holes on one surface of the parallel plate conductor, and the power feeding for connecting the radiation portion to propagate a plane wave between the parallel plate conductors. In the antenna device provided with the section, since the minute holes smaller than the wavelength are used as the radiation holes and the size of the minute holes is increased in the traveling direction of the plane wave, the aperture amplitude distribution becomes uniform. Further, there is an effect that an antenna device having sharper directivity and high gain can be obtained.

According to a thirteenth aspect of the present invention, a radiation portion having a plurality of radiation holes provided on one surface of a parallel plate conductor, and a power feed for connecting the radiation portion to propagate a plane wave between the parallel plate conductors. Since the elliptical or circular shaped radiation holes are used in the antenna device including the portion, since the variation of the excitation amplitude is small with respect to the frequency variation in these radiation holes, the antenna device is stable in a wide frequency band. It has the effect of working.

According to a fourteenth aspect of the present invention, a radiation portion having a plurality of radiation holes provided on one surface of a parallel plate conductor, a reflection wall having a cylindrical parabolic bus bar provided in the parallel plate, and the above In an antenna device composed of a feeding waveguide in the parallel plate having an opening provided on the focal point of the reflection wall so as to face the reflection wall, an electromagnetic wave is absorbed by the end face of the parallel plate conductor of the radiator. Since the body is provided, there is an effect that the influence of scattering in the antenna is improved and a highly efficient antenna device can be obtained.

According to a fifteenth aspect of the present invention, there is provided a radiation part having a plurality of radiation holes formed on one surface of two conductors forming the parallel plate conductor, and the parallel plate conductor connected to the radiation part. An antenna device provided with a power feeding unit for propagating a plane wave between and used for speed measurement of a moving body mounted on a moving body, wherein the antenna device is installed on the front bottom surface of the moving body, and the beam direction of the antenna device is set to Since the tilt is made to the rear of the moving body, the influence of tire mud splashes, rain, and snow on the measurement radio waves is reduced, and the speed of the moving body can be measured more accurately.

According to the sixteenth aspect of the present invention, there is provided a parallel plate conductor having a plurality of radiation holes formed on one surface of two conductors constituting the parallel plate conductor, and the parallel plate conductor connected to the radiation part. An antenna device equipped with a power feeding unit for propagating a plane wave between and used for measuring the speed of a moving body by mounting the antenna device on the bottom surface of the moving body and feeding power from both sides of the parallel plate conductor. Since the radiation hole is provided so as to form the beam in the front and rear directions of the moving body, the measurement data in the two directions can be obtained.
By statistically processing this, there is an effect that the speed of the moving body can be measured more accurately.

[Brief description of drawings]

FIG. 1 is a front view of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a front view of the antenna device according to the second embodiment of the present invention.

FIG. 3 is a front view and a sectional view of an antenna device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view parallel to the H-plane of the power feeding waveguide of the antenna device according to the fourth embodiment of the present invention.

FIG. 5 is a front view of the vicinity of a power feeding waveguide of an antenna device according to a fifth embodiment of the present invention and a cross-sectional view parallel to the H surface of the power feeding waveguide.

FIG. 6 is a cross-sectional view parallel to the H-plane in the vicinity of the power feeding waveguide of the antenna device according to the sixth embodiment of the present invention.

FIG. 7 is a front view of the vicinity of a power feeding portion of an antenna device according to a seventh embodiment of the present invention.

8A and 8B are a front view and a sectional view of an antenna device according to an eighth embodiment of the present invention.

9A and 9B are a front view and a cross-sectional view of an antenna device according to a ninth embodiment of the present invention.

FIG. 10 is a partial view showing a row of radiating holes arranged in a radiating portion in the antenna device according to the tenth embodiment of the present invention.

FIG. 11 is a front view of the antenna device according to the eleventh embodiment of the present invention.

FIG. 12 is a front view of an antenna device according to a twelfth embodiment of the present invention.

FIG. 13 is a diagram showing a radiation hole of an antenna device according to a thirteenth embodiment of the present invention and a state of lines of electric force in the vicinity of the conventional slot.

FIG. 14 is a front view of an antenna device according to a fourteenth embodiment of the present invention.

FIG. 15 is a diagram of an antenna device according to a fifteenth embodiment of the present invention.

16A and 16B are a front view and a sectional view of an antenna device according to a sixteenth embodiment of the present invention.

FIG. 17 is a front view of a conventional antenna device.

[Explanation of symbols]

 1 Dielectric substrate whose whole surface is covered with a conductor 2 Feeding points 3a, 3b Feeding waveguides 4, 4a, 4b Reflecting wall 5 Radiating hole 6 Radiating part 7 Semi-circular reflector 8, 8a, 8b Direction of radio wave propagation 9 Distributor 10 Line Section 11 Cross Section 11 Corner 12 Oscillator 13 Power Supply Line 14 Microstrip Line 15 Coupling Slot 16 State of Electric Field 17 External Feeding Waveguide 18 Corner Waveguide 19 Protrusion for Impedance Matching 20 Feeding Part 21 Coordinates 22 Dielectric A 23 Layer of dielectric B 24 Matching part 25 Co-phase plane of scattered wave 26 Direction of propagation of scattered wave in co-phase 27 Micropores 28a, 28b, 28c Electric force line 29 Elliptical or circular radiation Hole 30 slot 31 parallel plate conductor of the radiating part 6 radio wave absorber 33 end of the radiating part 34 antenna device 35 ground 36 moving body 37a, 37b bee Direction

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[Procedure amendment]

[Submission date] June 22, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0076

[Correction method] Change

[Correction content]

In the eleventh and twelfth embodiments, the purpose was to make the excitation amplitude distribution on the antenna aperture uniform, but the method of the eleventh and twelfth embodiments may be used to add another distribution.

Front page continued (72) Inventor Shinichi Sato 5-1-1 Ofuna, Kamakura-shi Electronic Systems Research Laboratories, Mitsubishi Electric Corporation (72) Inventor Takashi Kataki 5-1-1 Ofuna, Kamakura-shi Electronics Mitsubishi Electric Corporation System Research Center

Claims (16)

[Claims] 1. A radiating portion having a plurality of radiating holes on one surface of a parallel plate conductor sandwiching a dielectric material between the radiating portion, a parabolic cylindrical reflecting wall having a busbar provided in the parallel plate conductor, and In an antenna device including a wave source provided at a focal point of a reflecting wall, a wave feeding source is provided in the parallel plate conductor, and a wave source is provided with an opening of the power feeding waveguide facing the reflecting wall. The antenna device characterized in that 2. A radiation part having a plurality of radiation holes on one surface of a parallel plate conductor having a dielectric material sandwiched therebetween, and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. In the antenna device having the above-mentioned, the antenna device is characterized in that a distributor is provided by a plated through hole or groove in the parallel plate conductor to constitute a power feeding portion. 3. A radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device configured with a feeding waveguide formed in the parallel plate conductor having an opening provided so as to face the reflection wall, a portion other than the radiation portion is a boundary between the radiation portion and the radiation portion. Then, the antenna device is characterized in that it is folded into a side of the radiation section where there is no radiation hole. 4. A radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focal point of the reflection wall. In an antenna device configured to include a power feeding waveguide formed in the parallel plate conductor having an opening provided so as to face a reflection wall, an oscillator element may be incorporated in the power feeding waveguide. Characteristic antenna device. 5. A radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device comprising a feeding waveguide formed in the parallel plate conductor having an opening provided so as to face the reflection wall, a plane on the parallel plate conductor side of the feeding waveguide is provided. An antenna device characterized in that a coupling hole is provided to electromagnetically couple a feeding circuit provided outside a parallel plate conductor and the feeding waveguide. 6. A radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device comprising a feeding waveguide formed in the parallel plate conductor having an opening so as to face a reflection wall, a corner waveguide is used as the feeding waveguide. An antenna device characterized by being incorporated in a conductor. 7. A radiation part having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focal point of the reflection wall. In an antenna device comprising a feeding waveguide formed in the parallel plate conductor having an opening provided so as to face the reflecting wall, in a portion of the reflecting wall facing the feeding waveguide. An antenna device having a protrusion for impedance matching. 8. A radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device configured with a feeding waveguide formed in the parallel plate conductor having an opening provided so as to face the reflection wall, a dielectric is filled in the parallel plate conductor of the radiating portion, An antenna device, characterized in that a dielectric having a dielectric constant different from that of the dielectric is provided so as to be in contact with the dielectric at a boundary between the radiating portion and the other portion, and the matching is achieved. 9. A radiation portion having a plurality of radiation holes formed on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic busbar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device configured with a feeding waveguide formed in the parallel plate conductor having an opening provided so as to face the reflection wall, a dielectric is filled in the parallel plate conductor of the radiating portion, An antenna device, characterized in that at the boundary between the radiating portion and the other portion, the thickness of the dielectric is gradually reduced as the distance from the radiating portion is increased, and matching is performed. 10. A radiating portion having a plurality of radiating holes formed on one surface of a parallel plate conductor having a dielectric material sandwiched between the radiating portion and a feeding portion for propagating a plane wave between the parallel plate conductors connected to the radiating portion. In the provided antenna device, the arrangement interval of the radiation holes in a direction orthogonal to the traveling direction of the plane wave is set to be equal to or less than the wavelength in the parallel plate conductor. 11. An antenna device comprising: a radiation part having a plurality of radiation holes on one surface of a parallel plate conductor; and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. An antenna device, wherein the number of the radiation holes arranged in a direction orthogonal to the traveling direction of the plane wave is increased in the traveling direction of the plane wave. 12. An antenna device comprising: a radiation part having a plurality of radiation holes on one surface of a parallel plate conductor; and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. An antenna device characterized in that a minute hole smaller than a wavelength is used as the radiation hole, and the size of the minute hole is gradually increased in a traveling direction of the plane wave. 13. An antenna device comprising: a radiation part having a plurality of radiation holes on one surface of a parallel plate conductor; and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. An antenna device using an elliptical or circular radiation hole. 14. A radiation portion having a plurality of radiation holes on one surface of a parallel plate conductor, a cylindrical reflection wall having a parabolic bus bar provided in the parallel plate conductor, and the focus on the reflection wall. In an antenna device comprising a feeding waveguide formed in the parallel plate conductor having an opening so as to face the reflection wall, a radio wave absorber is provided on an end face of the parallel plate conductor of the radiating section. An antenna device characterized by being provided. 15. A radiating part having a plurality of radiating holes on one surface of two conductors forming a parallel plate conductor, and a feeding part connected to the radiating part for propagating a plane wave between the parallel plate conductors. An antenna device mounted on a mobile body and used for measuring the speed of the mobile body, wherein the antenna device is installed on the front bottom surface of the mobile body, and the beam direction of the antenna device is tilted behind the mobile body. An antenna device characterized in that 16. A radiation part having a plurality of radiation holes formed on one surface of two conductors forming a parallel plate conductor, and a feeding part connected to the radiation part for propagating a plane wave between the parallel plate conductors. An antenna device mounted on a moving body and used for measuring the speed of the moving body, wherein the antenna device is installed on the bottom surface of the moving body, and power is supplied from both sides of the parallel plate conductor to two front and rear sides of the moving body. An antenna device, wherein the radiation hole is provided so as to form a beam in a direction.