JPH11103204A - Strip line and antenna system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the reflection and loss of microwaves by providing an almost plate-shaped protruding part on a surface, forming a through hole for the lateral width of 1st width at its root section, forming conductors over the entire surface of a dielectric with the same plane of a surface as its lower face and the lower face of the through hole and providing the band-shaped strip conductor of 2nd width narrower than the 1st width on the rear face of the dielectric. SOLUTION: Concerning a strip conductor 33, a conductor is longitudinally formed into thin film on a rear face 30d of a dielectric 30, and width W is narrower than the width of a through hole 30c. Since the through hole 30c is formed at a protruding part 30a so that the effective thickness of the dielectric 30 in the view from the strip conductor 33 at the section of the through hole 30c is d2 equal with thickness d1 , the thickness of the dielectric in the view from the strip conductor 33 can be regarded as d1 over the entire area. Therefore, even in the case of the dielectric 30 with which the extremely thick protruding part 30a exists, the reflection and loss of microwaves of a transmission medium can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip line suitable for various antennas having a ground plate and a reflector, such as a three-dimensional corner reflector antenna, a monopole antenna, a monopole Yagi / Uda antenna with a ground plate, and a strip line suitable for the antenna. The present invention relates to an antenna device used.

[0002]

2. Description of the Related Art FIG. 11A is a perspective view showing a configuration of a conventional strip line, and FIG. 11B is a side view showing a configuration of a conventional strip line. FIG.
In (a) and (b), 1 is a plate-shaped dielectric formed to have a thickness of d1. The dielectric constant of the dielectric 1 is εr. Reference numeral 2 denotes a strip-shaped strip conductor formed on the surface of the dielectric 1 by a thin film.
W1. Reference numeral 3 denotes a ground plane formed on the entire back surface of the dielectric 1 as a thin film, and functions as a ground plane of the strip conductor 2.

In the above configuration, the characteristic impedance Z of the strip line is approximated by a quasi-TEM wave, and the magnetic permeability of the dielectric 1 is μ, the relative permittivity of the dielectric 1 is εr, the permittivity in a vacuum is ε0, The thickness of the dielectric 1 is d1, the strip conductor 2
Is represented by the following expression (1), where W is the width of Z = ((μ / εr · ε0)) · (d1 / W1) [Ω] (1) The details of the strip lines shown in FIGS. 11A and 11B are described below. Yoshiyuki Naito, Introduction to Information Transmission pp.
195-199.

Here, with reference to FIGS. 12 (a), 12 (b) and 12 (c), a description will be given of the influence of a dielectric material having a non-uniform thickness on the characteristic impedance Z described above.
In FIG. 12A, reference numeral 4 denotes a dielectric having a portion having a thickness d1 and a portion having a thickness d2, and a protrusion 4a is formed on the back surface thereof.

That is, the dielectric 4 is formed such that the thickness of the protrusion 4a is d2 and the thickness of the portion other than the protrusion 4a is d1. Reference numeral 5 denotes a strip-shaped strip conductor formed on the surface of the dielectric 4 in the form of a thin film. The width of the portion corresponding to the protrusion 4a is W2, and the width of the portion other than the width W2 is W1 (<W2 ). 6 is
This is a ground plate in which a thin film is formed on the entire back surface of the dielectric 4.

Here, the dielectric 4 and the strip conductor 5
Are formed so as to have a relationship of d1 / W1 = d2 / W2, and when the above relationship is satisfied, the characteristic impedance Z satisfying the above-described expression (1) is obtained in the entire strip line. However, in the strip line shown in FIG. 12A, since the thickness of the dielectric material 4 changes abruptly from d1 to d2, reflection and loss of a microwave serving as a transmission medium occurs.

In order to reduce the above-described microwave reflection and loss, a strip line shown in FIG. 12B is used. In FIG. 12B, reference numeral 7 denotes a dielectric having a portion having a thickness d1 and a portion having a thickness d2, and a protruding portion 7a is formed on the rear surface thereof in a tapered shape. That is, the dielectric 7 is formed such that the thickness of the protrusion 7a gradually becomes d1 from the thickness d2 of the portion other than the protrusion 7a.

Reference numeral 8 denotes a strip-shaped strip conductor formed on the surface of the dielectric 7 as a thin film. The width of a portion corresponding to the protruding portion 7a is W2, and the width of a portion other than the width W2 is W2. And W1 (<W2). Reference numeral 9 denotes a ground plate formed on the entire back surface of the dielectric 7 as a thin film.

In the above configuration, since both the dielectric 7 and the strip conductor 8 are formed in a tapered shape, the reflection and loss of microwaves at the protruding portion 7a are reduced.

Here, referring to FIG. 12C, FIG.
The influence of the characteristic impedance Z when the thickness d2 of the protrusion 4a of the dielectric 4 shown in FIG. In FIG. 12C, reference numeral 10 denotes a dielectric having a portion having a thickness d1 and a portion having a thickness d2, and a protruding portion 10a is formed on the rear surface thereof. Here, the thickness d2 shown in FIG. 12 (c) is a very large value compared to the thickness d2 shown in FIG. 12 (a). 1
Reference numeral 1 denotes a strip-shaped strip conductor formed on the surface of the dielectric 10 as a thin film, and the width of a portion corresponding to the protrusion 10a is W.
2 and the width of the portion other than the width W2 is W1 (<
W2). Here, FIG.
The width W2 shown in FIG. 12C is a value much larger than the width W2 shown in FIG. Reference numeral 12 denotes a ground plate formed on the entire back surface of the dielectric 10 as a thin film.

In the above configuration, since the thickness d2 is a very large value in the portion of the strip conductor 11 having the width W2, the ground plate 12 facing the portion having the width W2 does not function as a ground plane. Therefore, in the stripline shown in FIG. 12C, it can be approximated by a quasi-TEM wave.
Therefore, a uniform characteristic impedance Z cannot be obtained in the entire strip line. For this reason, in the strip line shown in FIG. 12C, the reflection and loss of the microwave become extremely large as compared with the strip line shown in FIG.

FIGS. 13A and 13B are side sectional views showing the configuration of an antenna device using a conventional strip line. The antenna device shown in FIGS. 13A and 13B operates as a monopole Yagi-Uda antenna. In FIG. 13A, reference numeral 13 denotes a protrusion 13a on the surface thereof.
Is a plate-like dielectric formed. 14 is a dielectric 13
This is a ground plane in which a conductor is formed as a thin film on the entire surface of the (projecting portion 13a), and acts as a ground plane of the antenna element 17 described later. Further, the protrusion 13a and the protrusion 13a
The ground plate 14 formed with a thin film on the surface of the antenna element 1
7 acts as the reflector 15.

Reference numeral 16 denotes a strip conductor buried inside the dielectric 13 along the ground plate 14. The antenna element 17 is disposed in front of the reflection plate 15 (to the right in the figure), the lower end thereof is electrically connected to the end of the strip conductor 16, and is vertically provided on the dielectric 13. . 1
Reference numerals 8, 18,... Denote a plurality of directors arranged linearly in front of the antenna element 17 (to the right in the figure).
Reference numeral 19 denotes a ground plane in which a conductor is formed as a thin film on the entire back surface of the dielectric 13, and functions as a ground plane of the strip conductor 16.

Here, in FIG. 13A, as described with reference to FIG. 12C, the reflector 15 does not act as a ground plate, so that the ground plate 19 is , The ground plane 14 relative to the antenna element 17
Are provided, and a triplate structure is provided.

Next, another configuration example of an antenna device using a conventional strip line will be described with reference to FIG. In FIG. 13B, portions corresponding to the respective portions in FIG. 13A are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 13B, the strip conductor 16, the antenna element 17, and the ground plane 1 shown in FIG.
9, a strip conductor 20, an antenna element 21 and a ground plane 22 are provided.

The strip conductor 20 is formed by forming a thin film on the back surface of the dielectric 13 and below the reflector 15. The antenna element 21 is disposed in front of the reflection plate 15, and the lower end thereof is electrically connected to the end of the strip conductor 20, and extends vertically from the dielectric 13.
The ground plane 22 is entirely buried inside the dielectric 13 along the ground plane 14.

That is, in FIG. 13 (a), the ground plate 19 is located below the strip conductor 16, whereas in FIG. 13 (b), the ground plate 22 is located above the strip conductor 20. ing. Here, FIG.
Since the reflector 15 does not act as a ground plane as in the case of FIG. 13A, the ground plane 22 is provided for the strip conductor 20 and the ground plane 14 is provided for the antenna element 21. It has a triplate structure.

[0018]

By the way, in the conventional strip line, when the thickness of the protrusion 10a of the dielectric 10 is very large as shown in FIG.
Base plate 1 at projecting portion 10a with respect to strip conductor 11
2 has a drawback that it does not act as a ground plane.
For this reason, in the case where a dielectric having a protrusion is used in the related art, it is difficult to manufacture a strip line having a very large protrusion and a very small microwave reflection and loss. Was.

Further, in an antenna device using a conventional strip line, as described with reference to FIGS. 13A and 13B, a dielectric 13 having a very thick projection 13a is used. If so, a triplate structure must be used for the reasons described above. Therefore, in a conventional antenna device using a stripline, a plurality of dies for manufacturing the same are required, and the manufacturing process is complicated.

The present invention has been made under such a background, and it is possible to reduce microwave reflection and loss even when a dielectric having a very thick protrusion is used. It is another object of the present invention to provide a strip line capable of simplifying a manufacturing process and an antenna device using the same.

[0021]

According to the first aspect of the present invention, a substantially plate-shaped protrusion is formed on the surface, and a through hole having a first width is formed at the base of the protrusion. A substantially plate-shaped dielectric having a lower surface and the surface flush with the lower surface of the through hole, and a ground plate formed by forming a thin conductor on the entire surface of the dielectric and the lower surface of the through hole. And a strip-shaped strip conductor formed by forming a thin film such that a second width thereof is smaller than the first width so that a conductor is provided on the back surface of the dielectric so as to be located below the through hole. It is characterized by having. The invention according to claim 2 has a substantially plate-shaped dielectric having a substantially plate-shaped protrusion on its surface, and a plurality of slits formed at predetermined intervals in the protrusion, A ground plate in which a conductor is formed as a thin film on the entire surface of the dielectric and the surface of the protrusion; and And a strip conductor. According to a third aspect of the present invention, there is provided a projection having a substantially plate-like projection on a surface thereof, and a through-hole having a first width in a lateral width is formed at a root portion of the projection. A substantially plate-shaped dielectric having a lower surface and the surface coplanar with each other; a ground plate on which a conductor is formed as a thin film over the entire surface of the dielectric and the lower surface of the through hole; A strip-shaped strip conductor formed by forming a thin film such that a second width thereof is smaller than the first width;
An antenna element is provided vertically to the dielectric so as to be located in front of the protrusion, and has an antenna element having a lower end electrically connected to the strip conductor. According to a fourth aspect of the present invention, in the antenna device using the strip line according to the third aspect, the through-hole is positioned so as not to overlap a direction opposite to a maximum radiation direction of a radio wave radiated from the antenna element. It is characterized by being formed in. The invention according to claim 5, wherein the substantially plate-shaped dielectric having a substantially plate-shaped protrusion on the surface thereof, and a plurality of slits formed at predetermined intervals in the protrusion, A ground plate in which a conductor is formed as a thin film on the entire surface of the dielectric and the surface of the protrusion; and It is characterized by comprising a strip conductor and an antenna element which is vertically provided on the dielectric so as to be located in front of the projecting portion, and whose lower end is electrically connected to the strip conductor. According to a sixth aspect of the present invention, in the antenna device using the strip line according to the fifth aspect, the plurality of slits do not overlap with a direction opposite to a maximum radiation direction of a radio wave radiated from the antenna element. It is characterized in that it is formed only at each position. According to a seventh aspect of the present invention, a plurality of through-holes having a first width and a plurality of through-holes having a first width are provided at a root portion of the protruding portion. A substantially plate-shaped dielectric formed on each of the locations, the lower surface of the through-hole and the surface thereof being flush with each other, and a ground plate formed by forming a thin conductor on the surface of the dielectric and the surface of the protruding portion. When,
A conductor has a second width smaller than the first width on the back surface of the dielectric so as to be positioned below the plurality of through holes and extend radially from the center of the dielectric in a radial direction. A plurality of strip-shaped strip conductors each formed of a thin film so as to be formed, and each of the plurality of strip conductors are respectively suspended from the dielectric so as to be positioned in front of the protrusion, and each lower end is electrically connected to the plurality of strip conductors. And a plurality of antenna elements connected to each other. Claim 8
The invention described in (1), in the antenna device using the stripline according to claim 7, wherein a plurality of 波長 wavelength matching circuits respectively inserted between the plurality of strip conductors and the plurality of antenna elements are provided. It is characterized by having.
According to a ninth aspect of the present invention, in the antenna device using the strip line according to the seventh or eighth aspect, the plurality of through holes are provided in a maximum radiation direction of a radio wave radiated from each of the plurality of antenna elements. Are formed at positions that do not overlap with the opposite direction. The invention according to claim 10 has a thick cylindrical projection on the surface thereof, and a plurality of slits are formed at a plurality of circumferentially equal portions at a base portion of the projection in a circumferential direction. A substantially plate-shaped dielectric, a ground plate in which a conductor is formed in a thin film on the surface of the dielectric and the surface of the protruding portion, and each is positioned below each of the plurality of slits, and from the center of the dielectric. A strip-shaped strip conductor in which a conductor is formed as a thin film on the back surface of the dielectric so as to extend radially in a radial direction;
A plurality of antenna elements are provided vertically to the dielectric so as to be located in front of the protruding portions, respectively, and each lower end is electrically connected to the plurality of strip conductors. . The invention according to claim 11 is
11. The antenna device using a strip line according to claim 10, further comprising a plurality of quarter-wave matching circuits interposed between the plurality of strip conductors and the plurality of antenna elements. And Claim 1
According to a second aspect of the present invention, in the antenna device using the strip line according to the tenth or eleventh aspect, each of the plurality of slits has a direction opposite to a maximum radiation direction of a radio wave radiated from each of the plurality of antenna elements. It is characterized in that each is formed at a non-overlapping position.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of the strip line according to the first embodiment of the present invention. In this figure, reference numeral 30 denotes a plate-shaped dielectric, the thickness of which is d1.
It is formed so that it becomes. A projection 30a extending upward is formed on the surface 30b of the dielectric 30 so as to protrude in the horizontal direction in FIG.

Reference numeral 30c denotes a through hole formed in the center of the base of the projection 30a in the horizontal direction in FIG.
a from the front surface to the back surface. This through hole 30
The lower surface of c and the surface 30b of the dielectric 30 are flush with each other. In addition, the through hole 3 extends from the surface 30 b of the dielectric 30.
The distance to the upper side of 0c, in other words, the height of the through hole 30c is h. The height h is 0.1 times, preferably 0.05 times, the wavelength of the microwave as the transmission medium. Note that the height h is appropriately changed according to a design change or the like.

Reference numeral 31 denotes the entire surface 30b of the dielectric 30,
And a ground plate in which a conductor is formed as a thin film over the entire protruding portion 30a, and acts as a ground surface of a strip conductor 33 described later. Here, in FIG.
Is shown including the thickness of the base plate 31 in the thickness d1 of the first embodiment, but here, the thickness of the base plate 31 is regarded as zero. In addition,
The base plate 31 is formed in the through hole 3 in the surface 30 b of the dielectric 30.
It is also formed in the portion 0c. When the strip line is used as a part of the antenna device, the protrusion 30
a and the base plate 3 formed as a thin film over the entire protruding portion 30a
1 is used as the reflection plate 32.

The strip conductor 33 is formed by forming a thin film on the back surface 30d of the dielectric 30 in the vertical direction in the figure, and has a width W smaller than the width of the through hole 30c. Also,
The width W of the strip conductor 33 is constant from the front to the rear in the figure, and the strip conductor 33 is positioned on the back surface 3 of the dielectric 30 so that the through-hole 30c is located above the strip conductor 33.
0d is formed as a thin film.

In the above configuration, the thickness of the dielectric 30 as viewed from the strip conductor 33 is d1 in the entire region from the front to the rear in FIG. That is, since the through hole 30c is formed in the protruding portion 30a, the effective thickness of the dielectric 30 as viewed from the strip conductor 33 in the through hole 30c is d2, which is equivalent to the thickness d1.
The thickness of the dielectric 30 as viewed from the strip conductor 33 can be regarded as d1 over the entire area.

Therefore, according to the strip line according to the first embodiment described above, as shown in FIG. 12C, the dielectric 3 having the very thick protrusion 30a is present.
Even if it is 0, the characteristic impedance Z can be made constant over the entire area while keeping the width W of the strip conductor 33 constant. For this reason, according to the stripline according to the above-described first embodiment, even when the very thick protrusion 30a exists in the dielectric 30, the reflection and loss of the microwave as the transmission medium are reduced. be able to.

<Second Embodiment> Next, the configuration of an antenna device using a strip line according to a second embodiment of the present invention will be described with reference to FIGS. 2 (a) and 2 (b).
FIG. 2A is a perspective view illustrating a configuration of an antenna device using a stripline according to the second embodiment.
FIG. 2B is a sectional view taken along line AA shown in FIG.
2A and 2B, parts corresponding to the respective parts in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 2A, an opening hole 31a is formed in the base plate 31, and an antenna element 34 is newly provided. The strip conductor 33 shown in FIG. 2B is formed on the back surface 30d of the dielectric 30 so as to be shorter than the length of the strip conductor 33 shown in FIG. 1, and has a width of W over the entire region. It has been.

The antenna element 34 shown in FIG. 2 (b) projects upward from the opening 31a of the base plate 31,
The lower end of the strip conductor 33 is electrically connected to the end 33 a of the strip conductor 33. In this case, as described above, since the thickness d1 of the dielectric 30 shown in FIG. 2A can be regarded as being electrically constant over the entire area, the ground plane 31 shown in FIG. Acts as a common ground plane for element 34 and strip conductor 33.

In the above configuration, the dielectric 30, the ground plane 31
When microwaves are supplied to the strip line composed of the strip conductor 33 and the strip conductor 33, the microwaves are radiated from the antenna element 34. At this time, the emitted microwave has directivity in the plus X-axis direction due to the reflection plate 32.

As described above, according to the antenna device using the strip line according to the second embodiment of the present invention, the ground plane 31 can be used as a common ground plane for the strip conductor 33 and the antenna element 34. Compared to the conventional triplate antenna device,
Even if it is manufactured by die molding, it can be easily manufactured with a small number of molds.

<Third Embodiment> Next, the configuration of a strip line according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing the configuration of the strip line according to the third embodiment. In FIG. 3, 40 is
It is a plate-shaped dielectric, and a protrusion 40a extending upward is formed on the surface 40b of the dielectric in a lateral direction in FIG. The projection 40a has a slit width Ws at a certain interval.
Are formed from the lower end to the upper end. The slit width Ws is 0.1 times the wavelength of the microwave as the transmission medium, preferably 0.05 times.
It is doubled. The slit width Ws is appropriately changed by a design change or the like.

Reference numeral 41 denotes the entire surface 40b of the dielectric 40,
And a base plate in which a conductor is formed as a thin film over the entire protruding portion 40a in which the slits 40c, 40c,.
It functions as a ground plane of a strip conductor 43 described later. When the strip line is used as a part of the antenna device, the protruding portion 40a and the ground plane 41 formed as a thin film over the entirety of the protruding portion 40a function as a reflector 42. The strip conductor 43 is provided on the back surface 40 of the dielectric 40.
d, a conductor is formed in a thin film in the vertical direction in FIG.
Is a constant value from the front to the rear in FIG.

According to the above configuration, the protrusion 4 of the dielectric 40
Since a plurality of slits 40c, 40c,... Are formed in Oa, the thickness of the dielectric 40 viewed from the strip conductor 43 can be considered to be constant from the front to the rear of the figure. Therefore, according to the strip line according to the third embodiment described above, even if the dielectric 40 has the very thick protrusion 40a as shown in FIG. While keeping the width W constant,
The characteristic impedance Z can be made constant over the entire region.

Therefore, according to the strip line according to the third embodiment described above, the very thick protrusion 4
Even when Oa exists in the dielectric 40, the reflection and loss of the microwave as the transmission medium can be reduced. Furthermore, according to the strip line according to the third embodiment described above, since the strip line is pulled out in one direction by using a mold in the manufacturing process, it can be easily manufactured with one mold.

<Fourth Embodiment> Next, the configuration of an antenna device using a strip line according to a fourth embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b).
FIG. 4A is a perspective view showing a configuration of an antenna device using a strip line according to the fourth embodiment.
FIG. 4B is a cross-sectional view taken along the line BB shown in FIG.
4A and 4B, parts corresponding to the respective parts in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
In (a) and (b), an opening hole 41 is formed in the main plate 41.
a is formed, and an antenna element 44 and a director 45 are newly provided.

The antenna element 44 shown in FIG. 4B projects upward from the opening hole 41a of the base plate 41.
The lower end of the strip conductor 43 is electrically connected to the end 43 a of the strip conductor 43. In this case, as described above, the thickness of the dielectric 40 shown in FIG. 4A can be regarded as being electrically constant over the entire area, so that the ground plane 41 shown in FIG. Acts as a common ground plane for element 44 and strip conductor 43. The director 45 is provided in front of the antenna element 44.

In the above configuration, the dielectric 40, the ground plate 41
When a microwave is fed to a strip line composed of the strip conductor 43 and the strip conductor 43, the microwave is radiated from the antenna element 44. At this time, the emitted microwave has directivity in the plus X-axis direction due to the reflector 42 and the waveguide 45. Further, in the above configuration, the slit width Ws of the slits 40c, 40c,.
2 can be electrically regarded as a reflector having no slit.

As described above, according to the antenna device using the strip line according to the third embodiment of the present invention, the ground plane 41 can be used as a common ground plane for the strip conductor 43 and the antenna element 44. Compared to the conventional triplate antenna device,
Even if it is manufactured by die molding, it can be easily manufactured with a small number of molds.

<Fifth Embodiment> Next, the configuration of an antenna device using a stripline according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a perspective view showing the configuration of an antenna device using a strip line according to the fifth embodiment. In this figure, the portions corresponding to the respective portions in FIG. Is omitted. In FIG. 5, the locations and numbers of the slits 40c, 40c,... Formed in the protrusion 40a of the dielectric 40 shown in FIG.
Are formed at different positions. Also, in FIG. 5, the illustration of the director 45 shown in FIG. 4A is omitted.

That is, in FIG. 5, the projecting portion 40a has four slits 40c, 40 near only the left side surface in FIG.
are formed, and the slits 40c are not formed in other portions. That is, the protrusion 40a
In, the slits 40c and 40c are not formed in a portion located in a direction opposite to the maximum radiation direction R of the microwave radiated from the antenna element 44, in other words, in a portion located behind the antenna element 44 in FIG.

Further, the strip conductor 43 is
0c, 40c,...
0 on the back surface 40d. That is, the strip conductor 43 is formed as a thin film so as to be oblique to the maximum radiation direction R of the microwave.

According to the above configuration, no slits 40c, 40c,... Are formed at the protruding portion 40a located in the direction opposite to the maximum radiation direction R of the microwave.
The effect of the slits 40c, 40c,... On the antenna characteristics can be reduced as compared with the antenna device using the strip line according to the fourth embodiment.

<Sixth Embodiment> Next, the configuration of an antenna device using a stripline according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing the configuration of an antenna device using a strip line according to the sixth embodiment. In this figure, the portions corresponding to the respective portions in FIG. Omitted. In FIG. 6, instead of the through hole 30c shown in FIG. 2A, a through hole 30e is formed in the protruding portion 30a, and the formation position of the strip conductor 33 is different.

That is, the through hole 30e shown in FIG. 6 is formed near the left side surface of the projection 30a in the figure, and the formation position is shifted from the direction opposite to the maximum radiation direction R of the microwave. ing. The strip conductor 33 is formed as a thin film on the back surface 30d of the dielectric 30 so as to be located below the through hole 30e. That is, the strip conductor 33 is formed as a thin film so as to be oblique to the maximum radiation direction R of the microwave. The strip conductor 33 is formed such that its width W is smaller than the width of the through hole 30e.

According to the above configuration, the through hole 30e is not formed in the portion of the protruding portion 30a located in the direction opposite to the maximum radiation direction R of microwaves. This can be reduced as compared with the antenna device using the strip line according to the second embodiment.

<Seventh Embodiment> Next, the configuration of an antenna device using a strip line according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 7 is a rear view showing the configuration of the antenna device using the stripline according to the seventh embodiment. In FIG. 7, reference numeral 50 denotes a disk-shaped dielectric, and a thick cylindrical projection 50a around the center O is formed on the surface (on the back side of the drawing). The protruding portion 50a is provided on the protruding portion 3 shown in FIG.
0a or the protrusion 40a shown in FIG. 4A has the same configuration as that formed in a cylindrical shape.

In the protruding portion 50a, through holes (not shown) similar to the through holes 30c shown in FIG. That is, the plurality of through holes are provided corresponding to a plurality of strip conductors 53, 53,.

Reference numeral 51 denotes the surface of the dielectric 50 and the protrusion 5
0a is a ground plane in which a conductor is formed as a thin film on the surface. The protruding portion 50a and the ground plate 51 formed as a thin film on the protruding portion 50a function as a reflector 52 in the same manner as the reflector 32 shown in FIG. Strip conductors 53, 5
Are formed by forming a thin conductor on the back surface (the front side of the drawing) of the dielectric 50 so as to extend radially from the center O in the radial direction.

These strip conductors 53, 53,...
Is smaller than the width of the plurality of through holes formed in the protruding portion 50a. , Are a plurality of antenna elements respectively suspended at positions corresponding to the strip conductors 53, 53,... So that the upper ends thereof protrude from the surface of the dielectric 50. The lower ends of these antenna elements 54, 54,.
, 53,... Are electrically connected to respective one ends.

Here, the base plate 51 is made of strip conductors 53, 53,... In the same manner as the base plate 31 shown in FIG.
, And serve as a common ground plane for the antenna elements 54, 54,... 55 is an antenna element 54, 54,
Is a sector switch for switching and controlling power supply to.

The operation of the antenna device using the strip line according to the seventh embodiment is the same as that of the seventh embodiment except that the power supply state to the antenna elements 54, 54,. FIG. 2 (a)
Since the operation is the same as the operation of the antenna device using the strip line shown in FIG.

As described above, according to the antenna device using the stripline according to the seventh embodiment of the present invention, the ground plane 51 is formed by the strip conductors 53, 53,... And the antenna elements 54, 54,. Can be used as a common ground plane, and can be easily manufactured with a small number of molds even when manufactured by die molding, as compared with a conventional triplate structure antenna apparatus.

In the antenna device using the stripline according to the seventh embodiment described above, an example in which a plurality of through holes are formed in the protruding portion 50a shown in FIG. 7 has been described. However, the present invention is not limited to this. 4A, a plurality of slits may be formed at a plurality of locations of the protruding portion 50a so as to go around. In this case, the same effect as that of the antenna device using the strip line shown in FIG.

<Eighth Embodiment> Next, the configuration of an antenna device using a strip line according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a rear view showing the configuration of the antenna device using the strip line according to the eighth embodiment. 8, parts corresponding to the respective parts in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In this figure, the strip conductors 53, 5 shown in FIG.
, A strip wavelength 56, 56,..., A 波長 wavelength matching circuit 57 instead of the antenna elements 54, 54,.
, And antenna elements 58, 58, ... are provided.

The strip lines 56 shown in FIG.
Is formed by forming a thin conductor on the back surface (front side of the drawing) of the dielectric 50 so as to extend radially from the center O in the radial direction. These strip conductors 56, 56, ...
Has a width smaller than the width of the plurality of through holes formed in the protruding portion 50a, and has a length smaller than the strip conductors 53, 53,... Shown in FIG. .

The 1/4 wavelength matching circuits 57, 57,.
Are formed on the back surface of the dielectric 50 so as to extend the strip lines 56, 56,. 58, 58, ...
Are antenna elements vertically provided at positions corresponding to the quarter-wavelength matching circuits 57, 57,... So that each upper end protrudes from the surface of the dielectric 50. The lower ends of the antenna elements 58, 58,... Are electrically connected to the respective ends of the quarter-wavelength matching circuits 57, 57,. In addition, the base plate 51 includes strip lines 56, 5
, 1/4 wavelength matching circuits 57, 57,..., And antenna elements 58, 58,.

The basic operation of the antenna device using the strip line according to the eighth embodiment is almost the same as the basic operation of the antenna device using the strip line according to the seventh embodiment. Therefore, the description is omitted.

As described above, according to the antenna device using the strip lines according to the eighth embodiment of the present invention, the ground plane 51 is connected to the strip lines 56, 56,.
/ 4 wavelength matching circuits 57, 57,..., Antenna element 5
, 58,... Can be used as a common ground plane. Can be manufactured.

In the antenna device using the strip line according to the eighth embodiment described above, similarly to the antenna device using the strip line according to the seventh embodiment, the protrusion 50a is used instead of the plurality of through holes. A plurality of slits may be formed at a plurality of locations so as to go around. In this case, the same effect as that of the antenna device using the strip line shown in FIG.

<Ninth Embodiment> Next, the configuration of an antenna device using a strip line according to a ninth embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b).
FIGS. 9A and 9B are rear views showing the configuration of an antenna device using a stripline according to the ninth embodiment. FIGS. 9A and 9B show portions corresponding to FIG. Are denoted by the same reference numerals and description thereof will be omitted. FIG.
In (a) and (b), the through hole (or slit) in the protruding portion 50a and the strip conductor 53,
.. Are different from those in FIG.

That is, in FIGS. 9A and 9B, similarly to the antenna device using the strip line shown in FIG. 5 or FIG.
A slit or a plurality of through holes is formed in a portion of the protruding portion 50a which is not located in a direction opposite to the above.

In FIG. 9A, the switch terminal (strip conductor 5) of the sector switch 55 shown in FIG.
3) and strip conductors 53, 53,.
Are tilted counterclockwise by a predetermined angle, so that the switch terminals and the strip conductors 53, 5
, Are formed as thin films. FIG. 9 (b)
, Without changing the position of the switch terminal of the sector switch 55 shown in FIG. 7 (near the other end of the strip conductor 53), only the strip conductors 53, 53,. The strip conductors 53, 53,... Are each formed as a thin film so as to be inclined.

As described above, according to the antenna device using the stripline according to the ninth embodiment of the present invention, the through-hole () is formed at the protruding portion 50a located in the direction opposite to the maximum radiation direction R of the microwave. Since no slit is formed, the effect of the through hole (or slit) on the antenna characteristics can be reduced as compared with the antenna device using the strip line according to the seventh embodiment.

<Tenth Embodiment> Next, a tenth embodiment of the present invention will be described.
The configuration of the antenna device using the stripline according to the embodiment will be described with reference to FIGS. FIGS. 10A and 10B are rear views showing the configuration of the antenna device using the stripline according to the tenth embodiment. In FIGS. 10A and 10B, FIG.
Parts corresponding to those in FIG. 8 are denoted by the same reference numerals, and description thereof is omitted. 10A and 10B, the through holes (or slits) in the protruding portion 50a, the formation positions of the strip line 56, the 1/4 wavelength matching circuit 57, and the like are different from those in FIG.

That is, in FIGS. 10 (a) and 10 (b), similar to the antenna device using the stripline shown in FIG. 5 or 6, the protrusion which is not located in the direction opposite to the maximum radiation direction R of the microwave. A slit or a plurality of through holes is formed in the portion of the portion 50a.

In FIG. 10A, the switch terminals of the sector switch 55 (near the other end of the strip conductor 56), the strip lines 56, 56,.
.. And the antenna elements 58, 58,... Are tilted by a predetermined angle in the counterclockwise direction in the figure, so that the switch terminals, the strip lines 56, 56,. , 57,... Are each formed as a thin film. In FIG. 10B, the position of the switch terminal (near the other end of the strip conductor 56) of the sector switch 55 shown in FIG.
, And 、 wavelength matching circuits 57, 57,... Are tilted by a predetermined angle counterclockwise in FIG. Circuit 5
7, 57,... Are each formed as a thin film.

As described above, according to the antenna device using the stripline according to the tenth embodiment of the present invention, the through-hole () is formed in the protruding portion 50a located in the direction opposite to the maximum radiation direction R of the microwave. Since no slit is formed, the effect of the through-hole (or slit) on the antenna characteristics can be reduced as compared with the antenna device using the strip line according to the eighth embodiment.

[0070]

As described above, according to the first aspect of the present invention, the through hole is formed in the projecting portion,
Since the thickness of the dielectric viewed from the strip conductor can be regarded as being constant over the entire region, the characteristic impedance can be kept constant over the entire region. Therefore,
According to the first aspect of the present invention, the reflection and loss of electromagnetic waves as transmission media can be reduced even when a very thick protrusion is present in the dielectric. Also,
According to the second aspect of the present invention, since the plurality of slits are formed in the protruding portion, the thickness of the dielectric as viewed from the strip conductor can be regarded as being constant over the entire area. , The characteristic impedance can be kept constant. Therefore, according to the second aspect of the invention, the reflection and loss of an electromagnetic wave as a transmission medium can be reduced even when a very thick protrusion is present in the dielectric. According to the third, seventh, and eighth aspects of the present invention, the thickness of the dielectric can be regarded as being electrically constant over the entire area. Acts as a ground plane. Therefore, according to the invention described in claims 3, 7, and 8,
Compared to a conventional triplate-structured antenna device, it can be easily manufactured with a small number of molds even when manufactured by molding. According to the fourth and ninth aspects of the present invention, since the through hole is formed at a position that does not overlap the direction opposite to the maximum radiation direction of the radio wave radiated from the antenna element, the through hole gives an antenna characteristic. The effect can be reduced. According to the fifth, tenth and eleventh aspects of the present invention, since the plurality of slits are formed in the protruding portion, the thickness of the dielectric as viewed from the strip conductor is regarded as being constant over the entire area. Therefore, the characteristic impedance can be made constant over the entire area. Therefore, according to the fifth, tenth, and eleventh aspects of the present invention, since the slits are provided, even if a very thick protrusion is present in the dielectric, the reflection of the electromagnetic wave as the transmission medium is prevented. And loss can be reduced. According to the sixth and twelfth aspects of the present invention, since the slit is formed at a position that does not overlap with the direction opposite to the maximum radiation direction of the radio wave radiated from the antenna element, the effect of the slit on the antenna characteristics is reduced. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a strip line according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an antenna device using a stripline according to a second embodiment.

FIG. 3 is a perspective view showing a configuration of a strip line according to a third embodiment.

FIG. 4 is a diagram showing a configuration of an antenna device using a stripline according to a fourth embodiment.

FIG. 5 is a diagram showing a configuration of an antenna device using a stripline according to a fifth embodiment.

FIG. 6 is a perspective view showing a configuration of an antenna device using a strip line according to a sixth embodiment.

FIG. 7 is a rear view showing the configuration of the antenna device using the stripline according to the seventh embodiment.

FIG. 8 is a rear view showing the configuration of the antenna device using the stripline according to the eighth embodiment.

FIG. 9 is a rear view showing the configuration of the antenna device using the stripline according to the ninth embodiment.

FIG. 10 is a rear view showing the configuration of the antenna device using the stripline according to the tenth embodiment.

FIG. 11 is a diagram showing a configuration of a conventional strip line.

FIG. 12 is a diagram showing a configuration of a conventional strip line.

FIG. 13 is a side view showing a configuration of an antenna device using a conventional strip line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 30 dielectric 30a protrusion 30b surface 30c through hole 30d back 30e through hole 31 base plate 31a opening hole 32 reflector 33 strip conductor 34 antenna element 40 dielectric 40a protrusion 40b surface 40c slit 40d back 41 base plate 42 reflector REFERENCE SIGNS LIST 44 Antenna element 45 Director 50 Dielectric 50 a Projecting part 51 Ground plane 52 Reflector 53 Strip conductor 54 Antenna element 55 Sector switch 56 Strip line 57 1/4 wavelength matching circuit 58 Antenna element

Claims (12)

[Claims] 1. A surface having a substantially plate-shaped protrusion, and a through-hole having a first width is formed at a root portion of the protrusion, and a lower surface of the through-hole and the surface are formed. A substantially plate-shaped dielectric made into the same plane, a ground plate in which a conductor is formed as a thin film on the entire surface of the dielectric and the lower surface of the through hole, and a base plate located below the through hole. A strip line, comprising: a conductor on a back surface of the dielectric; and a strip-shaped strip conductor formed by forming a thin film so that a second width is smaller than the first width. 2. A substantially plate-shaped dielectric having a substantially plate-shaped protrusion on the surface thereof, and a plurality of slits formed at predetermined intervals in the protrusion, A ground plate in which a conductor is formed as a thin film on the whole surface of the protrusion and a strip-shaped strip conductor in which a conductor is formed as a thin film on the back surface of the dielectric so as to be located below the protrusion. A strip line characterized by: 3. A surface having a substantially plate-shaped protrusion, and a through hole having a first width is formed at a root portion of the protrusion, and a lower surface of the through hole and the surface are formed. A substantially plate-shaped dielectric made into the same plane, a ground plate in which a conductor is formed as a thin film on the entire surface of the dielectric and the lower surface of the through hole, and a base plate located below the through hole. A strip-shaped strip conductor formed by forming a thin film so that a second width of the conductor is smaller than the first width; and a dielectric strip so as to be located in front of the protrusion. An antenna device using a strip line, comprising: an antenna element that is vertically installed at a lower end thereof and whose lower end is electrically connected to the strip conductor. 4. The strip line according to claim 3, wherein the through hole is formed at a position that does not overlap a direction opposite to a maximum radiation direction of a radio wave radiated from the antenna element. Antenna device. 5. A substantially plate-shaped dielectric having a substantially plate-shaped protrusion on the surface thereof and a plurality of slits formed at predetermined intervals in the protrusion, A ground plate in which a conductor is formed as a thin film on the entire surface and the surface of the protrusion; a strip-shaped strip conductor in which a conductor is formed as a thin film on the back surface of the dielectric so as to be located below the protrusion; An antenna device using a stripline, comprising: an antenna element vertically suspended from the dielectric so as to be located in front of the portion, and an antenna element having a lower end electrically connected to the strip conductor. 6. The strip according to claim 5, wherein the plurality of slits are formed only at positions that do not overlap with a direction opposite to a maximum radiation direction of a radio wave radiated from the antenna element. An antenna device using a line. 7. A thick cylindrical projection on the surface thereof,
A plurality of through-holes each having a first width are formed in a plurality of equally-spaced portions at the base of the protruding portion, and the lower surface and the surface of the through-hole are flush with each other. A ground plate in which a conductor is formed as a thin film on the surface of the dielectric and the surface of the protruding portion; each of the dielectric plates being positioned below the plurality of through holes, and radially extending radially from the center of the dielectric A plurality of strip-shaped strip conductors each formed by forming a thin film such that a second width of the conductor is smaller than the first width so that the conductor extends on the back surface of the dielectric; And a plurality of antenna elements each of which is vertically suspended from the dielectric so as to be positioned at each of the plurality of strip conductors, and each lower end of which is electrically connected to the plurality of strip conductors. Antenna device. 8. The strip line according to claim 7, further comprising a plurality of quarter-wave matching circuits interposed between the plurality of strip conductors and the plurality of antenna elements. An antenna device using the same. 9. The plurality of through-holes are formed at positions that do not overlap with a direction opposite to a maximum radiation direction of radio waves respectively radiated from the plurality of antenna elements. An antenna device using the strip line described in (1). 10. A substantially plate-shaped dielectric having a thick cylindrical protrusion on the surface thereof, and a plurality of slits formed in a circumferential direction at a plurality of positions on a root portion of the protrusion in a circumferential direction. A body, a ground plate on which a conductor is formed as a thin film on the surface of the dielectric and the surface of the protrusion, each of which is located below each of the plurality of slits and extends radially from the center of the dielectric in a radial direction As described above, a strip-shaped strip conductor in which a conductor is formed on the back surface of the dielectric material in a thin film form, and the dielectric material is vertically disposed so as to be located in front of the protruding portion, and each lower end has the lower end. An antenna device using a strip line, comprising: a plurality of antenna elements electrically connected to a plurality of strip conductors, respectively. 11. The stripline according to claim 10, further comprising a plurality of quarter-wave matching circuits interposed between the plurality of strip conductors and the plurality of antenna elements. An antenna device using the same. 12. The apparatus according to claim 10, wherein each of the plurality of slits is formed at a position that does not overlap with a direction opposite to a maximum radiation direction of a radio wave radiated from each of the plurality of antenna elements. An antenna device using the strip line described in (1).