JPH0789603B2 - Waveguide slot array antenna - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a waveguide-type slot array antenna formed by forming slots in a rectangular waveguide.

[Conventional technology]

A conventional rectangular waveguide slot array antenna is disclosed in
As described in JP-A-55-85108 and JP-A-58-123205, a power supply unit and a power distributor connected to it,
The phase shifter controls the phase of the signal fed to the waveguide according to the amount of phase shift in the power divider, and the radiating element (slot) that radiates the signal is disclosed in JP-A-55-85108. Japanese Patent Laid-Open No. 58-123205 discloses a positional relationship in which a power distributor is three-dimensionally stacked with a radiation waveguide having a slot formed therein. It is an example provided in.

[Problems to be solved by the invention]

The above-mentioned conventional technique has the following problems because it has a configuration in which a plurality of radiation waveguides are connected to the power distributor. That is, (1) in order to evenly distribute power to each radiation waveguide and obtain a desired antenna pattern, it is necessary to finely control the direction of the feeding slot and to provide a complicated configuration such as providing a phase shifter. Become. (2) Since many feeding slots are provided in the feeding waveguide, the electromagnetic field distribution in the waveguide is disturbed, and the electromagnetic waves fed to each radiation waveguide are likely to be out of phase.

Further, particularly in JP-A-55-85108, there is a problem that the antenna becomes large in area because the feeding waveguide and the radiation waveguide are on the same plane.

The present invention has an object to solve the above-mentioned problems of the prior art, and an object of the present invention is to make it possible to distribute a uniform power having a uniform phase to each radiation waveguide in a small size. Moreover, it is another object of the present invention to provide a waveguide antenna device that radiates uniform radio waves having the same phase from any position.

[Means for solving problems]

In order to achieve the above object, the present invention employs the following technical means. That is, (1) by arranging the power distributor and the power supply unit on the back side of the radiation waveguide to form a three-dimensional structure, the area is reduced. (2) The power is distributed by a two-division system from the feeding point, and the distribution destination is further divided into two. By repeating the two distributions, a required number of distribution destinations are obtained, and thus, All the distribution destinations finally obtained are at the same distance from the feeding point, and the phase is not disturbed. (3) The radiation waveguide has one end serving as a feeding end and the other end serving as a non-reflecting end filled with a radio wave absorber. (4) For a plurality of parallel radiation waveguides, by arranging the radiation waveguides feeding from one end and the radiation waveguides feeding from the other end alternately, as a whole. When seen, it equalizes the intensity of the emitted electromagnetic waves.

[Action]

By arranging the power distributor and the power feeding section three-dimensionally on the back side of the radiation waveguide, the antenna area can be reduced and the gain per unit area can be increased. In addition, the power distribution is a two-division system, and by matching the input phase and the input power to each radiation waveguide as a distribution destination, good electromagnetic waves of the same phase and size from each slot of the radiation waveguide can be obtained. Radiates. In addition, good radiation characteristics can be obtained by terminating the other end of the power feeding end without reflection.

Further, by alternately arranging the radiation waveguide that feeds from one end and the radiation waveguide that feeds from the other end in parallel, the intensity of electromagnetic waves radiated from each part of the antenna is made uniform. In this case, the radiating waveguide that feeds from one end and the C-shaped slot provided in the radiating waveguide that feeds from the other end can be inverted from one to the other. Gives a good circularly polarized radiation signal.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a circularly polarized radiation antenna as an embodiment of the present invention.

This antenna is composed of conductor plates 1 and 11 and a metal block 3. Rectangular grooves 4 and 5 of equal length are formed on one surface of the metal block 3, and the surface (front surface) of the conductor plate 1 is an H surface by bringing the conductor plate 1 into close contact with the surface 9 of the metal block 3. The waveguides 4 and 5 that are (planes parallel to the electric field) are configured.
In the conductor plate 1, n slots (2-1) to (2-n) are cut in the H surface of the waveguides 4 and 5.

On the other surface (back surface) 10 of the metal block 3, a T-shaped groove is formed by a groove 7 perpendicular to the tube axis direction of the waveguides 4 and 5 and a groove 6 orthogonal to the midpoint of the groove 7. By bringing the conductor plate 11 into close contact with the surface 10 of the metal block 3,
The waveguides 6 and 7 whose surfaces are the E-planes (planes perpendicular to the electric field) constitute E-plane T-branch waveguides.
At this time, the waveguides 4, 5, 6 and 7 are waveguides having the same sectional shape.

Further, the E surface at both ends of the waveguide 7 and the H surface at one end of the waveguides 4 and 5 are penetrated. The other ends of the waveguides 4 and 5 are terminated by a terminating resistor 12 without reflection.

FIG. 2 is a supplementary view of FIG. 1 and is a perspective view of an essential part viewed from the conductor plate 11. A circular polarization slot waveguide antenna having an opening 8 at one end of the waveguide 6 as a feeding portion, the waveguides 6 and 7 as feeding waveguides, and the waveguides 4 and 5 as radiation waveguides I am configuring.

FIG. 3 is a sectional view taken along the line AA ′ in FIG. A radiation waveguide 4 formed by closely attaching the conductor plate 1 to the surface 9 of the metal block 3,
A feeding waveguide 6 formed by closely adhering a conductor plate 11 to the surface 5 of the metal block 3 and the metal block 3 has a two-stage structure in the thickness direction.

According to this embodiment, the feeding waveguide is provided below the radiation waveguides 4 and 5.
Since 6 and 7 are installed, the number of radiating slots for the antenna area can be increased compared to the case where the radiating waveguides 4,5 and the feeding waveguides 6 and 7 are installed on the same plane, and the antenna can be downsized or A great effect can be obtained in improving the gain per area.

Further, the lengths of the feeding waveguides (waveguide length) from the feeding portion 8 of the antenna to the radiation waveguides 4 and 5 are equal because the two-division waveguide system is adopted. Since the input power at the input end of the wave tube can be made uniform and the incident phase is correctly shifted by 180 °, the array of radiating elements (slots) can be shifted by λ _g / 2 (λ _g is the guide wavelength). The turbulence of the electromagnetic field in the radiation waveguides 4 and 5 is small, and it is possible to radiate a uniform electromagnetic wave with small phase disturbance from each radiating element and obtain a good circular polarization.

Further, although the waveguide portion is made of metal in the present embodiment, the member is not limited to metal, and for example, as will be described later, the portion that becomes the waveguide wall is plated with metal. The same effect can be obtained by using a member such as plastic.

FIG. 4 shows a radiating element (slot) used in the present invention.
A specific example of the shape will be shown.

In FIG. 4, the same parts as those in FIGS. 1 and 3 are designated by the same reference numerals and the description thereof is omitted. In FIG.
Reference numerals 20 and 21 denote power supply units, respectively, and the power supply unit 21 has a reverse phase (180 ° phase shift) relationship with the power supply unit 20. 22 is a radiation waveguide (the figure shows the H-plane of the waveguide).

FIG. 4 (a) shows the shape of the radiating element when right-handed circularly polarized light is radiated when one end portion of the plurality of radiation waveguides 22 is fed from the feeding portions 20 and 21 in reverse phase. . The radiating element uses the first slot (2-1) with π / 4 (45
°) Tilt the first slot (2-1) and the second slot
Slots (2-2) of λ _g / 4 are provided so as to be substantially perpendicular to each other, and the first slot (2-1) and the second slot (2-2) are set as a set. , Λ _g are provided with a plurality of sets of slots. This example shows two radiating waveguides
In order to feed the power to the antenna 22 in the opposite phase, the radiating elements (2-1 ') to (2-n') of the power feeding waveguide 22 to be fed by the power feeding portion 21 are connected to (2-1) to (2-.
It is arranged with a shift of λ _g / 2 from n).

With this radiating element shape, in-phase signals can be radiated from the two radiating waveguides 22.

FIG. 4B shows the radiation waveguide 22 in phase with one radiation waveguide from one end and the other radiation waveguide from the other end. The shape of the radiating element when radiating with the right-handed circularly polarized wave fed is shown.

The shape of the radiating element in this case is such that the distances a from each feeding end to the first slots (2-1) and (2-1 ″) are equal, and feeding is performed from the end opposite to that in FIG. 4 (a). In such a radiation waveguide, the first slot (2-1 ″) is inclined by π / 4 (45 °) with respect to the traveling direction of the electromagnetic wave, and the first slot (2-1 ″) is inclined. ) To the second slot (2-2 ″) by λ
_g / 4, the first slot (2-1 ″) and the second slot (2-2 ″) are set as one set, and a plurality of sets of slots are provided at intervals of λ _g .

That is, in the two waveguides 22 shown in FIG. 4 (b),
The slots are formed in a V shape on one side and an inverted C shape on the other side, and the first slots (2-1) and (2-1 ″) are provided from each feeding end.
To be equal to each distance a.

FIG. 4 (c) shows two radiation waveguides 22 with respect to one radiation waveguide from one end and the other radiation waveguide from the other end. The figure shows the shape of the radiating element when radiating in the right-handed circularly polarized wave fed in the opposite phase. In this case, the shape of the radiating element is such that, when the distance from the feeding end to the first slot (2-1) is a, the other feeding end is connected to the first slot (2-1).
) Is _defined as a + (λ _g / 2) and the second slot (2
-2) and subsequent steps are arranged at the intervals shown in Fig. 4 (b).

In the radiating element shapes shown in FIGS. 4 (b) and 4 (c), circularly polarized signals are radiated from the respective radiating waveguides 22, the intensity thereof is strong near the feeding point, and the closer to the terminating end of the radiating waveguide. Since it becomes weaker, almost uniform radiation intensity can be obtained in the plane of the antenna.

Next, FIG. 5 shows a specific example of the shape of the radiating element when radiating a linearly polarized signal. In FIG. 5, parts having the same functions as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 5 (a) shows the shape of the radiating element in the case of radiating linearly polarized waves when power is supplied to one end of the plurality of radiation waveguides 22 from the power feeding section 20 or 21 in reverse phase. Slot (2-1)
(2-n) are arranged on the H plane in parallel with the traveling direction of the radio wave, and the distance between the first slot (2-1) and the second slot (2-2) is λ _g . In a radiation waveguide fed in reverse phase, one position of the first slot (2-1 ') is relatively displaced from the position of the first slot (2-1) by λ _g / 2. To do. With this radiating element shape, linearly polarized waves of the same phase can be radiated.

FIG. 5B shows the shape of the radiating element when the specific example of FIG. 4C is used for linearly polarized waves. The shape of the radiating element in this case is that the distance from the feeding end to the first slot (2-1) is a
Then, from the other feeding end to the first slot (2-
The distance to 1 ″) is a + (λ _g / 2), and the second slot (2-2 ″) and thereafter are arranged at intervals of λ _g . Due to this shape of the radiating element, in-phase linearly polarized waves can be obtained with substantially uniform radiation intensity in the radiation plane.

FIG. 6 shows another embodiment of the present invention, that is, an embodiment in which four slot waveguide antennas are arranged in parallel, in other words, an embodiment corresponding to a case where two sets of the embodiment in FIG. 1 are arranged. Here is an example.

FIG. 6 (a) is a view as seen from the side of the antenna radiating element, and the slots formed on the H surface of the waveguides 4, 5, 4 ', 5'are the same as in FIG. 4 (a), and One end of each of the wave guides 4, 5, 4'and 5'is non-reflectively terminated by a terminating resistor 12 to form a radiation waveguide.

FIG. 6 (b) is a view as seen from the surface opposite to the radiation surface 1 of the above antenna, and the waveguide 7, the radiation waveguides 4 and 5, and the waveguide 7 '.
The radiation waveguides 4'and 5'through the same as in the case of FIG. At the midpoint of the waveguides 7 and 7 ', the waveguides 7 and 7'are orthogonal to the waveguides 6 and 6'having the E-planes, and an E-plane T-branch waveguide is constructed. The other ends of the waveguides 6 and 6'are connected to the waveguides 6 and 6 '
It is connected to both ends of a waveguide 30 whose surfaces are aligned. At the midpoint of the waveguide 30, the termination short-circuit waveguide 31 in which the E-plane is aligned with the waveguide 30
Are orthogonal to each other to form an E-plane T-branch waveguide. Further, as shown in FIG. 6 (c), a window 32 is formed in the conductor plate 11 above the terminal end of the waveguide 31, and the window 32 serves as the opening surface of the feed waveguide and the circular polarization slot waveguide. A tube antenna is constructed.
The waveguides all have the same cross-sectional shape.

FIG. 6 (c) is a sectional view taken along line BB 'in FIGS. 6 (a) and 6 (b).

The embodiment shown in FIG. 6 is the same as the embodiment shown in FIG.
The one arranged in parallel corresponds to this, and the gain per antenna area is large due to the three-dimensional two-stage structure in which the feeding waveguide is arranged below the radiation waveguide as in the case of FIG. In addition, since the feeding waveguide is configured by two distribution waveguides having the same waveguide length from the antenna feeding section 32 to the radiation waveguides 4, 5, 4 ', 5', The input power can be equalized at the tube input end, and good circular polarization can be obtained because radiation can be performed in phase due to the shape of the radiation element.

Further, although the power feeding window 32 is provided on the back surface of the antenna, the same effect can be obtained by extending the waveguide 31 and providing the power feeding window 32 on the side surface of the antenna.

FIG. 7 shows an embodiment in which the present invention is applied to an antenna that feeds power from both sides in the tube axis direction in a slot waveguide antenna.

FIG. 7 (a) is a view as seen from the radiating element side of this embodiment. The slots formed on the H surface of the waveguides 4, 5, 4 ″, 5 ″ are the same as those in FIG. The waveguides 4 and 5 and 4 "and 5" are guided to the waveguides 4 and 5 by the arrangement of the waveguides 4 and 4 "and 5 and 5" in FIG. 4 (a), respectively. The wave tubes 4 "and 5" are arranged such that the feeding directions are opposite and the feeding directions are alternated, and each waveguide is non-reflection terminated by a terminating resistor 12 to form a radiation waveguide.

FIG. 7 (b) is a view seen from the surface opposite to the radiation surface of the antenna. One end of the waveguides 4 and 5, the waveguide 7, and one end of the waveguides 4 ″ and 5 ″ and the waveguide 7 ″ are penetrated as in the case of FIG. At the midpoint of the ″, the waveguides 7 and 7 ″ are orthogonal to the waveguides 6 and 6 ″ whose E faces are aligned to form an E-plane T-branch waveguide. The other end of the waveguide 6,6 ″ is the waveguide 6,6 ″
And E surfaces are aligned and connected to the waveguide 30 orthogonal to the waveguides 6, 6 ″. A window 32 is formed in the conductor plate 11 at the midpoint of the waveguide 30 so that the window 32 is formed.
32 becomes the opening of the feed waveguide, and a circular polarization slot waveguide antenna is constructed.

The waveguides 6 and 6 ″ have the same waveguide length, and all the waveguides have the same sectional shape.

FIG. 7 (c) shows a section taken along CC 'in FIGS. 7 (a) and 7 (b). This embodiment has a large gain per antenna area because it has a three-dimensional two-dimensional structure in which the feeding waveguide is arranged below the radiation waveguide as in the embodiment shown in FIG. In addition, since the feeding waveguide is composed of two distribution waveguides having the same waveguide length from the antenna feeding portion 32 to the radiation waveguides 4, 5, 4 ″, 5 ″, The input power at the tube input end can be made uniform, and in-phase radiation can be performed due to the shape of the radiating element.Because power is fed from both sides in the tube axis direction of the antenna, the electric field above the antenna is uniform and good circular polarization can be obtained. it can.

Further, although the feeding window 32 is provided on the back surface of the antenna, the same effect can be obtained by extending the waveguide 31 and providing the feeding window 32 on the side surface of the antenna.

Further, when the feeding window 32 is directly provided on the waveguide 30, the radiating element shapes are changed to the radiating waveguides 4 and 4 ″ and 5 and 5 ″ because the waveguides 6 and 6 ″ have opposite phases. The same effect can be obtained by arranging the radiation waveguides 4 and 5 and 4 ″ and 5 ″ shown in FIG. 4 (b) in the arrangement shown in FIG. 4 (a).

Further, the radiation waveguides feeding from one end and the radiation waveguides feeding from the other end are not provided alternately, but the radiation waveguides 4 ″ and 5 have one end, for example. When the power is supplied to the radiation waveguides 4 and 5 ″ from the other end, the portion where the waveguide 31 intersects the waveguide 30 is provided at an appropriate position, and the radiation window 32 is provided. The same effect can be obtained by making the distances to the feeding ends of the respective radiation waveguides equal.

Next, another embodiment is shown in FIG. No. 6 in FIG.
Parts having the same functions as those in FIG. 7 and FIG. 7 are given the same numbers and their explanations are omitted. In the figure, 40, 40 ', 41, 4
1'is a midpoint-fed radiation waveguide.

FIG. 8 (a) is a view as seen from the radiating element side of this embodiment, and the slots formed on the H surface of the radiating waveguides 40, 40 ', 41, 41' are the slots described in FIG. The shape of the radiation waveguide 40, 40 ',
The center point of 41, 41 'is placed as the center.

FIG. 8 (b) is a view seen from the side opposite to the radiation surface of the antenna, showing the midpoints of the radiation waveguides 40 and 40 'and the midpoint of the waveguide 7 and the radiation waveguides 41 and 41'. The wave tube 7 is penetrated as in the case of FIG. The configurations of the branch, the power supply window, etc. are the same as in the case of FIG.

FIG. 8 (c) shows a cross section taken along the line DD 'of this embodiment. In this embodiment, the same effect as that of the embodiment shown in FIG. 7 can be obtained.

Although the waveguide portion is made of metal in the above-described embodiments, the member is not limited to metal.

An embodiment of another structure not based on metal is shown in FIG. In the figure, 50, 51, 52 are molding materials such as plastics, 53, 5
4,55 are metal plating parts. A radiating element shape is formed by punching or the like in the molding material 50, a rectangular groove for a waveguide is molded in the molding material 51, and a feed opening is formed in the molding material 52.

Metal plating 53, 54, 55 is applied to these molding materials 50, 51, 52. The thickness of the metal plating 53, 54, 55 is about several times the skin depth corresponding to the frequency used. The waveguide-type slot array antenna is configured by bringing the members thus configured into close contact with each other by crimping or the like.

In the present embodiment, since a material such as plastic which is lightweight and excellent in workability is used and the surface of the material is plated with metal, there is an effect that the material is lightweight, easy to manufacture, and inexpensive. In this embodiment, the molding material is 50, 51, 52.
However, the division is not limited to this.

An example thereof is shown in FIG. In the figure, the same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof is omitted.

FIG. 10 shows an example of division into four parts 1, 3, 3'and 11. As shown in FIG. 9, each part is formed of plastic or the like as described with reference to FIG. 9, and is plated with metal to form a waveguide-type slot array antenna, which is adhered by crimping or the like. The same effect as that of the embodiment can be obtained.

The method of constructing the four parts 1, 3, 3 ', 11 is not limited to this. For example, a conductive thick film is printed (or a conductive layer is provided) in a multilayer substrate using a dielectric such as ceramic. ,
It is also possible to have a structure in which upper and lower layers are connected by through holes or the like. In this case, since a plurality of layers are collectively formed by sintering, a method such as crimping is not required, and a lightweight and inexpensive waveguide slot array antenna can be easily configured.

Next, FIG. 11 shows a specific structural example of the power feeding unit. Similar to FIG. 2, this figure is a perspective view seen from the opposite side of the antenna radiation surface. The same parts as those in FIGS. 2 and 6, 7, and 8 are designated by the same reference numerals and described. For short.

In FIG. 11, 60 is a converter (or waveguide),
61,62,63,64,61 ′, 62 ′, 63 ′, 64 ′, 61 ″, 62 ″, 63 ″, 6
4 ″ is a screw hole respectively, and 65 is a flange. The metal block 3 is provided with a feed waveguide 6, a groove and a through hole for the branching portion 7, and a flange 65 of the converter or the waveguide 60 is fixed to the four sides of the opening 8. Screw holes 61, 62, 63, 64 are provided for the conductor plate 1.
A feed opening window 32 having the same sectional shape as the waveguide is provided in 1 with screw holes 61 ', 62', 63 ', 64' for fixing the flange 65.

In this way, the converter or waveguide 60
Can be fixed by screws that are inserted into the screw holes 61 ″, 62 ″, 63 ″, 64 ″ of the flange 65 to supply power.

Next, FIG. 12 shows a specific example of the antenna radiation surface. In the figure, 70 is a dielectric substrate such as Teflon, 71 is a conductor layer, and 72
Is a member made of the plastic molding material 51, 54 in FIG. 9, (2-1) to (2-n) are radiation slots, and 11 is a conductor plate 11 having a feed opening.

The conductor layer 71 is formed on one surface of the dielectric substrate 70, and the conductor layer 71 is formed.
Slots (2-1) to (2-n) are provided by etching or the like, and the conductor layer 71 is brought into close contact with the member 72 to form a radiation waveguide.

According to this example, it is possible to prevent rainwater and the like from leaking into the radiation waveguide from the slot provided on the antenna radiation surface, and by using a light and easy-to-mold material such as plastic for the member 72, It has excellent workability and is lightweight, and since the conductor plate 11 for attaching the converter or the power feeding waveguide uses a conductor such as metal, it has an effect that sufficient attachment strength can be obtained.

In the embodiments described above, the circularly polarized radiation element shape shown in FIG. 4 was mainly used, but the same effect can be obtained by using the linearly polarized radiation element shape shown in FIG. To be

It is known that the bent portion of the waveguide has better characteristics when it is bent with an appropriate radius of curvature, and in the above embodiments, the bent portion due to branching of the waveguide has an appropriate radius of curvature. I am holding it.

〔The invention's effect〕

According to the present invention, because of the three-dimensional multilayer structure in which the feeding waveguide is arranged on the side opposite to the radiation surface of the radiation waveguide of the circular polarization slot waveguide antenna, the antenna area of the slot waveguide antenna is Since the area of the radiation portion can be widened, the antenna gain can be increased.

In addition, since the power is supplied to each of the 2 ⁿ (n ≧ 1) radiation waveguides by the two-partitioning method in which the lengths of the feeding waveguides are made equal, uniform power can be supplied to the radiation waveguides. By appropriately selecting the arrangement, the electromagnetic wave with small phase disturbance can be radiated from each slot of the radiating waveguide, and since the power can be fed from both sides of the antenna, the size of the radiated electromagnetic wave can be made uniform on the antenna surface. It is also possible to improve the radiation efficiency of the antenna, and good circular polarization can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view supplementing the drawing, FIG. 3 is a sectional view taken along the line AA ′ of FIG. 1, and FIGS. 4 and 5 are explanatory views showing specific examples of the shape of the radiating element used in the present invention. 7 and 8 are explanatory views showing another embodiment of the present invention and FIG. 9 respectively.
FIG. 10 and FIG. 10 are cross-sectional views showing another structural example that can be adopted as an embodiment of the present invention, FIG. 11 is an assembled perspective view of a power feeding portion in the embodiment of the present invention, and FIG. 12 is an embodiment of the present invention. 3 is a perspective view showing a specific example of an antenna radiation surface in FIG. Explanation of symbols 1 ... Conductor plate, (2-1) to (2-n) ... Slot, 3 ...
Metal block, 4,5 ... Radiation waveguide, 6,7,30,31 ... Feeding waveguide, 11 ... Conductor plate, 50,51,52 ... Molding material such as plastic, 53,54, 55 …… Metal plating, 61,62,63,64 ……
Screw hole, 65 ... Flange, 70 ... Dielectric substrate, 71 ... Conductor layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Yamamoto 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside the Home Appliance Research Laboratory, Hitachi, Ltd. (72) Inventor Keiro Shinkawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Home Appliance Research Laboratory, Hitachi, Ltd.

Claims (5)

[Claims] 1. A first radiation slot array consisting of a plurality of slots (2-1, 2-2, 2-n) formed by 2 ^m rows (m is an arbitrary integer).
Conductor plate (1) and the front surface (9) of the metal block (3) having front and back surfaces
2 ^m square grooves (4,4 ', 5,5') are provided on the rear surface, and one end of the linear groove (6) is branched into two to form a T-shape on the back surface (10). , Each of the two bifurcated tips further bifurcates to form a T-shape, and by repeating the bifurcation of m times, a repeating T-shaped rectangular shape with 2 ^m tips is obtained. grooves (6,6 ', 7,7') is formed, and each of the 2 ^m pieces of rectangular grooves formed on the surface, 2 ^m pieces of the tip of the repeated T-shaped rectangular grooves provided on the back surface And a second conductor plate (11), the metal blocks (3) formed by joining the metal blocks corresponding to each other with a groove penetrating from the front surface to the back surface of the metal block, and the first conductor plate (11). The conductor plate (1) and the surface of the metal block (3) are brought into close contact with each other by associating each of the 2 ^m rows of radiating slots with each of the 2 ^m square grooves. By the above 2 ^m
Each of the square grooves is used as a radiation waveguide, and the second conductor plate (11) and the back surface of the metal block (3) are brought into close contact with each other to repeatedly have the 2 ^m tips. The T-shaped rectangular groove serves as a power distribution waveguide for power supply, and the other end of the linear groove (6) is connected to the power supply opening (8,
32) A waveguide type slot array antenna, characterized in that 2. The waveguide type slot array antenna according to claim 1, wherein the metal block (3) is provided.
Of the 2 ^m square grooves provided on the front surface of the metal block and the 2 ^m tips of the repeating T-shaped rectangular grooves provided on the back surface of the metal block, When connecting with a groove that penetrates from the front surface to the back surface, of the left and right ends of each of the 2 ^m rectangular grooves, at the end on the same one side of the 2 ^m rectangular grooves, A waveguide-type slot array antenna, characterized in that each of them is coupled to each of the 2 ^m tips, and the other end of the other side is made a non-reflection termination. 3. The waveguide type slot array antenna according to claim 1, wherein the metal block (3) is provided.
Of the 2 ^m square grooves provided on the front surface of the metal block and the 2 ^m tips of the repeating T-shaped rectangular grooves provided on the back surface of the metal block, When connecting with a groove penetrating from the front surface to the back surface, for each of the 2 ^m rectangular grooves, of the end portions on both the left and right sides of the groove, the end portions on different sides are alternately joined, and A waveguide type slot array antenna, characterized in that its ends are non-reflective terminations. 4. The waveguide type slot array antenna according to claim 1, wherein one or more of the first conductor plate, the metal block, and the second conductor plate are made of plastic. A waveguide type slot array antenna, characterized in that the surface of such a molding material is plated with metal. 5. The waveguide type slot array antenna according to claim 1, wherein the first conductor plate is a dielectric substrate provided with a conductor layer on a surface in close contact with the metal block. A waveguide type slot array antenna, comprising: a dielectric substrate having a row of radiation slots formed by separating a part of the conductor layer from the dielectric substrate.