JPH04105404A - Feeding circuit for waveguide slot antenna - Google Patents

Abstract

PURPOSE:To easily manufacture the circuit coupling power readily by butting an H plane of a feeding waveguide to a termination face of a radiation waveguide array comprising lots of radiation waveguides each having a radiation slot and feeding each radiation waveguide through an E plane branch. CONSTITUTION:Since feeding slots 36 are arranged at an interval of lambdag/2 (lambdag is a guide wavelength of a feeding waveguide 32) in the guide axis direction of the feeding waveguide 32, adjacent radiation waveguides 30 are fed in opposite phase. Thus, a radio wave from an input/output waveguide 34 excites the feeding waveguide 32 through the E-plane branch horizontally in opposite phase. Thus, the direction of the electric field in the inside of the feeding waveguide 32 is a direction as shown in the arrow. Thus, power is fed efficiently to the radiation waveguide, the analysis is simplified and the design and manufacture are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a feeding circuit for a waveguide slot antenna.

[Prior Art] A large number of waveguides each having a large number of radiation slots are arranged side by side.
A waveguide slot antenna that emits radio waves of a predetermined polarization from the radiation slot is well known (for example,
Patent Application No. 37203, 1988, Patent Application No. 1463
92, 1999 Patent Application No. 4876, 1999 Patent No. 6046, 1999 Utility Model Registration Application No. 85690)
.

In such a waveguide slot antenna, it is necessary to feed or excite each radiating waveguide with a predetermined phase relationship, and the feeding circuit for this purpose is a circuit that is perpendicular to the tube axis of the radiating waveguides arranged in parallel. It is known to arrange a feeding waveguide extending in the direction on the side of the radiating waveguide opposite to the side provided with the radiating slot, or at one end of the radiating waveguide. A perspective view of the former is shown in FIG. 3, and a perspective view of the latter is shown in FIG.

FIG. 3 will be briefly explained. 10 is a radiation waveguide with radiation slots 12 opened in one side (H side) according to a predetermined rule, 14
are the radiating waveguides 10, 10 . It is a power supply waveguide that supplies power to... The feed waveguide 14 is coupled to each radiating waveguide 10 via coupling throwers 16 that are tilted alternately in opposite directions with respect to the tube axis of the feed waveguide 14 . Therefore, the feeding waveguide 14 is coupled to each radiation waveguide 10 by an E-plane branch.

FIG. 4 will be briefly explained. The details are described in Patent Application No. 37203 of 1988. 20 or one side (H
a radiation waveguide with radiation slots 22 opened according to a predetermined rule in the surface), a feeding waveguide 24 that excites or feeds power to the radiation waveguide 20, and a feeding probe 26 that excites the feeding waveguide 24;
28 is a coupling slot that couples the radio waves of the feeding waveguide 24 to each radiation waveguide 2o. The radiating slots 22 are arranged antisymmetrically to the adjacent radiating waveguides 20 . The feeding waveguide 24 faces the end surface of the radiation waveguide 20 with an E plane, and the coupling slot 28 is arranged at a distance of 1 of the internal wavelength λg of the feeding waveguide 24.
They are formed at intervals of /4. The feeding waveguide 24 is excited by the feeding probe 26, and the excited radio wave becomes a standing wave.In the structure of each coupling slot shown in FIG. 3, power is fed through the E-plane branch, and the power coupling efficiency is poor. There are some drawbacks. Another disadvantage is that each coupling slot 16 must be formed obliquely with respect to the tube axis of the feeding waveguide 14, which makes analysis, design, and manufacturing difficult. Furthermore, it has the drawbacks of a narrow frequency band and a thick three-dimensional structure.

On the other hand, in the conventional example shown in FIG.
Since the and each radiation waveguide 20 are branched in the IJ plane,
The disadvantage is that it is difficult to split the power.

Furthermore, in the structure of the conventional power supply circuit, the power supply waveguide must be manufactured by a high-cost method such as punching, which has the disadvantage that it cannot be manufactured cheaply.

Therefore, an object of the present invention is to provide a power feeding circuit that can easily couple power.

The invention further aims to provide a power supply circuit that is easy to manufacture.

[Means for Solving the Problems] A feeding circuit for a waveguide slot antenna according to the present invention includes:
The H-plane of the feeding waveguide was brought into contact with the end face of a radiating waveguide array consisting of a large number of radiating waveguides each having a radiating slot, and power was fed to each radiating waveguide through an E-plane branch.

Furthermore, one or more branch waveguides were provided to guide the input radio wave to each feeding waveguide by E-plane branching.

[Function] Since the power feeding from the feeding waveguide to the radiation waveguide is branched in the E plane, power coupling efficiency is improved. Further, since there is no problem even if the feeding waveguide is divided into two along the central axis of the H plane, the feeding waveguide can be manufactured easily.

The provision of branch waveguides also reduces the number of radiating waveguides fed by individual feed waveguides, which simplifies analysis and design.

In addition, since the branch waveguides and the branch waveguide and the feeding waveguide are connected by E-plane branching, the part consisting of the branching waveguide and the feeding waveguide is divided into two as described above. Therefore, it can be manufactured very easily.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a perspective view of an embodiment of the present invention in the case of negative phase feeding, and FIG. 2 shows its waveguide structure.

The arrows in FIG. 2 indicate the direction of the electric field. FIG. 2 corresponds to a cross-sectional view taken along line A-A in FIG. 1. 30 is a radiation waveguide, 32 is a feeding waveguide, and 34 is an input/output waveguide. The well-known radiation slot (not shown) described in the above-mentioned publications and the like is opened in the H surface of each radiation waveguide 30 at a predetermined position and size. The input/output waveguide 34 communicates with the power feeding waveguide 32 through its entire end surface. The feeding waveguide 32 is in contact with the end surface of the radiation waveguide 30 on its long side surface (H surface), and communicates with each radiation waveguide 30 via the feeding slot 36 .

The power feeding slot 36 is provided on the H-plane of the power-feeding waveguide 32 at a position offset from the central axis of the E-plane. The feeding slot 36 also has a width of λ in the tube axis direction of the feeding waveguide 32.
They are arranged at an interval of g/2 (λg is the internal wavelength of the feeding waveguide 32), and as a result, as can be seen from FIG. 2, adjacent radiation waveguides 30 are fed in opposite phases.

The operation of the embodiment shown in FIGS. 1 and 2 will be briefly described. The radio waves from the input/output waveguide 34 excite the feeding waveguide 32 in the left-right direction with opposite phases due to the E-plane branch, and as a result, the direction of the electric field inside the feeding waveguide 32 is as indicated by the arrow in FIG. It will be in the direction shown. Therefore, the second
By coupling the radiation waveguides 30 at intervals of λg/2 as shown in the figure, adjacent radiation waveguides 30 are excited in opposite phases to each other.

Here, the basic operation of a coupling slot for E-plane branching, such as the feed slot 36, will be briefly explained with reference to FIG. A current flows through the wall of the waveguide as shown by the solid arrow in FIG. Therefore, a slot elongated in the axial direction of the waveguide (hereinafter referred to as a "vertical slot" in this specification).
38 needs to be placed at a position offset from the central axis of the 8 planes, and the slot 39, which is elongated in the cross-sectional direction of the waveguide (hereinafter referred to as the "horizontal slot J" in this specification), is
(It is sufficient to arrange it on the center axis of the surface. As can be seen from FIG. 5, the vertical slot 38 and the horizontal slot 39 are offset by λg/4 in the tube axis direction from the position where they should be arranged. The feed slot 36 illustrated in FIGS. 1 and 2 is a vertical slot. Furthermore, the coupling form between the input/output waveguide 34 and the feeding waveguide 32 is basically a horizontal slot.

FIG. 6 is a perspective view of another embodiment of the present invention having a two-stage branch structure with reverse phase power supply, and FIG. 7 is a diagram of its waveguide structure. 7th
The figure corresponds to a sectional view taken along line B-B in FIG. 6. The arrows in FIG. 7 indicate the direction of the electric field.

In the embodiment shown in FIGS. 6 and 7, a branch waveguide is provided between the input/output waveguide and the feeding waveguide, and one feeding waveguide connects the radiating waveguide to which electricity is fed. I try to keep the number small. This simplifies analysis and therefore design and manufacturing.

6 and 7, 40 (40-1..., 4
O-8) is a radiating waveguide with a number of radiating slots (not shown) formed on its eight sides. 42.44 is a feeding waveguide that feeds power to the radiation waveguide 40, 46 is an input/output waveguide,
48 is a waveguide 42 that feeds the radio waves from the human horn waveguide 46.
and a branch waveguide that branches into 44 branches. The input/output waveguide 46 communicates with eight surfaces of the branch waveguide 48 through a coupling slot 47 provided at its terminal end face, and the branch waveguide 48 connects the feed point from the input/output waveguide 44 (coupling slot 47 ) to λg
Via the branch slot 50.52 provided at the position of
They are coupled to feed waveguides 42 and 44, respectively. The branch slots 50, 52 are the transverse slots mentioned above.

Radiation waveguide 40-1. ..., 40-4 communicate with the feeding waveguide 42 via the feeding slots 54, 54, 54, 54, and the radiating waveguides 40-5. ...40-8 communicates with the feed waveguide 44 via the feed slot 56°56.56.56. The feed slots 54, 56 are vertical slots arranged in the same shape and position as the feed slots 36 shown in FIGS. 1 and 2.

In the embodiment illustrated in FIGS. 6 and 7, the input/output waveguide 46 is similar to the feed waveguide 32 illustrated in FIGS. Excite with In the branch slot 5052 provided at a position λg from the feeding point by the input/output waveguide 46, the electric field directions are the same as shown in FIG. Excited. The feed waveguide 42 is connected to the adjacent radiation waveguide 40- by the feed slot 54, which is a vertical slot.
1. ..., 40-4 are excited in opposite phases to each other, and the feeding waveguide 44 excites the adjacent radiation waveguides 40-5..., 40-8 in opposite phases to each other through the feeding slot 56, which is a vertical slot. Excite with

Next, a description will be given of an embodiment in which a three-stage branch structure is used with reverse phase power supply. FIG. 8 is a perspective view thereof, and FIG. 9 shows a waveguide structure. 9th
The figure corresponds to a sectional view taken along line CC in FIG. In Figure 9,
Arrows indicate electric field direction. 58 (58-1, ~, 58-
8) is a radiation waveguide with radiation slots (not shown) opened on eight sides; 60 is a feeding waveguide that feeds power to the radiation waveguide 58-1; 58-2; and 62 is the radiation waveguide 58. -3.58-4
64 is a radiation waveguide 58-558
-6 is a feeding waveguide that feeds power to 6, and 66 is a radiation waveguide 58-7.
．． This is a power feeding waveguide that feeds power to 58-8. 68 is an input/output waveguide, 70, 72, 74 are branch waveguides, and the branch waveguide 70 transfers the radio waves from the input/output waveguide 68 to the branch waveguide 7.
2.74, and the branch waveguide 72 is connected to the feeding waveguide 60.
62, and the branch waveguide 74 is the feeding waveguide 64.66.
Branch into.

A branch slot 76 between the branch waveguide 70 and the branch waveguide 72 is provided at a position λg from the input/output waveguide 68,
A branch slot 78 between the branch waveguide 70 and the branch waveguide 74 is connected to the input/output waveguide 6 in the opposite direction to the branch slot 76.
It is provided at a position λg from 8. Additionally, a branch slot 80 between the branch waveguide 72 and the feed waveguide 60,62
82 are λg/ in opposite directions from the branch slot 76, respectively.
The branch waveguide 74 and the feeding waveguide 6 are arranged at a distance of 2.
The branching slots 84, 86 between the branching slots 4.66 and 4.66 are arranged λg/straddles apart in opposite directions from the branching slots 78, respectively. Branch slot 76, 78, 80, 82, 8
4.86 is the above-mentioned horizontal slot, which has good power coupling efficiency and little disturbance in the phase of radio waves branching in the left and right directions.

The feed waveguide 60 feeds the radiating waveguide 58-1.58-2 through feed slots 8888 spaced λg/4 in opposite directions from the branch slots 80, respectively. Feeding waveguide 62
feeding slots 90, 90 of the feeding waveguide 64, feeding slots 92, 92 of the feeding waveguide 64, and feeding slots 9 of the feeding waveguide 66.
Similarly, branch slots 82, 84 .
It is arranged at a position λg/4 away from 86 in the opposite direction, and feeds power to the radiation waveguides 58-3 to 58-8. The power supply slots 88, 90, 92, and 94 are vertical slots similar to the power supply slot 36.

The branch waveguide 70 is excited by the input/output waveguide 68, and the electric field phases of the branch slots 76 and 78 are the same as before. Therefore, the branch waveguides 72 and 74 are excited in the same phase. Since the branch slots 8082 and 84.86 are located in opposite directions and at the same distance from the branch slots 76.78, the radio waves in the branch slots 80, 82, and 84.86 are all in the same phase and are connected to the feed waveguide 60. ,62,64.6
6 are excited in phase. The feed slot 88, which is a vertical slot, is connected to the branch slot 80 which is a horizontal slot.
Since they are separated by g/4, as can be seen from the explanation of FIG.
88 is maximally anti-phase excited and therefore the radiating waveguide 58
-1.58-2 is excited in opposite phase. Similarly, the radiation waveguides 58-3 to 58-8 are alternately excited in opposite phases.

Next, an example in the case of two-stage branching with in-phase power feeding will be described.

FIG. 10 is a perspective view thereof, and FIG. 11 is a diagram of a waveguide structure.

FIG. 11 corresponds to a cross-sectional view taken along line DD in FIG. 1O. In FIG. 11, arrows indicate the direction of the electric field.

10 and 11, 100 (100-1
, . . . , 100-8) is a radiation waveguide, and has a large number of radiation slots (not shown) in its H-plane. 10
2 is a feeding waveguide that feeds power to the radiation waveguides 100-1 to 100-4; 104 is a feeding waveguide that feeds power to the radiation waveguides 100-5 to 100-8; 106 is an input/output waveguide; Reference numeral 108 denotes a branch waveguide that branches the radio waves from the input/output waveguide 104 into the feeding waveguide 102 and the feeding waveguide 104 . Input/output waveguide 1
06 communicates with the H plane of the branch waveguide 108 at its terminal surface,
The branch waveguide 108 has branch slots 110 and 11 provided at a position λg from the feeding point from the input/output waveguide 106.
2 to feed waveguides 102 and 104, respectively. Branch slots 110, 112 are the transverse slots mentioned above.

The partition wall between the radiation waveguides 100-1 and 100-2 is
A feeding slot 14, which is a vertical slot, is opened in the H-plane of the feeding waveguide 102, which is slightly away from the wall surface of the H-plane of the feeding waveguide 102 and on an extension of the partition wall. Therefore,
The radiation waveguides 1001 and 100-2 are connected to the feeding slot 1.
14 simultaneously, ie in phase. This in-phase feeding structure itself is explained in detail in Patent Application No. 372 (13) of 1988.

Similarly, a feed slot 116 located on an extension of the partition wall between the radiating waveguides 100-3 and 100-4 feeds the radiating waveguides 100-3 and 100-4 with in-phase power. Feed slot 116 is located at λg/4 from branch slot 110, resulting in a maximum electric field at the location of feed slots 114 and 116. Radiation waveguide 100-5 and same 100-
The feed slot 118 that feeds the radiation waveguides 100-7 and 100-8 in phase, and the feed slot 120 that feeds the radiation waveguides 100-7 and 100-8 in phase are also similar to the feed slots 114 and 116.

Note that the power feeding slots 114, 116°, 118, and 120 are the above-mentioned vertical slots.

In the embodiment illustrated in FIGS. 10 and 11, the input/output waveguide 106 is similar to the feed waveguide 32 illustrated in FIGS. Excite with In the branch slots 110 and 112 provided at the position of λg from the feeding point by the input/output waveguide 106, the 11th
As shown, the electric field directions will be the same and therefore the feed waveguides 102 and 104 will be excited in phase. Within the feed waveguide 102, the electric field is maximum in phase at the feed slots 114, 116, resulting in a radiating waveguide 100-
Power is supplied in the same phase as 1 to 100-4. Similarly, the radiation waveguides 100-5 to 100-8 are also fed with power in the same phase. Therefore, all radiating waveguides 100-1 to 100-8 are fed in phase.

In the embodiment illustrated in FIGS. 1O and 11, feed waveguides 102, 104 are connected to branch slots 110, 112.
and its power supply slots 114, 116; 118, 120
The asymmetrical location of the feed waveguides 102, 104 and feed slots 114, 116, 118, 120 is somewhat difficult to design and manufacture. To deal with this, by making the branch slots 110° and 112 vertical slots instead of horizontal slots, the power supply slot 11
4.116; 118, 120 can be arranged symmetrically.

FIG. 12 shows a waveguide structure of a modified example.

In FIG. 12, 122 is an input/output waveguide, 124 is a branch waveguide, 126 and 128 are branch slots that are vertical slots, 130 and 132 are feeding waveguides, and 134 and 136 are vertical slots.
138.140 is a power supply slot, 142 (142-1
~142-8) is a radiating waveguide. Arrows indicate electric field direction. In this modification, one branch slot 126 is
The other branch slot 128 is arranged at a position of 5λg/4 from the feeding point of the input/output waveguide 122.
It is placed at a position of 3λg/4 from the feeding point of No. 2. As can be seen from the explanation with reference to FIG. 5, the preferred position for the vertical slot and horizontal slot is λg/4 in the tube axis direction.
This is because they are out of alignment.

The feed slots 134 and 136 of the feed waveguide 130 are located at a distance of λg/2 from the branch slot 126, and the feed slots 138 and 140 of the feed waveguide 132 are located at a distance of λg/2 from the branch slot 128, respectively. The total radiation waveguides 142-1 to 142-8 are arranged in the feed slots 134, 136,
Powered in phase by 138°140.

Next, an example of a manufacturing method for the embodiment shown in FIGS. 6 and 7 will be described. This may be due to the fact that no current flows at the central axis position of the H-plane (long side side surface) of the waveguide. In the embodiment shown in FIGS. 6 and 7, the feeding waveguide 42,
44. Even if the input/output waveguide 46 and the branch waveguide 48 are divided into two at the central axis position of the H plane, there is no problem in waveguide performance.

Utilizing this fact, the feeding circuit portion consisting of the waveguides 42, 44, 4648 and the radiation waveguide can be easily manufactured. In addition, in the case of reverse-phase power feeding, it is known that no current substantially flows through the partition walls that isolate each radiating waveguide (1999 patent application No. 85690). This part can also be easily manufactured.

FIG. 13 is an exploded perspective view when manufacturing the embodiment shown in FIGS. 6 and 7. FIG. The same components as in FIGS. 6 and 7 are given the same reference numerals.

The feeding waveguides 42, 44 and the branching waveguide 48 (and if possible, the input/output waveguide 46) are separated into two halves along the central axis of the H plane, and members corresponding to each halves are separated. 1
50.152 are manufactured separately. In addition, in the upper half body 150 and the lower half body 152, 154 and 156 are central partition walls that separate the branch waveguide 48 and the feeding waveguides 42 and 44;
58, 160 are side walls forming the H-plane on the input/output waveguide 46 side of the branch waveguide 46; 162, 164 are the feeding waveguides 42;
．． This is the side wall formed by the 11th surface on the side of the radiation waveguide 40 of 44. Reference numeral 166 denotes an end plate that separates the feeding waveguide 42 and the feeding waveguide 44. Such a terminal plate 166 also connects to the upper half body 150.
and lower half body 152, and each half is divided into upper half body 150.
It is preferable to fix it to the lower half body 152 first.

Central bulkhead 154.1 of upper half 150 and lower half 152
56 includes a notch 5 for forming the branch slot 50.
'OA, 50B, and notches 52A, 52B for forming the branch slot 52 are formed, and the side wall 158,
160 is formed with cuts 47A and 47B for forming a coupling slot 47 with the input/output waveguide 46,
Power feeding slots 54 are formed in the side wall 164 at intervals of λg/2.

Side walls 158, 162 and central bulkhead 154 of upper half 150
and the side walls 160, 164 of the lower half body 152 and the central partition wall 1
56, the upper half 150 and the lower half 1 are in contact with each other.
If the feeding waveguides 42.52 are brought close together and fixed to each other, the feeding waveguides 42.
44 and a branch waveguide 46 are formed. Depth of cut 50A, 5
A branch slot 50 is formed by 0B, and a notch 52A
, 52B, a branch slot 52 is formed, and the notch 4
A coupling slot 47 with the input/output waveguide 46 is formed by 7A and 47B. After that, each waveguide 42°44.46
What is necessary is to terminate the end face at a predetermined position.

Of course, like the end plate 166, it is convenient to first fix the two halves of the end plate to the upper half body 150 and the lower half body 152, respectively.

Further, 168 is the bottom plate of the entire antenna, and 170 is a radiation slot plate with radiation slots, which also constitutes the main conductor wall of the radiation waveguide 40. 172,172.
... are wall plates for forming side walls of the radiation waveguide 40. In the case of reverse phase power supply, the wall plate 172 is connected to the bottom plate 168
Or, it is known whether it is sufficient to electrically connect to either one of the radiation slot plates 170 (Patent Application No. 8 of 1999).
No. 5690). Therefore, the wall plate 172 may be welded to either the bottom plate 168 or the radial slot plate 170 in advance.

The end of the radial slot plate 170 is bent to receive the lower half 152, and the folded portion 1
70A, opening 174 for power feed slot 54.56
Open it.

The opening 1 flap 4 itself can also function as the power feeding slot 54,56, in which case the lower half 152
A structure as shown in FIG. 4 may be used. That is, a large opening 176 is provided in the side wall in contact with the radiation waveguide 40 at a portion where the power feeding slot 54, 56 is located. The folded portion 170A of the radiation slot plate 170 functions as a side wall of the feed waveguide 42°44.

Embodiments other than those shown in FIGS. 6 and 7 can be similarly divided into two parts along the central axis of the H plane, and therefore can be manufactured easily.

In each of the above embodiments, for example, in the case of the 12 GHz band, the long sides of the radiation waveguide, feeding waveguide, and branching waveguide are approximately 20 mm.
The short side of the radiation waveguide is about 5 mm, and the short side of the feed waveguide and branch waveguide is about 9 mm to avoid loss.
It is about 5 mm.

In each of the above-described embodiments, power feeding and branching by E-plane demultiplexing are employed, so that the power coupling efficiency is improved.

By adopting a branched structure, each waveguide can be shortened, which simplifies analysis, design, and manufacturing. Furthermore, the entire feeder circuit can be manufactured in two parts, which also simplifies manufacturing and provides an inexpensive waveguide slot antenna.

The present invention is applicable to both standing wave type and traveling wave type waveguide slot antennas. In the present invention, the number of radiation waveguides to which the feeding waveguide feeds power and the number of branches by the branching waveguides are not limited to the illustrated example. Moreover, although the case of emitting radio waves has been explained, it goes without saying that it can also be used for receiving according to the reciprocity theorem.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, power can be efficiently fed to the radiating waveguide. It also simplifies analysis and therefore design and manufacture. Furthermore, since it can be manufactured by processing plate materials, it can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a waveguide structure diagram taken along line A-A in FIG. 1, FIGS. 3 and 4 are perspective views of a conventional example, and FIG. The figure is an explanatory diagram of the effect of vertical slots and horizontal slots, Figure 6 is a perspective view of an embodiment of reverse phase feeding and two-stage branching, Figure 7 is a diagram of the waveguide structure taken along line B-B in Figure 6, Figure 8 is a perspective view of an example of negative phase feeding and three-stage branching, Figure 9 is a diagram of the waveguide structure seen along line C-C in Figure 8, and Figure 10 is an implementation of in-phase feeding and two-stage branching. An example perspective view, Fig. 11 is I)-D of Fig. 10.
Figure 12 is a waveguide structure diagram of another example of in-phase feeding and two-stage branching, and Figure 13 is a diagram of the waveguide structure seen in lines.
An exploded view of the fabrication of the illustrated embodiment, FIG. 14, is an alternative to the lower half 152 of FIG. 13. 30. Radiation waveguide 32. Feeding waveguide 34. Input/output waveguide 36: Feeding slot 38 Vertical slot 39:
Horizontal slot 40 (40-1..., 4O-8): Radiation waveguide 42, 44: Feeding waveguide 46: Input/output waveguide 47: Coupling slot 48: Branching waveguide 50, 52
: Branch slot 54 56: Power supply slot 58 (5
81,... 58-8): Radiation waveguide 60.62.
64, 66: Feeding waveguide 68: Input/output waveguide 70,
72,74: Branch waveguide 76.7880.82,84
, 86: Branch slot 8890.92, 94: Power supply slot 100 (100-1,... 100-8):
Radiation waveguide 102.104: Feeding waveguide 106: Input/output waveguide 108: Branching waveguide 110, 112: Branching slot 114, 116, 118, 120: Feeding slot 122: Input/output waveguide 124: branch waveguide
126, 128: Branch slot 130. 132: Feeding waveguide 134, 136, 138. 140: Feeding slot 142 (142-1 to 142-8): Radiation waveguide 150, upper half body 152, lower half body 154 , 156: Central bulkhead 158.160, 162, 164: Side wall 16
6: Termination plate 47A, 47B; 50A, 50B, 52A
, 52B: Notch 168: Bottom plate 170: Radiation slot plate 172: Wall plate 174: Opening 176: Opening

Claims (2)

[Claims] (1) A feeding circuit for a waveguide slot antenna consisting of a large number of radiating waveguides each having radiating slots, the feeding circuit being one or more radiating waveguides that communicate with the terminal surface of each of a predetermined number of radiating waveguides in the H plane. A waveguide slot characterized by consisting of a feeding waveguide.
Antenna power supply circuit. (2) According to claim (1), further comprising one or more branching waveguides that guide the input radio wave to the one or more feeding waveguides by E-plane branching. feeding circuit for a waveguide slot antenna.