JPS6314486Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a waveguide slot array antenna in which slots are formed in a rectangular waveguide.

FIG. 1 shows a perspective view of the structure of a conventional waveguide slot array antenna, with main parts cut away.

In the figure, 1 is a wide groove, 2 is a slot, 3 is a shorting plate, 10 is a first metal plate, and 20 is a second metal plate.

Here, the area surrounded by the wide groove 1 formed in the first metal plate 10 and the second metal plate 20 forms a rectangular waveguide, and the slot 2 is located along the wide groove 1 in the second waveguide.
It is formed on the metal plate 20 of. In addition, in the waveguide type slot array antenna, both ends of the rectangular waveguide, that is, the first metal plate 10 and the second metal plate 20
Although both ends of are often short-circuited by a short-circuiting plate 3, only one side is shown here to simplify the explanation.

This conventional waveguide slot array antenna will be briefly explained below.

A conventional waveguide slot array antenna mainly uses two metal plates 10 and 20, with the first metal plate 1
Wide grooves 1 equal to the H-plane width of the rectangular waveguide are periodically formed in the waveguide 0, slots 2 are periodically formed in the second metal plate 20, and the first metal plate 10 and the second
This was realized by overlapping the metal plates 20 with the wide grooves 1 and the slots 2 so that the long axis directions of the wide grooves 1 and the slots 2 coincided with each other, with the wide grooves 1 on the inside, and attaching the shorting plate 3. Note that here, the first metal plate 10,
Although it is necessary to sufficiently connect the second metal plate 20 and the shorting plate 3 both mechanically and electrically, the method of connecting these is omitted.

In the conventional waveguide slot array antenna,
Such a configuration simplifies manufacturing to a certain extent.

However, in this conventional waveguide type slot array antenna, the shorting plate 3 has a drawback.

One of them is that in a waveguide slot array antenna that requires a shorting plate 3 between the slots 2 in the longitudinal direction of the slots 2, such as for monopulse reception or large aperture, the thickness of the shorting plate 3 is As a result, the intervals between the slots 2 cannot be made equal, resulting in deterioration of the antenna pattern. This becomes a big problem especially when the frequency becomes high.

The second problem is that the shorting plate 3 must be made separately, which requires a lot of effort to manufacture.

The waveguide slot array antenna according to this invention eliminates the above-mentioned drawbacks and is characterized by an improved antenna pattern and simplified manufacturing.

FIG. 2 is a structural perspective view showing an embodiment of the waveguide slot array antenna according to this invention, with main parts cut away.

In the figure, 1 is a wide groove, 2 is a slot, 10 is a first metal plate, 20 is a second metal plate, and 30 is an inductive post.

Here, the area surrounded by the wide groove 1 formed in the first metal plate 10 and the second metal plate 20 forms a rectangular waveguide, and the slot 2 is located along the wide groove 1 in the second waveguide.
It is formed on the metal plate 20 of. In addition, in the waveguide type slot array antenna, both ends of the rectangular waveguide, that is, the first metal plate 10 and the second metal plate 20
Although both ends of are often short-circuited, only one side is shown here to simplify the explanation.

The waveguide slot array antenna according to this invention will be explained below.

The waveguide slot array antenna according to this invention uses two metal plates 10 and 20, and wide grooves 1, which are equal to the H-plane width of the rectangular waveguide, are periodically formed in the first metal plate 10. At the same time, a plurality of inductive posts 3 are arranged perpendicularly to the bottom surface of the wide groove 1 and along the end surface.
0 and a slot 2 is formed in the second metal plate 20, and the first metal plate 10 and the second metal plate 2 are connected to each other.
0 are realized by aligning the long axis direction of the wide groove 1 with the long axis direction of the slot 2 and overlapping them with the wide groove 1 on the inside. Note that here, it is necessary to sufficiently connect the first metal plate 10, the second metal plate 20, and the plurality of inductive posts 30 both electrically and mechanically. are omitted.

The waveguide type slot array antenna according to this invention has such a structure that utilizes the cut-off phenomenon to connect the plurality of inductive posts 30, which function as the conventional shorting plates 3, to the first metal plate. Since the wide groove 10 is formed in the same process at the same time as the wide groove 1, there is no need to separately make the shorting plate 3 as in the conventional case, and the manufacturing process is simplified.

FIG. 3 is a perspective view showing another embodiment of the waveguide slot array antenna according to this invention, with main parts cut away.

In the figure, 1 is a wide groove, 2 is a slot, 10 is a first metal plate, 20 is a second metal plate, and 30 is an inductive post.

Here, the area surrounded by the wide groove 1 formed in the first metal plate 10 and the second metal plate 20 forms a rectangular waveguide, and the slot 2 is connected to the second groove along the wide groove 1.
It is formed on the metal plate 20 of. Further, a plurality of inductive posts 30 are formed on the first metal plate 10 to form a short circuit surface utilizing the cut-off phenomenon of the rectangular waveguide.

A waveguide slot array antenna according to another embodiment of this invention will be described below.

The waveguide slot array antenna having such a configuration is advantageous when the conventional shorting plate 3 is required between the slots 2 in the longitudinal direction of the slots 2, such as for monopulse reception or for large aperture diameters.

In the conventional waveguide slot array antenna,
Whereas the shorting plate 3 was required separately and the thickness of the shorting plate 3 adversely affected the antenna pattern, in the waveguide type slot array antenna of another embodiment according to this invention, the conventional shorting plate 3 was required. The plurality of inductive posts 30 serving as the first metal plate 1
In addition, the short-circuit surface can be formed at the center of the inductive post 30 due to the effect of the inductive post 30, and the slot 2 in the longitudinal direction of the slot 2 Since the spacing can be made the same, manufacturing can be simplified and the antenna pattern can be improved.

Here, some additional information will be given regarding the effects of the above-mentioned inductive post 30. In the conventional shorting plate 3, the shorting surface is the end of the shorting plate 3, whereas in a configuration in which the shorting surface is formed by a plurality of inductive posts 30, if the inductance of the inductive post 30 is appropriately selected, the shorting surface can be induced. It can be moved to some extent on the sex post 30.

In this way, the waveguide slot array antenna according to this invention uses a plurality of inductive posts 30 formed on the first metal plate 10 instead of the conventional shorting plate 3, which simplifies manufacturing. It is effective in improving the antenna pattern.

In this invention, a case has been described in which the slot 2 is formed on the H-plane of a rectangular waveguide, but the present invention is not limited to this, and can also be used in a case where the slot is formed on the E-plane. It can also be used when the inductive post 30 is formed on the second metal plate 20.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the structure of a conventional waveguide slot array antenna, Fig. 2 is a perspective view of the structure of an embodiment of the waveguide slot array antenna according to this invention, and Fig. 3 is a perspective view of the structure of an embodiment of the waveguide slot array antenna according to this invention. FIG. 3 is a perspective view of another embodiment of a waveguide slot array antenna;
In the figure, 1 is a wide groove, 2 is a slot, 3 is a short circuit plate, 10 is a first metal plate, 20 is a second metal plate,
30 is an inductive post. In addition, in the drawings, the same or corresponding parts are indicated by the same reference numerals.

Claims (1)

[Claims for Utility Model Registration] (1) Wide grooves are periodically formed in the first metal plate, slots are periodically formed in the second metal plate, and these first metal plates In a waveguide slot array antenna formed by overlapping a second metal plate with the long axis direction of the wide groove and the slot aligned, and with the wide groove inside,
A waveguide slot array antenna characterized in that a plurality of inductive posts are formed along the end face of a first or second metal plate. (2) The waveguide slot array antenna according to claim (1) of the utility model registration, characterized in that a plurality of inductive posts are formed between the slots in the longitudinal direction of the slots.