JPH032978Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a slot array antenna used in a ship radar.

(Prior Art) Conventionally, as a slot array antenna used in a marine radar, for example, the one shown in FIG. 7 is known.

In FIG. 7, reference numeral 1 indicates an antenna flare constituting the antenna outer casing, and a rectangular waveguide housing section 2
A pair of open walls 3a, 3 with a predetermined inclination angle from
b, and this antenna flare 1 is produced by extrusion, drawing or sheet metal bending of aluminum material. A slotted waveguide 4 in which opening slots are formed at pitch intervals determined by the wavelength used by the antenna is fixed to the waveguide storage portion 2 of the antenna flare 1 with adhesive or the like, and the front part of the slotted waveguide 4 is A vertical component suppressing grit plate 5 is fixed to the plate with screws or the like.

Further, window storage grooves 6 are formed in the opening of the antenna flare 1 so as to face each other vertically, and a window 7 having a double structure is installed in the window storage groove 6.
is attached to close the antenna opening.

The window 7 having a double structure is made of urethane foam with a low dielectric constant between two resin window plates 8a and 8b made of, for example, glass fiber reinforced plastic (FRP) that can withstand harsh external environmental conditions. The installation width of the window plates 8a and 8b is as follows.
It is set to be, for example, λ/4 with respect to the wavelength λ used by the antenna so that a reflection phase in which the radio waves reflected by the inner window plate 8a and the radio waves reflected by the outer window plate 8b cancel each other out is obtained. By canceling out such reflected waves, overall characteristics equivalent to those without a radio wave window are achieved.

(Problems to be solved by the invention) However, in the case of such a conventional slot array antenna, when manufacturing a window with a double structure, two window plates 8a and 8b are used.
Normally, antennas were manufactured by supporting them with a jig at a predetermined interval determined by the wavelength used by the antenna, filling them with foamed resin such as foamed urethane, and drying and fixing the alarm resin after filling. Since the longitudinal dimension is as long as 1 to 3 meters, the thickness of the window tends to be uneven, and high dimensional accuracy is required during manufacturing, making the manufacturing cost relatively high.

Furthermore, the window 7, which has a double structure, is attached to the antenna flare 1 by inserting the window 7 from the side into the window storage groove 6 and fixing the front and back sides with adhesive 10. It is relatively difficult to push the window 7 with the shape into the window groove 6 formed in the opening of the antenna flare 1, and since the inside of the window is filled with soft foamed resin 9, it cannot be fixed by caulking. There was a problem in that sufficient mechanical strength could not be obtained because the adhesive 10 was used to fix the parts.

(Means for Solving the Problems) The present invention was made in view of these conventional problems, and it is easy to assemble a window with a double structure to an antenna flare, and the thickness of the window can be reduced. It is an object of the present invention to provide a slot array antenna for a radar which can be made uniformly and has sufficient mounting strength.

In order to achieve this purpose, in the present invention, at positions opposite to the top and bottom of the opening of the antenna flare,
A window storage groove is formed, and two window plates made of glass fiber-reinforced plastic or the like are inserted from the sides into this window storage groove at a predetermined distance determined by the wavelength used by the antenna and assembled. It is.

(Function) According to the structure of the slot array antenna of the present invention, the wavelength λ/4 of the antenna used is λ/4.
Since the thickness of the window set is determined by the assembly interval with respect to the window storage groove formed in the antenna flare, the thickness of the window can be made uniform over the entire length. In addition, filling with foamed resin is no longer necessary, and the double-layered window is assembled through the antenna assembly process, so there is no need to manufacture the window in a separate process, simplifying the manufacturing and assembly process and reducing manufacturing costs. be able to.

Furthermore, since the two window plates are placed in the window housing groove, the window plates can be caulked and fixed to the window housing groove, and the mechanical strength when the window is installed can be sufficiently increased.

(Embodiment) FIG. 1 is a sectional view showing an embodiment of the present invention.

First, to explain the configuration, reference numeral 12 denotes an antenna flare that forms the antenna outer casing, and a pair of opening walls 14a and 14b extend from the rectangular waveguide housing part 13 toward the opening side with a predetermined opening inclination angle. are doing.
A pair of waveguide storage grooves 15 are formed in the waveguide storage portion 13 of the antenna flare 12, vertically facing each other.
By inserting the fitting rib 16 integrally formed at the rear of the slot waveguide 16 into this waveguide storage groove 15, the slot waveguide 16 can be stored in the waveguide of the antenna flare 12 without using adhesive. It is attached and fixed to part 13.

A vertical component suppressing grit plate 17 is disposed on the front surface of the slotted waveguide 16 incorporated in the waveguide housing 13, and the vertical component suppressing grit plate 17 is vertically opposed to the inside of the antenna flare 12 in the longitudinal direction. It is assembled and fixed by inserting it from the side into the grit storage groove 18 formed in the.

Furthermore, in the present invention, a pair of window storage grooves 2 are provided on the opening side of the antenna flare 12 vertically facing each other.
0a and 20b are formed in the front and back, and the inner window plate 22a and the outer window plate 22b are inserted into the window storage grooves 20a and 20b from the side and assembled and fixed to form an antenna window with a double structure. are doing. Here, the inner window board 22
Glass fiber-reinforced plastic, polycarbonate, or the like, which has enough strength to withstand the environment in which the antenna is used, is used for the antenna a and the outer window plate 22b.

Further, an adhesive sealant 25 is applied to the outside of the insertion portion of the outer window plate 22b into the window housing groove 20b.
5 seals the inside of the antenna flare 12 from the outside.

FIG. 2 is an enlarged sectional view showing part A in the embodiment of FIG. 1, and shows the inner window plate 22.
The window storage groove 20a that stores the window is formed in the longitudinal direction as a rectangular groove with an insertion tolerance for the inner window plate 22a, whereas the window groove 20b that accommodates the outer window plate 22b is formed in the longitudinal direction. The outer wall 26 side forming the groove is hollowed out in an arc shape from the bottom of the groove, and the opening is tapered diagonally upward to form a caulking deformed portion 28 in which a fitting protrusion 27 is formed. A caulking receiving groove 29 consisting of two V-shaped grooves is formed on the inner wall side facing the fitting protrusion 27.

In this way, the caulking deformation part 28 and the caulking receiving groove 2
By crimping the caulking deformable portion 28 toward the groove side with the outer window plate 22b assembled as shown in the window storage groove 20b having a Groove 29
The outer window plate 22b is clamped and fixed between.

Furthermore, a pair of window storage grooves 20a and 20b are formed in the front and back on the opening side of the antenna flare 12.
The interval between the window housing grooves 20a and 20b on the inner wall side is set to λ/4 relative to the wavelength λ used by the antenna. By attaching the inner window plate 22a and the outer window plate 22b to the
2b is uniquely set to λ/4 determined by the interval between window storage grooves 22a and 22b.

On the other hand, an adhesive recess 30 is formed at the open end of the antenna flare 12 following the window storage groove 20b, and the formation of the adhesive recess 30 allows the outer window plate 22b shown in FIG. 1 to be fitted into the window storage groove 20b. The adhesive sealant 25 can be easily applied to the portion.

Next, manufacturing and assembly of the slot array antenna of the present invention will be explained with reference to FIG. 3, which shows a perspective view of the antenna end portion of the slot array antenna of the present invention shown in FIG.

First, the waveguide storage section 13 of the antenna flare 12
Since a waveguide storage groove 15 is formed in the waveguide storage groove 15, a slotted waveguide 16 with a fitting rib 16 integrally formed at the rear of the waveguide storage groove 15 is inserted from the side of the antenna flare 12. and install it in the state shown. In this way, the slotted waveguide 16 inserted into the waveguide housing part 13 of the antenna flare 12 is fixed at multiple locations in the joining part 31 of the slotted waveguide 16 and the open end of the waveguide housing part 13. It can be easily fixed by punching it in place. As is clear from FIG. 3, the slot waveguide 16 has opening slots 16b formed in its front surface at predetermined pitch intervals determined by the wavelength used by the antenna.

Next, the vertical component suppressing grit plate 1 is inserted into the grit storage groove 18 of the antenna flare 12 from the side.
7 and similarly punch the joint portion 32 of the grit storage groove 18 and the vertical component grit plate 17 at a plurality of locations, thereby fixing the vertical component suppressing grit plate 17 to the antenna flare 12.
This vertical component suppressing grit plate 17 has vertical opening slots 17a formed at predetermined pitch intervals at positions facing the slot waveguide 16.

Next, the inner window plate 22a and the outer window plate 22b are inserted from the sides into the pair of window storage grooves 20a and 20b formed in the opening of the antenna flare 12, and the window storage groove into which the outer window plate 22b is inserted is inserted. As for the groove 20b, as shown in FIG.
8, the outer window plate 22b can be fixed to the window housing groove 20b by crimping the crimping deformed portion 28. Of course,
Regarding the inner window plate 22a, similar to the slot waveguide 16 and the vertical component suppressing grit plate 17,
Inner window plate 2 for window storage groove 20a
It can be fixed by punching multiple locations of the mating portion 33 of 2a.

In this way, the inner window plate 22 is inserted into the window storage grooves 20a and 20b of the antenna flare opening.
The manufacturing and assembly of the slot array antenna of the present invention is completed by assembling and fixing the outer window plate 22a and the outer window plate 22b. Of course, a side plate is fixed to the side of the antenna flare 12 shown in FIG. 3 by screws or adhesive, and a connecting flange is attached to one side of the slot waveguide 16 by welding or the like. A feed waveguide was connected to the antenna from the outside to supply power to the antenna.

FIG. 4 is a perspective view showing another embodiment of the window plate used in the dual structure antenna window used in the slot array antenna of the present invention. The inner window plate 22a and the outer window plate 22b were inserted into the window storage grooves 20a and 20b of the antenna flare opening, but in this embodiment, the outer window plate 22b is the same as in the previous embodiment. One window board is used, but for the inside window board, the inside window board 2 is divided into three parts.
2a is inserted into the window storage groove 20a of the antenna flare, and since the position of the window plate is determined by insertion into the window storage groove 20a, a divided window plate can be used as the inner window plate 22a.

FIG. 5 is a sectional view showing another embodiment of the present invention, and in this embodiment, the antenna flare 1
A single window storage groove 20 is formed in the opening of the window 2, and a flat outer window plate 22b and a tray-shaped inner window plate 22a are inserted into the window groove 20 in a superimposed manner. Inner window board 22
In a, the length from the tray-shaped opening to the bottom surface is set to λ/4 with respect to the wavelength λ used by the antenna, and the tray-shaped inner window plate 22a and the flat outer window plate 22b are overlapped for window storage. It is inserted into the groove 20 and fixed by caulking.

Window storage groove 2 in the embodiment shown in FIG.
As is clear from FIG. 6, which shows part A of No.
A crimped deformable portion 28 having a fitting protrusion 27 on the 6 side is formed, and the fitting protrusion 2 of the crimped deformed portion 28 is formed.
A caulking receiving groove 29 consisting of two V-shaped grooves is formed on the inner wall side facing the window 7, and an adhesive recess 30 is further formed on the opening side following the window housing groove 28. Therefore, as shown in FIG. 5, by overlapping the inner window plate 22a and the outer window plate 22b and incorporating them into the window housing groove 20, the caulking deformed portion 28 is caulked so that the window plate can be fixed.
Note that the other structures are the same as the embodiment shown in FIG.

(Effects of the invention) As explained above, according to the invention, in a radar slot array antenna in which a double structure window is attached to the opening of the antenna flare,
Window storage grooves are formed at opposite positions above and below the antenna flare opening, and a pair of window plates with a predetermined interval determined by the wavelength used by the antenna are inserted into the window storage grooves from the sides and assembled and fixed. We can manufacture and assemble heavy structure windows.
Since there is no need for a separate process for manufacturing and assembling the window, and there is no need to fill it with foamed resin, the manufacturing and assembling process for slot array antennas is simplified.
In addition, in a dual structure antenna window, the setting interval between the pair of window plates determined by the wavelength used by the antenna is uniquely determined by the insertion of the window plate into the window storage groove of the antenna flare, so the thickness of the window can be made uniform. The reflected waves can be reliably canceled based on the reflected phases of the radio waves by the two window plates with high dimensional accuracy, and excellent antenna performance can be ensured.

Further, since the window plate can be fixed to the window housing groove by caulking, sufficient strength can be obtained for attaching the window to the antenna flare.

Furthermore, a pair of window storage grooves are formed,
If each window plate is inserted and fixed, a divided window plate can be used for the inner window plate, and it is not necessary to use the inner window plate that corresponds to the length of the antenna flare. Since there is no waste, the yield of materials can be increased and costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of section A in Fig. 1, Fig. 3 is a perspective view showing the flare side of Fig. 1, and Fig. 4 is a sectional view showing an embodiment of the present invention. Figure 5 is a perspective view showing another embodiment of the window plate, Figure 5 is a sectional view showing another embodiment of the present invention, Figure 6 is an enlarged sectional view of section A in Figure 6, and Figure 7 is FIG. 2 is a sectional view showing a conventional example. 12: antenna flare, 13: waveguide storage section,
14a, 14b: opening wall, 15: waveguide storage groove,
16: Slot waveguide, 16a: Fitting rib, 16
b: opening slot, 17: vertical component suppression grit plate, 17a: vertical opening slot, 18: grit storage groove, 20, 20a, 20b: window storage groove, 22a: inner window plate, 22b: outer window plate, 24: foaming Resin, 25: Adhesive sealant,
26: Outer wall, 27: Fitting protrusion, 28: Caulking deformation part, 29: Caulking receiving groove, 30: Adhesive recess, 3
1, 32, 33: joining part, 34: empty space.

Claims (1)

[Claims for Utility Model Registration] (1) In a radar slot array antenna in which a double-layered window is attached to the opening of the antenna flare, the window is housed in a position opposite to the top and bottom of the opening of the antenna flare. 1. A slot array antenna for radar, characterized in that a groove is formed, and a pair of window plates having a predetermined interval determined by the wavelength used by the antenna are inserted and assembled from the sides into the window housing groove. (2) Utility model registration claim 1, characterized in that a pair of window storage grooves are formed in front and rear positions at upper and lower opposite positions of the antenna flare opening with a predetermined interval determined by the wavelength used by the antenna. Slot array antenna for radar. (3) A single window storage groove having a width equivalent to two window plates is formed vertically opposite to the opening of the antenna flare, and a predetermined depth determined by the antenna usage wavelength is formed in the window storage groove. 2. The slot array antenna for radar according to claim 1, which is characterized in that a tray-shaped inner window plate and a flat outer window plate are stacked and assembled. (4) A crimped deformed portion is formed on the outer wall side of the window storage groove, and after the window plate is inserted, the crimped deformed portion is caulked to fix the window plate. Claim 1 Slot array antenna for radar as described in section. (5) The slot array antenna for radar according to claim 1, wherein a plurality of divided window plates are inserted and assembled into the inner window housing groove.