JP3650083B2 - Waveguide slot array antenna - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a waveguide slot array antenna used in a high frequency band such as a microwave band and a millimeter wave band.
[0002]
[Prior art]
FIG. 2 is a perspective view of a conventional waveguide slot array antenna. The base body 5 of FIG. 5B is provided with a groove-shaped feeding waveguide 1 along the front side edge, and a number of groove-shaped radiation waveguides 3 extend from the feeding waveguide 1. A T-branch portion 2 is formed in a portion that continues from the feed waveguide 1 to each radiation waveguide 3, and a side wall opposite to the T-branch portion 2 of the feed waveguide 1 faces each T-branch portion 2. An inductive wall 4 is provided as described above. Due to the inductive wall 4 and the T branching portion 2, the electromagnetic wave propagating through the feeding waveguide 1 is fed to each radiation waveguide 3.
[0003]
FIG. 2A shows a slot plate 9 which is made of a metal plate such as aluminum, or a metal foil printed on a dielectric. When the slot plate 9 is attached to the base body 5 with a screw or the like by aligning the mounting hole 8 and the mounting hole 6 of the base body 5, the electromagnetic wave radiation receiving / receiving slot 7 is positioned at a position corresponding to the radiation waveguide 3. Are provided in a row. In the example of FIG. 2, the slot plate 9 is attached to the base body 5 with screws, but there are other cases where the slot plate 9 is attached with a conductive adhesive or a conductive adhesive sheet instead of screws.
[0004]
FIG. 3 is a partially enlarged view of FIG. A waveguide is connected to a lower part of a feed hole 10 provided in the middle of the feed waveguide 1 or a coaxial waveguide converter is connected, and a transmission electromagnetic wave is sent from a transmitter / receiver connected to the end of the waveguide. It enters the feed waveguide 1 and is distributed from there to each radiation waveguide 3 and radiated from the slot 7 of the slot plate 9 to the space. In the case of reception from space, the flow is reversed.
[0005]
[Problems to be solved by the invention]
However, when mounting the slot plate and the base body with screws, there is a problem that a screw margin is required around the antenna as shown in FIG.
[0006]
In the case of using a conductive adhesive or a conductive adhesive sheet, there is no need for twisting, but there is a problem that the performance as an antenna is deteriorated because the conductivity deteriorates with the passage of time.
[0007]
An object of the present invention is to provide a waveguide slot array antenna having a close contact structure that does not use screwing and does not use a conductive adhesive or a conductive adhesive sheet in view of the above-described problems of the prior art. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the waveguide slot array antenna of the present invention has the following configuration.
That is, a base body in which a concave feeding waveguide and a plurality of concave radiating waveguides fed from the feeding waveguide are provided in parallel on one surface of a plate-like conductive member corresponds to each radiating waveguide. A waveguide slot array antenna in which a slot plate provided with a row of slots for radiation along its longitudinal direction is in close contact with each other, and the close contact structure includes the slot plate on the base body and a recess in the base body. In addition to being bonded with an adhesive or an adhesive sheet on a plane other than the surface, conductive bumps previously provided at the bonding locations of the slot plate penetrate through the adhesive layer or the adhesive sheet and contact the base body. A waveguide slot array antenna.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention does not use screwing to attach the slot plate and the base body, but uses an adhesive or an adhesive sheet, and the conduction between the slot plate and the base body is provided in advance at the bonding location on the slot plate. The conductive bump is obtained by pressing the slot plate and the base body to pass through the adhesive layer or the adhesive sheet so that the tip of the bump contacts the base body. .
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a partial view of a cross section perpendicular to the longitudinal direction of a radiation waveguide 3 in an embodiment of the present invention. (A) is sectional drawing with which the slot board 13 and the base body 14 were integrated. The slot plate 13 is bonded to the upper surface of the boundary bank 15 of the base body 14 by an adhesive layer or an adhesive sheet 12. The conduction between the lower metal surface of the slot plate 13 and the boundary bank 15 is established by the bumps 11.
[0011]
The bumps 11 are made of a conductive material such as a conductive resin, and are provided in advance on the lower surface metal surface of the slot plate 13. When the slot plate 13 is bonded to the base body 14, the lower end of the bump 11 penetrates the adhesive layer or the adhesive sheet 12 and comes into contact with the upper surface of the boundary bank 15 of the base body 14. Conduction between the bodies 14 is obtained.
[0012]
When the bump 11 is made of a conductive resin, when the tip of the bump 11 is pressed against the boundary bank 15, the tip is crushed and widened, and the contact surface becomes wider, and a better conduction state is obtained.
[0013]
In the example of FIG. 1, adhesion at the boundary bank 15 that delimits the adjacent radiation waveguides 3 is shown, but the adhesion and conduction by the bumps 11 are not limited to the boundary bank 15, When the slot plate 13 is positioned and overlapped with the base body 14, bonding and conduction by bumps are possible at any location where surface contact is obtained.
[0014]
FIG. 1B is a view showing a state where the slot plate 13 and the base body 14 are not yet bonded.
A bump 11 having a sharp tip is provided in advance at a planned adhesion position on the lower metal surface of the slot plate 13 by printing or the like. The slot plate 13 may be a metal plate alone or may be a dielectric substrate printed with a metal foil.
[0015]
On the other hand, an adhesive layer is printed or an adhesive sheet is affixed on the planned bonding site of the base body 14, in the example shown in the figure, on the upper surface of the boundary bank 15.
Then, the slot plate 13 is positioned and pressed against the base body 14 so that the slot plate 13 is bonded to the base body 14 and the point of the conductive bump 11 penetrates the adhesive layer or the adhesive sheet 12 and the base body. The contact between the slot plate 13 and the base body 14 is obtained.
[0016]
In this way, by naturally bonding the slot plate 13 and the base body 14 with an adhesive or an adhesive sheet using a necessary contact surface, there is no need for peripheral screwing, and therefore no screwing margin is required. In addition, since the conduction between the slot plate 13 and the base body 14 is obtained by the bumps 11 at the bonding portion, the adhesive does not need to be conductive, and deterioration of the conductivity over time needs to be a problem. Disappear.
[0017]
【The invention's effect】
As described above, the waveguide slot array antenna of the present invention uses a portion that is in plane contact with the lower surface of the slot plate, such as the upper surface of the boundary bank of the radiating waveguide, for mounting the slot plate and the base body. The slot plate and the base body are bonded with an adhesive or an adhesive sheet, and the slot plate and the base body are electrically connected with a conductive bump in advance on the portion of the metal surface of the bottom surface of the slot plate where the base plate is to be bonded. When pressure-bonding to the base body, the conductive bumps penetrate the adhesive layer or the adhesive sheet and the tip contacts the base body so that conduction can be obtained. As in the case of conventional screwing The surrounding screw is not required, and the antenna can be miniaturized by that amount, and the conduction between the slot plate and the base body can be obtained by the conductive bumps. There is an advantage that should a problem of the conductive aging deterioration is eliminated without it.
[Brief description of the drawings]
FIG. 1 is a partial view of a cross section perpendicular to the longitudinal direction of a radiation waveguide in an embodiment of the present invention.
FIG. 2 is a perspective view of a conventional waveguide slot array antenna.
FIG. 3 is a partially enlarged view of FIG. 2 (b).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Feeding waveguide 2 T branch part 3 Radiation waveguide 4 Inductive wall 5 Base body 6 Mounting hole 7 Slot 8 Mounting hole 9 Slot plate 10 Feeding hole 11 Bump 12 Adhesive layer or adhesive sheet 13 Slot plate 14 Base body 15 Boundary bank

Claims (1)

A base body in which a concave feeding waveguide and a plurality of concave radiating waveguides fed from the feeding waveguide are provided in parallel on one surface of a plate-like conductive member, corresponding to each radiating waveguide. A waveguide slot array antenna in which a slot plate in which a row of slots for radiation is provided along a longitudinal direction is in close contact, and the close contact structure is provided on the base body except for the recesses of the base body. Bonded with an adhesive or an adhesive sheet on the plane of the part, and conductive bumps previously provided at the bonding locations of the slot plate are in contact with the base body through the adhesive layer or the adhesive sheet. A waveguide slot array antenna.

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