JPH04273702A - Slotted waveguide-type antenna mounted on wall - Google Patents

Abstract

PURPOSE: To provide an antenna which is composed of a slotted waveguide, attached to a wall, and suitable to such a case that the antenna must not be protruded from the wall. CONSTITUTION: A slightly curved wall has a groove 2 forming three side faces of a waveguide and the fourth side face of the waveguide is formed of a conductive plate 3 having a slot 4. The plate 3 is fixed on the groove 2 or the wall has a hole into which the metallic profile constituting the waveguide is partially inserted. A dielectric plate 6 which operates as a radome is fixed to the slotted surface of the waveguide.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to slotted waveguide microwave antennas, ie antennas comprising a waveguide having one or more radiating slots in its wall. The present invention relates to an antenna, particularly when mounted on a wall, such as a building wall or the body of a vehicle.

0002

BACKGROUND OF THE INVENTION Known antennas of this type are formed from rectangular or circular waveguides, the slots of which are generally obtained by milling. Antennas formed in this way have a fixing device used for fixing them to the wall to which they are to be mounted, and a radome, usually formed by a thin layer of dielectric covering at least these slots. .

0003

These known antennas require that the wall be pre-fitted to facilitate mounting them on the wall. This requires, for example, that the waveguide antenna be fixed using screws, then that the radome be attached to a guide and that this guide be attached to a wall. Furthermore, if the antenna must not protrude from the wall, e.g. for aerodynamic reasons, the production of the guide with the fixings may require that this is no longer possible in a standard assembly and must be specially adapted to the wall or, on the contrary, that the waveguide This is made more difficult because the walls have to be specially designed for the tube.

An object of the present invention is to simplify the structure of these slot antennas.

[0005]

SUMMARY OF THE INVENTION This antenna comprises a conductive plate having slots cut into it such that the wall is grooved and the assembly thus formed constitutes the desired slotted waveguide. obtained by covering this groove with.

The present invention provides an antenna coupled to a wall, comprising a waveguide having n slots and an internal space, where n is an integer greater than 0, and comprising a waveguide coupled to a wall. a conductive plate in which the waveguide slot is formed, the plate overlying the groove to define a space between the plate and the groove;
An antenna is provided in which the space forms an internal space of a waveguide.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and other characteristics will become apparent from the following description and accompanying drawings.

In the drawings, corresponding parts are designated with the same reference numerals.

FIG. 1 shows a waveguide-type antenna according to the prior art in cross-section, ie perpendicular to the largest dimension of the waveguide. This antenna is mounted on a wall 1 that is specifically designed to accommodate this antenna. In the described embodiment, the wall is part of the body of the aircraft. When there is no antenna, this wall 1 is a slightly curved wall with no sudden change in curvature, and has a plane in the center of the curved surface, and this plane has two types of wings 7a and 7b on the short axis side. It has an oval hole into which a metal profile 7 constituting a rectangular waveguide having a shape is partially inserted. This waveguide has wall 1
has two long ends parallel to and on either side of the plane of the plane. Furthermore, it has several slots 4 formed in the outer long side of the body. A dielectric plate 6, acting as a radome, is fixed on the slotted long side outside the waveguide. wing 7
a and 7b have holes into which screws such as 8a and 8b are inserted, which are used for screwing the profile to the planar part of the wall 1.

FIG. 2 shows a waveguide-type antenna according to the invention in cross-section, ie perpendicular to the largest dimension of the waveguide. This antenna is mounted on the same type of aircraft and in the same location on the body as the antenna shown in FIG. But here the wall at the antenna attachment point is designed differently. The wall 1 no longer has an oval hole, but a longitudinal groove 2 with vertical sides and a flat bottom. The tops of these sides each have two recesses 2a and 2b, above which a panel 3 with a printed circuit is provided. The printed circuit includes a support formed of dielectric material 6 on which a conductive metal layer 5 is deposited except where there are so that slots 4 can be defined in the metal layer. The printed circuit 3 is fixed using a conductive adhesive onto the recesses 2a and 2b with the dielectric side facing away from the aircraft according to the opposite side of the groove 2.

The antenna according to FIG. 2 thus formed is similar to the antenna according to FIG. 1 in that the cavity inside the waveguide is defined by the space between the groove and the panel 3 or printed circuit covering this groove. It is a slotted waveguide type antenna. In this embodiment, the dielectric material support 6 of the printed circuit is protected by a radome formed as in FIG.

The invention is not limited to the embodiments described. Instead of printed circuits, the panel 3 may, for example, include a metallic conductive plate with slots cut into it and other plates made of dielectric material. These two plates are fixed together and are designed to be sufficiently rigid. If a radome is not essential, a simple metal conductive plate with slots can be used to close the groove.

Although in the embodiment described the waveguide is rectangular, the invention also applies to antennas in which the waveguide has different profiles, in particular circular waveguides and waveguides with a longitudinally varying cross section. Applicable.

Furthermore, the number of slots in the antenna is not specified as the number of slots is not important to embodiments of the invention. As in the known art, the antenna may be formed with one or several slots.

[Brief explanation of the drawing]

1 is a sectional view of an antenna according to the prior art; FIG.

FIG. 2 is a cross-sectional view of an antenna according to the invention.

[Explanation of symbols]

1 Wall 2 groove 2a, 2b recess 3 Panel 4 Slot 5 Conductive metal layer 6 Dielectric layer

Claims (4)

[Claims] Claim 1: An antenna comprising a waveguide having n slots and an internal space, where n is an integer greater than 0, and coupled to a wall, the antenna being formed within the wall. a groove and a conductive plate with the waveguide slot formed therein, the plate overlying the groove to define a space between the plate and the groove, the space forming a waveguide. An antenna characterized by forming an internal space of a tube. 2. The antenna according to claim 1, further comprising an insulating plate fixed to the conductive plate. 3. The antenna of claim 2, wherein the insulating plate and the groove are on either side of the conductive plate and the insulating plate constitutes a radome for the antenna. 4. An antenna according to claim 2, characterized in that the conductive plate and the insulating plate are each formed by a metallized surface and a printed circuit carrier.