JPH0210651Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a slot array antenna device suitable as an antenna for marine radar, relay equipment, etc., and in particular to a slot array antenna device with an improved mounting part. The present invention relates to an antenna device.

〓Prior art〓 This slot array antenna device is smaller and lighter than parabolic antennas, etc.
It is often used in marine radars that need to be mounted on masts, etc.

Conventionally, as this type of slot array antenna device, there is a horn type antenna device shown in FIG.

The antenna device shown in FIG. 1 consists of a slotted waveguide 1 fitted into a holding member 2 made of a metal channel member, and a horn 5 functioning as a reflector plate attached to the opening of the holding member 2. In addition, the horn 5 is provided with a grating, which constitutes a vertical polarization suppressing element 6 that suppresses vertically polarized waves, and a radome 7, which covers the opening, at the opening of the horn 5.

This antenna device is mounted on a rotation drive system,
It is rotated and used as a radar. For attachment to the rotational drive system, as shown in FIG.
is provided, and the projection 5a and the holding member 2 are placed at appropriate positions,
This is done by attaching it to the antenna support part 11 of the rotation drive system 10.

However, since the horn 5 is provided with a protrusion, the shape of the horn 5 becomes complicated, and the portion with the protrusion must be made particularly thick because the horn itself with the protrusion supports the weight. The drawback is that it takes time to produce and increases production costs.
Moreover, there is a disadvantage that the weight of the horn is increased, which places a burden on the parts such as the rotational drive system where the antenna is to be mounted.

〓Purpose of the invention〓 The present invention was made in view of the above-mentioned problems, and it can be formed without complicating the shape of the reflector (horn) or increasing the weight of the reflector, reducing production time. It is possible to reduce costs, and furthermore,
It is an object of the present invention to provide a slot array antenna device that does not place a burden on the part where the antenna is to be mounted.

〓Constitution of the invention〓 In order to achieve the above object, the constitution of the present invention includes a microwave radiation source and a reflector which is provided with an opening in front of the radiation source and which reflects the emitted electromagnetic waves and forms a directional beam. In the slot array antenna device comprising a wave, a position of the reflector at a position remote from the radiation source,
The fixing member is thin enough compared to the wavelength of the electromagnetic wave used.
The reflector is mounted across the opposing walls and fixed at each wall, and one end of the fixing member is attached to the antenna support with one end protruding outward from the reflector wall. It is characterized by becoming.

Conventionally, in order to prevent scattering of electromagnetic waves, it has been common to not place any metal member or the like in front of a microwave radiation source. However, the present inventor has found through experiments that when a fixing member that is sufficiently thin compared to the wavelength of the electromagnetic waves used is placed at a position away from the radiation source as in the above configuration, scattering of the electromagnetic waves is extremely small. It has been found that there is no practical problem even when the electromagnetic wave radiation pattern has strict requirements, such as when used in radar or the like.

The present invention was made based on this knowledge, and a fixing member that is sufficiently thin compared to the wavelength of the electromagnetic waves used is installed at a position away from the radiation source, across the wall opposite the reflector plate, and By fixing the reflector to each wall, the weight of the reflector is supported by the fixing member, so no burden is placed on the reflector itself. Therefore, there is no need to make the reflector particularly thick.
It is possible to simplify the shape and reduce the weight.

Further, by protruding one end of the fixing member and using it as a mounting member, the antenna device can be mounted on a rotational drive system or the like in the same way as a conventional antenna device.

Furthermore, since a special projection or the like is not provided on only one of the upper and lower reflecting plates, the reflecting plates can be configured vertically symmetrically. Therefore, the same reflectors can be used for the upper and lower sides, and the number of parts can be reduced.

〓Example〓 An example of the present invention will be described with reference to the drawings.

The slot array antenna device of the first embodiment of the present invention shown in FIG. 2 is constructed by fitting a slot waveguide 1 into a holding member 2 made of a metal channel member. A horn 5 functioning as a reflector is attached to the horn 5, and a grating constituting a vertical polarization suppressing element 6 for suppressing vertical polarized waves and a radome 7 covering the opening are provided at the opening of the horn 5. This applies to antenna devices consisting of:

That is, in the device of this embodiment, a mounting seat 5b having a through hole is provided in the horn 5 of the antenna device at a position away from the slotted waveguide 1 which is a radiation source, and the mounting seat 5b is provided with a mounting seat 5b having a wavelength of the electromagnetic wave used. It is constructed by inserting a fixing member 8 which is sufficiently thinner than that shown in FIG.

This fixing member 8 is threaded at both ends, with one end protruding and inserted into the mounting seat 5b. Both ends of the fixing member 8 are fixed to the mounting seat 5b by nuts 9. Also, the end of the fixing member 8 that protrudes to the outside of the horn 5 (in this embodiment, the lower end)
is fixed to the antenna support member 11 of the rotary drive system 10 by a nut 9 as a mounting portion 8a.

According to such a structure, unlike the conventional example shown in FIG. Since both parts are supported by the fixing member 8, the structure of the mounting seat is simple and the horn does not need to be particularly thick. Furthermore, since the lower end of the fixing member 8 is used as the attachment part for the antenna support part 11, the weight of the horn is directly supported by the antenna support part 11, so the attachment can be carried out without mechanical stress, and a special No parts are required and the number of parts does not increase.

Next, a second embodiment of the present invention shown in FIGS. 3 and 4 will be described. 3 is a partially cutaway side view showing a second embodiment of the slot array antenna device of the present invention, and FIG. 4 is a perspective view showing the structure of the antenna constituting the main part of the above embodiment.

The antenna device of the second embodiment is applied to a slot array antenna device in the same way as the first embodiment, and the present applicant has provided it with a dielectric waveguide mechanism and a small reflector. By replacing the horn with a small reflector and reducing the size, we have further improved the device related to ``Japanese Patent Application Laid-open No. 1983-31205,'' which was proposed as an antenna device that is smaller and lighter and has a smaller aperture area. It is what it is.

That is, the device of this embodiment has a slotted waveguide 1 fixed to the web of a holding member 2, and a slotted waveguide 1 is attached to the front end of the waveguide 1, with a space in front of the front end sandwiched between the slotted waveguide 1 and the slotted waveguide 1 whose plate thickness corresponds to the wavelength used. A pair of dielectric plates 3a, which are sufficiently thin compared to the
A dielectric waveguide mechanism 3 consisting of 3b is provided protrudingly, and
A reflecting plate 4 is provided outside the pair of dielectric plates 3a, 3b at the opening of the holding member 2 to reflect electromagnetic waves transmitted through the vicinity of the bases of the dielectric plates 3a, 3b and emitted. In the antenna device with a dielectric waveguide mechanism, the fixing member 8 is configured to receive the weight of the reflecting plate 4 and to be attached to the rotation drive system 10.

The dielectric waveguide mechanism 3 of this antenna device is formed by arranging dielectric plates 3a and 3b in a substantially parallel or non-parallel state with their tips slightly approached. A vertical polarization suppressing element 6 consisting of a grid is provided at the base of the dielectric plates 3a, 3b so as to cover the front end of the slot waveguide 1. Further, in front of the opening of the reflecting plate 4, a radome 7 formed of a dielectric sheet and having a substantially parabolic shape is mounted.

The opening 4a of the reflecting plate 4 located away from the front end of the slotted waveguide 1 has a diameter of about 4 mm, which is sufficiently thin compared to the wavelength of the electromagnetic wave used, for example, in this embodiment, less than 1/8 of the wavelength. A fixing member 8 of approximately 100 liters is inserted through the through holes 3c provided in the dielectric plates 3a and 3b, and is attached across the wall facing the reflector.

This fixing member 8 is threaded at both ends and is fixed with a nut 9 at the reflection plate opening 4a. In this embodiment, two fixing members 8 are attached, but depending on the length of the antenna, three or more fixing members 8 may be attached. In this case, the fixing members 8 are arranged at intervals that do not suppress the polarized wave component used.

The fixing member 8 has one end (lower end in this embodiment) protruding outward from the reflecting plate opening 4a to serve as a mounting portion 8a for the mounting location, and the nut 9 connects the rotary drive system 10. It is fixed to the antenna support part 11.

According to this configuration, as in the first embodiment, both the upper and lower reflector plates 4 are supported by the fixing member 8, so the structure of the mounting part is simple and the reflector plate does not need to be specially designed. It does not have to be formed thickly.
Furthermore, the lower end of the fixing member 8 is attached to the antenna support section 11.
Since the weight of the reflector is directly supported by the antenna support part 11, it can be mounted without any mechanical stress, and since no special mounting parts are required, the number of parts is not increased.

In addition, according to this embodiment, since no weight burden is placed on the reflector plate 4, the reflector plate can be formed of a synthetic resin material with a metal layer embedded therein, thereby making it possible to further reduce the weight of the antenna device. . As a result, the fixing member 8 can be made thinner.
In this case, the rigidity of the reflecting plate 4 may be slightly insufficient compared to a metal reflecting plate, but since the opening can be fixed with the fixing member 8, there is no problem in practical use. On the contrary, since it can be slightly deformed, it is convenient to be able to finely adjust the aperture angle.

〓Effects of the invention〓 As explained above, the present invention does not complicate the formation of the reflector (including the horn) and can be formed without increasing the weight of the reflector, reducing the time and effort required for production. First, it is possible to reduce costs, and furthermore, it is possible to realize a slot array antenna device that does not place a burden on the part where the antenna is to be mounted.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional slot array antenna device, Fig. 2 is a sectional view showing a first embodiment of the slot array antenna device of the present invention, and Fig. 3 is a sectional view of the slot array antenna device of the present invention. FIG. 4 is a partially cutaway side view showing a second embodiment of the device; FIG. 4 is a perspective view showing the structure of an antenna constituting the main part of the above embodiment. 1... Slot waveguide, 2... Holding member, 3...
...dielectric waveguide mechanism, 4...reflection plate, 3a, 3b...
...Dielectric plate, 4a... Opening, 5... Horn, 6
...Vertical polarization suppression element, 7...Radome, 8...
...Fixing member, 8a...Mounting part, 9...Nut, 1
0... Rotation drive system, 11... Antenna support section.

Claims (1)

[Claims for Utility Model Registration] A slot device comprising a microwave radiation source and a reflected wave that is provided with an opening in front of the radiation source and that reflects the emitted electromagnetic waves to form a directional beam. In the array antenna device, a position of the reflector away from the radiation source,
The fixing member is thin enough compared to the wavelength of the electromagnetic wave used.
The reflector is mounted across the opposing walls and fixed at each wall, and one end of the fixing member is attached to the antenna support with one end protruding outward from the reflector wall. A slot array antenna device characterized by: