JPH0411373Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a feedome used in radar and the like.

[Conventional technology]

FIG. 2 is a side view of a conventional phase array radar device. In the figure, 1 is a transmitter/receiver, 2 is a distributor, 3 is a dipole antenna connected to the distributor, 4 is a reflector, 5 is a housing for storing these electrical components, and 6 is attached to the front of the housing. It is a single-skin type fitted dome.

Next, the functions will be explained. A signal from a transmitter 1 is fed to a dipole antenna 3 by a distributor 2 and radiated forward as radio waves.

The reflector plate 4 is for reflecting the radio waves emitted backwards forward, and is located at a distance of λ/4 (λ is the free space wavelength of the radio wave) from the feeding center of the dipole antenna to reduce loss due to reflection. placed in

The feed dome 6 is a kind of waterproof cover, and is integrated with the housing 5 to form a waterproof structure for housing electronic equipment.

The radio waves radiated by the dipole antenna are transmitted through this field and radiated to the outside.

In addition to the single-skin type type of feedome as shown in Fig. 2, there is also a sandwich type type of feedeme as shown in Fig. 3. In the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts. 8 is a dielectric skin, and 9 is a dielectric honeycomb.

The thickness of this sanderch type field is approximately λ/4 in order to reduce electrical loss.

[Problem that the invention attempts to solve]

Conventional radar devices are constructed as described above, and because radio waves are transmitted through the field and radiated, electrical loss and wind resistance in the field are problematic. That is, in order to reduce electrical loss, it is better to have a thin film dome, but when the film thickness is made thin, mechanical strength decreases and wind resistance deteriorates. In addition, although the sand German beach type dome has better wind resistance than the single skin type dome, the dome thickness is determined by the wavelength of the radio waves used, so especially in the case of short wavelength radio waves, the dome thickness becomes thinner and the wind resistance decreases. There was a problem of storage, and a disadvantage that the thickness of the entire device increased by the increase in the thickness of the feedome.

This invention was made to solve the above-mentioned problems, and aims to provide a feedome with low electrical loss, excellent wind resistance, light weight, and small installation space.

[Means for solving problems]

The feedome according to this invention uses a dielectric film on the front skin of the sandwich structure and a metal film on the back skin, which is used as a reflector.A cutout is provided on the back side of the feedome, and a dipole antenna can be inserted into this cutout. This is how it was done.

[Effect]

By using the skin as a reflector on the back side of the sanderch structure, the feedome in this design can increase the core thickness, improve wind resistance (mechanical strength), and reduce weight. In addition, the radio waves only pass through the dielectric thin film skin on the surface side of the field, so there is little electrical loss. Since the dipole antenna is inserted into the field, the apparent thickness of the field (thickness of the device as a whole) can be reduced.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, the same reference numerals as in FIGS. 2 and 3 indicate the same or corresponding parts. Reference numeral 7 denotes a sandwich panel type feedome according to the present invention, which is attached to the housing 5. The feedome 7 has a sandwich structure in which a dielectric skin 8 and a metal skin 10 are bonded to both sides of a dielectric honeycomb core 9. The dipole antenna 3 is inserted into a notch provided in the metal skin 10 and the dielectric honeycomb core 9.

Next, the operation will be explained.

Output from transmitter 1 to dipole antenna 3
It is the same as the conventional device until the radio waves are emitted. The radiated radio waves pass through the dielectric thin film skin 8 and are radiated to the outside. The rear skin of the feedome is a metal film and serves as a reflector that reflects the radio waves emitted backward from the dipole antenna forward.

The dome itself has a sander beach structure with a thick core, and is used as a waterproof cover and a wind-resistant structural member.

In the above embodiment, a dielectric honeycomb core was used as the core material, but a dielectric foam material may be used instead of the honeycomb core.

Further, in order to further improve the wind resistance, it is also possible to attach a reinforcing material to the back surface of the feedome shown in the embodiment.

[Effect of idea]

As described above, according to this invention, the feed dome has a sandwich structure, and the back side skin is made of a metal film.
The surface skin is composed of a dielectric film and a dielectric core, and the structure allows the dipole antenna to be inserted into the feed dome, so it has low electrical loss, excellent wind resistance (mechanical strength), is lightweight, and can be installed in the thickness direction. This has the effect of providing a small-space fiedome.

[Brief explanation of drawings]

FIG. 1 is a side view of a radar device according to an embodiment of the invention, FIG. 2 is a side view of a conventional radar device, and FIG. 3 is a cross-sectional view of a conventional sand-gerch type field. 1 is a transmitter/receiver, 2 is a distributor, 3 is a dipole antenna, 4 is a reflector, 5 is a housing, 6 is a single skin type field, 7 is a sandwich type field, 8 is a dielectric skin, 9 is a dielectric honeycomb core, 10 is metal skin. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of claims for utility model registration] (1) In the sandwich panel type video dome,
A dielectric skin is provided on the first surface, a metal skin is provided on the second surface, and a notch is provided on the side of the metal skin into which the antenna element can be inserted, and the antenna element is inserted into the sandwich type panel. A sandwich panel type dome characterized by its structure. (2) The sandwich panel type feedome according to claim 1 of the utility model registration, characterized in that a dielectric material is used for the core of the sandwich panel.