JPS58201406A - Radome - Google Patents

Abstract

PURPOSE:To make the pickup by the radar of the opposite party difficult, by preventing damages to electronic devices at the inside because of the transmission of an EMP and the increase in an RCS value due to the transmission of radar electromagnetic waves of the opposite party, by means of metallic wires installed at the inside of a radome main body for various loadings such as air loading and missile loading, and for ground. CONSTITUTION:The metallic wires 2 of reed-screen shape in a prescribed wire interval are installed at the inside of the radome main body 1. The radome like this is provided so as to cover the front surface of a flat antenna 3, which is connected to the attached electronic devices. The interval of said metallic wires 2 is designed so that the EMP and the electromagnetic waves of the radar of the opposite party are shielded. Since the smaller the mesh interval/wavelength the larger the shielding effect of the electromagnetic field because of the wire gauze is, the electromagnetic waves are hardly transmitted with a lower frequency in proportion by setting the mesh interval to a certain value. Since the EMP electromagnetic waves are refleted on the radome part through the radome in this constitution, damages to the electronic devices due to the invasion of the electromagnetic waves into the antenna part at the inside are avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radome for turret-mounted and ground-based radomes such as A% missiles.

The radome is a dome that covers the antenna to protect it from ice formation, wind pressure, etc., and is designed to have good four-wave rejection in the frequency band used.

However, conventional radomes have the following drawbacks.

(1) Conventional radomes have a frequency band of 10KHz~
100MHz electromagnetic pulse
etlcPulse, hereinafter abbreviated as EMP) etc. 4I:
:221 passed. The electric field strength due to EMP temple is approximately 5
Since it reaches 0K V / 1K, the internal electronic equipment is damaged by the EMIlt magnetic energy that enters the interior through the antenna system.

(-) In aircraft, missiles, etc., when the own radar is directly facing the other party's radar, the other party's radar's signal that passes through the radome is reflected by the own aircraft's FCS antenna or seeker antenna. In order to pass through the radome again and return to the other side, the radar cross section (ladar Cr
oss8@etlon (hereinafter abbreviated as RC8) becomes large, making it easier for the own aircraft to be captured by the other party's radar.

The present invention has been made to solve the above-mentioned drawbacks, and by attaching a metal wire to the inner surface of the radome main body, it is possible to prevent damage to the internal electronic VIIA device due to penetration of EMP, and to prevent damage to the other party's radar *M. Transmission (two-way R
The object is to provide a radome that can prevent a slight increase in C8 and make it difficult to be captured by the radar of the other party.

The present invention will be described below! An example applied to a radome for an allFcs antenna will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a streamlined radome body, and on the inner surface of the cough radome body 1, blind-shaped metal wires 2 are arranged at predetermined intervals to constitute the radome. The radome is disposed in front of the planar antenna 3. The antenna 3 is connected to an attached electronic device (not shown).

The spacing between the metal wires 20 is such that radio waves from the EPM and the other party's radar can be shielded. The electromagnetic field shielding effect of a wire mesh increases as (mesh spacing)/(wavelength) decreases, so if the mesh spacing is set to a certain value, the lower the frequency, the less electromagnetic waves will penetrate. In other words, radio wave reflection is large. For example, the frequency band used for self-loss FCS radar waves is X band (9000MHz), and my father uses KuX band 1.
In the case of 6500MH'i), if the -eye interval is set to about 10cm, the self-loss radar radio waves will pass through, but the EMpg waves (
10 KHz to 100 MHz) and low frequency radio waves (L band: 100,100 O, S band: 3,000 MHz) from the other party's radar.

However, according to the above-mentioned radome, since the EMP radio waves can be reflected at the radome part, it is possible to prevent the EMP radio waves from entering the internal antenna part and damaging the electronic equipment.

Furthermore, since the L-band or S-band radio waves from the other party's radar can be reflected at the radome portion, reflection at the internal planar antenna 3 is eliminated. While the RCa value due to reflection at the planar antenna 3 is very large,
The RC8 value due to reflection from the streamlined radome is extremely small, making it difficult for the other party's radar to detect and capture the aircraft. Moreover, the above effects can be obtained without any adverse effect on the own radar.

In the present invention, the metal wire attached to the inner surface of the radome main body is not limited to the woven wire in the form of a blind as in the above embodiments, but may be in the form of a lattice or a spiral.

As described in detail above, according to the present invention, it is possible to prevent internal damage to the slave device and to prevent damage to the other party's radar.
Therefore, it is possible to provide a radome that can be difficult to capture.

[Brief explanation of the drawing]

The figure is a perspective view, partially in section, of a radome according to an embodiment of the present invention. 1... Radome body, 2... Metal wire, 3...
·antenna. Patent attorney 6

Claims (1)

[Claims] A radome characterized by a metal wire attached to the inner surface of the radome body.