JPS6226906A - Reflector layout - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that they are located one behind the other and are coupled to each other by a support structure, each selectively actuated in planes of polarization orthogonal to each other, have the same shaped profile, and are of equal focal length. Regarding the arrangement of two reflectors with a common aperture, these reflector shells are inclined to each other by a certain angle.

According to the literature (ENGT!Ft:IFourth 1nte
national conference, on
antennas anji propagation
.

Engineering ahP 85; Conference Pubx-
No. 248; Pj53-557) The arrangement of polarization-selective reflectors for communications satellites is known, and these reflectors are arranged one after the other, each with two polarization planes orthogonal to each other.
possesses a reflector that is activated by These reflectors have equal focal lengths and equal geometric dimensions.

Since the transmission system has a spatial extent and must be arranged next to each other, the two reflectors are each inclined at a small angle with respect to the main radiation direction. This results in an arrangement of the reflector shells as shown in the accompanying figure, with one edge of the reflector shells located very close together2) and the opposite edges separated from each other by a considerable distance. There is. However, this is particularly important when a reflector arrangement such as the one described above, with a diameter of about 5 meters, is used in communications satellites.

This is because there is not enough space in the rocket canister to fit such a reflector arrangement in its folded state at the time of departure.

From DE 25 02 551 A2, two reflector shells cut out of equal paraboloids of revolution are known. As a reflector, symmetrically located sections of a paraboloid of revolution are used, although they have a similar shape. However, this arrangement does not provide the very compact configuration required for today's multi-stage start satellites.

The aim of the invention is to create a reflector arrangement which is at least comparable in properties to the known arrangement, and which reduces the distance of the edges of the shells which are separated from one another in an appreciable manner.

The above object is achieved by the present invention, in which the reflector shells are equally spaced from a paraboloid of rotation with a focal length of This is achieved by forming the apertures with different offset angular positions such that they are located at approximately equal distances from the reflector arrangement in the direction of the main radiation.

One embodiment of the invention is shown in the accompanying drawings and will now be described in detail.

One reflector arrangement is shown in FIG. 1, which corresponds to the prior art. Two reflectors R12
and R2 are in this case of equal magnitude, have curves with equal curvature and have equal focal lengths f. The two reflectors IR1°R2 each possess a polarization-selective structure on their surface, for example a dipole arrangement or a strip. As a result, each reflector reflects electromagnetic waves polarized in one direction, but transmits polarized waves in a direction perpendicular to this. The two transmitting systems B1 and S2, which are attached in two polarization directions, must be installed diagonally one after the other because the focal lengths f of the two reflectors are equal. In addition, two reflectors RLj? and R2 are used to align the emitted radiation with the main radiation direction.
They must be mutually tilted by an angle α in the plane of the drawing. Therefore, the edges of the facing reflectors are opened by d.

FIG. 2 shows an embodiment of the arrangement corresponding to FIG. 1, which has been improved according to the invention. At this time, the two reflectors R1 and R2 have the same focal length. This is because these reflectors are formed from one paraboloid of revolution RP according to the ggs diagram.

Section Z1. Z2 are different offset angles γ1. It is determined by γ2. The criterion for this offset is that the apertures 81, 82 of the transmission system are located as much as possible in one plane. This minimizes the divergence angle between the radiation axes of the transmit system. This is because the edges of the apertures become adjacent to each other. The angle of inclination α between the reflectors and thus also the value of d are thus significantly reduced.

In the experimental device of the above-described embodiment, the number of cases in which the two reflectors separate from each other was reduced by 25% compared to the prior art device. Furthermore, the transmitting device is designed to prevent the formation of eclipses.
Can be installed compactly.

[Brief explanation of the drawing]

Fig. 1 shows the reflector arrangement according to the prior art, Fig. 2 shows the reflector arrangement improved by the present invention, and Fig. 3 shows the reflector surface cut out using two cylindrical surfaces from an equal paraboloid of revolution. shows. In the figure, 01.02... Reflector shell rl, r2... Offset angle 81.82... Transmission system α... Tilt angle B... Main radiation direction RP... Paraboloid of revolution It is a surface.

Claims (1)

[Claims] located one behind the other and coupled to each other by a support structure, each operating selectively in planes of polarization orthogonal to each other, having the same shaped profile, equal focal lengths and equal common aperture, and mutually tilted. In an arrangement of two reflectors with reflector shells (
01, 02) are paraboloids of revolution (R
P), the transmitting system belonging to these reflectors (01, 02) in a plane including the mutual inclination angle (α)
characterized in that the apertures S1, S2) are formed with different offset angular positions (γ1, γ2) such that they are located at approximately equal distances from the reflector position in the direction of the main radiation (B). Reflector arrangement.