SU1394279A1 - Slotted-guide aerial for radar - Google Patents

Abstract

The invention relates to microwave antenna technology can be used as a radar antenna, for example, a side view mounted on an aircraft, for example, space-based. The aim of the invention is to reduce the dimensions in the transport state while maintaining the gain, the gearbox, the width of the radiation pattern and the level of the side lobes in the working state under the operating conditions on the aircraft. Wave-slit antenna contains a waveguide consisting of sections, where in the general case i 1j2, ..., N (in figures N 5), in which slits 2 e (in the wide wall of the waveguide) are cut and which are installed on the basis of - the most common of parts 3j, where in the general case j 1,2, ..., K (in figures K 6). Parts 4 and 3 are connected to tension mechanism 4. The first section 1, the waveguide is attached to the first part 3, the base with the hinge 5, and the last section Ij of the waveguide - to the last part 3, the base with the hinge 6. The axes of the hinges 5 and 6 are elevated above the base surface to a height greater than half width narrow wall section 1; waveguide. The power supply waveguide 7 is connected to the input of the first section 1, the waveguide through the flexible section 8, section 1; the waveguide is interconnected by an articulating fixing unit 9. In the transport position of part 3; the bases together with the waveguide sections 1 arranged on them are in the folded position, and the sections 1; pressed to the corresponding parts 3; bases and thus protected against overloads. After delivery of the antenna, for example, to the satellite orbit and the release of the transport grips, part 3j of the base together with sections 1 installed on them; the waveguide under the action of the spring elements associated with the hinges connecting the sections begin to fold into a straight line. The tension mechanism 4 implements a constant tension force. 1 hp f-ly, 6 pcs. 4 L cl with so vj y

Description

The invention relates to microwave antenna technology and can be used as a radar antenna, for example, a side view, installed by Banye on an aircraft, for example, space-based.

The purpose of the invention is to reduce the dimensions in the transport state while maintaining the gain, efficiency, width of the radiation pattern and the level of side lobes in the working state under the operating conditions on the aircraft.

FIG. 1 shows a waveguide slit antenna for a radar in the working position, a general view; FIG. 2 shows a hinge-fixing unit; FIG. 3 is a section A-A in FIG. 2 (spring seals on the flange), n FIG. 4 is a section BB in FIG. 2, (sealing grooves on the flange); in fig. 5 - the base of the waveguide-slot antenna in the folded position} in FIG. 6; the tension mechanism,

Wave-gap antenna for radar (Fig. 1) contains a waveguide consisting of sections 1, where i 1,2, .., N. In the waveguide sections, slits 2 are made, the base consists of parts 3, where i 1,2,. ,,, K. In the presented example, N 5, K 6, Parts 3, and 3 are connected to tension mechanism 4. The first section 1j of the waveguide is attached to the first part 3 os

using the hinge 5, and the last section of the Is-waveguide to the last part of the base station using the hinge 6, the hinge axes 5 and 6 are elevated above the basement surface to a height, greater than the half width of the narrow wall, sections 1; waveguide. The power supply waveguide 7 is connected to the input of the first section 1, through the flexible section 8.

The waveguide sections 1J are connected to one another by a hinge-fixing unit 9 (FIG. 2), which consists of brackets 10-13, symmetrically fixed on the narrow walls of each section 1; waveguide. The first brackets 10 and 12 of two adjacent sections 1. and 1;., The waveguide are connected by a hinge 14, and the cam 15 is rigidly fixed to it on the first bracket 10, and the pin 16 is mounted on the second bracket 1 of section 1, 13 of section 1, a torsion spring 17, a hook 18 and a pawl 19, working

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the surface of which through the rod 20 is connected with the surface of the cam 15. Spring seals 21 (Fig. 3) are mounted on the flange 22 of the waveguide section 1j, and on the flange 22 of the adjacent section 1 ;, of the waveguide (Fig. 4), sealing grooves 23 are made. The walls of each section 1 of the waveguide are soldered to plates 24, forming a horn that narrows the antenna pattern in a plane perpendicular to its axis.

The base parts 3 (Fig. 5) are connected to each other by cylindrical hinges 25 with spring mechanisms 26.

The tensioning mechanism 4 (Fig. 6) comprises two cylindrical guides 27 connected by a bridge 28 and rigidly mounted on the base part 3. The bottom screw 29 through the spring 30 and the washer 31 is connected to the console 32 of the base part 34, and through the threaded hole with a jumper 28. The side screw 29 is equipped with an electric actuator 33.

The device works as follows.

In the transport position, the base parts 3j, together with the waveguide sections located on them, are in the folded position (Fig. 5). Sections 1 are pressed to the corresponding parts of the 3-base and are thus protected from overloads upon delivery to orbit. In sections 1 of the waveguide, slits 2 are cut through the wide wall approximately with a step of approximately, where A is the wavelength in the waveguide, with the slits 2 arranged alternately symmetrically relative to the axis of the waveguide. The displacement of the slots 2 from the axis varies depending on their distance to the entrance, which leads to the formation of the required amplitude distribution along the aperture of the waveguided antenna. The power supply waveguide 7 is connected to the input of the first section 1, through the flexible section 8. On the narrow walls of the section 1; plates 24 are fused to narrow the radiation pattern in a plane perpendicular to the axis of the antenna.

After delivery of the antenna into orbit and release from the transport grips under the action of the spring mechanisms 26 of part 3 ;, connected by cylindrical hinges 25, begin to fold into a straight line. Wherein

The waveguide sections 1, also rotated relative to each other in the gaterns 14 of the pivotally fixing units 9, begin to unfold. The rod 20 slides at one end over the surface of the cam 15 and, when the flanges are 22 adjacent sections 1; and 1 ;, bringing together, the pH with its second end releases the working surface of the pawl 19, allowing the hook 18 to rotate and engage the pin 16 under the action of the spring 17 of the torsion, which ensures a reliable connection of the sections 1. Since the distance from the axis of the waveguide to the hinge 14 connecting the brackets 10 and 12 is equal to the distance from the axis of the waveguide to the pin 16 on the bracket 11 and to the axis of the hook

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A tensile force is applied, stabilized by the spring 30, they cannot cause the curvature of the waveguide and the expansion of the antenna pattern.

Claims (2)

Invention Formula 1, Wave-gap antenna for radar, containing a waveguide with slits, fixed on the base, characterized in that, t the purpose of reducing overall dimensions in the transport state while maintaining the gain, efficiency, beam width and side lobe level in working condition nii in 18 on the bracket 13, then extending the 20 conditions of operation on the aircraft force directed along the axis of the waveguide does not have bending effects on section 1; waveguide. When approaching flanges 22 sections 1; and 1 ;, the spring seals 21 are inserted into the respective sealing grooves 23, ensuring the electrical tightness of the joint even in the presence of a gap between the flanges 22 of the sections 1; and 1-,. After completion of the unfolding process, tension is applied to the electric drive 33 of the tensioning mechanism 4. This screw 29, driven by the rotation of the electric drive 33, moves relative to the bridge 28 and through the washer 31 and the spring 30 t there is no console 32 fixed on the bottom part 3, resulting in a console 25 thirty 35 the waveguide apparatus is made of sections connected by a hinge-fixing. f: as a unit, the base is complete as a minimum of two parts with the possibility of movement, for example, turning them in the same plane one relative to the other, a tensioning mechanism is introduced connected to two parts of the base, and the waveguide anchorage to the base is made in the form of hinges installed at the ends of the first and last sections of the waveguide. 2. The antenna according to claim 1, wherein the hinge-fixing unit contains brackets symmetrically mounted on the narrow walls of each section of the waveguide, the first brackets of two adjacent sections 32 moving along cylindrical waveguides 40 connected by a hinge, The first bracket of one second; the water is coaxial with the hinge; the cam is rigidly fixed, and the second bracket of this section of the waveguide is equipped with a pin; on the second bracket of the other section of the waveguide, a twist, hook and dog are mounted on one axis; The distance from the axis of the waveguide to the axis of the hinge is equal to the distance from the axis of the waveguide to the axis of the hook and to the axis of the pin. ruler 27, mounted on part 3, of the base. Thus, parts 3, -3, move relative to the base parts Zz-Zb, and with the help of hinges 5 and 6 pull sections l.-ls 45 above the base. As a result, the weight of the waveguide-antenna in working position has a perfectly flat surface wide walls of the waveguide. Temperature drops can deform the base, but since the waveguide is fixed only at two points at the ends of the first and 50 five 0 five the waveguide apparatus is made of sections connected by a hinge-fixing. f: knotted, the base is mini-like. A two-part cu with the possibility of moving, for example, turning them in one plane relative to the other, a tension mechanism is introduced connected to two base parts, and the waveguide fastening to the base is made in the form of hinges mounted on the ends of the first and last waveguide sections. . 2. The antenna according to claim 1, characterized in that the hinge-fixing-i knot contains brackets mounted symmetrically on the narrow walls of each section of the waveguide, with the first brackets of two adjacent sec of the waveguide connected by a hinge, the first bracket is one second; the water is coaxial with the hinge, the cam is rigidly fixed, and the second bracket of this section of the waveguide is equipped with a pin; on the second bracket of the other section of the waveguide, a twist, hook and dog are set on one axis, the working surface of which is connected through a rod the distance from the axis of the waveguide to the axis of the hinge is equal to the distance from the axis of the waveguide to the axis of the hook and to the axis of the pin. (Jkftj iitar 7 L ss / J U 1 s 0ut.y Q9 Ha Lj 3e r. i { Lj h o