SU1297143A1 - Waveguide-slot aerial - Google Patents

Abstract

The invention relates to antenna technology. The purpose of the invention is to increase the antenna gain and decrease the side-lobe level. The antenna contains a rectangular waveguide (PV) I, in a narrow wall of which alternating inclined slots 2 are made, the distance between which is equal to 1/2 of the wavelength in the PV, and additional slots 3 extended in the middle between alternating inclined slots in the wide walls perpendicular to the edges of PV 1. The length h of the slit 3 in each wide wall is equal to (l, 5% -t) / 4, where t is the distance between the alternating sloping slits; 7 wavelength in free space. 1 il. f f

Description

1.1

The invention relates to antenna technology and can be used in radio systems.

The purpose of the invention is to increase the antenna gain and decrease the side lobe level.

The drawing shows a structural scheme of a waveguide-slot antenna.

The slit-wave antenna contains a rectangular waveguide 1, in a narrow wall of which alternating inclined slots 2 are made, the distance between which is half the length of the wave in the rectangular waveguide, and additional slots 3 made in the middle between alternating inclined slots in the narrow and wide perpendicular to the edges of a rectangular waveguide 1, and the length of the additional slit in each wide wall

h (1.51 - t) / 4, where t is the distance between alternatingly

sloping slits, - wavelength in free space.

Wave-gap antenna works as follows.

In a rectangular waveguide 1, a traveling-wave mode is excited, leading to excitingly inclined inclined slits 2 and the formation of a radiation pattern of the desired shape (determined by the angle of inclination, the depth of incision and the width of the slit 2).

Additional non-inclined slots 3 are cut along the streamlines on the inner surface of the narrow wall of the rectangular waveguide 1, therefore these 1 targets are excited only by currents induced by electromagnetic fields. neighboring active alternately inclined slots 2 on the external surface

.

Editor A.Lezhnina

Compiled by V.Sagach

Tehred A. Kravchuk Proofreader L. Patay

Order 788/57 Tiraz ": 626 Subscription VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

432

narrow walls of a rectangular waveguide.

The oscillation phase of an excited wave depends on the depth of incision — the length of the additional slit in the wide wall of the rectangular waveguide.

Experimentally established that with h (1,) / 4, the phase of oscillation of waves from additional slits 3 in the direction of maximum radiation of the antenna is equal to the phase of oscillations of active alternatingly inclined slits 2.

As a result, an antenna is formed of an in-phase emitter c. a halving pitch between the radiators and a twofold increase in the number of slots, which provides an increase in antenna gain and a reduction in side lobe level.

Claims (1)

Invention Formula Waveguide-slit antenna containing a rectangular waveguide, in a narrow wall of which alternating inclined slots are made, the distance between the short is half the wavelength in the rectangular waveguide, characterized in that, in order to increase the gain and decrease the side lobes, Additional chips are inserted in it, which are made in the middle between alternatingly inclined gaps in the narrow and wide walls perpendicular to the edges of the rectangular waveguide, the length of the additional gap in each wide wall h (1,5 - t) / 4 where t is the distance between alternatingly sloping gaps; - wavelength in free space.