SU1336142A1 - Antenna unit - Google Patents

Abstract

The invention relates to antenna technology. The purpose of the invention is an extension of the frequency band of the isolation. The antenna device contains two aperture antennas (AA) 1 and 2, the apertures of which are located in the same plane 3, and a segment 4 of the surface wave. AA 1 is made in the form of a pyramidal horn, and segment 4 is placed on its inner wall facing AA 2. At the same time, a segment of 4 m. made either in the form of a dielectric plate with specified dimensions (thickness, width and length), or in the form of a metal ribbed structure with a given edge height. An electromagnetic wave emitted into free space by a pyramid horn in the plane of apertures AA 1 and 2 will have a direction of propagation, forming a certain angle with the line connecting the centers of apertures AA 1 and 2. The fraction of the energy of an electromagnetic wave radiated by AA 1 and falling into AA 2 will decrease. With the selected length of the dielectric plate and the height of the ribs of the metal ribbed structure, the magnitude of the isolation between the frequency, i.e. Expansion of the frequency band. The device according to Clauses 2 and 3 of the f-crystals is characterized by the fulfillment of the length of 4. 2 Il. (L oo with O5 ke figure 1

Description

The invention relates to antenna technology and can be used in radio systems where isolation is required in a wide frequency band between a horn antenna with a rectangular aperture and a second aperture antenna whose apertures lie in the same plane.

The purpose of the invention is an extension of the frequency band of the isolation.

FIG. 1 shows an antenna device in a crane, a general view, in FIG. 2, an aperture antenna made in the form of a pyramidal horn, a general view.

The antenna device contains two aperture antennas 1 and 2, the apertures of which are located in one plane 3, and a segment 4 of the surface wave line. One of the aperture antennas 1 is made in the form of a pyramidal horn, and a segment 4 of the surface wave line is placed on its inner wall facing the second aperture antenna 2, and is made in the form of a dielectric plate, the dimensions of which are chosen from the ratios: width d 0.35 D,

length 2 - Tillfi p-ftfJ

thickness t 0,25Я / "fi - 1, where-D is the linear size of the edge of the pyramidal horn, facing the second aperture antenna,

and a are constant wave propagations in the pyramidal horn and over the line of the wave surface, respectively, L is the wavelength, -j- is the dielectric constant of the dielectric plate.

The edge of the dielectric plate is aligned with the edge of the pyramidal horn, the dielectric plate being offset from the plane of symmetry of the antenna device passing through the centers of the apertures of the aperture antennas G and 2.

Segment-4 lines of the surface wave can also be made in the form of a metal ribbed structure, the height of the edges of which is chosen from the ratio h 0.2 L.

Antenna device operates as follows.

An electromagnetic wave whose polarization plane coincides with the plane of symmetry of the antenna device passing through the centers of the apertures of aperture antennas 1 and 2 propagates in the pyramidal horn and radiates into free space. At the same time, the propagation speed of the electromagnetic wave in the free part of the pyramidal horn and in the part of the pyramid horn adjacent to the dielectric plate is not the same, which leads to the symmetry breaking of the amplitude-phase distribution at the edge of the pyramid horn facing the second aperture antenna 2. As a result, the wave is electromagnetic emitted by the pyramid horn, in the aperture plane of the aperture antennas 1 and 2 will be

have a direction of propagation that forms a certain angle with the line connecting the centers of the apertures of the aperture antennas 1 and 2. The fraction of the energy is electromagnetic

the wave emitted by the aperture a; the antenna 1 and entering the aperture antenna 2 decreases. With a selected dielectric plate length and height

edges of the metal ribbed structure, a smaller dependence of the separation value on the frequency, i.e. Expansion of the frequency band.

35

Claims (3)

1. Antenna device containing two aperture antennas, the apertures of which are located in the same plane, and the switching element, made in the form of a surface line segment. waves offset from the plane of symmetry of the antenna device, the passage Antenna centers through the centers, which is characterized by the fact that, in order to expand the junction frequency band, one of the aperture antennas is made in the form of a pyramidal horn, and a section of the surface wave line is placed on its inner wall facing the second aperture antenna, the edge of the line segment of the surface wave is combined with the edge of the pyramidal horn, and the dimensions of the line surface wave segment are chosen from the ratios: width d 0.35 D, length 1/1 / ip- Rear, / rI 31336 where D is the linear size of the edge of the pyramidal horn facing the second aperture antenna; p is the constant propagation of the wave in the pyramidal horn and above the surface wave line, respectively. 2. Device by. Section 1, that is, that part of the line of the surface wave is made in the form of a dielectric plate, the thickness of which is chosen from the ratio 142 t 0,25 / 1 / VE - 1 where l is the wavelength, j is the relative dielectric constant of the dielectric plate. 3. The device according to claim 1, characterized in that the section of the line of the surface wave is made in the form of a metal ribbed structure, the edges of which are chosen from the ratio h 0,2D. f FIG. 2 Editor A. Kozoriz Order 4053/51 Compiled by A. Runge Tehred M. Didyk Corrector Circulation 625 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., Up to 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader M. Demchik