SU1125682A1 - Four-ridge horn aerial - Google Patents

Abstract

Horn CHETYREHGRVBNEVAYA antennas soderzhashih pnramndalny mouthpiece on vnutrennnh wall of which | h along Hx axes snmmetrny two pairs veanmno perpendnkul p GOVERNMENTAL hrebney, cut rectangular waveguide prnsoednnenny to gorlovnne pnramndgshnogo speaker, n two outer coaxial connector of t l n h and o bt a, so that in order to reduce the axial length of the four-ridge horn antenna while maintaining the size and opening angle without reducing the working frequency band in the decimeter and meter bands, two symmetries were introduced Traversing devices located outside the rectangular waveguide, their symmetrical inputs are connected by segments of coaxial cable of equal length with additional coaxial connectors located on the rear wall of the rectangular waveguide, opposite each of the mutually perpendicular ridges, and the outputs to external coaxial cables. connectors, with each i of mutually perpendicular ridges (L is connected by a conductor segment of a two-wire line through an opening in the back wall of the rectangular segment waveguide with a corresponding additional coaxial connector.

Description

f

This invention relates to radio engineering, namely, to antenna systems.

A known four-ridge horn antenna, comprising a horn with two mutually perpendicular ridges, a waveguide section and two coaxial connectors ffj.

The lack of antenna - large axial length, especially at frequencies below 2 GHz.

Closest to the invention of the YaEl, is a four-ridge horn antenna containing a pyramidal horn, on the inner walls of which two pairs are located along their axes of symmetry, mutually perpendicular ridges, a segment of a rectangular waveguide attached to the neck of the pyramidal horn, and two outer coaxial connectors 2.

The disadvantage of the known horn chetyrehgrebnevoy antenna - large axial length (and, especially in the range of decimeter and meter waves.

The purpose of the invention is to reduce the axial length of the horn four-groove antenna while maintaining the dimensions and angle of the cable without reducing the working frequency band in the decimeter and meter bands.

To achieve this goal, a four-heel antenna consisting of a pyramidal horn, on the inner walls of which, along their axes of symmetry, there are two pairs of mutually perpendicular ridges, a segment of a rectangular waveguide attached to the throat of the pyramidal horn and two outer coaxial connectors, entered, and entered, and entered, and entered the horn, and entered the two outer coaxial connectors. transformer located outside the segment of the rectangular waveguide, and their symmetric cables are connected by coac segments of equal length with the additional cable coaxial connectors located on the rear wall of a rectangular waveguide segment, opposite each other of mutually perpendicular ridges, and the outputs to the outer coagular connectors, each of the mutually perpendicular ridges connected by a two-wire conductor segment through an opening in the rear wall of the segment rectangular waveguide with a corresponding additional coaxial connector.

Fig, 1 shows the structural scheme of the proposed antenna; 2 is the same, rear view, Antenna —contains a pyramidal horn 1, on the inner walls of which there are two pairs of mutually perpendicular ridges 2, a segment 3 of a rectangular waveguide, two outer coaxial connectors 4, two balun transformers 5, 0 lengths b of coaxial cable of equal length j additional coaxial connectors 7, lengths 8 of conductor of a two-conductor line passing through holes in the rear wall 9 from 5 and cutting 3 of a rectangular waveguide.

The antenna works as follows. , ,. ,,.,

When an electromagnetic wave propagates along the axis of the pyramidal horn 1, the electromagnetic field is localized mainly between the edges of two pairs of mutually perpendicular ridges 2. In this case, the highest ones. the types of waves are practically non-exciting. 5, because the excitation voltage with the help of segments 8 conductors of a two-wire line adjoins the edges of two pairs of mutually perpendicular ridges 2,

Use baluns

transformers 5 in combination with a Bb1 high-impedance symmetrical two-wire line for the excitation of a four-ridge horn antenna provides the possibility of a smooth conversion,

calling impedance from 200 ohms in the throat to 400 ohms in the aperture (in the known four-ridge horn antennas, excited by a coaxial line, it is necessary to convert the impedance from 50 to 400 ohms) with a smaller axial length of the antenna. Since the size of the neck of the pyramidal horn 1, angle of the opening and the ratio

5, the height of the ridges to the size of the neck is maintained, the working frequency band remains unchanged.

Thus, the invention makes it possible to reduce the axial length of a horn four-ridge antenna with. about 3 times while maintaining the working frequency band in the decimeter and meter bands.

The technical and economic effect of the image consists in the possibility of creating small portable measuring antennas for the decimeter and meter ranges.

FIG. 2

Claims (2)

HORNE FOUR-CROWN ANTENNA, containing a pyramidal horn, on the inner walls of which are two pairs of mutually perpendicular ridges along the axis of symmetry, a segment of a rectangular waveguide attached to the neck of the pyramidal horn, and two external coaxial connectors, which is different in that the length of the horn four-ridge antenna while maintaining the size and aperture angle without reducing the working frequency band in the decimeter and meter ranges, two balancing transfo rmator located outside the segment of a rectangular waveguide, and their symmetrical inputs are connected by segments of coaxial cable of equal length with additional coaxial connectors located on the rear wall of a segment of a rectangular waveguide, opposite each of the mutually perpendicular ridges, and the outputs to the external coaxial connectors, each <g of mutually perpendicular ridges is connected by a segment of a conductor of a two-wire line through an opening in the rear wall of a segment of a rectangular waveguide with the corresponding additional coaxial connector. SU „, 1125682 Figure 1 presents the structural diagram of the proposed antenna; in Fig.2 - the same rear view. The antenna contains a pyramidal horn 1, on the inner walls of which ^{5 there} are two pairs of mutually perpendicular ridges 2, a segment 3 of a rectangular waveguide, two external coaxial connectors 4, two balancing transformers 5, 10 segments 6 of an equal length coaxial cable j additional coaxial connectors 7, segments 8 of the conductor of the two-wire line passing through the holes in the rear wall 9 from 15 cutting 3 of a rectangular waveguide. The antenna works as follows. When an electromagnetic wave propagates along the axis of the pyramidal horn 1, the electromagnetic field is mainly localized between the edges of two pairs of mutually perpendicular ridges 2. The higher ones. the types of waves are practically not excited: 25, since the exciting voltage is applied to the edges of two pairs of mutually perpendicular ridges 2 using segments of 8 conductors of a two-wire line. The use of balancing transformers 5 in combination with a high-resistance symmetrical two-wire line for excitation of a four-crest horn antenna provides the possibility of smooth conversion ₍ 35 wave resistance from 200 Ohms in the neck to 400 Ohms in the aperture (in the known four-crest horn antennas excited by a coaxial line, 40 wave impedance conversion from 50 to 400 Ohms) with a shorter axial length of the antenna. 45 heights of ridges to the size of the neck are preserved, the working frequency band remains unchanged. Thus, the invention allows to reduce the axial length of the horn of a four-ridge antenna at. 3 times while maintaining the working frequency band in the decimeter and meter ranges. The technical and economic effect of the invention consists in the possibility of creating small-sized portable measuring antennas for the decimeter and meter ranges.