RU2673436C1 - Non-inclined multibeam two-mirror antenna of irradiated radiation - Google Patents

Non-inclined multibeam two-mirror antenna of irradiated radiation Download PDF

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Publication number
RU2673436C1
RU2673436C1 RU2017140172A RU2017140172A RU2673436C1 RU 2673436 C1 RU2673436 C1 RU 2673436C1 RU 2017140172 A RU2017140172 A RU 2017140172A RU 2017140172 A RU2017140172 A RU 2017140172A RU 2673436 C1 RU2673436 C1 RU 2673436C1
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Russia
Prior art keywords
arc
reflector
inclined
plane
irradiators
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RU2017140172A
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Russian (ru)
Inventor
Михаил Анатольевич Сомов
Константин Михайлович Волгаткин
Анатолий Михайлович Сомов
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Федеральное государственное унитарное предприятие Ордена Трудового Красного Знамени научно-исследовательский институт радио
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements

Abstract

FIELD: antenna equipment.
SUBSTANCE: non-inclined multibeam two-mirror antenna of the irradiated radiation consists of a system of irradiators located on the arc of the circumference whose plane is inclined relative to the horizontal plane, main mirror-reflector in the form of a parabola in the plane orthogonal to the plane of arc of arrangement of the irradiators, an auxiliary mirror-counter-reflector in the form of a coaxial parabola of an ellipse concave towards the reflector, sections of which in the plane of arc of irradiators are circumferences concentric to the arc of radiators and having, compared thereto, larger and smaller radii, respectively, the arc of the circumferences of the irradiators passes through the focus of the ellipse, which is close to the reflector. Wherein the forming parabola and the ellipse are asymmetric relative to the arc plane of the irradiator circumference, and the irradiators are inclined to the focal axis.
EFFECT: technical result consists in increasing the efficiency of the antenna while simultaneously transmitting and receiving information from artificial Earth communication satellites located on an inclined part of the geostationary orbit (GSO).
1 cl, 5 dwg

Description

The invention relates to the radio engineering field and is intended for use as terrestrial antennas with microwave transmitters in the geostationary orbit (GSO) for simultaneous operation with several artificial Earth satellites (AES) located on the inclined part of the geostationary orbit.

The invention is intended for use in the composition of radio complexes of earth stations of satellite communications for satellites on the inclined part of the GSO. It can be used for transmission and reception of television, broadcasting and radio communications in the VHF, UHF and microwave ranges. Non-inclined multi-beam two-mirror toroidal parabolic antennas are known, consisting of a main reflector mirror in the form of a part of an inclined parabolic torus and an auxiliary counterreflector mirror in the form of a part of an elliptic torus coaxial to the reflector and a system of irradiators located on an arc of a circle. Such antennas make it possible to form a fan radiation pattern (DD) for simultaneous radio communication with several satellites on the inclined part of the GSO. The disadvantages of such an antenna include reduced efficiency due to the shielding of part of the reflector surface by a counter-reflector and the reaction of the counter-reflector to the irradiator, causing loss of electromagnetic energy.

A non-inclined multi-beam, two-mirror antenna of remote radiation of increased efficiency is proposed. The antenna consists of a system of irradiators located on an arc of a circle inclined at an angle equal to the angle of inclination of the serviced GSO sector, a main reflector mirror having in the plane orthogonal to the circular arc plane, a parabola shape and an auxiliary counterreflector mirror in the form of a coaxial ellipse concave parabola towards the reflector, the sections of which in the plane of the irradiator arc are circles, concentric to the irradiator arc and having larger and smaller radii in comparison with it, respectively And irradiators circumference arc passes through the focus of the ellipse, close to the reflector. The cross sections of the reflector and counterreflector are asymmetric with respect to the plane of the arc of placement of the irradiators, inclined to the focal axis common to the reflector and counterreflector.

Known two-axis axisymmetric antennas with a paraboloid reflector, a counter-reflector in the form of a part of an ellipsoid, one of the foci of which coincides with the focus of the paraboloid, and in the second focus is a weakly directed irradiator (Gregory scheme) [1]. The disadvantage of this antenna is a single radiation pattern.

Known non-inclined multi-beam two-mirror toroidal-parabolic antennas for working with satellite satellites located on the inclined part of the geostationary orbit (GSO) [2]. These antennas form a fan radiation pattern (LH) for simultaneous operation with several satellite communications on the inclined part of the GSO. The disadvantages of such an antenna include a significant decrease in efficiency due to the shadowing of part of the reflector by the counter-reflector and the reaction of the field reflected by the counter-reflector to the irradiator operation mode.

The technical result of the invention is to increase the efficiency of a non-inclined two-mirror antenna while maintaining a fan beam pattern.

For this purpose, a non-inclined multi-beam, two-mirror remote radiation antenna of increased efficiency is proposed, consisting of a system of irradiators located on an arc of a circle inclined at an angle equal to the angle of inclination of the serviced GSO sector, a main reflector mirror having a plane in the plane orthogonal to the circular arc, the shape of a parabola and an auxiliary mirror-counterreflector in the form of a coaxial parabola of a segment of an ellipse concave towards the reflector, the sections of which in the plane of the irradiator arc appear they are circles concentric to the irradiator arc and having larger and smaller radii as compared with this arc, and the irradiator circle arc passes through the focus of the ellipse close to the reflector, while the sections of the reflector and counterreflector are asymmetric with respect to the plane of the arc of the irradiators inclined to the focal axis reflector and counterreflector.

The invention is illustrated by drawings, in which:

FIG. 1 - non-inclined multi-beam two-mirror antenna of the exposed radiation, view from the side of the counter-reflector, where:

- reflector - 1;

- counterreflector - 2;

- irradiators - 3;

- vertical plane - 4;

- horizontal plane - 5;

- inclined axis - 6. Inclined axis 6 is orthogonal to the direction of the inclined serviced GSO section and tangent to the parabola at its apex in the center of reflector 1;

- inclined axis - 7. Inclined axis 7 is orthogonal to axis 6;

- the inclined axis - 8. The inclined axis 8 is tangent to the parabola at its apex, parallel to axis 6, located along axis 7 to the left of axis 6;

- inclined axis - 9. Inclined axis 9 is tangent to the parabola at its apex, parallel to axis 6, located along axis 7 to the right of axis 6;

- an arc of placement of irradiators - 10;

- directions of the partial rays of the antenna - 11;

- the direction of the focal axis is 12;

- FIG. 2 - section of the antenna by a plane passing through the inclined axis - 6 and the center of the circumference of the irradiators 3, where

- 12 - the focal axis of the section;

- FIG. 3 - section of the antenna by a plane passing through the inclined axis - 9 and the center of the circumference of the location of the irradiators 3;

- FIG. 4 - section of the antenna by a plane passing through the inclined axis - 8 and the center of the circumference of the location of the irradiators 3;

- FIG. 5 - multi-beam non-inclined two-mirror antenna of the exposed radiation, sectional view by a plane orthogonal to the inclined axis - 6, passing through the inclined axis - 7 and a point on the focal axis of the paraboloid, two focal distances from its vertex.

Non-inclined multi-beam two-mirror antenna of the irradiated radiation according to the Gregory scheme with a reflector 1 in the form of an inclined parabolic torus with a counter-reflector 2 in the form of an inclined elliptical torus (Fig. 1) with matching focal axes with generators in the form of asymmetric parabola and ellipse, contains an irradiator 3 and the like focal points of the ellipse closest to the apex of reflector 1 and inclined to the focal axis.

When connected to the irradiator 3 and the like, inclined to the focal axis and placed on the arc of the irradiators 10 of the high-frequency generator, the irradiator 3 emits an electromagnetic field in the direction of the center of the counter-reflector 2 and in the direction of its upper and lower edges, which in the geometrical optical sense can be considered as rays. After reflection from the upper and lower edges of the counter-reflector 2, these rays, like all others, intersect at the focus of the ellipse, remote from the reflector 1, which coincides with the focus of the parabola (Fig. 2 and 5).

Due to the properties of the two-mirror Gregory scheme, directional radiation is formed in the form of a spherical wave along the focal axis of the system in this section. In the plane of the placement arc, this partial radiation pattern is somewhat expanded due to phase distortions caused by the difference in the cross-section of the reflector in this plane from the parabolic.

A similar directional radiation along the focal axis of the section - 12 is formed in other cross sections (Fig. 3 and 4). Since the plane of the arc of the circumference of the location of the irradiators - 10 is inclined, the fan of the partial radiation patterns of the antenna 11 is inclined in accordance with the inclination of the GSO section. The proposed antenna (Fig. 2, 3, 4) refers to antennas with remote radiation. A valuable property of such antennas is the low noise temperature at small angles to the horizon [3, p. 355], which occurs when working on the inclined part of the GSO.

Due to the fact that the cross-section of the reflector and the counter-reflector are asymmetric with respect to the plane of the arc of the irradiators inclined to the focal axis, the counter-reflector 2 and the irradiators 3 are removed from the field reflected by the reflector 1 in the region of its reduced intensity, the shadowing of the reflector is reduced, as well as the reaction of the mirror to the irradiator . This increases the resulting utilization of the surface, and also lowers its noise temperature and thereby increases the efficiency of the antenna while maintaining fan radiation patterns.

Literature

1. Eisenberg G.Z., Yampolsky V.G., Tereshin O.N. VHF antennas. Ed. G.Z. Eisenberg in 2 hours, part 2, - M .: Communication, 1977, - 288 pp., Ill.

2. Somov A.M. Propagation of radio waves and antennas of satellite communication systems. - M .: Hot line - Telecom, 2015 .-- 456 p.: With ill.

3. A.M. Somov, R.V. Kabetov. Design of antenna-feeder devices. Ed. professors A.M. Somova - M.: Hot line - Telecom, 2015 .-- 500 p., With silt.

Claims (1)

  1. Non-inclined multi-beam two-mirror antenna of remote exposure, consisting of a system of irradiators located on an arc of a circle inclined at an angle equal to the angle of inclination of the serviced sector of the geostationary orbit, the main reflector mirror having a plane in the plane orthogonal to the plane of the circular arc, the shape of a parabola, and an auxiliary mirror counterreflector in the form of a coaxial parabola of a segment of an ellipse concave towards the reflector, the sections of which in the plane of the irradiator arc are circles, conc in the arc of the irradiators and having larger and smaller radii in comparison, respectively, and the arc of the circle of irradiators passes through an ellipse focus close to the reflector, characterized in that the sections of the reflector and counterreflector are asymmetric relative to the plane of the arc of the irradiators, inclined to the focal axis of the reflector and counterreflector .
RU2017140172A 2017-11-20 2017-11-20 Non-inclined multibeam two-mirror antenna of irradiated radiation RU2673436C1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828352A (en) * 1971-08-09 1974-08-06 Thomson Csf Antenna system employing toroidal reflectors
RU2173496C1 (en) * 2000-07-10 2001-09-10 ВЕЙВФРОНТИЕР Ко., Лтд. Mirror antenna
RU2380802C1 (en) * 2008-11-17 2010-01-27 Джи-хо Ан Compact multibeam mirror antenna
RU2446524C1 (en) * 2011-02-28 2012-03-27 Федеральное государственное унитарное предприятие Ордена Трудового Красного Знамени научно-исследовательский институт радио Multibeam double-reflector antenna for receiving signals from satellites on edge of visible geostationary orbit sector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828352A (en) * 1971-08-09 1974-08-06 Thomson Csf Antenna system employing toroidal reflectors
RU2173496C1 (en) * 2000-07-10 2001-09-10 ВЕЙВФРОНТИЕР Ко., Лтд. Mirror antenna
RU2380802C1 (en) * 2008-11-17 2010-01-27 Джи-хо Ан Compact multibeam mirror antenna
RU2446524C1 (en) * 2011-02-28 2012-03-27 Федеральное государственное унитарное предприятие Ордена Трудового Красного Знамени научно-исследовательский институт радио Multibeam double-reflector antenna for receiving signals from satellites on edge of visible geostationary orbit sector

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