SU598489A1 - Aerial - Google Patents

Description

I

The invention relates to the field of antenna technology and can be used on microwave communication lines.

Two-channel antenna systems are known for radio-relay communication lines, which are two antenna-separated antennas, two waveguide paths, two receiving devices, and a receiving signal auto-selection unit (I.

However, two separate antennas are required for known dual-reception antennas, which greatly increases the cost of the line. In addition, the weight and, especially, wind loads on the support on which the antennas are located are increasing, which makes it necessary to use more rigid and expensive supports.

It is also known an antenna device comprising a mirror, an irradiator made in the form of a system of adjacent horns, and receivers 2.

However, in such an antenna, each elemental irradiator irradiates the entire surface of the reflector, which allows creating the necessary amplitude-phase distribution in the aperture, but does not allow to provide two independent reception channels and a certain level of the receiving signal, which can lead to communication deterioration, and in some cases, to a complete breakdown of communication on the line.

The purpose of the invention is to provide an increased signal level in one of the receivers, i.e., increase the stability of the communication.

This goal is achieved due to the fact that the horn feed used in the proposed antenna device is divided by a partition into two parts, each of which irradiates its antenna part, and the receivers are connected to the common and antiphase outputs of the double waveguide bridge, the horn portions are connected to the side arms.

In addition, in the device, in order to reserve one of the receivers, a phase shifter is installed between one of the horn parts and the bridge.

FIG. 1 shows the proposed antenna device, a variant of a horn-parabolic antenna; in fig. 2 -, the same, a variant of the periscopic antenna system.

Claims (2)

The amplitude and phase distribution of the incoming signal along the vertical axis of the aperture of the antenna corresponds to the moment of a weak interference fading. The signals from the top and bottom halves of the antenna are the same in level and opposite in phase. The simple addition of these signals leads to a zero signal level at the antenna output. In the proposed device, the signals from the upper and lower halves 1a and 16 of the reflecting surface of mirror 1 are respectively separated by installing a metal partition 2 in a horn irradiator 3. Signals from the upper part of the reflecting surface arrive at the side arm of the AdVoy waveguide bridge 4, and the signal from. the lower part - to the second side ple40 In the same tee .. In the period of single-beam reception, the signals from the upper and lower halves of mirror 1 at the outputs of the horn 3 are the same in magnitude and in phase: PonaKt ... Repr.k. .g is the power of the receiving signal from each half of the mirror), In the I-arm there is a full signal of 2Pa7) s .., .. and on the shoulder, it is completely absent. Such a distribution of the signal between the shoulders of the tee waveguides is undesirable, since the possibility of stationary redundancy of the receiving equipment is eliminated. To eliminate this drawback, a phase shifter 5 is inserted into one of the horn outputs and a waveguide bridge. If there is a phase shifter, the signals from the upper and lower halves of the mirror are the same in magnitude and in phase at the horn outputs, they approach the arms of the m. equal in magnitude, but with some phase difference. If the phase difference is assumed to be, for example, 60 °, then at the output of the D-arm the signal level is 1.5 Pspok.-3 at the output of the C-arm-0.5 Pc o. ;. Such a redistribution of the total receiving signal allows station-wise redundancy of receivers, connected to the outputs I and. During the period of deep interference fading, when the signals from the upper and lower parts of the antenna are the same in magnitude and opposite to the phase, the difference between the phases of the horn outputs is 120 °, respectively, at the output of the C arm, the signal level is 1.5 receiving power. signal from each half of the antenna, and at the output of the D-arm - 0.5. . A necessary condition for ensuring the stability of the connection a1 is the combination of the phase centers of individual antennas in the case of using the known antenna devices. Otherwise, two signals with different delay times enter the receiver, which worsens the quality of communication. In the invention, this problem is solved by dividing the irradiator with a septum, with the focal distances of the irradiated parts of the mirror being equal, and the focal axes and foci coincide. With deep interference interference, the signal level in one of the arms () is 20–30 dB higher than the signal from an ordinary horn-parabolic antenna. The use of the invention in periscopic antenna systems makes it possible to reduce the influence of associated flows that are present in such systems due to their low noise immunity. Claim 1. Antenna device comprising a mirror, a horn feed and receivers, characterized in that, in order to ensure stability of communication, the horn feed is divided by a partition into two parts, each of which has its own part of the mirror, and focal axes. and the foci of the irradiated parts of the mirror coincide, and the focal distances are equal ,. the outputs of the horn parts are connected in phase to the pylons of the double-waveguide bridge, to the in-phase and anti-phase outputs of which, respectively, but the receivers are connected. . 2. A device according to claim I, wherein; which, in order to ensure the reservation of receivers, a constant phase shifter is switched between one of the parts of the horn and the bridge, -. Sources of information taken into account in the examination}. Engineering and Technical Reference for Electric Communications. Radio relay lines., M.,. “Holy Day, 1971. 2. Kyun R. Microwave antennas, “Shipbuilding, 1967, p. 356--357.