SU1125559A1 - Method of determination of radiation horn phase centre - Google Patents

Abstract

A METHOD FOR DETERMINING A PHASE CENTER OF A RADIATOR RUPOR, powered by a waveguide, based on the excitation of a radiating horn under study and measuring the parameters of a microwave signal reflected from an auxiliary screen, is measured in order to improve accuracy and reduce labor intensity. the dependence of the phase of the microwave signal reflected from the auxiliary screen with sequential, step

Description

The invention relates to the technique of antenna measurements and can be used to determine the phase center of a horn.

There is a known method for determining the phase center of a horn, based on measuring the phase diagram of 1SP1. Of the direction of the horn, which implies that the microwave signal from the generator is divided each time towards the reference channels, the microwave signal from the measuring channel is emitted, and located on a rotating stand, the axis of which passes through a horn, and connecting by means of a rotating joint with a phase meter, the dependence of the phase shift IU is removed; the reference and measurement channels from the angle of rotation of the antenna and determine the phase center of the horn,

The disadvantages of the method are the low accuracy of determining the phase center of the horn, the considerable laboriousness i is a large investment of time spent on measurements.

The closest to the invention of Gshlet. method for determining the phase of the radiating horn, fed by a waveguide, based on Bozbu zrennr investigated pyFiopa radiating and measuring the parameters of the microwave signal reflected from the auxiliary screen l.

PGdag PG of a known method of low measurement accuracy and great complexity.

Ilonb invention - the subtlety reduction and reduction of the complexity.

The goal is achieved by the method of determining the phase center of the radiating horns fed by the waveguide, based on the waveform of the radiating horn II being measured and measuring the microwave signal reflected from the auxiliary screen, measuring the dependence of the phase of the microwave signal S of the reflected set of the echo signal ioh screen in sequential, increments (O, 37 - Oj63); j zag-ing genres of the inner walls of the radiating horn under study, with the help of an auxiliary screen, the first phase reading is carried out when the auxiliary screen is installed in the plane of the emitting horn under investigation, and the last is in the plane of its connection with the supply waveguide, - d phase center of the investigated radiating horn relative to its opening by the formula

)

b (p-2p, e Lkr /

- lengths in free

where space;

g

-distance between extreme positions of auxiliary screen

l -2iif - wave number

 critical wavelength

in the supply waveguide, bt (is the phase difference with allowance for the whole number of periods between the first and last readings.

FIG. 1 shows a structural electrical circuitry of a test bench for determining the phase center emitting a horn; FIG. 2 - graphical dependencies that explain the definition of the phase center of the radiating horn under study according to the dependence of the phase of the microwave signal reflected from the auxiliary screen during its propagation in the powering waveguide of the radiating horn under study.

The definition of the phase center of the radiating horn under investigation according to the proposed method is based on the interpretation of the phase center as the boundary between the dispersion propagation of the signal in the waveguide and nondispersive propagation of the signal in free space.

The stand for determining the phase center of the radiating module contains the generator 1, a wave meter 2, a waveguide power divider 3, a directional coupler 4, a meter 5 phase radiating coil 6. The input of the primary channel of the directional coupler 4 is connected to the waveguide 7, and the secondary channel of the directional coupler 4 is connected to 5 phase meter. The stand also includes an auxiliary screen 8, fitted with a holder 9, and a device 10 for moving the screen 8,

The stand works as follows.

The signal from generator 1 is split in half using waveguide power dividers 3 between the measuring 11 and 12 reference channels. The signal of the measuring channel 11 after reflection from the auxiliary screen 8

Claims (1)

METHOD FOR DETERMINING THE PHASE CENTER OF THE RADIATING HORN, powered by the waveguide, based on the excitation of the studied emitting horn and measuring the parameters of the microwave signal reflected from the auxiliary screen, characterized in that, in order to increase the accuracy and reduce the complexity, measure the phase dependence of the microwave signal reflected from the auxiliary screen in sequential increments (0.37-0.63) (^ closure of the inner walls of the investigated emitting horn using an auxiliary screen, and the first phase When installing the auxiliary Nogo screen in the plane of the test radiating aperture of the horn, and the last - in the plane of the connections with its soybean feed waveguide, and determine the position of phase J cent ra radiating horn investigated with respect to its aperture by formula 7 wherein - the wavelength in free space, · Ά <ρ ^_ critical wavelength in the supply waveguide; iLp - phase difference taking into account an integer number of periods between the first and last samples, [) = 71) / ¾ is the wave number; B is the distance between the extreme positions of the auxiliary screen. FIG. 1> ί