SU1158949A1 - Device for measuring antenna directional pattern - Google Patents

Abstract

A DEVICE FOR MEASURING AN ANTENNA DIRECTION DIAGRAM, containing a SACh generator, to the output of which a probe antenna is connected, a turn-turn support mechanism for accommodating the antenna under investigation, a rotation-support mechanism rotating drive, a series-connected receiver whose input is the output of the antenna being studied, an integrator, a converter analog code and cathode ray tube, the synchronization input of which is connected to the output of calibrated signals of the synchronization unit, which triggers the output It is convenient to control the input of the rotational support mechanism, which is aimed at improving the accuracy in determining the direction of the maximum of the antenna pattern, the detector’s output is connected to the receiver output, the first electronic key, the control input of which is connected with the output of the calibration signals of the synchronization unit, the delay line, the subtraction unit, the second input of which is connected to the output of the first electronic key, valve, AND-NES element, the second electronic the key, the secret unit, the descrambler and the recorder, between the control input of the first electronic key and the control INPUT of the second electronic key is turned on, the counter reset input is connected to the trigger output of the synchronization unit and a reset output of the memory block. 00 with 4Sb WITH

Description

The invention relates to the technique of antenna measurements and can be used when measuring the parameters of antennas in the far-field zone on automated measurement stands. A device for measuring antenna radiation patterns, containing a rotary stand with an antenna under investigation, is known, whose rotational speed is synchronized with the signal sweep speed in the recording unit using a control unit, a high-frequency signal generator, output connected either to the antenna under test or to a probe antenna. rigidly fixed with respect to the gate stand D1 The known device for measuring radiation patterns of the antenna does not allow the automatic mode of measure the direction of the main maximum radiation patterns of the studied antenna. The closest technical solution to the invention is a device for measuring the antenna radiation pattern, which contains a microwave generator, to the output of which a probe antenna is attached, a rotary support mechanism for accommodating the antenna being studied, a rotation-support rotary drive, connected in series, the input of which is is the output of the antenna under study, the integrator, the analog-code converter and the electron-beam tube, the synchronization input ijo is connected to the calibration output with a signal The alov of the synchronization unit, whose 1191st output is connected to the control input of the rotary support mechanism 2 J-. . The known device is inherently not sufficiently high in determining the direction of the maximum radiation pattern of the antenna under study. The purpose of the invention is to improve the accuracy in determining the direction of the maximum of the radiation pattern of the antenna under study. Delivered. The goal is achieved by the fact that in a device for measuring the radiation pattern of antennas containing a microwave generator, to the output of which a probe antenna is attached, a turn-turn mechanism to accommodate the antenna under study, a turn-turn turner drive, connected in series, the receiver the output of the antenna under study, the integrator, the analog code converter and the cathode ray tube, the synchronization input of which is connected to the output of calibration signals i block: synchronization, triggering the output of which is connected to the control input of the rotary-rotary drive, the peak detector, the first electronic switch, the control input of which is connected to the output of the synchronization glare calibration signals, delay line, subtraction unit, the second input of which is connected to the output of the receiver; the output of the first electronic key, valve, NAND element, the second electronic key, the storage unit, the decoder and the recorder, between the control input of the first electronic key and the control input the house of the second electronic key is turned on the counter, the reset input of the counter is connected to the triggering output of the synchronization unit and the reset input of the storage unit. In the drawing, a structural electrical circuit of the device for measuring the antenna radiation pattern is presented. UC: An antenna radiation measuring unit contains a microwave generator 1, a probing antenna 2, a test antenna 3, a turn signal mechanism 4, a receiver 5, an integrator 6, an analog-code converter 7, cathode ray tube 8, peak detector 9, first electronic key 10, synchronization unit 11, subtraction unit 12 delay line 13, second electron. key 14, valve 15, element AND-HER 16, counter 17, storage unit 18, decoder 19, recorder 20, 2T rotary actuator. A device for measuring the radiation pattern of the antenna operates as follows. From the microwave generator 1, the high frequency oscillations arrive at the input of the probe antenna 2. Probing

An antenna 2 emits electromagnetic waves in the direction of the antenna 3 under investigation. With the help of the rotary support mechanism 4 and the rotation drive 21, the antenna 3 is rotated continuously during the measurement of the radiation pattern. The speed of the circular scanning of the electron-beam tube 8 was rigidly synchronized with the speed of the rotary support mechanism 4 using calibration signals from the synchronization unit 1 1. Calibration signals are continuously counted by counter 17. The high-frequency signal at the output of the antenna 3 under investigation is proportional to the value of its radiation pattern 1 for the corresponding elevation angle measured with respect to the probe antenna 2. The receiver 5c of the output of the antenna 3 is amplified and transformed by the integrator 6 and the analog-code converter 7 to the radial sweep signal of the cathode ray tube 8. The electron beam on the cathode ray tube 8 is deflected at every moment of time nor along the radial direction by an amount proportional to the signal at the output of the antenna under study 3. As a result, the radiation pattern of the antenna under study 3 is displayed on the screen of the cathode ray tube 8. At the same time, the signal from the output of the receiver 5 is fed to the input of the peak detector 9. The voltage at the output of the peak detector 9 is proportional to the maximum signal from: the output of receiver 5, i.e. proportional to the amplitude of the main lobe of the direction / frequency diagram of the antenna under study. After reaching the maximum, the output voltage of the peak detector 9 slowly decreases exponentially from the time constant of the peak detector 9. The voltage from its peak. arrives at the first electronic key 10, with the help of which the signal is sampled at the frequency received from the synchronization unit 1t by a sync pulse. The discrete signal is fed to the two inputs of the block 12

1589494

on one of the inputs through line 13 delay. At the output of subtraction unit 12, different-tonal pulses appear. Of these pulses, only negative polarity pulses are passed to the second 5 electronic key 14, which provides a return on valve 15. Negative polarity pulses indicate that the voltage at the output of the peak detector 9 rapidly increases during the delay time of the signal in line 13 delays. This is observed when the antenna under investigation

15 3 is oriented by the maximum of its radiation pattern towards the probe antenna 2. The accuracy of determining the maximum of the radiation pattern is the higher, the more constant the time of the discharge pi is. detector 9, i.e. the slower it is discharged. At the same time, this constant is constant, to be less random fluctuations in the electrical circuits of the device. The signal from the valve 15, formed by the I-BE 16 element, briefly opens the second electronic key, through which information about the direction of the maximum from the output of the counter

17 is rewritten in the memorizing unit 18. After a complete rotation of the rotary support mechanism 4, the synchronization unit 11 generates a pulse at its second output, which resets the counter 17 to zero and gives a signal to the storage unit

18 in the output of measurement results through the decoder 19 to the indication which is carried out on the recorder 20. The recorder 20 displays in any desired form

1 the direction of the maximum of the radiation pattern j of the antenna being studied. 5 ™ 3Using the proposed device for measuring the radiation pattern. The antenna. Permits 0 em.

direction of the chart maximum. directivity, which reduces the laboriousness of processing the diagrams & n, the directivity of the antenna and also increases the accuracy and efficiency of the study of antennas.

Claims (1)

A DEVICE FOR MEASURING ANTENNA DIAGRAM, comprising a microwave generator, to the output of which a probing antenna is connected, a rotary support mechanism for placing the antenna under study, a rotary support rotary mechanism, a receiver connected in series, the input of which is the output of the antenna under investigation, an integrator, a converter analog code and cathode ray tube, the synchronization input of which is connected to the output of the calibration signals of the synchronization unit, the trigger output of which is connected to the control input of the rotation drive of the Slewing-rotary mechanism, characterized in that, in order to increase accuracy when determining the direction of the maximum radiation pattern of the antenna under investigation, a peak detector is connected to the output of the receiver, the first electronic key whose control input is connected to the output of the calibration signals of the unit synchronization, delay line, subtraction unit, the second input of which is connected to the output of the first electronic key, valve, element 5 AND-NOT, the second electronic key, I remember s unit, decoder and recorder, between, on the control input of the first electronic switch and the control input of the second electronic switch · included counter, the counter reset input coupled to the trigger output of the synchronization unit and the output of the memory block reset · 6H8SII '