SU1317372A1 - Device for measuring directional pattern of aerial - Google Patents

Abstract

The invention relates to antenna measurement techniques and ensures their accuracy. The device contains Gp 1 Wp frequency, transmitting antenna (PA) 2 on which there are two piezotransformers xcx 99ys sa66o x xxx gs s a6666a66Q6 ii33 gx: sweeper 3 connected to the output of g-4 vibration frequency and, through quadrature power divider 5, tested antenna (IA) 6, 7 7, 8-10 power dividers, four narrow-band 11-14-14 meters, tuned to the frequencies u) p, Sch + Java, Wo + 2Yans + 3Qj logarithmic y-15-17, adder 18, four blocks 19-22 subtraction, antilog. 22, bezekhovum camera 24. At the output of block 22, a signal is generated that is proportional to the signal coming from PA 2 in the absence of reflections in camera 24. Thus, the vibration of PA 2 in a plane perpendicular to the direction to IA 6 with frequency I J, filtering signals at frequencies i + p51, and reconstructing the spectra of the reflected and direct signals, make this device more efficient. with f (L NHKd with OO - ch | y

Description

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This invention relates to antenna measurement techniques.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a structural electrical circuit of the proposed device.

The device contains a microwave generator 1 of frequency Shd, transmitting antenna 2, on which are placed two piezo transducers 3, connected to the output of generator 4 of vibration frequency (I) through quadrature divider

5 power, test antenna 6, amplifier 7, first 8, second 9 and third 10 power dividers, first 11, second 12, third 13 and fourth 14 narrow-band amplifiers tuned to We + Java frequencies, and u) e + SON, first 15, the second 16 and third 17 logarithmic amplifiers, the adder 18, the first 19, the second 20, the third 21 and the fourth 22 subtraction units, the anti-log amplifier 23 and the anechoic chamber 24.

The device works as follows.

In the presence of reflections in the anechoic chamber 24 in the spectrum of the microwave oscillations fed to the test antenna

6 there will be components with the frequency coj, + n Slj, where n is an integer when the transmitting antenna 2 vibrates with a frequency of 52 volts.

The test antenna 6 receives a microwave signal, which is fed to the amplifier 7 and the first divider 8, which divides it into four signals, from which narrow-band amplifiers 11-14 separate the signals at frequencies Sho, Wj + iJ, iOo + s and

UQ + W3, At THIS, the gains of the narrowband amplifiers 11-14 are equal to K, SKr, 5Kr and KO, respectively. The signal from the output of the narrowband amplifier 12 is split by divider 9 in the ratio of 1: 2. The first input of the subtractor-19 receives a signal proportional to the logarithm of the signal from the output of the adder 18. The output of the logarithmic amplifier 17 produces a signal proportional to the logarithm of the input signal, which is fed to the second input of the subtraction unit 19.

The output of subtraction unit 22 forms a signal proportional to

173722

the signal arriving from transmitting antenna 2 in the absence of reflections in the anechoic chamber 24. Thus, vibrating the transmitting antenna 2 5 in a plane perpendicular to the direction of the tested antenna 6, with frequency, filtering signals at frequencies me, where is an integer, and restoration of spectra

10 reflected and direct signals make this device more efficient.

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Claims (1)

Invention Formula A device for measuring the radiation pattern of the antenna, containing an anechoic chamber containing a microwave generator connected to the transmitter (antenna to it, a vibration frequency generator, the output of which is connected to two piezoelectric transducers located on the transmitter antenna orthogonal to each other in a plane perpendicular to the direction of the antenna under test, an amplifier connected in series, the input of which is the input for connecting the output of the test antenna: the first power divider and the first narrow-band amplifier, whose tuning frequency is, where is the frequency of the microwave generator, 51ooch is the vibration frequency, the second narrowband amplifier, whose tuning frequency is u) j, and the input of which is connected to the second output of the power splitter, connected in series, the first logarithmic amplifier and the first subtraction unit and the second logarithmic amplifier, according to that, in order to improve measurement accuracy, a third narrow-band amplifier connected in series to the third output of the first power splitter is connected, the tuning frequency of which is s + ISlf, the second power splitter, the second unit Tani and third subtraction unit, a second input coupled to an output of the second narrow-band amplifier, and the output is an output of the apparatus, between the third the output of the first power splitter and the INPUT of the first logarithmic amplifier introduced in series the fourth narrow-band amplifier, the frequency of which 313173724. equal to uj + 35Jg and an adder, to the first narrow-band force-inverse subtraction unit serially connected, the second input of the bodies is connected to a third divider which is connected to the output of the first power, the outputs of which are connected to the subtraction unit, and anti-logarithm- correspondingly with the second input of the sum gky amplifier, and between the output of the automatic processor and the input of the second logarithmic power divider and the second input amplifier, between the output of the second year of the first subtraction unit and the second log rhymic amplification by the input of the second subtraction unit. Compiled by V.Rabinovich Editor A.Revin Tehred M.Hodanich Proofreader G, Reshetnik Order 2418/40 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5   - - - Production and printing company, Uzhgorod, st. Project, 4