SU1688192A1 - Program analizer of microwave cirquits - Google Patents

Description

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(21) C681637 / 09 (2 /) 07.03.89) 30.1P.91. Vul. № 0

(71) Minsk Radio Engineering Institute

(72) A.C. Elizarov, V.B. Gaiduk and I.E. Grishukevich

(53) 621.317. (088.8)

(56) USSR author's certificate No. 1282023, cl. G 01 R 27/32, 1983.

USSR author's certificate If 136T492, CL. G 01 R 27/32, 1985. (514) PANORAMIC ANALYZER OF MICROWAVE CHAINS

(57) FIELD: engineering.

measurement of S-parameters of quadrupoles microwave. The purpose of the invention is to improve the accuracy of measurement of the arguments of S-parameters. The analyzer contains a oscillating frequency generator 1, a tee 2, a microwave circuit 3 under study, a mixer A, amplifiers 5 and 6, a ratio meter 7, discrete phase shifters 8-10, synchronous detectors 11-1, a quadrant indicator 15, module allocation modules 16-19 , comparator 2C, adder 21, switch 22 and indicator 23. The goal is achieved by introducing indicator 15 and comparator 20. 2 Il.

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This invention relates to a technique for measuring S-parameters of microwave quadrupoles.

The purpose of the invention is to improve the accuracy of measurement of the arguments of S-parameters.

Figure 1 shows the structural electrical circuit diagram of a panoramic microwave circuit analyzer; 2 shows output voltage plots.

The panoramic analyzer of the microwave circuits contains a generator 1 - the oscillating frequency, a tee 2, t the studied tuner 3, a mixer h, the first and second amplifiers 5 and 6, the ratio meter 7, the first, second and third discrete phase shifters 8, 9 and 10, the first, second, third and fourth synchronous detectors 11-1 A, quadrant indicator 15, first, second, third and fourth module allocation modules 16-19, comparator 20, adder 21, switch 22 and indicator 23.

Panoramic analyzer microwave circuits works as follows.

At the output of mixer 4, two signals are generated — the measuring, passed through the microwave circuit 3 under study and carrying information about the module and the argument of the measured parameter Jsul,, and

,,

ny. and about. After amplification in the first and second amplifiers 5 and 6, both signals through the meter 7, form at its output a voltage proportional to Uu / U which falls on the information inputs of the synchronous detectors. The reference signal passes directly to the reference input of the first synchronous detector 11 directly from the output of the first amplifier 5, and to the reference inputs of subsequent synchronous detectors, the reference signals come from the outputs of the corresponding discrete phase shifters 8-10 and are thus shifted relative to the first reference signal by 45 °, 90 ° and 135 °. At the output of the synchronous detectors 11th, a signal is formed (see Fig. 2), proportional to

V

Uuco8 Uucos (lpu + 5); Uucos (-)

v ° s (

After passing the corresponding blocks 16-19, the positive half-hems are added up in the adder 21 and

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l j5 20

25

thirty

35

40

45

55

through switch 22 is fed to indicator 23. As a result, a signal proportional to the module of the measured parameter is obtained at the input of the indicator 23, independent of the electrical length of the microwave circuit 3. At the output of any of the four synchronous detectors there is information about the argument of the measured parameter Sri. However, using this information to display on indicator 23, for example, is impractical due to large errors or long processing time.

However, as can be seen from FIG. 2, only linear sections of the output signals of blocks 16-19 can be used, which significantly reduces the error. If a signal from the output of the first block 16 (id) is fed to one input of the comparator 20 and to the second from the third block 18 (Ue) output, then the output signal (Up consists only of linear sections. The 2U comparator has the following algorithm:

If id 6 Ua, then UF b d;

If and, UF, then UF 1,4UMelee-Ue The disadvantage is that there is no information about the quadrant of the argument of the parameter being measured, however, it must be determined from the output signals of the first and third synchronous detectors 11 and 13

UFblx1vt J first quadrant; when i / y and 0 the argument is enclosed in

UBb | x, C second quadrant; when the argument is concluded

1 ohche O in the third quadrant; at willow the argument lies in b out1) 0 in the fourth quadrant.

Indicator 15 in the simplest case may represent two LEDs that respond to positive values of the signal.

Thus, the indicator 23 displays information about the module of the measured parameter and its argument, which enters alternately through the switch 2. And the quadrant of the measured argument is indicated by the indicator 15,

Claims (1)

Invention Formula A panoramic analyzer of microwave circuits containing a series-connected oscillating frequency generator, 516 tee, mixer, first amplifier, ratio meter, first synchronous detector, first module allocation unit, adder, switch and indicator; the output of the first amplifier is connected to the reference input of the first synchronous detector and connected to serially connected first, second and third discrete phase shifters, the output is measured by the ratios connected to the inputs of the second, third, and fourth synchronous detectors, the outputs of which are respectively through the second, third, and fourth blocks of the allocation module s to the second, third and fourth inputs of the adder, and the reference inputs connected respectively to the outputs of the first, second and third discrete phase shifters, the second output smeU 6tin C A UfaxCM VfuxCW 0 /% / M / 4 U u8ykhYY USwbBNIB I8yadvN17 ikhVSh8 M8ihVN19 % l / 2 926 The caliper through the second amplifier is connected to the second input of the ratio meter, the second output of the tee and the second signal input of the mixer are respectively the output and the input for switching on the microwave circuit under study, the second output of the oscillator frequency generator is connected to the heterodyne input of the mixer, with the control input of the indicator, which is characterized by the fact that, in order to improve the accuracy of measurement of the arguments of the S-parameters, a quadrant indicator has been introduced, the outputs of which are connected to the outputs of the first and third synchronous parts vectors, and a comparator, the inputs of which are connected to the outputs of the first and third allocation units of the module, and the output - to the second input of the switch. Have