SU1645913A1 - Device for measuring vswr of two-port - Google Patents

Description

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(21) 4629192/09 (22) 12.30.88 (46) 04.30.91 Bull. M- 16 (72) E.P. Krugov (53) 621.317.041 (0888)

(56) KSVN panoramic meter P2-65. Technical description and operating instructions.

Kukush V.D. Electroradio measurements M .: Radio and communication, 1985, p. 332-334. (54) DEVICE FOR MEASURING THE FOURTH-CLOUD VSWR

(57) The invention relates to a technique for measuring the parameters of microwave paths. The purpose of the invention is to improve the measurement accuracy of the VSWR of a quadrupole loaded on an arbitrary unmatched load 19. The device contains r-1 oscillating frequency, switches 2, 7, 14 and 15, microwave path 3, directional couplers 4, 5 and b of the incident and reflected waves , detector sections 8 and 13, meter 9 relationships,

adder 10, attenuator 11, phase shifter 12, oscillographic indicator 16, r-17 sawtooth voltage, quadripole under study 18. Load 19 is connected to the measuring path to measure the VSWR. The output of the adder 10 compensates for the signal reflected from the load 19. T . K. In the signal coming from the output of the directional coupler 5, besides the signal reflected from the load 19, there is a signal reflected from the input of the quadrupole 18, then the output proportional to the level the signal reflected from the quadrupole 18. This signal after detection is fed to the meter 9 and the indicator 16. Thus, a measurement of the VSWR of the quadrupole 18 is provided with the exception of the effect of the load 19 on which it is loaded, by compensating for the signal reflected from this load. 1 il.

with

WITH

The invention relates to the field of measuring the parameters of microwave paths and devices and can be used to measure the VSWR of pass-through microwave quadrupoles loaded on an unmatched load with an unknown VSWR.

The purpose of the invention is to improve the measurement accuracy of the VSWR of a quadrupole loaded on an arbitrary inconsistent load.

The drawing shows a block diagram of a device for measuring the VSWR of a quadrupole.

It contains the oscillating frequency generator 1, the first switch 2, the microwave path 3, the directional coupler 4 of the incident wave, the first and second directional couplers 5, 6 of the reflected wave, the second switch 7, the first detector section 8, the ratio meter 9, the adder 10, the attenuator 11, the phase shifter 12, the second detector section 13, the third and fourth switches 14, 15, the oscillographic indicator 16, the generator 1 / sawtooth voltage, the quadripole 18 under study, and an arbitrary unmatched load 19.

ABOUT

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A device for measuring a four-pole VSWR operates as follows.

Before starting the measurements, calibration is performed using the reflected wave. To do this, between the first and second directional branches 5 and b include the quadrupole 18 under study, switches 2,7,14 and 15 are set to the second position, and a matched load is connected to the input of the directional coupler 4 (not shown). In this case, the generator 1 is connected via the microwave path 3 to the output of the primary channel of the second directional response of the plug 6. The signal of the generator 1 is divided by the second directional coupler in accordance with the ratio of the transmission coefficients of the primary and secondary channels, for example, in half. The first part of the signal goes to the output of the secondary channel of the first directional coupler 0 and then to the second input of the adder 10. The second part of the signal through the attenuator 11 and the phase shifter 12 is fed to the first input of the adder 10. It adjusts the amplitude and phase of the second part of the signal using the attenuator 11 and the phase shifter 12 , achieve zero readings of the oscillographic indicator 16. Equality of the electrical lengths of the paths from the output of the secondary channel of the second directional coupler 6 to the first input of the adder 10 and from the output of the secondary channel a first directional coupler 5 to the second input of the adder 10 allows to provide antiphase input signals of the adder 10 in the frequency range,

To measure the VSWR, the switches 2, 7, 14, 15 are set to the first position. In this case, an arbitrary unmatched load 19 is connected to the measuring path. The signal reflected from it propagates in the same way as the signal from generator 1 during calibration, therefore the output of the adder 10 compensates for the signal reflected from an arbitrary inconsistent load 19. But since the signal arrives from the output of the first directional answer 5. except for the signal reflected from an arbitrary inconsistent load 19, there is a signal reflected from the input of the studied quadrupole 18, then the output of the sum The signal 10 will be allocated proportional to the level of the signal reflected from the quadrupole under study 18. This signal after detection goes to the meter 9 and the oscillographic indicator 16. Thus, the SWR of the quadrupole is measured with the exception of the load on which it is loaded, due to compensation signal reflected from this load.

Claims (1)

Invention Formula A device for measuring a four-pole VSWR, comprising a sweeping frequency generator, a cascade-connected directional incident wave coupler and a first directional reflected wave coupler, a ratio meter, the first input of which through the first detector section is connected to the output of the secondary channel of the incident directional coupler, the second detector section, the load and a sawtooth generator whose output is connected to the input of the oscillating frequency generator frequency control and the oscillation indicator sweep input, the output of the primary channel of the first directional coupler of the reflected wave It is designed to connect the input of a quadrupole under study, characterized in that, in order to improve the measurement accuracy of the two-pole VSWR, loaded on an arbitrary inconsistent load, the microwave path and the first and second switches are entered, the output of the oscillating frequency generator is connected to the input of the first switch one of the outputs of which is through the microwave path connected to the first output of the second switch, and the second output is connected to the input of the primary channel of the directional coupler of the incident wave, the output of the primary channel of the inputted second directional coupler of the reflected wave is connected to the input of the second switch, and the output of the secondary channel through the serially connected attenuator and phase shifter is connected to the first input the entered adder, the output of the secondary channel of the first directional coupler of the reflected wave is connected to the second input of the adder, the output d adder via a second detecting section connected to the input of the entered third switch, one of the outputs of which is connected to the first output of the entered fourth switch, and the second output to the second input of the relationship meter, the output of the relationship meter connected to the second output of the fourth switch, the input of which is connected to the signal input of the oscillographic indicator, and the second the output of the second switch is connected to an arbitrary inconsistent load, and the input of the primary channel of the second directional coupler of the reflected wave is designed for CONNECTIONS Output investigated quadrupole.