SU1183916A1 - Super high frequency phasemeter - Google Patents

Description

The invention relates to measuring equipment, and more specifically to devices for measuring the phase of microwave signals passing through a medium with rapidly changing amplitude and phase characteristics.

The purpose of the invention is to increase the speed and simplify the design of the phase meter.

Improving the speed of the proposed device and its simplification is ensured by the fact that instead of amplitude modulation of the microwave signal in the measuring channel using a ferrite modulator, phase shift keying of the microwave signal in the reference channel is used, which is provided by means of the phase shifting section and two to three orders of magnitude speed above. In addition, the use of phase manipulation allows you to use more simple than phase A new discriminator is a signal comparison device (mixer), which consists of only one power divider and one detector section.

FIG. 1 shows a block diagram of the device; in fig. 2 time diagrams of his work.

The ultra high frequency phase meter contains a microwave generator 1 connected in series, a first power divider 2 and a first valve 3, an attenuator 4 connected in series, a matching unit 5, a test object 6 and a second valve 7 connected in series with an exemplary phase shifter 8 whose input is connected to the second output of the first divider 2 power, and the third valve 9, the generator 10 reference voltage, the second power divider 11 and the first manipulator 12, connected in series to the third power divider 13, the mixer 14, the amplifier 15 with a -automatic gain control, the synchronous detector 16 and the unit 17 records, with the input of the second divider 11 output is connected to the output of the third valve 9, the second input of the first arm 12 is connected to the first output of generator 10 reference voltages and a second input of synchronous detector 16, - a second vyho1183916 2

home of the generator 10 reference voltages, sequentially connecting the second manipulator 18 and the phase-shifting section 19 ,. the first input of the second manipulator 18 is connected to the second output of the second power divider 11, and the second input to the third output of the reference voltage generator 10, the phase shifting output of section 19 is connected to the second input of the third power divider 13.

The operation of the phase meter is carried out as follows.

The ultra high frequency generator 1 generates an unmodulated microwave signal, which is separated by

Divide 2 power divider into two channels. In the measuring channel, the microwave signal passes through the first valve 3, the attenuator 4, the matching unit 5, the test object 6 with rapidly changing amplitude and phase characteristics, the second valve 7 and goes to the second input of the mixer 14 (Fig. 2e). In the reference channel, the microwave signal passes through an exemplary phase shifter 8, which is designed for the initial phase reading before measurements, the third valve 9 and is divided in half using the second power divider 11. A part of the microwave signal passes through the first manipulator 12, which blocks this channel by half the switching period (Fig. 2 α, I), synchronously with the pulses coming from the reference voltage generator. At this time 40, another part of the microwave signal passes through the second manipulator 18, which overlaps the second arm in the other half of the switching period, and then this part of the microwave signal is shifted by the phase-shifting section 19 by 180 ° compared to the signal in the first arm (FIG. 2 8, d). Microwave signals from the first and second shoulders sequentially pass through 50 the third power divider 13 and arrive at the first input of the mixer 14 (Fig. 2 a). The mixer consists of a double ⁰ waveguide tee and the detector section, the output is removed ko55 Torah pulse voltage whose amplitude is proportional to the phase difference between the reference and measuring channels (FIG. 2g, *).

3 1

The pulse signal is fed through the amplifier 15 with automatic gain control to the input of the synchronous detector 16, the second input of which receives the synchronizing signal from the second output of the gene. Rattor 10 reference voltages. From the output of the synchronous detector 16 to the input of the recording unit 17, a DC signal is given ^ whose amplitude is proportional to the difference

phase measurement channel and the reference ^: channel, and the sign of this voltage shows the sign of the phase change.

In the proposed microwave phase meter, the speed is increased and the design is simplified due to the fact that 16 is used.

The basic manipulation of the microwave signal, which is achieved by introducing the anti-phase manipulators and phase-shifting sections into the reference dividing signal of the microwave signal, as well as using an simulator, an amplifier with automatic gain control and a synchronous detector. Application of microwave phase shift keying

10 signals allow for using. of two-direction ferrite switch-type manipulators, which have a switching frequency of up to 10 MHz, obtain an increase in device speed

by 2-3 orders of magnitude. Phase manipulation of the microwave signal allows you to simplify the extraction, division and processing of the useful signal.

1

1183916

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FIG. 2

Composed by V.Shubin

Claims (1)

ULTRA-HIGH-FREQUENCY PHASOMETER, containing in series · connected microwave generator, first power divider and first valve, connected in series to atta ^! nuator, matching unit, the output of which is connected to the input of the second valve through the terminals for connecting the object under study, an exemplary phase shifter connected in series, the input of which is connected to the second output of the first power divider, the third valve, the reference voltage generator, characterized in that speed and simplification of the design, the second power divider, the first manipulator, the third power divider, the mixer, the amplifier with automatic adjustment are introduced in series with it oh gain, synchronous detector and recording unit, the second power divider input is connected to the third valve output, the second input of the first manipulator is connected to the first output of the reference voltage generator, and the second input of the synchronous detector is connected to the second output of the reference voltage generator, and phase-shifting section, with the first input of the second manipulator connected to the second output of the second power divider, and the second input - to the third output of the reference voltage generator, output One phase-shifting section is connected to the second input of the third power divider, and the output of the second valve is connected to the second input of the mixer. § X X about f one