SU363043A1 - PHASE SHEET MEASURER FOR IMPOSSIBLE FOUR-POLES - Google Patents

Description

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The invention relates to a microwave measurement technique and can be used to measure the parameters of non-reciprocal quadrupoles.

For nonreciprocal quadrupoles, the most important parameters are phase shifts in the propagation of forward and backward waves Gnp and Colr and nonreciprocal phase shift AG (jnp - Coll.

It is practically important to directly and automatically measure the listed parameters not only at low but also at high power levels.

Devices are known for measuring the parameters of quadrupoles consisting of a microwave generator, a modulator, a double tee power divider, quadrature and antiphase eight-pole networks, subtraction circuits, and an indicator.

However, these devices provide measurement (7pr or Go6p in the waveguide band at a low power level, and for measuring Gnp and Go6p at high power levels (BOOM), it is necessary to cascade the microwave power dividers in the measuring part of the path and re-orient the quadrupole to the transition from Gnp to Go6p measurement. This significantly increases the measurement accuracy. In addition, the possibility of direct measurement is excluded.

The aim of the invention is to provide forward, inverse and non-reciprocal phase shifts at a high power level and an increase in measurement accuracy.

The proposed four-port phase shift meter differs from the known ones in that it uses high-speed instantaneous power meters connected to the quadrature output channels.

(90 °) and antiphase (180 °) hybrid connections of the phase discriminator, a ring circuit with a calibration branch, two switches, switching microwave signals from the outputs of the secondary channels of directional couplers of the ring circuit to the input of the phase discriminator, synchronous detectors and indicators with a zero in the middle.

The use of instantaneous VUM meters, a ring circuit, switches, synchronous detectors and indicators with a zero in the middle of the scale makes it possible to measure both Gnp, Go6p and AG at high power levels in the path of the meter, eliminating the need for reorientation of the quadrupole in

measurement process, improves the accuracy and speed of measurements and provides an unambiguous reading when measuring phase shifts in the range of 0-360 °. The drawing shows a functional diagram with the following designations:

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j - microwave generator BOOM, 2 - modulator, 5 - power divider, 4 - ferrite valves, 5 - directional otvetitel, oriented to the waves, falling on the quadrupole, 6 - directional taps, oriented to the wavelength, through the quadrupole, 7- 10 - high-frequency switches, I - the test non-reciprocal quadruple, 12 - tees, 13 - quadrature (90 °) eight-pole, 14 - anti-phase (180 °) eight-pole, 15-speed-free high-level power meters, 16 - matched loads, P and 18 subtraction circuits, 19 to 20 - synchronous etektory, 21 p 22 - indicators to zero in the middle of the scale.

Consider the operation of the meter when measuring Gnp (switches 10 ii 11 are in positions a and b, respectively).

The signal of the microwave generator 1 is connected through a power divider 3 into an annular circuit formed by elements 4-8 and a quadrupole 11. From the outputs of the secondary channels of the left coupler 5 and the right coupler 6, the microwave signals containing information about Gnp are fed through the high-frequency switches 9 and 10 to the inputs tees 12, then to the input channels of quadrature 13 and out-of-phase 14 octopowers, from the outputs of which are fed to instantaneous power meters 15, loaded on matched loads 16.

Video signals from the outputs of the power meters 15 are fed to the subtraction circuits 17 and 18. The output signals of these circuits, which are proportional to Sin Gnp and Cos, respectively, are panoramic characteristics of Gnp (as well as when the characteristics of the GOOP and AG are reproduced) and are transmitted to the horizontal and vertical CRT plates.

For a more accurate reading of the Gnp values at any of the frequencies in the operating range, the signals from the outputs of the subtractors 17, 18 are fed to synchronous detectors 19 and 20, to which the signal from the modulator 2 is also supplied as a reference signal.

The constant voltages from the detector outputs are fed to the indicators 21–22 s. zero in the middle of the scale, and one of them, for example 21, serves to read the measured phase shift, and the other, for example 22, to avoid counting ambiguity when measuring Gnp ° To measure the Go6p switches 9 and 10

transferred to positions a and b, the inputs of the tees 12 receive microwave signals from the outputs of the left coupler 6 and the right coupler 5. The work of the rest of the meter is similar to the case of measuring Gnp.

When measuring AG, switches 9 and 10 are set to position a and b. In this case, the inputs of the tees 12 are supplied with signals from the outputs of the couplers 6, thereby providing direct measurement

AG.

Thus, the proposed meter provides direct measurement of Gnp, Go6p and AG non-reusable quadrupole at a high power level without dismantling

path and reorientation of the quadrupole, and also improves the accuracy of measurements with a unique reading of phase shifts in the range of 0-360 °.

Subject invention

A phase shift meter for nonreciprocal quadrupoles, comprising a generator,

a modulator, a power divider, two tees, a quadrature and an opposite phase eight-pole network, subtraction circuits and an indicator, characterized in that, in order to ensure direct, reverse, and non-reciprocal phase shifts at a high power level and an increase in measurement accuracy, the inputs of the tees are connected via high-frequency non-switches to the outputs of the secondary channels of two pairs of counter-switched directional taps, with the outputs of each pair of taps being connected via high-frequency switches pevzaimnogo terminals of the quadripole, the inputs of each pair are connected through couplers

valves with a power divider, and to the outputs of the quadrature and antiphase eight-terminal networks, high-speed instantaneous power meters connected via subtraction and synchronous circuits are connected

detectors with dial gauges with a bullet in the middle of the scale.