SU416628A1 - DEVICE FOR MEASUREMENT OF THE COEFFICIENT OF COMMUNICATION OF RESONATORS - Google Patents

Description

one

The invention relates to a radio metering technique on the microwave and can be used to measure the coupling coefficient of the resonators with the microwave transmission line.

The known devices do not allow a direct reading of the measured value of the coupling coefficient p, which is determined from the measurement results of the VSWR of the resonator tuned to the resonant frequency and rasterized relative to it.

The proposed device, for the purpose of measuring accuracy, is equipped with a manipulator, rebuilding the resonator in accordance with the voltage variation of the modulator, frequency modulating signal of the microwave generator, as well as a selector, one input of which is connected to the modulator, the other to the detector section, connected to the channel of the incident wave of the directional coupler, the output pulses of which are gated on the voltage ratio meter, an indicator is connected to the co-rior, which is calibrated in terms of the coupling coefficient values (5.

The drawing shows a block diagram of the proposed device.

The following notation is taken: microwave generator 1; frequency modulator 2; oscilloscope 3; switch 4; manul tor 5; measurable resonator 6; measuring line 7; detector 8; 9 relative pressure meter; selector 10; detector 11; wave number 12; fixed coupler 13; communication coefficient indicator 14 (3; coupler 15; detector 16.

The device works as follows.

The generator 1 is modulated in frequency by a sawtooth voltage produced by the modulator 2. The same voltage is applied to the l-input of the oscilloscope 3. In addition, the modulator 2 is controlled by the voltage across the switch 4 to the manipulator 5. Last does not reconstruct the resonator 6 under study in such a way that in some periods of modulation voltage of generator 1 (for example, even) the resonator 6 is tuned to the operating frequency, and in other non-odd modes it is completely upset. The microwave signals at the probe output of the measuring line 7 are detected by the detector 8 and the voltage ratio meter 9 is compared by a gated one. The strobe pulses are produced by the selector 10 from the pulses taken from the detector 11 and from the pulses of the manipulator 5.

The signal to wave meter 12 is supplied from generator 1 through directional coupler 13. As indicator 14, the coupling coefficient {-) uses a magnetoelectric microammeter, the reading of which is proportional; 11, the amplitudes of the signals at the probe output of measuring cell 7 are even and odd The generator 1a is calibrated in terms of the coupling coefficient | 3.

To visually observe the resonance characteristics of the resonator G under study and set the frequency of wave meter 12 to its resonant frequency, part of the signal reflected from resonator 6 is transmitted through coupler 15 and detector 16 to the g / input of the oscilloscope 3, and the signal from the output of detector P to 2 input .

To measure the coupling coefficient of the resonator 6, the average frequency of the oscillator 1 is not reconstructed in this way. The resonant frequency of the measured ional resonator 6 is in the automatic frequency tuning band of the oscillator 1. The label of the wavemeter 12 on the screen of the oscilloscope 3 matches the extreme resonance characteristic of the resonator 6. In position a The non-switch 4- resonator 6 is completely upset, and the indications of the indicator 14 are proportional to the amplitude of the signal at the probe output of the measuring line 7. By the maximum indication of indicator 1 4, probe 7 is installed in the antinodes of the line of the line.

Next, switch 4 from avite to position b. At the same time, in the bake periods of modulation of the geierator 1, the input of the voltage ratio meter 9 enters a sigal, pronounced amplitude of the field at the antinode of the line at the disrupted resonator 6, and in the oscillator at resonance. The coupling coefficient (3 is read from the indicator cell 14.

The formula is D D a à a 14. The assumption of a probe located in the zero line at paccTpoii resonator 6, the amplitude of the microwave sigal removed from the probe at the resonant frequency can be written in the following form:

pad + Ref. pad. (1 ih):

where / Gtsad., .GOTJ ..--- amplitudes of the waves incident on the resonator 6 and the waves reflected from it, respectively;

/ - module reflector resonator 6;

the sign “with ()” is one of the cases of weak communication ((), and the sign “--- - with the case of strong communication ().

With a quadratic characteristic of the detector 8, the voltages L-v, L-s at the input of the meter 9 from 11 () are equal to:

6 ,, ,,,. ; and, K (l ± Rr-pad. G,

where L is the proportionality coefficient. According to the statement.

/ f1-y

, R-

1 g

1 - R

V 1 - fi

PRIORITY

A device for measuring the coupling coefficient of a resonator, a cociosinice from a microwave generator, a frequency modulator, a wave meter, a fixed coupler, a measuring line, detector sections, an instrument ratio meter, an oscilloscope, differs in that. that, for the purpose of new measurement accuracy, it is equipped with a manipulator, periodically uninterrupted. its measured resonator and controlled voltage of the single modulator, and a selector, one input of which is connected to the said path modulator, the other - with the detector section, a sub-switch to the channel of the incident wave is directed to the coupler, and the output is connected to the meter with a pair, the indicator of which is calibrated in terms of the coupling coefficient.