RU2298801C1 - Device for measuring the power of a microwave frequency - Google Patents

Abstract

FIELD: the device for measuring the power of a microwave frequency refers to radio measuring technique and may be used in high sensitive devices of the power of a microwave frequency.

SUBSTANCE: the essence of the invention is in that for increasing sensitiveness and accuracy of measuring in a device for measuring the power of a microwave frequency there are introduced in-series connected the first logical element OR the fifth electronic key whose output is connected with the input of the first band-pass filter and the signal input with the output of the first amplifier of low frequencies, in-series connected the second logical element OR and the sixth electronic key whose output is connected with the input of the second band-pass filter and the signal input with the output of the second amplifier of low frequencies. At that the first and the second inputs of the first logical element OR are connected with the first and the third outputs of the shift register correspondingly, and the first and the second inputs of the second logical element OR are connected with the second and the fourth outputs of the shift register correspondingly.

EFFECT: increases sensitiveness and accuracy of measuring.

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Description

The invention relates to a radio engineering and can be used to measure the power of ultra-high frequencies (microwave).

A device is known for measuring small levels of microwave power, described in the book by M.I. Bilko et al. Measuring microwave power. M., Sov. Radio, 1976, p.65, containing a series-connected thermal converter, an electronic switch, a low-frequency amplifier (ULF), a phase detector, a direct current amplifier (DCT), the output of which is the output of the device and a pulse generator, two outputs of which are connected to the electronic control inputs key and phase detector. The disadvantage of this device is the low sensitivity and reduced measurement accuracy at low levels of microwave power.

A microwave power meter is also known, according to patent No. 2235336 G01R 21/04 RU, comprising a series-connected thermal converter, the input of which is the input of the device, the first electronic switch and the first low-frequency amplifier, as well as the first band-pass filter, the first synchronous detector, adder and constant amplifier current, the output of which is the output of the device, the pulse generator, the second, third and fourth electronic keys connected in parallel via the signal input to the first electronic key are connected in series e the second low-frequency amplifier, the direct input of which is connected to the output of the second electronic key, and the inverse input is the output of the fourth electronic key, as well as a second bandpass filter, a second synchronous detector, the output of which is connected to the second input of the adder, and the direct input of the first low-power amplifier frequency is connected to the output of the first electronic key, and the inverse input is connected to the output of the third electronic key, as well as the first frequency divider in two, the second frequency divider in two, connected in series, logical e element And and a shift register, the four outputs of which are connected to the control inputs of the first, second, third and fourth electronic keys, respectively, and the output of the pulse generator is connected to the clock input of the shift register and the input of the first frequency divider by two, the second input of the AND gate is connected to the output the first frequency divider into two, third and fourth band-pass filters, the inputs of which are connected to the first and second outputs of the shift register, and the outputs - with the second inputs of the first and second synchronous detectors respectively.

The disadvantage of this device is the low sensitivity and, as a consequence, the reduced measurement accuracy at low levels of microwave power.

The closest analogue is the device described in patent No. 2235336 G01R 21/04.

To increase the sensitivity and accuracy of the measurement, a microwave power meter is proposed, containing a thermocouple connected in series, the input of which is the input of the device, the first electronic key and the first low-frequency amplifier, as well as the first bandpass filter, the first synchronous detector, adder and DC amplifier, the output of which is device output, pulse generator, second, third and fourth electronic keys connected at the signal input in parallel with the first electronic key, W swarm low-frequency amplifier, the direct input of which is connected to the output of the second electronic key, and the inverse input is connected to the output of the fourth electronic key, as well as the second bandpass filter and the second synchronous detector connected in series, the output of which is connected to the second input of the adder, the direct input of the first amplifier low frequency is connected to the output of the first electronic key, and the inverse input is connected to the output of the third electronic key, as well as the first frequency divider in two, the second hour divider in series there are two, an AND gate, and a shift register, the four outputs of which are connected to the control inputs of the first, second, third, and fourth electronic keys, and the pulse generator output is connected to the clock input of the shift register and the input of the first frequency divider by two, the second input of the logic element And connected to the output of the first frequency divider into two, third and fourth band-pass filters, the inputs of which are connected to the first and second outputs of the shift register, and the outputs are connected to the second inputs of the first and second synchronous detectors, respectively, characterized in that the first logical OR element is inserted in it, the fifth electronic key, the output of which is connected to the input of the first bandpass filter, and the signal input with the output of the first low-frequency amplifier, the second OR logic element and the sixth electronic key are connected in series the output of which is connected to the input of the second band-pass filter, and the signal input to the output of the second low-frequency amplifier, the first and second inputs of the first logic element OR with are connected to the first and third outputs of the shift register, respectively, and the first and second inputs of the second logical element OR are connected to the second and fourth outputs of the shift register, respectively.

The drawing shows a diagram of the device.

It depicts:

1 - thermal converter,

2, 3, 4, 5 - the first, second, third and fourth electronic keys, respectively,

6, 7 - the first and second low-frequency amplifiers, respectively,

8, 9, 10, 11 - the first, second, third and fourth band-pass filters, respectively,

12, 13 - the first and second synchronous detectors, respectively,

14 - adder

15 - UPT,

16 - pulse generator,

17, 18 - the first and second frequency dividers into two, respectively,

19 - a logical element And

20 - shift register

21, 22 - the first and second logical elements OR, respectively,

23, 24 - the fifth and sixth electronic keys, respectively.

The microwave power meter contains: thermal converter 1, first 2, second 3, third 4 and fourth 5 electronic keys, first 6 and second 7 VLF, first 8, second 9, third 10 and fourth 11 band-pass filters, first 12 and second 13 synchronous detectors , adder 14, UPT 15, pulse generator 16, first 17 and second 18 frequency dividers by two, logic element I 19, shift register 20, first 21 and second 22 logical elements OR, fifth 23 and sixth 24 electronic keys.

The microwave power meter works as follows. A low-level constant voltage from the output of the thermal converter 1 is supplied to the signal inputs of the first, second, third, and fourth electronic switches 2, 3, 4, and 5, the control inputs of which receive pulses from the outputs of the shift register 20 shifted between themselves by a quarter of the period. The information input of the shift register 20 receives pulses from a frequency divider into four, formed by series-connected first 18 and second 17 frequency dividers into two and a logical element And 19, and to the clock input - a signal from the output of the pulse generator 16. From the outputs of the first 2 and of the third 4 electronic keys, the signals are fed to the direct and inverse inputs of the first VLF 6, and from the outputs of the second 3 and fourth 5 electronic keys, the signals are sent to the direct and inverse inputs of the second VLF 7, respectively. At the same time, amplified bipolar signals are formed at the outputs of both ULFs.

In the absence of pulses at the outputs of the first VLF 6 and the second VLF 7 interference occurs, which is the intrinsic noise of the first VLF 6 and the second VLF 7, which reduces the sensitivity and accuracy of the microwave power meter. In order to close the gain channels when there are no pulses of the measured signal, from the pulses of the shift register 20 coming from outputs 1 and 3 (for the channel of the first VLF 6) and from outputs 3 and 4 (for the channel of the second VLF 7), using the first 21 and second 22 logical elements OR, strobe pulses are generated that arrive at the control inputs of the fifth 23 and sixth 24 electronic keys, respectively.

Then the signals are fed to the inputs of the first 8 and second 9 bandpass filters, designed to convert the pulse signal into a sinusoidal one and to clear the noise lying outside the band of the useful signal.

After that, the sinusoidal waveforms are converted to direct current in the first 12 and second 13 synchronous detectors and are summed on the adder 14. UPT 15 produces the final amplification of the direct current signal to the level necessary for the operation of the indicator device.

To obtain the reference signals acting on the second inputs of the first 12 and second 13 synchronous detectors, the signals from the first and second outputs of the shift register 20 are used after conversion to a sinusoidal voltage and purification from stray noise by the third 10 and fourth 11 bandpass filters.

Thus, as a result of a decrease in the duration of the interference at the moments when there are no pulses of the measured signal, the interference energy from the outputs of the first VLF 6 and the second VLF 7 decreases. This results in a gain in signal-to-noise ratio and an increase in the sensitivity of the meter.

This will make it possible to increase the sensitivity of the device at the same level of the input microwave signal and significantly increase the measurement accuracy at low microwave power levels.

All elements of the device can be made on a standard element base, and do not have any features.

Claims (1)

A microwave power meter containing a series-connected thermocouple, the input of which is the input of the device, the first electronic switch and the first low-frequency amplifier, as well as the first bandpass filter, the first synchronous detector, the adder and the DC amplifier, the output of which is the output of the device, a pulse generator, the second , the third and fourth electronic keys connected at the signal input in parallel with the first electronic key, a second low-frequency amplifier, the direct input of which is connected to the output the house of the second electronic key, and the inverse input with the output of the fourth electronic key, as well as a second-pass filter and a second synchronous detector connected in series, the output of which is connected to the second input of the adder, the direct input of the first low-frequency amplifier connected to the output of the first electronic key, and inverse input - with the output of the third electronic key, as well as the first frequency divider into two, the second frequency divider into two, the AND gate and the shift register, four outputs connected in series which is connected to the control inputs of the first, second, third and fourth electronic keys, respectively, and the output of the pulse generator is connected to the clock input of the shift register and the input of the first frequency divider by two, the second input of the logic element And is connected to the output of the first frequency divider by two, third and a fourth band-pass filters, the inputs of which are connected to the first and second outputs of the shift register, and the outputs are with the second inputs of the first and second synchronous detectors, respectively, characterized in that a first OR gate, a fifth electronic key, the output of which is connected to the input of the first bandpass filter, and a signal input with the output of the first low-frequency amplifier, series-connected second OR gate and a sixth electronic key, the output of which is connected to the input of the second bandpass filter, and the signal input with the output of the second low-frequency amplifier, the first and second inputs of the first logical element OR connected to the first and third outputs of the shear istra respectively, the first and second inputs of second OR gate connected with the second and fourth outputs of shift register respectively.