SU1640657A1 - Microwave amplitude and phase meter - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to simplify the design. Amplification meter contains 1 microwave signals generator, directional coupler 2, 90 ° discrete phase shifter. 3, the amplitude modulator 4, the detector section 5, the selective amplification and synchronous detection unit 6, the control and computing unit 7, the low-frequency generator 8 and the object under study 9. At the same time, the unit 6 selects the components from the section 5 signal at the modulation frequency and its synchronous detection. The amplitude and phase are measured at each contact of the object 9 by successively taking samples of the magnitude of the signal from block 6 in two states of the phase shifter 3 differing in the phase shift introduced by 90 °. Unit 7 issues commands to switch the phase shifter 3. enters the signal samples from block 6 and calculates the amplitude and phase from them. 1 il. (I

Description

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The invention relates to microwave technology, in particular, to the technique of antenna measurements.

The aim of the invention is to simplify the design.

The drawing shows the structures - on the diagram of the microwave amphifter meter.

The FH ample-phase meter contains a microwave signal generator 1, a directional coupler 2, a discrete phase shifter 3 at a 90 ° amplitude modulator 4, a detector section 5, a selective amplification and synchronous detection unit 6, a control and calculation unit 7, a low-frequency generator 8 and the object 9 under investigation.

Amplification microwave works as follows.

The microwave sinusoidal signal from the generator 1 output of the microwave signals is fed to the input 10 of the directional coupler 2, and from its straight arm 11 via the discrete phase shifter 3 by 90 and the modulator 4 to the input of the object 9. The signal arriving at it is modulated by the amplitude of the meander with the frequency fw generated by the low-frequency generator 8. The signal from the output of the object 9 is fed to the expanded arm 12, and to the associated arm 13 of the directional coupler 2 and further to the detector section 5, to which due to the connection between shoulders 10 and 13, the directional coupler 2 is transmitted as a reference signal to the power share of the unmodulated oscillations from the output of the microwave signal generator 1. The selective amplification and synchronous detection unit 6 selects the component at the modulation frequency fM from the output signal of the detector section 5

synchronous detection.

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Measurement of amplitude and phase at each state of the object under study 9 is performed by successively taking samples of the magnitude of the signal at the output of the selective amplification unit 6 and synchronous detection in two states of the discrete phase shifter 3 by 90 °, differing in the introduced phase shift by 90 °. The control and computing unit 7 commands the discrete phase shifter 3 to switch to 90 °, enters the signal samples from the output of the selective gain unit 6 and synchronous detection

and calculates the amplitude and frequency from them.

Provided that the amplitude A of the reference signal significantly exceeds the amplitude g of the measured signal, the samples and ,, and U (in the first and second states of the discrete phase shifter 3 by 90 °) are

Uj kAasinCf;

U kAacostf,

where k is the proportionality coefficient.

Relative amplitude and phase are equal

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Cf C, + Itsignq (signU, - 0/2, 0 rfleq t arctg (U, / U).

Under the condition of A / a 32 (30 dB), the specified formulas ensure accuracy no worse than ± 0.15 dB in amplitude and ± 1.3 ° in fate.

The proposed microwave amplifiers are much simpler than the known ones, its use reduces the cost and dimensions of the microwave part of the device without degrading its electrical characteristics, according to the formula of the invention

Amplification microwave, containing a generator of microwave signals, the output of which is connected to the input shoulder directional

5 of the coupler, a module module, whose control input is connected to the first output of the low-frequency generator, and the output is intended to connect the input of the object under study, a discrete phase shifter to 90 °, and also

connected in series to a detector section, a selective amplification and synchronous detection unit, the control of which input is connected to

5 with a second output of the low frequency generator, and a control and calculation unit, the output of which is connected to the control input of the discrete phase shifter by 90 °, characterized in that.

1 that, in order to simplify the design, the 90 ° discrete phase shifter is connected between the straight arm of the directional coupler and the modulator input, the coupled arm of the directional coupler is connected to the input of the detector section, and the diverted shoulder of the directional coupler is intended to connect the output of the detector under study. object.

Claims (1)

Claim A microwave ampliphase meter containing a microwave signal generator, the output of which is connected to the directional input arm, coupler, modulator, control input which is connected to the first output of the low-frequency generator, and the output is designed to connect the input of the object under study, a discrete phase shifter. To 90 °, and a series-connected detector section, a selective amplification and synchronous detection unit, the control input of which is connected to the second output of the low-frequency generator, and a control and calculation unit, the output of which is connected to the control input of the discrete phase shifter by 90 °, characterized in that, in order to simplify the design, a discrete phase shifter by 90 ° is connected between the direct arm of the directional coupler and the modulator input, the connected arm of the directional coupler is connected to the input of the detector section, and the untied arm directional coupler is designed to connect the output of the investigated object.