SU1478152A1 - Device for measuring modulus and phase of reflection coefficients in microwave channels - Google Patents

Abstract

This invention relates to microwave measurement technology. The purpose of the invention is to expand the operating frequency range. The microwave generator 1 and the load 4 create a standing wave in the measuring line 2. The signals from the outputs of the sensors 3, proportional to the squares of the standing wave voltages at their locations, through the software-controlled switch 5 enters the ADC 6. After that they are processed in block 7 processing and software management. The processing algorithm is based on solving the system of obtained controls by the method of least squares. Information input / output unit 8 generates commands for starting work, retrieving information from sensors 3, and outputting a set of load parameters 4 (module and phase of reflection coefficient). The use of eight sensors 3 and the choice of the corresponding distances between them allow the working frequency range to be extended to 5 octaves. 2 Il.

Description

The invention relates to microwave measurement technology and can be used to measure the complex reflection coefficient in microwave tracks and in the electronics industry to automate the process of measuring the modulus and phase of the reflection coefficient of the microwave load.

The purpose of the invention is to expand the operating frequency range.

FIG. Figure 1 shows an electrical block diagram of a device for measuring and the phase of the reflection coefficient in the microwave paths; in fig. 2 - the functions F (fl, 1 :, N), which characterizes the non-optimal position of the sensors, as well as the working frequency band for a given number of sensors N and the distance between the sensors If.

The device contains a microwave generator 1, the measuring line 2, along which the sensors 3 are located, the load 4 is connected to the output of the measuring line 2. The outputs of the sensors 3 are through a program-controlled switch

5 and analog-to-digital converter

6 are connected to the processing and software control unit 7, the control output of which is connected to the control input of the program-controlled switch 5. The information input / output unit 8 is connected to the processing unit 7

and software control. Eight sensors 3 are placed along the measuring line 2 at a distance x 0.83fl; 0, 1.01; 1, W; 1.22 L; 1.34V, 1, 487i relative to each other, where is the minimum wavelength of the operating frequency range in the measuring line.

The outputs of the sensors 3 are connected via a program-controlled switch 5 and an analog-digital converter 6 to a processing and software control unit 7, the control output of which is connected to a control input of a software-controlled switch 5. Information input and output unit 8 is connected with block 7 processing and software control.

A device for measuring the modulus and phase of the reflection coefficient in the microwave paths operates as follows.

The microwave generator 1 and the load 4 create a standing wave in the measuring line 2. The signals from the outputs of the sensors 3, proportional to the squares of the standing wave voltages at their locations, pass through the software-controlled switch 5 to the analog-to-digital converter 6, after which they are processed in processing and program control unit 7. The processing algorithm is based on solving the system of obtained controls by the method of least squares.

Information input / output unit 8 generates commands for starting work, retrieving information from sensors 3, and outputting a set of load parameters 4 (module and phase of reflection coefficient).

The device allows you to extend the operating frequency range when using eight sensors to five octaves. This is achieved due to the proposed arrangement of sensors 3. There is an optimal arrangement of sensors for a fixed frequency, which is the minimum matrix determinant (ZZ) (ZZ) TJ of measurement errors of the standing wave amplitude, modulus, and phase of the reflection coefficient of the load (G) - calculated vector parameter values; Z (P, q, G) is the vector of their true values; P is the square of the amplitude of the voltage of the sensors; G, (j is the modulus and Phase of the reflection coefficient of the load; ЕЈ ... is the expectation operator proportional to the square of the measurement error ellipsoid volume, and is the D-optimal experiment plan in the least squares method. The determinant of the matrix R in this case is K / K / OPT. Using this value, you can build a function

FM i. N) .2.

(N) / 4nr The function F (fl, 1;, N) characterizes the non-optimal arrangement of the sensors for the wavelength range of ft for a given number of sensors N, and the operating frequency range increases to five octaves.

Claims (1)

Invention Formula i A device for measuring the modulus and phase of the reflection coefficient in the microwave paths, comprising a microwave generator, the output of which is connected to the measuring line, along which the sensors are located, the output of the measuring line is intended to connect the load, and an analogue a digital converter, a processing and software control unit, and an information I / O unit, while the control output of the processing and software control block is connected to the control the input of the software-controlled switch, I distinguish Right now, in order to expand the working frequency range, the number of sensors is chosen equal to eight, and the distances between them are chosen to be 0, 0.92 fl; l, 01flj 1, W; l, 22fl; 1.34ft; 1,4 ft, respectively, where ft is the minimum wavelength of the working frequency range in the measuring line. {РЬ.Ц,)} YuOO yoRoBoZ diozone 816 figure 1 7g ff4 w