CN210037984U

CN210037984U - Multifunctional microwave measurement experimental device

Info

Publication number: CN210037984U
Application number: CN201920402970.2U
Authority: CN
Inventors: 郑源明; 曹正东
Original assignee: Shanghai Fudan Tianxin Science & Educational Instrument Co Ltd
Current assignee: Shanghai Fudan Tianxin Science & Educational Instrument Co Ltd
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-02-07
Anticipated expiration: 2029-03-28

Abstract

The utility model belongs to the technical field of the physics experiment device, specifically be a multi-functional microwave measurement experimental apparatus. The device comprises a microwave signal source, a waveguide coaxial converter, an E-H surface tuner, a directional coupler, an H surface bent waveguide, a microwave frequency meter, a crystal detector, a variable attenuator, a microwave measuring line, a first frequency-selecting amplifier and a second frequency-selecting amplifier; the microwave signal source, the waveguide coaxial converter and the E-H plane tuner are sequentially connected and then connected with the input end of the directional coupler, and the output end of the directional coupler is sequentially connected with the variable attenuator, the microwave measuring line and the first frequency-selective amplifier; the coupling end of the directional coupler is sequentially connected with the microwave frequency meter, the crystal detector and the second frequency-selecting amplifier through the H-face bent waveguide. The end of the microwave measuring line can be configured to replace a plurality of elements, including a power probe and power indicator, a matching load and a short-circuit board. The device of the utility model has the advantages of clear structure, easy operation and high experimental efficiency.

Description

Multifunctional microwave measurement experimental device

Technical Field

The utility model belongs to the technical field of the physics experiment device, concretely relates to multi-functional microwave measurement experimental apparatus.

Background

The microwave has the characteristics of short wavelength, high frequency, linear propagation, quantum property and the like. The available frequency band of the microwave is very wide, the information capacity is large, and the microwave can pass through the ionosphere smoothly, and the microwave is used as an observation means and makes an important contribution to the scientific development. Therefore, the microwave technology is a unique scientific technology, and the basic knowledge and experimental method thereof should be mastered. Due to the characteristics of microwaves, the concept and method of processing problems in the microwave band are quite different from those of low frequency circuits. The study of microwave circuits must take into account the spatial distribution of the electromagnetic field in the circuit and the propagation of the electromagnetic wave. The method is to solve Maxwell equations meeting certain boundary conditions. That is to say, the concept of "electric field" is transferred from "electric circuit" to "electromagnetic field" for research and analysis. The concept of voltage, current and resistance, which are often measured in low-frequency circuits, has lost its original definition of certainty and the field strengths E and H must be used as basic physical quantities, i.e. power, standing waves, frequency and characteristic impedance. Therefore, designing an experimental device capable of measuring these basic quantities is also of great significance in teaching.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a simple multifunctional microwave measurement experimental device. The device can realize the test quantity of a plurality of basic physical quantities in the microwave circuit, and has high measurement efficiency.

The technical scheme of the utility model specifically introduces as follows.

A multifunctional microwave measurement experimental device comprises a microwave signal source, a waveguide coaxial converter, an E-H plane tuner, a directional coupler, an H plane curved waveguide, a microwave frequency meter, a crystal detector, a variable attenuator, a microwave measurement line, a first frequency-selecting amplifier and a second frequency-selecting amplifier; the microwave signal source, the waveguide coaxial converter and the E-H plane tuner are sequentially connected and then connected with the input end of the directional coupler, and the output end of the directional coupler is sequentially connected with the variable attenuator, the microwave measuring line and the first frequency-selective amplifier; the coupling end of the directional coupler is sequentially connected with the microwave frequency meter, the crystal detector and the second frequency-selecting amplifier through the H-face bent waveguide.

The utility model discloses in, still include the short circuit board, the end-to-end connection of short circuit board and microwave measuring line.

The utility model discloses in, the short circuit board is replaced mutually with power probe or matched load, and power probe or matched load are direct and the end-to-end connection of microwave survey line.

The utility model discloses in, still include power probe and power indicator, the end of microwave measuring line links to each other with power probe, power indicator in proper order.

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses the device structure is clear, and easily operation can realize the accurate measurement of multi-parameter among the microwave circuit, and the experimental efficiency is high.

Drawings

Fig. 1 is a schematic view of the structure of the device of the present invention.

Reference numbers in the figures: 1 is a microwave signal source; 2 is a waveguide coaxial converter; 3 is an E-H face tuner; 4 is a directional coupler; 5 is H-face curved waveguide; 6 is a microwave frequency meter; 7 is a crystal detector; 8 is a first frequency selective amplifier; 9 is a variable attenuator; 10 is a microwave measuring line; 11 is a power probe; 12 is a power indicator; 13 is matched load; 14 is a short circuit board; and 15 is a second frequency selective amplifier.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1, the utility model provides a multi-functional microwave measurement experimental apparatus, include: the microwave frequency measuring device comprises a microwave signal source 1, a waveguide coaxial converter 2, an E-H plane tuner 3, a directional coupler 4, an H plane bent waveguide 5, a microwave frequency meter 6, a crystal detector 7, a variable attenuator 9, a microwave measuring line 10, a first frequency-selecting amplifier 8, a power probe 11, a power indicator 12, a matched load 13, a short-circuit board 14 and a second frequency-selecting amplifier 15. The microwave signal source 1, the waveguide coaxial converter 2 and the E-H plane tuner 3 are sequentially connected and then connected with the input end of the directional coupler 4, and the output end of the directional coupler 4 is sequentially connected with the variable attenuator 9, the microwave measuring line 10 and the first frequency-selective amplifier 8; the coupling end of the directional coupler 4 is connected with a microwave frequency meter 6, a crystal detector 7 and a second frequency-selecting amplifier 8 in sequence through an H-face bent waveguide 5. Wherein:

the microwave signal source 1 is used for outputting microwave frequency band signals;

the waveguide coaxial converter 2 is used for converting the signal output by the microwave signal source into the microwave in the waveguide;

an E-H face tuner 3 for adjusting and changing reactance and susceptance in the waveguide;

a directional coupler 4 for coupling a portion of the microwave energy of the primary waveguide into the secondary waveguide;

the H-shaped curved waveguide 5 is used for changing the axis of the wide side of the waveguide;

a microwave frequency meter 6 for measuring a frequency indicative of a microwave;

the crystal detector 7 is used for reflecting the microwave power by the induction voltage; the variable attenuator 9 is used for attenuating the microwave energy in the waveguide;

a microwave measuring line 10 including a crystal detector built therein for measuring a distribution state of a resultant electric field in the waveguide along an axial direction;

the first frequency-selective amplifier 8 and the second frequency-selective amplifier 15 are used for linearly amplifying and indicating detection currents of the crystal detector and the crystal detector 7 in the microwave measuring line 10 respectively;

a power probe 11 for converting microwave power into an electrical signal;

a power indicator 12 for indicating the magnitude of the electrical signal of the power probe 11;

a matched load 13 for canceling microwave energy at the end of the waveguide;

and a short-circuiting plate 14 for reflecting the microwave energy at the end of the waveguide.

Utilize the utility model discloses a when the device carries out microwave frequency's measurement experiment, microwave signal source 1 output microwave frequency section signal, through the microwave that waveguide coaxial converter 2 converted into propagated in the waveguide, reactance and susceptance in the microwave cavity are adjusted to E-H face tuner 3, combine microwave measuring line 10 and rather than the first frequency-selecting amplifier 8 that is connected, enable reactance and susceptance in the whole microwave cavity and reach the matched state. After the microwave passes through the directional coupler 4, part of the microwave energy of the main waveguide is coupled into the secondary waveguide. The microwave output from the coupling end of the directional coupler 4 reaches the crystal detector 7 through the microwave frequency meter 6, the intensity of the microwave is indicated by the second frequency-selecting amplifier 15 connected with the crystal detector 7, and when the cavity resonant frequency of the microwave frequency meter 6 is adjusted to be consistent with the frequency of the measured microwave, the microwave intensity indicated by the second frequency-selecting amplifier 15 is seen to drop obviously.

When the measurement experiment of the waveguide wavelength and the calibration experiment of the crystal detector are carried out, the short-circuit board 14 is configured at the tail end of the microwave measurement line 10, the crystal detector probe in the microwave measurement line 10 is moved along the axis direction of the waveguide, and the distribution state of the electric field intensity in the waveguide along the axis direction can be detected by combining the indication of the first frequency-selecting amplifier 8 connected with the probe, so that the waveguide wavelength can be measured, and the crystal detector in the microwave measurement line 10 can be calibrated.

When a standing wave ratio measurement experiment is carried out, the power probe 11 or the matched load 13 is configured at the tail end of the microwave measurement line 10 and used for changing the standing wave ratio in a microwave cavity, the crystal detector probe in the microwave measurement line 10 is moved, and the maximum point and the minimum point of a standing wave electric field are found and measured in combination with the indication of the first frequency selection amplifier 8, so that the standing wave ratio when the power probe 11 or the matched load 13 is configured can be obtained.

When the microwave power measurement experiment and the attenuation measurement experiment are carried out, the power probe 11 is arranged at the tail end of the microwave measurement line 10, the power indicator 12 is connected with the power probe 11, and the indication change of the power indicator 12 can be observed and recorded while the variable attenuator 9 is adjusted.

Claims

1. A multifunctional microwave measurement experimental device is characterized by comprising a microwave signal source, a waveguide coaxial converter, an E-H plane tuner, a directional coupler, an H plane curved waveguide, a microwave frequency meter, a crystal detector, a variable attenuator, a microwave measuring line, a first frequency-selecting amplifier and a second frequency-selecting amplifier; the microwave signal source, the waveguide coaxial converter and the E-H plane tuner are sequentially connected and then connected with the input end of the directional coupler, and the output end of the directional coupler is sequentially connected with the variable attenuator, the microwave measuring line and the first frequency-selective amplifier; the coupling end of the directional coupler is sequentially connected with the microwave frequency meter, the crystal detector and the second frequency-selecting amplifier through the H-face bent waveguide.

2. The multifunctional microwave measurement experiment device according to claim 1, further comprising a short-circuit board, wherein the short-circuit board is connected with the end of the microwave measurement line.

3. The multifunctional microwave measurement experimental device according to the claim 2, characterized in that the short-circuit board is replaced by a power probe or a matching load, and the power probe or the matching load is directly connected with the end of the microwave measurement line.

4. The multifunctional microwave measurement experiment device according to claim 1, further comprising a power probe and a power indicator, wherein the tail end of the microwave measurement line is sequentially connected with the power probe and the power indicator.