The FYS3000 three centimeter waveguide testing system is the successor of our companyFYSBD20Later launched RF/The microwave experimental system is a three centimeter waveguide experimental system.

As is well known, RF/Microwave transmission lines can be divided into two categories according to their working wave types;

One type isTEMThe main feature of a wave transmission line is that there is no field strength component along the transmission direction, the phase velocity is a constant, independent of the operating wavelength, and there is no critical wavelength limitation. Any wavelength can be transmitted. There are coaxial lines, microstrip lines, and striplines that belong to this category.

The other type is dispersion wave transmission line, which is mainly characterized by a field strength component along the transmission direction. Generally speaking, this type of transmission line has a critical wavelength. If the operating wavelength is greater than the critical wavelength, the radio wave cannot be transmitted. This category includes rectangular waveguides, circular waveguides, and other commonly used rectangular waveguides with basic structural dimensions ofa×bA rectangular cross-section with a length generally greater than a few wavelengths.

The cross-sectional geometric dimensions of a rectangular waveguide are determined by the operating wavelength, and the wave mode transmitted by the rectangular waveguide isTE10Wave, a dispersive wave transmitted within a waveguide, with a waveguide wavelength longer than that of a free space waveλg＝λ/[1-(λ/2a)² ]^1/2.

The principle for selecting the size of rectangular waveguide is: only the main mode transmission; Having sufficient power capacity; Low loss; Usually taken as:

a=0.7 λ，b=a/2.

Three centimetersThe national standard for waveguides is:JB-100The flange standard is:FJB-100.

a=22.86mm b=10.16mm wall thicknesst=1.0mm

Working frequency:8.2-12.4GHzCut off frequency:six point five five seven

GHz

Product features:At present, there are many manufacturers in China that produce three centimeter waveguide testing systems. The three centimeter microwave experimental systems of these factories have similar structural forms and technologies. Our company has also produced them in the past, and the FYS3000 three centimeter waveguide testing system

1. Completely changing the previous design ideas and packaging methods, its main features are as follows:The frequency meter adopts an absorption resonant cavity,QHigh value, good feel, high precision

2. ;Variable attenuator adopts direct reading type, reliable and convenient

3. ;.The measurement line adopts waveguide.Sliding structure without tuning mechanism,Sliding distance>60mm

4.;.

Portable packaging

The FYS3000 three centimeter waveguide testing system is suitable for use in universities, research institutions, microwave communication, radar stations, etc. It has the characteristics of compact structure, complete equipment, and high cost-effectiveness.

Main technical performance of the product:The FYS3000 three centimeter waveguide testing system (microwave experimental system) includes: microwave signal source, frequency meter, power meter, frequency selective amplifier, variable attenuator, fixed attenuator, directional coupler, magicTHorn antenna, measuring line, sliding screw tuner, crystal detector, matching load, waveguide/.Coaxial converter, short-circuit board, reflector board, straight waveguide, etcIts main technical performance（Refer to the technical manual

）

Experimental content:Experiment 1Modulator and Crystal Detector Experiment（... 16

Master the basic theory and operation of crystal detectorsExperiment 2Experiments on propagation types, wavelengths, and phase velocities within waveguides（Learn waveguide theory，Learning microwave propagation characteristics in free space and waveguide through experiments... 20

）Experiment 3:QValue harmonious resonant cavityThe bandwidth experiment（Learn the theory of resonant cavity，Learn through experimentsQThe relationship between value and bandwidth, learning how to measure the resonant cavityQ... 26

value）Experiment 4Power Measurement Experiment（Learn different methods for measuring power，... 31

Learn how to estimate the accuracy of power measurement）Experiment 5Standing wave measurement experiment（Learn how to use slotted measuring lines orSWR_{Table measurement}SWR... 36

X）Experiment 6:Impedance measurement experiment（studySmith... 40

Circular diagram and its application in unknown impedance）Experiment 7:Basic characteristic experiment of directional coupler（... 45

Learn the basic characteristics of directional couplers, including coupling coefficients and directionality）Experiment 8:Attenuation measurement experiment（... 49

Learn attenuation measurement techniques for microwave devices）Experiment 9:Mo-TResearch experiment on waveguide（Understand the demon-TThe basic principle of，Learning Magic-T... 52

Measurement methods for the characteristics of）

1.3cm

2.Standard configuration of waveguide testing system: (Specific configuration for ordering can be selected according to needs)

3.Microwave signal source

4.Microwave power meter