Research On Testing Technology Of Microwave Dielectric Materials Based On DSP

Based on the complex permittivity testing technology of materials,this paper summarized the advantages and shortcomings of each model by analyzing the existing various material testing methods,and determined the electromagnetic parameter testing technology of microwave materials using coaxial open cavity as the main body.Then,based on the specific testing principle,this paper made a detailed analysis of the specific field distribution and resonance parameters of the cavity.What’s more,this paper estimated and improved the equivalent circuit model when the material is placed in the open port for testing based on the formula.Based on this equivalent model,the non-destructive testing method of single-layer materials were expounded,and the non-destructive testing method for electromagnetic parameters of biomass liquid were proposed through promotion and improvement.In addition,this paper combined microwave parameters with support vector machines to solve the problem of non-destructive testing of ultra-thin materials through functional training.Secondly,in order to meet the specific testing conditions in the subject,this paper designed the appropriate coaxial open cavity components and its size parameters,and also simulated and analyzed the cavity using HFSS software.What’s more,this paper implemented the corresponding Combination and packaging.In addition,this paper abandoned the dependence of the traditional testing method on the PC,used the DSP chip to connect with the sweeper,and controlled by touching the display screen to realize the measurement of the complex permittivity for single-layer materials,biomass liquids and ultra-thin materials.Then,the DSP chip,the frequency sweeper and the display screen were integrated and packaged,which fully demonstrated the advantages of small size,low cost,convenience and the speed of calculation,which made the whole testing system more convenient.Finally,based on the prepared testing system,the testing models of single-layer materials,biomass liquids and ultra-thin materials were debugged and calibrated,and then the actual measurements were made and the testing results were given.In addition,the experiment also compared the testing results,conducted an error analysis to ensure that the testing system can meet the following testing indicators:Temperature:25℃Frequency:0.3GHz-4GHzMeasure range:εr’:1～7;tan δ:1×10-3～5×10-2Test error:|Δεr’/εr’|≤5.0%|Δtanδ|≤10%×tanδ+8×10-4...