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Measuring method for reflectivity of microwave absorption material

A technology of microwave absorbing materials and measurement methods, which is applied in the direction of material analysis, measurement devices, and analysis materials using microwave means. It can solve the problems of large size, expensive, and difficult to ensure the flatness of the measurement surface, so as to achieve simple operation and avoid errors. , the effect of low measurement requirements

Inactive Publication Date: 2006-06-28
NANJING UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0026] Among the above-mentioned methods, the size of the sample to be measured is relatively large (the sample is at least 180mm×180mm×d, and d is the thickness); when measuring with the above-mentioned method, the requirements for the test environment are relatively high, and a microwave anechoic room is usually required to lay microwave-absorbing materials; More expensive test accessories are required, such as horn antennas, etc.; and when measuring with the above method, the absorbing material must be prepared into a large-area flat plate, and it is difficult to achieve uniformity in thickness when making a large-area flat absorbing material. It is also difficult to guarantee its flatness, and these will lead to a large error between the measurement results and the theoretical value. The above conditions limit many researchers to accurately test the reflectivity of absorbing materials.

Method used

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  • Measuring method for reflectivity of microwave absorption material
  • Measuring method for reflectivity of microwave absorption material
  • Measuring method for reflectivity of microwave absorption material

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Select HP8722ET vector network analyzer 6, APC-7mm coaxial air line 2, test cable 1 and APC-7 adapter 5 to test the reflectivity of the silicone rubber absorbing material containing 80% ferrite.

[0062] Choose HP8722ET network analyzer 6 and APC-7mm coaxial air line 2, and make the absorbing material into a concentric annular sample 3 with an outer diameter of 7mm, an inner diameter of 3.04mm, and a thickness of 3mm, so that it is compatible with the APC-7mm coaxial air line 2 are used in conjunction with each other, and ensure that the dimensional error of the inner and outer diameter of the sample, concentricity, perpendicularity between the end face and the axis, and the flatness of the end face are less than 0.05mm. Its measurement diagram is shown in figure 1 . Assemble the above test cable 1, adapter 5 and network analyzer 6 to determine the measurement parameters. The measurement parameters mainly include start frequency: 2GHz, stop frequency: 18GHz, number of ...

Embodiment 2

[0064] Select HP8757 scalar network analyzer 6, APC-3.5mm coaxial air line 2, test cable 1 and APC-3.5 conversion connector 5 to test the reflectivity of SiC ceramic absorbing material, and first make the absorbing material into an outer diameter 3.5mm, 1.52mm inner diameter, 15mm thick concentric annular sample 3, make it used in conjunction with APC-3.5mm coaxial air line 2, and ensure the size error of the inner and outer diameter of the sample, concentricity, perpendicularity between the end face and the axis And the flatness of the end face is less than 0.05mm.

[0065] Assemble the above-mentioned test cable 1, adapter 5 and network analyzer 6 to determine the measurement parameters. The measurement parameters mainly include start frequency: 2GHz, stop frequency: 18GHz, number of measurement points: 201, intermediate frequency bandwidth: 500Hz, output power: 0dBm and the average factor: 50, and measure and calibrate the test system composed of the three; assemble the cal...

Embodiment 3

[0067] The microwave absorbing material prepared with 60% nano-iron powder and epoxy resin was made into a concentric annular sample 3 with an outer diameter of 7mm, an inner diameter of 3.04mm, and a thickness of 3.2mm. The axial air line 2, the metal short circuit 4, the test cable 1 and the APC-7 type conversion joint 5 measure the reflectivity of the concentric annular sample 3, the measurement method is as in Example 1, and the measurement parameters mainly include the starting frequency: 8GHz, Termination frequency: 18GHz, number of measurement points: 201, intermediate frequency bandwidth: 300Hz, output power: 0dBm and average factor: 60, and then prepare a 180×180×3.2mm flat plate containing 60% nano-iron powder and epoxy resin to The bow method introduced in literature [2, 5] is used for measurement; then the reflectance value of the sample is calculated by the theoretical formula in literature [8], and the reflectance values ​​obtained by the above three methods are d...

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Abstract

A method for measuring reflectivity of microwave absorption material applies network analyzer being set with test cable, switching over connector, coaxial air line and metal short circuit as well as being able to directly measure s parameter of microwave component as measuring system to carry out reflectivity measurement on microwave absorption material sample of concentric ring form in matching to size of coaxial air line.

Description

technical field [0001] The invention relates to the research fields of microwave absorbing materials and electromagnetic shielding materials, and discloses a simple method for measuring the reflectivity of microwave absorbing materials. Background technique [0002] Radar Absorbing Material (Radar Absorbing Material, RAM) can effectively attenuate electromagnetic wave energy, eliminate or weaken electromagnetic interference and reduce the radar cross section of various targets, so it plays an important role in stealth technology. In the process of researching and applying wave-absorbing materials, it is necessary to understand the wave-absorbing properties of wave-absorbing materials. The parameter that characterizes the application characteristics of wave-absorbing materials is the reflectivity of materials to electromagnetic waves. Accurate and convenient measurement of the reflectivity of wave-absorbing materials is very important. Extra important. The measurement of the...

Claims

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Application Information

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IPC IPC(8): G01N22/00G06F19/00
Inventor 冯永宝丘泰沈春英李晓云杨建
Owner NANJING UNIV OF TECH
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