Testing device and method for near-field wave-absorbing material reflectivity

Abstract

The invention discloses a testing device for near-field wave-absorbing material reflectivity. The device comprises a vector network analyzer which is connected with a coaxial flange clamp through a coaxial cable, the coaxial flange clamp is arranged on a support, a division board is arranged on the top of the coaxial flange clamp, and a sample placing part is arranged between the division board and the coaxial flange clamp. The invention further discloses a testing method of the testing device for the near-field wave-absorbing material reflectivity. The testing device for the near-field wave-absorbing material reflectivity has the advantages that the structure is simple, the manufacturing cost is low, low-frequency range (30 MHz-3 GHz) measurement can be achieved, operation is easy and convenient, the accuracy degree is high, and the repeatability is good.

Description

technical field [0001] The invention relates to material testing technology, in particular to a test device and a test method for the reflectivity of near-field wave-absorbing materials. Background technique [0002] Absorbing materials are a class of functional materials that can convert electromagnetic energy into heat or other forms of energy. They were first used in the military field, such as stealth fighters and stealth equipment. In recent years, with the rapid development of electronic information technology, electronic products are developing in the direction of miniaturization, integration and functionalization, and the problems of electromagnetic interference and electromagnetic radiation pollution are becoming more and more prominent. Civilian microwave-absorbing materials (such as sheets and films) can solve the above problems to a certain extent, and the market demand is increasing. [0003] Absorbing materials have important applications in both military and ...

AI Technical Summary

Problems solved by technology

However, the bow method also has its own shortcomings and limitations: 1. The bow method test is a kind of free space method. In order to avoid the interference of external electromagnetic waves on the test, it needs to be tested in a standard microwave anechoic chamber. Place a large number of absorbing materials to eliminate external electromagnetic waves

Therefore, the bow method test requires a higher cost

2. The angle between the transmitting antenna and the receiving antenna and the sample surface is theoretically required to be the same, but in the actual test process, it is difficult to locate accurately, which eventually leads to large measurement errors

3. The bow method is mainly used to test the performance of far-field radar absorbing materials, which is more suitable for the military industry, such as testing stealth coatings, structural stealth materials, etc., while for near-field absorbing materials (such as absorbing materials used in electronic equipment Thin sheet material) is not suitable, mainly because such materials are usually attached to the surface of components, and the use environment is quite different from the test conditions of the bow method

In the actual test process, due to the limitation of the site and cost, it is difficult for the microwave anechoic chamber to be very large.

Generally, the test frequency of the bow method is above 1GHz, and it is usually impossible to test the reflectivity of materials in the frequency band below 1GHz.

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