Wave-absorbing material reflection measuring device and method

Abstract

The invention provides a wave-absorbing material reflection measuring device. The wave-absorbing material reflection measuring device comprises a transmitting antenna, a receiving antenna, an arched frame, a time-domain pulse generator, a time-domain pulse receiver and a good conductor board, wherein the receiving antenna and the transmitting antenna are symmetrically placed on the arched frame; positions and actinal surface normal directions of the transmitting antenna and the receiving antenna are adjustable; the time-domain pulse generator generates a time-domain pulse to excite the transmitting antenna; the time-domain pulse receiver receives a time-domain signal; a wave-absorbing material is laid on the surface, facing the transmitting antenna and the receiving antenna, of the good conductor board to obtain a wave-absorbing material board. A wave-absorbing material reflection measuring method comprises the following steps: enabling included angles between the actinal surface normals of the receiving antenna and the transmitting antenna and the normal of the measured wave-absorbing material board to be equal; transmitting the time-domain pulse signal, and receiving a time-domain received signal waveform; selecting a time-domain reflected signal of the measured wave-absorbing material by using a time window, and performing time domain and frequency domain processing to obtain a frequency-domain reflected waveform of the wave-absorbing material. Through the wave-absorbing material reflection measuring device and the wave-absorbing material reflection measuring method, a test error caused by time domain-frequency domain conversion is reduced.

Description

technical field [0001] The present application relates to the field of electromagnetic field technology, and in particular to a device and method for measuring wave-absorbing materials. Background technique [0002] In recent years, with the rapid development of electromagnetic compatibility measurement technology and antenna measurement technology, the demand for electromagnetic compatibility anechoic chamber and antenna measurement anechoic chamber is increasing. In order to reduce the multi-path reflection in the EMC measurement and antenna measurement process, radio frequency absorbing materials are pasted on the inner wall and ceiling of the EMC anechoic chamber and antenna anechoic chamber or on all the walls. The radio frequency absorbing material can absorb and attenuate the radio frequency electromagnetic wave projected on its surface, and convert its electromagnetic energy into heat energy to dissipate or make the electromagnetic wave disappear due to interference....

AI Technical Summary

Problems solved by technology

In the data processing process, it is necessary to collect enough frequency points in the frequency domain scanning process to obtain accurate time domain information. At the same time, there will be transformation truncation errors during the two time-frequency transformation processes, which will affect the radio frequency absorption. The measurement results of the reflectance of the material have an impact on the

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