The comparison of frequency domain method and time domain method in absorber reflectivity measurement

In this paper, it is presented that the reflectivity measurement comparison of the same absorber sample in frequency domain method and time domain method. In the frequency domain measurement, the arch method is used to measure the reflection signal of absorber sample and metal plate with the same dimension. The time-gate function of a Vector Network Analyzer(VNA) is needed for data processing. In the time domain measurement, a short pulse signal is used to separate the absorber reflection signal in accordance with the different arrival time. A reference reflection signal measurement method is proposed according to the principle of specular reflection other than metal plate reflection in this paper. Based on the measurement results comparison of the same sample in both methods, it can be seen that this time domain measurement method is feasible. However, it still needs be studied further in the future research.

[1]  Peter Russer,et al.  A time-domain system for the measurement of non-stationary EMI up to 40 GHz , 2012, 2012 Asia-Pacific Symposium on Electromagnetic Compatibility.

[2]  M. A. Alves,et al.  Electromagnetic radiation absorbing paints based on carbonyl iron and polyaniline , 2009, 2009 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC).

[3]  B. Levitas,et al.  UWB time domain system for RCS measurements , 2012, 2012 13th International Radar Symposium.

[4]  Evaluation method of absorber reflectivity using antenna with high reflection coefficient , 2012, ISAPE2012.

[5]  Bruce Archambeault,et al.  One-port time domain measurement technique for quality factor estimation of loaded and unloaded cavities , 2013, 2013 IEEE International Symposium on Electromagnetic Compatibility.

[6]  Hilbert Spectrum for Time-Domain Measurement Data and Its Application , 2003 .

[7]  Brian E. Fischer,et al.  Recent Microwave Absorber Wall- Reflectivity Measurement Methods , 2008 .

[8]  M. Marchetti,et al.  Modeling of microwave absorbing structure using winning particle optimization applied on electrically conductive nanostructured composite material , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[9]  K. Hatakeyama,et al.  Reflectivity measurements in anechoic chambers in the microwave to millimeter range , 2005, IEEE Transactions on Electromagnetic Compatibility.