Study On The Dielectric Property Of Sea Clutter Simulation Materials

With the fast development of technology, all kinds of materials come into existence. As for the materials used in microwave and millimeter wave, the propagation characteristics of electromagnetic wave are mainly determined by them. Besides, radar functioning over the sea often detects targets under the influence of sea clutter. Hence, It is essential to study the dielectric properties of sea clutter simulation materials.In the paper, firstly both domestic and overseas dielectric property measuring techniques are discussed, from in X band to W band with the rise of EM wave frequency, including waveguide reflection/transmission methods, NRW T/R, resonant cavity method, free space measurement, open resonator measurement, and other overseas advanced measurements.Secondly, based on the measurement requirements and analysis of this kind of material, this paper proposes different methods in three various bands to conduct the measurement. Meanwhile, the data processing of the original rectangular waveguide method is improved during the measurement.Thirdly, the paper proposes novel approach based on the rectangular waveguide system—input impedance method, and provides new data processing method based on numeric computation. At last of this chapter, analysis on error of this method is provided, and 6 aspects to be noticed are offered. We can find that this new method eliminates many errors and simplifies the measurement and date processing. Meanwhile it extends the frequency range of rectangular waveguide application.Fourthly, this paper confirms the accuracy of the input impedance method by using the two methods based on the cylindrical resonant cavity, and the analysis of these two methods is provided.Last, the measurement conducted in W band is discussed, which offers information of the measurement system for this frequency band.