Spatial leakage cancellation and ku-band FMCW radar

Abstract

In the chapter 1, Spatial leakage cancellation technique is applied to the CW doppler radar system. The CW doppler radar have a problem of leakage signal reflected by the stationary bodies and by mutual coupling between the antenna. The principle of spatial leakage cancellation is based on the destructive interference. Using two frequencies(11.7GHz and 14GHz) makes the leakage signal of receiver system decrease by combining the spatial leakage signals. The experimental results show that the proposed spatial leakage cancellation technique enhances the isolation between doppler signal and leakage signal.In the chapter 2, Ku-Band FMCW radar is designed for low altitude target detection. The proposed radar system uses AD9854 to solve the problems of non-linearities, Auto-Gain-Control(AGC) is applied to the proposed radar system to obtain the high sensitivity, and also By using the signal processing of arctangent demodulation, the radar resolution of the proposed radar is improved.Wireless communication is one of the communication method most important marine environment. In the chapter 3, experimental study of propagation characteristic is carried out for maritime wireless communication. Through this study, we consider multipath fading phenomenon generated by the neighboring island and sea and propagation curves from measured data are compared with curves using data available in ITU-R p.1543-3The properties of carbon nanotube have been studied in various fields. In the chapter4, we analyzed the characteristics of the case to be used as an antenna by using carbon nanotube. Unlike using approximation kernel function in existing paper, exact kernel function is used to analysis accurate impedance characteristics of carbon nanotube antenna. The results of numerical simulation shows the resonance frequency of the carbon nanobute dipole antenna is very high(100GHz more).