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Abstract-An efficient approach called general sparse matrix canonical grid (G-SMCG) method is proposed to analyze the electromagnetic scattering from 2-D dielectric rough surface with a conducting object partially buried. In this paper, the scattering of 3-D arbitrarily shaped object is computed by using the traditional method of moments (MoM) with RWG basis function, and the scattering of rough surface is analyzed by using the SMCG method. The coupling interactions between an object and rough surface are calculated by iterative method. Combing the ocean rough surface with Pierson Moskowitz (PM) spectrum, the bistatic scattering coefficients of typical objects buried in the ocean surface have been computed by using the proposed method. Then the accuracy and efficiency of this method are discussed. Finally, the bistatic scattering coefficients of a ship located on ocean surface are calculated, and the influence of sea state and wind direction on the scattering coefficients is indicated.

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Lots of substrate integrated waveguide (SIW) slot antennas appear to satisfy the extensive and intensive growth of wireless communication systems. However, there were few reports about edge‐radiating slot antenna based on SIW technology. In this study, a half‐mode SIW (HMSIW) edge‐radiating slot antenna is proposed for the first time by etching transversal slots both on the upper and lower surfaces of HMSIW. The radiation field of this antenna has been deduced from the field distribution of HMSIW. A 6‐slot‐pair antenna worked at 3.0 GHz with gain of 5.8 dBi is obtained by regulating the size and the number of slots. Through setting matching posts and a terminal load, the bandwidth can be expanded from 2 to 9.7%. The measured results show that the matching‐type antenna has radiation efficiency about 0.59, beam directions ranging from 0° to 53° and gains within 5.0–7.5 dBi in 3.05–3.35 GHz. This antenna has advantages of low profile, easy fabrication, wide bandwidth and frequency‐scanning property, which are great for microwave radar applications.